Title:
METHOD FOR REMOVING ARSENIC AND IRON FROM ACIDIC WASTE SOLUTION GENERATED DURING ETCHING OF PRINTED CIRCUIT BOARDS
Document Type and Number:
WIPO Patent Application WO/2010/009611
Kind Code:
A1
Abstract:
A method for removing arsenic and iron from acidic waste solution generated during etching of printed circuit boards is provided, which involves the following steps: (1) Hydrated titanium dioxide is stirred in pulp. (2) The pH value of acidic waste solution generated during etching of printed circuit boards is adjusted to 0.5-3.0. (3) The hydrated titanium dioxide pulp is added to the acidic waste solution generated during etching of printed circuit boards with the adjusted pH value, stir-reacted for 5-45 minutes, and filtered. The method enables economical and effective removal of arsenic and iron simultaneously.
Inventors:
SONG CHUANJING (CN)
CHEN ZHICHUAN (CN)
CHEN CHANGMING (CN)
MAO ANZHANG (CN)
CHENG BAISEN (CN)
CHEN ZHICHUAN (CN)
CHEN CHANGMING (CN)
MAO ANZHANG (CN)
CHENG BAISEN (CN)
Application Number:
PCT/CN2009/000807
Publication Date:
January 28, 2010
Filing Date:
July 20, 2009
Export Citation:
Assignee:
SHENZHEN HAZARDOUS WASTE TREAT (CN)
SONG CHUANJING (CN)
CHEN ZHICHUAN (CN)
CHEN CHANGMING (CN)
MAO ANZHANG (CN)
CHENG BAISEN (CN)
SONG CHUANJING (CN)
CHEN ZHICHUAN (CN)
CHEN CHANGMING (CN)
MAO ANZHANG (CN)
CHENG BAISEN (CN)
International Classes:
C02F1/58; C02F1/64; C02F1/66; C02F9/04
Domestic Patent References:
| WO2006087432A1 | 2006-08-24 |
Foreign References:
| CN1872727A | 2006-12-06 | |||
| CN101323475A | 2008-12-17 | |||
| CN101215062A | 2008-07-09 |
Attorney, Agent or Firm:
SHENZHEN ZHONGZHI PATENT & TRADEMARK AGENT CO., LTD. (No. 1001 Shangbu Zhong RoadShenzhen, Guangdong 1, CN)
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