Inorganic Chemicals Industry >
Effect of reaction condition and aging process on the oxidation rate of chromium hydroxide
Received date: 2020-12-23
Online published: 2021-10-11
Chromium hydroxide is an important form of chromium in secondary resources containing chromium,and is also the main product in the reduction of pollutants containing hexavalent chromium.It is of great significance to study the oxida-tion process to extract chromium resources and control chromium pollution.Chromium hydroxide samples were prepared by reduction of sodium dichromate using sodium sulfite.The effect of oxidation temperature（room temperature~200 ℃）,oxida-tion time（0~168 h） and additives（Na2CO3、Na2SO4） on the oxidation process of chromium hydroxide samples was investigated experimentally.An oxidation equation was selected and the kinetic fitting calculation was carried out.The results showed that the higher temperature,the more sufficient of the oxidation reaction of the two chromium hydroxide samples and the greater the oxidation rate.Under the condition of no additives,the oxidation rate K value of newly prepared and aged chromium hydro-xide at 200 ℃ was 617 and 4 375 times of that at 80 ℃,respectively.The addition of additives would promote its oxidation reac-tion.At 140 ℃,when Na2CO3 and Na2SO4（Na∶Cr molar ratio was 0.2） were added to the newly prepared chromium hydroxide,the oxidation rate K value was 10 and 4 times of that without addition,respectively.The oxidation rate K value was 1.4~1.9 times of that of the aged chromium hydroxide sample,which may be related to have more bound water.
Key words： chromium hydroxide; aged; bound water; oxidation reaction; reaction kinetics
Shuai Jiao , Shouzhi Yi , Hongling Zhang , Huixia Chen , Xichuan Cheng , Lichang Zhang , Hongbin Xu . Effect of reaction condition and aging process on the oxidation rate of chromium hydroxide[J]. Inorganic Chemicals Industry, 2021 , 53(10) : 59 -63 . DOI: 10.19964/j.issn.1006-4990.2020-0695
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