Method for producing chromium-based iron alloys through cutting wastes by crystalline silicon
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A technology of crystalline silicon cutting and silicon-chromium alloy, applied in the field of metallurgy, can solve the problems of small size of cutting waste, complex composition, difficult to select and use separately, etc., and achieve the effect of saving electric energy
Inactive Publication Date: 2015-10-07
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
The reason is that the cutting waste has a small particle size (1-10 μm) and complex components (coexistence of elemental silicon, carbonization, oxides and iron-containing compounds), and it is difficult to select and utilize them separately.
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Embodiment 1
[0045] [Example 1] South African chrome concentrate (Cr 2 o 3 44.3%, Cr / Fe=1.53, SiO 2 3.22%, Al 2 o 3 13.34%, MgO 9.74%, P 0.002%, S 0.010%, the rest is FeO, CaO) 220kg, polysilicon cutting waste powder (Si 43%, SiC 22%, Fe6.28%, the rest is SiO 2) 84kg, add 3kg of starch solution, pressurize into a ball. Add 168kg of lime (CaO>90%), smelt in a 0.5T induction furnace for 0.5h, and obtain 103kg of ferrochrome products (Cr>52%, Si<3%, C<2%, P, S<0.03%, and the rest Fe), power consumption 150kwh.
[0046] [Example two] Turkey chrome concentrate (Cr 2 o 3 48.58%, Cr / Fe=2.44, SiO 2 5.36%, Al 2 o 3 7.65%, MgO 15.71%, P 0.001%, S 0.004%, the rest is FeO, CaO) 1 ton, South African chrome concentrate (Cr 2 o 3 47.52%, Cr / Fe=1.82, SiO 2 2.25%, Al 2 o 3 1 3.35%, MgO 10.91%, P 0.0034%, S 0.0091%, the rest is FeO, CaO) 1 ton, polysilicon cutting waste powder (Si 45%, SiC 20%, Fe 5%, the rest is SiO 2 ) 0.7 tons, slaked lime 130kg, pressed into D=4cm ball by high-pr...
Embodiment 3
[0047] [Example three] Turkey chrome concentrate (Cr 2 o 3 49.15%, Cr / Fe=2.84, SiO 2 3.56%, Al 2 o 3 11.89%, MgO 16.97%, P 0.002%, S 0.005%, the rest is FeO, CaO) 2 tons, South African chrome concentrate (Cr 2 o 3 47.52%, Cr / Fe=1.82, SiO 2 2.25%, Al 2 o 3 13.35%, MgO 10.91%, P 0.0034%, S 0.0091%, the rest is FeO, CaO) 1 ton, polysilicon cutting waste powder (Si 45%, SiC 20%, Fe 5%, the rest is SiO 2 ) 4.2 tons, slaked lime 130kg, pressed into D=4cm balls by a high-pressure double roller press, in a 5-ton electric arc furnace, additionally add 0.5 tons of coke, 0.5 tons of silica, smelting time 1.5 hours, and obtain 2.6 tons of silicon-chromium alloy (Si≧ 40%, Cr≧30%, C<1.0%, P<0.02%, S<0.01%, the rest is Fe), and the power consumption is 2200kwh / ton product.
[0048] [Example 4] The batch material used in the 4300KVA submerged arc furnace consists of: South African chrome concentrate (Cr 2 o 3 47.52%, Cr / Fe=1.82, SiO 2 2.25%, Al 2 o 3 13.35%, MgO 10.91%,...
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Abstract
The invention belongs to the metallurgical field, and concretely relates to a new method for directly producing chromium-based iron alloy products in a metallurgical furnace by using a special furnace charge prepared through cutting wastes and chromium concentrate powder by monocrystalline or polycrystalline silicon. The method comprises the following steps: adding a certain amount of monocrystalline or polycrystalline silicon cutting waste powder to the chromium concentrate powder, processing through using a ball press or a disc pelletizer to prepare the spherical or block metallurgic furnace charge, and smelting in an induction furnace or an electric furnace to obtain medium-and-low-carbon ferrochrome, silicon-chromium-iron alloy and other chromium-based iron alloy products. The method reasonably and efficiently utilizes metallic silicon, silicon carbide and other high-quality high temperature metallurgical reducing agents contained in photovoltaic cutting wastes, directly uses the chromium concentrate powder, and adopts an electric-silicothermic metallurgy process through a one step technology. Compared with traditional methods, the method has the advantages of energy consumption saving, and solving of the pollution of solid wastes formed in the photovoltaic industry to the environment.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing chromium series ferroalloy products by using monocrystalline or polycrystalline silicon cutting waste and chrome concentrate powder. Background technique [0002] In the past 10 years, the average annual growth rate of the global photovoltaic industry has reached 41.3%. As a country with a large ferroalloy production capacity, China has also rapidly emerged as a major producer of solar photovoltaic cells. The silicon wafers needed to make solar cells are all cut from high-purity polycrystalline silicon ingots. Regardless of whether it is monocrystalline silicon used in the semiconductor industry or polycrystalline silicon used in solar cells, as much as 50% to 52% of the crystalline silicon will be ground into fine powder and enter the cutting waste slurry during the wafer cutting process. Regarding the recycling of monocrystalline silicon a...
Claims
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Application Information
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