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 ......
he effect of catalysts and oxidizers on the speed of catalysis oxidizing reaction, literature [6] reported that the trace catalyst promoter of HG-1, HG-2, or HG-3 could notably raise the speed in the reaction system of oxygen and sodium nitrite. This made not only the consumption of catalyst decreases one a third but the reaction times shorten two thirds.
In a word, sodium nitrite was generally used as the catalyst in the process of catalysis oxidizing reaction. It shoud be pointed out that sodium nitrite is a carcinogen, and some nitric oxides were let in the process. This results in environmental pollution. In order to simplify technology, cut down the cost of product and decrease pollution, the development direction of PFS made with the catalysis oxidizing method should be studying and improving further the manufacturing technology, and developing new catalysts and catalyst promoters which are high effective and nonpoisonous.
2 Manufacture of PFS with slag or waste residue
It is a good method of turning waste into useful product to manufacture PFS from slag or waste residue containing oxide compound of iron. It can not only solve the three-waste problem, and also cut down the cost of PFS, simplify manufacturing technology, have better economic benefit.
2.1 Manufacture of PFS with pyrite cinder
Pyrite cinder can be as a raw material of PFS. This is one of major methods preparing PFS with slag or waste residue. A vast amount of pyrite cinder is produced in the producing course of sulfuric acid. Its main components are ferric oxide and ferriferrous oxide. At the aspect of the comprehensive utilization of pyrite cinder, the greater part of pyride cinder was used as an assistant in the production of cement.
In general situation, total iron content is about 65~65% in pyrite cinder and ferric content is 96.5% in total iron. After pyrite cinder is dissolved in sulfuric acid, the filtrating can directly be used in the manufacture of PFS. This has developed another better way for the comprehensive utilization of pyrite cinder. The manufacturing method of PFS using pyrite cinder is economical, and its cost is also lower. At present, many progresses had been made in this aspect[19-22].
The manufacturing process of PFS using pyrite cinder may be divided into two steps. The first step is that pyrite cinder is dissolved in sulfuric acid:
Fe3O4 + 4H2SO4 = Fe2(SO4)3 + FeSO4 + 4H2O (18)
Fe2O3 + 3H2SO4 = Fe2(SO4上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >>
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