The sulfate method was applied in industry in 1931 to produce the anatase form of titanium dioxide and later, in 1941, for production of the rutile form. In this method, the initial raw material – ilmenite concentrate or titanium slag – is dissolved in sulfuric acid, resulting in titanium, iron, and other metal sulfate solutions. Then, basic TiO2 with the necessary particle size is formed after a series of technological transformations, including chemical reduction, purification, precipitation, washing, and calcination. The crystal structure (anatase or rutile form) is controlled during nucleation and calcination.

The equation describes the sulfate method of the titanium dioxide process:

FeTiO₃ + 2H₂SO₄ → TiOSO₄ + FeSO₄ + 2H₂O TiOSO₄ + H₂O → TiO₂ + H₂SO₄.

The process diagram of TiO2 production using the sulfate method (with ilmenite as a raw material)

Hengyang Industry is an Chinese Company based in Zhengzhou city that manufactures, on proprietary technology, plants and equipment for waste recycling and recovery with energy production, material recovery or production of finished goods.

Innovation, R&D, passionate and skilled team along with the customer satisfaction have always been the success of Hengyang and they still are the peculiarities of our Company. Besides the historical Hengyang equipment, like single and double shafts shredders, Crushing machine, briquetting machines, separators, squeezers and centrifuges, the Company offers a wide range of turn-key plants, among which:

• briquetting and pelletizing plants
• shredding plants
• Waste Sorting Plants
• Bio-fuel Plants
• Waste to Power Recycling Plants
• Mining Plants
• OEM Equipments
……..
Hengyang is able to develop customized solutions too.
Designed, constructed and assembled by the same Hengyang

The Company policy focuses on product quality: robustness and functionality of the machines that maintain their value over time.
The ability to challenge ideas and concepts and to interact with partners worldwide has allowed and still allows Hengyang to stay highly competitive and to be an ideal partner for the world market.