Method of removing particles having a size less than 10 .mu.m from an aqueous solution
AssigneePacific Metals Co., Ltd.
InventorsQingquan Su, Seinoshin Hayami, Hiroshi Sasaki
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Abstract
Provided is a method of removing particles having a size of less than 10 .mu.m from an aqueous solution. The pH of the aqueous solution is first adjusted to be less than 9 and then the aqueous solution is passed through an absorbent of mineral fiber, containing 35 to 65 wt % of SiO.sub.2 and 65 to 35 wt % of at least one oxide selected from the group consisting of MgO, CaO, Al.sub.2 O.sub.3 and FeO. The particles in the aqueous solution adhere to the absorbent and are separated from the aqueous solution. The absorbent is regenerated by passing a descaling solution having a pH greater than 10 through the absorbent. The particles are recovered as a concentrated solution.
Claims14
A method of removing particles having a size of less than 10 .mu.m from an aqueous solution comprising the steps of:
- adjusting the pH of the aqueous solution to less than 9;
- passing the aqueous solution through an absorbent comprising mineral fiber, the mineral fiber comprising 35 to 65 wt % of SiO.sub.2 and 65 to 35 wt % of at least one oxide selected from the group consisting of MgO, CaO, Al.sub.2 O.sub.3 and FeO, whereby the particles in the aqueous solution adhere to the absorbent and are separated from the aqueous solution;
- and
- passing a descaling solution having a pH greater than 10 through the absorbent to regenerate the absorbent and to recover the particles as a concentrated solution.
A method of removing solid particles having a size of less than 10 .mu.m from an aqueous solution comprising the steps of:
- adjusting the pH of the aqueous solution to between 5 and 9;
- passing the aqueous solution through an absorbent comprising mineral fiber, the mineral fiber comprising 35 to 65 wt % of SiO.sub.2 and 65 to 35 wt % of at least one oxide selected from the group consisting of MgO, CaO, Al.sub.2 O.sub.3 and FeO, whereby the solid particles in the aqueous solution adhere to the absorbent and are separated from the aqueous solution;
- and
- passing a descaling solution having a pH greater than 10 through the absorbent to regenerate the absorbent and to recover the solid particles as a concentrated solution.
A method of removing liquid particles having a size of less than 10 .mu.m from an aqueous solution comprising the steps of:
- adjusting the pH of the aqueous solution to less than 9;
- passing the aqueous solution through an absorbent comprising mineral fiber, the mineral fiber comprising 35 to 65 wt % of SiO.sub.2 and 65 to 35 wt % of at least one oxide selected from the group consisting of MgO, CaO, Al.sub.2 O.sub.3 and FeO, whereby the liquid particles in the aqueous solution adhere to the absorbent and are separated from the aqueous solution;
- and
- passing a descaling solution having a pH greater than 10 through the absorbent to regenerate the absorbent and to recover the liquid particles as a concentrated solution.
Dependencies are inferred from the claim text.