Method for preparing chitosan resin for extracting noble metals from bittern

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 ...

AI Technical Summary

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 of silica gel-loaded cross-linked chitosan resin, which combines the chemical stability of silica gel and the high adsorption of chitosan, improves the adsorption selectivity of chitosan resin materials, and improves the extraction of low-concentration precious metal ions in seawater brine Efficiency and reduced extraction costs