SU1759929A1 - Method of processing spent copper electrolyte containing nickel - Google Patents

Abstract

Usage: non-ferrous metallurgy, in particular when processing the spent electrolyte after electrolysis of copper. Essence: the method includes the purification of the electrolyte from impurities, the concentration of Nickel and the selection of the resulting sulfate solution of a Nickel product. The purified sulphite solution is divided into two streams, one of which is directed to the preparation of electrolyte and electrolysis, and the other stream is treated with sodium carbonate, after which the formed nickel carbonate is separated, which is used to maintain a constant nickel sulfate electrolyte concentration.

Description

This invention relates to a hydrometal; Lurgia heavy non-ferrous metals, namely, the processing of spent copper electrolyte after electrolysis of copper.

There is a method of processing copper electrolyte containing nickel, including the purification of the electrolyte from impurities, the concentration of nickel and the selection from the resulting sulfate solution of the nickel product in the form of nickel sulfate.

The disadvantage of this method is that at the stage of crystallization of nickel sulfate, a part remains in the mother liquor. In addition, the use of the method is limited by the need for nickel sulfate.

The aim of the invention is to increase the degree of nickel extraction and to enable it to be obtained as a nickel ribbon.

For this, the purified sulphate solution is divided into two streams, one of which

the next stream is treated with sodium carbonate, after which the formed nickel carbonate is separated, which is used to maintain a constant concentration of sulphate electrolyte on nickel.

PRI me R. 20 m of copper electrolyte removed from the process of electrolysis of copper containing, g / l: N1 10; C 35; H2SO / J 180; As 6; Fe 0.2, subjected to deep cleaning and evaporation, after which the electrolyte volume decreased to 0.6 cm3 and contained NI 350 g / l; Si Zmg / l; As 0.2 mg / L; Fe 1 mg / l.

The first stream (0.1 m3) was sent to obtain a nickel electrolyte and the extraction of nickel ribbon from it by electrolysis, and the second stream was treated with sodium carbonate at a flow rate of 650 kg / m3, receiving 338 kg of nickel carbonate in the sediment. The precipitate was filtered, washed, pulp was prepared with a solid content of 200 g / l, which, through

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an intermediate tank was periodically supplied to the circulating electrolyte to maintain a nickel concentration of 350 g / l. The electrolysis was carried out in a drum-type electrolyzer with a productivity (for finished products) of 8.3 kg / h at a current density of 8000 A / m2. Received 190 kg of nickel tape.

Thus, the problem of increasing the extraction of nickel was solved by continuously maintaining its predetermined concentration in the electrolyte sulphate solution that is being processed, which ensures the production of a scarce nickel tape.

The expected annual economic effect with an increase in nickel extraction by 5% compared with the base object is 1 million rubles.

Claims (1)

Claim Method A method for treating spent copper electrolyte containing nickel, including purification from impurities, concentrating nickel, and recovering a nickel product from the resulting sulphate solution, characterized in that, in order to increase nickel extraction and ensure the possibility of obtaining it is in the form of a nickel ribbon, the purified sulphate solution is divided into two streams, one of which is directed to the isolation of the nickel product, and the other stream is treated with sodium carbonate, after which the formed nickel carbonate is separated, which is used to maintain a constant concentration of sulfate electrolyte nickel.