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Recycling method of arsenic-containing gypsum slag

A gypsum slag, recycling technology, applied in the improvement of process efficiency, calcium/strontium/barium halide, calcium/strontium/barium fluoride, etc., can solve soil and water pollution, large amount of arsenic-containing waste, and treatment costs. Advanced problems, to achieve the effect of reducing process costs, reducing costs, and achieving recycling

Active Publication Date: 2018-12-21
湖南锐异资环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of hazardous solid waste arsenic-containing gypsum slag is produced during the treatment process, which has the problems of large amount of arsenic-containing waste, high treatment cost, and difficulty in recycling. At present, it is mainly disposed of by stockpiling
However, long-term stockpiling of arsenic-containing gypsum slag will cause soil and water pollution to varying degrees.

Method used

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  • Recycling method of arsenic-containing gypsum slag
  • Recycling method of arsenic-containing gypsum slag
  • Recycling method of arsenic-containing gypsum slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The gypsum slag produced by the conventional lime neutralization method of a lead and zinc smelting enterprise in Hunan is used as raw material, and its main components are shown in Table 1; take 1000 kg of the dried gypsum slag, and add powder with a mass of 20% of the gypsum slag mass. Mix the coal evenly, place it in a closed rotary kiln, and bake it at 1150°C for 60 minutes.

[0031] The flue gas volatilized during the roasting process is oxidized by blowing air to oxidize the metal element in the flue gas into oxides, and then cooled by the waste heat boiler (control the cooling temperature to ensure that the temperature of the flue gas entering the YT (intermetallic compound) membrane high-temperature filter is 360 ~400°C), cyclone dust collector, and YT membrane high-temperature filter to obtain heavy metal oxide dust, and the filtered flue gas is quenched to below 180°C to obtain high-arsenic soot.

[0032] After cooling the roasted product obtained, calcium sul...

Embodiment 2

[0038] The gypsum slag produced by the conventional lime neutralization method of a copper smelting enterprise in Yunnan is used as raw material, and its main components are shown in Table 2; 1000 kg of the dried gypsum slag is taken, and a powdered coal mixture with a mass of 25% of the gypsum slag mass is added. Evenly, put it in a closed rotary kiln, and bake it at 1300°C for 30min.

[0039] The flue gas volatilized during the roasting process is oxidized by blasting to oxidize the metal element in the flue gas into oxides, and then cooled by the waste heat boiler (control the cooling temperature to ensure that the temperature of the flue gas entering the YT membrane high-temperature filter is 360-400 ° C), Dust is collected by a cyclone dust collector and filtered by a YT membrane high-temperature filter to obtain metal oxide dust, and the filtered flue gas is quenched to below 180°C to obtain high-arsenic soot.

[0040] After cooling the roasted product obtained, calcium ...

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Abstract

The invention discloses a recycling method of arsenic-containing gypsum slag. The arsenic-containing gypsum slag is arsenic-containing gypsum slag produced in a waste acid neutralization process. Therecycling method comprises the following steps: (1) carrying out reduction roasting on the arsenic-containing gypsum slag by adopting a carbon reduction agent, so as to obtain arsenic-containing fluegas and roasting slag; (2) carrying out flotation separation on the roasting slag obtained in step (1), so as to obtain calcium sulfide concentrate and calcium fluoride slag. According to the recycling method disclosed by the invention, path opening of arsenic and fluorine in the gypsum slag and recycling of valuable metal are realized; influences caused by the fact that a lot of the arsenic-containing gypsum slag dangerous wastes are stacked and stored on the environment are solved, and the recycling method also has good economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a resource recovery method for arsenic-containing gypsum slag obtained after lime neutralization and sewage acid treatment. Background technique [0002] In 2017, the production capacity of China's top ten non-ferrous metals including copper, lead, zinc and aluminum reached 53.78 million tons, and the output of non-ferrous metals ranked first in the world. Acid) is one of the main wastewater produced in the metallurgical process. Sewage acid contains toxic heavy metal ions such as copper, lead, zinc, cadmium, antimony, indium and non-metal ions such as fluorine and arsenic, which are extremely harmful to the environment. [0003] The lime neutralization method has the advantages of high precipitation rate of arsenic and heavy metal ions and low treatment cost, and is currently one of the most important methods for domestic sewage acid treatment. However, a large am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/44C01F11/22C22B1/02
CPCC22B1/02C01B17/44C01F11/22C01P2006/80C01P2002/72Y02P10/20
Inventor 刘维梁超张添富谢龙臣龙森刘正良
Owner 湖南锐异资环科技有限公司
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