Method for preparing ultra-pure cobalt board

Abstract

The invention provides a method for preparing ultra-pure cobalt, and relates to a method for producing a high-pure cobalt board by adopting a hydrometallurgy technology. The purity of the produced high-pure cobalt board can reach 99.9999% or above. The method for producing the high-pure cobalt board by adopting the hydrometallurgy technology is characterized in that cobalt of which the brand number is Co9998 is electrochemically dissolved to prepare cobaltous sulfate stoste, after deep purification of the cobalt solution is achieved through ion exchange, a cobalt metal in the high-pure cobaltsolution is refined by adopting an electrodeposition refining technology in an electrodeposition cell, so that the cobalt is evenly precipitated on a cathode starting sheet, and the technology processcomprises that the concentration of the cobaltous sulfate stoste is adjusted to 80-90 grams per liter, the ph value is controlled to 4.5-5, the flow velocity of the solution is controlled at 25-30 liter per hour, adsorption and decontamination are carried out on the cobaltous sulfate stoste through ion exchange resin 711 to obtain a high-pure cobaltous sulfate solution, then the purified solutionis put into the electrodeposition cell, the precipitation of the ultra-pure cobalt in the cathode is achieved through an electrodeposition refining purification technology, and the voltage of the cell is controlled to 1.1-1.3 volts. The prepared high-pure cobalt board has the advantages that the inner portion is compact, the surface is flat, the thickness is 1-2 millimeters, and the purity detected by a glow mass spectrum detector can reach 99.9999% or above.

Description

technical field [0001] The invention relates to an ultra-high-purity cobalt plate, which is a raw material required in the field of sputtering targets and high-temperature alloys, by using a hydrometallurgical process, and specifically relates to a method for preparing an ultra-high-purity cobalt plate. Background technique [0002] The research and industrialized production of high-purity cobalt were only produced by Japanese mining companies before. The patents of Beijing Pinyi Material Technology Co., Ltd. in the production of high-purity cobalt are similar to those of Suzhou Jingchun in the production of high-purity nickel, mainly using sulfuric acid system Under the low or mixed acid system, the method of combining ion exchange resin with activated carbon adsorption is used for deep impurity removal. The patent uses a resin with special adsorption effects on iron and nickel. The patent points out that it can produce 4N-6N high-purity cobalt. No specific implementation c...

AI Technical Summary

Problems solved by technology

However, there are certain technical bottlenecks. It is difficult to reduce iron, nickel, copper, and iron to less than 1ppm, making it difficult to achieve high-purity cobalt above 5N.

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