Elements affecting the recovery of ferro-titanium
The higher the quality of titanium concentrate and rutile, the better the exercise effect; when the grade of rutile is above 90% and the grade of titanium concentrate is above 50%, the recovery rate is higher; alluvial ore is better than the exercise effect of primary ore. The higher the ratio of ferrous oxide and iron oxide in titanium concentrate, the better the roasting effect before exercise, and the better the economic and technical indexes. Titanium concentrate and rutile particle size should be appropriate, too fine and easy to fly increase the loss; too coarse, aluminum thermal reaction is not sufficient, the recovery rate decreases; therefore, the rutile particle size is generally manipulated in the 100-160 mesh, titanium concentrate particle size manipulation in the 40-100 mesh. The ratio of titanium concentrate and rutile should be kept at about 3.5:1. Roasting temperature is generally controlled at 750 ° C - 850 ° C, the roasting time is 3-5h, the lack of roasting temperature and the time is too short will affect the unit thermal effect and the recovery reaction is fully carried out, the recovery rate constitutes an adverse effect.
Production of ferro-titanium with aluminum particles, the higher the grade, the more favorable to the recovery reaction, the general selection of aluminum content of 98% or more of the aluminum particles. Aluminum particle size will affect the speed of chemical reaction and aluminum utilization, aluminum particles too coarse, small surface area, interface chemical reaction lasts a long time, is not conducive to the collection of heat, and slag iron is not easy to separate, out of the iron less aluminum particles are too fine, fluttering and incineration loss increases, together with the aluminum particles are too fine in the alumina amount increases, constituting a lack of aluminum, affecting the recovery of titanium.
Ferrosilicon silicon in the alloy can be formed with titanium junction Ti5Si3 and other compounds, blocking the composition of aluminum compounds, reducing the amount of aluminum into the alloy, improve the utilization rate of aluminum, and then conducive to the progress of titanium recovery rate.
Factors affecting the thermal effect of the unit are: ① chemical reaction heat of the charge. ② physical heat brought in by the charge. Chemical reaction heat is mainly by the titanium concentrate, rutile, potassium chlorate and aluminum particles and other materials grade and dosage amount of decision, physical heat is mainly by the titanium concentrate and rutile roasting temperature decision. Production practice shows that the unit calorific value is low, the recovery reaction is difficult to carry out, slag mobility is poor, there are more titanium-containing metal balls in the slag, slag iron is not easy to separate, the amount of iron; unit calorific value is high, the reaction is intense, slag churning constitutes splashing, the process of loss of large, low production value.
