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Method for removing iron and enriching nickel cobalt through precipitation of laterite type nickel ores

A technology of laterite nickel ore and nickel-cobalt, applied in the direction of improving process efficiency, etc., can solve the problems of difficult separation and utilization of base metals, high energy consumption of hydrochloric acid regeneration, etc., to solve the difficult separation of base metal elements, improve recovery rate, reduce The effect of production costs

Inactive Publication Date: 2009-11-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for iron removal and enrichment of nickel and cobalt by precipitation of laterite nickel ore in view of the difficulties in the separation and utilization of base metals in the traditional acid leaching process and the large energy consumption of hydrochloric acid regeneration.

Method used

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  • Method for removing iron and enriching nickel cobalt through precipitation of laterite type nickel ores

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The laterite nickel ore is ball-milled and passed through a 50-mesh sieve, and 500 grams of -50-mesh ore sample is leached with hydrochloric acid, so that the concentration of Fe in the leachate is 0.1mol / L, and a sufficient amount of sodium peroxide solution (1mol / L ), then add phosphoric acid (1mol / L) equimolar to Fe, adjust the pH=2.5±0.1 with sodium hydroxide solution (0.5mol / L), react in a stirred reactor at 50°C for 5min, and wash the resulting precipitate, Filtrate, and recover the regenerated hydrochloric acid to the leaching process for recycling. Hydrogen sulfide was added to the filtrate, reacted for 1 hour, and a nickel-cobalt-rich precipitate of sulfide was obtained after solid-liquid separation. After analysis, from the ore to the completion of sulfide precipitation, the comprehensive recovery rate of nickel and cobalt: Ni 93.32%; Co80.97%.

Embodiment 2

[0024] The laterite nickel ore is ball-milled and passed through a 50-mesh sieve, and 500 grams of -50-mesh ore samples are taken and leached with hydrochloric acid, so that the concentration of Fe in the leach solution is 1mol / L, and a sufficient amount of hydrogen peroxide solution (0.01mol / L) is added to the solution, Then add triammonium phosphate (0.01mol / L) equimolar to Fe, adjust pH=2.0±0.1 with sodium hydroxide solution (6mol / L), react in a stirred reactor at 40°C for 5min, and wash the resulting precipitate, Filtrate, and recover the regenerated hydrochloric acid to the leaching process for recycling. Hydrogen persulfide was added to the filtrate, reacted for 24 hours, and a nickel-cobalt-rich precipitate of sulfide was obtained after solid-liquid separation. After analysis, from the ore to the completion of sulfide precipitation, the comprehensive recovery rate of nickel and cobalt is: Ni 90.83%; Co 78.51%.

Embodiment 3

[0026] The laterite nickel ore is ball-milled and crossed a 50-mesh sieve, and 500 grams of -50-mesh ore sample is leached with hydrochloric acid, so that the concentration of Fe in the leachate is 0.01mol / L, and a sufficient amount of potassium permanganate solution (9mol / L L), then add ammonium dihydrogen phosphate (9mol / L) equimolar with Fe, adjust pH=0.1 ± 0.1 with sodium hydroxide solution (0.01mol / L), react 5min in the stirring reactor of 30 ℃, will The obtained precipitate is washed, filtered, and the regenerated hydrochloric acid is recovered to the leaching process for recycling. Add sodium hydrosulfide to the filtrate, react for 1 minute, and obtain nickel-cobalt-enriched sulfide precipitate after solid-liquid separation.

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Abstract

The invention relates to a method for removing iron and enriching nickel cobalt through precipitation of laterite type nickel ores, which is characterized in that: performing ball milling on the laterite type nickel ores, sieving the laterite type nickel ores through 50 mesh sieves, sampling a 50 mesh ore sample, using a hydrochloric acid to leach out the 50 mesh ore sample, driving the Fe concentration in lixivium to between 0.01 and 6 mol / L, and adding an oxidant and a precipitator into a solution, wherein the concentration of the oxidant and the precipitator is between 0.01 and 9 mol / L; using 0.01 to 6 mol / L of aqueous alkali to control the pH value of the system to between 0.1 and 6.0, performing reaction on the system in a stirring reactor at the temperature of between 20 and 90 DEG C for 1 minute to 24 hours, obtaining deposit after solid-liquid separation, regenerating the hydrochloric acid during iron removal through precipitation, returning the regenerated hydrochloric acid to the leaching procedure for recycling; and adding a sulfidizer into filtrate for sulfidization and precipitation, and finally realizing the effective enrichment of nickel and cobalt. The invention discards the conventional pyrohydrolysis or high-temperature roasting method, reduces the energy consumption of removal of iron and regeneration of the hydrochloric acid, and has the advantages of simple technological process, high recovery rate of nickel cobalt, good byproduct quality, stability, low cost and the like.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and relates to a method for iron removal and enrichment of nickel and cobalt by precipitation of laterite nickel ore. technical background [0002] Laterite nickel ore is a kind of nickel oxide ore, accounting for more than 65% of the total nickel reserves. Lateritic nickel ore can be divided into limonite type and silicon magnesium nickel ore type. The limonite type is located in the upper part of the deposit, with high iron, low nickel, low silicon and magnesium, but relatively high cobalt content, and should be treated by hydrometallurgy. The silicon-magnesium-nickel ore is located in the lower part of the deposit. The content of silicon and magnesium is relatively high, the content of iron and cobalt is relatively low, but the content of nickel is relatively high, so it should be treated by pyrometallurgy. The ore in the middle transition can adopt pyrometallurgy or hydrometallurgy. ...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/10C22B3/46
CPCY02P10/20
Inventor 李新海李灵均王志兴伍凌郭华军胡启阳彭文杰张云河
Owner CENT SOUTH UNIV
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