Clean production method for treating waste residues of reduction roasting nickel laterite ore to prepare ferronickel

A clean production, laterite nickel ore technology, applied in the field of non-ferrous metal metallurgy, can solve the problems of difficult treatment, heavy pollution, large waste slag discharge, etc., and achieve the effect of eliminating pollution, reducing pollution and realizing comprehensive utilization.

Active Publication Date: 2013-09-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims at the problems of large amount of waste slag discharge, heavy pollution and difficult treatment in the existing pyrometallurgy process of laterite nickel ore, realizes the recovery and utilization of valuable metals nickel and chromium in the waste slag of ferronickel from reduction smelting of laterite nickel ore, and reduces the toxicity of the waste slag Waste discharge, increase the industrial utilization value of pyrometallurgy of laterite nickel ore

Method used

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  • Clean production method for treating waste residues of reduction roasting nickel laterite ore to prepare ferronickel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The raw material is the waste slag obtained by reducing and smelting ferronickel from Indonesian laterite nickel ore, and its main element composition is: Fe 2 o 3 :45.56%, Ni:0.26%, Co:0.012%, MgO:3.37%, Cr:4.55%, Al:3.61%, SiO 2: 10.05%. After jaw crushing, vibrating screening, and wet ball milling (ball milling time 10 minutes), the material with a particle size of 65-150 mesh accounts for more than 80wt% of the total material, and is separated by wet magnetic separation under a magnetic field strength of 2000 gauss to obtain rich Ni-containing magnetic separation concentrate and Cr-rich magnetic separation tailings. Among them, the grade of Ni in the concentrate reaches 3.15%, and the grade of Cr in the tailings reaches 6.02%. The waste slag particles with a particle size greater than 5mm after the above-mentioned vibratory screening are subjected to jaw crushing again.

[0036] Using magnetic separation tailings as raw material, weigh sodium carbonate and taili...

Embodiment 2

[0039] The raw material is the waste slag obtained by reducing and smelting ferronickel from Indonesian laterite nickel ore, and its main element composition is: Fe 2 o 3 :43.16%, Ni:0.33%, Co:0.015%, MgO:4.85%, Cr:6.06%, Al:2.67%, SiO 2 :9.28%. After crushing and ball milling (ball milling time 30min), wet magnetic separation is carried out under the magnetic field strength of 500 Gauss to obtain Ni-rich magnetic separation concentrate and Cr-rich magnetic separation tailings. Among them, the grade of Ni in the concentrate reaches 3.41%, and the grade of Cr in the tailings reaches 6.98%.

[0040] Using magnetic separation tailings as raw materials, weigh sodium hydroxide and tailings according to the proportion of solid alkali ore ratio of 1.5:1, mix them evenly, place the materials in a tablet press, and press under the condition of a pressure of 5Mpa. Block, hold pressure for 10min. Then the pressed sample was put into a corundum crucible and placed in a muffle furnace,...

Embodiment 3

[0043] The raw material is the waste slag obtained by reducing and smelting ferronickel from Indonesian laterite nickel ore, and its main element composition is: Fe 2 o 3 :45.77%, Ni:0.28%, Co:0.010%, MgO:4.01%, Cr:5.86%, Al:2.97%, SiO 2 :8.94%. After crushing and ball milling (ball milling time 60min), wet magnetic separation is carried out under the magnetic field strength of 3000 Gauss to obtain Ni-rich magnetic separation concentrate and Cr-rich magnetic separation tailings. Among them, the grade of Ni in the concentrate reaches 3.68%, and the grade of Cr in the tailings reaches 7.22%.

[0044] Using magnetic separation tailings as raw materials, weigh potassium hydroxide and tailings according to the proportion of solid alkali ore ratio of 1:1, mix them evenly, put the materials in a tablet press, and press them under the condition of a pressure of 10Mpa. Block, hold pressure for 10min. Then the pressed sample was put into a corundum crucible and placed in a muffle fu...

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Abstract

The invention relate to the technical field of nonferrous metallurgy, and specifically relates to a clean production method for treating waste residues of reduction roasting a nickel laterite ore to prepare ferronickel. The method comprises the following steps of 1) crushing and grinding waste residues of reduction roasting the nickel laterite ore to prepare ferronickel, and then carrying out magnetic separation to obtain a Ni-rich magnetic concentrate and a Cr-rich magnetic tailing; 2) wet-grinding the Cr-rich magnetic tailing, dry mixing a solid alkali and the Cr-rich magnetic tailing and briquetting the mixture; 3) performing an alkali fusion roasting reaction on the briquetted mixture and grinding to prepare samples; 4) washing grinded clinker with clear water and filtering to obtain an alkaline filtrate solution, wherein a water washing temperature is controlled within 30-95 DEG C; 5) preparing chromic oxide by using the alkaline filtrate solution; and 6) extracting Ni from the Ni-rich magnetic concentrate. The clean production method for treating the waste residues of reduction roasting the nickel laterite ore to prepare ferronickel with industrial operationality and environmental friendliness is provided by the invention; and the clean production method provides an effective approach for comprehensive utilization of the nickel laterite ore.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a clean production method for treating waste slag of ferronickel after reduction and roasting of laterite nickel ore. Background technique [0002] Due to the progress of steelmaking technology, steel mills that used pure nickel raw materials to smelt alloy steel and stainless steel have switched to non-pure nickel from an economic point of view. Therefore, pyrometallurgy has developed rapidly. At present, about 50% of the world's nickel production comes from laterite ore, of which 70% of nickel is recovered by pyrotechnic process, and the products are ferronickel or nickel matte. [0003] The most widely used laterite nickel ore pyrolysis process in the world is electric furnace reduction smelting to produce ferronickel, which is used to produce stainless steel. Nickel oxide is easily reduced by C, CO, and Si. Controlling certain reduction conditions at a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/32C22B23/00
CPCY02P10/20
Inventor 郭强曲景奎宋云霞张培育齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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