Method for treating high-arsenic polluted acid by utilizing zinc slag

A technology of high-arsenic polluted acid and arsenic polluted acid, which is applied in the fields of filtration treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of cumbersome operation steps, low energy consumption and low pollution of wet treatment, and achieve technological The effect of simple operation, reduced stockpiling, and high arsenic removal rate

Pending Publication Date: 2020-11-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the wet treatment of arsenic-containing sludge has low energy consumption, low pollution and high efficiency, but the operation steps are cumbersome; the fire treatment process is simple, the production is stable and the efficiency is high, but it will cause secondary pollution, and silicate is often used in the solidification method Cement method, but the cost of this method is relatively high, which is not conducive to large-scale use by enterprises

Method used

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  • Method for treating high-arsenic polluted acid by utilizing zinc slag
  • Method for treating high-arsenic polluted acid by utilizing zinc slag
  • Method for treating high-arsenic polluted acid by utilizing zinc slag

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: The components of the zinc slag in this example are shown in Table 1. The dirty acid comes from the dirty acid containing a large amount of impurities such as arsenic that is produced after the sulfuric acid workshop of the zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 2. Show;

[0020] Table 1 Composition of Zinc Slag

[0021]

[0022] Table 2 Sewage Acid Components

[0023]

[0024] A method for treating high-arsenic polluted acid by using zinc slag, the specific steps are as follows:

[0025] (1) Add commercially available hydrogen peroxide to high-arsenic polluted acid and mix evenly to obtain mixed solution A; wherein the volume ratio of hydrogen peroxide to high-arsenic polluted acid is 1.2:1;

[0026] (2) Add zinc slag powder to mixed solution A, and use dilute sulfuric acid to adjust the pH value of the system to 2 to obtain mixed solution B; wherein the particle size of zinc slag powder i...

Embodiment 2

[0034] Embodiment 2: The composition of zinc slag in this example is shown in Table 5. The dirty acid comes from the dirty acid containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of the zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 6. Show;

[0035] Table 5 Composition of Zinc Slag

[0036]

[0037] Table 6 Pollution Acid Components

[0038]

[0039] A method for treating high-arsenic polluted acid by using zinc slag, the specific steps are as follows:

[0040] (1) Add commercially available hydrogen peroxide to high-arsenic polluted acid and mix evenly to obtain mixed solution A; wherein the volume ratio of hydrogen peroxide to high-arsenic polluted acid is 1.3:1;

[0041] (2) Add zinc slag powder to mixed solution A, and use dilute sulfuric acid to adjust the pH value of the system to 3 to obtain mixed solution B; wherein the particle size of zinc slag powder is 200-...

Embodiment 3

[0049] Embodiment 3: The zinc slag composition of this example is as shown in Table 9. The dirty acid comes from the dirty acid containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of the zinc smelter in Southwest China washes the smelting flue gas. The main components are as shown in Table 10. Show;

[0050] Table 9 Composition of Zinc Slag

[0051]

[0052] Table 10 Sewage Acid Components

[0053]

[0054] A method for treating high-arsenic polluted acid by using zinc slag, the specific steps are as follows:

[0055](1) Add commercially available hydrogen peroxide to high-arsenic polluted acid and mix evenly to obtain mixed solution A; wherein the volume ratio of hydrogen peroxide to high-arsenic polluted acid is 1.4:1;

[0056] (2) Add zinc slag powder to mixed solution A, and use dilute sulfuric acid to adjust the pH value of the system to 4 to obtain mixed solution B; wherein the particle size of zinc slag powder is 200...

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Abstract

The invention relates to a method for treating high-arsenic polluted acid by utilizing zinc slag, and belongs to the technical field of heavy metal pollution treatment. The method comprises the following steps: adding hydrogen peroxide into high-arsenic polluted acid, uniformly mixing to obtain a mixed solution A, adding zinc slag powder into the mixed solution A, and regulating the pH value of the system to 1.5-4 to obtain a mixed solution B; introducing air into the mixed solution B under the stirring condition at the temperature of 90-95 DEG C, reacting for 12-24 hours, carrying out solid-liquid separation to obtain an arsenic-containing solid substance and filtrate, drying the arsenic-containing solid substance, stacking, and carrying out deep arsenic removal treatment on the filtrate.According to the method, the zinc slag is used for removing arsenic in the acid and generating a stable arsenic-containing compound, diffusion and harm of arsenic in the environment are reduced, andsecondary pollution is avoided.

Description

technical field [0001] The invention relates to a method for treating high-arsenic polluted acid by using zinc slag, and belongs to the technical field of heavy metal pollution control. Background technique [0002] Sewage acid is in the acid production process of non-ferrous metal smelting. The flue gas of the furnace and converter after electric dust collection is washed to produce acid waste water. Sewage acid contains high concentration of arsenic and other heavy metal ions, which is a hazardous waste. It can only be discharged or stored after being treated and meeting the requirements. [0003] Zinc slag is the slag produced in the process of zinc hydrometallurgy. No matter what kind of hydrometallurgy process is adopted, the output of smelting slag is 1.0 to 1.2 times that of zinc. Zinc slag is a hazardous waste. Hazardous treatment and comprehensive utilization have become inevitable. [0004] At present, the wet treatment of arsenic-containing sludge has low energy...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/20
CPCC02F9/00C02F1/722C02F1/66C02F1/001C02F2101/103C02F2101/20Y02P10/20
Inventor 祁先进段孝旭王华李雪竹卢治旭
Owner KUNMING UNIV OF SCI & TECH
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