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Method for preparing magnesia, silicon dioxide and nickel oxide products from lateritic nickel ore

A technology of laterite nickel ore and silicon dioxide, applied in the directions of silicon dioxide, magnesium oxide, silicon oxide, etc., can solve the problems of long production cycle, increased acid consumption, and high cost of microbial culture, and achieves simple equipment, low cost, and high technology. Simple process effect

Inactive Publication Date: 2009-09-09
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This process is only suitable for lateritic nickel ore with low magnesium content, because high magnesium content in the ore will increase acid consumption, increase production costs, 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 process is currently a popular direction in the research of lateritic nickel ore treatment process. It has the advantages of simple process, low energy consumption, no use of autoclave, low investment cost, and simple operation. However, the content of nickel in the leaching slag is high 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 nickel with a low content in the ore, and some recover iron and cobalt, while other substances are discharged as waste residues, which not only occupy a large amount of land, but also seriously pollute the environment

Method used

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  • Method for preparing magnesia, silicon dioxide and nickel oxide products from lateritic nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The composition of the laterite nickel ore used is: NiO 0.93%, SiO 2 40.74%, MgO 21.53%, Fe 2 o 3 18.82%, Al 2 o 3 4.45%, CaO 0.62%, Cr 2 o 3 0.56%, other impurities 0.72%, loss on ignition 11.63%.

[0038] The laterite nickel ore that has been crushed and ground to less than 80 μm is mixed evenly with ammonium sulfate at a molar ratio of 1:3, kept at 500°C for 5 hours, and roasted. The gas released during the reaction is absorbed by water. The roasted product is cooled, dissolved in water, and then separated into solid and liquid. Filtrate is magnesium sulfate solution, and filter residue is 1 # scum.

[0039] Evaporate and concentrate the magnesium sulfate solution to obtain magnesium sulfate heptahydrate. Magnesium sulfate heptahydrate is dehydrated at 300°C for 3 hours, and then heated to 1200°C for 5 hours to obtain magnesium oxide. After inspection, it reaches the HG / T 2573-94 industrial magnesium oxide standard.

[0040] Will 1 # Mix the slag and so...

Embodiment 2

[0045] The composition of the laterite nickel ore used is: NiO 1.32%, SiO 2 37.88%, MgO 23.61%, Fe 2 o 3 19.88%, Al 2 o 3 4.95%, CaO 0.58%, Cr 2 o 3 0.62%, other impurities 0.52%, loss on ignition 10.64%.

[0046] The laterite nickel ore that has been crushed and ground to less than 80 μm is mixed evenly with ammonium sulfate at a molar ratio of 1:4, kept at 450°C for 6 hours, and roasted. The gas released during the reaction is absorbed by water. The roasted product is cooled, dissolved in water, and then separated into solid and liquid. Filtrate is magnesium sulfate solution, and filter residue is 1 # scum.

[0047] Evaporate and concentrate the magnesium sulfate solution to obtain magnesium sulfate heptahydrate, dehydrate the magnesium sulfate heptahydrate at 400°C for 2 hours, then raise the temperature to 1300°C and calcinate for 4 hours to obtain magnesium oxide. After inspection, it reaches the HG / T 2573-94 industrial magnesium oxide standard.

[0048] Will...

Embodiment 3

[0053] The composition of the laterite nickel ore used is: NiO 1.73%, SiO 2 42.57%, MgO 20.31%, Fe 2 o 3 18.66%, Al 2 o 3 3.87%, CaO 0.68%, Cr 2 o 3 0.52%, other impurities 0.86%, loss on ignition 10.8%.

[0054] The laterite nickel ore that has been crushed and ground to less than 80 μm is mixed evenly with ammonium sulfate at a molar ratio of 1:5, kept at 600°C for 4 hours, and roasted. The gas released during the reaction is absorbed by water. The roasted product is cooled, dissolved in water, and then separated into solid and liquid. Filtrate is magnesium sulfate solution, and filter residue is 1 # scum.

[0055] Evaporate and concentrate the magnesium sulfate solution to obtain magnesium sulfate heptahydrate, dehydrate the magnesium sulfate heptahydrate at 500°C for 2 hours, and then heat up to 1400°C for 3 hours to obtain magnesium oxide. After inspection, it reaches the HG / T 2573-94 industrial magnesium oxide standard.

[0056] Will 1 # The slag and the so...

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Abstract

The invention relates to a method for preparing magnesia, silicon dioxide and nickel oxide products from lateritic nickel ores. The method comprises the following steps: (1), crushing, grinding and roasting the lateritic nickel ores with ammonium sulfate; (2), dissolving and filtering roasted products; (3), evaporating, condensing and crystallizing filtrate to prepare magnesium sulfate; (4), dehydrating and calcining the magnesium sulfate to prepare magnesia; (5), reacting filter residue with an alkaline solution or molten caustic soda, leaching and filtering the product of reaction to obtain a sodium silicate solution; (6), carbonizing, decomposing, filtering, washing and drying the sodium silicate solution to prepare the silicon dioxide; (7), leaching and filtering the residual filter residue by an ammonium carbonate solution; and (8), distilling ammonia from the filtrate and calcining the filtrate to prepare the nickel oxide. The residual residue is ferric oxide containing a small amount of impurities and can be used as an iron-making raw material or deep processed into a product with a high added value. The method is suitable for processing various lateritic nickel ores, has simple technological process and simple and convenient equipment, does not emit solid, liquid and gas waste or cause secondary pollution and uses lower cost to realize the high added value comprehensive utilization of lateritic nickel ore resources.

Description

technical field [0001] The invention relates to a method for processing laterite nickel ore, in particular to a method for preparing magnesium oxide, silicon dioxide and nickel oxide products from laterite nickel ore. Background technique [0002] Laterite nickel ore is a mixture of hydrated iron oxide, water and 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 with a large amount of water. Mineral resources are easy to mine but 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 cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/12C01B33/12C01G53/04
Inventor 翟玉春牟文宁刘岩吴艳解淑倩赵昌明许茜
Owner NORTHEASTERN UNIV
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