Alkaline heavy metal chelating agent

Abstract

The invention discloses an alkaline heavy metal chelating agent. The alkaline heavy metal chelating agent is prepared from the following components in parts by weight: 50-80 parts of an ethanol watersolution, 1-10 parts of diphenylthiourea, 10-16 parts of ethylene diamine tetraacetic acid disodium, 6-15 parts of ammonium citrate, 4-23 parts of glycolic acid, 6-18 parts of sodium gluconate, 6-12 parts of sodium polyacrylate, 2-5 parts of aluminum hydroxide, 1-3 parts of carbonate and 1-3 parts of sodium hydroxide, wherein the volume ratio of ethanol to water of the ethanol water solution is 2:(0.5-1). According to the alkaline heavy metal chelating agent, a metal chelating agent body and an alkaline compound are effectively combined and compounded, a product with the efficient alkaline heavy metal removal rate effect is obtained, and the the alkaline heavy metal chelating agent is low in treatment cost, environmentally friendly, safe, non-toxic, suitable for being used in a large areain multiple fields and especially suitable for acid polluted water to be treated.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, specifically relates to the technical field of metal chelating agents, in particular to an alkaline heavy metal chelating agent. Background technique [0002] Heavy metal pollution refers to the environmental pollution caused by elements with significant biological toxicity such as Hg, Cd, Pb, Cr, and As, and general heavy metals with certain toxicity, such as Zn, Cu, Co, Ni, Sn and other elements and their compounds. It has the following characteristics: ①A small amount can produce significant toxic effects. Generally, heavy metals can produce toxic effects in the range of 1.0-10mg / L, and the range of significant toxicity is 0.001-0.1mg / L; ②It cannot be degraded by microorganisms. On the contrary, some heavy metals Under the action of microorganisms, it will be transformed into more toxic metal-organic substances, such as mercury into alkylmercury; ③ After being ingested by orga...

AI Technical Summary

Problems solved by technology

However, in practical application, this type of heavy metal trapping agent has the following disadvantages: First, it is toxic and harmful to aquatic organisms

Second, due to the partial vacancy of the chelating group and other reasons, it is necessary to use an excessive amount of heavy metal scavenger several times to make the heavy metal ions in the wastewater reach the standard, resulting in the treated wastewater containing a certain concentration of heavy metal scavenger, causing damage to the environment and causing The water color is yellowish

However, in reality, most metal chelating agents are acidic, and many pollution sources are rich in acidic substances, resulting in a large amount of acidic compounds remaining in the water body, which is generally acidic. Therefore, the treatment process generally requires the acidic water body to be treated to Adjust the pH to alkaline, and then use a metal chelating agent, which undoubtedly increases the workload of the treatment process, and at the same time, the metal removal efficiency is also greatly reduced