Procedure for refining wastes of zinc from impurities and furnace for implementation of this procedure |
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IPC classes for russian patent Procedure for refining wastes of zinc from impurities and furnace for implementation of this procedure (RU 2436854):
   
Procedure for thermal treatment of solid domestic and industrial waste / 2424334
Wastes are treated in Vanyukov's furnace with slag melting, supplying charge and oxygen containing gas through tuyeres into slag melting. Charge is melted and slag is generated at temperature 1250-1400°C. The procedure is implemented in the furnace wherein height of tuyeres can be changed. With growth of the lowest working heat-producing capacity of charge height of axis of tuyeres arrangement from a bottom of the furnace is increased. Value of ratio of blast of oxygen containing gas (nm3/hour per 1 m2 of cross section of a furnace) and the lowest working heat-producing capacity of charge (kJ/kg) is maintained within the ranges of 0.07-0.12 facilitating degree of carbon burning-out in charge to its residual content in slag at the level of 0.1-0.15%.
 Process furnace or similar equipment / 2421544
Furnace has an outer cover, a reaction chamber inside the cover, a heating system and a system for circulating the reagent gas. The outer cover of the furnace and the reaction chamber bound a first volume between the inner side of the cover of the furnace and the outer side of the reaction chamber and a second volume inside the reaction chamber. The first volume is divided into a first part which forms the heating zone which accommodates the heating system and a second part in which the reagent gas is present. The heating zone is hermetically insulated from the second part. The furnace also has a system for circulating inert gas which is made and placed with possibility of feeding inert gas into the heating zone at a rate which provides positive differential pressure relative the pressure of the reagent gas inside the second part of the first volume in which the reagent gas is present in order to prevent passage of the reagent gas into the heating zone.
 Device for metal-thermal reduction of pulp of galvanic production / 2419659
Device consists of cylinder case with cover equipped with internal refractory coating. Also, inside the case there is installed a graphite crucible in form of truncated cone facing the bottom with smaller base. An orifice in the base is closed with a pusher. Further, the device consists of a striking appliance. The device is equipped with a located in the cover branch for exhaust of volatile products of metal thermal reaction from a working reservoir into a neutralising installation and with a branch for blasting with compressed air.
 Caisson of pyrometallurgical aggregate of bubble type / 2409795
Caisson consists of plate out of heat conducting material with imbedded into it coil, and of connecting pipes for input and output of coolant. Ratio of total area of the coil of the caisson calculated by its external diametre (F1, m2) to area of the caisson (F2, m2) from flame side is F1: F2-0.90-2.2. The caisson can be made with an orifice for insertion of air tuyere into it.
 Furnace for smelting materials containing non-ferrous and ferrous materials and high-melting formations in liquid bath / 2401964
Furnace consists of caisson shaft divided with cross partition into melting and reducing chambers equipped with low and upper tuyeres, of sole, of siphon for accumulation and tapping metal and slag via corresponding channels with orifice in lower part of end wall, of device for loading charge and solid materials into melting and reducing chambers and of pipe for fume extraction. The siphon is equipped with at least one bushing for insertion and transfer of an electrode in it, with a block for electrode manipulation, with a power source, and with a block of control-measuring facilities and automation. Also an upper part of the electrode is connected to the power source and to the block of control and measuring facilities and automation; the output of the latter is coupled with an input of the manipulation block ensuring vertical reciprocal motion of the electrode via its drive and its deviation from vertical axis.
 Furnace for continuous refining of magnesium / 2400685
Furnace consists of lined jacket with electrodes, and of bell installed inside with charge chamber and central vertical channel, with vertical webbing, overflow channels and bottom between two of ribs and two branches with removable funnels. An orifice of diameter bigger, than diameter of a charging branch and of cross section less, than cross section of the overflow channels in vertical ribs near the charging branch is made in the bottom under the charging branch. The removable charging funnel is ended with a cup-like guide of flow at depth of 0.1-0.5 of height of the bell from its top. Also diameter of the guide is 30-80 mm bigger, than diameter of the end of the charging funnel. Working electrolyte of electrolytic cells is used as heating salt.
