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Oxidant dosage and temperature affect the two elements of polyferric sulfate basicity


Affect the amount of oxidant PFS basicity : Under normal temperature and pressure , adding quantitative FeSO4 6 17H2O86g, concentrated H2SO4 (98%) 4mL, H2O100mL in the flask, slowly add 3,6,9 , ? ? 12,14 g different amounts of KClO3, after measuring its response basicity . Since potassium chlorate was added to the ferrous sulfate solution , the reaction will release a lot of heat , so inevitably consume part of potassium chlorate will decompose . To this end , the oxidation process using hydrogen peroxide slowly added dropwise at a low temperature , the color of the solution gradually deepened. After several experiments found that when the molar ratio of potassium chlorate with a capacity of 6g, ferrous sulfate and potassium chlorate is 1:0.1 , the color red-brown liquid produced no deeper explanation Fe2 + has basically been oxidized , to the experimental requirements , continue to increase The amount of potassium chlorate , solution volume increases, total iron content decreased . Accordingly , ferrous sulfate and potassium perchlorate select the molar ratio of 1:0.1 .

Ferric salt of the effect of temperature : for most chemical reactions, when the same concentration of reactants was heated to improve the reaction rate. The experimental results show that, under other conditions remain unchanged , when the reaction temperature (℃) , respectively 30, 35 , 40,45,50 , 55, 60 and 65 , the PFS basicity B (%) respectively. to 8.7,8.8,9.7 , 10.2 , 11.9 , 13, 11.4 and 10.8 . Seen, PFS basicity increases with increasing reaction temperature , when the reaction temperature rose to 55 ℃, basicity PFS has reached a high level, the magnitude of change continues to heat up basicity not large . Since the reaction is exothermic experiment , if the temperature is too high , on the one hand cause partial decomposition of the oxidant in order to achieve the same effect , will increase the amount of oxidant ; the other hand , high temperatures can cause the decomposition of ferric sulfate precipitation , reduce flocculation capacity. Taken together, the reaction temperature is about 55 ℃ more appropriate.

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