Method for preparing chitosan resin for extracting noble metals from bittern

A technology of chitosan resin and precious metals, applied in the field of preparation of chitosan resin, can solve the problems of limited effect and high cost, and achieve the effects of stable structure, good acid resistance and good chemical adaptability

Inactive Publication Date: 2010-04-28
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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Problems solved by technology

[0005] Aiming at the low concentration of precious metal ions in seawater, the extraction methods of the prior art have problems such as high cost and limited effect, the present invention introduces a preparation method of a novel chitosan resin, which involves cross-linking and modifying chitosan and adding silica gel , made

Method used

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Embodiment

[0023] Weigh 4g chitosan (molecular weight: 500,000, degree of deacetylation > 85%), add 200ml 2vt% glacial acetic acid solution, and magnetically stir for about 3h to completely dissolve chitosan to obtain a 2wt% chitosan solution. Under constant stirring, 1 ml of formaldehyde was added dropwise to the chitosan solution, and reacted for 1 hour to prepare Schiff base chitosan. Add 5wt% sodium hydroxide solution dropwise to the system to keep the pH of the system at 10, slowly add 3ml of epithichloropropane dropwise, raise the temperature to 70°C, and react for 15h under stirring. Filter, wash the filter cake with water until neutral, add 100ml of 5wt% hydrochloric acid, and hydrolyze for 5h at room temperature. After filtering, the filter cake is washed with water until neutral, and dried in an infrared drying oven to obtain a cross-linked chitosan resin. Take 2 g of the above-mentioned cross-linked resin, add 100 ml of 5wt% sodium hydroxide solution to make it swell, slowly ...

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Abstract

The invention discloses a method for preparing chitosan resin for extracting noble metals from bittern, which comprises the steps of preparing a chitosan glacial acetic acid solution, synthesizing cross-linked chitosan and preparing silica gel-loaded cross-linked chitosan resin. By performing crosslinking modification on the chitosan through crosslinking reaction and adding silica gel into the chitosan to prepare the silica gel-loaded cross-linked chitosan resin, the method combines the chemical stability of the silica gel with the high adsorbability of the chitosan, improves the adsorptive selectivity of the chitosan resin material by introducing a hydrosulfide group with special adsorbability to noble metal ions, and overcomes the defects that single chitosan resin is difficult to granulate, and has a small specific weight, poor mechanical strength and the like. The prepared silica gel-loaded cross-linked chitosan resin has the advantages of low cost, high efficiency, simple process, no pollution and the like, is used for extracting the noble metals from sweater bittern, has a large adsorption capacity, and has good effects of enriching, separating and reclaiming trace noble metals. Besides, the resin is convenient to reproduce and can be used repeatedly.

Description

technical field [0001] The invention relates to a precious metal ion adsorbent, in particular to a preparation method and application of chitosan resin used for extracting precious metals in brine. Background technique [0002] Precious metals such as gold and silver have excellent physical and chemical properties, high catalytic activity and strong coordination ability, etc., and are widely used in many fields of modern industry. With the continuous growth of the development and utilization of precious metals in the world, the reserves of precious metal resources on land have declined sharply, the grades have become lower and lower, and mining has become more and more difficult. [0003] Seawater contains rich mineral resources, including a large amount of precious metals. Although the concentration is low, the total amount of metals is very considerable due to the large amount of seawater. The total amount of gold is about 5 million tons, and the total amount of silver is ...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08K3/36C08B37/08B01J20/30B01J20/26
Inventor 高春娟张雨山黄西平蔡荣华张慧峰曹冬梅
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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