Low-cost chelating composite heavy metal scavenger and its preparation method and application

Abstract

The invention relates to a low-cost chelated compound type heavy metal capturing agent, and a preparation method and application thereof. The low-cost chelated compound type heavy metal capturing agent is characterized by being prepared from water-soluble poly(hydroxymethyl acrylamide)-graft-(sodium polyvinyl amino ethylene glycol diethyl ether diamine tetraacetate)-random-sodium polyvinyl amino dithiocarbamate), sodium di-n-butyl dithiocarbamate, water and potassium hydroxide, and the low-cost chelated compound type heavy metal capturing agent is used for treating heavy metal wastewater discharged in electroplating, smelting, mining, beneficiation, chemical engineering, machinery and the like. The heavy metal capturing agent provided by the invention has low cost and convenient operation,and a large aggregate can be generated in a plurality of seconds, so that rapid sedimentation can be realized.

Description

technical field [0001] The invention belongs to the field of water treatment technology and polymer functional materials, and specifically relates to a low-cost chelating composite heavy metal catching agent and its preparation method and application; the low-cost chelating composite heavy metal catching agent is mainly used for electroplating, smelting, mining, It is widely used in mineral processing, chemical industry, machinery and other industries that discharge heavy metal wastewater. 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 mainl...

AI Technical Summary

Problems solved by technology

The Chinese patent discloses "a polymer of polyethylene diamine tetraacetic acid unit", and its publication number is CN 106986432A. It has good heavy metal chelating ability and can be widely used in various heavy metal wastewater industries and soil remediation ; but there are some technical defects: (1) Most complex electroplating wastewater is acidic wastewater, which cannot be added directly, and the pH value needs to be adjusted to neutral to alkaline to effectively settle; (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 is average, and each unit chemical structure can only provide 3 ingredients. Bit atoms 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.