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Method for removing heavy metal ions from electroplating wastewater

A technology for heavy metal ions and electroplating wastewater, applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage treatment, etc. The effect of good water quality and large amount of treated water

Inactive Publication Date: 2012-09-19
SHENZHEN KEEN ENVIRONMENTAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China discharges millions of tons of red mud every year. Not only can a large amount of red mud not be fully and effectively utilized, but it also relies on large-area storage yards, occupying a large amount of land and causing serious pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] The pyrite slag is crushed into particles with a particle size of 80 mesh, acidified with 0.1mol / L hydrochloric acid solution, alkaline leached with 2.0mol / L sodium hydroxide, dried and activated at 800°C for 2 hours to obtain activated Pyrite slag.

example 2

[0022] Crush phosphogypsum into particles with a particle size of 100 mesh, acidify with 0.1mol / L hydrochloric acid solution in turn, carry out alkaline leaching with 2.0mol / L sodium hydroxide, and dry and activate at 800°C for 2 hours to obtain activated phosphogypsum .

example 3

[0024] The obtained activated pyrite slag and activated phosphogypsum were added to the red mud, and the dosages of pyrite slag and phosphogypsum accounted for 20% and 10% of the total mass respectively; adding water to the red mud mixture obtained above, Stir evenly, then evaporate at high temperature to a moisture content of 60%; use sodium hydroxide to adjust the pH value of the electroplating wastewater to 8.5, add the above-mentioned treated red mud mixture to the electroplating wastewater, and the amount added is 2 per liter of electroplating wastewater gram, stir rapidly for 20 minutes, and stand still for 30 minutes. After the suspended sludge particles settle, separate the solid from the liquid, and the supernatant can be discharged up to the standard.

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PUM

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Abstract

The invention discloses a method for removing heavy metal ions from electroplating wastewater, and belongs to the field of wastewater treatment. The method includes the steps of step 1, crushing pyrite cinder into particles with 80-100-meshed particle size to obtain activated pyrite cinder; step 2, crushing phosphogypsum into particles with 80-100-meshed particle size to obtain activated phosphogypsum; thirdly, adding the activated pyrite cinder obtained in the step 1 and the activated phosphogypsum obtained in the step 2 into red mud; fourthly, adding water into the obtained red mud mixture,mixing well, and evaporating at high temperature till moisture content reaches 55%-65%; and fifthly, adding the treated red mud mixture into the electroplating wastewater, performing solid-liquid separation after suspended sludge particles settle, and allowing supernate to be discharged standardly. The method has the advantages that process flow is simple, running, operation and management are convenient, investment is low, energy consumption is low and the like. Therefore, comprehensive utilization of waste is achieved, treatment of wastes with processes of wastes against one another is achieved, and the wastes are turned into wealth.

Description

technical field [0001] The invention discloses a method for removing heavy metal ions in electroplating wastewater, belonging to the technical field of sewage treatment in environmental protection. Background technique [0002] Electroplating wastewater is wastewater and waste liquid discharged from electroplating factories (or workshops), such as rinsing water for plating pieces, aqueduct liquid, equipment wastewater, and surface water for washing. Nickel or cadmium, cyanide, etc. Some heavy metal ions in wastewater exist in the form of simple cations (such as Ni 2+ 、Cu 2+ etc.), some exist in the form of acid radical anions (such as CrO 2- etc.), and some exist in the form of complex complex anions (such as [Cu(CN) 3 ] 2- 、[Au(CN) 3 ] 2- wait). Generally, wastewater often contains more than one harmful component. For example, cyanide and cadmium plating wastewater contain both cyanide and cadmium. In addition, the general plating solution often contains organic ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/62C02F103/16
Inventor 雷春生雷思宇龙海燕
Owner SHENZHEN KEEN ENVIRONMENTAL CO LTD
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