Acid hydrolysis of ilmenite with titanium oxide sulfate

Titanium oxysulfate is an important inorganic chemical raw material, non-toxic and harmless to health. It is a significant white pigment, accounting for 80% of all white pigment usage. More than 90% of the titanium ore mined worldwide is used for the production of TiO2 pigments. In 1998, the world's total consumption of TiO2 pigments was 3.55 million tons, with a total value of 7 billion US dollars at a unit price of 2000 US dollars per ton, making it the third largest inorganic chemical product after synthetic ammonia and phosphoric acid. Many developed countries classify it as a key chemical, and in some countries and regions, its production is directly proportional to the gross domestic product. It has become an important indicator for measuring a country's economic development and people's living standards.

Hot air enters the bottom of the dryer through the inlet pipe at a suitable spraying speed and enters the mixing, crushing, and drying chamber, causing strong shearing, blowing, and rotating effects on the material. As a result, the material is subjected to centrifugation, shearing, collision, and friction, and is atomized, enhancing mass and heat transfer. At the bottom of the dryer, larger and wetter particle clusters are mechanically crushed under the action of the agitator. Particles with lower moisture content and smaller particle size are carried up by the rotating airflow and further dried during the upward process. Due to the rotating flow of gas-solid phases, the inertia of the solid phase is greater than that of the gas phase, and the relative velocity between the solid and gas phases is higher, which enhances the heat and mass transfer between the two phases. Therefore, the production intensity of this machine is high.

The titanium salt industry is the fundamental raw material industry for metallurgy, with over 90% of titanium ore used to produce pigment grade titanium dioxide (titanium dioxide). Titanium dioxide is widely used in industries such as coatings, plastics, papermaking, chemical fibers, rubber, and cosmetics due to its non-toxic and harmless properties, strong covering performance, high whiteness, and high weather resistance. In view of the problems of high waste, high energy consumption, and high toxicity in the traditional production process of titanium dioxide by sulfuric acid method and chlorination method, a new technology for clean production of titanium dioxide by alkali molten salt method has been proposed, which has strong applicability of raw materials, high atomic utilization rate, recyclable medium, and controllable products. This technology mainly includes five steps: (1) Alkali melting: mixing high titanium slag or natural hematite with NaOH at 500 ° C? Preparation of Sodium Titanate α - Na2TiO3 via C Calcination. （2） Washing: α - Na2TiO3 obtained acid soluble precursor solid NaxH2-xTiO3 through three water washes and one acid wash. （3） Acid dissolution: NaxH2-xTiO3 is acid hydrolyzed to form titanium oxysulfate solution (commonly known as titanium solution). （4） Hydrolysis: Dehydration and condensation of titanium oxide sulfate in titanium solution to prepare white precipitated metatitanic acid (HTD).