The project has reached the international advanced level in similar technologiesThe project has reached the international advanced level in similar technologies
Sinochem News (China Chemical News Jiang Xiaomao) On November 26, it was learned from the Secretariat of Panzhihua Vanadium and Titanium Industry Association that the "hydrochloric acid method titanium dioxide recycling industry chain" independently developed by Panzhihua's local enterprise, Panzhihua Quanrui Industrial Co.
"The technical project was officially started in Panzhihua Vanadium and Titanium Industrial Park recently
According to reports, the project has a total investment of 3 billion yuan, and strives to form a scale of 300,000 tons per year during the "14th Five-Year Plan" period.
The first phase of the project is under construction, with an annual output of 20,000 tons and an investment of 300 million yuan
It is understood that with the implementation and continuous strengthening of national environmental protection regulations, the production of domestic titanium dioxide enterprises has been increasingly restricted and restricted
The inherent disadvantages of the existing sulfuric acid titanium dioxide process have become more and more prominent, and environmental protection problems have emerged one after another, which are gradually restricted and eliminated
However, the chlorination titanium dioxide process encouraged by the country, due to the monopoly of technology and raw materials by foreign giants, and its own environmental protection problems, and the domestic titanium ore resources are difficult to transform into chlorinated raw materials that meet the requirements.
The development of the chlorination process will It has been facing multiple restrictions on technology, environmental protection, and raw materials for a long time
In order to give full play to Panxi's titanium resource advantages and truly realize the sustainable development of the titanium dioxide industry, the company has gathered relevant professional and technical personnel since 2009 to devote themselves to the comprehensive utilization of vanadium-titanium magnetite and hydrochloric acid method titanium in Panxi area.
Research and development of white powder production technology
In April 2017, the research and development of the process and equipment system for the industrialization of hydrochloric acid titanium dioxide was carried out
After twelve years of hard work, we have successfully independently developed a hydrochloric acid process titanium dioxide recycling industry chain production process suitable for industrialized systems
It is reported that the technical results have passed the evaluation of scientific and technological achievements by experts.
The expert group pointed out that through basic research and the construction and operation verification of the heavy-duty pilot line, a new and complete hydrochloric acid method titanium that can be constructed and integrates resource recycling and sustainable development has been formed.
Technical achievements of the white powder recycling industry chain
The experts of the evaluation committee agreed that the project has reached the international advanced level among similar technologies in the titanium dioxide industry
Pu Zhonghua, general manager of Quanrui Company, said that the main technological innovation of the project is the completion of the comprehensive utilization of titanium ore resources and the industrial production cycle of titanium dioxide, and the environmental protection of the sulfuric acid method, chloride method and other titanium dioxide production processes.
The existing "three wastes" problem
The second is to produce high-grade rutile paint-grade titanium dioxide, high-purity titanium dioxide and nano-sized titanium dioxide through the research of raw ore activation, pre-reduction of hydrochloric acid and atmospheric acidolysis, acidolysis for dephosphorization, atmospheric hydrolysis, titanium dioxide calcination and post-treatment.
The quality of rutile titanium dioxide is close to that of the chlorination method
Third, an industrial-grade heavy-duty pilot line for hydrochloric acid titanium dioxide with a production capacity of 7.
5T/month has been formed, and stable continuous production has been realized, which provides the process technology and design basis for the construction of the hydrochloric acid titanium dioxide recycling industry chain
Fourth, through the realization of comprehensive utilization of resources and the complete combination of production processes to form a closed loop, the overall economic benefit is higher than that of the sulfuric acid method and the chlorination method
Pu Zhonghua introduced that the technical advantages of the hydrochloric acid process titanium dioxide recycling industry chain are wide selection of raw materials and low grade requirements.
Blast furnace ash can be used; the production process is short.
Compared with the sulfuric acid method, it reduces sedimentation, vacuum freezing, ferrous separation, hydrolysis seed crystal preparation, trivalent titanium preparation, bleaching, rinsing, salt treatment, calcined seed crystal preparation, etc.
This process: Compared with the internationally recognized hydrochloric acid titanium dioxide production process, it reduces the extraction and extraction agent regeneration process.
Third, the resource utilization rate is high, and the comprehensive utilization of titanium, iron, silicon dioxide, and hydrochloric acid is truly realized
The acid hydrolysis process of this system is combined with the mature hydrochloric acid analysis system, and the original use of hydrogen chloride to absorb heat, and the continuous liquid acid hydrolysis system finally realizes environmental protection, safety, energy saving and high efficiency
100% hydrochloric acid is recycled and reused, and there is no liquid waste discharge in the whole system; the use of acid hydrolysis residues to produce porous silicon-titanium composite materials can purify the titanium solution or wash the solids of the hydrated titanium dioxide, calcination and post-treatment of the titanium entrained in the washing liquid The white powder is filtered and recovered, so that the comprehensive yield of TiO2 reaches 100%
Acid hydrolysis slag can produce ceramic special titanium dioxide or porous silicon-titanium composite materials.
Ferrous chloride is spray roasted with chloride to produce two kinds of iron trioxide powders with purity greater than 99% and 54%.
The whole system is truly Realize green environmental protection, no three wastes are discharged