Ion exchange technology and treatment of gold adsorption resin

Ion exchange technology and treatment of gold adsorption resin This product is specially researched and developed for the recovery of gold in gilding solution in the electroplating industry. It is mainly used in the recovery of gold in gilding solution (gold cyanide and aurous cyanide solution), the adsorption of gold is clear, you can see a layer of gold gold attached to it, the adsorption speed is fast, the adsorption capacity is large, it can reach 300 (mass ratio), and the post-processing method is simple, and the fineness of the recovered gold is better. Welcome to buy and try gold adsorption resin. The ion exchange technology and the treatment of ion exchange technology have a long history. Some natural materials such as zeolite and sulfonated coal obtained by sulfonation of coal can be used as ion exchangers. With the rapid development of modern industrial technology for organiHowever, after chemical synthesis, many kinds of resins with excellent properties have been researched and developed, and various new application methods have been developed. Ion exchange technology has developed rapidly. widely used. In recent years, hundreds of resins have been produced at home and abroad, with an annual output of hundreds of thousands of tons.

Ion exchanger

Pretreatment of ion exchanger

1 .Ion exchange resin contains a certain amount of water, so it should not be stored in the open air. It should be kept moist during storage and transportation to prevent drying and drying in the air, which will cause the resin to break If the resin has dried out during storage, it should be washed with concentrated saline (10) Soak and gradually dilute, not directly in the water, to prevent the resin from swelling and breaking quickly.

2. Tideduring winter storage and transportation, it should be kept at a temperature of 5-40 °C to avoid overcooling or overheating, which will affect the quality. In winter, if there is no heat preservation equipment, the resin can be stored in salt water, the concentration of salt water can be determined by temperature.

Ion exchange resin

3. Industrial products of ion exchange resin often contain a small amount of low polymer and monomers that have not participated in the reaction, and also contain inorganic impurities such as iron, lead, copper, etc., when the resin comes into contact with water, acid, alkali or other solutions, the above substances will be transferred into the solution and affect the quality of the effluent. , the new resin must be pre-treated before use. Completely swell the resin with water, and then the inorganic impurities (mainly ironcompounds) are removed with 4-5 dilute hydrochloric acid, and the organic impurities can be removed with 2-4 dilute sodium hydroxide solution and washed until almost neutral. If it is used in the preparation of medicines, it must be soaked in ethanol.

4. While using the resin, avoid contact with metal (such as iron, copper, etc.) oil stains, organic molecular microorganisms, strong oxidants, etc., so as not to reduce the ion exchange capacity or even lose its function. Therefore, it should be based on Depending on the situation, the resin must be activated from time to time. The activation method can be determined according to the pollution situation and conditions. In general, the positive resin is easily contaminated by Fe during the annealing process, and it can be soaked in hydrochloric acid and then gradually diluted. The negative resin is easy to be contaminated by organic materials.terial, and 10NaCl+ Soak or rinse in 2-5NaOH mixed solution. If necessary, soak in 1 hydrogen peroxide solution for several minutes. Otherwise, alternative acid-base treatment can also be used., bleaching treatment, alcohol treatment and various sterilization methods and so on.

Ion exchange resin

5. Pre-treatment of new resin: Industrial products of ion exchange resin often contain a small amount of oligomers and unreacted It also contains inorganic impurities such as iron , lead and copper. When the resin comes into contact with water, acid, alkali or other solutions, the above substances will be transferred into the solution, which will affect the quality of the effluent. Therefore, new resins must be pre-treated before use. Generally, the resin is swollen with water first, and then the inorganic impurities (mainly iron compounds) can be removed with 4-5 diluted saltacid, and the organic impurities can be removed with 2-4 dilute sodium hydroxide solution and washed to near neutrality.

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