How to remove impurities

Generally, filtration or high-speed centrifugal filtration is used.

Organic impurities are difficult to remove because a small amount is dissolved in the solution and is not solid.

For reference: Removal of organic impurities in potassium salt galvanizing solution Potassium salt galvanizing has been widely used due to its environmental protection, energy saving, easy operation and other advantages. However, after the galvanizing solution is used for a long time, a large amount of organic decomposition products will accumulate in the plating solution. Black flowers will be produced on the surface of the galvanized layer during electroplating, which will affect the surface quality of the workpiece after passivation. The traditional method of treating organic decomposed impurities in galvanizing baths is to add hydrogen peroxide. However, with the application of new brighteners, there are more and more longer-chain and difficult-to-decompose organic compounds. If hydrogen peroxide is used for treatment, the decomposition of organic matter will be incomplete, the treatment cycle of the plating solution will be shortened, and the treatment cost will increase. When we deal with organic decomposed impurities in the galvanizing solution, we use the potassium permanganate method. Practice has proved that the treatment is thorough and the effect is good. 1. Plating solution treatment: Take 30mL of the plating solution, adjust the pH value of the plating solution to below 3, heat to 50-60°C, and gradually add potassium permanganate, 0.59 each time. At this time, it was found that a large amount of black MnoZ precipitate was formed. During the addition process, stir continuously and add sulfuric acid continuously to keep the pH value below 3. Because potassium permanganate has the strongest oxidizing ability under strong acidic conditions. When the solution appears slightly purple-red and can remain discolored for several minutes, it indicates that the amount of potassium permanganate added is sufficient. At this time, add 1 to 3 mIJL of hydrogen peroxide to react with the excess potassium permanganate. Use a sodium hydroxide solution with a concentration of several lmol to increase the pH value of the plating solution to 5-6. At this time, there is more Fe in the plating solution, which will turn into precipitation. According to re(oH), it can be deduced that when the pH value is above 3.5, the concentration of Fe and Yu will drop below 10-'mol/L. At the same time, when the pH value is 5-6, most heavy metal ions will be converted into precipitates. Press 2 to leave L and add zinc powder, stir 0.sh , then add 2 to 3 L activated carbon and stir 0.sh , perform filtering. Store excess hydrogen peroxide at 50-60°C and keep it warm 0.sh It can be removed under certain conditions and can be tested with starch potassium iodide test paper. The filtered solution is electrolyzed with 0.IA/d small current resistance for 1 to 2 hours. Analyze the content of each component in the plating solution, add more as needed, then add brightener, and test plating. source: http://info.pf.hc360.com/2008/03/17145080104.shtml

1 Using bromine water method (identification of methane and ethylene) 2 Acidic KMnO2 (H+) method (identification of benzene and its homologues) 3 Newly prepared Cu (OH) 2 and silver ammonia solution method (identification of - CHO) 4 Color development method (identification of phenol - OH) 5 Precipitation method, etc.~~

Choosing the right resin should solve the problem, everyone is discussing

Add with hydrogen to remove the unsaturated bonds inside

I don’t quite understand what Floor 9 said? My solution is an inorganic acid liquid with hydrogen gas flowing through it? ? ? ?