C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/28 (2006.01)
Patent
CA 2097191
Abstract There is provided a method of treating aqueous solution containing fine particles to separate and recover fine particles, and clean the aqueous solution in a simple manner. Mineral absorbent comprizing SiO2 by 35-65 wt% and the rest being one or more than one oxides selected from MgO, CaO, Al203 and FeO is used. Aqueous solution after being adjusted its pH to be less than 9 is made to pass through the packed layer of absorbent where above explained absorbent is packed therein. In the aqueous solution having a pH of less than 9, the absorbent is positively charged whereas most fine particles are negatively charged so that fine particles tend to adhere to the absorbent due to the electric attracting force existing between them. When a descaling solution having a pH greater than 10 is brought into contact with a absorbent where fine particles have been adhered as a results of the preceeding treatment, both of the fine particles and absorbent become negatively charged and the fine particles is removed from the absorbent in to the descaling solution due to the electric repelling force existing between them.
Hayami Seinoshin
Sasaki Hiroshi
Su Qingquan
Goudreau Gage Dubuc
Pacific Metals Co. Ltd.
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