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Clean nickel ore pretreatment process

A pretreatment, nickel ore technology, applied in the direction of improving process efficiency, can solve the problems of slow nickel leaching rate passivation, large environmental pollution, low nickel leaching rate, etc., to achieve high nickel leaching rate, no environmental pollution, reduce The effect of waste emissions

Pending Publication Date: 2020-12-01
JIANGSU DELONG NICKEL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A clean nickel ore pretreatment process proposed by the present invention solves the problems of long treatment period, small nickel leaching rate, low output, large environmental pollution and obvious nickel leaching rate from fast to slow passivation in the later stage of the traditional process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A clean nickel ore pretreatment process, comprising the following steps:

[0027] (1) Mineral dressing: Pre-remove large bedrock with weak weathering degree and low nickel content in nickel ore by crushing and screening processes;

[0028] (2) Microwave sintering and pressure leaching: carry out microwave sintering to the nickel ore obtained through step (1) to destroy the mineral lattice, and then pressurize leaching under low temperature environment, and iron ions are precipitated to obtain hematite. ore leach out;

[0029] (3) Chlorination and ammonium leaching: add a certain amount of carbonaceous reducing agent and sodium chloride to the nickel ore obtained through step (2), and heat in a neutral environment to promote the chlorination of valuable metals from the ore Volatilize, reduce to metal particles on the surface of carbon particles, roast the chlorinated and separated nickel ore, and then directly carry out ammonia leaching treatment;

[0030] (4) Bacteria...

Embodiment 2

[0039] A clean nickel ore pretreatment process, comprising the following steps:

[0040] (1) Mineral dressing: Pre-remove large bedrock with weak weathering degree and low nickel content in nickel ore by crushing and screening processes;

[0041] (2) Microwave sintering and pressure leaching: carry out microwave sintering to the nickel ore obtained through step (1) to destroy the mineral lattice, and then pressurize leaching under low temperature environment, and iron ions are precipitated to obtain hematite. ore leach out;

[0042] (3) chlorination and ammonium leaching: add a certain amount of carbonaceous reductant and calcium chloride to the nickel ore obtained through step (2), and heat in a weakly reducing environment to impel valuable metals from ore chlorine Volatilize, reduce to metal particles on the surface of carbon particles, roast the nickel ore segregated by chloride, and then directly carry out ammonia leaching treatment;

[0043] (4) Bacteria screening: Bree...

Embodiment 3

[0052] A clean nickel ore pretreatment process, comprising the following steps:

[0053] (1) Mineral dressing: Pre-remove large bedrock with weak weathering degree and low nickel content in nickel ore by crushing and screening processes;

[0054] (2) Microwave sintering and pressure leaching: carry out microwave sintering to the nickel ore obtained through step (1) to destroy the mineral lattice, and then pressurize leaching under low temperature environment, and iron ions are precipitated to obtain hematite. ore leach out;

[0055] (3) Chlorination and ammonium leaching: add a certain amount of carbonaceous reducing agent and calcium chloride to the nickel ore obtained through step (2), and heat in a neutral environment to promote the chlorination of valuable metals from the ore Volatilize, reduce to metal particles on the surface of carbon particles, roast the chlorinated and separated nickel ore, and then directly carry out ammonia leaching treatment;

[0056] (4) Bacteri...

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Abstract

The invention belongs to the technical field of nickel ore pretreatment, and particularly relates to a clean nickel ore pretreatment process. Aiming at the problems of long treatment period, low nickel leaching rate, low yield, serious environmental pollution and obvious passivation of the later nickel leaching rate from fast to slow in the existing process, the invention provides the following scheme: (1) ore dressing: removing large bedrock with a weak weathering degree and low nickel content in nickel ore in advance by adopting the procedures of crushing, screening and the like; and (2) microwave sintering and pressure leaching: carrying out microwave sintering on the nickel ore treated in the step (1) to destroy mineral lattices, then carrying out pressure leaching in a low-temperatureenvironment, separating out iron ions, precipitating to obtain hematite, and filtering out the hematite. According to the method, the characteristics of the nickel ore can be well adapted, the ore leaching performance is excellent, the biological column leaching effect is excellent, and the biological leaching period is short; the metal yield is high; no pollution is caused to the environment; and the passivation problem that the nickel leaching rate obviously changes from high to low in the later leaching period can be solved, and the nickel leaching rate is high.

Description

technical field [0001] The invention relates to the technical field of nickel ore pretreatment, in particular to a clean nickel ore pretreatment process. Background technique [0002] Nickel is a silver-white metal with good mechanical strength and ductility, refractory and high temperature resistance, and high chemical stability. It is often used to manufacture stainless steel, high-nickel alloy steel and alloy structural steel, suitable for aircraft, missiles and Various military manufacturing industries such as tanks can also be used as hydrogenation catalysts in the chemical industry. In the beneficiation of nickel ore, the ore needs to be processed through a pretreatment process to ensure subsequent smelting and extraction. [0003] The existing nickel ore pretreatment process cannot adapt to the characteristics of nickel ore, resulting in poor leaching performance of nickel during leaching. The permeability and air permeability of ore pillars have not been improved thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B3/18C22B5/10C22B23/00
CPCC22B1/16C22B3/18C22B5/10C22B23/0415C22B23/0446Y02P10/20
Inventor 王启
Owner JIANGSU DELONG NICKEL IND CO LTD
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