On April 23, 2002, Altair Nanomaterials Inc. applied for a patent for invention. The process is neither a sulfuric acid production process, are not chlorinated production process, it should be said that the production of hydrochloric acid method process, the process as shown below: titanium iron ore leaching takes hydrochloride, separating the insoluble residue. The leaching solution is subjected to high-valent iron reduction to low-cost iron, cooling and crystallization of ferrous chloride, and separation of ferrous chloride; and the titanium-containing leaching solution after separating ferrous chloride is subjected to the first solvent extraction, and the extraction phase is contained Titanium and high-iron solution, the raffinate phase is a ferrous-containing aqueous solution, the return process is used to regenerate hydrochloric acid, and the process is returned to the leaching process; the titanium-containing extract phase is subjected to a second extraction, and the extracted phase is a titanium-containing aqueous solution, and the raffinate phase For the aqueous solution containing high iron, the hydrochloric acid regeneration step is returned; the titanium chloride solution after extraction and purification is subjected to hydrolysis, and the best hydrolysis method is spray heating hydrolysis to obtain metatitanic acid, and the hydrochloric acid and water in the gas phase are returned to the hydrochloric acid regeneration system. The hydrolyzed metatitanic acid is subjected to calcination, wet milling, inorganic coating, filtration washing, drying, steam powdering and packaging. The process can produce nano titanium dioxide, anatase and rutile titanium dioxide. The ferrous chloride separated by cooling and crystallization is pyrolyzed to obtain an iron oxide solid, and the gas is a leaching step in which hydrogen chloride and water vapor are returned. It is characterized in that hydrochloric acid is recycled, and by-products only produce iron oxide slag.
The company is a NASDAQ-listed company in the United States. In 1999, it purchased new process technology and experimental equipment from BHP, which is based in Australia. In order to strengthen the development of new processes, 15 scientists who participated in the research were hired to Otto in 2001. The research on the production process of new titanium dioxide was continued. In 2002, the first patent was approved in the United States. 1910 is the age of the Clarence Sulfuric Acid Law, 1950 is the era of DuPont Chlorination, and the 21st century is the age of the Otell Hydrochloric Acid Law.
The company said that the advantages of the new process for the production of titanium dioxide are: the use of low-cost titanium raw materials; low energy consumption; can produce sharp state as needed, can also produce rutile products and nano-scale titanium dioxide; less waste generation, no deep wells Landfill; lower cost than sulfuric acid and chlorination; and investment costs are comparable.
The production process only completed the pilot test of 5t per day, and its industrial scale production equipment had to wait for good news.
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