Preparation method for mother liquid of nickel chrome stainless steel

A technology of stainless steel and nickel-chromium series, applied in the field of preparation of nickel-chromium series stainless steel mother liquor, can solve the problems of high equipment investment cost, high raw material cost and high operating cost, shorten the smelting cycle, reduce energy consumption, and overcome the problems of complex process. Effect

Pending Publication Date: 2017-09-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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Problems solved by technology

However, these traditional processes have the defects of high energy consumption, large pollution, and high operating costs.
[0006] Therefore, in order to solve the problems of high raw material cost, high operating cost, high equipment investment cost, high energy consumption, large pollution, and long process in the preparation of stainless steel mother liquor, it is necessary to improve its preparation process.

Method used

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  • Preparation method for mother liquid of nickel chrome stainless steel

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preparation example Construction

[0023] Such as figure 1 Shown, the preparation method of nickel-chromium series stainless steel mother liquor provided by the invention comprises the steps:

[0024] (1) The laterite nickel ore raw material is dried to a water content of 5-20 wt%, and crushed to a particle size of ≤3 mm to obtain the laterite nickel ore. Mix the laterite nickel ore, chromite powder ore, carbon-containing reducing agent and additive according to the mass ratio: 40%-60%: 20%-40%: 8%-15%: 1%-6%, and mix uniformly to obtain Mixture. Among them, the particle size of the chromite powder ore is ≤1mm. The particle size of the carbon-containing reducing agent is ≤1mm.

[0025] The chromite powder ore selected in the present invention is the powder ore produced during the mining process of the chromite ore.

[0026] In the present invention, the reducing agent is selected from one of anthracite, coke powder or semi-coke. In addition, in the reducing agent, the mass content of fixed carbon is 70%-90...

Embodiment 1

[0035] In laterite nickel ore: TFe=17.0wt%, TNi=1.69wt%, in chromite fine ore: TFe=19.2wt%, Cr 2 o 3 = 43.4 wt%. The carbon-containing reducing agent is selected from anthracite, wherein the fixed carbon content is 82.6wt%. The mass ratio of each component in the additive is: silica: limestone: soda ash = 50%: 40%: 10%.

[0036] The laterite nickel ore raw material is dried until the water content is 15wt%-20wt%, and crushed until the particle size is less than 3mm to obtain the laterite nickel ore. The laterite nickel ore, the chromite powder ore, the carbon-containing reducing agent and the additive are uniformly mixed according to the mass ratio of 60%:30%:8%:2% to obtain the mixture. The mixture was pressed into balls with a double-roller briquetting machine, with a linear pressure ratio of 5 t / cm, and then dried at a temperature of 300° C. for 100 minutes to obtain pellets. The pellets were reduced and roasted at a temperature of 1400° C. for 30 minutes to obtain pre-...

Embodiment 2

[0039] In laterite nickel ore: TFe=14.6wt%, TNi=0.98wt%, in chromite fine ore: TFe=21.2wt%, Cr 2 o 3 = 41.3 wt%. The carbon-containing reducing agent is coke powder, in which the fixed carbon content is 79.7wt%. The mass ratio of each component in the additive is: silica:limestone=60%:40%.

[0040]The laterite nickel ore raw material is dried until the water content is 10wt%-15wt%, and crushed until the particle size is less than 3mm to obtain the laterite nickel ore. The laterite nickel ore, chromite powder ore, carbon-containing reducing agent and additive are uniformly mixed according to the mass ratio of 50%: 35%: 12%: 3% to obtain a mixture. The mixture was pressed into balls with a double-roller briquetting machine with a linear pressure ratio of 6 t / cm, and then dried at 200° C. for 120 minutes to obtain pellets. The pellets were reduced and roasted at 1350° C. for 45 minutes to obtain pre-reduced pellets. The hot pre-reduced pellets are sent to a submerged electri...

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Abstract

The invention relates to a preparation method for mother liquid of nickel chrome stainless steel. The preparation method comprises the steps that laterite-nickel ore, chromite fine ore, a carbonous reducing agent and an annexing agent are evenly mixed according to the mass ratio of 40%-60% : 20%-40% : 8%-15% : 1%-6%, a mixed material is obtained, wherein the water content of the laterite-nickel ore is 5%-20%; the mixed material is pressed into balls and dried, and pellets are obtained; and the pellets are roasted under a reducing atmosphere at 1250-1400 DEG C, and pre-reduced pellets are obtained; and the pre-reduced pellets are transported to a smelting furnace in a hot transportation mode to be smelted, and then the mother liquid of the nickel chrome stainless steel is obtained after slag-iron separation. According to the preparation method for the mother liquid of the nickel chrome stainless steel, the smelting cycle is shortened, the materials are extensive in source and low in price, and the smelting cost of stainless steel is reduced greatly; and compared with the prior art in which the treatments on ferro-nickel and ferrochrome are two independent technologies correspondingly, the preparation method for the mother liquid of the nickel chrome stainless steel overcomes the defects that existing technologies are complex, the technological process is long, the energy consumption is high, pollution is severe, and the operation cost is high, and the energy consumption of smelting of an electric furnace is effectively reduced.

Description

technical field [0001] The invention belongs to the field of stainless steel smelting, and in particular relates to a method for preparing a nickel-chromium stainless steel mother liquor. Background technique [0002] In recent years, my country's stainless steel production capacity has grown rapidly, and the demand for ferrochrome and metal nickel has continued to increase. Traditional stainless steel smelting mainly uses chromium-iron alloy and pure nickel (or nickel-iron alloy) as the main alloy raw materials. However, with the deterioration of global mineral resources, the production cost of ferrochromium and nickel-containing raw materials has increased, and the production cost of stainless steel has also increased accordingly. [0003] At present, the preparation of stainless steel mother liquor at home and abroad mainly adopts traditional stainless steel mother liquor preparation processes such as electric furnace, intermediate frequency furnace, and converter. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21B13/14
CPCC22C33/06C21B13/0046C21B13/006C21B13/14
Inventor 闫方兴任中山曹志成徐刚吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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