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Preparation method of macroporous weak-base anion exchange resin special for gold extraction

A technology for exchanging resins and anions, applied in anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of poor mechanical strength and low exchange capacity, and achieve high mechanical strength, controllable specific surface area, and good mechanical strength Effect

Pending Publication Date: 2021-06-29
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a special macroporous weak base anion exchange resin for gold extraction. By regulating the preparation process of cross-linked styrene-divinylbenzene microspheres, the obtained cross-linked styrene-divinylbenzene microspheres The matrix has the advantages of high mechanical strength, controllable specific surface area, and adjustable pore size. On this basis, the weak base anion exchange resin for gold extraction also has a controllable pore structure and good mechanical strength. Selective adsorption, large gold exchange capacity and good wear resistance, solves the problems of low exchange capacity and poor mechanical strength of traditional ion exchange resins for gold extraction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of cross-linked styrene-divinylbenzene microsphere matrix

[0020] Add: 240g water, 1.2g gelatin, 0.1mL of 1wt% methylene blue solution to a 500ml three-necked flask equipped with a mechanical stirrer, a thermometer and a condenser, and heat until the gelatin dissolves. An oil phase containing 80 g of styrene, 20 g of divinylbenzene, 1 g of benzoyl peroxide and 100 g of isobutanol was added, and then nitrogen gas was passed into the mixed solution for 5 minutes, and mechanical stirring was started, and the stirring speed was adjusted to 170 rpm. The temperature was slowly raised to 85°C for 6h. After finishing the reaction, the system was separated from solid and liquid, and washed several times to obtain a solid product. Then, the porogen and the remaining impurities in the pores of the resin are removed by Soxhlet extraction to obtain the cross-linked polystyrene-divinylbenzene microsphere matrix.

[0021] (2) Chloromethylation of cross-linked styren...

Embodiment 2

[0027] (1) Preparation of cross-linked styrene-divinylbenzene microsphere matrix

[0028] Add 240 g of water, 1.8 g of hydroxyethyl cellulose, and 0.1 mL of 1 wt % methylene blue solution to a 500 ml three-necked flask equipped with a mechanical stirrer, a thermometer, and a condenser, and heat until the hydroxyethyl cellulose dissolves. Add an oil phase containing 70 g of styrene, 30 g of divinylbenzene, 1 g of benzoyl peroxide and 100 g of n-heptane, then blow nitrogen into the mixed solution for 5 min, turn on mechanical stirring, and adjust the stirring speed to 180 rpm. Slowly heat up to 95 ° C for 8 hours. After finishing the reaction, the system was separated from solid and liquid, and washed several times to obtain a solid product. Then, the porogen and the remaining impurities in the pores of the resin are removed by Soxhlet extraction to obtain the cross-linked polystyrene-divinylbenzene microsphere matrix.

[0029] (2) Chloromethylation of cross-linked styrene-div...

Embodiment 3

[0035](1) Preparation of cross-linked styrene-divinylbenzene microsphere matrix

[0036] Add 240 g of water, 1.2 g of polyvinyl alcohol, and 0.1 mL of 1 wt % methylene blue solution to a 500 ml three-necked flask equipped with a mechanical stirrer, a thermometer, and a condenser, and heat until the polyvinyl alcohol dissolves. Add the oil phase containing 85g styrene, 15g divinylbenzene, 1g benzoyl peroxide and 60g cyclohexane, then pass nitrogen into the mixed solution for 5min, turn on the mechanical stirring, and adjust the stirring speed to 200rpm. Slowly heat up to 90 ° C for 8 hours. After finishing the reaction, the system was separated from solid and liquid, and washed several times to obtain a solid product. Then, the porogen and the remaining impurities in the pores of the resin are removed by Soxhlet extraction to obtain the cross-linked polystyrene-divinylbenzene microsphere matrix.

[0037] (2) Chloromethylation of cross-linked styrene-divinylbenzene

[0038] S...

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Abstract

The invention discloses a preparation method of macroporous weak-base anion exchange resin special for gold extraction. According to the invention, a crosslinked styrene-divinylbenzene microsphere matrix obtained by regulating and controlling a preparation process of crosslinked styrene-divinylbenzene microspheres has the advantages of high mechanical strength, controllable specific surface area, adjustable aperture and the like; the weak-base anion exchange resin special for gold extraction, synthesized on the basis of the crosslinked styrene-divinylbenzene microsphere matrix also has a controllable pore structure and pore size distribution, and can realize selective adsorption with the gold element; and the total exchange capacity of the resin is 2.0-4.5 mmol / g, the gold element exchange capacity is 30-240 mg per g of dry resin, wear resistance is good, and the problems of low exchange capacity, poor mechanical strength and the like of traditional special gold extraction ion exchange resin are solved.

Description

Technical field: [0001] The invention relates to the field of functional polymer materials, in particular to a preparation method of a macroporous weak base anion exchange resin special for gold extraction. Background technique: [0002] Gold has unique physical and chemical properties, and has long been used in currency circulation and precious decorations, and is also widely used in aviation, medical, industry, materials and other fields. my country's gold resources are mainly divided into three categories: rock gold deposits, placer gold deposits and associated gold. The particle size of gold in gold deposits is unevenly distributed, often associated with silver, copper, iron, palladium, nickel, selenium and other elements. The gold extraction process from gold mines is mainly divided into two categories: physical method (gravity separation method and flotation method) and chemical-hydrometallurgy method. The chemical method mainly uses chemical reagents to treat gold o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/14C08F212/08C08F212/36C08F8/32C08F8/24C22B11/00C22B3/24C22B7/00
CPCB01J41/14C08F8/32C08F8/24C22B11/042C22B3/24C22B7/006C08F212/08Y02P10/20
Inventor 陈新德徐文萍陈雪芳熊莲张海荣
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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