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Comprehensive utilization method for laterite-nickel ore

A technology of laterite nickel ore and mixture, which is applied to magnesium and aluminum, comprehensively utilizes laterite nickel ore, can solve the problems of polluting the environment, restricting the application of high-pressure acid leaching, pollution, etc.

Inactive Publication Date: 2011-07-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the high magnesium content in the ore will increase the consumption of acid, increase the production cost, and cause adverse effects on the process
In addition, high-pressure operating conditions also limit the application of high-pressure acid leaching.
Atmospheric pressure acid leaching is currently the most commonly used process for the treatment of laterite nickel ore. This process has the advantages of simple operation, low energy consumption, no use of high-pressure equipment, and low investment costs. However, the recovery rate of nickel is low and the pollution is serious.
Microbial leaching is a relatively environmentally friendly treatment method for laterite nickel ore, but there are problems such as long production cycle, high cost of microbial cultivation, and non-recyclable organic acids.
[0005] The above-mentioned methods for treating laterite nickel ore only focus on the recovery of low-content nickel in the ore, and some recover iron and cobalt, while other components are discharged as waste slag and waste liquid, which not only takes up a lot of land, but also seriously pollutes surroundings

Method used

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  • Comprehensive utilization method for laterite-nickel ore
  • Comprehensive utilization method for laterite-nickel ore
  • Comprehensive utilization method for laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] The composition of the laterite nickel ore used is mainly Ni 0.71%, Fe 10.69%, Al 2 o 3 5.42%, MgO 28.09%, SiO 2 37.85%, loss on ignition 10.15%.

[0102] Crush the laterite nickel ore, grind it down to 80 μm, mix it with sulfuric acid with a concentration of 60% in a mass ratio of 1:1.1, raise the temperature to 300 ° C, keep the temperature for 2 hours, then raise the temperature to 360 ° C, and use the flue gas produced by the reaction Sulfuric acid is absorbed and returned for roasting.

[0103] Add the roasted clinker into water, dissolve it for 1 hour, and filter. The filter residue mainly contains silicon dioxide, which can be used as a product after further removal of impurities. The filtrate mainly contains Mg 2+ , Fe 3+ , Fe 2+ 、Ni 2+ 、Al 3+ , SO 4 2- . According to the Fe contained in the filtrate 2+ The amount of hydrogen peroxide was added in excess of 10% according to stoichiometry, and after reacting for 2 hours, sodium carbonate was added to ...

Embodiment 2

[0110] The lateritic nickel ore used is mainly composed of Ni 1.52%, Fe 11.02%, MgO 28.39%, Al 2 o 3 4.32%, SiO 2 38.13%, loss on ignition 11.21%.

[0111] Crush the laterite nickel ore, grind it down to 80 μm, mix it with 80% concentrated sulfuric acid at a mass ratio of 1:1.0, raise the temperature to 280°C, keep the temperature constant for 2.5 hours, then raise the temperature to 400°C, and use sulfuric acid to remove the flue gas produced by the reaction absorbed, and returned for roasting.

[0112] Add the roasted clinker into water, dissolve it for 1 hour, and filter. The filter residue mainly contains silicon dioxide, which can be used as a product after further removal of impurities. The filtrate mainly contains Mg 2+ , Fe 3+ , Fe 2+ 、Ni 2+ 、Al 3+ , SO 4 2- . According to the Fe contained in the filtrate 2+ The amount of hydrogen peroxide was added according to stoichiometric excess of 10%. After 2 hours of reaction, sodium bicarbonate was added to the sol...

Embodiment 3

[0118] The laterite nickel ore used mainly consists of Ni 2.01%, Fe 11.17%, Al 2 o 3 4.97%, MgO 32.83%, SiO 2 29.18%, loss on ignition 10.45%.

[0119] Crush the lateritic nickel ore, grind it to below 80 μm, mix it with sulfuric acid with a concentration of 70% in a mass ratio of 1:1.3, raise the temperature to 260 ° C, keep the temperature for 3 hours, then raise the temperature to 450 ° C, and use the flue gas produced by the reaction Sulfuric acid is absorbed and returned for roasting.

[0120]Add the roasted clinker into water, dissolve it for 2 hours, filter, the filter residue mainly contains silicon dioxide, and use it as a product after treatment. The filtrate mainly contains Mg 2+ , Fe 3+ , Fe 2+ 、Ni 2+ 、Al 3+ , SO 4 2- . According to the Fe contained in the solution 2+ Add sodium chlorate in excess of 5% according to the stoichiometric amount, and after reacting for 2 hours, add sodium hydroxide to the solution, control the temperature to 90° C., and the...

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Abstract

The invention relates to an environmental-friendly comprehensive utilization method for a laterite-nickel ore, which comprises the following steps of: (1) grinding the laterite-nickel ore, mixing with sulfuric acid, roasting, dissolving out roasted clinker and filtering to obtain silicon dioxide and dissolution liquid; (2) deironing the dissolution liquid to obtain liquid No.2 and filter residue (iron compounds), wherein the liquid No.2 comprises aluminum, nickel and magnesium and can be treated by the step (3) or (4); (3) precipitating the aluminum in the liquid No.2 by using alkali, filtering, precipitating the nickel in filtrate by using sodium sulfide, filtering, precipitating the magnesium by using the alkali, and treating filter residue to obtain aluminum oxide, nickel hydroxide, nickel sulfide and magnesium oxide respectively; and (4) precipitating the aluminum and the nickel in the liquid No.2 by using the alkali, treating mixed slag containing the aluminum and the nickel by using the alkali to obtain aluminum hydroxide and nickel hydroxide products, and precipitating the magnesium in filtrate subjected to aluminum and nickel precipitation by using ammonia or ammonium saltto obtain a magnesium oxide product. The method is suitable for treating various laterite-nickel ores, three wastes (waste gas, waste water and waste residue) are not generated, and valuable components magnesium, nickel, iron, aluminum and silicon in the laterite-nickel ore are separated and extracted.

Description

technical field [0001] The invention relates to a method for processing laterite nickel ore, and a method for comprehensively utilizing laterite nickel ore to separate and extract nickel, magnesium, iron, aluminum and silicon. Background technique [0002] Laterite nickel ore is a mixture of hydrated iron oxide and hydrated magnesium silicate formed by long-term large-scale weathering, leaching, alteration, and enrichment of nickel-containing ores. It is a loose clay-like nickel oxide ore resource containing a lot of water. , easy to mine, difficult to process. At present, the usable part of lateritic nickel ore is generally divided into three layers: limonite layer, silicon magnesium nickel ore layer and the transition layer between the two. The chemical composition of laterite nickel ore varies not only from deposit to deposit, but even in the same deposit, the content of nickel, cobalt, iron, magnesium, etc. varies with the depth of the deposit, which increases the cost ...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B3/08C22B3/46C22B23/00C22B26/22C22B21/00C01G49/06
CPCY02P10/20
Inventor 翟玉春申晓毅王佳东辛海霞张杰李洁段华美吴艳牟文宁
Owner NORTHEASTERN UNIV
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