Ultrafast settlement type composite heavy metal capturing agent, and production method and application thereof

Abstract

The invention relates to an ultrafast settlement type composite heavy metal capturing agent, and a production method and an application thereof. The ultrafast settlement type composite heavy metal capturing agent is prepared from water-soluble polymethylolacrylamide-grafted-(sodium polyvinylaminocyclohexanediacetate-random-polyvinylaminodithiocarbamate), sodium di-n-butyldithiocarbamate, water andpotassium hydroxide, and the ultrafast settlement type composite heavy metal capturing agent is used to treat heavy metal wastewater discharged in the processes of electroplating, smelting, mining, mineral separation, chemical engineering and mechanical engineering. The capturing agent has a low cost, each basic unit can provide hexacoordination atoms to carry out strong chelating adsorption, andcommonly act together with the sodium di-n-butyldithiocarbamate to adsorb complexation type heavy metal ions, and can be compounded with heavy metals in an ultrafast manner to generate a large aggregation in seconds to achieve rapid settlement, so the capturing agent is convenient to operated, and is conducive to be promoted.

Description

technical field [0001] The invention belongs to the field of water treatment technology and polymer functional materials, and specifically relates to an ultra-fast sedimentation composite heavy metal scavenger and its production method and application, which are mainly used in electroplating, smelting, mining, mineral processing, chemical industry and machinery, etc. Discharge of heavy metal wastewater industry. Background technique [0002] Heavy metal wastewater mainly comes from electroplating, smelting, mining, mineral processing, chemical and machinery industries. The heavy metal-containing wastewater produced by these industries is discharged into natural water bodies, which not only poses a threat to aquatic organisms, but may also be continuously enriched in organisms through the food chain, eventually endangering human health. Traditional methods of heavy metal wastewater treatment mainly include chemical precipitation, heavy metal scavenger precipitation, ion exch...

AI Technical Summary

Problems solved by technology

[0004] In recent years, new heavy metal scavenger has become a research hotspot. A Chinese patent has disclosed an invention application named "polymer of polyethylene diamine tetraacetic acid unit", and its publication number is CN 106986432A, which has better heavy metal chelation It can be widely used in various heavy metal wastewater industries and soil remediation; but it has some technical defects: (1) Most complex electroplating wastewater is acidic wastewater, which cannot be added directly; the pH value needs to be adjusted from neutral to alkaline (2) Under alkaline conditions, the feeding ratio of the new heavy metal scavenger is difficult to control, and excessive feeding will easily lead to slow precipitation or no precipitation and anti-dissolution; (3) The chelating ability of the new heavy metal scavenger Generally, the chemical structure of each unit can only provide 3 coordination atoms to participate in the chelation reaction, and the treatment effect on highly complexed heavy metal wastewater is not good; (4) The preparation cost of the new heavy metal scavenger is high, and it is difficult to popularize and use

[0005] Sodium di-n-butyldithiocarbamate (TP) is often used as a vulcanization accelerator for natural rubber, styrene-butadiene rubber, neoprene and latex, and is rarely used directly as a heavy metal scavenger. The main reason is that TP is effective for low-concentration heavy metal wastewater The sedimentation performance is poor

[0006] In short, the sedimentation rate of existing heavy metal scavenger is usually affected by factors such as functional groups, feed ratio, pH, etc.

The factor of feeding ratio is the most difficult to control. Excessive feeding will easily lead to slow sedimentation rate, and less feeding will easily lead to incomplete precipitation of heavy metals.