钛渣制备人造金红石的试验研究

对钛渣制备人造金红石进行了研究,通过在高温下NaOH与钛渣中含硅矿物的反应,破坏对杂质铁形成包裹的硅酸盐,焙砂水浸脱硅后,再经酸浸除铁等杂质,煅烧得到TiO2含量大于92%的高品质人造金红石。通过考察影响因素,确定钛渣制备人造金红石最佳工艺参数。按钛渣中铝、硅含量理论计算的4.5倍摩尔比加入氢氧化钠混匀,在900℃焙烧2 h。焙砂在液固比1∶1、常温下水浸出1 h脱硅;水洗样在液固比4∶1,盐酸浓度18%,浸出温度90℃,浸出时间4 h条件下进行了酸浸除杂;酸浸样在900℃下煅烧1 h制备人造金红石产品。

The study on preparation of Synthetic rutile by titania slag

Study of synthetic rutile preparation by titania slag is present.Through the reaction between NaOH and the silica contained minerals in titania slag under high temperature,the silicates which includes the impurity iron is destroyed.After desilication by calcine leaching and iron impurity removal by acid leaching,the high quality synthetic rutile with TiO2 content over 92% can be obtained by calcinations.By examining the effecting factors,the optimize process parameters of synthetic rutile preparation by titania slag are determined.Adding 4.5 times molar ratio to theoretical calculated aluminum and silica content in titania slag of NaOH and uniformly mixed,roasting for 2 hours under temperature of 900℃.Under conditions of liquid and solid ratio 1∶ 1,the calcine shall be desilicated by water leaching 1 hour under normal temperature;under conditions of liquid solid ratio 4∶ 1,hydrochloric acid content 18%,leaching temperature 90℃,the acid leaching impurity removal is carried on by leaching for 4 hours.And the synthetic rutile can be obtained by roasting acid leaching product for 1hour under the temperature of 900℃