发明名称 |
WASTEWATER TREATMENT METHOD |
摘要 |
Provided is a wastewater treatment process capable of selectively and efficiently separating and removing a manganese precipitate with high purity from sulfuric acid-acidic wastewater containing aluminum, magnesium, and manganese. In the wastewater treatment for a sulfuric acid-acidic wastewater containing aluminum, magnesium, and manganese, a magnesium oxide is used for part or all of the neutralizing agent to be added, the magnesium oxide is produced through the following steps (1) to (4): (1) effluent wastewater obtained by separating aluminum and manganese from sulfuric acid-acidic wastewater is concentrated, and calcium contained in the effluent wastewater is precipitated as a calcium sulfate; (2) the solution obtained in (1) is further concentrated, and magnesium is precipitated and separated as a magnesium sulfate; (3) the magnesium sulfate separated in (2) is roasted together with a reducing agent to obtain a magnesium oxide and sulfurous acid gas; and (4) the magnesium oxide obtained in (3) is washed. |
申请公布号 |
EP3009407(A4) |
申请公布日期 |
2017.01.18 |
申请号 |
EP20140810962 |
申请日期 |
2014.05.15 |
申请人 |
Sumitomo Metal Mining Co., Ltd. |
发明人 |
OHARA, Hideki;OZAKI, Yoshitomo |
分类号 |
C02F1/58;C01F5/02;C02F1/04;C02F1/64;C02F1/72;C22B3/04;C22B3/44;C22B21/00;C22B23/00;C22B26/20;C22B26/22;C22B47/00 |
主分类号 |
C02F1/58 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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