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Method for producing ferrochrome employing medium-frequency induction furnace

An induction furnace and intermediate frequency technology, applied in the field of ferroalloy, can solve the problem of no ferrochrome, etc., and achieve the effect of reducing the process of ball making and sintering

Inactive Publication Date: 2014-04-02
吴正锡 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, so far, there is no literature report on the method of directly smelting chromite ore to produce ferrochrome in an intermediate frequency induction furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] A. On the inner wall of the furnace lining of the intermediate frequency induction furnace with a power of 1200KW, a 40mm thick graphite material layer is lined as the inner lining;

[0027] B, 450kg of chromite fine ore is loaded into this intermediate frequency induction furnace, and the chemical composition of chromite by mass percentage is: Cr2O3 content 37.1%, FeO content 10.7%, Al2O3 content 14.3%, MgO content 12.8%, SiO2 content 16.3%, CaO content 1.1%, P content 0.07%, S content 0.04%, and the rest are moisture and impurities.

[0028] Calculate the amount of coke, silica and dolomite that need to be added according to the composition and quantity of chromite:

[0029] The amount of Cr in the mine: 450X37.1%X104 / 152=114.22(Kg)

[0030] Fe quantity in mine: 450X10.7%X56 / 72=37.45(Kg)

[0031] SiO2 quantity in mine: 450X16.3%=73.35(kg)

[0032] The amount of MgO in the mine: 450X12.8% = 57.6 (Kg)

[0033] The amount of Al2O3 in the mine: 450X14.3% = 64.35 (Kg) ...

example 2

[0068] A. On the inner wall of the furnace lining of the intermediate frequency induction furnace with a power of 1200KW, a 40mm thick graphite material layer is lined as the inner lining;

[0069] B, 450kg of chromite fine ore is loaded into this intermediate frequency induction furnace, and the chromite composition is as follows by mass percentage: Cr2O3 content 37.1%, FeO content 10.7%, Al2O3 content 14.3%, MgO content 12.8%, SiO2 content 16.3% , CaO content 1.1%, P content 0.07%, S content 0.04%, and the rest are moisture and impurities.

[0070] Calculate the required coke, silica and dolomite according to the composition and quantity of chromite;

[0071] The amount of Cr in the mine: 450X37.1%X104 / 152=114.22(Kg)

[0072] Fe quantity in mine: 450X10.7%X56 / 72=37.45(Kg)

[0073] SiO2 quantity in mine: 450X16.3%=73.35(kg)

[0074] The amount of MgO in the mine: 450X12.8% = 57.6 (Kg)

[0075] The amount of Al2O3 in the mine: 450X14.3% = 64.35 (Kg)

[0076] b, coke requi...

example 3

[0111] A. On the inner wall of the furnace lining of the intermediate frequency induction furnace with a power of 1200KW, a 35mm thick graphite material layer is lined as the inner lining;

[0112] B, 500kg of chromite lump ore is loaded into this intermediate frequency induction furnace, and the composition of chromite ore by mass percentage is: Cr2O3 content 39..9%, FeO content 13.6%, Al2O3 content 13.9%, MgO content 14.6%, SiO2 The content of CaO is 10.6%, the content of CaO is 0.9%, the content of P is 0.06%, the content of S is 0.05%, and the rest is water and impurities.

[0113] Calculate the required coke, silica and dolomite according to the composition and quantity of chromite;

[0114] The amount of Cr in the mine: 500X39.9%X104 / 152=136.5(Kg)

[0115] Fe quantity in mine: 500X13.6%X56 / 72=52.9(Kg)

[0116] SiO2 quantity in mine: 500X10.6%=53(kg)

[0117] The amount of MgO in the mine: 500X14.6% = 73 (Kg)

[0118] The amount of Al2O3 in the mine: 500X13.9% = 69.5 ...

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Abstract

The invention discloses a method for producing ferrochrome employing a medium-frequency induction furnace. The method is characterized by comprising the following steps: A, designing and manufacturing the medium-frequency induction furnace with a furnace liner, the inner layer of which is made of a graphite material; B, loading a furnace charge composed of chromite, coke, silica and dolomite to the furnace, wherein the theoretical requirement of the coke, the silica and the dolomite can be calculated according to the smelting principle of ferrochrome, the coke is added according to 50-70% of calculated amount, the silica and the dolomite are added according to the calculated amount, the requirements of the ingredients of the chromite charged into the furnace are that: more than 36% of Cr2O3, more than 2% of Cr2O3 / FeO, less than 0.2% of C, less than 0.07% of P and less than 0.05% of S, and the content of Al2O3 is within the range of 10-15%; C, electrifying to smelt the furnace charge into melt; D, adding 1-3Kg of industrial salt to the melt according to 100Kg of ore, stopping electrifying after five minutes, removing the slag of the upper layer inside the furnace, and then discharging ferrochrome water. The ferrochrome smelted by the medium-frequency induction furnace can completely meet the requirements of the YB / T4154-2006 standard by practice for a plurality of times.

Description

1. Technical field [0001] The invention relates to the field of ferroalloys, in particular to a method for producing ferrochrome by using an intermediate frequency induction furnace instead of a submerged arc furnace. 2. Background technology [0002] The existing high-carbon ferrochrome is all produced by submerged arc furnace, and its process flow is: chromite lump ore + reducing agent + slag → submerged arc furnace → high-carbon ferrochrome, or chromite powder ore + reduction Agent + slag → ball making → sintering → submerged arc furnace → high carbon ferrochromium. Low carbon ferrochrome is generally produced by electric arc furnace. [0003] The medium frequency induction furnace is a power supply device that converts the power frequency 50HZ alternating current into the medium frequency (above 150HZ to 2500HZ). The medium-frequency alternating current flowing through the capacitor and the induction coil generates high-density magnetic force lines in the induction coi...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C27/06
Inventor 吴正锡林玉克
Owner 吴正锡
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