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Method for treating arsenic in non-ferrous smelting waste acid by using iron-rich copper slag

A technology of copper slag and dirty acid, which is applied in the field of heavy metal pollution control and metallurgical solid waste utilization, can solve the problems of toxic elements polluting the environment, difficult to recycle and apply, difficult to stockpile, etc., to achieve simple operation process, good arsenic removal effect, The effect of low economic cost

Inactive Publication Date: 2019-04-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are various valuable metals such as Fe, Cu and Ni in copper slag and a small amount of precious metals such as Au and Ag, among which the main minerals are iron silicate and magnetic iron oxide, and the grade of iron is generally more than 40%, much higher than 29. The average industrial grade of 1% iron ore, but the utilization rate of iron in copper slag is less than 1%
[0003] For the treatment of dirty acid, the sulfidation precipitation-neutralization precipitation process is widely used at present. This process has many shortcomings. In the process, it is not only easy to release toxic elements to pollute the environment, but also the cost of treatment is high; the hardness of the treated water is high, and it is difficult to recycle and apply

Method used

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  • Method for treating arsenic in non-ferrous smelting waste acid by using iron-rich copper slag
  • Method for treating arsenic in non-ferrous smelting waste acid by using iron-rich copper slag
  • Method for treating arsenic in non-ferrous smelting waste acid by using iron-rich copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The method for treating non-ferrous smelting sewage acid with the iron-rich copper slag is as follows:

[0023] 1. Press H 2 O 2 The molar ratio with arsenic is 1:1, and the H 2 O 2 Mixed with non-ferrous smelting acid, and oxidizing pretreatment at a temperature of 60°C for 3h; among them, the non-ferrous smelting acid is from a copper smelting plant in the southwestern region after washing the smelting flue gas and containing a large amount of arsenic and other impurities. , The main components are shown in Table 1; the copper slag is dried and ground, and the particle size is controlled below 0.070 mm (the composition of the copper slag is shown in Table 2);

[0024] Table 1

[0025] ;

[0026] Table 2

[0027]

[0028] 2. Mix the oxidized pretreated acid and iron-rich copper slag in a ratio of 5:1 liquid-solid ratio mL:g, and stir for 24h under normal pressure for arsenic removal reaction at a stirring speed of 180r / min; solid-liquid separation , Obtain arsenic-...

Embodiment 2

[0030] Example 2: The method for treating non-ferrous smelting sewage acid with the iron-rich copper slag is as follows:

[0031] 1. Press H 2 O 2 The molar ratio with arsenic is 1.2:1, and the H 2 O 2 It is mixed with non-ferrous smelting waste acid, and oxidized and pretreated at a temperature of 70°C for 2.5 hours; among them, the non-ferrous smelting waste acid is from a copper smelting plant in the southwestern region after washing the smelting flue gas with a large amount of arsenic and other impurities. Acid, the main components are shown in Table 1; the copper slag is dried and ground, and the particle size is controlled below 0.057 mm (the composition of the copper slag is shown in Table 2);

[0032] Table 1

[0033]

[0034] Table 2

[0035]

[0036] 2. Mix the dirty acid pretreated by oxidation and the iron-rich copper slag in a ratio of 6:1 liquid-solid ratio mL:g, and stir for 12h under normal pressure for arsenic removal at a stirring speed of 200r / min; solid-liquid sepa...

Embodiment 3

[0038] Example 3: The method for treating non-ferrous smelting sewage acid with the iron-rich copper slag is as follows:

[0039] 1. Press H 2 O 2 The molar ratio with arsenic is 1.1:1, the H 2 O 2 Mixed with non-ferrous smelting acid, oxidized and pretreated at a temperature of 80℃ for 2h; among them, the non-ferrous smelting acid is from a copper smelter's sulfuric acid workshop in southwestern China, which contains a large amount of arsenic and other impurities after washing the smelting flue gas. , The main components are shown in Table 1;

[0040] The copper slag is dried and ground, and the particle size is controlled below 0.045 mm (the composition of the copper slag is shown in Table 2);

[0041] Table 1

[0042]

[0043] Table 2

[0044]

[0045] 2. Mix the oxidized pretreated dirty acid and iron-rich copper slag at a liquid-solid ratio mL:g of 5.5:1, and stir for 18h under normal pressure for arsenic removal at a stirring speed of 180r / min; solid-liquid separation , Get arse...

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Abstract

The invention discloses a method for treating arsenic in non-ferrous smelting waste acid by using iron-rich copper slag, and belongs to the field of heavy metal pollution control and metallurgical solid waste utilization. The method comprises: carrying out oxidizing pretreatment on non-ferrous smelting waste acid, and carrying out drying grinding on iron-rich copper slag; adding the iron-rich copper slag to the pretreated non-ferrous smelting waste acid, carrying out an arsenic removal reaction by stirring under a normal pressure, and carrying out solid-liquid separation to obtain arsenic-containing copper slag; and carrying out ball milling magnetic separation on the arsenic-containing copper slag to separate copper slag and arsenic-rich solid waste, wherein the separated copper slag is recycled, and the arsenic-rich solid waste is subjected to safe disposal or secondary utilization. Compared with the traditional arsenic removal process, the method of the present invention can reducethe sludge storage amount during the waste acid treatment so as to treat the waste with the waste, and further has advantages of simple process operation, low production cost and broad market prospects.

Description

Technical field [0001] The invention relates to a method for treating arsenic in non-ferrous smelting sewage acid with high-speed iron copper slag, and belongs to the field of heavy metal pollution control and metallurgical solid waste utilization. technical background [0002] my country is a major copper producer in the world, with annual copper slag emissions exceeding 10 million tons. The current national stock of copper slag exceeds 120 million tons. Copper slag has become a large amount of industrial solid waste generated in the metallurgical industry. Copper slag contains many valuable metals such as Fe, Cu and Ni, and a small amount of precious metals such as Au and Ag. The main minerals are iron silicate and magnetic iron oxide. The grade of iron is generally more than 40%, much higher than 29. 1% of iron ore has an average industrial grade, but the iron utilization rate in copper slag is less than 1%. Therefore, effectively realizing the comprehensive utilization of co...

Claims

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Application Information

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IPC IPC(8): A62D3/30A62D101/43
CPCA62D3/30A62D2101/43
Inventor 祝星李永奎祁先进王华李孔斋魏永刚胡建杭郝峰焱
Owner KUNMING UNIV OF SCI & TECH
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