文章摘要：
Progress on Manufacturing Method of Inorganic
Polymer Coagulant Polyferric salt category
Li Mingyu
( Department of Environmental Engineering, Jinan University, Guangzhou 510632, China. E-mail: liming-yu@sohu.com)
Abstract: This paper gives a review of the manufacturing ......
alyzing oxidation were sodium nitrite, manganese dioxide or chloride. At present, the most production companies of PFS use this method.
The manufacture of PFS with ferrous sulfate and sulfuric acid was reported firstly by Japan patent[4]. When sodium nitrite and air were used as catalyst and oxidizer respectively, the mechanism of catalyzing oxidation can be showed as follows:
2FeSO4 + H2SO4 + 2NaNO2 ＝ 2Fe(OH)SO4 + Na2SO4 + 2NO (7)
FeSO4 + NO ＝ Fe(NO)SO4 (8)
2Fe(NO)SO4 + 1/2 O2 + H2SO4 ＝ Fe2(SO4)3 + 2NO + H2O (9)
2NO + O2 ＝ 2NO2 (10)
2NO + 1/2 O2 ＝ N2O3 (11)
2FeSO4 + N2O3 + H2O ＝ 2Fe(OH)SO4 + 2NO (12)
or 2FeSO4 + N2O3 + H2SO4 ＝ Fe2(SO4)3 +2NO + H2O (13)
2FeSO4 + NO2 + H2O ＝ 2Fe(OH)SO4 + NO (14)
or 2FeSO4 + NO2 + H2SO4 ＝ Fe2(SO4)3 +NO + H2O &nb 上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >>
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