Method for refining nickel sulfate

Abstract

The invention discloses a method for refining nickel sulfate. The method specifically comprises the following steps: step 1, dissolving and oxidizing crude nickle sulphate; step 2, preparing a nickelsoap; step 3, extracting and removing iron; step 4, extracting and removing copper; step 5, extracting and removing zinc; step 6, removing organic impurities; and step 7, carrying out a series of steps in a post treatment process. According to the method for refining nickel sulfate, provided by the invention, a tradition method for refining nickel sulfate is changed, the labor intensity is lowered, that environment is polluted by hydrogen sulfide can be well avoided, and that part of Ni2+ is carried away due to hydroxide and sulfide precipitation produced can be prevented, and further the purification yield is increased greatly, and is increased to 95 percent from the 85 percent in the previous. Therefore, the yield of refined products meets market requirements, and the quality also meetschemical reagent grade requirements.

Description

technical field [0001] The invention relates to the technical field of nickel sulfate preparation, in particular to a method for refining nickel sulfate. Background technique [0002] Nickel sulfate has three types: anhydrous, hexahydrate and heptahydrate. Most of the commodities are hexahydrate, and there are two variants of α-type and β-type. The former is a blue tetragonal crystal, and the latter is a green monoclinic crystal. It loses six waters of crystallization when heated to 103°C. Soluble in water, slightly soluble in ethanol, methanol, its aqueous solution is acidic, slightly soluble in acid, ammonia, poisonous. Mainly used in the electroplating industry, it is the main nickel salt of electroplating nickel and chemical nickel, and is also the source of metal nickel ions. It can dissociate nickel ions and sulfate ions during the electroplating process. [0003] Crude nickel sulfate contains impurities such as iron, arsenic, antimony, copper, lead, zinc and free s...

AI Technical Summary

Problems solved by technology

This method is labor-intensive, and hydrogen sulfide pollutes the environment, and at the same time, part of the Ni will be taken away due to the precipitation of hydroxides and sulfides produced. 2+ , thereby affecting the yield of purification, which generally can only reach about 85%, the yield of refined products cannot meet the requirements required on the market, and the quality does not meet the requirements of chemical reagent grade