Technological briquettes for non-ferrous metallurgy and the method of its manufacture
(57) Abstract:The invention relates to the briquettes containing waste silicon, designed for non-ferrous metallurgy, and to methods for their manufacture. Technological briquette includes a waste of silicon, water and optionally contains starch in the following ratio, wt.%: waste silicon 94, starch, 0.5 to water of 5.5. Thus the range of particle sizes of silicon is 0.1 to 3.0 mm, the manufacturing Method involves mixing waste of silicon and water and briquetting the mixture. When mixing in the waste silicon add the starch, when this water is used in the amount of 5.5% by weight of the mixture. Manufactured briquettes are subjected to drying. Drying is carried out at a temperature of 20-28oWith in 12-24 hours the Invention allows to obtain a mechanically stable briquette simple and economical manner with a 100% absorption of silicon at its introduction into the melt. 2 S. and 1 C.p. f-crystals. The invention relates to the briquettes containing waste silicon, designed for non-ferrous metallurgy, and to methods for their manufacture.Primarily, the proposed briquettes will find application in the production of aluminum-silicon alloy used for the impregnation of silicon carbide electromagne the crucible for the production of aluminum-silicon alloy, fine and dust-like fraction to rise up and salakovac the mouth of the neck, resulting in the crucible fails. Therefore, the waste fraction of silicon less than 3.0 mm in production does not apply.Aluminum-silicon alloy contains usually 18-28% silicon. Silicon is introduced into the melt in the form of pieces the size of 20-50 mm Waste silicon (small and pulverulent fraction) after crushing silicon are typically not used and go to the dump, which reduces the use of silicon and increases its loss. The introduction of small melt fractions difficult (Altman, M. B. and other Smelting and casting of light alloys, M, metallurgy, 1969, 270).In a known method of producing briquettes comprising silicon-containing residues, the patent 2124058 (IPC With 22 1/242, 1998), the briquettes obtained by mixing silicon-containing residues (which are formed in the form of dust, obtained by crushing or fracture of elemental silicon) with a cardboard fibre and Portland cement, adding a mixture of water and formation of the resulting pasty mixture of pellets by compacting under pressure.In the embodiment of the patent 2124058, which is taken as a prototype, it was proposed to use silicon-containing residue as EXT is misteriosa residues using a pressing pressure.Disadvantage: the manufacture of such briquettes requires special equipment for pressing components and special technological process. This complicates and increases the cost of their production.The task of the invention is to create a process of briquette for use in non-ferrous metals, including waste silicon (small and particulate fractions) with a 100% absorption of silicon at its introduction into the melt and receiving briquette efficient and economical manner.The problem is solved in that the technological briquettes for non-ferrous metallurgy, including waste of silicon and water, according to the invention, further comprises starch in the following ratio, wt.%: waste silicon - 94, starch and 0.5, the water is 5.5, while the size of the particles of silicon are in the range of from 0.1 to 3.0 mmA method of manufacturing technology of briquette for nonferrous metallurgy, comprising mixing the waste of silicon and briquetting, according to the invention, when mixing in the waste silicon add starch and water, and after briquetting produce drying. Drying is carried out at t=20-28oWith in 12-24 hoursAt a temperature of less than 20oWith time and the education. This in turn promotes the release of metal from the crucible, dangerous to operating personnel, and disruption of the process of impregnation of the heater. Besides this there are large investment of time for drying of the briquettes.When the temperature is more than 28oC and the drying time more than 24 hours adhesive loses its properties - adhesion of the substance is reduced, which leads to changes in the structure of the briquette: increases the porosity and friability of the briquette; decreases its density. When a small density due to the large porosity of the pellet comes out the air, and starts bubbling metal, which affects the process of impregnation of electric surface heater turns rough, resulting in a product goes into marriage.The presence in the waste briquette silicon with a particle size in the range from 0.1 to 3.0 mm, provides the possibility of processing pulverulent and fine fractions at the expense of 100% of their use and comprehensibility. Introduction starch to create briquettes will get it in a simple way. Starch when using