| Original document(8 pages) Authorized document(7 pages) 中文版 |
This invention is characterized by the comprehensive treatment which combines the rinsing waste water treatment eith zinc plating technology. Ferric salts produced due to the rust-removing procedure are utilized to reduce hezavalent chromium carrieed over by plating surfaces after low chromium passivating into trivalent chromium, while the alkaline liquid carried over by plating surfaces after zinc plating is used to reversely neutralize the acid solution on plating surfaces after rust-removing. This invention offers the advantages of a large saving in processing water; treating waste by waste without additional expense; treating waste water contg. hexavalent chromium simply and conveniently; saving in raw materials (including plating liquid, rinsing acid solution and alkaline materials required for acid neutralizing ) etc. |
Application Number
申请号 |
87102036 |
Application Date
申请日 |
1987.06.13 |
| Title 名称 |
Treatment for rinsig waste water from low chromium passivating process during zinc plating |
Publication Number
公开号 |
1015420 |
Publication Date
公开日 |
1987.12.23 |
| Approval Pub. Date |
|
Granted Pub. Date |
1990.05.02 |
| International Classification 分类号 |
C02F1/66,C02F1/70,C25D21/20 |
Applicant(s) Name
申请人 |
Zhuzhou Electric Locomotive Plant, Ministry of Railways |
| Address 地址 |
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| Inventor(s) Name 发明人 |
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| Attorney & Agent 代理人 |
WANG QIXIA |
| More information 更 多 信 息 |
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