 Melting furnace / 2399003
Furnace consists of case with installed therein melting section equipped with facility for charge supply and burner and electro-thermal section divided from melting section with partition not reaching hearth; also melting section is equipped with electrodes, electric holders, devices for metal and slag tapping and with gas duct. A lower edge of the partition is positioned above the level of the slag tapping device thereby forming a gas-overflow port of alternate cross section with the level of melt. The metal tapping device is equipped with a well communicated with an overflow zone of the partition via a channel. Section of the port is chosen according to specified ratio of furnace width to inter-axis distance between electrodes. The charge supply facility has a chute superposed on a stepped hearth with incline to a partition side.
 Procedure for refinement of zinc containing raw material from impurity metal oxides and impurity metals; furnace for implementation of this procedure / 2389809
Procedure consists in charging zinc containing raw material together with additive of metal aluminium at amount of 0.02-0.05 % of weight of zinc containing raw material into stand of salts melt of composition wt %: NaCl - 56-59, NaF - 22-23, KCl - 11, Na2B4O7 - 4-6, B2O3 - 3-5 at temperature 600-700°C. The furnace consists of a shell made out of refractory steel. A ceramic branch is used for draining refined melt of zinc into pans. The ceramic branch is also used for emptying the furnace of zinc and salts melt during maintenance repairs and emergencies. The bottom of the furnace is lined with refractory non-metallic materials. The shell of a crucible on internal surface is also lined with refractory non-metallic materials at height from the bottom of the furnace up to 500-600 mm; a layer of refractory glue is applied at the joint point of refractory non-metallic lining with internal surface of the shell.
 Duplex-furnace for smelting of manganese alloys from ferrimanganese bases and concentrates and anthropogenic wastes of metallurgy / 2380633
In arch of siphon there are implemented openings or windows for loading of carbon-bearing materials, partition with bottom window or windows for flow of melted slag into siphon is implemented in the form of common end wall for liquid-phase smelting shaft and siphon with electrode(s) and allows window or windows for fume extraction from under arch of siphon, located on level not higher than horizontal axis of top row of tuyeres of liquid-phase smelting shaft, siphon is outfitted by solid transverse partition, installed in its bottom part parallel to common end wall for liquid-phase smelting shaft and siphon at a distance enough for flow of required volume of slag melt from liquid-phase smelting shaft on surface of heated layer of carbon-bearing material, herewith solid transverse partition fully separates siphon from liquid-phase smelting shaft, and its top edge is located higher than horizontal axis of bottom row of tuyeres of liquid-phase smelting shaft.
 Device for gas-thermal oxidation of objects made from titanium and titanium-containing alloys / 2369663
Invention relates to equipment for passivation of metal surfaces, more specifically to devices for gas-thermal oxidation of objects made from titanium and titanium-containing alloys. The device has an oxidation chamber, fitted with a cooling system and a heating system, a unit for feeding gaseous mixture into the oxidation chamber, a unit for outlet of gaseous mixture from the chamber, a chamber for cooling oxidised objects, which has a unit for flowing cooling inert gas medium in and out. The cooling chamber is joined to the oxidation chamber through a rotary valve, made with two hemispherical gates, which can open and close the opening in the rotary valve for joining or separating both chambers.
Procedure for refinement of zinc containing raw material from impurity metal oxides and impurity metals; furnace for implementation of this procedure / 2389809
Procedure consists in charging zinc containing raw material together with additive of metal aluminium at amount of 0.02-0.05 % of weight of zinc containing raw material into stand of salts melt of composition wt %: NaCl - 56-59, NaF - 22-23, KCl - 11, Na2B4O7 - 4-6, B2O3 - 3-5 at temperature 600-700°C. The furnace consists of a shell made out of refractory steel. A ceramic branch is used for draining refined melt of zinc into pans. The ceramic branch is also used for emptying the furnace of zinc and salts melt during maintenance repairs and emergencies. The bottom of the furnace is lined with refractory non-metallic materials. The shell of a crucible on internal surface is also lined with refractory non-metallic materials at height from the bottom of the furnace up to 500-600 mm; a layer of refractory glue is applied at the joint point of refractory non-metallic lining with internal surface of the shell.
