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Method for preparing nickel oxide, magnesium oxide and silicon oxide products from laterite-nickel ore

A technology of lateritic nickel ore and silicon dioxide, which is applied in the direction of nickel oxide/nickel hydroxide, silicon dioxide, magnesium oxide, etc., can solve the problems of high equipment requirements, difficult control of operating conditions, and limitation of magnesium content, etc., and achieve technological process The effect of simple and high value-added comprehensive utilization

Inactive Publication Date: 2012-04-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hu Qiyang and others studied the process of comprehensive development and utilization of nickel, cobalt, iron and magnesium in laterite nickel ore. Wang Chengyan and others invented a treatment method for high-magnesium laterite nickel ore. These two new processes for the comprehensive utilization of laterite nickel ore Although from the perspective of developing a circular economy, elements such as nickel, cobalt, magnesium, and iron in the ore are used, and the recycling of raw materials is considered, hydrochloric acid and nitric acid are used as leaching agents in the process, which requires high equipment and operation. Conditions are not easy to control
In addition, the acid treatment process still limits the magnesium content in the ore, and the higher content of silicon in the laterite nickel ore is not utilized, and there is a waste residue discharge problem

Method used

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  • Method for preparing nickel oxide, magnesium oxide and silicon oxide products from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The composition of the laterite nickel ore used is: NiO 1.13%, SiO 2 41.74%, MgO 21.53%, Fe 2 o 3 18.82%, CaO 0.62%, Cr 2 o 3 0.56%, loss on ignition 11.63% other balance.

[0038] Mix the laterite nickel ore that has been crushed and ground to less than 80 μm and ammonium sulfate in a molar ratio of 1:3, dry and dehydrate at 150°C, and heat to 450°C for 5 hours. The ammonia and sulfur trioxide generated during the reaction process are dilute Sulfuric acid is absorbed to prepare ammonium sulfate solution, and ammonium sulfate crystals are prepared through evaporation, concentration and crystallization, which are used as raw materials for laterite nickel ore roasting. The roasted material was cooled, dissolved in 3 times the mass of water at 80°C for 40 minutes, and filtered to obtain the filtrate and 1# filter residue. The filtrate contains Ni 2+ , Fe 3+ , Fe 2+ , Mg 2+ , NH 4 + , SO 4 2- solution, and 1# filter residue as micro-silica fume product.

[...

Embodiment 2

[0044] 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%.

[0045] Mix the crushed and finely ground laterite nickel ore with ammonium sulfate at a molar ratio of 1:5, dry and dehydrate at 200°C, and heat to 400°C for 6 hours. The ammonia and sulfur trioxide generated during the reaction process are dilute Sulfuric acid absorption, preparation of ammonium sulfate solution, evaporation, concentration, and crystallization to prepare ammonium sulfate crystals, which are used as raw materials for laterite nickel ore roasting. The calcined material was cooled, dissolved in 5 times the mass of water at 85°C for 30 minutes, and filtered to obtain the filtrate and 1# filter residue. The filtrate contains Ni 2+ , Fe 3+ , Fe 2+ , Mg 2+ , NH 4 + , SO 4 2- solution, and the 1# filter residue is directly used as micro-silica fum...

Embodiment 3

[0051] The composition of the laterite nickel ore used is: NiO 2.52%, SiO 2 38.83%, MgO 22.42%, Fe 2 o 3 19.71%, Al 2 o 3 4.27%, CaO 0.53%, Cr 2 o 3 0.46%, other impurities 0.78%, loss on ignition 10.48%.

[0052] Mix the laterite nickel ore that has been crushed and ground to less than 80 μm and ammonium sulfate in a molar ratio of 1:4, dry and dehydrate at 150°C, and heat to 500°C for 4 hours. The ammonia and sulfur trioxide generated during the reaction process are dilute Sulfuric acid absorption, preparation of ammonium sulfate solution, evaporation, concentration, and crystallization to prepare ammonium sulfate crystals, which are used as raw materials for laterite nickel ore roasting. The roasted material was cooled, dissolved in 3 times the mass of water at 80°C for 40 minutes, and filtered to obtain the filtrate and 1# filter residue. The filtrate contains Ni 2+ , Fe 3+ , Fe 2+ , Mg 2+ , NH 4 + , SO 4 2- solution, and the 1# filter residue is directly...

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Abstract

The invention discloses a comprehensive development and utilization method of silicon, magnesium, iron, and nickel in laterite-nickel ore. According to the invention, laterite-nickel ore and ammonium sulfate are mixed and baked; the clinker obtained by baking is subject to water leaching and filtering, such that a filter residue and a solution are obtained; the filter residue is directly adopted as silicon micro-mist, and the filtrate is used for extracting iron, nickel, and magnesium. When the filtrate is oxidized, iron and nickel are precipitated by using ammonia water or ammonia gas; the filtrate is filtered, such that a mixed residue of iron hydroxide and nickel hydroxide, and an ammonium magnesium sulfate solution are obtained. The mixed residue is leached by using ammonium carbonate or ammonium bicarbonate, and the leachate is filtered, such that a nickel-ammonia complex solution and iron hydroxide are obtained. Iron hydroxide is adopted as a raw material for making iron. Ammonia is removed by evaporation from the nickel-ammonia complex, such that nickel carbonate hydroxide is obtained; nickel carbonate hydroxide is calcined, such that a nickel oxide product is obtained. Magnesium in the ammonium magnesium sulfate solution is precipitated by using ammonia water or ammonia gas, such that magnesium hydroxide and magnesium carbonate are obtained; magnesium hydroxide and magnesium carbonate are calcined, such that a magnesium oxide product is obtained.

Description

technical field [0001] The invention relates to a method for processing laterite nickel ore, in particular to a method for preparing nickel oxide, magnesium oxide and silicon dioxide products from laterite nickel ore. Background technique [0002] Laterite nickel ore is a mixture of hydrated iron oxide and hydrated magnesium silicate formed by long-term weathering, leaching, alteration, and enrichment of nickel-containing ores. It is a loose clay-like nickel oxide ore resource with a large amount 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 lateritic nickel ore varies not only from deposit to deposit, but even in the same deposit, the content of nickel, cobalt, iron, magnesium, etc. also varies with the depth of the deposit. Depending on its chemical composition,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01F5/02C01B33/12
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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