发明名称 |
Method for removal of nickel and iron from alkali metal hydroxide manufacturing process requiring the use of sodium borohydride |
摘要 |
The method involves the steps of: exposing a cell liquor containing metal to a first magnet, magnetically removing up to about one third of said metal present in the cell liquor, evaporating a significant amount of water out of that fluid, and raising the temperature of that fluid to above 220 Fahrenheit and adding a small amount of sodium borohydride (NaBH4) to suppress the reaction of the caustic solution with metal in the manufacturing process, evaporating and flashing off more water from the caustic solution, cooling the solution after evaporation and then flowing it through and around a second magnet to magnetically removing an additional amount of metal the solution, filtering the solution and then magnetically removing an additional amount of metal from said solution forming a final caustic solution having 40-55% by weight caustic.
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申请公布号 |
US6080299(A) |
申请公布日期 |
2000.06.27 |
申请号 |
US19990419685 |
申请日期 |
1999.10.14 |
申请人 |
PIONEER (EAST) INC. |
发明人 |
HEGEMAN, JOHN WILLIAM;PICKLE, TODD RICHARD;SULIK, GARY LEE |
分类号 |
C01D1/28;(IPC1-7):C25B1/34 |
主分类号 |
C01D1/28 |
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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