Method for recovering mercury in nonferrous smelting solid waste

A technology of solid waste and recovery method, applied in the field of mercury resource recovery, can solve the problem of high energy consumption cost, and achieve the effects of recycling, avoiding environmental pollution, and avoiding volatilization

Inactive Publication Date: 2021-03-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned existing scheme still has the following defects or deficiencies: First, in the above-mentioned method, during the heat treatment process of solid waste, volatile elements such as arsenic and selenium will also volatilize, and combine with mercury again in the condensation process, and only obtained Mercury products contaminated by elements such as arsenic and selenium; secondly, the above method requires heat treatment at a temperature greater than 700 degrees to completely release mercury, and the cost of energy consumption is high

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  • Method for recovering mercury in nonferrous smelting solid waste
  • Method for recovering mercury in nonferrous smelting solid waste
  • Method for recovering mercury in nonferrous smelting solid waste

Examples

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Effect test

Embodiment 1

[0028] A method for recovering mercury in non-ferrous smelting solid waste, comprising the following steps:

[0029] (1) Take solid waste and calcium oxide with a mass ratio of 1:0.1 for ball milling for 2 hours. The ball-to-material ratio of the above ball milling process is 4:1, and the ball milling speed is 400r / min. The main components of the above solid waste are Mercury-containing solid waste such as fly ash and acid mud produced by non-ferrous smelting, the mercury content in this solid waste is 1%, and the content of arsenic and selenium are both 0.01%.

[0030] (2) Put the solid waste and calcium oxide after ball milling into industrial furnaces. Among them, the input amount of solid waste is 50kg / h, and the input amount of calcium oxide is 10kg / h. At an air flow rate of 20m 3 / h, under the condition that the pyrolysis treatment temperature is 500°C, the solid waste is pyrolyzed for 0.5h to obtain the pyrolysis flue gas, and the calcium oxide in the industrial furna...

Embodiment 2

[0033] A method for recovering mercury in non-ferrous smelting solid waste, comprising the following steps:

[0034] (1) Take solid waste and iron oxide with a mass ratio of 1:2 and perform ball milling treatment for 6 hours. The ball-to-material ratio of the ball milling process is 12:1, and the ball milling speed is 800r / min. The main components of the above solid waste are Mercury-containing solid wastes such as fly ash and acid sludge produced by non-ferrous smelting, the mercury content in the above-mentioned solid wastes is 20%, and the arsenic and selenium contents are both 5%.

[0035] (2) Put the solid waste and iron oxide after ball milling into industrial furnaces. Among them, the input amount of solid waste is 1000kg / h, and the input amount of iron oxide is 300kg / h. At an air flow rate of 100m 3 / h, under the condition that the pyrolysis treatment temperature is 600°C, the solid waste is pyrolyzed for 3 hours to obtain the pyrolysis flue gas. The iron oxide in th...

Embodiment 3

[0038] A method for recovering mercury in non-ferrous smelting solid waste, comprising the following steps:

[0039] (1) Take solid waste and alumina with a mass ratio of 1:0.1 for ball milling treatment for 6 hours. The ball-to-material ratio of the ball milling process is 4:1, and the ball milling speed is 800r / min. The main components of the above solid waste are Mercury-containing solid wastes such as fly ash and acid sludge produced by non-ferrous smelting. The mercury content in the above solid wastes is 20%, and the content of arsenic and selenium are both 0.01%.

[0040] (2) Put the solid waste and alumina after ball milling into industrial furnaces. Among them, the input amount of solid waste is 50kg / h, and the input amount of alumina is 10kg / h. At an air flow rate of 100m 3 / h, under the condition that the pyrolysis treatment temperature is 500°C, the solid waste is pyrolyzed for 0.5h to obtain pyrolysis flue gas. The alumina in the industrial furnace can absorb th...

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Abstract

The invention discloses a method for recovering mercury in nonferrous smelting solid waste. The method comprises the following steps of: performing ball milling treatment on mercury-containing solid waste and an arsenic-selenium fixing agent, performing pyrolysis treatment on the obtained mixed material, and condensing and recovering mercury from the pyrolysis flue gas. By adopting the method, toxic and harmful trace elements such as arsenic and selenium can be effectively inhibited from volatilizing into the flue gas, and mercury in the solid waste pyrolysis flue gas is efficiently recovered,so that mercury resources are recycled, the economic benefits of nonferrous smelting are improved, and environmental pollution is fully avoided.

Description

technical field [0001] The present invention relates to a method for recovering mercury in non-ferrous smelting solid waste, in particular to a method for using arsenic-selenium fixative to reduce the volatilization of volatile trace elements such as arsenic and selenium in solid waste, and at the same time improve the selectivity of mercury The method for volatilization recovery belongs to the field of mercury resource recovery. Background technique [0002] Mercury is a highly toxic heavy metal, which has the pollution characteristics of persistent existence, bioaccumulation and long-distance migration in the environment, and has been highly concerned by the international community. my country is currently the world's largest anthropogenic mercury emitter, and is facing enormous responsibility and pressure to reduce mercury pollution. Mercury emissions from the non-ferrous smelting industry account for more than 24% of the country's total mercury emissions. It is one of t...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B43/00
CPCC22B7/001C22B43/00Y02P10/20
Inventor 沈锋华刘恢向开松李焌源谢小峰刘操李超芳陈昊何书丹
Owner CENT SOUTH UNIV
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