 Purifying method of secondary zinc alloys / 2324750
Invention concerns an area of purifying methods of secondary zinc alloys, their procurement from the auxiliary raw materials, and can be used in metallurgy and mechanical engineering. The method of purifying of the secondary zinc alloys includes processing of an alloy combination with intensifying agent which, when coming into contact with the zinc residual elements, begin to form churlish, heat-resistant phases, and segregate the infusible compounds. Interaction with these intensifying agents and segregation of the infusible phases is carried out by means of passing the molten mass through a foam-ceramic filter with an active ultra dispersal cover obtained as a result of chemical sedimentation of connection between a number of elements belonging to the II-IV Group of the Mendeleev periodic system, coupled with the thermal processing performed under the 1000-1200°C range of temperatures. The technical achievements of this invention result in removal of non-metallic inclusions, increases in consistency of distribution and reductions in composition of led and iron.
 Method of purification of zinc from oxides of foreign metals and furnace for realization of this method / 2261925
Proposed method includes loading zinc into cages in sodium tetraborate melt containing 3-7 mass-% of boric acid anhydride at temperature of 750-800°C. Furnace used for purification of zinc is provided with pot for melt for avoidance of pouring of sodium tetraborate melt. Said pot is provided with branch pipe for pouring purified zinc melt into ingot molds. Proposed method may be performed in continuous mode. Production of zinc is increased not below 99.55%.
Method of purification of zinc from oxides of foreign metals and furnace for realization of this method / 2261925
Proposed method includes loading zinc into cages in sodium tetraborate melt containing 3-7 mass-% of boric acid anhydride at temperature of 750-800°C. Furnace used for purification of zinc is provided with pot for melt for avoidance of pouring of sodium tetraborate melt. Said pot is provided with branch pipe for pouring purified zinc melt into ingot molds. Proposed method may be performed in continuous mode. Production of zinc is increased not below 99.55%.
Purifying method of secondary zinc alloys / 2324750
Invention concerns an area of purifying methods of secondary zinc alloys, their procurement from the auxiliary raw materials, and can be used in metallurgy and mechanical engineering. The method of purifying of the secondary zinc alloys includes processing of an alloy combination with intensifying agent which, when coming into contact with the zinc residual elements, begin to form churlish, heat-resistant phases, and segregate the infusible compounds. Interaction with these intensifying agents and segregation of the infusible phases is carried out by means of passing the molten mass through a foam-ceramic filter with an active ultra dispersal cover obtained as a result of chemical sedimentation of connection between a number of elements belonging to the II-IV Group of the Mendeleev periodic system, coupled with the thermal processing performed under the 1000-1200°C range of temperatures. The technical achievements of this invention result in removal of non-metallic inclusions, increases in consistency of distribution and reductions in composition of led and iron.
Procedure for refinement of zinc containing raw material from impurity metal oxides and impurity metals; furnace for implementation of this procedure / 2389809
Procedure consists in charging zinc containing raw material together with additive of metal aluminium at amount of 0.02-0.05 % of weight of zinc containing raw material into stand of salts melt of composition wt %: NaCl - 56-59, NaF - 22-23, KCl - 11, Na2B4O7 - 4-6, B2O3 - 3-5 at temperature 600-700°C. The furnace consists of a shell made out of refractory steel. A ceramic branch is used for draining refined melt of zinc into pans. The ceramic branch is also used for emptying the furnace of zinc and salts melt during maintenance repairs and emergencies. The bottom of the furnace is lined with refractory non-metallic materials. The shell of a crucible on internal surface is also lined with refractory non-metallic materials at height from the bottom of the furnace up to 500-600 mm; a layer of refractory glue is applied at the joint point of refractory non-metallic lining with internal surface of the shell.
