发明名称 |
Menetelmä ferrosulfaatin käsittelemiseksi |
摘要 |
The invention concerns a method for treating ferrous sulphate for the preparation of ferrous sulphate hydrate usable for chromium reduction in cement manufacture. According to the invention, sulphuric acid containing ferrous sulphate obtained as a side product from titanium dioxide production and which contains at the most appr. 30 % by weight of sulphuric acid, is neutralized with a CaO-containing material, preferably cement, in an amount sufficient to give a pH-value to the end product which is 1.5 to 5, whereby the reaction temperature is allowed to increase to at the most 120 DEG C.
|
申请公布号 |
FI951922(A) |
申请公布日期 |
1996.10.22 |
申请号 |
FI19950001922 |
申请日期 |
1995.04.21 |
申请人 |
FINNSEMENTTI OY;KEMIRA PIGMENTS OY |
发明人 |
ERIKSSON, BO-ERIK;MATTILA, HARRI |
分类号 |
C01G49/14;C04B22/14;(IPC1-7):C01G49/14;C04B7/00 |
主分类号 |
C01G49/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|