Method of making pellets from ores and concentrates of ferrous metals
SUBSTANCE: proposed method comprises mixing polydisperse ores of ferrous metals and/or concentrates of ferrous metal ores with binder and mix pelletising at pressure. Note here that said binder represents solution of carboxymethyl cellulose of 1-3 wt % concentration in amount sufficient to get mix with moisture content of 7-14% and with addition of bentonite in amount of 0.2-1% of polydisperse material weight. Obtained pellets are roasted at 900-1300°C.
EFFECT: simplified process, higher strength, water resistance and dilution.
2 cl, 4 ex
The invention relates to the preparation of metal-containing raw materials for metallurgical processing, in particular to the briquetting ores and concentrates of ferrous metal ores.
Known "Method of agglomeration of fine iron-bearing materials for refining organic binder (patent RU No. 2272848, publ. 27.03.2006), in which acycolivr shredded ferrous materials. As the iron-containing material used iron ore concentrate, iron ore, tailings, metallurgical production, crushed slag, and other fine iron-containing materials. At least one iron-containing material and a binder are mixed, carry out the aggregation of the mixture and hardening the obtained aggregates. The binder material used is a synthetic copolymer of acrylamide and sodium acrylate in which the mole fraction of sodium acrylate may be from 0.5 to 99.5%, a molecular weight in the range of 1·104up to 2·107. Dosage of synthetic copolymer of acrylamide and sodium acrylate is from 0.02 to 0.10 kg per tonne of iron-bearing material. Copolymer of acrylamide and sodium acrylate can be used in the form of powder, solution, emulsion, suspension, or aerosol, in pure form or mixed with additional material is.
The disadvantages of the method are the difficulty of obtaining koskovich materials and the relatively high cost of the resulting product.
Known "Method of producing briquettes from fine metal oxides" (patent RU №2198940, publ. 20.02.2003)in which to obtain briquettes for recovery heat treatment in a gas atmosphere to produce a mixture of metal oxides with an aqueous solution of liquid glass and hydrophobic liquid hydrocarbons with a boiling point above 300°C and subsequent pressing.
The disadvantages of the method are the complexity of its implementation, ore briquettes on the content of useful components.
Known "Method of producing briquettes (patent RU No. 2203334 published 27.04.2003)adopted for the prototype, including a mixture of fine-grained polydisperse material with liquid glass and briquetting the mixture under pressure, characterized in that the mixture is served hot fine polydisperse material and heated or not heated liquid glass, after mixing the mixture before briquetting stirred conditions that ensure the evaporation of moisture from the surface and cooling it to a predetermined temperature.
The disadvantages of the method lies in the sophisticated technology of their production, the relatively low strength of the briquettes and their resubordinate useful for the y component.
The technical result of the invention is the simplification of the manufacture of briquettes at higher strength, moisture resistance of the briquettes and reduce dilution by the metal briquette.
The technical result is achieved in that in the method for producing briquettes, comprising a mixture of polydisperse material with a binder, briquetting the mixture under pressure as polydisperse polydisperse material used ores of ferrous metals and/or concentrates of ferrous metal ores, and as the binder used solution of carboxymethyl cellulose with a concentration of 1-3 wt.% and in an amount to provide a mixture with a moisture content 7-14%, with the addition of bentonite in the amount of 0.2-1% by weight polydisperse material.
These briquettes can be calcined at a temperature of 900-1300°C.
Use as a binder solution of carboxymethyl cellulose with a concentration of 1-3 wt.% and in an amount to provide a mixture with a moisture content 7-14%, with the addition of bentonite in the amount of 0.2-1% by weight polydisperse material provides robust and little razboieni content of useful component (metal) briquettes. The use of carboxymethyl cellulose with a concentration of less than 1 wt.% leads to a decrease in the strength of the briquettes, the concentration above 3 wt.% does not increase the strength of the briquettes. STA is in bentonite less than 0.2% leads to a decrease in the strength of the briquette, the number of more than 1% does not increase the strength of the briquette, and the content of useful component in the briquettes is reduced.
Humidity briquetted mixture in the range of 7-14% promotes uniform mixing of all components, the formation of strong structural connections and the best of forming briquettes, which increases the strength of the briquettes. The moisture content of the mixture is less than 7% impedes mixing of the components of the mixture, the moisture content of the mixture over 14% of excess reduces the formability of the mixture, reduces the strength of the briquettes.
