Vitriol intensified leach extraction method for nickel oxide ore

A technology of intensified leaching and nickel oxide ore, applied in the direction of improving process efficiency, etc., can solve the problems of high equipment performance requirements, waste of nickel resources, low leaching rate, etc., and achieve the effect of low price, increased leaching rate, and high leaching rate

Inactive Publication Date: 2007-07-11
潘继红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is exactly to overcome above-mentioned high temperature above 200 ℃, high pressure above 3.0Mpa, large investment, high deficiencies in equipment performance requirements; at the same time to overcome its low leaching rate and low yield under normal temperature and normal pressure, The disadvantage of large waste of nickel resources, and provide a nickel oxide ore sulfuric acid enhanced leaching extraction method with less investment, easy operation, high leaching rate, saving and making full use of nickel resources, and short production cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Crush the nickel oxide ore to a particle size of about 1mm, make a slurry with a concentration of 35%, and inject it into the reactor. Anhydrous sodium sulfite is used to carry out intensive leaching under heating, pressure and stirring, and the temperature is controlled at about 180°C and the pressure is below 1.6Mpa. Then settle naturally, carry out solid-liquid separation, and separate out the leachate. Add 3 times the weight of nickel metal sodium sulfide to the leaching solution to precipitate nickel ions in the form of nickel sulfide, concentrate and filter to obtain nickel concentrate products.

Embodiment 2

[0012] The previous leaching process is the same as in Example 1. After the solid-liquid separation of the leached pulp, sodium hydroxide with 3 times the weight of nickel metal is added to the leaching solution, and the nickel ions are precipitated in the form of nickel hydroxide, concentrated and filtered to obtain nickel concentrate. product.

Embodiment 3

[0014] The preceding leaching process is the same as in Example 1. After the leached pulp is separated from the solid and liquid, sodium carbonate with 3 times the weight of nickel metal is added to the leaching solution, and the nickel ions are precipitated in the form of nickel carbonate, concentrated and filtered to obtain the nickel concentrate product.

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PUM

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Abstract

The invention discloses an extracting method of nickel, which comprises the following steps: breaking nickel oxide into small blocks; pouring ore pulp with density at 20-60% into autoclave; adding sulfuric acid and reducer; heating; pressurizing; heating; reinforcing the leach; controlling the temperature between 100 and 200 deg. c; controlling the pressure below 1. 6Mpa; sedimenting leached liquid to obtain nickel through solid sediment agent; or extracting leached liquid; separating nickel out of liquid; condensing; purifying; obtaining the electrodeposited nickel or nickel sulfate.

Description

Technical field [0001] The invention relates to a method for extracting nickel element from nickel oxide ore by sulfuric acid leaching. Background technique [0002] At present, the method of recovering nickel metal from nickel oxide ore mostly adopts roasting-ammonia leaching or reduction-acid leaching. There are also sulfuric acid extraction ("Nonferrous Metal Extraction Metallurgy Handbook (Copper Nickel Volume)", Metallurgical Press, first edition in July 2000, P724~727), but the method used must be at high temperature (249 ℃) ) can be leached under high pressure (3.4Mpa), and the leaching solution needs to be heated and pressurized with hydrogen sulfide gas to recover nickel metal. The one-time investment of this method is very high, and it is necessary to build a high-temperature and high-pressure reactor and a huge boiler. In the recovery of nickel metal after leaching, it is necessary to produce hydrogen sulfide gas for precipitation of nickel metal, and to heat an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/44C22B23/00
CPCY02P10/20
Inventor 潘继红
Owner 潘继红
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