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Comprehensive recovery method for zinc hydrometallurgy net liquid slag

A technology of hydrometallurgical zinc smelting and recovery method, applied in the field of zinc smelting, can solve the problems of high cost of cobalt removal, electrolytic sintering, poor electrolysis of zinc smelting system, etc.

Inactive Publication Date: 2019-09-03
CHIFENG ZHONGSE ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of using JS-3 type zinc liquid purifier to remove cobalt are: 1) JS-3 type zinc liquid purifier is an organic component, which needs to use activated carbon to absorb and remove organic matter. The removal of organic matter is not clean, and the purified leaching solution will still contain a small amount If the organic matter enters the zinc smelting system, it will have a negative impact on the zinc smelting system over time. If the electrolysis of the zinc smelting system is not good, it will easily cause the phenomenon of electrolytic burning and affect various production indicators. It is not easy to control control, high cost of cobalt removal
However, in the process of removing cadmium first, due to the presence of cobalt impurities, the complexity and usage of zinc powder replacement in the process of using zinc powder replacement increases, increasing the cost of cadmium removal

Method used

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  • Comprehensive recovery method for zinc hydrometallurgy net liquid slag

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Experimental program
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Embodiment 1

[0021] Embodiment 1: as figure 1 Shown, a kind of comprehensive recovery method of hydrometallurgy zinc liquid slag, it comprises the following steps successively:

[0022] S1. Low-acid leaching: add net liquid slag, sulfuric acid, and electrolytic waste liquid to the low-acid leaching tank to leaching the net liquid slag, and separate the solid and liquid to obtain copper-enriched slag and net liquid slag leaching solution. The copper-enriched slag is oxidized and Leaching and recovery of metallic copper;

[0023] S2. Iron and arsenic removal: Pour the net liquid slag leaching solution into the iron and arsenic removal neutralization tank, add sodium nitrite for neutralization reaction to remove iron and arsenic, and separate solid and liquid to obtain iron and arsenic waste slag and iron and arsenic removal leaching solution;

[0024] S3. Recovering cobalt: Pour the leaching solution for removing iron and arsenic into the cobalt recovery reaction tank, raise the temperatur...

Embodiment 2

[0026]Embodiment 2: other processing steps and process parameter are identical with embodiment 1; Difference is:

[0027] S3. Recovering cobalt: Pour the leaching solution for removing iron and arsenic into the cobalt recovery reaction tank, raise the temperature to 92°C, add sodium carbonate to adjust the pH value to 4.5, add sodium persulfate for chemical reaction, press S 2 o 3 2+ The molar mass of Fe is 2+ , Mn 2+ , and Co 2+ Sodium persulfate is added at a ratio of 4 times the sum of the moles, and the reaction time is 2 hours. The solid-liquid separation obtains the cobalt slag and the cobalt removal leaching solution; Cobalt slag washing solution, the cobalt slag washing solution returns to the low-acid leaching tank. In this embodiment, the content of cobalt in the leaching solution for removing iron and arsenic is 0.86 g / L, and the content of cobalt in the leaching solution for removing cobalt is 0.016 g / L.

[0028] Embodiment 2: other processing steps and proce...

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Abstract

The invention discloses a comprehensive recovery method for zinc hydrometallurgy net liquid slag. The method comprises the steps of low-acid leaching, neutralization and removal of iron and arsenic, recovery of cobalt and recovery of cadmium in sequence; zinc-enriched leaching liquid is returned to a zinc smelting system after removal of copper, iron, arsenic, cobalt and cadmium; the step of recovery of cobalt is to heat iron and arsenic removal leaching liquid to 90-95 DEG C; sodium carbonate is fed to adjust the pH value within 4.5-5.0; ammonium persulfate or sodium persulfate is fed for chemical reaction, and is fed according to a ratio that the molar weight of S2O32+ is 4-6 times of the molar weight sum of Fe2+, Mn2+ and Co2+; the reaction time is 1-2 hours; and cobalt slag and cobaltremoval leaching liquid are obtained through solid-liquid separation.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting, and in particular relates to a method for comprehensively recovering zinc liquid slag from hydrometallurgy. Background technique [0002] In the zinc hydrometallurgy process, the two-stage zinc powder arsenic salt purification method is generally used to clean the liquid, and the clean liquid slag contains a large amount of Zn, Cu, Cd, Co, Fe and As. The recovery of valuable metals in the net liquid slag generally adopts a comprehensive recovery process. First, a certain concentration of dilute sulfuric acid is used to leach the net liquid slag and perform solid-liquid separation. Zn, Cd, Co, Fe, and As in the net liquid slag are leached After entering the solution, the obtained solid slag is copper-enriched slag; the copper-enriched slag is oxidized and leached to recover metal copper, and the leachate containing Zn, Cd, Co, Fe, As is firstly neutralized to remove iron and arsenic to remov...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B17/00C22B23/00C22B30/04C22B19/30C22B19/20
CPCC22B7/007C22B15/0071C22B15/0086C22B15/0089C22B17/04C22B19/22C22B19/26C22B19/30C22B23/043C22B23/0453C22B23/0461C22B30/04Y02P10/20
Inventor 李龙曹猛关旭东魏景文姚凤霞朱建伟卜向东刘延昌孙磊刘晓伟李文涛张志强谷翠刚
Owner CHIFENG ZHONGSE ZINC IND CO LTD
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