The burning of the briquettes at a temperature of 900-1300°C produces a very durable and moisture-resistant briquettes. Firing at a temperature less than 900°C can significantly increase the strength and resistance of the briquettes. Firing at a temperature of more than 1300°C does not improve the strength and water resistance of the briquettes.
The method is as follows. Destroyed polydisperse ores of ferrous metals and/or concentrates of ferrous metal ores mixed with bentonite in the amount of 0.2-1% by weight polydisperse material in a standard mixer, for example, a drum. The solution of carboxymethylcellulose receive, for example, in a paddle mixer. The resulting mixture was again mixed with a solution of carboxymethyl cellulose with a concentration of 1-3 wt.% and in an amount to provide a mixture with a moisture content of 7-14% in drum or teelichthalter. Next, the obtained mixture is formed on the roller press under the pressure of 40-45 MPa briquettes, which are then heated to remove moisture or calcined at a temperature of 900-1300°C.
Example 1. Briquettes were made from meticulou ore particle size -10+0mm, spanning a 1.2% solution of carboxymethyl cellulose and 0.2% bentonite. The average humidity of briquetted mixture of 8%, a pressure of 40.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 6.9 MPa.
Briquettes were made from meticulou ore particle size -10+0mm, spanning a 1.2% solution of carboxymethylcellulose and 0.6% of bentonite, the average humidity of briquetted mixture of 7.8%; the pressure of 41.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 7.7 MPa.
Briquettes were made from meticulou ore particle size -10+0mm; connecting a 1.2% solution of carboxymethyl cellulose and 1.0% bentonite; average humidity of briquetted mixture of 10.2%; the pressure of 41.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 9.4 MPa.
Briquettes were made from meticulou ore particle size -10+0mm; binder 2,3% solution of carboxymethyl cellulose and 0.5% bentonite; average moisture content of the briquette of 9.5%; the pressure of 41.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 9.5 MPa.
Example 2. Briquettes were made from extracted-GI is regenative ore (-10+0 mm). Binder 1.5% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 12.2%; the pressure of 40.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 11.1 MPa.
Briquettes were made from extracted-hydrogenative ore (-10+0 mm). Connecting a 3.0% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 10.0%; pressure 40,0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 11.2 MPa.
Example 3. Briquettes were made from extracted-hydrogenative ore (-10+0 mm). Binder 1.5% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 10.1%; the pressure of 41.0 MPa. Briquettes are burnt. When the firing temperature of 900°With the uniaxial compressive strength of 28.6 MPa, 1000°C - 34.8 MPa, 1100°C - 39,3 MPa, 1200°C - 43,9 MPa, 1300°C - 42,4 MPa. The briquettes are not destroyed after a one-night stay in the water.
Example 4. The briquettes were produced from chromite concentrate size -3+0 mm Binder 1,2% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 9.3%; the pressure 44.5 MPa. Thus obtained pellets with an average uniaxial compressive strength of 6.1 MPa.
The briquettes were produced from chromite concentrates size -3+0 mm Binder 1,2% solution of carboxymethyl cellulose is 0.6% of bentonite; the average humidity of briquetted mixture of 9.8%; the pressure to 44.8 MPa. Thus obtained pellets with an average uniaxial compressive strength of 7.2 MPa.
In the manufacture of briquettes from meticulou ore with iron content of 65 wt.%, ore metal (reduction of its content in the briquette) was as follows: when the amount of bentonite and 1% 0,65%; when the amount of bentonite and 0.6% 0,39%; when the amount of bentonite by 0.4% 0,26% and when the amount of bentonite 0,2% to 0.13%.
The reduction of iron content in the briquette due to the addition of carboxymethylcellulose insignificant as carboxymethylcellulose fade during metallurgical processing briquettes.
Thus, the method allows to obtain a durable and moisture-resistant briquettes for the simple technology of manufacturing briquettes at lower dilution by the metal briquette.
