Method for efficiently recovering ferronickel alloy from stainless steel sludge

A nickel-iron alloy and stainless steel technology is applied in the field of efficient recovery of nickel-iron alloys in stainless steel sludge, which can solve the problems of low nickel and iron recovery rate, singleness, and inability to recover heavy metals, and achieves the effect of being beneficial to reduction and recovery.

Active Publication Date: 2017-05-31
BAOSTEEL DESHENG STAINLESS STEEL
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Problems solved by technology

This method is a dry smelting method without acid or alkali, and is environmentally friendly. However, the recovery rate of nickel and iron in this method is still low, specifically: the recovery rate of nickel is only 89%, and the recovery rate of iron is only 68%. %
Moreover, since the raw materials of this method contain not only stainless steel sludge, but also electroplating slud

Method used

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  • Method for efficiently recovering ferronickel alloy from stainless steel sludge
  • Method for efficiently recovering ferronickel alloy from stainless steel sludge

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Embodiment approach

[0025] A method for efficiently reclaiming ferronickel in stainless steel sludge, comprising the following steps:

[0026] (1) Mix stainless steel sludge with laterite nickel ore to make mixture A, and the mass ratio of nickel and iron in mixture A is 0.07-0.12;

[0027] (2) Mixture A is dried in a drying kiln, the temperature in the kiln is 850°C-900°C, and the drying time is 15-20min;

[0028] (3) Add a carbonaceous reducing agent and limestone to the dried mixture A to obtain a mixture B, and roast the mixed material B in a rotary kiln to obtain calcined sand; the carbonaceous reducing agent is coke The mixture of powder and blue charcoal powder, the amount of carbonaceous reducing agent is 2.5%-6% of the mixture B, and the particle size is 8-20mm; the amount of limestone is 0.5-6% of the mixture B; the kiln of the rotary kiln The internal residence time is 90-180min, and the temperature of the high temperature section in the rotary kiln is 600-1100°C;

[0029] (4) The ca...

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Abstract

The invention provides a method for efficiently recovering a ferronickel alloy from stainless steel sludge. Firstly, the stainless steel sludge and a nickel laterite ore are mixed according to a nickel-iron mass ratio of 0.07-0.15, and then, are dried by a drying kiln; the temperature in the drying kiln is 850-900 DEG C; and the drying time is 15-20 min; a carbon reducing agent with a particle size of 8-20 mm and limestone are added for roasting by a rotary kiln; the stop time in the rotary kiln is 90-180 min; the temperature of a high-temperature section in the rotary kiln is 600-1100 DEG C; finally, the mixture is reduced and smelted by a submerged arc furnace to obtain molten iron containing the ferronickel alloy; and the smelting temperature in the submerged arc furnace is 1550-1600 DEG C. The method enables the recovery rates of nickel and iron in the stainless steel sludge to respectively reach above 93% and 81%, and meanwhile, prevents the environmental pollution problem in wet smelting.

Description

technical field [0001] The invention belongs to the field of heavy metal reuse, in particular to a method for efficiently recycling nickel-iron alloys in stainless steel sludge. Background technique [0002] Due to global economic integration, the global stainless steel industry is continuously shifting from North America and Europe to Asia. Especially in recent years, the stainless steel industry in developed countries (Europe, America and Japan) is shifting to emerging market countries represented by China. In 2015, the annual output of stainless steel reached 24 million tons. [0003] A large amount of sludge is generated in the stainless steel production process. Moreover, these sludges contain elements such as nickel, chromium, iron, sulfur, chlorine, and fluorine. These elements are relatively complex in nature, not only harmful to the environment, but also directly affect human health, and are listed as national hazardous waste. [0004] The treatment technology of ...

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Application Information

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IPC IPC(8): C22B1/02C21B13/14C22B23/02
Inventor 李想
Owner BAOSTEEL DESHENG STAINLESS STEEL
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