Preparation of TiCl 4 with the Titanium Slag Containing Magnesia and Calcia in a Combined Fluidized Bed

Abstract

This paper describes a new method for producing TiCl 4 by chloridizing materials of high content CaO and MgO, in which a combined fluidized bed is used as a reactor to avoid agglomeration between particles caused by molten CaCl 2 and MgCl 2. The combined fluidized bed consists of at least a riser tube and a semi-circulating fluidized bed. Two kinds of high titanium slag, in which the total mass content of CaO and MgO is 2.03% and 9.09% respectively, are employed to examine the anti-agglomeration effect and the conversion of the materials when the temperature ranges are between 923.15K and 1073.15K, gas apparent velocity 0.7–1.1m·s −1, and inlet amount of solid materials is 4.6–7.0kg·h −1. It is found that the anti-agglomeration effect in the combined fluidized bed is satisfactory and the new method can achieve a TiCl 4 production capacity of 14.0–75.4t·m −2·d −1 in relation to 25.0–40.0t.m −2·d −1 from the conventional bubble bed. Furthermore, low-temperature chloridization, for example, at 923 K or 973K, can also be used to produce TiCl 4 and avoid agglomeration.