1. The method for producing briquettes from ores and/or concentrates of ferrous metal ores, comprising a polydisperse mixture of ferrous metal ores and/or concentrates, ores of ferrous metals with a binder and briquetting the mixture under pressure while in use as a binder solution of carboxymethyl cellulose with a concentration of 1-3 wt.% in an amount to provide a mixture with a moisture content 7-14%, with the addition of bentonite in the amount of 0.2-1% by weight polydisperse material.
2. The method according to claim 1, characterized in that the b is iKey calcined at a temperature of 900-1300°C.
FIELD: process engineering.
SUBSTANCE: invention may be used in paint-and-lacquer, pharmaceutical, cosmetic, food and metallurgical industries. Proposed method comprises iron ore crushing, grinding, wet magnetic separation to produce magnetic and nonmagnetic fractions, ultrasound oxidation destruction of nonmagnetic fraction, hydraulic classification, thickening and drying. Stage-by-stage hydraulic classification comprises primary classification and, at least, two cleaner classification. Magnetic fraction and sand of primary classification are pelletised using molasses as binder in amount of 1-5 wt% at moisture of pelletised blend of 8-12%.
EFFECT: iron oxide coloring agents and pelletised raw stock for metallurgy.
2 cl, 3 dwg, 1 ex
SUBSTANCE: metallic iron is produced by loading and heating lumpy material in reduction furnace with moving hearth for reduction of iron oxide contained in lumpy material with the help of carbon-containing reducing agent. Note here that lumpy material is produced by ball milling of the mix of materials containing said material that contains iron oxide, said carbon-containing reducing agent, binder and moisture, and drying mix of materials. Hydrocarbon is used as binder. Mix of materials is cured prior to ball milling for 0.5-4 hours. Note also that binder fraction in said mix makes about 0.5-1.5 wt %.
EFFECT: high mechanical strength, moderate content of binder and moisture.
2 dwg, 1 tbl
SUBSTANCE: mould contains particles of at least one alloy. Also particles of alloy correspond to titanium dioxide and binding material connecting particles of alloy in the mould. Notably, binding material contains organic polymer. Binding material changes its form and releases particles of alloy at heating the mould to specified temperature above 260°C. The mould includes approximately at least 18 % of organic polymer weight. The said moulds completely and uniformly are distributed in melt, which facilitates maintaining carbon contents in melt below allowed maximum, preferably below 0.04 wt % due to contents of from 18 wt % of organic polymer in the moulds, for example copolymer of ethylene and vinyl acetate or polyethylene of low density. Uniform distribution of alloying additives is achieved, for example by usage of moulds of dimension similar to dimension of other source materials added to melt.
EFFECT: uniform distribution of alloying additives.
44 cl, 5 dwg
SUBSTANCE: invention relates to pelleting of sulfide molybdenite concentrates granulations before oxidising roasting. Pelleting is implemented with addition of binding component - water solution of corn syrup with consumption of corn syrup, which is 3.0-4.0 kg per 100 kg of molybdenite concentrates. Additionally corn syrup contains 36-44% mono - and disaccharides.
EFFECT: receiving of pellets with strength >300 g/pel with using of organic binding, thoroughly decay during the process of oxidising roasting.
4 tbl, 3 ex
FIELD: ferrous metallurgy, namely production of iron ore pellets.
SUBSTANCE: method comprises steps of feeding charge into lumping apparatus by two flows; introducing first flow into gas flow at creating stream of gas and moistened charge; depositing charge; realizing seed formation; after-lumping seeds by means of second flow of charge; in addition introducing into gas flow organic filament like particles with diameter 0.01 - 1.0 mm and length 2 - 50 mm in quantity 0.1 -4.0% of charge mass. Deposition of charge and after-lumping of seeds are performed simultaneously.
EFFECT: improved strength of iron ore pellets.
1 dwg, 1 tbl, 1 ex
SUBSTANCE: invention relates to methods for lumping ground iron-ore raw in aim for it preparing to metallurgic conversion and utilization of iron-containing waste. At least one iron-containing material and a binding agent are mixed, the mixture is subjected for aggregation and prepared aggregates are strengthened. As a binding material method involves using a synthetic copolymer of acrylamide and sodium acrylate wherein the mole part of sodium acrylate can be from 0.5 to 99.5% and molecular mass in the range = (1 x 104)-(2 x 107) Da. Dosing synthetic copolymer of acrylamide and sodium acrylate is from 0.02 to 0.10 kg per a ton of iron-containing material. Copolymer of acrylamide and sodium acrylate can be used as a dry powder, solution, emulsion, suspension or aerosol, in pure state or as a mixture with additional material. Invention provides retaining the maximally high content of iron in lumped material possessing required physical and metallurgic properties, enhancing output of the technological process and creating additional parameters in operation of the lumping process.
