Chemical equation for deionized water equipment
Ferric chloride. Chemical formula FeC4. Products are divided into solid and liquid. The solid state is brown-green crystal, and the content (mass fraction) of ferric chloride (including crystal water, FeCl2 6H2O) in the first-class product (deionized water equipment) and the qualified product is 98.7%, %6%, More than 93%. The content (mass fraction) of ferric chloride in the first-class and first-class qualified products in the liquid products is above 44%, 41% and 38%. In addition to the active ingredients, the main differences in product grades are the content of ferrous iron and insoluble matter. The coagulation effect of iron salt is better than that of aluminum sulfate, and the produced flocculent particles are large and dense, and the precipitation is good. The disadvantage is that the solution is very corrosive, and the color of the effluent is higher than that of aluminum salts.
Ferrous sulfate. The chemical formula is FeSO4, and the solid contains 7 crystal waters. The content (mass fraction) of FCS0O47TH20 in the first-class products (deionized water equipment) and qualified products of solid products should not be less than 97%, 94%, and 90%. In addition to the active ingredients, the main difference between product grades is the content of free acid and insoluble matter. The divalent iron in ferrous sulfate can only act as a coagulant after being oxidized to trivalent iron. Oxidation methods include chlorination and air oxidation. Usually chlorination is used. The chlorine added by the prechlorination oxidizes the ferrous iron to ferric iron. Oxidation can also be carried out by aerating the dissolved oxygen in the water when the pH of the water is higher than 8. Ferrous sulfate is difficult to produce high-priced polymers after oxidation, and its coagulation effect is lower than that of ferric chloride.
53 alloy. Polymeric iron coagulants, such as polyferric sulfate and polyferric chloride, are newly developed products and are not widely used at present. The direction of research and development is to develop iron salt coagulants similar to polyaluminum chloride, which can produce high-valent polymer ions and have good coagulation effect.
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