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A comprehensive treatment method for laterite nickel ore hydrometallurgy wastewater

A laterite nickel ore and comprehensive treatment technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high treatment costs, environmental pollution, and complex components of magnesium-containing aqueous solutions and other issues, to achieve the effect of low cost, avoiding environmental pollution, and simple method

Active Publication Date: 2011-12-14
广西银亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These magnesium-containing aqueous solutions have complex components and high processing costs, and are usually discarded as waste water. This will pollute the environment and is not allowed by the national environmental protection policy.

Method used

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  • A comprehensive treatment method for laterite nickel ore hydrometallurgy wastewater
  • A comprehensive treatment method for laterite nickel ore hydrometallurgy wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of magnesium-containing wastewater produced during the hydrometallurgical nickel precipitation and refining process of laterite nickel ore, the specific components are:

[0029] element Mg Ca Na mn heavy metal pH value Contentg / L 17.89 0.36 5.96 0.11 0.01 8.5

[0030] The content of Mg in the wastewater is low, so the wastewater is adjusted to pH = 7 with sulfuric acid, and then returned to the laterite nickel ore washing process as water for ore washing and pulping, and then the nickel and magnesium are leached out through the acid leaching process, and the precipitated nickel is separated to produce Magnesium-containing wastewater. After 2 cycles, the concentration of magnesium in magnesium-containing wastewater increased to 53g / L. Add the waste water to the stirring tank, raise the temperature to 60°C, analyze the heavy metal content in the waste water, add sodium sulfide according to 1.5 times the total molar mass of the ...

Embodiment 2

[0032] The composition of the magnesium-containing wastewater is the same as in Example 1. The wastewater is adjusted to pH = 7 with sulfuric acid, and then directly returned to the acid leaching process as process water to leach nickel and magnesium. The magnesium-containing wastewater produced after the nickel precipitation and separation is returned to the acid leaching process again. After 2 cycles, the concentration of magnesium in magnesium-containing wastewater increased to 50g / L. Add the waste water to the stirring tank, analyze the heavy metal content in the test waste water, add sodium sulfide according to 1.0 times the total molar mass of the heavy metal in the waste water, react at room temperature for 90 minutes, and filter to remove the heavy metal. Adjust the pH value of this aqueous solution to 8.0 with milk of lime, pass air into the aqueous solution to oxidize low-valent manganese, add a small amount of hydrogen peroxide during the process, react at room tempe...

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Abstract

The invention discloses a comprehensive treatment method of waste water from laterite-nickel ore wet smelting, which comprises the following steps: adjusting magnesium-containing waste water to be neutral so as to return the waste water to the ore-washing or leaching procedure for a process purpose, increasing the magnesium concentration of the waste water to above 50 g / L, performing heavy metal removal and manganese removal, performing negative pressure evaporation concentration, cooling crystallization, centrifugation separation, and drying to obtain magnesium sulfate heptahydrate, performing magnesium precipitation of the mother liquor after crystallization by sodium carbonate, separating basic magnesium carbonate, performing negative pressure evaporation concentration, cooling crystallization, centrifugation separation, and drying of the mother liquor after magnesium precipitation to obtain sodium sulfate decahydrate, or returning the mother liquor after magnesium precipitation directly to the iron-removing procedure of the nickel-extraction flow and to be used as a sodium source for iron removal by a sodium jarosite method. The method of the invention is simple and practical,has low cost, does not generate waste by-products, can both produce salable chemical products and reduce the production cost of the main flow for nickel recovery, and also prevents environment pollution.

Description

technical field [0001] The invention relates to a treatment method for hydrometallurgical wastewater, in particular to a comprehensive treatment method for laterite nickel ore hydrometallurgy wastewater. Background technique [0002] Lateritic nickel ore is mainly divided into three mineral components with mining value: the limonite layer on the surface, the saprolite layer above the bedrock, and the transition layer between limonite and saprolite. The nickel-containing minerals in limonite are goethite and / or hematite; the nickel-containing minerals in saprolite are mainly magnesite with high magnesium content. [0003] The content of magnesium in laterite nickel ore is generally 10 to 20 times that of nickel. In the wet nickel extraction metallurgical process of lateritic nickel ore, limonite-type lateritic nickel ore is generally leached with high acid, and then the residual acid in the leaching solution is neutralized with silicon-magnesium-nickel ore slurry. During th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F5/40C01F5/24C01D5/00
Inventor 肖万林王多冬周建平苏桂华付海阔李海燕容仕甲
Owner 广西银亿新材料有限公司
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