EFFECT: improved lumping method.
2 tbl, 2 dwg, 1 ex
SUBSTANCE: charge comprises iron-ore material, fuel, flux and a binding agent containing organic surface-active substances. Charge comprises catamine as a binding agent. Charge comprises components taken in the following ratio, wt.-%: flux, 5-10; fuel, 5-10; catamine, 0.01-0.03; iron-ore material, the balance. Invention provides enhancing output of blast furnace and to reduce consumption of coke in using the proposed charge. Invention can be used in producing agglomerate in ferrous and nonferrous metallurgy used, in particular, in blast furnace manufacture.
EFFECT: improved and valuable properties of charge.
SUBSTANCE: invention relates to pelletising using stock consisting of iron ore or dust bearing metal oxides and may be used in production of reduced metal and separation of volatile metals, say, zinc and lead. First, pellets are produced using metal oxide powder containing iron oxide and, at least, one of zinc oxide, lead oxide and titanium oxide, to be compacted into briquettes. Total content of one of aforesaid oxides makes 10 wt % or more. Prior to compacting into briquettes, said pellets are dried to reduce moisture content by 50-95 wt %.
EFFECT: higher strength.
35 cl, 4 dwg, 2 tbl, 11 ex
SUBSTANCE: pellet manufacturing charge includes manganese raw material in the form of manganese concentrate, slag formation flux, reducing agent and binding agent. As binding agent, it contains slag as a result of melting of metal manganese, which is pre-crushed till specific surface area of 450-500 m2/kg in quantity of 7-14%. Water is added to the above charge, pellets are made and subject to hydration, and hardening and drying is performed at room temperature.
EFFECT: increasing mechanical strength of pellets, reducing the amount of moisture in pellets, decreasing the sintering temperature and reducing the consumption of carbonaceous materials.
2 cl, 2 tbl, 1 ex
SUBSTANCE: charge to obtain briquettes contains, by wt %: finely divided metal containing component 65-85, powdered sulfur-free carbonaceous component 10-30 and the binder 5-15. At that, as the carbonaceous the charcoal is used of fraction 50-250 mm and with an apparent density of 0.7-0.9 g/cm3. The charge may additionally comprise fine fluxing additives, preferably dolomitic clinker and/or lime in an amount of 0.5-2 wt % in the metal containing component.
EFFECT: obtaining of briquettes of high density and strength while reducing the number of sulfur-and phosphorus-containing components.
4 cl, 1 tbl
SUBSTANCE: crushed oily mill scale is mixed with dry caustic soda in an amount of 2-3 kg per 1% of oil per 1 ton of scale, then additionally with dry soda ash, 7-8 kg per 1% of oil per 1 ton of scale and claydite powder, 8-12 kg, respectively. Then it is poured with an aqueous solution of liquid glass with a density of 1350-1400 kg/m3 in the volume of 8-10 l of 1% oil per 1 ton of scale from the previously dissolved therein sodium fluorosilicate salt in an amount of 50-60 g per 1 litre of liquid glass solution.
EFFECT: invention helps to reduce energy consumption and improve the drying process and reduce drying time, improves granulation of oily scale without burning of oil and emission of harmful acid gases.
SUBSTANCE: invention relates to metallurgy, particularly, to preparing iron ore for melting. A line includes raw-material hoppers 1, 5, 6 and production lines 4, 8, 9, 10 for iron-ore concentrate, limestone and coke, mixing machine 12 and dosing machine 12 for limestone and coke, sintering machine 14 for limestone roasting, bunker 15 and weight-dosing equipment which supplied production line 4 for iron-ore concentrate with hot lime, mixing machine 16 for iron-ore concentrate and lime. A method includes iron-ore concentrate preparation and conveying to production line 4, mixing of lime fraction 3-10 mm with coke fraction 3-12 mm at ratio of 100% of lime and 9-12% of coke and conveying the mixture to sintering machine 14, lime roasting in sintering machine 14 as a result of which hot lime is produced, conveying of hot lime at a temperature of 200-300°C through hermetically sealed bunker 15 to production line 4 with damp iron-ore concentrate with iron-ore concentrate take of 80-120 kg/tonnes, stirring until a homogeneous mixture is obtained.
