CN-116891283-B - Copper ion capturing agent suitable for wide-pH-range depth, preparation method and application thereof

Abstract

The invention discloses a copper ion trapping agent suitable for a wide pH range, a preparation method and application thereof, wherein the trapping agent comprises, by mass, 10-30 parts of trithiocarbonate, 5-20 parts of N, N-dimethylamino dithioformate and 1-5 parts of sodium dihydrogen citrate. The preparation method comprises (1) adding water into sodium dihydrogen citrate solution, stirring to obtain buffer solution A, and (2) adding trithiocarbonate and N, N-dimethylamino dithioformate into buffer solution A, stirring to dissolve completely, and filtering. The method has the advantages of wider pH application range, copper removal effect changing along with water quality, stable copper removal effect, high reaction speed, rapid floc sedimentation and the like, and after treatment, the concentration of copper ions is less than 0.1mg/L, the iron content is less than 0.0001%, and the lead content is less than 0.0001%, thereby meeting the environmental protection emission requirement.

Inventors

• XIONG JIANGLEI
• LU HONGQING
• WU JIANHUA
• JIANG QINGQING
• GAO YAGUANG
• ZHANG XUCHU

Assignees

• 中国电子系统工程第二建设有限公司

Dates

Publication Date

20260505

Application Date

20230712

Claims (3)

1. 1. The application of the copper ion scavenger suitable for the wide-pH-range depth in the treatment of copper-containing waste liquid in the electronic industry is characterized in that the copper-containing waste liquid is taken, the pH value of the copper-containing waste liquid is adjusted to 7-11, the copper ion scavenger suitable for the wide-pH-range depth is added into the copper-containing waste liquid, and the copper ion scavenger suitable for the wide-pH-range depth comprises, by mass, 10-30 parts of trithiocarbonate, 5-20 parts of N, N-dimethyl amino dithioformate, 1-5 parts of sodium dihydrogen citrate, and further comprises a coagulant aid, wherein the coagulant aid comprises 0.2-0.5 part of sodium carboxymethyl cellulose, 0.5-2 parts of dextran and 1-2 parts of sodium hydrosulfide.
2. 2. The application of the wide-range-pH-adaptive depth copper ion scavenger in the treatment of copper-containing waste liquid in the electronic industry according to claim 1, wherein the preparation method of the wide-range-pH-adaptive depth copper ion scavenger comprises the following steps: (1) Adding water into a sodium dihydrogen citrate solution, and stirring to prepare a buffer solution A; (2) Adding trithiocarbonate and N, N-dimethylamino dithioformate into the buffer solution A, and stirring until the trithiocarbonate and the N, N-dimethylamino dithioformate are completely dissolved; Adding sodium carboxymethyl cellulose, dextran and sodium hydrosulfide into the dissolved system, mixing and dissolving, and filtering to obtain the pH wide-range deep copper ion scavenger.
3. 3. The application of the copper ion scavenger with wide pH range and depth in copper-containing waste liquid treatment in the electronic industry according to claim 1, wherein the adding amount of the copper ion scavenger with wide pH range and depth is 5-10 times of the copper content in each liter of copper waste liquid.

Description

Copper ion capturing agent suitable for wide-pH-range depth, preparation method and application thereof Technical Field The invention relates to a copper ion capturing agent for treating copper wastewater, a preparation method and application thereof, in particular to a copper ion capturing agent suitable for a wide pH range and depth, a preparation method and application thereof. Background With rapid development of industrial production and urban modernization, copper wastewater is commonly used in electroplating, electronic industry and metallurgical industry, and copper wastewater has complex components, is classified according to copper-containing elements in the copper wastewater except cyanide-containing wastewater and acid-base wastewater, and can be generally classified into chromium-containing wastewater, nickel-containing wastewater, cadmium-containing wastewater, copper-containing wastewater, zinc-containing wastewater, gold-containing wastewater, silver-containing wastewater and the like. The discharge of copper wastewater brings serious harm to the environment and human health. At present, the method for treating the copper wastewater is more, such as a chemical precipitation method, an electrochemical method, a membrane separation method, an ion exchange method and the like, but has the defects of high investment cost, high operation cost, easiness in secondary pollution, over-narrow pH application range, unsatisfactory copper removal effect and the like. Among the copper-containing wastewater treatment methods, the copper scavenger method has the advantages of high reaction efficiency, high sludge precipitation speed, good selectivity and the like, but has the defects of narrow applicable pH range, large fluctuation of the copper content of the effluent along with water quality change, loose treated flocs and difficult sedimentation in practical engineering application. Disclosure of Invention The invention aims to provide the copper ion scavenger which can effectively and stably remove copper under the condition of water quality fluctuation, is difficult to loosen and is easy to settle and is suitable for the wide-pH-range depth of copper ion scavenger; a second object of the present invention is to provide a method for preparing the above-mentioned pH-adapted wide-range depth copper ion scavenger; it is a third object of the present invention to provide the use of the above-described copper ion scavenger adapted to a wide range of pH depths. The copper ion capturing agent suitable for the wide pH range and depth comprises, by mass, 10-30 parts of a mixture of trithiocarbonate and 5-20 parts of N, N-dimethylamino dithioformate, and 1-5 parts of sodium dihydrogen citrate. The coagulant aid also comprises 0.2-0.5 part of sodium carboxymethyl cellulose and 0.5-2 parts of glucan. Wherein, also comprises 1-2 parts of sodium hydrosulfide. The preparation method of the copper ion capturing agent suitable for the wide-range depth of pH comprises the following steps: (1) Adding water into a sodium dihydrogen citrate solution, and stirring to prepare a buffer solution A; (2) Adding trithiocarbonate and N, N-dimethylamino dithioformate into the buffer solution A, stirring until the trithiocarbonate and the N, N-dimethylamino dithioformate are completely dissolved, and filtering to obtain the pH wide-range deep copper ion scavenger. In the step (2), 1-2 parts of sodium carboxymethyl cellulose, 0.5-2 parts of glucan and 1-2 parts of sodium hydrosulfide are added into the dissolved system, and the mixture is mixed and dissolved to obtain the copper ion scavenger with wide pH range and depth. The application of the copper ion scavenger adapting to the wide pH range and depth in the treatment of copper-containing waste liquid in the electronic industry. Wherein, the copper-containing waste liquid is taken, the pH value is adjusted to 7-11, and the copper capturing agent with wide pH range and depth is added into the copper-containing waste liquid. The adding amount of the deep copper capturing agent in the wide pH range is 5-10 times of the copper content in each liter of copper waste liquid, and the reaction time is 30-60min. The principle of the invention: The pH of a water sample to be treated is regulated to be close to or above neutral, a proper amount of copper ion scavenger is added, the pH is kept stable through the buffer of sodium dihydrogen citrate, firstly copper ions are respectively subjected to complexation precipitation with-CS 3 in trithiocarbonate and N-CS 2 in N, N-dimethyl amino dithioformate to obtain precipitates with two sizes, S 2- in sodium hydrosulfide and copper ions generate relatively fine sulfide precipitates, and the obtained three kinds of non-uniform fine precipitates are more easily combined with active groups such as hydroxyl groups, phenolic hydroxyl groups and the like in sodium carboxymethyl cellulose and dextran, and the fine flocs are combined into larger flocs which