METHOD FOR RECOVERING CERIUM OXIDE FROM WASTE LIQUID OF CERIUM OXIDE POLISHING AGENT FOR OPTICAL POLISHING AND NON-POLLUTING TREATMENT METHOD FOR WASTE LIQUID OF CERIUM OXIDE POLISHING AGENT FOR OPTICAL POLISHING

Title:

Document Type and Number:

Japanese Patent JP3413394

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a method for recovering cerium oxide from the waste liquid of a cerium oxide polishing agent for optical polishing and a non-polluting treatment method for the waste liquid of the cerium oxide polishing agent for optical polishing which are efficient, are low in a treatment cost, save labor and are extremely high in practicable value.
SOLUTION: An alkaline component is added into the waste water of the cerium oxide polishing agent to regulate the waste liquid to an alkaline solution of a pH 7 to 11, and after the zeta potential of the waste liquid is changed to -25 to -70 mV, the cerium oxide components are subjected to separation treatment as well as other solid components to separation treatment.

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Inventors:

Toyohisa Fujita

Application Number:

JP2000217057A

Publication Date:

June 03, 2003

Filing Date:

July 18, 2000

Export Citation:

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Assignee:

Sumio Hosokawa

International Classes:

B24B57/02; B01D21/01; B03B5/28; B24B37/00; C02F1/52; C09K3/14; (IPC1-7): C02F1/52; B01D21/01; B03B5/28; B24B37/00; B24B57/02; C09K3/14

Domestic Patent References:

JP200134107A
JP2001329250A
JP2001121144A
JP2000263441A
JP2000254659A
JP2000126768A
JP11138162A
JP11121408A
JP1128338A
JP10118899A
JP8115892A

Other References:

【文献】実用新案登録3072151(JP,U)

Attorney, Agent or Firm:

Kenzo Fukuda (2 outside)

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