briquettes in the melt, burn and does not adversely affect the quality of the melt.STRs and particles, adding by mixing starch and water and drying at room temperature for 12-24 h can be obtained in a simple and economical manner.Conducted patent studies have not found a similar technical solutions that allows to draw a conclusion about the novelty and inventive step, because the solution is not clear from the current level of technology.The proposed solution can be applied in ferrous metallurgy in the production of aluminum-silicon alloys. The domestic industry has all the resources (materials, equipment) required to obtain the proposed briquettes and their use in industry.The essence of the proposed technical solution is illustrated by description of a specific implementation technology of briquette and method of its manufacture.In the proposed briquette used waste silica with particle sizes 0-3,0 mm Mass ratio of waste silicon, starch and water inside the briquette is preferably 94 respectively, of 0.5 to 5.5%. The starch used according to the invention may be selected from starches of any kind and, in particular, from natural tx2">Below is an example of manufacturing briquettes according to the invention.In the capacity of the injected waste silicon 9,4 kg, starch 50 g and water quantity - 550,- Carry out mixing until smooth.- Form the briquettes and put them to dry on the pallet.- Drying is carried out at room temperature 20-28oWith in 12-24 hours- Obtained dried briquettes are Packed in a box, convenient for transportation.The briquettes produced in this way can be used in non-ferrous metallurgy in the production of aluminum-silicon alloys as the sole source of silicon or in combination with a large crystalline silicon. The digestibility of them in the melt is 100%.The proposed method of manufacturing technology of briquette allows simple and economical way to obtain a mechanically stable pellets, dried at room temperature, i.e., to reduce energy consumption. 1. Technological briquettes for non-ferrous metallurgy, including waste of silicon and water, characterized in that it further comprises starch in the following ratio, wt.%: waste silicon 94, the collapse of the technological briquettes for non-ferrous metallurgy, includes mixing waste of silicon and water and briquetting the mixture, characterized in that, when mixed in the waste silicon add the starch, when this water is used in the amount of 5.5% by weight of the mixture, and manufactured briquettes are subjected to drying.3. The method according to p. 2, characterized in that the drying is carried out at a temperature of 20-28C within 12-24 hours
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 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
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 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
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: 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
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: 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
SUBSTANCE: invention relates to a method of making fuel briquettes, which involves mixing carbon filler with ground coal, adding a binding substance and briquetting the mixture under pressure. The carbon filler, which is in form of aluminium wastes, anode paste and electrodes in amount of 25.1-85.00 wt %, is dry-mixed with ground brown coal until a 100% dry mass is obtained, followed by addition of the binding substance to the dry mass. The binding substance used is bitumen or polyvinyl alcohol in amount of 2-10 wt %, in excess of 100% of the dry mass. If polyvinyl alcohol is used as the binder, hydrophobic additives are added to the obtained mixture in amount of 1-5 wt %, in excess of 100% of the obtained mixture.
EFFECT: improved properties.
3 cl, 3 tbl, 2 dwg
SUBSTANCE: invention relates to metallurgical, casting production, and namely to production of cast irons operating under abrasive wear conditions. The method involves preparation of a mixture of initial material with further moulding. As initial material, crushed metal chips and metal scrap in the form of scale and scrap of ferrous metals, which are mixed with cryolite, and zircon and ilmenite concentrate, are used. Water solution (40%) of glyoxal is used as the binding agent. Components of the briquette are contained in the following ratio, wt %: metal chips and metal scraps in the form of scale and scrap of ferrous metals - 60, cryolite - 20, zircon concentrate - 7.5, ilmenite concentrate - 7.5, water solution (40%) of glyoxal - 5. The obtained mixture is homogenised by mixing, formed into a briquette by pressing and dried during 3 hours at 80°C.
EFFECT: according to the invention, use of briquettes will allow increasing wear resistance of the obtained cast iron.
2 cl, 2 dwg, 2 ex