A method for treating arsenic in non-ferrous smelting waste acid with limonite as solid iron source

A technology for limonite and limonite slag, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of toxic elements polluting the environment, expensive treatment costs, difficult to handle, etc., achieving broad market prospects, reducing The effect of stockpiling and low production cost

Active Publication Date: 2021-11-05
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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  • A method for treating arsenic in non-ferrous smelting waste acid with limonite as solid iron source
  • A method for treating arsenic in non-ferrous smelting waste acid with limonite as solid iron source
  • A method for treating arsenic in non-ferrous smelting waste acid with limonite as solid iron source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The composition of the limonite in this example is shown in Table 1. 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 2 shown;

[0021] Table 1 limonite composition

[0022]

[0023] A method for treating arsenic in nonferrous smelting sewage acid with limonite as a solid iron source, the specific steps are as follows:

[0024] (1) Limonite slag powder is obtained by ball milling the limonite for 11 minutes until the particle size is not greater than 38 μm; wherein the ball milling speed is 760 r / min;

[0025] (2) put H 2 o 2 Add it into the dirty acid and mix evenly, then add the limonite slag powder in step (1) mix evenly and stir at room temperature for pre-dissolution treatment for 6 hours to obtain a solid-liquid mixture; where H 2 o 2 The molar rat...

Embodiment 2

[0032] Example 2: The composition of limonite in this example is shown in Table 5. 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 6;

[0033] Table 5 limonite composition

[0034]

[0035] A method for treating arsenic in nonferrous smelting sewage acid with limonite as a solid iron source, the specific steps are as follows:

[0036] (1) Limonite slag powder is obtained by ball milling the limonite for 8 minutes until the particle size is not greater than 38 μm; wherein the ball milling speed is 910 r / min;

[0037] (2) put H 2 o 2 Add it into the dirty acid and mix evenly, then add the limonite slag powder in step (1) mix evenly and stir at room temperature for pre-dissolution treatment for 2 hours to obtain a solid-liquid mixture; where H 2 o 2 The molar ra...

Embodiment 3

[0044] Example 3: The composition of limonite 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;

[0045] Table 9 limonite composition

[0046]

[0047] A method for treating arsenic in nonferrous smelting sewage acid with limonite as a solid iron source, the specific steps are as follows:

[0048] (1) Limonite slag powder is obtained by ball milling the limonite for 9 minutes until the particle size is not greater than 38 μm; wherein the ball milling speed is 850 r / min;

[0049] (2) put H 2 o 2 Add it into the dirty acid and mix evenly, then add the limonite slag powder in step (1) mix evenly and stir at room temperature for pre-dissolution treatment for 2 hours to obtain a solid-liquid mixture; where H 2 o 2The molar ra...

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Abstract

The invention relates to a method for treating arsenic in non-ferrous smelting sewage acid by using limonite as a solid iron source, and belongs to the technical field of heavy metal pollution control. In the present invention, the limonite slag powder is obtained by ball milling the limonite until the particle size is not greater than 38 μm; the H 2 o 2 Add to the dirty acid and mix evenly, then add limonite slag powder and mix evenly, and stir at room temperature for pre-dissolution treatment for 2~6h to obtain a solid-liquid mixture; adjust the pH value of the solid-liquid mixture to 1.5~4.0, and place it under normal pressure 1. Arsenic removal reaction at a temperature of 85-95°C for 12-24 hours, solid-liquid separation to obtain arsenic-containing solids and filtrates, arsenic-containing solids for stockpiling, and filtrate for deep arsenic removal treatment. The invention utilizes the natural ore limonite to remove arsenic, which not only reduces the amount of sludge stockpiles in the process of sewage acid treatment, but also achieves the purpose of fully utilizing natural resources.

Description

technical field [0001] The invention relates to a method for treating arsenic in non-ferrous smelting sewage acid by using limonite as a solid iron source, and belongs to the technical field of heavy metal pollution control. Background technique [0002] As a natural ore, limonite exists widely in nature. It is mainly composed of goethite and other iron hydroxides, including a mixture of hydrous silica and mud, and its composition varies greatly, often in the form of lumps. Shaped, earthy or grape-shaped, yellowish brown or dark brown. And the structure is loose and easy to smelt. The main elements of limonite are Fe, Al, Si, and it also contains As, S, Zn, Ti, K and other elements, and the iron content is generally about 40~60%. The main phase of limonite is Fe 2 o 3 and FeO(OH) nH 2 O. As a natural iron ore widely existing in my country, limonite has low cost but low utilization rate. [0003] As for the treatment method of polluted acid, the sulfidation precipitati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
CPCC01G49/00
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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