发明名称 |
A PROCESS FOR THE PRODUCTION OF TITANIUM DIOXIDE USING AQUEOUS FLUORIDE |
摘要 |
<p>A process is described for the production of titanium dioxide by the treatment with ammonium fluoride of titanium ores containing iron; the process comprises the following steps : (a) the titanium ore containing iron is reacted with an aqueous NH<SUB>4</SUB>F and/or NH<SUB>4</SUB>HF<SUB>2</SUB> solution; (b) the aqueous dispersion thus obtained is filtered with consequent separation of a solid residue and an aqueous solution containing titanium salts; (c) the aqueous solution thus obtained is subjected to hydrolysis, the hydrolysis comprising a first stage at pH 7.0-8.5 and a second stage at pH 10.0- 13.0; (d) the aqueous dispersion thus obtained is filtered and the solid residue is subjected to pyrohydrolysis, the pyrohydrolysis comprising a first stage at a maximum temperature of 450 °C and a second stage at a maximum temperature of 1000 °C.</p> |
申请公布号 |
WO2006077203(A1) |
申请公布日期 |
2006.07.27 |
申请号 |
WO2006EP50214 |
申请日期 |
2006.01.16 |
申请人 |
BRETON SPA;GORDIENKO, PAVEL S. |
发明人 |
GORDIENKO, PAVEL S. |
分类号 |
C01G23/053;C09C1/24;C09C1/36 |
主分类号 |
C01G23/053 |
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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