Extraction process for preparing electronic-grade cobalt sulfate from cobalt-containing waste material

Abstract

The invention discloses an extraction process for preparing electronic-grade cobalt sulfate from a cobalt-containing waste material, and relates to an extraction method for cobalt salt. The process comprises the following steps of: performing acidolysis; filtering and separating; removing iron and copper; preparing rough Co material liquid; removing impurities by P204 extraction; and separating Co and Ni by P507 extraction; and the process is characterized in that an N235 extracting agent is prepared from 8 to 12 volume percent of N235, 8 to 12 volume percent of 2-octanol and 76 to 84 volume percent of 206 solution oil; and the prepared N235 extracting agent is added into raffinate of the P204 extraction and is subjected to six stages of extraction, two stages of hydrochloric acid washing, six stages of washing, three stages of ammonia water washing and one stage of sulfuric acid washing. The process has good impurity removal effect; compared with the prior art, the process has the advantages that: one order of magnitude is reduced, particularly, impurities such as cadmium, lead and the like which are difficult to remove are removed by P204 extraction and the P507 extraction, and the impurities reach an extremely low degree. The process has short flow, the comprehensive recovery rate of cobalt is high and the production cost is lower than the average cost of the same domestic industry.

Description

technical field [0001] The invention relates to an extraction process for producing electronic-grade cobalt sulfate from waste materials containing cobalt. [0002] Background technique [0003] At present, there are two types of cobalt sulfate production technologies at home and abroad: electrolysis method and chemical reaction method. The preparation of cobalt sulfate by chemical reaction method varies according to different raw materials: such as the Chinese invention patent with the patent number ZL96105194.9 (hereinafter referred to as the existing Technology 1) The process adopted is: metal cobalt is prepared with hydrochloric acid to produce metal cobalt solution—adding sulfuric acid to heat up to produce cobalt sulfate solution—drying cobalt sulfate solution to produce cobalt sulfate crystals; another example is "Research and Production Practice of New Technology for Cobalt Slag Treatment" Guan Yajun World Nonferrous Metals 2006 No. 4 (hereinafter referred to as pri...

AI Technical Summary

Problems solved by technology

However, there are some problems in these existing methods: one is that it is difficult to produce high-purity cobalt sulfate, and its impurity content is high, which cannot meet the high requirements of users for electronic-grade products; Low metal cobalt, cobalt alloy waste, cobalt compound waste, and cobalt-containing slag with high impurity content, especially arsenic (As), cadmium (Cd) and other impurities, cannot be used at all

Third, the total recovery rate of cobalt is low

The total recovery rate of prior art 2 is only 93.50%, and the total recovery rate of prior art 3 is only 97%