 Procedure for refining wastes of zinc from impurities and furnace for implementation of this procedure / 2436854
Procedure consists in charging wastes of zinc into crucible of furnace, in their re-melting at temperature equal or higher, than temperature of melting at presence of anhydride of boric acid produced in furnace at thermal decomposition of boric acid. The distinguished feature of the procedure is charging boric acid on a bottom of the furnace crucible before charging wastes of zinc. Weight of boric acid is calculated by formula: y=25.1(100-x), where y is weight of boric acid per 1000 kg of zinc wastes, kg, x is content of metal zinc in wastes, %. When temperature of melt of zinc wastes reaches 700-750°C, it is conditioned in the furnace for 45 min. Also, height of melt of zinc wastes in the crucible of the furnace is maintained as 800 mm. The furnace consists of a case, of lining with refractory bricks, of the crucible for melting wastes of zinc laid with refractory bricks, of gas dead-end burners positioned in chambers and communicated with the crucible of the furnace through channels in mason-work of furnace crucible, of a cover of the furnace crucible, of two notches, one of which is located at height of 80 mm from the bottom of the furnace crucible designed for casting refined melt of zinc into moulds, while the second one is located at the level of the bottom of the furnace crucible and is designed for casting melt of zinc containing inter-metallic compounds or true solutions of impurity metals in melt of zinc into moulds.
 Furnace with inner heaters / 2246086
The melting cavity with heaters located in it, the heaters pass outside through the brickwork, where they are cooled for production of the conditions of melt crystallization inside the brickwork thus providing the furnace leak-proofness, the minimum thickness of the brickwork is determined by an empirical relation: dmin=a+b(Tf-Tmelt)/Tmeit+C[Theat/Tmelt-Theat)]2, where: dmin- the minimum wall thickness; Tf - the temperature of metal inside the furnace; Tmelt- the metal melting point; Theat- the temperature of the outside end faces of heaters; a, b, c - empirical coefficients equal to 10, 25 and 2,2 cm respectively.
Method of purification of zinc from oxides of foreign metals and furnace for realization of this method / 2261925
Proposed method includes loading zinc into cages in sodium tetraborate melt containing 3-7 mass-% of boric acid anhydride at temperature of 750-800°C. Furnace used for purification of zinc is provided with pot for melt for avoidance of pouring of sodium tetraborate melt. Said pot is provided with branch pipe for pouring purified zinc melt into ingot molds. Proposed method may be performed in continuous mode. Production of zinc is increased not below 99.55%.
 Method for pyrometallurgical processing of non-ferrous ores and concentrates for producing of matte or metal and flow line for performing the same / 2267545
Method involves melting with the use of oxygen-containing blast gas; converting; depleting slag in gasifier; reducing gases from melting process and converting with hot gases from gasifier. Oxygen-containing blast gas used is exhaust gas of energetic gas turbine unit operating on natural gas or gas generating gas from coal gasification. Gas used for gas turbine unit is gas generating gas from bath coal gasification produced on slag depletion. Flow line has melting bubbling furnace, converter, gasifier for slag depletion, gas turbine unit with system of gas discharge channel connected through branches with tuyeres of melting furnace, converter and gasifier. Each of said branches is equipped with pressure regulator and flow regulator.
 Device for refining magnesium and preparation of magnesium alloys / 2273673
Device refining magnesium and preparation of magnesium alloys includes furnace made in form of shaft with casing lined with heat-insulating and refractory layers, heaters, crucible with flange, bearing ring and cover; refractory layer consists of several detachable cylindrical blocks in height of furnace shaft interconnected by means of tenon-slot joints and provided with projection on outer side and slot on inner side. Detachable block is solid in form and is assembled from half-rings which are interconnected by means of slot-to-slot joints and are secured by mortar. Block is made from high-strength chemically and thermally stable refractory material, for example concrete claydite or fluorine phlogopipe. Heat-insulating layer is made from basalt slabs. Ratio of refractory and heat-insulating layers is equal to 1:1.5. Zigzag heaters are secured on refractory block over entire height of furnace shaft.
