Method for extracting valuable metal from cobalt metallurgical waste

Abstract

The invention provides a method for extracting valuable metal from cobalt metallurgical waste. The method comprises the following steps of S1, calcium removal, S2, copper separation, S3, calcium and magnesium removal, and S4 zinc separation. The method has the beneficial effects that 1, impurity removal liquid generated by the impurity removal procedure of cobalt wet metallurgy P204 or the valuable metal in manganese-rich slag after the impurity removal liquid is precipitated can be sufficiently utilized; 2, the metal recovery rate of the method is high, the recovery rate of calcium can reach 85% or over, and the recovery rates of copper, cobalt, manganese and zinc can reach 90% or over; 3, the technological process of the method is short and only has four steps, and applied raw and auxiliary materials are easy to obtain and low in cost; and 4, the technological process does not involve high temperature or high pressure, reaction conditions are mild, and the number of potential safety hazards is small. Calcium sulfate generated through the method can serve as a raw material for production of cement, a small amount of generated calcium fluoride slag and a small amount of generated magnesium fluoride slag can be sent to a fluorination plant to serve as raw materials, and environmental friendliness is achieved.

Description

technical field [0001] The invention relates to the technical field of extracting valuable metals, in particular to a method for extracting valuable metals from cobalt metallurgical waste. Background technique [0002] The commonly used cathode materials for lithium-ion batteries include lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganate ternary materials. Nickel-cobalt lithium manganate ternary cathode material has the characteristics of moderate price, large capacity, long cycle life, good safety, and excellent comprehensive performance. It is one of the main directions for the development of lithium-ion battery cathode materials in the future. The preparation method of nickel-cobalt-lithium-manganese oxide ternary oxide is as follows: nickel salt, cobalt salt and manganese salt are formulated into a solution in a specific proportion, and then nickel-cobalt-manganese ions are co-precipitated into nickel-cobalt-manganese hydroxide with sodium ...

AI Technical Summary

Problems solved by technology

The recovery rate of pyroprocessing is low, and the recovery rate of cobalt is less than 50%.

The N235 extraction method can separate manganese in the chloride system from metals such as zinc, cobalt and copper, but the phase separation speed is slow, the process is long, and N235 has a strong volatile odor, which is not economical.

The disadvantage of the pressurized crystallization method is that it requires high equipment and a long process.

The cost of sulfide removal process is high, only manganese can be extracted, and the sulfide formed by copper, zinc and cobalt is more difficult to handle

The electrolysis method requires large investment, low electric efficiency, and incomplete separation of various substances