Method for treating arsenic in nonferrous smelting waste acid by jarosite slag collaborated by carbide slag

A technology of jarosite slag and carbide slag, which is applied in the fields of filtration treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of toxic elements polluting the environment, large amount of secondary hazardous waste slag, and high water hardness , to achieve the effect of broad market prospect, simple process operation and low production cost

Active Publication Date: 2019-09-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the treatment method of polluted acid, the vulcanization method-lime iron salt method is widely used at present. Although this method has simple process and low disposal cost, its harmless disposal is not complete in practical application, and the amount of secondary hazardous waste residue Big
A large amount of difficult-to-handle and difficult-to-storage waste residues are stored in the environment, which not only easily releases toxic elements to pollute the environment, but also causes high hardness of the treated water, making it difficult to recycle, and the disposal cost of waste residues is expensive

Method used

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  • Method for treating arsenic in nonferrous smelting waste acid by jarosite slag collaborated by carbide slag
  • Method for treating arsenic in nonferrous smelting waste acid by jarosite slag collaborated by carbide slag
  • Method for treating arsenic in nonferrous smelting waste acid by jarosite slag collaborated by carbide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The components of jarosite slag in this example are shown in Table 1, and the components of carbide slag are shown in Table 2. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of The dirty acid with impurities such as arsenic, the main components are shown in Table 3;

[0020] Table 1 Jarosite slag components

[0021]

[0022] Table 2 Composition of carbide slag

[0023]

[0024] Table 3 Sewage Acid Components

[0025]

[0026] A method for treating arsenic in non-ferrous smelting sewage acid with jarosite slag and calcium carbide slag, the specific steps are as follows:

[0027] (1) Mix jarosite slag and calcium carbide slag evenly, and ball mill after drying until the particle size of the mixture is not higher than 0.56 μm to obtain mixed slag powder; the mass ratio of jarosite slag to calcium carbide slag is 10:1, and the ball mill The rotating speed is 760r / min, and the gr...

Embodiment 2

[0037] Example 2: The components of jarosite slag in this example are shown in Table 6, and the components of carbide slag are shown in Table 7. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of Sewage acid with impurities such as arsenic, the main components are shown in Table 8;

[0038] Table 6 jarosite slag components

[0039]

[0040] Table 7 Composition of carbide slag

[0041]

[0042] Table 8 Sewage Acid Components

[0043]

[0044] A method for treating arsenic in non-ferrous smelting sewage acid with jarosite slag and calcium carbide slag, the specific steps are as follows:

[0045] (1) Mix jarosite slag and carbide slag evenly, and ball mill after drying until the particle size of the mixture is not higher than 0.47 μm to obtain mixed slag powder; the mass ratio of jarosite slag to carbide slag is 13:4, and the ball mill The rotating speed is 910r / min, and the grinding time is 11mi...

Embodiment 3

[0055] Example 3: The components of jarosite slag in this example are shown in Table 11, and the components of carbide slag are shown in Table 12. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of Sewage acid with impurities such as arsenic, the main components are shown in Table 13;

[0056] Table 11 Jarosite slag components

[0057]

[0058] Table 12 Composition of carbide slag

[0059]

[0060] Table 13 Sewage Acid Components

[0061]

[0062] A method for treating arsenic in non-ferrous smelting sewage acid with jarosite slag and calcium carbide slag, the specific steps are as follows:

[0063] (1) Mix jarosite slag and carbide slag evenly, and ball mill after drying until the particle size of the mixture is not higher than 0.42 μm to obtain mixed slag powder; the mass ratio of jarosite slag to calcium carbide slag is 11:2, and the ball mill The rotating speed is 835r / min, and the grinding ...

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Abstract

The invention relates to a method for treating arsenic in nonferrous smelting waste acid by jarosite slag collaborated by carbide slag, belonging to the technical field of heavy metal pollution control. In the invention, the jarosite slag and the carbide slag are uniformly mixed, and ball milling is carried out until the particle size of the mixture is not more than 0.56 mu m to obtain mixed slag powder; the mixed slag powder and potassium permanganate are added into the nonferrous smelting waste acid to mix evenly, air is continuously introduced under the stirring condition, and oxidation dearsenization reaction is performed for 24 to 36 hours to obtain a solid-liquid mixture; the solid-liquid mixture is subjected to solid-liquid separation to obtain an arsenic-containing solid matter and filtrate, the arsenic-containing solid matter is stacked and treated, and the filtrate enters the next step of deep arsenic removal treatment. In the invention, the jarosite slag and the carbide slag are adopted to remove arsenic in the nonferrous smelting waste acid, so that the arsenic removal effect is excellent, the process operation is simple, the production cost is low, the amount of sludge generated after arsenic removal is small, and the problem of large sludge stockpiling is relieved.

Description

technical field [0001] The invention relates to a method for treating arsenic in non-ferrous smelting sewage acid with jarosite slag and calcium carbide slag, and belongs to the technical field of heavy metal pollution control. Background technique [0002] The jarosite method was developed in the 1960s after years of experimental research at the Reston Electric Zinc Plant of the Australian Electric Zinc Company, and is widely used in zinc smelting. my country is a big country of zinc production and consumption. More than 50% of the zinc smelters use the jarosite method to remove iron. This method will produce a large amount of jarosite slag in the process of smelting zinc. The annual slag production is about the zinc output half of. These waste residues are generally stored directly without proper treatment, causing great harm to the surrounding environment. The main elements of jarosite slag are Fe, S, and Zn, and it also contains As, Cd, Ga, In, and other elements, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/72C02F1/001C02F2101/103
Inventor 祁先进李雪竹祝星李永奎郝峰焱王华李孔斋
Owner KUNMING UNIV OF SCI & TECH
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