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FIELD: metallurgy. SUBSTANCE: procedure consists in charging wastes of zinc into crucible of furnace, in their re-melting at temperature equal or higher, than temperature of melting at presence of anhydride of boric acid produced in furnace at thermal decomposition of boric acid. The distinguished feature of the procedure is charging boric acid on a bottom of the furnace crucible before charging wastes of zinc. Weight of boric acid is calculated by formula: y=25.1(100-x), where y is weight of boric acid per 1000 kg of zinc wastes, kg, x is content of metal zinc in wastes, %. When temperature of melt of zinc wastes reaches 700-750°C, it is conditioned in the furnace for 45 min. Also, height of melt of zinc wastes in the crucible of the furnace is maintained as 800 mm. The furnace consists of a case, of lining with refractory bricks, of the crucible for melting wastes of zinc laid with refractory bricks, of gas dead-end burners positioned in chambers and communicated with the crucible of the furnace through channels in mason-work of furnace crucible, of a cover of the furnace crucible, of two notches, one of which is located at height of 80 mm from the bottom of the furnace crucible designed for casting refined melt of zinc into moulds, while the second one is located at the level of the bottom of the furnace crucible and is designed for casting melt of zinc containing inter-metallic compounds or true solutions of impurity metals in melt of zinc into moulds. EFFECT: reduced capital and operational expenditures. 5 cl, 1 dwg, 1 ex, 2 tbl
The present invention relates to the metallurgical industry and can be used for treatment of zinc, containing at least 90% of metal zinc get zinc, which can be used for hot-dip galvanizing steel, obtaining various alloys based on zinc, zinc white, zinc oxide, powdered zinc high quality. A method of obtaining zinc from zinc dross, selected as a prototype, including the loading of zinc dross in the furnace, the melt at a temperature of 700-800°C., holding at this temperature for 0.25 to 0.5 h, cooling the melt to a temperature of 460-500°C., holding at this temperature for 0.3 to 1.2 hours and then discharge the molten zinc molds (RF Patent 2188244, BI No. 24, 27.08.2002,, s). The disadvantages of this method are: - low yield of purified zinc used for galvanizing steel - 55%; - formation of nastys on the refractory lining of the furnace, which leads to frequent stops the operation of the furnace for carrying out cleaning. A known method of purification of zinc from oxide impurity metals and bake for implementing the method, including the melting of zinc in the molten sodium tetraborate containing 3-5 wt.% anhydride of boric acid, at a temperature of 700-800°C. Oven cleaning zinc includes vertically the plant and the crucible, which has a wall pocket, a nozzle for discharging the purified zinc, built-in pocket on the level of the height of the layer of gate from the molten zinc in the pocket, preventing draining of the salt melt from the crucible. The height of the layer of molten zinc in the shutter is determined by the formula h1=(h2·q1+h3·q2):q1, where h1- the height of the layer of molten zinc in the bolt, m; h2- the height of the layer of molten zinc at the bottom of the crucible; h3- the height of the layer of molten sodium tetraborate in a crucible furnace, m; q1- the specific gravity of molten zinc, t/m3; q2- the specific gravity of molten sodium tetraborates, t/m3 (Patent RF №2261925, 26.02.2004, BI No. 28, 10.10.2005,). The disadvantages of this method are: - high melt viscosity tetraborate sodium, which is a cause of significant outflow of melt from the crucible together with the cage; - high melting point tetraborate sodium, which will lead to heating of the molten zinc to the same temperature and increased evaporation of zinc (partial vapour pressure of zinc at a temperature of 788°C - 200 mm Hg). The tasks of the proposed method of waste treatment zinc from impurities and furnace for implementing the method are the elimination of the above disadvantages of the known methods and the reduction of capital and ek is operating costs. The solution to these problems is achieved as follows. In the crucible of the furnace first load of boric acid, the mass of which is calculated by the formula y=25,1(100-x), where is the mass of boric acid per 1000 kg of waste zinc, kg; x - the content of metallic zinc in the waste, %. Then in the crucible of the furnace download waste of zinc, the weight of which will allow to form in the crucible of the furnace the molten zinc height 800 mm After downloading boric acid and waste zinc in the crucible of his close lid, include in work dead-end of a gas burner mounted in cameras that have a message crucible furnace through existing masonry ovens channels. When reaching into the crucible furnace temperature of 400°C there is a thermal decomposition of boric acid anhydride of boric acid and water vapor according to the reaction scheme: 2 H3IN3=B2O3+3H2O At the bottom of the crucible is formed of a solid