High-efficiency treatment method for arsenic chemical wastewater

An arsenic chemical and wastewater technology, applied in chemical instruments and methods, precipitation treatment, natural water treatment, etc., can solve problems such as unsatisfactory desalination effect, blockage of equipment pipelines, affecting normal reuse, etc., to achieve stable treatment effect and reduce Processing cost, energy saving effect

Inactive Publication Date: 2018-04-24
红河砷业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desalination effect of the lime precipitation method in the treatment of arsenic chemical wastewater is not ideal, which affects the normal reuse of treated water
In the actual operation of the lime precipitation method equipment, due to the excessive calcium, magnesium and other impurities in the water, it is easy to cause blockage of the equipment pipeline and affect the normal production
When the concentrated distillation method is used to treat arsenic chemical wastewater, the wastewater must be boiled, which requires a lot of energy consumption, high operating costs, and the temperature in the concentration tank is too high, which imposes strict requirements on the subsequent equipment condensation tower and produces secondary tail gas. The environment causes secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After the arsenic chemical wastewater has been left to stand for 10 hours, pump the 20L intermediate liquid of the arsenic chemical wastewater to a small vacuum distillation device to start vacuum distillation. The steam pressure in the heating section is 0.15MPa. After the temperature rises to 85°C, adjust the steam heating The pressure is 0.05MPa, continue to heat up to 88°C, enter the heat preservation section, the heat preservation section has a heating steam pressure of 0.05MPa, and a vacuum degree of 0.02MPa. The content of arsenic in the condensate obtained after vacuum distillation is 39mg / L, Na + It is 19mg / L, reaching the recycling standard of arsenic chemical products.

Embodiment 2

[0019] After the arsenic chemical wastewater has been left to stand for 11 hours, pump the 4L intermediate liquid of the arsenic chemical wastewater to a small vacuum distillation device to start vacuum distillation. The steam pressure in the heating section is 0.17MPa. After the temperature rises to 85°C, adjust the steam heating The pressure is 0.05MPa, continue to heat up to 86°C, enter the heat preservation section, the heat preservation section has a heating steam pressure of 0.05MPa, and a vacuum degree of 0.021MPa. The content of arsenic in the condensate obtained after vacuum distillation is 89mg / L, Na + It is 17mg / L, reaching the recycling standard of arsenic chemical products.

Embodiment 3

[0021] After the arsenic chemical wastewater has been left to stand for 12 hours, pump the 4L intermediate liquid of the arsenic chemical wastewater to a small vacuum distillation device to start vacuum distillation. The steam pressure in the heating section is 0.20MPa. After the temperature rises to 85°C, adjust the steam heating The pressure is 0.05MPa, continue to heat up to 90°C, enter the heat preservation section, the heat preservation section has a heating steam pressure of 0.05MPa, and a vacuum degree of 0.022MPa. The content of arsenic in the condensate obtained after vacuum distillation is 86mg / L, Na + It is 19mg / L, reaching the recycling standard of arsenic chemical products.

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PUM

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Abstract

The invention discloses a high-efficiency treatment method for arsenic chemical wastewater. The method comprises the following steps: treating high-salt arsenic-containing wastewater through reduced-pressure distillation; adding the arsenic chemical wastewater into a standing slot for standing precipitation so as to layer the arsenic chemical wastewater; pumping the arsenic chemical wastewater intermediate liquid layered by standing into a reduced-pressure distillation concentration kettle for reduced-pressure distillation treatment, wherein after the reduced-pressure distillation, the condensate water quality reaches an arsenic chemical product reuse water standard in which the arsenic content is lower than 100mg / L and the Na<+> content is lower than 50mg / L. The method disclosed by the invention has the advantages of simple equipment, low production cost and no secondary pollution; and the condensate water quality can meet the requirement on arsenic chemical product reuse water.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment methods. Background technique [0002] The existing technologies for treating arsenic chemical wastewater mainly include lime precipitation and concentrated distillation. The desalination effect of the lime precipitation method in the treatment of arsenic chemical wastewater is not ideal, which affects the normal reuse of the treated water. In the actual operation of the lime precipitation method equipment, due to the excessive calcium, magnesium and other impurities in the water, it is easy to cause the blockage of the equipment pipeline and affect the normal production. When the concentrated distillation method is used to treat arsenic chemical wastewater, the wastewater must be boiled, which requires a lot of energy consumption, high operating costs, and the temperature in the concentration tank is too high, which imposes strict requirements on the subsequent equipment ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/10C02F101/20C02F103/34
CPCC02F1/04C02F1/52C02F9/00C02F2001/007C02F2101/103C02F2101/20C02F2103/34
Inventor 段铭诚黄文伟李学鹏尹久发
Owner 红河砷业有限责任公司
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