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Method for precipitating nickel with mixed alkali

A technology of mixed alkali and nickel precipitation, applied in the field of metallurgy, can solve the problems of high moisture content of filter cake, small sediment particle size, and increased transportation costs

Active Publication Date: 2016-06-29
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its strong alkalinity, it is easy to form local over-alkali when adding materials in the actual industrial operation process, resulting in small sediment particle size, poor sedimentation and filtration performance, and high moisture content of the filter cake. After filtering through a 1.6MPa vertical filter press, The moisture content is still high above 68%, which increases the subsequent transportation cost

Method used

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  • Method for precipitating nickel with mixed alkali
  • Method for precipitating nickel with mixed alkali

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Mix 0.05L of 10wt% mixed lye (the molar ratio of sodium hydroxide to sodium carbonate is 1:1) and 1L of nickel-containing solution with a nickel ion concentration of 3.0g / L, and heat it at a temperature of 65 degrees Celsius The nickel-precipitation treatment was carried out for 4 hours; the obtained nickel-precipitated ore slurry was thickened to obtain the underflow slurry and the supernatant respectively; then the obtained underflow slurry was subjected to vacuum filtration or vacuum pressure filtration Filtration treatment, while using distilled water to wash the obtained nickel-containing filter cake, so as to obtain a nickel-containing filter cake with a water content of 62 wt%.

Embodiment 2

[0048] Mix 0.1L of mixed lye with a concentration of 5wt% (the molar ratio of sodium hydroxide and sodium carbonate is 1:2) and 1L of nickel-containing solution with a nickel ion concentration of 3.0g / L, and heat it at a temperature of 65 degrees Celsius The nickel-precipitation treatment was carried out for 4 hours; the obtained nickel-precipitated ore slurry was thickened to obtain the underflow slurry and the supernatant respectively; then the obtained underflow slurry was subjected to vacuum filtration or vacuum pressure filtration Filtration treatment, while using distilled water to wash the obtained nickel-containing filter cake, so as to obtain a nickel-containing filter cake with a water content of 58 wt%.

Embodiment 3

[0050] Mix 0.034L of 15wt% mixed lye (the molar ratio of sodium hydroxide to sodium carbonate is 1:2) and 1L of nickel-containing solution with a nickel ion concentration of 3.0g / L, and heat it at a temperature of 65 degrees Celsius The nickel-precipitation treatment was carried out for 4 hours; the obtained nickel-precipitated ore slurry was thickened to obtain the underflow slurry and the supernatant respectively; then the obtained underflow slurry was subjected to vacuum filtration or vacuum pressure filtration Filtration treatment, while using distilled water to wash the obtained nickel-containing filter cake, so as to obtain a nickel-containing filter cake with a water content of 61 wt%.

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Abstract

The invention discloses a method of precipitating nickel by using a mixed base. The method comprises the following steps: carrying out nickel participation treatment on mixed alkali liquor and a nickel-containing liquid, so as to obtain ore pulp after nickel participation; carrying out dense treatment on the ore pulp after nickel participation, so as to respectively obtain bottom flow slurry and supernate; and filtering the bottom flow slurry, so as to respectively obtain a nickel-containing filter cake and filtrate, wherein the mixed alkali liquor comprises sodium hydroxide and sodium carbonate. The nickel sediment with low moisture content can be prepared by adopting the method for precipitating the nickel by using the mixed base disclosed by the embodiment of the invention.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method for mixing alkali to precipitate nickel. Background technique [0002] At present, the precipitants commonly used in the nickel precipitation process in the wet laterite smelting process of metal nickel include sodium hydroxide, magnesium oxide, calcium oxide, sulfide, sodium carbonate, etc. Among them, sodium hydroxide nickel precipitation has a simple principle and is easy to operate. The raw materials are easy to purchase, and are commonly used in the nickel deposition process in the industry. However, due to its strong alkalinity, it is easy to form local over-alkali when adding materials in the actual industrial operation process, resulting in small sediment particle size, poor sedimentation and filtration performance, and high moisture content of the filter cake. After filtering through a 1.6MPa vertical filter press, The moisture content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/46C22B23/00
CPCY02P10/20
Inventor 孙宁磊张杰磊傅建国戴江洪李少龙陈兴张阳王魁珽
Owner CHINA ENFI ENGINEERING CORPORATION