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Preparation method of laterite nickel ore pellet

A technology of lateritic nickel ore and pellets, which is applied in the field of metallurgy, can solve the problems of difficult large-scale equipment, dust pollution, high energy consumption, etc., and achieve the effects of reducing drying costs, protecting the environment, and low production costs

Inactive Publication Date: 2019-07-26
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the existing pellet preparation methods are all high-energy-consuming processes of raw ore drying→crushing→dry grinding→adding water to make pelletsdrying, which have high energy consumption, low efficiency, difficulty in large-scale equipment, and dust pollution. Serious and other outstanding problems

Method used

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  • Preparation method of laterite nickel ore pellet
  • Preparation method of laterite nickel ore pellet
  • Preparation method of laterite nickel ore pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] see figure 1 and figure 2 , a preparation method of laterite nickel ore pellets, comprising the steps of:

[0030] 1) Grinding and grading: Feed the laterite nickel ore 1 with a particle size of less than 350mm into the semi-autogenous mill 2, and the discharged ore is classified by the linear vibrating screen 3, and the material larger than 10mm is transported to the crusher 5 by the belt 4 and then returned to the semi-autogenous mill for crushing. Self-grinding machine 2; materials less than 10 mm are sent to cyclone 8 for classification through pump box 6 and slurry pump 7, and the cyclone sinks into ball mill 9 for grinding, and the cyclone overflow is the qualified particle size (less than 0.5 mm) pulp, the pulp moisture content is about 60%;

[0031] 2) Concentration and dehydration: For qualified pulp, thickener 10 is used to concentrate first, and then horizontal spiral sedimentation centrifuge 11 is used for dehydration to obtain materials with a moisture c...

Embodiment 2

[0034] see figure 1 and image 3 , a preparation method of laterite nickel ore pellets, comprising the steps of:

[0035] 1) Grinding and grading: Feed the laterite nickel ore 1 with a particle size of less than 350 mm into the semi-autogenous mill 2, and the discharged ore is classified by the double-layer vibrating screen 19, and the material larger than 10 mm is transported to the crusher 5 through the belt 4 and returned after crushing Semi-autogenous mill 2; materials of 3-10mm enter ball mill 9 for grinding; materials less than 3mm and the ore discharge of ball mill 9 are sent to cyclone 8 for classification through pump box 6 and slurry pump 7, and cyclone settling sand Enter the ball mill 9 to grind the ore, and the cyclone overflow is the qualified particle size (less than 0.5mm) slurry, and the moisture content of the slurry is about 65%;

[0036] 2) Concentration and dehydration: For qualified pulp, thickener 10 is used to concentrate first, and then belt filter 2...

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Abstract

The invention relates to a preparation method of laterite nickel ore pellet. The preparation method comprises the following steps of (1) feeding laterite nickel ore with the particle size less than 400mm into a first stage of mill, grading discharged ore by grading equipment A, and enabling a material larger than 10mm to return to the first stage of mill or enter a second stage of mill after crushing; enabling a material less than 10mm to enter grading equipment B for grading, enabling a material larger than 0.5mm to enter the second stage of mill, and enabling the discharged ore to return tothe grading equipment B, wherein fine fraction less than 0.5mm of ore is qualified fraction of ore pulp; (2) dehydrating the ore pulp obtained from the step A, and thus obtaining a material with the moisture content less than 40%; (3) drying the material obtained from the step B, and thus obtaining a material with the moisture suitable for pelletizing; adding a powder additive, carrying out pelletizing and screening, and enabling screen underflow to return to pelletizing operation, wherein an oversize product is qualified fraction of pellet. The preparation method has the advantages of low production cost and smooth process and is suitable for mass production.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for preparing laterite nickel ore pellets. Background technique [0002] With the depletion of nickel sulfide ore resources, the laterite nickel ore resources, which account for about 70% of the world's terrestrial nickel reserves, are playing an increasingly important role in the global nickel industry. At present, the industrial methods for extracting nickel and cobalt from laterite nickel ore are mainly pyrometallurgical methods, and most of the pyrometallurgical methods are to prepare laterite nickel ore into pellets. A major feature of mined laterite nickel ore is its high water content, generally greater than 30%. However, the current pellet preparation process is to first dry the mined laterite nickel ore, then crush it, and then dry grind and classify it. It is difficult to enlarge the production equipment, the grinding efficiency is low, and the dust pollution is seri...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B23/00B02C21/00B02C23/16
CPCB02C21/00B02C23/16B02C2023/165C22B1/2406C22B23/005
Inventor 程建国赵欢解振朝李淮湘董英择廖乾
Owner CHANGSHA RES INST OF MINING & METALLURGY
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