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Method for comprehensive utilization of wet zinc smelting kiln residues and contaminated acid

A technology for hydrometallurgical zinc smelting and kiln slag, which is applied in the field of comprehensive utilization of resources, can solve the problems of large volume of hazardous waste slag, difficulty in meeting environmental protection requirements, and high treatment costs, and achieves the effects of clean treatment, resource saving and environmental friendliness.

Active Publication Date: 2018-07-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime neutralization method, chemical precipitation method and other treatment methods commonly used at present have the disadvantages of high treatment cost and large volume of hazardous waste residue, which are difficult to meet the increasingly stringent environmental protection requirements

Method used

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  • Method for comprehensive utilization of wet zinc smelting kiln residues and contaminated acid
  • Method for comprehensive utilization of wet zinc smelting kiln residues and contaminated acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: In terms of mass percentage, the main components of the zinc hydrometallurgy kiln slag in this example are: Fe 39.54%, Cu1.16%, Zn 2.28%, As 0.65%, S 4.95%, Ag 214.3g / t; The main components of dirty acid are: H 2 SO 4 43.23g / L, F0.69g / L, Cl1.25g / L, Cu0.10g / L, As1.22g / L;

[0024] A method for comprehensive utilization of zinc hydrometallurgy kiln slag and dirty acid, the specific steps are as follows:

[0025] (1) At room temperature, add 150g of zinc hydrolysis kiln slag into 3.0L of dilute sulfuric acid solution A for hydrolysis treatment until the pH of the solution is 4.0 to obtain hydrolyzed slag and hydrolyzed liquid; among them, dilute sulfuric acid solution A The pH value is 1, and the liquid-solid ratio mL:g of the dilute sulfuric acid solution A to the zinc hydrometallurgy kiln slag is 20:1;

[0026] (2) Under the conditions of a temperature of 60°C and an oxygen partial pressure of 0.3Mpa, place the hydrolyzed slag obtained in step (1) in dilute ...

Embodiment 2

[0030] Example 2: In terms of mass percentage, the main components of the zinc hydrometallurgy kiln slag in this example are: Fe33.24%, Cu1.26%, Zn2.71%, As0.79%, S4.74%, Ag205. 0g / t; the main components of dirty acid are: H 2 SO 4 43.23g / L, F0.69g / L, Cl1.25g / L, Cu0.10g / L, As1.22g / L;

[0031] A method for comprehensive utilization of zinc hydrometallurgy kiln slag and dirty acid, the specific steps are as follows:

[0032] (1) At a temperature of 75°C, add 200g of zinc hydrolysis kiln slag into 1.3L of dilute sulfuric acid solution A for hydrolysis treatment until the pH of the solution is 5.1 to obtain hydrolyzed slag and hydrolyzed liquid; among them, dilute sulfuric acid solution The pH value of A is 0.5, and the liquid-solid ratio mL:g of dilute sulfuric acid solution A to zinc hydrometallurgy kiln slag is 6.5:1;

[0033] (2) Under the conditions of a temperature of 100°C and an oxygen partial pressure of 0.5Mpa, place the hydrolyzed slag obtained in step (1) in dilute ...

Embodiment 3

[0037] Example 3: In terms of mass percentage, the main components of the zinc hydrometallurgy kiln slag in this example are: Fe25.43%, Cu1.03%, Zn2.02%, As1.05%, S4.75%, Ag174. 3g / t; the main components of dirty acid are: H 2 SO 4 89.70g / L, F2.36g / L, Cl3.51g / L, Cu0.28g / L, As8.54g / L;

[0038] A method for comprehensive utilization of zinc hydrometallurgy kiln slag and dirty acid, the specific steps are as follows:

[0039] (1) At a temperature of 70°C, add 200g of zinc hydrolysis kiln slag into 1.0L of dilute sulfuric acid solution A for hydrolysis treatment until the pH of the solution is 6.0 to obtain hydrolyzed slag and hydrolyzed liquid; among them, dilute sulfuric acid solution The pH value of A is 1.5, and the liquid-solid ratio mL:g of dilute sulfuric acid solution A to zinc hydrometallurgy kiln slag is 5:1;

[0040] (2) Under the conditions of a temperature of 85°C and an oxygen partial pressure of 0.4Mpa, place the hydrolyzed slag obtained in step (1) in dilute sul...

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Abstract

The invention discloses a method for comprehensive utilization of wet zinc smelting kiln residues and contaminated acid and belongs to the technical field of comprehensive utilization of resources. The method utilizes wet zinc smelting kiln residues as raw materials and contaminated acid produced by a non-ferrous smelting enterprise as a leaching agent, and comprises orderly carrying out arsenic hydrolysis and precipitation, oxidative leaching and acid leaching so that iron, zinc, copper and arsenic in the zinc kiln residues enter the leaching solution and silver is enriched in the leaching residues, oxidizing the leaching solution into scorodite so that arsenic in the solution is separated and solidified, adding iron powder or copper powder into the solution after arsenic precipitation toobtain copper precipitates, adding zinc kiln residues into the solution after copper precipitation for arsenic hydrolysis and precipitation, conveying the treated water into a sewage treatment plantand carrying out treatment. The method can fully utilize the composition characteristics of the wet zinc smelting kiln residues and contaminated acid, realizes separation and recovery of valuable metals in the zinc kiln residues and realizes cleaning treatment on contaminated acid.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of zinc hydrometallurgy kiln slag and sewage acid, and belongs to the technical field of resource comprehensive utilization. Background technique [0002] In 2016, my country's zinc metal output reached 6.3 million tons, of which more than 50% were produced by conventional wet processes. In the conventional wet process, the Wiltz method is usually used to treat the zinc leaching slag. Under the condition of 1100~1300℃, low-boiling and volatile metals such as zinc, lead, and indium in the zinc leaching slag enter the sub-zinc oxide powder, while the high-boiling point metals in the zinc leaching slag remain in the kiln slag. With the conventional wet process, about 0.8 tons of kiln slag is produced for every ton of zinc metal produced. my country produces about 2 million tons of kiln slag every year. Although most of Cu, Ag and Fe in zinc leaching slag remain in zinc kiln slag, the conte...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B30/04C22B15/00C22B11/00C22B19/30C22B19/20
CPCC22B7/007C22B7/04C22B11/044C22B15/0091C22B19/22C22B19/30C22B30/04Y02P10/20
Inventor 魏昶邓志敢张帆樊刚李旻廷李兴彬李存兄
Owner KUNMING UNIV OF SCI & TECH
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