含钛电炉熔分渣碱熔过程中 Ti元素的选择性富集及MgAl2O4的物相转化规律

以KOH为改性剂，利用渣碱共熔反应对攀钢含钛电炉熔分渣进行改性处理，成功地将炉渣中Ti元素从原来的重钛酸镁选择性地富集到偏钛酸钾中，同时渣中镁铝尖晶石和镁橄榄石转化为易溶于水的铝酸盐和硅酸盐.采用X射线衍射技术研究了共熔反应中煅烧温度、渣碱比(含钛电炉熔分渣的质量与KOH质量之比)、保温时间等对Ti元素迁移富集和镁铝尖晶石转化的影响.当渣碱比为1：2.1、煅烧温度700℃及保温时间1 h时，生成的偏钛酸钾衍射峰达到最强，镁铝尖晶石的衍射峰最弱，有效地实现了Ti元素的选择性富集及镁铝尖晶石的物相转化.实验证实了较高K/Ti比( K2 O与TiO2的摩尔比)是生成偏钛酸钾的主要原因.以最佳碱熔条件下得到的共熔渣为原料，经过后续处理，在850℃的条件下合成了六钛酸钾纳米晶须.

Selective enrichment of Ti element and phase transformation of MgAl2 O4 in titanium-containing electric furnace molten slag during the alkali fusion process

Using potassium hydroxide as a modifier, Ti element was selectively enriched in potassium metatitanate from titanium-containing electric furnace molten slag, and magnesium aluminium spinel and forsterite were successfully converted to aluminates and silicates after the alkali fusion reaction between potassium hydroxide and the slag. The effects of calcining time, alkali/slag mass ratio and calcining temperature on the enrichment of Ti element and the phase transformation of magnesium aluminate spinel were investiga-ted by X-ray diffraction analysis. When the alkali/slag mass ratio is controlled at 1:2. 1, the calcining temperature is 700℃ and the calcining time is 1 h, the highest diffraction peak of potassium metatitanate and the lowest diffraction peak of magnesium aluminium spinel appear, suggesting that the selective enrichment of Ti element and the phase transformation of magnesium aluminium spinel are efficiently realized. It is verified that a higher molar ratio of K2 O to TiO2 plays an important role in the formation of potassium metati-tanate. Using this alkali fusion slag obtained under the optimum conditions as raw materials, potassium hexatitanate nanowhiskers can be successfully synthesized by subsequent processing at 850℃.