Method for producing cobalt sulfate by utilizing organic cobalt slag of zinc smelting plant

Abstract

The invention discloses a method for producing cobalt sulfate by utilizing organic cobalt slag of a zinc smelting plant, and belongs to the field of non-ferrous metal hydrometallurgy. The method comprises the following steps: firstly, washing organic cobalt slag of a zinc smelting plant with dilute acid, enabling zinc and cadmium in the organic cobalt slag to react with dilute sulfuric acid to generate zinc sulfate and cadmium sulfate, enabling the zinc sulfate and cadmium sulfate to enter a solution, performing filtering, and recycling the solution to obtain cadmium powder and zinc carbonate;carrying out low-temperature roasting on the filter residues, carrying out high-temperature roasting on organic tail gas obtained by low-temperature roasting, carrying out high-temperature decomposition on the organic tail gas, carrying out cyclic absorption tail gas treatment through alkali liquor, carrying out low-temperature roasting to obtain cobalt oxide slag, performing leaching through sulfuric acid to obtain a solution containing cobalt sulfate, carrying out P204 extraction to deeply remove impurities, completely removing the impurities, extracting cobalt by using P507 to obtain a high-purity cobalt sulfate solution, and performing evaporation, concentration and crystallization to obtain a battery-grade cobalt sulfate crystal product. The application of the method develops a new cobalt raw material source for the field of non-ferrous metal hydrometallurgy, and the method has remarkable economic value and social value.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, in particular to a method for producing cobalt sulfate by using organic cobalt slag in a zinc smelter. Background technique [0002] my country's cobalt resources are relatively scarce, and most of them rely on imports, including cobalt ore, cobalt slag and various cobalt-containing wastes. With the rapid promotion of the application of ternary lithium batteries in the new energy electric vehicle industry, my country has become the country with the fastest growth in cobalt consumption in recent years. At the same time, major cobalt ore producing countries have recently tightened export restrictions on high-grade cobalt ore. Therefore, to solve the shortage of cobalt resources in my country, on the one hand, we must actively participate in the development and utilization of cobalt resources at home and abroad, and on the other hand, we must strengthen the recycling of cobalt re...

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Problems solved by technology

[0006] Aiming at the problems that the organic cobalt slag produced in the existing zinc hydrometallurgy production process is difficult to handle and the valuable metals cannot be fully utilized, the present invention provides a method for producing cobalt sulfate by utilizing the organic cobalt slag of a zinc smelter. Including: first, wash the organic cobalt slag of zinc smelting with dilute sulfuric acid, and press filter to obtain zinc sulfate, cadmium sulfate filtrate and washing residue, replace zinc sulfate and cadmium sulfate filtrate with zinc powder to obtain cadmium powder as a by-product, and press filter to get the by-product cadmium powder. The zinc solution can use sodium carbonate to prepare the by-product zinc carbonate; after washing, the cobalt slag is roasted at low temperature to separate cobalt from organic matter, and the organic matter is roasted at low temperature to become organic gas. Treat the tail gas, leaching the cobalt oxide slag with sulfuric acid and reducing agent after low-temperature roasting can obtain a solution containing cobalt sulfate, and remove impurities through P204 extraction depth to remove impurities, and extract cobalt with P507 to obtain a high-purity cobalt sulfate solution. The product of battery-grade cobalt sulfate crystals can be obtained by concentrated crystallization

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