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A method of using silica gel to strengthen zinc slag to remove arsenic in polluted acid

A technology of strengthening zinc and silica gel, which is applied in the field of heavy metal pollution control, can solve the problems of not using zinc slag to remove arsenic, achieve good stability and chemical inertness, low cost, and effectively fix arsenic

Active Publication Date: 2022-03-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method of using zinc slag to remove arsenic in polluted acid

Method used

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  • A method of using silica gel to strengthen zinc slag to remove arsenic in polluted acid
  • A method of using silica gel to strengthen zinc slag to remove arsenic in polluted acid
  • A method of using silica gel to strengthen zinc slag to remove arsenic in polluted acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The composition of the zinc slag used in this example is shown in Table 1. 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 2;

[0019] Table 1 Composition of Zinc Slag

[0020] Zinc dross Fe Ca S Si Al Mg Zn mn F O Proportion(%) 30.0 14.4 2.2 3.0 2.3 1.8 1.7 1.1 0.7 Balence

[0021] Table 2 Sewage Acid Components

[0022]

[0023] The method described in this embodiment utilizes silica gel to strengthen zinc slag to remove arsenic in polluted acid, and the specific steps are as follows:

[0024] (1) Finely grind the zinc slag through a 200-mesh sieve to obtain zinc slag powder.

[0025] (2) Mixing the zinc slag powder and the silica gel solution in step (1) to obtain the arsenic removal agent; wherein the mass ratio of the zi...

Embodiment 2

[0035] The composition of the zinc slag used in this example is shown in Table 5. The dirty acid comes from the sulfuric acid workshop of the zinc smelter in Southwest China, which contains a large amount of impurities such as arsenic. The main components are shown in Table 6.

[0036] Table 5 Composition of Zinc Slag

[0037]

[0038] Table 6 Pollution Acid Components

[0039]

[0040] The method described in this embodiment utilizes silica gel to strengthen zinc slag to remove arsenic in polluted acid, and the specific steps are as follows:

[0041] (1) Finely grind the zinc slag through a 200-mesh sieve to obtain zinc slag powder.

[0042] (2) Mixing the zinc slag powder and the silica gel solution in step (1) to obtain the arsenic removal agent; wherein the mass ratio of the zinc slag powder to the silica gel solution is 5:1, and the silica gel solution is a commercially available product.

[0043] (3) Step (2) arsenic removal agent and H 2 o 2 Add it into the ar...

Embodiment 3

[0052] The composition of the zinc slag used in this example is shown in Table 9. The dirty acid comes from the sulfuric acid workshop of the zinc smelter in Southwest China, which contains a large amount of impurities such as arsenic. The main components are shown in Table 10.

[0053] Table 9 Composition of Zinc Slag

[0054] Zinc dross Fe Ca S Si Al Mg Zn mn F O Proportion(%) 34.2 16.4 2.2 3.6 4.1 1.9 1.6 2.1 0.2 Balence

[0055] Table 10 Sewage Acid Components

[0056]

[0057]

[0058] The method described in this embodiment utilizes silica gel to strengthen zinc slag to remove arsenic in polluted acid, and the specific steps are as follows:

[0059](1) Finely grind the zinc slag through a 200-mesh sieve to obtain zinc slag powder.

[0060] (2) Mixing the zinc slag powder and the silica gel solution in step (1) to obtain the arsenic removal agent; wherein the mass ratio of the zinc slag powder to the silica gel solution...

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Abstract

The invention discloses a method for using silica gel to strengthen zinc residue to remove arsenic in polluted acid, and belongs to the technical field of heavy metal pollution control. The method of the invention is that the zinc slag is finely ground and sieved to obtain the zinc slag powder, and the zinc slag powder is mixed with the silica gel solution to obtain the arsenic remover; the arsenic remover and H 2 O 2 Add it into the arsenic-containing polluted acid and mix it evenly, use sodium hydroxide solution to control the pH of the solution to be 2-4, and react at a temperature of 80-90 ° C and stirring for 4-6 hours, and separate the solid-liquid to obtain iron arsenate as the core. , arsenic-rich slag and filtrate in the core-shell structure with silica gel as the shell, and the filtrate is subjected to deep arsenic removal treatment; 2 Strengthening the removal of arsenic from zinc slag not only improves the rate of arsenic removal, but also improves the stability of arsenic-containing precipitation, which is beneficial to stockpiling.

Description

technical field [0001] The invention relates to a method for removing arsenic in polluted acid by using silica gel to strengthen 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 hydrometallurgy; zinc slag is mainly composed of O, Fe, Ca and other elements, and the main component is Fe 2 o 3 and calcium silicon oxide, accounting for 79% of the total zinc slag, also contains less than 10% MnO 2 、Al 2 o 3 , ZnO, etc. No matter what kind of hydrometallurgy process is adopted, the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33A62D101/40
CPCA62D3/33A62D2203/02A62D2101/40
Inventor 祁先进段孝旭杨妮娜史佳豪
Owner KUNMING UNIV OF SCI & TECH
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