Method for leaching limonitic laterite nickel ore

A technology of lateritic nickel ore and limonite, applied in the direction of improving process efficiency, etc., can solve the problems of high equipment requirements, high impurity content in leaching liquid, poor selectivity, etc., to reduce the loss of nickel and cobalt, and improve the comprehensive utilization rate of iron , Good leaching selectivity

Inactive Publication Date: 2012-07-04
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
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  • Claims
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Problems solved by technology

Although this method requires less equipment than the conventional pressure leaching method, and the technology is easy to master, the impurity content in the obtained leaching solution is high, and the subsequent purification process is difficult. In addition, this method does not mention the recycling of iron, and the economy is not good.
[0007] In summary, the above process imp

Method used

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  • Method for leaching limonitic laterite nickel ore
  • Method for leaching limonitic laterite nickel ore

Examples

Experimental program
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Effect test

Embodiment 1

[0039]The raw ore is crushed and wet-milled to obtain lateritic nickel ore with a particle size of less than 74 μm, accounting for 75%. The mass concentration of the slurry is 30%. Concentrated sulfuric acid with a mass fraction of 98% is added. The amount of acid added is 350 kg / t dry base ore. Pre-soak at 80°C for 1 hour; after the pre-soaking, add solid magnesium nitrate at a rate of 60 kg / t dry base ore, then raise the temperature to 230°C for pressure leaching, the leaching pressure is 2.5 Mpa, and the leaching time is 5 h , the liquid-solid ratio is 3:1 ml / g, the stirring speed is 500 rpm, wherein the leaching rate of nickel is 91.2%, the leaching rate of cobalt is 92.4%, and the leaching rate of iron is as low as 0.5%; the mass concentration of gas in the kettle is 20% The magnesia slurry is absorbed, and the pH value of the leached pulp is adjusted to 4.0 with a mass concentration of 20% magnesia slurry, and then after dense separation and 5-stage dense washing with a l...

Embodiment 2

[0041] The raw ore is crushed and wet-milled to obtain lateritic nickel ore with a particle size of less than 74 μm, accounting for 78%. The mass concentration of the slurry is 42%. Concentrated sulfuric acid with a mass fraction of 98% is added. The amount of acid added is 260 kg / t dry base ore, heated to 75°C, pre-soak for 1.0 h; after the pre-soaking, add regenerated magnesium nitrate solution and magnesium nitrate solid, equivalent to a total amount of magnesium nitrate solid addition of 70 kg / t dry base ore, and then raise the temperature to 220°C for pressure leaching, the leaching pressure The leaching rate was 2.5 Mpa, the leaching time was 2 h, the liquid-solid ratio was 2:1 ml / g, and the stirring speed was 500 rpm. The leaching rate of nickel was 90.7%, that of cobalt was 91.0%, and that of iron was as low as 0.4%. The internal gas is absorbed with magnesia slurry with a mass concentration of 18%, and the leached pulp is adjusted to a pH value of 4.0 with a magnesia s...

Embodiment 3

[0043] The raw ore is crushed and wet-milled to obtain lateritic nickel ore with a particle size of less than 74 μm, accounting for 85%. The mass concentration of the slurry is 20%. Concentrated sulfuric acid with a mass fraction of 98% is added. to 60°C, pre-soak for 0.5 h; after pre-soaking, add regenerated magnesium nitrate solution and solid magnesium nitrate, equivalent to a total amount of magnesium nitrate solids added of 80 kg / t dry base ore, and then raise the temperature to 200°C for pressure leaching, the leaching pressure The leaching rate was 1.8 Mpa, the leaching time was 3 h, the liquid-solid ratio was 6:1 ml / g, and the stirring speed was 800 rpm, the leaching rate of nickel was 94.2%, the leaching rate of cobalt was 95.4%, and the leaching rate of iron was as low as 0.8%; The internal gas is absorbed with magnesia slurry with a mass concentration of 30%, and the leached pulp is adjusted to a pH value of 3.8 with a magnesia slurry with a mass concentration of 30%...

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Abstract

The invention discloses a method for leaching limonitic laterite nickel ore and relates to a process method for recovering nickel, cobalt and iron through treatment of laterite nickel ore by wet process. The method is characterized in that the technical process comprises: (1) grinding raw limonitic laterite nickel ore into fine powder, making slurry, adding sulfuric acid, heating the slurry and leaching the slurry; (2) adding Mg(NO3)2 into the pre-leached slurry, heating with stirring, pressurizing the slurry and leaching the slurry; 3) at the end of leaching, neutralizing the slurry, removing iron and aluminum from the slurry, and separating to obtain a leaching solution and a leaching residue; and 4) washing the leaching residue to obtain washing liquid and iron-enriched slag, neutralizing the leaching solution, precipitating nickel and cobalt, obtaining nickel and cobalt hydroxides, evaporating a mother solution from which nickel and cobalt are separated to crystallize magnesium sulfate and comprehensively recovering magnesium sulfate. The method realizes the high-efficiency selective leaching of nickel and cobalt, the leaching rate reaches over 90 percent, the iron leaching rate is lower than 0.8 percent and iron-enriched slag with an iron content of over 55 percent is obtained.

Description

technical field [0001] The invention discloses a limonite-type laterite-nickel ore leaching method, relating to a process method for recovering nickel, cobalt and iron by wet processing the laterite-nickel ore. Background technique [0002] Laterite nickel ore is a mineral formed by long-term weathering and leaching of nickel-containing olivine. Because the oxidation of iron after the deposit is weathered makes the ore red, it is commonly known as laterite nickel ore. According to the different contents of iron, silicon, magnesium and nickel in the deposit, lateritic nickel ore can be divided into two types: limonite-type laterite-nickel ore and silicon-magnesium-nickel ore-type laterite-nickel ore. Generally speaking, the former has lower nickel grade and iron grade Higher, suitable for wet process, the latter has relatively high nickel grade and relatively low iron grade, suitable for pyrometallurgy, and the total resource of the former is about twice that of the latter. ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B23/00
CPCY02P10/20
Inventor 王成彦马保中杨玮娇尹飞陈永强杨卜张永禄
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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