Method for producing high-purity nickel

Abstract

A method for producing high-purity nickel, which involves using a hydrochloric acid solution system to electro-deposit high-purity nickel, characterized in that, it includes the following steps sequentially: 3N-grade-grade electrolytic nickel was used as anode and the electro-deposition was carried out in a hydrochloric acid system, the solution obtained from the electro-deposition was extracted by a three-level countercurrent extraction using anion extraction solvents, and then back-extracted and degreased. After that, the solution was passed through the anion exchange resin to be further purified by ion exchange, and finally put into the electrolytic cell to deposit nickel. The amount of the solution that was put into the cell and the amount of the solution that was drawn out of the cell after the electro-deposition was the same? After the glow discharge analysis by a mass spectrography, the high-purity nickel obtained by the method according to the present invention was the 5N-grade-grade high-purity nickel. The cost was low and the contamination was prevented.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method for producing nickel. More particularly, it relates to a method for producing high purity nickel that includes employing 3N-grade electrolytic nickel to electro-deposited in hydrochloric acid solution system.BACKGROUND OF THE INVENTION[0002]Large quantities of special materials are demanded with the development of high technology. Many types of high purity metal which have been found are used for Hi-tech strategic goods. The production, application and characters of the high-purity or super high-purity metals are novel and growing in modern material science and engineering field. High-purity (purer than 5N-grade) metals are used in producing semiconductor and VLSI widely. More than 20 types of high purity metal such as Ga, In, As, Sb, Cd, Sn, Te, Bi, S, Zn, Cu, Se, P and their compounds or alloys are used to produce electronic components and PCB.[0003]Nickel is generally used in the conventional stainless steel, a...

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Benefits of technology

[0007]On a basis of the foresaid existed technological deficiencies, the object of the present invention is to provide a method for producing high purity nickel to settle effectively high concentration of acid in the electric dissolving stock solution cut down on production cost, dispel pollution, and depurate solution, and prevent the anolyte and catolyte from mixing each other.

[0017]A method according to the present invention electro-deposit employs high purity solution purified with ion exchange resin to produce high purity nickel of 5N-grade purity and determined by glow discharge mass spectrometry (GDMS) 5N-grade. In the procedure, reducing the content of acid in the solution by electrolyzing at a low current density at the end of electrolysis procedure, overcome the high concentration of acid in the electrolytic solution, removed acid by boil or neutralization, And it cut down the cost and prevent pollution. It employs high purity hydrochloric acid to saturate the purified organic phase, and then extract the high concentration of NiCl2 solution with the said organic phase to remove Co in order to purify the solution. It also employs combined anion exchange resin forming a three dimensional structure to further purify the solution. It performs the electrolysis, extraction, ion exchange and electro-deposition continuously to further purify the electrolytic solution. It employs an insoluble anode to produce high purity nickel purer than 5N-grade, so only purified high purity NiCl2 solution is in the electro-deposition cell. Compared with employing a soluble anode. it prevents the anolyte and catolyte from mixing each other, so that main impurities of the produced high purity nickel can be follows: alkali metals less than 0.1 ppm, Fe, Co, and Cr less than 1 ppm each, U and Th less than 0.1 ppb each, C less than 60 ppm, and O less than 100 ppm.

[0018]Detected impurities in the high purity nickel according to the present invention include 16 impurities as Co, Fe, Cu, Zn, As, Cd, Sn, Sb, Pb, Bi, Al, Mn, Mg, Si, P, and S. Concentration of each impurity element is less than 1 ppm and the concentration of the main element nickel is more than 99.999%. Preparation high purity NiCl2 solution is the basement of producing high purity nickel. Five impracticable elements, Fe, Co, Cu, Pb and Zn, which have been chosen from 16 impurities, are detected as the main impurities. According to the result estimates the purity of the solution. The experiment shows that choosing the typical impurities as the main objects to remove can improve the determining efficiency.

Problems solved by technology

Boiling and adding alkali to reduce the acid content are broadly applied in the current methods for producing high purity nickel, but the said methods result in a high cost and pollution, and the solution may not be completely purified.

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