EFFECT: high-strength iron-ore-lime mixture with high wet-strength properties is obtained.
2 cl, 1 dwg
SUBSTANCE: invention relates to the area of iron-and-steel industry, to the charging material preparation for cast iron and steel production in particular. The pellet contains 7.6 - 49% of greased rolling scale, 50-91.4% of pure rolling scale and 1-2% of bond liquid steel. The greased rolling scale contains to 12% of mineral oil. The greased rolling scale/pure rolling scale ratio depending on the mineral oil content is 1:1.02 to 1:12, the oil content within the pellet not exceeding 1%.
EFFECT: enhanced pellet and rolling scale durability.
1 dwg, 3 tbl
SUBSTANCE: procedure consists in metered mixing oxide-containing material with carbon containing reducer, in supply of silica containing binding, in sintering, and in thermal treatment of manufactured agglomerates. Liquid glass is supplied to source mixture as a silica containing binding. Heat treatment of iron-carbon containing agglomerates is performed in rising and descending flows of gases which are supplied from a heat exchanger of cooling of kiln gases of a metallisation furnace. Temperature at heat treatment of agglomerates is maintained at 350-400°C.
EFFECT: reduced losses of charge material, reduced temperature and time of heat treatment.
2 cl, 2 tbl, 1 ex
SUBSTANCE: briquette for washing blast furnace includes flux materials, scale as iron-bearing material, Portland cement as binding agent and hardening catalyst. Slags of blast smelting of nickel and/or copper matte are used as flux materials, and solution of calcium chloride and/or solution of calcium nitrate is used as hardening catalyst. In order to obtain briquette, iron-bearing, flux components, binding agent and hardening catalyst are added to charge; charge is mixed and pressed in roller briquette press at specific pressure of 30-100 MPa.
EFFECT: obtaining briquette with high washing characteristics at its being used during blast-furnace smelting with low costs.
7 cl, 3 tbl, 1 ex
SUBSTANCE: agglomerate stone contains (in wt %) 6-15% of cement binding, up to 20% of carbon carrier, up to 20% of residual and return substances, selectively - up to 10% of accelerator of solidification and hardening and iron ore of stone form in shape of particles with grain less, than 3 mm; also agglomerate stone possesses early hardness of at least 5 H/mm2 in 3 days, and cold compressive strength of at least 20 H/mm2 in 28 days. Fine and super fine ore with grains up to 3 mm is used for preparation of agglomerate stone at production of iron. The method consists in mixing iron ore in form of thin or super thin dust with Portland cement or slag cement binding in form of hydraulic cement phase, also selectively in mixing with carbon carrier, residual or return substances and/or accelerator of solidification and hardening; mixture filled in moulds is compressed or is subject to shaking movement and is dried.
EFFECT: upgraded hardness of agglomerate stones and maintaining form even at high temperature.
19 cl, 3 dwg, 2 ex
SUBSTANCE: invention relates to ferrous metallurgy, namely to the composition of the briquette for cast iron smelting for obtaining zinc half-finished product. The briquette contains slurry of the blast furnace gas cleaner as carbonaceous, ferriferous and zinc-containing material with cement being a binding substance. The components in the briquette are in the following ratio, wt %: slurry of the blast furnace gas cleaner - 82-96, cement - 4-18.
EFFECT: output of the zinc half-finished product as collected dust with a high content of zinc.
FIELD: ferrous metallurgy.
SUBSTANCE: metallurgical briquette contains 7-15% ferrosilicium fraction 0-5 mm undersized matters, 65-80% carbon-silicon mixture of electrothermal production secondary products, and 13-20% material from group of oxide systems forming hydrate-hardening cements. Invention thus allows creation of additives with such composition, which eliminates formation of hard spots in thin-walled castings, stabilizes hardness along the depth of castings, and raises assimilation of carbon. Invention also enables using secondary materials from graphitized carbon and ferroalloy productions in metallurgical briquette composition.
EFFECT: improved quality of castings.