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 method of inorganic high polymer coagulant polymerized ferric sulfate. The present situation of the studies and the production of PFS is discussed. It points out the merit and the shortcoming of the manufacturing methods of PFS with ferrous sulfate, pyrite cinder and other slags containing iron. Some suggestions about present problems and development direction in the production of PFS have been put forward.

Key words  Polyferric sulfate, ferrous sulfate, coagulant, pyrite cinder

Introduction

    Polymerized ferric sulfate(PFS) is a new inorganic high polymer coagulant. Its molecular formula is Fe₂(OH)_n(SO₄)_3-n/2]_m, (n>2, m=f(n) ). It can be used in waste water treatment and the purification of drinking water^[1]. Compared with general inorganic coagulants, for example, ferrous sulfate, ferric chloride, aluminum chloride, aluminum sulfate, alum floc and polymerized aluminum chloride(PAC) , PFS is the best coagulant. Its coagulating ability is strong, sinking speed is quick, and producing cost is low. In addition, the leaving of aluminum is more in the water treated with the coagulants containing aluminum, and it is harmful to the health of human body^[2]. This restricts the development of aluminum coagulants, and particularly in drinking water treatment. Nevertheless, the leaving of ferric is little in the water treated with PFS, and it is not harmful to human body. At the same time, PFS is also superior to organic coagulants such as polyacrylamide(PAM) in some industrial wastewater treatment^[3]. When PFS substituted for PAM in water treatment, the harm of monomer AM, which was left in water after PAM was degraded, could be avoided. So the application prospect of PFS is very good and the market competition power is stronger in industrial wastewater treatment, industrail using water, and life drinking water.

    In 1972, Japan put forward PFS as one of coagulants, and applied for the first patent^[4] of PFS made from ferrous sulfate. Then industrial scope production and application in water treatment were formed. China started the studies of PFS in 80's early . The manufacture of PFS made from ferrous sulfate was developed successfully by Tianjin Research Academies of Chemical Industry under Ministry of Chemical Industry of China in 1982. The pr

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