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Method for comprehensive exploitation and utilization of silicon, magnesium, iron, and nickel in laterite-nickel ore

A technology of lateritic nickel ore and roasting method, which is applied in the direction of nickel oxide/nickel hydroxide, magnesium oxide, iron oxide, etc., can solve the problems that organic acids cannot be recycled, affect the process flow, and the production cycle is long, etc., and achieve high added value The effect of comprehensive utilization, simple process and simple equipment

Inactive Publication Date: 2011-06-01
NORTHEASTERN UNIV
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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 treatment processes only focus on the recovery of nickel with low content in the ore, some recover iron and cobalt, and other substances are discharged as waste residues, which not only occupy a large amount of land, but also bring huge harm to the ecological environment and serious safety hazards Hidden danger, but also a waste of resources

Method used

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  • Method for comprehensive exploitation and utilization of silicon, magnesium, iron, and nickel in laterite-nickel ore
  • Method for comprehensive exploitation and utilization of silicon, magnesium, iron, and nickel in laterite-nickel ore
  • Method for comprehensive exploitation and utilization of silicon, magnesium, iron, and nickel in laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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%.

[0045] Mix the laterite nickel ore that is ground to below 80 μm with solid NaOH at a mass ratio of 1:3, roast at 500°C for 4 hours, then stop heating, and when the temperature is lowered to 120°C, take out the clinker, add 4 times the volume of water, and bake at 85°C After boiling and dissolving for 40 minutes at ℃, filter, the filtrate is sodium silicate solution, and the filter cake is 1 # scum.

[0046] Heat the sodium silicate solution to 80°C, under the condition of stirring, pass carbon dioxide gas at a flow rate of 100ml / min, first adjust the pH to 13, filter and separate, remove the silica precipitate with high impurity content, and then continue to pass Carbon dioxide was added to adjust the pH value of the solution to 9, and filtered to obtain a sodium ca...

Embodiment 2

[0051] 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%.

[0052] The laterite nickel ore that is ground to below 80μm and solid Na 2 CO 3 Mix according to the mass ratio of 1:3, roast at 1200°C for 3 hours, then stop heating, when the temperature drops to 100°C, take out the clinker, add 3 times the volume of water, boil and dissolve at 80°C for 60min, then filter, the filtrate is sodium silicate solution, filter cake is 1 # scum. The carbon dioxide gas generated during the roasting process is collected as raw material for the carbonization process.

[0053] Heat the sodium silicate solution to 85°C, under stirring conditions, pass in carbon dioxide gas at a flow rate of 150ml / min, first adjust the pH to 13, filter and separate, remove the silica precipitate with high impurity content, and then continue to pass in carbo...

Embodiment 3

[0058] 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%.

[0059] Mix the laterite nickel ore that is ground below 80 μm with solid NaOH at a mass ratio of 1:4, roast at 475°C for 5 hours, then stop heating, and when the temperature is lowered to 100°C, take out the clinker, add 3 times the volume of water, and After boiling at 80°C for 60 minutes, filter, the filtrate is sodium silicate solution, and the filter cake is 1 # scum.

[0060] Heat the sodium silicate solution to 90°C, under the condition of stirring strength, pass carbon dioxide gas at a flow rate of 100ml / min, first adjust the pH to 13, filter and separate, remove the silica precipitate with high impurity content, and then continue Add carbon dioxide until the pH value of the solution drops to 9, and filter to obtain sodium carbonate solution and filter cake. ...

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Abstract

A method for comprehensive exploitation and utilization of silicon, magnesium, iron, and nickel in laterite-nickel ore comprises the following steps: roasting laterite-nickel ore with alkali, soaking in water and filtering the roasted clinkers to obtain a sodium silicate solution; processing the sodium silicate solution by carbonation decomposition method to prepare silica, processing the filter residues by carbonization and leaching to obtain a magnesium bicarbonate solution; performing thermal decomposition to prepare magnesium carbonate, allowing residual filter residues to react with ammonium carbonate, filtering, processing the filtrate by ammonia distillation and calcination to prepare nickel oxide. Residual residues are mainly ferric oxide containing a few impurities, and the residues can be used as raw materials for ironmaking, or can be deep processed to prepare products with high added value. The invention is suitable for processing various laterite-nickel ore, has the advantages of simple process flow and simple equipment, realizes the high-added-value, green and comprehensive utilization of laterite-nickel ore resources and the recycling utilization of chemical raw materials, is free of discharge of waste residues, waste liquids, or waste gases, 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 silicon, magnesium, iron and nickel elements from laterite nickel ore, and preparing silicon dioxide, magnesium oxide, iron oxide and nickel oxide products to realize laterite nickel The method for the comprehensive development and utilization of ore belongs to the field of non-ferrous 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 nic...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B1/02C22B3/04C22B3/14C01B33/12C01F5/02C01G49/06C01G53/04
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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