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Method for separating and recycling heavy metal in mercury, selenium and arsenic containing dirt acid sludge

A technology of polluted acid slag and heavy metals, applied in the direction of magnesium sulfate, selenium/tellurium, etc., can solve the problems of doubled volume, large porosity of solidified body, waste of resources, etc., achieve resource recovery, avoid gypsum hazardous waste, The effect of avoiding secondary pollution

Inactive Publication Date: 2016-03-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this process has disadvantages such as large porosity of the solidified body, doubled volume, waste of storage capacity caused by entering a safe landfill, and this method solidifies a large amount of heavy metals in the sewage acid slag, which not only causes waste of resources but also has potential secondary effects. secondary pollution problem
[0004] To sum up, none of the existing treatment technologies for sewage acid slag in the non-ferrous metal smelting industry reflects the separation and recovery methods of various heavy metals with high content, and there are some disadvantages. It is necessary to further develop green processing technology

Method used

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  • Method for separating and recycling heavy metal in mercury, selenium and arsenic containing dirt acid sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Taking the dirty acid residue produced in the actual washing section of a zinc smelter as the treatment object, after preliminary dehydration, the concentration of each main component is: water content 15%, mercury content 210mg / g, selenium content 134mg / g, arsenic ion 304mg / g. The specific processing steps are as follows:

[0031] 1. Weigh 500g of dehydrated acid residue into a beaker, add 250g of magnesium oxide powder, stir to mix it thoroughly, and then let it stand for 30 minutes;

[0032] 2. Move the mixed dirty acid slag into a quartz tube, stuff an appropriate amount of quartz wool at both ends to prevent leakage of the dirty acid slag, and then put the quartz tube into a tubular electric heating furnace for roasting. The temperature is set to 600 ℃ and the temperature is stable. When the temperature is set, start timing and pass air into the quartz tube, roast for 1 hour, the air volume is 15L / min, continue to pass in air for 2 hours, and continuously pass the hot...

Embodiment 2

[0038] Taking the sewage acid residue produced in the actual washing section of a lead smelter as the treatment object, after preliminary dehydration, the concentration of each main component is: water content 20%, mercury content 178mg / g, selenium content 114mg / g, arsenic ion 332mg / g. The specific processing steps are as follows:

[0039] 1. Weigh 300g of the dehydrated acid residue into a beaker, add 150g of magnesium oxide powder, stir to mix it thoroughly, and then let it stand for 30 minutes;

[0040] 2. Move the mixed dirty acid slag into a quartz tube, stuff an appropriate amount of quartz wool at both ends to prevent leakage of the dirty acid slag, and then put the quartz tube into a tubular electric heating furnace for roasting. The temperature is set to 600 ℃ and the temperature is stable. When the temperature is set, start timing and pass air into the quartz tube, roast for 40 minutes, the air volume is 15L / min, continue to pass in air for 90 minutes, and the hot flue ...

Embodiment 3

[0046] Taking the sewage acid residue produced in the actual washing section of a lead smelter as the treatment object, after preliminary dehydration, the concentration of each main component is: moisture content 5%, mercury content 2mg / g, selenium content 200mg / g, arsenic ion 400mg / g. The specific processing steps are as follows:

[0047] 1. Weigh 300g of dehydrated acid residue into a beaker, add 30g of magnesium oxide powder, stir to mix it thoroughly, and then let it stand for 30 minutes;

[0048] 2. Move the mixed dirty acid slag into a quartz tube, stuff an appropriate amount of quartz wool at both ends to prevent the dirty acid slag from leaking, and then put the quartz tube into a blast furnace for roasting. The temperature is set at 400℃ and the temperature is stable. When the temperature is set, start timing and pass air into the quartz tube, roast for 5 hours, the air volume is 15L / min, continue to pass air for 90 minutes, and the hot flue gas discharged from the quart...

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Abstract

The invention relates to the field of environment protection, in particular to a method for separating and recycling heavy metal in mercury, selenium and arsenic containing dirt acid sludge. The method comprises the steps that firstly waste gas generated by non-ferrous metal metallurgy is washed and settled to obtain dirt acid sludge; then magnesium oxide is added for mixing to obtain mixed sludge; the mixed sludge is sequentially subjected to roasting, acidizing, neutralizing reduction and crystallization operation; and mercury-selenium elementary substances and iron arsenic salt with high purity are sequentially separated and recycled, and meanwhile ammonium magnesium sulfate and other substances with high value can be generated. Compared with the prior art, a good treatment effect on harmful smoke generated in the non-ferrous metal metallurgy process is achieved, heavy metal and sulphur elements in the harmful smoke can be recycled, and resource cyclic reutilization is achieved well; and meanwhile by-products with high value can be generated, and the method can be widely applied to treatment and resource recycling of mercury, selenium and arsenic containing dirt acid sludge in the industry of non-ferrous metal metallurgy.

Description

Technical field [0001] The invention relates to the field of environmental protection, and in particular to a method for separating and recovering heavy metals from dirty acid residues containing mercury, selenium, and arsenic with less secondary pollution and high resource recycling rate. Background technique [0002] At present, most non-ferrous metal smelting processes in my country are mainly based on pyrometallurgical processes. Non-ferrous metal ores mostly exist in the form of sulfides. During the smelting process, a large amount of sulfur oxides (including sulfur dioxide and sulfur trioxide), heavy metals and Smelting smoke of dust. Since wet scrubbing is an important part of the non-ferrous metal smelting flue gas purification process, it will inevitably produce a large amount of washing wastewater and waste residues containing sulfuric acid and heavy metals. Such wastewater and waste residues are often referred to as "soil acid" in the non-ferrous smelting industry. And...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B7/02C22B1/02C22B43/00C22B30/04C01B19/02C01F5/40
CPCC22B7/007C01B19/02C01F5/40C22B1/02C22B7/02C22B43/00
Inventor 晏乃强瞿赞马永鹏祝政轩宗晨曦
Owner SHANGHAI JIAO TONG UNIV
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