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Method for extracting nickel oxide from lateritic nickel

A technology for laterite nickel ore and nickel oxide is applied in the field of extracting nickel oxide from laterite nickel ore and processing laterite nickel ore, which can solve the problems of high microbial culture cost, long production cycle, influence on technological process and the like, and achieves low cost and simple equipment. , the effect of simple process

Inactive Publication Date: 2009-05-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this process is only suitable for lateritic nickel ore with low magnesium content, because high magnesium content in the ore will increase acid consumption and affect the process flow
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 processing lateritic nickel ore are all focused on recovering the nickel therein, some have recovered iron and cobalt, and other substances have been discharged as waste residues, seriously polluting the environment

Method used

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  • Method for extracting nickel oxide from lateritic nickel
  • Method for extracting nickel oxide from lateritic nickel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The composition of the laterite nickel ore used is: NiO 0.91%, SiO 2 38.74%, MgO 22.53%, Fe 2 o 3 19.82%, Al 2 o 3 4.65%, CaO 0.62%, Cr 2 o 3 0.55%, other impurities 0.78%, loss on ignition 11.4%.

[0038] Mix the laterite nickel ore that is ground to less than 80 μm and solid sodium hydroxide at a mass ratio of 1:3, react at 500°C with stirring for 30 minutes, then stop heating, and when the temperature is lowered to 90°C, add 4 times the volume of water , boiled and dissolved at 85°C for 40 minutes, filtered, the filtrate was sodium silicate solution, and the filter cake was 1 # scum.

[0039] The sodium silicate solution was heated to 80°C, and under stirring conditions, carbon dioxide gas was introduced at a flow rate of 100ml / min until the pH value of the solution dropped to 9, and then filtered to obtain sodium carbonate solution and filter cake. After the filter cake is washed to neutral, it is dried at 60° C. for 10 hours to obtain a silica powder wit...

Embodiment 2

[0044] The composition of the laterite nickel ore used is: NiO 1.03%, SiO 2 40.57%, 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 13.65%.

[0045] Mix the laterite nickel ore that is ground to less than 80 μm and the sodium hydroxide solution with a concentration of 75% at a mass volume ratio (g:ml) of 1:5, and react for 1.5 hours at 225°C with stirring, and then stop heating. Cool down to 80°C, add 5 times the volume of water to dilute, continue leaching at 85°C for 20 minutes, filter and separate, the filtrate is sodium silicate solution, and the filter cake is 1 # scum.

[0046] The sodium silicate solution was heated to 85°C, and under stirring conditions, carbon dioxide gas was introduced at a flow rate of 150ml / min until the pH value of the solution dropped to 8.5, and filtered to obtain sodium carbonate solution and filter cake. After the filter cake is washed to neutral, it is dried at 70° C....

Embodiment 3

[0051] The composition of the laterite nickel ore used is: NiO 1.21%, SiO 2 36.88%, MgO 24.63%, Fe 2 o 3 21.95%, Al 2 o 3 5.05%, CaO 0.57%, Cr 2 o 3 0.61%, other impurities 0.46%, loss on ignition 12.05%.

[0052] Mix the laterite nickel ore that is ground to less than 80 μm and the sodium hydroxide solution with a concentration of 85% at a mass volume ratio (g:ml) of 1:4, and react for 1 hour at 250°C with stirring, then stop heating and cool down When the temperature reaches 90°C, add 3 times the volume of water to dilute, continue leaching at 80°C for 30 minutes, then filter, the filtrate is sodium silicate solution, and the filter cake is 1 # scum.

[0053] Heat the sodium silicate solution to 90°C, under the condition of strong stirring, pass carbon dioxide gas at a flow rate of 100ml / min until the pH value of the solution drops to 9, filter to obtain sodium carbonate solution and filter cake. After the filter cake is washed to neutral, it is dried at 70°C for ...

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Abstract

The invention provides a method for extracting nickel oxide from lateritic nickel ores. The method comprises the following steps: the lateritic nickel ores are adopted to react with alkali; an obtained sodium silicate solution is used for preparing silicon dioxide through carbonization and decomposition; filter residue is carbonized and leached so as to obtain a magnesium bicarbonate solution; the magnesium bicarbonate solution is heated and decomposed so as to obtain magnesium carbonate; the remaining filter residue reacts with ammonium carbonate and then is filtered; and the nickel oxide is prepared from filtrate through ammonia distillation and calcinations. The remaining filter residue is mainly ferric oxide containing a few impurities, and can be used as an ironmaking raw material or to be deeply processed into the products with high additional value. The method has the advantages that the method is suitable for treating various lateritic nickel ores, simple in process flow and convenient in equipment, realizes the high-additional-value environment-friendly comprehensive utilization of lateritic nickel ore resources and the recycling of chemical raw materials, emits no waste residue, waste liquid or waste gas, and meets the requirements of industrial production.

Description

technical field [0001] The invention relates to a method for processing laterite nickel ore, in particular to a method for extracting nickel oxide from laterite nickel ore, and belongs to the field of nonferrous metal hydrometallurgy. Background technique [0002] The world's land-based nickel reserves are about 620 million tons, of which 30% exist in the form of nickel sulfide ore, and 70% exist in the form of laterite nickel ore. At present, about 60% of nickel in the world is extracted from nickel sulfide ore, but with the continuous increase of nickel demand and the gradual decrease of available nickel sulfide ore resources, the economic development of laterite nickel ore has become the key point of nickel metallurgy today. Research hotspots. [0003] Laterite nickel ore is formed by long-term weathering, leaching, alteration and enrichment of nickel-containing ore. It is a loose clay-like ore composed of iron, aluminum, silicon and other hydrous oxides. The lateritic ...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/12C22B3/14C01G53/04
CPCY02P10/20
Inventor 翟玉春刘岩牟文宁吴艳解淑倩赵昌明许茜
Owner NORTHEASTERN UNIV
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