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Method for treating arsenic-containing waste acid by taking fayalite as in-situ iron source

A technology of fayalite 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 toxic elements polluting the environment, expensive treatment costs, difficult treatment, etc., and achieves broad market prospects, The effect of reducing stockpile and low cost

Pending Publication Date: 2020-12-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As for the treatment method of polluted acid, the sulfidation precipitation-neutralization precipitation process is widely used at present. Although this method is simple in process and low in disposal cost, it has many shortcomings. Water treatment slag, water treatment slag is piled up in the environment, not only easy to release toxic elements to pollute the environment, but also expensive to deal with

Method used

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  • Method for treating arsenic-containing waste acid by taking fayalite as in-situ iron source
  • Method for treating arsenic-containing waste acid by taking fayalite as in-situ iron source
  • Method for treating arsenic-containing waste acid by taking fayalite as in-situ iron source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The composition of fayalite in this example is shown in Table 1. The polluted acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of impurities such as arsenic, which is produced after washing the smelting flue gas. The main components are shown in the table 2 shown;

[0018] Table 1 Composition of Fayalite

[0019]

[0020] Table 2 Sewage Acid Components

[0021]

[0022] A method for treating arsenic-containing polluted acid with fayalite as an in-situ iron source, the specific steps are as follows:

[0023] (1) Mill fayalite for 11 minutes until the particle size is not greater than 45 μm to obtain fayalite powder; the milling speed is 760r / min, and the grinding time is 11 minutes;

[0024] (2) put H 2 o 2 Add it to the dirty acid and mix it evenly, then add the fayalite powder obtained in step (1) and mix it evenly, and stir at room temperature for pre-dissolution treatment for 6 hours t...

Embodiment 2

[0034] Example 2: The composition of fayalite in this example is shown in Table 5. The polluted acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of impurities such as arsenic, which is produced after washing the smelting flue gas. The main components are shown in the table as shown in 6;

[0035] Table 5 Composition of Fayalite

[0036]

[0037] Table 6 Sewage Acid Components

[0038]

[0039] A method for treating arsenic-containing polluted acid with fayalite as an in-situ iron source, the specific steps are as follows:

[0040] (1) Mill fayalite for 8 minutes until the particle size is not greater than 45 μm to obtain fayalite powder; the milling speed is 910r / min, and the grinding time is 8 minutes;

[0041] (2) put H 2 o 2 Add it into the dirty acid and mix evenly, then add the fayalite powder obtained in step (1) and mix evenly, and stir at room temperature for pre-dissolution treatment for 2 hours t...

Embodiment 3

[0051] Example 3: The composition of fayalite in this example is shown in Table 9. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of impurities such as arsenic, which is produced after washing the smelting flue gas. The main components are shown in the table as shown in 10;

[0052] Table 9 Fayalite Composition

[0053]

[0054] Table 10 Sewage Acid Components

[0055]

[0056] A method for treating arsenic-containing polluted acid with fayalite as an in-situ iron source, the specific steps are as follows:

[0057](1) Mill fayalite for 9 minutes until the particle size is not greater than 45 μm to obtain fayalite powder; the ball milling speed is 850r / min, and the grinding time is 9.5 minutes;

[0058] (2) put H 2 o 2 Add to the dirty acid and mix evenly, then add the Tanggula powder obtained in step (1) and mix evenly, and stir at room temperature for pre-dissolution treatment for 2 hours to o...

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Abstract

The invention relates to a method for treating arsenic-containing waste acid by taking fayalite as an in-situ iron source, and belongs to the technical field of heavy metal pollution treatment. The preparation method comprises the following steps: ball-milling fayalite until the particle size is not greater than 45 microns to obtain fayalite powder; adding H2O2 into waste acid, conducting uniformmixing, then adding the fayalite powder, conducting uniform mixing, and conducting stirring and pre-dissolving treatment for 2-6 h at room temperature to obtain a solid-liquid mixture; adjusting the pH value of the solid-liquid mixture to 1.5-4.0, carrying out arsenic removal reaction for 12-24 hours under the conditions of normal pressure and 85-95 DEG C, carrying out solid-liquid separation to obtain an arsenic-containing solid substance and filtrate, carrying out stockpiling treatment on the arsenic-containing solid substance, and carrying out deep arsenic removal treatment on the filtrate.According to the method, natural fayalite is used for removing arsenic, the stockpiling amount of sludge in the waste acid treatment process can be reduced, and meanwhile natural resources can be fully utilized.

Description

technical field [0001] The invention relates to a method for treating arsenic-containing polluted acid by using fayalite as an in-situ iron source, and belongs to the technical field of heavy metal pollution control. Background technique [0002] Fayalite is a silicate mineral, one of the iron-forsterite series, with a chemical composition of 2FeO·SiO 2 . As a natural ore, fayalite widely exists in nature. It is rich in Fe and Si, and also contains compounds such as MnO and MgO. It is brown after oxidation and has a strong glass luster. It is mainly used in refractory materials. As a natural iron ore widely existing in my country, fayalite is low in cost, but its utilization rate is low. [0003] As for the treatment method of polluted acid, the sulfidation precipitation-neutralization precipitation process is widely used at present. Although this method is simple in process and low in disposal cost, it has many shortcomings. Water treatment slag, water treatment slag is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/20
CPCC02F9/00C02F1/722C02F1/001C02F1/66C02F1/5263C02F1/64C02F2101/103C02F2101/20
Inventor 祁先进李雪竹卢治旭王华
Owner KUNMING UNIV OF SCI & TECH
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