The higher the quality of titanium concentrate and rutile, the better the effect of the exercise; when the rutile content is higher than 90% and the titanium concentrate content is higher than 50%, the recovery rate is higher; Placer ore is better than the effect of primary ore exercise. The higher the ratio of iron oxide to iron oxide in titanium concentrate, the better the firing effect before exercise, and the better the economic and technical performance. The particle size of titanium concentrate and rutile should be appropriate, too fine and easy to fly increases the loss; too large, aluminum thermal reaction is not enough, the recovery rate is reduced; Therefore, the particle size of rutile is generally manipulated in 100-160 mesh, the titanium concentrate manipulation particle size in 40-100 mesh. The ratio of titanium concentrate to rutile should be approximately 3.5:1. The firing temperature is usually controlled at 750°C - 850°C, the firing time is 3-5h, no firing temperature and too short time will affect the thermal effect of the plant and the recovery reaction is fully realized, the recovery rate is an adverse effect.
Production of ferro-titanium with aluminum particles, the higher the grade, the more favorable for the reduction reaction, the common choice is the aluminum content of 98% or more aluminum particles. The size of the aluminum particles affects the chemical reaction rate and the use of aluminum, the aluminum particles are too large, the surface area is small, the chemical reaction interface lasts a long time, is not conducive to heat collection, and the iron slag is not easy to separate, of the iron there are fewer aluminum particles are too small, the scuttling and burning losses are increased, together with the aluminum particles too small in the alumina, the amount increases, constituting the lack of aluminum, affecting the recovery of titanium.
The silicon ferrosilicon in the alloy can form with the titanium compound Ti5Si3 and other compounds, blocking the composition of the aluminum compounds, reducing the amount of aluminum in the alloy, improving the utilization rate of aluminum, and then contributing to the progress of the reduction rate of titanium.
The factors influencing the thermal effect of the plant are: (1) the heat of the chemical reaction of the charge. (2) the physical heat introduced by the charge. The heat of the chemical reaction mainly depends on the grade and dosage of titanium concentrate, rutile, potassium chlorate and aluminum particles and other materials, the physical heat mainly depends on the calcining temperature of titanium concentrate and rutile. Production practice shows that the calorific value is low, the reduction reaction is difficult to realize, the mobility of slag is poor, there are more titanium-containing metal balls in the slag, the slag iron is not easy to separate, the amount of iron; The calorific value is high, the reaction is intense, the agitation of slag is a spattering, the loss process is large, low production value.
