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Combined treatment method for heavy metal sludge and waste acid

A technology for heavy metal sludge and disposal methods, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of carcinogenicity, occupation of land resources, secondary pollution, etc. Simple operation and low cost effect

Active Publication Date: 2016-05-04
KUNMING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such a large amount of sludge is discharged into the environment without treatment, the sludge contains a large amount of arsenic ions and heavy metals, which will pollute our land and water resources. Arsenic ions entering the human body will cause poisoning and even cancer
If it is only stockpiled, it will not only cause secondary pollution, but also occupy a large amount of land resources, resulting in waste of land resources
High-arsenic heavy metal sludge not only contains arsenic and other heavy metals, but also contains a large amount of toxic substances, such as sulfur. If calcined, it will produce harmful gases and pollute our atmosphere

Method used

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  • Combined treatment method for heavy metal sludge and waste acid
  • Combined treatment method for heavy metal sludge and waste acid
  • Combined treatment method for heavy metal sludge and waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] like figure 1 As shown, the joint disposal method of heavy metal sludge and sewage acid, its specific steps are as follows:

[0021] (1) Firstly, the heavy metal sludge is naturally air-dried, and then crushed to a particle size of 1mm;

[0022] (2) Add dirty acid to the heavy metal sludge crushed in step (1) (the heavy metal sludge comes from the lime iron salt method, and its composition is shown in Table 1) according to the liquid-solid ratio of 2:1ml / g (the dirty acid comes from the colored Sulfuric acid containing a large amount of arsenic and other impurities produced by the sulfuric acid workshop of the smelter after washing the smelting flue gas, the main components are shown in Table 2), stirred at room temperature for 5 hours to make the mixture of the two milky, and after solid-liquid separation Obtain leachate and dearsenic sludge;

[0023] Table 1

[0024]

[0025] Table 2

[0026]

[0027] (3) Concentrate the leaching solution obtained in step (2...

Embodiment 2

[0031] like figure 1 As shown, the joint disposal method of heavy metal sludge and sewage acid, its specific steps are as follows:

[0032] (1) Firstly, the heavy metal sludge is naturally air-dried, and then crushed to a particle size of 10mm;

[0033] (2) Add dirty acid to the heavy metal sludge crushed in step (1) (the heavy metal sludge comes from the lime iron salt method, and its composition is shown in Table 3) according to the liquid-solid ratio of 20:1ml / g (the dirty acid comes from the colored Sulfuric acid containing a large amount of arsenic and other impurities produced by the sulfuric acid workshop of the smelter after washing the smelting flue gas, the main components are shown in Table 4), stirred at room temperature for 15 hours to make the mixture of the two milky, and after solid-liquid separation Obtain leachate and dearsenic sludge;

[0034] table 3

[0035]

[0036] Table 4

[0037]

[0038] (3) Concentrate the leachate obtained in step (2) at l...

Embodiment 3

[0042] like figure 1 As shown, the joint disposal method of heavy metal sludge and sewage acid, its specific steps are as follows:

[0043] (1) Firstly, the heavy metal sludge is naturally air-dried, and then crushed to a particle size of 8mm;

[0044] (2) Add dirty acid to the heavy metal sludge crushed in step (1) (the heavy metal sludge comes from the lime iron salt method, and the composition is shown in Table 5) according to the liquid-solid ratio of 15:1ml / g (the dirty acid comes from the colored The flue gas produced by pyrometallurgy and calcined copper sulfide ore, zinc sulfide ore, lead sulfide ore, etc. in the smelter, the main components are shown in Table 6), stirred at room temperature for 10 hours to make the mixture of the two become milky, and the solid-liquid separation Finally, leachate and arsenic-removed sludge are obtained;

[0045] table 5

[0046]

[0047] Table 6

[0048]

[0049] (3) Concentrate the leaching solution obtained in step (2) at ...

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Abstract

The invention relates to a combined treatment method for heavy metal sludge and waste acid, and belongs to the technical field of heavy metal sludge resource comprehensive utilization. The combined treatment method comprises the following steps: first, naturally drying the heavy metal sludge; then, crushing the naturally dried heavy metal sludge to the particle size of 1 to 10 mm; next, adding the crushed heavy metal sludge into the waste acid, stirring for 5 to 15 hours at normal temperature to make the mixture emulsible, and performing solid-liquid separation to obtain leaching liquid and arsenic removal sludge; later on, concentrating the leaching liquid at a low temperature, cooling and crystallizing the concentrated leaching liquid to obtain primary concentrate and crystallized coarse As2O3; finally, washing the obtained arsenic removal sludge with clean water to obtain a washing solution and washed sludge, solidifying the washed sludge by a conventional method to obtain a solidified product, washing the washing solution and the obtained primary concentrate with acidic gas, and returning the washed washing solution and the primary concentrate as the waste acid. According to the method, wastewater is not generated and secondary pollution is not caused in the treatment process; the finally obtained arsenic trioxide also has an economic value.

Description

technical field [0001] The invention relates to a combined treatment method of heavy metal sludge and sewage acid, and belongs to the technical field of comprehensive utilization of heavy metal sludge resources. Background technique [0002] With the improvement of people's life, the requirements for the environment are getting higher and higher. Most of the modern smelting techniques will produce "three wastes". If these three wastes are directly discharged into the environment without treatment, it will not only pollute our environment, but also pose a threat to human health. my country is a big country that produces and consumes copper. The annual output of blister copper in my country reaches 10 million tons, and the daily sludge production can reach 30 tons. If such a large amount of sludge is discharged into the environment without treatment, the sludge containing a large amount of arsenic ions and heavy metals will pollute our land and water resources, and arsenic io...

Claims

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Application Information

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IPC IPC(8): C02F11/00C01G28/00
CPCC01G28/001C01G28/005C02F11/00
Inventor 史谊峰王华杨春银祝星惠兴欢祁先进舒波徐媛魏永刚胡建杭
Owner KUNMING UNIV OF SCI & TECH
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