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A method for co-processing chromium slag in submerged heat electric furnace smelting laterite nickel ore

A technology of lateritic nickel ore and submerged thermal electric furnace, which is applied in the field of co-processing chromium slag in smelting laterite nickel ore by submerged thermal electric furnace, can solve the problems of high economic cost of detoxification, poor detoxification effect of chromium slag, unfavorable promotion, etc., and achieve high efficiency and comprehensive treatment , increase the chromium content, improve the effect of economic benefits

Active Publication Date: 2017-09-29
CHINA IRON & STEEL RES INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method for co-processing chromium slag in smelting laterite nickel ore in submerged thermal electric furnace, which is used to solve the problems of poor detoxification effect of existing chromium slag, high economic cost of detoxification, and unfavorable promotion of co-processing and detoxification due to equipment problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The smelting equipment in this embodiment adopts a rotary kiln-submerged electric furnace (RK-EF), and the rated power of the submerged electric furnace is 15000kVA.

[0025] The undried laterite nickel ore contains about 30% physical water in its natural state, and it is sent to a drum drying kiln for drying to remove the physical water in it to obtain the dry basis of laterite nickel ore. The dry basis composition of laterite nickel ore is shown in Table 1 .

[0026] The chromium slag adopts chromium salt chromium slag, and the specific composition of the chromium slag is shown in Table 2. The chromium slag and the laterite nickel ore dry basis are weighed and mixed according to the mass ratio of 2wt%, and at the same time, 30% of the total mass of the stainless steel slag and the laterite nickel ore dry basis is added. 10% lump coal is mixed as reducing agent.

[0027] The prepared raw materials are sent to the feed inlet of the φ3.2m×65m rotary kiln for pretreatmen...

Embodiment 2

[0041] The smelting equipment in this embodiment adopts a sintering machine-submerged thermal electric furnace, and the rated power of the submerged thermal electric furnace is 15000kVA.

[0042] Raw material used in this embodiment and its composition: laterite nickel ore composition and service condition are identical with embodiment 1; The undried laterite nickel ore contains about 30% physical water in its natural state. It is sent to a drum drying kiln for drying to remove the physical water. The dry basis composition of laterite nickel ore is shown in Table 1.

[0043] Raw material ratio in this embodiment: the quality of stainless steel slag accounts for 5% of the dry basis of the laterite nickel ore; the powdered coal accounts for 15% of the total mass of the stainless steel slag and the dry basis of the laterite nickel ore.

[0044] Send the prepared smelting raw materials into the sintering machine for sintering pretreatment to obtain sintered ore. The heating source...

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Abstract

The invention discloses a method for chromium slag co-processing by means of smelting of laterite-nickel ores through an ore-smelting electric furnace. The method for chromium slag co-processing includes the steps that chromium slags are mixed with a laterite-nickel ore dry basis in a certain proportion and coal serving as a reducing agent or fuel is added to serve as smelting raw materials; the mixed smelting raw materials are pre-treated, and roasted ores or sintered ores are obtained; and the roasted ores or sintered ores are put in the ore-smelting electric furnace and smelted according to certain smelting parameters to obtain liquid nickel-chromium-iron, and meanwhile the purpose of detoxifying the chromium slags is achieved. The method is fully combined with the complementarity of the laterite-nickel ore and chromium slag constituents; chromium slag detoxifying is achieved, moreover the lime consumption during smelting can be reduced, the chromium content in ferro-nickel alloys is increased, and economic benefits of enterprises are improved; efficient overall treatment of dangerous solid wastes in China is facilitated, and meanwhile resourcezation can be achieved.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a method for co-processing chromium slag by smelting laterite nickel ore in a submerged heat electric furnace. Background technique [0002] Chromium slag hazardous waste mainly comes from industrial production such as chromium salt and stainless steel, and generally contains 2% to 10% of chromium oxide, mostly in the valence state of trivalent chromium and hexavalent chromium. Hexavalent chromium will cause serious corrosion to organisms and the environment due to its strong oxidizing properties, while trivalent chromium is less harmful, but it is easy to be absorbed and accumulated, and there is a greater risk of migration and conversion to hexavalent chromium, leaching High toxicity. Therefore, chromium-containing wastes are highly toxic and have been included in the national list of hazardous wastes as Class I hazardous wastes. [0003] At present, chromium slag is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02
CPCC22B23/005C22B23/023
Inventor 赵沛郭培民潘聪超庞建明刘云龙
Owner CHINA IRON & STEEL RES INST GRP