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Method for treating arsenic in nonferrous smelting waste acid by using magnetic Fe3O4

A dirty acid and magnetic technology, applied in the field of heavy metal arsenic pollution control, can solve the problems of inability to guarantee leaching toxicity and compliance, and achieve significant environmental and economic benefits, stable physical properties, and simple operating procedures

Inactive Publication Date: 2019-07-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common treatment methods for sewage acid are lime neutralization, iron salt arsenic precipitation, and sulfide precipitation. The amount of slag is large and the arsenic content is low, but the activity of arsenic compounds is very high, and the leaching toxicity of arsenic cannot be guaranteed to meet the standard. When stored, the acidic solution will lead to the redissolution of arsenic in calcium arsenate and iron arsenate, and oxygen and bacteria will oxidize and dissolve arsenic sulfide

Method used

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  • Method for treating arsenic in nonferrous smelting waste acid by using magnetic Fe3O4
  • Method for treating arsenic in nonferrous smelting waste acid by using magnetic Fe3O4
  • Method for treating arsenic in nonferrous smelting waste acid by using magnetic Fe3O4

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic, which is produced after the sulfuric acid workshop of a copper smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 1;

[0023] Table 1 Concentration of various components of polluted acid

[0024]

[0025] Such as figure 1 As shown, a magnetic Fe 3 o 4 The method for treating the arsenic in the waste acid of non-ferrous smelting, the specific steps are as follows:

[0026] (1) The magnetic Fe 3 o 4 Mix well with dirty acid and pretreat for 12 hours under stirring conditions to obtain solution A, then add H to solution A 2 o 2 and scorodite crystals, mix uniformly to obtain solution B; wherein the arsenic content of dirty acid is 8000mg / L, and the magnetic Fe 3 o 4 The molar ratio of the iron in the iron to the arsenic in the dirty acid is 2:1, the molar ratio of the scorodite crystals to...

Embodiment 2

[0031] Example 2: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic, which is produced after the sulfuric acid workshop of a zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 3;

[0032] Table 3 Concentration of each component of polluted acid

[0033]

[0034] Such as figure 1 As shown, a magnetic Fe 3 o 4 The method for treating the arsenic in the waste acid of non-ferrous smelting, the specific steps are as follows:

[0035] (1) The magnetic Fe 3 o 4 Mix well with dirty acid and pretreat for 18 hours under stirring conditions to obtain solution A, then add H to solution A 2 o 2 and scorodite crystals, mix evenly to obtain solution B; wherein the arsenic content of dirty acid is 10000mg / L, and the magnetic Fe 3 o 4 The molar ratio of the iron in the iron to the arsenic in the dirty acid is 2.5:1, the molar ratio of the scorodite crystals to the a...

Embodiment 3

[0040] Embodiment 3: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of a copper smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 5;

[0041] Table 5 Concentration of various components of polluted acid

[0042]

[0043] Such as figure 1 As shown, a magnetic Fe 3 o 4 The method for treating the arsenic in the waste acid of non-ferrous smelting, the specific steps are as follows:

[0044] (1) The magnetic Fe 3 o 4 Mix evenly with dirty acid and pretreat for 24 hours under stirring conditions to obtain solution A, then add H to solution A 2 o 2 and scorodite crystals, mix uniformly to obtain solution B; wherein the arsenic content of dirty acid is 13000mg / L, and the magnetic Fe 3 o 4 The molar ratio of the iron in the iron to the arsenic in the dirty acid is 3:1, the molar ratio of the scorodite crystals to the...

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Abstract

The invention relates to a method for treating arsenic in nonferrous smelting waste acid by using magnetic Fe3O4, and belongs to the technical field of heavy metal arsenic pollution treatment. The method comprises the following steps: uniformly mixing magnetic Fe3O4 and contaminated acid, conducting pre-treating for 12-24 hours under a stirring condition to obtain a solution A, adding H2O2 and a scorodite crystal into the solution A, and conducting uniform mixing to obtain a solution B; carrying out an arsenic removal reaction on the solution B for 8-12 hours at the temperature of 70-90 DEG Cunder a stirring condition, and carrying out solid-liquid separation to obtain an arsenic-containing solid substance and a filtrate C; conducting ball milling and magnetic separation on the arsenic-containing solid substance to separate out magnetic Fe3O4 and pure scorodite, returning the magnetic Fe3O4 for circulation, and safely treating the pure scorodite. The method is simple in working process and obvious in arsenic removal effect, and the generated scorodite is stable in physical property.

Description

technical field [0001] The invention relates to a magnetic Fe 3 o 4 The invention discloses a method for treating arsenic in nonferrous smelting sewage acid, belonging to the technical field of heavy metal arsenic pollution control. Background technique [0002] my country's arsenic resource reserves account for 70% of the global total, and it is also one of the countries most severely polluted by arsenic. Most arsenic compounds are toxic. Due to the lack of awareness of arsenic, it leads to abuse and flows into the environment, causing great potential danger. Therefore, the removal of arsenic has become one of the important goals of the metallurgical and chemical industry, and the dirty acid from non-ferrous smelting has become an important purpose of treatment. In the non-ferrous smelting process, when the smelting flue gas is acid leached to recover valuable metals, the acid leaching solution is mixed with the circulating cooling water in the equipment and process, the...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/10C02F101/20C02F101/22
CPCC02F9/00C02F2101/103C02F1/488C02F1/722C02F2209/06C02F1/66C02F1/001C02F2101/20C02F2101/22
Inventor 祁先进李永奎祝星王华李孔斋魏永刚胡建杭
Owner KUNMING UNIV OF SCI & TECH
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