Residue washing method in cobalt hydrometallurgy industry

Abstract

The invention discloses a residue washing method in the cobalt hydrometallurgy industry. The traditionally residue washing method is a single-groove residue washing method which has low residue washing efficiency and obvious water body expansion. The residue washing method in the cobalt hydrometallurgy industry comprises the following step: (1) pumping ore pulp into a pressure filter for solid-liquid separation so that filter liquor enters a filter liquor intermediate tank, and then pumping the filter liquor inside the filter liquor intermediate tank into a filter liquor storage tank; (2) upstream-washing filter residues with a multilevel washing device, wherein all levels of washing devices in the multilevel washing device are in parallel connected and then in series connected with the pressure filter, and all levels of washing devices sequentially work, and residue water obtained after the filter residues are washed by a next-level washing device is used as the washing water of a previous-level washing device, the last-level washing device uses fresh water to wash the filter residues; pumping residue washing water obtained by the first-level washing device into a residue washingwater intermediate tank and then pumping the residue washing water inside the residue washing water intermediate tank into a residue washing water storage tank. The invention prevents the water body expansion of a system and enhances the residue washing effect and the metal recovery rate.

Description

technical field [0001] The invention relates to a slag washing process, in particular to a slag washing method in the cobalt hydrometallurgy industry. Background technique [0002] The wet smelting of cobalt concentrate is generally leached with sulfuric acid, and the liquid-solid separation is achieved by a filter press. The solution is used as the raw material for the next process, and the slag forms a slag cake. The moisture content of the slag cake is ≥ 25%, and the cobalt content in the leaching solution is relatively high. In order to achieve a high cobalt recovery rate ≥ 95%, it is necessary to formulate strict cobalt-containing scrapping standards for the scrapping of the slag. In order to meet the waste standard of slag, it is necessary to wash out the leachate in the slag cake. [0003] The traditional slag washing method is a single-tank slag washing method, that is, after the slag is unloaded into the slag washing tank, new water is added to stir, and then filte...

AI Technical Summary

Problems solved by technology

This slag washing method needs to unload the filter press every time it is operated, add new water, stir and beat well, and then press filter. The slag washing efficiency is low, the labor is cumbersome, the intensity is high, and the influence of human factors is great.

In addition, since new water is added every time, the water body expands significantly, and cobalt precipitation is needed to solve the swelling water, which increases the cost of cobalt hydrometallurgy

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