The main production methods for titanium dioxide are the sulfuric acid process and the chloride process. The sulfuric acid process involves reacting titanium concentrate or acid-soluble titanium slag with sulfuric acid to undergo acidolysis, yielding a titanium oxysulfate solution. This solution is then hydrolyzed to obtain metatitanic acid precipitate, which is subsequently calcined in a rotary kiln to produce TiO2. The sulfuric acid process is primarily a batch operation, offering high flexibility in production equipment and facilitating start-up, shutdown, and load adjustments.
In recent years, my country's titanium dioxide industry has experienced several-fold growth in capacity, output, and market demand, ushering in a period of prosperity. Simultaneously, the growth rate of rutile titanium dioxide production has also accelerated. Therefore, the selection of drying equipment for titanium dioxide has become paramount, as it is crucial to the quality of the material. Based on the material characteristics of titanium dioxide and the assimilation of advanced foreign equipment and technologies, a domestically developed high-speed rotary flash dryer has been successfully applied in titanium dioxide drying.
The flash dryer mainly consists of an air inlet system, a heating system, a feeding system, a drying host, a material collection and dust removal system, an exhaust system, and a control system. During operation, wet material enters the drying chamber via a screw feeder. Inside, the material encounters high-speed rotating hot air. Fine powder is carried upwards by the hot air, while material that cannot be carried falls to the bottom and is broken up by a crushing device. This rapid dispersion increases the contact area between the material and the hot air. Under centrifugal force (with a grading device at the top), products reaching a certain degree of dryness and fineness are blown out of the grading device. The material is rapidly dried in this process.
Flash dryers, as a new type of equipment, offer high thermal efficiency, short drying time, and good energy savings. Currently, the 1400 and 1600 models are commonly used in the titanium dioxide industry. Our company will continue to uphold technological innovation in the titanium dioxide industry, continuously improve its innovation capabilities, and contribute to the sustainable development of the titanium dioxide and drying industries.