layer of anhydride of boric acid. When reaching into the crucible furnace temperature 419,5°C gradually begins to melt zinc and drops to flow down to the bottom of the crucible, at the same time filling the space of the chambers, where are the dead-end of a gas burner. Since then, the heat transfer to the molten zinc in the crucible of the furnace from the dead-end burners will be implemented through the liquid phase of molten zinc. The heat transfer cher the C liquid phase 30 times the heat transfer in the gas phase. This will lead to intense heating of the lower layers of molten zinc at the bottom of the furnace and the intensive melting of zinc in the waste immersed in the molten zinc. When reaching the molten zinc at the bottom of the crucible furnace temperature of 577°C will melt the anhydride of boric acid. Due to the high viscosity of the melt anhydride of boric acid, exceeding several times the viscosity of the molten zinc, and also significantly lower specific gravity melt anhydride of boric acid (1,844 g/cm3compared with molten zinc (6,92 g/cm3) melt the anhydride of boric acid will rise. When lifting melt anhydride of boric acid in the environment of the molten zinc will be the reaction of the anhydride of boric acid with oxides of impurity metals contained in the molten zinc on the schemes of reactions: Fe2O3+3B2O3=2Fe(BO2)3 Al2O3+3B2O3=2Al(BO2)3 PbO+B2O3=Pb(BO2)2 etc. The specific gravity of the formed aggregates metabonomics salts of impurity metals is significantly lower specific mass of molten zinc and therefore these units together with the molten anhydride of boric acid will rise up in an environment of molten zinc. When the temperature in the furnace crucible 700-750°C will occur bulk melting waste of zinc in the crucible of the furnace. Melt the anhydride of boric acid will slowly float back to the surface of the molten zinc and translate all the impurities in the form of metal oxides in metabonomics salt impurity metals, which will also float to the surface of the molten zinc. The molten zinc maintained at a temperature of 700-750°C for 45 minutes to separate impurities: light (metabromine salt impurity metals) will float to the surface of the molten zinc, and the hard intermetallic compound (FexZny, CuxZnyetc) will settle to the bottom of the molten zinc. After settling of the molten zinc begins to reduce its temperature to 500-550°C. Upon reaching this temperature, the lid of the crucible is removed, metabromine salt impurity metals are removed with a ladle, made of metal mesh, and then start draining the purified zinc through a tap-hole located at a height of 80 mm from the bottom of the crucible furnace. Draining of molten zinc with the precipitation of intermetallic compounds or true solutions of impurity metals in zinc are carried out through a tap-hole, located at the bottom of the crucible furnace. The discharge of the melt locking inserts replace the exhaust sleeve with a hole. The molten zinc is fed to the filling machine with a rotary chute. The set of features of the proposed technical solution - cleaning method of the moves of zinc from impurities and bake for implementing the method are different from the prototype and not follow explicitly studied the prior art, therefore, the method and furnace for implementing the method are new and have an "inventive step". The method of purification of waste zinc from impurities and bake for implementing the method can reduce capital and operating costs, reduce and simplify manufacturing operations, improve environmental safety of the production process. Furnace for waste treatment zinc from the contaminants shown in the drawing. The furnace includes the following elements: - the casing of the furnace (POS.1); - furnace lining refractory brick (pos.2); camera stub for gas burners (3); - crucible furnace, lined with refractory bricks (pos.4); - the lid of the crucible furnace of heat-resistant steel with insulating liner (pos.5); - rings for strapping and removal or installation of the cover (pos.6); - channels in the walls of the crucible furnace for messages with cameras (pos.7); the lower years (pos.8); upper years (pos.9); the dead - end of a gas burner (10); - fitting for natural gas in the burner (pos.11); - fitting for air supply to the burner (pos.12); - fitting for removal of combustion products of natural gas from the burner (POS). The method of purification of waste zinc from impurities is carried out as follows. For implementing the method of waste treatment zinc from impurities is used furnace technicians who enoy design, shown in the drawing. The crucible furnace (pos.4) lined with refractory bricks. Over the entire height of the crucible is left channels (pos.7) for the flow of molten zinc in the chamber (3) and provide intensive heat transfer from a dead-end burners (10) to the downloaded waste of zinc in the crucible of the furnace. At the same time, the channels will help to eliminate the load on the internal wall of the crucible with molten zinc. The stub of a gas burner (10) is placed in the camera to avoid the possibility of