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A method for selectively recovering mercury from smelting waste residue

A selective and waste residue technology, applied in the direction of improving process efficiency, can solve the problems of difficult refining, metal ions entering the solution, and complex components of crude mercury, and achieve the effects of low mercury content requirements, short process flow, and simple operation

Active Publication Date: 2019-05-21
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent ZL201510262880.4 discloses a method for recovering mercury from copper smelting lead filter cake, through five processes of batching process, preheating drying and distillation process, condensation process, crude mercury refining process and tail gas washing process to realize mercury recovery Recycling, but there are disadvantages of complex components of crude mercury and difficult refining
Chinese patent ZL201410247462.3 discloses a method for recovering mercury from mercury-containing tailings by complex leaching and enhanced decomposition. It uses a mixed solution of thiosulfate and selenosulfate to perform complex leaching on mercury-containing tailings, and then Mercury is finally converted into stable HgS and HgSe by heating and bubbling carbon dioxide gas, but there is a problem that metal ions such as lead and cadmium will also enter the solution with mercury during the leaching process.

Method used

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  • A method for selectively recovering mercury from smelting waste residue
  • A method for selectively recovering mercury from smelting waste residue
  • A method for selectively recovering mercury from smelting waste residue

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The smelting waste residue used in this example is lead smelting acid mud, after dehydration, the content of mercury is 5.24%, the content of lead is 13.42%, and the content of arsenic is 0.86%. Mix 250g of mercury-containing acid mud with 15g of sodium chloride evenly, that is, the mass fraction of sodium chloride is 6%, and put it in a tube furnace for chlorination roasting, the heating rate is 5°C / min, and the heating end temperature is 350 ℃, the holding time is 1h, and O 2 The volume fraction is 55%, and the gas flow rate is 0.02m / s. The result analysis found that the mercury content in the acid mud before and after the reaction decreased from 5.24% to 0.083%, the volatilization rate of lead was 0.87%, the volatilization rate of arsenic was 0.23%, and the volatilization efficiency of mercury reached 98.42% (such as figure 2 shown in column a).

Embodiment 2

[0033] The smelting waste residue used in this example is lead smelting acid mud, and the mercury content after dehydration is 5.24%. Mix 250g of mercury-containing acid mud with 20g of sodium chloride evenly, that is, the mass fraction of sodium chloride is 8%, and place it in a tube furnace for chlorination roasting, the heating rate is 5°C / min, and the heating end temperature is 350 ℃, the holding time is 1h, and O 2 The volume fraction is 60%, and the gas flow rate is 0.02m / s. The result analysis found that the mercury content in the acid mud before and after the reaction decreased from 5.24% to 0.059%, the volatilization efficiency of mercury reached 98.87%, the volatilization rate of lead was 1.09%, and the volatilization rate of arsenic was 0.25% (such as figure 2 shown in column b).

Embodiment 3

[0035] The smelting waste residue used in this embodiment has a mercury content of 5.24% after dehydration. Mix 250g of mercury-containing acid mud with 25g of sodium chloride evenly, that is, the mass fraction of sodium chloride is 10%, and place it in a tube furnace for chlorination roasting, the heating rate is 5°C / min, and the heating end temperature is 350 ℃, the holding time is 1.2h, and O 2 The volume fraction is 60%, and the gas flow rate is 0.02m / s. The result analysis found that the mercury content in the acid mud before and after the reaction decreased from 5.24% to 0.052%, the volatilization rate of lead was 1.57%, the volatilization rate of arsenic was 0.26%, and the volatilization efficiency of mercury reached 99.01% (such as figure 2 shown in column c).

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Abstract

Aiming at the problems that the mercury-containing waste residue produced in the smelting industry is complicated in component, difficult to recycle, high in environmental risk and the like, the invention discloses a method for selectively recycling mercury from smelting waste residue. The method has the characteristics of short technological process, simple operation, wide application range, no pollution and the like, can realize efficient and selective recycling of mercury in the complicated smelting waste residue, and is favorable for reducing the pollution of the mercury-containing waste residue to the environment. The method comprises the following specific steps: performing oxygen-enriched chloridizing roasting to convert mercury sulfide, mercury sulfate and the like which are steadyand difficult to volatilize in the mercury-containing waste residue into mercury chloride which is easy to volatilize, thereby realizing selective separation of mercury; and absorbing mercury chloride volatilized into a gas phase by using alkali liquor, and performing hydrolysis to obtain mercury oxide precipitate, thereby realizing recycling of mercury.

Description

technical field [0001] The invention relates to a method for selectively recovering mercury from smelting waste slag, which is mainly suitable for mercury-containing waste slag produced in the smelting process of heavy metals such as lead, zinc, copper and nickel. It belongs to the field of smelting solid waste treatment. Background technique [0002] Due to its long-distance migration, high toxicity, and bioaccumulation, mercury has attracted widespread attention. It is a heavy metal pollutant that is harmful to human health and the ecological environment. In 2013, 92 countries and regions, including China, signed the Minamata Convention on Mercury in the United Nations to reduce the harm of mercury, which is a milestone in global mercury pollution control. The non-ferrous metal smelting industry is one of the main sources of mercury emissions in my country, so how to effectively control mercury pollution in the non-ferrous smelting industry will become a major issue in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08C22B7/00C22B43/00
CPCC22B1/08C22B7/001C22B7/008C22B43/00Y02P10/20
Inventor 刘志楼徐志峰蔡鑫钟晓聪陈芳会
Owner JIANGXI UNIV OF SCI & TECH
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