A method for separating and enriching ferronickel from laterite nickel ore

A technology for separation and enrichment of laterite nickel ore, applied in magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems of low recovery rate of Ni in concentrate, large amount of additives, low grade of ferronickel concentrate, etc. Achieve good comprehensive recovery effect of ferronickel, small dosage of additives and high comprehensive recovery rate of ferronickel

Inactive Publication Date: 2016-01-20
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw ore of this method needs to be finely ground; the amount of additives added is large and the cost is high; the grade of the product ferronickel concentrate is low, and the recovery rate of Ni in the concentrate is low

Method used

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  • A method for separating and enriching ferronickel from laterite nickel ore
  • A method for separating and enriching ferronickel from laterite nickel ore
  • A method for separating and enriching ferronickel from laterite nickel ore

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Experimental program
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Effect test

Embodiment 1

[0049] Residual ore-type lateritic nickel ore (TFe16.32%, Ni1.37%), crushed to -5mm, accounting for 90%, adding 3% sodium fluoroborate and 8% bituminous coal to make pellets, pellets at a temperature of 1200 ° C Metallized reduction roasting for 2 hours, water quenching of the reduction product, the scanning electron microscope SEM picture is shown in figure 2 , the nickel-iron alloy is spherical and emulsion-shaped, with a particle size of 0.5~10μm; after crushing and grinding to -0.074mm, it accounts for 83%, and magnetic separation with a magnetic field strength of 200mT, the obtained concentrate is Ni5.51%, Fe58.43% , the recovery rate of concentrate Ni is 88.28%, and the recovery rate of Fe is 78.31%. After grinding to -0.045mm, it accounts for 85%. Magnetic separation with a magnetic field strength of 100mT, the concentrate Ni6.75%, Fe66.70%, the concentrate Ni recovery rate 90.18%, Fe recovery rate 74.66%.

Embodiment 2

[0051] Residual ore-type lateritic nickel ore (TFe16.32%, Ni1.37%), crushed to -5mm, accounting for 90%, adding 3% sodium fluoroborate, 2% polyacrylamide, 8% bituminous coal to make pellets, pellets The ore was metallized and reduced roasted at 1200°C for 2 hours, and the reduction product was quenched in water. The SEM image of the scanning electron microscope is shown in image 3 , the nickel-iron alloy is distributed in a worm-like and reticular shape, with a long diameter of 20-200 μm; after crushing and grinding to -0.074mm, it accounts for 80%, and magnetic separation with a magnetic field strength of 200mT, a rough concentrate with a yield of 19.13% is obtained, of which Ni8 .31%, Fe77.16%, Ni recovery rate 94.35%, Fe recovery rate 82.31%; rough concentrate secondary grinding to -0.045mm accounts for 80%, and concentrate Ni8.68%, Fe80.07%, two The Ni recovery rate of the stage magnetic separation is 99.3%, and the Fe recovery rate is 98.6%.

Embodiment 3

[0053] Limonite-type lateritic nickel ore (TFe39.32%, Ni0.88%), broken to -5mm accounted for 88%, added 4% magnesium fluoroborate, 0.5% polyacrylamide, 1% montmorillonite, 20% The lignite semi-coke pellets were made, and the pellets were metallized and reduced to roast at 1150°C for 1.5 hours, the reduction products were quenched in water, and the calcined sand was crushed and ground to -0.074mm, accounting for 85%, and magnetically separated with a magnetic field strength of 80mT. The ferronickel concentrate containing Ni2.07%, Fe89.38% was obtained, and the concentrate Ni recovery rate was 95.78%, and the Fe recovery rate was 91%.

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Abstract

The invention discloses a method for separating and gathering ferro-nickel from a laterite-nickel ore, and relates to a method for separating and gathering ferro-nickel by adopting a metallized reduction method. The method is characterized by orderly comprising the following process steps: (1) crushing a raw ore; (2) adding an accelerator, a gathering agent and a reducing agent to mix and pelletize, so as to form a pellet; (3) carrying out metallized reduction roasting on the pellet; (4) calcining, water quenching and levigating; (5) magnetically roughing; (6) grinding rough concentrate; (7) magnetically selecting, so as to obtain nickel iron concentrate. By adopting the method disclosed by the invention, borofluoride is added to intensify and restore, and prompt roasting to form a local slight soluble region in the roasting process; a hole formed by adding the gathering agent provides a track for migration of ferro-nickel alloy, and prompts migration and growth of the ferro-nickel alloy, so that the ferro-nickel alloy is produced in a worm state, a net state or a bar state in the roasting process, ore grinding and magnetic separating of roasting are facilitated, the product is high in quality, good in comprehensive recovery effect of ferro-nickel, simple in technological flow, wide in selectivity of main equipment, less in energy consumption, less in adding amount, low in cost and friendly to environment.

Description

technical field [0001] A method for separating and enriching ferronickel from laterite nickel ore relates to a method for separating and enriching ferronickel by using a metallization reduction method. Background technique [0002] Nickel is an important strategic material, which is widely used in stainless steel, alloy steel, special alloys, electroplating, petrochemical catalysts, battery materials and other fields. Among them, the demand for nickel in stainless steel production accounts for 65% of the global nickel demand. Laterite nickel ore reserves account for 72% of global nickel resources, and currently about 50% of metallic nickel is extracted from sulfide ores. With the gradual reduction of nickel sulfide ore resources and the development of ferronickel industry, the economic development of laterite nickel ore has been paid more and more attention by people. [0003] According to the distribution of ore beds and the content of iron and magnesium in the ore, lateri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B5/02B03C1/00
Inventor 王成彦尹飞揭晓武陈永强杨永强王振文阮书锋杨卜郜伟邢鹏居中军李强王军张永禄柳杨
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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