Fast leaching method for copper-cobalt alloy

Abstract

The invention discloses a fast leaching method for a copper-cobalt alloy. The fast leaching method for the copper-cobalt alloy comprises the following steps of (1) preparing a sulfuric acid solution with the concentration being 1 to 6mol / L, and adding ferric sulfate into the sulfuric acid solution until the ferric ion concentration reaches to 25 to 40g / L; (2) adding copper-cobalt alloy powder withthe diameter being 50 to 200mum into a mixed solution in the step (1) according to the liquid-solid ratio being 10 to 15:1, stirring and reacting; (3) when the concentration of Fe3+ in a solution tobe reacted is lower than 8g / L, stopping stirring, standing, guiding the solution separated after standing out into the other container, feeding oxygen into the guided-out solution until the concentration of Fe3+ in the solution reaches to 20 to 25g / l, re-pouring, and then continuously stirring; and (4) repeating the step (3) until the alloy is completely leached. Compared with a traditional technology, the fast leaching method for the copper-cobalt alloy provided by the invention is simple in process, fast in leaching speed, low in cost and free of pollution.

Description

technical field [0001] The invention relates to an alloy processing method, in particular to a rapid leaching method for copper-cobalt alloys. Background technique [0002] Cobalt is an important strategic non-ferrous metal, which is widely used in lithium-ion battery cathode materials and other fields. my country's cobalt resources are very scarce, and it has long been imported from countries such as Congo (Kinshasa) and Zambia, which are rich in cobalt resources. Copper-cobalt ore has been transformed into copper-cobalt alloy for export by smelting in an electric furnace, so copper-cobalt alloy has replaced cobalt ore and become an important cobalt raw material in the Chinese market. The main components of copper-cobalt alloys are cobalt, copper and iron, which mainly exist in the form of simple substances. The main technical difficulty in hydrometallurgy of copper-cobalt alloys lies in dissolution and leaching. The copper-cobalt alloy dissolution and leaching methods re...

AI Technical Summary

Problems solved by technology

The electrochemical dissolution method is to cast a copper-cobalt alloy into an anode plate and then pass direct current into the sulfuric acid system for electrochemical dissolution. Although the treatment cost is low, this method has the disadvantages of long dissolution time and low direct metal recovery rate, and is not conducive to continuous Chemical production

The oxidative acid dissolution method is to oxidize and dissolve the finely ground copper-cobalt alloy in a sulfuric acid system with an oxidant (chlorine gas, sodium hypochlorite, sodium chlorate, hydrogen peroxide, etc.). Although the dissolution effect is good, there are disadvantages such as large consumption of oxidant and high cost.

The micro-bubble acid dissolution method is to inject a large amount of oxygen into the copper-cobalt alloy dissolution system, and the air is dissolved in water in the form of micro-bubbles. Although the cost of this method is low, it has the disadvantages of slow dissolution rate and easy agglomeration of the alloy.

Mixed acid system dissolution is to dissolve copper-cobalt alloy in a mixed system of sulfuric acid and nitric acid containing catalysts. Although the leaching rate of cobalt and copper is high, there are low metal direct recovery, poor operating environment, high cost and difficult treatment of nitrogen-containing wastewater. and other shortcomings

The fluoride addition method is to add fluoride such as hydrogen fluoride and sodium fluoride to the dissolution system. Although it has the advantages of fast dissolution speed, it brings great difficulty to wastewater treatment due to the introduction of fluoride ions into the system.