breakage of the reflective pipes, which are made of silicon carbide CSi. To prevent evaporation of zinc from the crucible and heat loss when heated waste of zinc in the crucible install cover (5)made of refractory steel strip in the middle part of the refractory material, for example mineral wool. In the lower part of the crucible furnace is built entrances - top (position 9) for discharge of pure zinc, lower (pos.8) for discharge of zinc contaminated intermetallic compounds, such as FexZny, PbxZny, etc. or a true solution of the impurity metals in zinc. The crystal lattice of the intermetallic compounds are sealed, so the unit mass exceeds the specific gravity of zinc and contributes to their settling on the bottom of the furnace. Settling on the inner walls of the crucible furnace oxide impurity metals lawsuit is uchino, since the last interaction with boric anhydride form metabonomics salt, which as a result of adhesion to each other to form aggregates, and because of their much lower specific gravity compared to the molten zinc will float on the surface of the molten zinc. First, determine how much weight waste zinc you want to load into the oven, to melt the height was in the crucible of the furnace is not less than 800 mm, Determine the content of metallic zinc in the waste according to the formula given above, determine the mass of boric acid, which you want to load into the oven. Remove the cover from the crucible furnace using a crane. At the bottom of the crucible furnace load boric acid, then load the waste zinc. A cover mounted on the furnace crucible. Include in the work dead-end gas burners, install automatic maintenance in the crucible of the furnace temperature at the level of 700-750°C. Upon reaching this temperature the melt waste of zinc in the crucible furnace was incubated for 45 minutes. Then install automatic temperature in the crucible of the furnace at the level of 500-550°C. Upon reaching this temperature, remove the cover from the crucible furnace. Units metabonomics impurity salts of the metals removed from the surface of molten zinc the scoop of metal mesh. A cover mounted on the furnace crucible and begin draining the purified melt qi is ka tapped through the upper (80 mm from the bottom of the crucible furnace) in the mold, then drain the molten zinc contaminated intermetallic compounds of impurity metals, tapped through the bottom, located at the bottom of the crucible furnace, ingot moulds. After draining of molten zinc entrances lead in working condition for the next operation of waste treatment zinc from impurities. Data technological parameters are known (patent RF №2188244, BI No. 24, 27.08.2002,, S. 302) and the proposed methods of waste treatment zinc from impurities shown in table 1. Example. The waste composition of zinc, wt.%:
The results of the technological process of the proposed method of waste treatment zinc when specified in the formula parameters and boundary parameters are presented in table 2.
1. The method of purification of waste zinc from impurities, including loading of waste C the NCA in the crucible of the furnace, they melted at a temperature equal to or greater than the melting temperature in the presence of an anhydride of boric acid produced in the furnace by thermal decomposition of boric acid, wherein before loading into the furnace waste of zinc on the bottom of the crucible furnace load boric acid, the mass of which are calculated according to the formula 2. The method according to claim 1, characterized in that after cooling of the melt waste of zinc in the furnace the temperature of the molten zinc is reduced to 500-550°C, then remove from the surface of the molten zinc units metabonomics salts of impurity metals, cover the crucible with a lid and produce a flow of molten zinc in the moulds. 3. The method according to claim 1, characterized in that the discharge of molten zinc exercise at first through a tap-hole for draining molds purified molten zinc located on the bottom of the crucible furnace at a height of 80 mm, and then through a tap-hole for drainage in the mold of molten zinc containing intermetallic compounds or true solutions of impurity metals in molten zinc, located at the bottom tagspace. 4. Furnace for waste treatment zinc from impurities containing casing, a lining of refractory bricks, the crucible for melting waste zinc, lined with refractory bricks, gas burner, cover the crucible of the furnace, the tap hole, characterized in that the gas stub burner placed in chambers with a message crucible furnace through channels in the walls of the crucible. 5. Furnace according to claim 4, characterized in that the furnace has two entrances, one of which is located at a height of 80 mm from the bottom of the crucible and is designed to drain into the mold of the pure molten zinc, and the second years is at the level of the bottom of the crucible furnace and is designed to drain into the mold of molten zinc containing intermetallic compounds or true solutions of impurity metals in the molten zinc.
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