Tinox Chemical Co., Ltd.

Titanium dioxide is an important inorganic chemical product, which has important applications in coatings, ink, paper making, plastic rubber, chemical fibers, ceramics and other industries. Titanium dioxide is a white pigment of titanium dioxide. Titanium dioxide is a polycrystalline compound with regular particle arrangement and lattice structure. The production process of titanium dioxide includes sulphate process and chloride process.

TINOX is a titanium dioxide supplier originated from Dusseldorf Germany, with the manufacturing cost up-rising in EU. TINOX has to shift the manufacturing to China. So since 2019, TINOX gradually put the investment into China mainland both technically and capitally. Investing the technology and equipment into China enpower TINOX products with better economical value without compromising on quality.

In the sulfate process, ilmenite (FeTiO3), a common iron/titanium oxide material, is used. It is treated with concentrated sulfuric acid (H2SO4) and the titanium oxygen sulfate (TiOSO4) is selectively extracted and converted into titanium dioxide.

1. Ilmenite is treated (digested) with a 60% excess of concentrated sulfuric acid at a temperature around 100 °C. The following reaction takes place:

FeTiO3 + 2H2SO4 → FeSO4 + TiOSO4 + 2H2O

2. In the next stage, the waste product iron(II)sulfate is removed. As FeSO4 is not very soluble at low temperatures, the solution is cooled to around 15 °C and FeSO4 crystallises out. It can then be removed by filtration.
The remaining aqueous digestion products are heated to around 110 °C in order to hydrolyse the titanium oxygen sulphate.

TiOSO4 + (n+1)H2O → TiO2•nH2O + H2SO4

The hydrolysis stage of the process produces sulfuric acid waste and a precipitate gel containing hydrated titanium dioxide.

3. In the last stage, the hydrated titanium dioxide is heated in large rotary kilns to drive off the water and produce crystals of anatase or rutile (2 forms of titanium dioxide).

TiO2•nH2O → TiO2 + nH2O

Water is removed at temperatures between 200–300°C. Seed crystals are added to start the crystallisation process. Depending on the final heating temperature (800−850°C or 900−930°C), either anatase or rutile is formed, respectively.
The sulfate process requires the use of very large quantities of sulfuric acid and produces copious amounts of acidic waste. This acidic waste could cause significant damage to the environment, if not disposed of responsibly.

Tinox Chemical Co., Ltd since its' establishment, playing the role as the operation center of TINOX for titanium dioxides products, with years experience in China. We built a highly experienced team of professionals in pigments related industry. Such enbale us provide wide ranges of services to our customer, from shipment booking, background checking, financing, product outsourcing, etc. If you need our services, please do not hesitate to contact us.

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