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Method of selective sulfidation roasting for laterite nickel ore

A laterite nickel ore, selective technology, applied in chemical instruments and methods, flotation, process efficiency improvement and other directions, can solve the problems of high energy consumption, long process, low energy consumption, etc., achieve low energy consumption, enrichment The effect of large ratio and low roasting temperature

Active Publication Date: 2018-12-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems such as long flow process, large energy consumption and high cost in the pyrotechnics of laterite nickel ore in the prior art, the object of the present invention is to provide a method for converting nickel and iron in laterite nickel ore into easily The nickel sulfide ore recovered by flotation and the magnetite easily recovered by magnetic separation realize the efficient separation and recovery of nickel and iron from other metals. This method has low energy consumption, low cost, simple process, and is convenient for industrial production and application

Method used

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  • Method of selective sulfidation roasting for laterite nickel ore
  • Method of selective sulfidation roasting for laterite nickel ore

Examples

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Effect test

Embodiment 1

[0050] The laterite nickel ore is dried until the moisture content is less than 5%, and after being crushed, passed through a 5mm sieve, mixed with 10% of the mass fraction of sodium carbonate, 7.5% of charcoal, 5% of sulfur, and 3% of CMC to form pellets. The diameter of the pellets is 25-50 mm. The pellets are placed in a self-made rotary kiln, firstly roasted at 400 ° C for 2 h, then heated to 1000 ° C for 1.5 h, and cooled to room temperature under nitrogen protection; the results of phase analysis show that 90 % of nickel exists in the form of sulfide, and more than 85% of iron exists in the form of ferric oxide; the roasted product is finely ground in the mill until the pulp particle size is -74μm, accounting for 80%, and amyl xanthate is used for collection Nickel concentrate can be obtained with 8.3% nickel content and a nickel recovery rate of 78.6% through the flotation of nickel; the flotation tailings can be magnetically separated under a magnetic field strength of ...

Embodiment 2

[0052] The laterite nickel ore is dried until the moisture content is lower than 5%, and after being crushed, passed through a 5mm sieve, mixed with 5% sodium sulfate, 5% coke, 15% sulfur, and 5% bentonite to form pellets. The diameter of the pellets is 25-50mm. The pellets are placed in a self-made rotary kiln, firstly roasted at 400°C for 3h, then heated up to 950°C for 1h, and cooled to room temperature under nitrogen protection; the results of phase analysis show that 95% of the calcined sand The above nickel exists in the form of sulfide, and more than 78% of the iron exists in the form of ferric oxide; the roasted product is finely ground in the mill until the pulp particle size is -74μm, accounting for 75%, and isopropyl xanthate is used as the capture Collector flotation nickel can obtain nickel concentrate with nickel content of 6.8% and nickel recovery rate of 84.3%; the flotation tailings can be magnetically separated under the magnetic field strength of 0.8KGs to ob...

Embodiment 3

[0054] The laterite nickel ore is dried until the moisture content is less than 5%, and after being crushed, passed through a 5mm sieve and mixed with 5% sodium sulfate, 5% sodium carbonate, 10% pulverized coal, 7.5% sulfur, 2.5% The gelatinized starch was mixed evenly to make pellets. The diameter of the pellets was 25-50mm. The pellets were placed in a self-made rotary kiln, firstly roasted at 400°C for 2h, then heated to 950°C for 2h, and cooled to room temperature under nitrogen protection; The analysis results show that more than 92% of the nickel in the roasted product exists in the form of sulfide, and more than 82% of the iron exists in the form of ferric oxide; the roasted product is finely ground in the mill until the pulp particle size is -74μm, accounting for 85% , using isopropyl xanthate as a collector to flotation nickel sulfide, nickel concentrate with a nickel content of 7.8% and a nickel recovery rate of 81.8% can be obtained; the flotation tailings can be mag...

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Abstract

The invention discloses a method of selective sulfidation roasting for laterite nickel ore. According to the method of selective sulfidation roasting for the laterite nickel ore, the laterite nickel ore is mixed with raw materials including a carbonaceous reducing agent, a sulfurizing agent, an alkali metal salt additive and a binder for even mixing and pelletizing, the obtained pellets are roasted in the first stage at low temperature and roasted in the second stage at high temperature; and nickel products are recovered from roasted materials by a flotation method, and iron products are recovered from flotation tailings by a magnetic separation method. The method has a good recovery effect on nickel and iron, low energy consumption, low cost and simple process, and is beneficial to industrial large-scale production and application.

Description

technical field [0001] The invention relates to a treatment method of laterite nickel ore, in particular to a method for selectively converting nickel laterite nickel ore into nickel sulfide ore which is easy to be separated by flotation through reduction-sulfidation roasting, and selectively converting iron into nickel sulfide ore which is easy to be separated by magnetic separation. The magnetite method belongs to the field of non-ferrous metallurgy technology and mineral processing. Background technique [0002] Nickel is an important strategic metal material, widely used in stainless steel production, alloy manufacturing, new energy battery production and so on. The world's nickel resource reserves are about 470 million tons, of which 70% are laterite nickel ore and 30% are nickel sulfide ore. 60% of the world's nickel is extracted from nickel sulfide ore. However, with the increasing depletion of nickel sulfide ore resources, laterite nickel ore More and more attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/245C22B23/00C22B1/216B03D1/00B03C1/02
CPCB03C1/02B03D1/00C22B1/216C22B1/2406C22B1/243C22B1/245C22B23/005Y02P10/20
Inventor 韩俊伟刘维覃文庆焦芬张添富李琛梁超
Owner CENT SOUTH UNIV
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