The ilmenite-chloride process has used for the production of TiCl₄ from the ilmenite (FeTiO₃) ore, which produces cyclone dust containing mostly iron chloride and includes a range of metal chlorides. The utilization of iron values present in waste chlorides of cyclone dust is becoming a crucial issue to make this process competitive. The current work demonstrates a beneficial process that can selectively separate iron values from the chloride residue. Using CaCO₃ as a precipitating agent, the iron component was selectively isolated from the aqueous solution of the chloride residues. The selective extraction of iron was carried out at a wide range of concentrations, and the yield of iron species was over 95%. The precipitate is in the form of Fe(OH)₃, which converts to Fe₂O₃ when annealed in air. In the next step, the remaining metal impurities were removed as solid precipitates through the pH tuning with CaO. Finally, CaCl₂ and CaCO₃ were obtained by adding CO₂ to the residual solution. This study provides a method of treating cyclone residues to recover CaCl₂ as well as Fe(OH)₃, which represents significant progress towards the utilization of iron-rich wastes.

钛铁矿-氯化物工艺已用于从钛铁矿（FeTiO ₃）矿石生产TiCl ₄，该矿石产生的旋风除尘器主要含有氯化铁，并包含多种金属氯化物。利用旋风除尘废氯化物中存在的铁价已成为使该工艺具有竞争力的关键问题。当前的工作证明了一种有益的工艺，该工艺可以选择性地从氯化物残留物中分离出铁。使用CaCO ₃作为沉淀剂，从氯化物残留物的水溶液中选择性地分离出铁成分。对铁的选择性提取是在很宽的浓度范围内进行的，铁的收率超过95％。沉淀物为Fe（OH）形式₃，在空气中退火时转化为Fe ₂ O ₃。在下一步中，通过用CaO进行pH调节，以固体沉淀物的形式除去残留的金属杂质。最后，通过向残余溶液中添加CO ₂来获得CaCl ₂和CaCO ₃。这项研究提供了一种处理旋风残渣以回收CaCl ₂以及Fe（OH）_3的方法，这代表了在利用富铁废物方面的重大进展。