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Preparation method for silicon-calcium-iron alloy

A silicon-calcium-iron alloy and silica technology, applied in the field of silicon-calcium-iron alloy and silicon-calcium-iron alloy preparation, can solve the problems of difficulty in reduction of silicon and calcium and high cost of raw materials, and achieve the advantages of reducing agglomeration cost, reducing production cost and avoiding environmental pollution. Effect

Active Publication Date: 2017-03-01
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, on the one hand, adopt mixed feeding method, CaO and SiO 2 It is easy to form silicate with low melting point, which makes the reduction of silicon and calcium difficult; on the other hand, using conventional raw materials such as lime, ferrosilicon and a large amount of metal additives as raw materials, the cost of raw materials is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Crush copper slag, carbide slag and coal to less than 0.1mm;

[0028] (2) according to calcium carbide slag: the mass ratio of coal=100:100 is mixed and formed uniformly, obtains the block particle size 30mm as the first mixed block, dries, makes the moisture content of the mixed block controlled below 1%;

[0029] (3) Copper slag: silica: coal: calcium carbide slurry = 100:100:100:3 mass ratio mixed uniformly, and the obtained material block particle size 20mm is the second mixed material block, which is dried to control the moisture content of the mixed material block Below 1%; Among them, Ca(OH) in carbide slag slurry 2 The concentration is 20wt%;

[0030] (4) Send the above-mentioned dried first mixed material block and the second mixed material block into an electric furnace for smelting in a circular distribution manner, at a temperature of 1800 ° C, release it every 90 minutes, and obtain a silicon-calcium-iron alloy after standing still for slag removal ; ...

Embodiment 2

[0033] (1) Broken copper slag, calcium carbide slag, and semi-coke to less than 0.1mm;

[0034] (2) According to the mass ratio of calcium carbide slag:semi-coke=100:90, mix and form uniformly, obtain the block particle size 35mm as the first mixed block, dry, so that the moisture content of the mixed block is controlled below 1%;

[0035] (3) According to the mass ratio of copper slag: silica: semi-coke: calcium carbide slag slurry = 100: 110: 120: 4, it is uniformly mixed and formed, and the particle size of the obtained block is 24mm as the second mixed block, which is dried to make the mixed block The moisture content is controlled below 1%; among them, Ca(OH) in the calcium carbide slag slurry 2 The concentration is 30wt%;

[0036] (4) Send the first and second mixed material blocks after drying above into an electric furnace for smelting in a circular distribution manner, at a temperature of 1850 ° C, release them every 80 minutes, and obtain a silicon-calcium-iron allo...

Embodiment 3

[0039] (1) Broken copper slag, carbide slag, and coke powder to less than 0.1mm; wherein, copper slag is the tailing slag of copper smelting, with an iron content of 38wt% and a silicon content of 45wt%; coke powder is metallurgical coke, semi-coke, petroleum coke , coal, semi-coke mixture.

[0040] (2) According to the mass ratio of calcium carbide slag:coke powder=100:80, mix and form uniformly, obtain the block particle size 25mm as the first mixed block, dry, so that the moisture content of the mixed block is controlled below 1%;

[0041](3) According to the mass ratio of copper slag: silica: coke powder: calcium carbide slag slurry = 100: 120: 120: 8, it is uniformly mixed and formed, and the particle size of the obtained block is 15 mm as the second mixed block, which is dried to make the mixed block The moisture content is controlled below 1%; among them, Ca(OH) in the calcium carbide slag slurry 2 The concentration is 15wt%;

[0042] (4) Send the above-mentioned drie...

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Abstract

The invention discloses a preparation method for silicon-calcium-iron alloy. The preparation method includes the steps of: 1) mixing and shaping carbide slag and a carbon reduction agent to obtain a first blended material bulk, and drying the first blended material bulk for later use; 2) mixing and shaping copper slag, the carbon reduction agent, silica and a binder to obtain a second blended material bulk, and drying the second blended material bulk for later use; and 3) smelting the dried first blended material bulk and second blended material bulk in an electric furnace to produce the silicon-calcium-iron alloy. In the method, calcium oxide in the carbide slag and silicon dioxide and the like valuable components in the copper slag are fully utilized to produce high-additional-value iron alloy. The method not only achieves comprehensive utilization of the valuable components in the waste solid but also reduces production cost, can turn the waste into resources and solves environment pollution.

Description

technical field [0001] The invention relates to a silicon-calcium-iron alloy, in particular to a method for preparing the silicon-calcium-iron alloy, and belongs to the field of ferroalloy preparation. Background technique [0002] Silicon-calcium-ferroalloy plays an important role in iron and steel smelting and use, and is an ideal compound deoxidizer and desulfurizer for smelting high-quality steel. In addition, silicon-calcium alloy can also be used as a warming agent for converter steelmaking, a main dusting agent for ladle refining, an inoculant in cast iron production and an additive in ductile iron production. [0003] In the existing smelting process, there are one-step method and two-step method for the preparation of silicon-calcium-ferroalloy, and the raw materials are silica, lime, carbonaceous reducing agent and the like. The one-step method is to simultaneously reduce silica and lime with carbon in the same electric furnace to obtain silicon-calcium alloy, whi...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B4/06
CPCC22B1/2406C22B1/243C22B4/06
Inventor 闫方兴任中山徐刚曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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