Sulfuric acid process titanium dioxide production clean and speed up

In recent years, China's titanium dioxide industry has developed rapidly and has become the world's largest producer of titanium dioxide. In the development of production at the same time, energy-saving, environmental protection and clean production research results are also very significant, advanced energy-saving and environmental protection of new processes, new technologies in the industry has been popularized and applied, some of the technology for the domestic first and reached the international advanced level, the industry, especially the sulphuric acid process is accelerating towards cleaner production direction.
China's titanium dioxide industry mainly based on sulfuric acid process, its research and plant construction began in 1955, has gone through more than 60 years of development process
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. The substantial development of the whole industry began in 1998, and over the past 20 years, the annual production capacity of the industry has increased from 198,000 tons to 3.2 million tons in 2017, with an average annual growth rate of more than 15%, and the output has increased from 140,000 tons in 1998 to 2.87 million tons in 2017, with an average annual growth rate of more than 16%.
as the main body of China's titanium dioxide industry, the sulfuric acid method titanium dioxide industry in clean production there are natural deficiencies. It is also because of this, in recent years, under the guidance and reverse of the country's various ecological and environmental protection policies, sulfuric acid process has been continuously improved and advanced, in addition to the scale of production, production technology level, equipment level, environmental control level, waste comprehensive utilization level has reached a new height.
In environmental protection and clean production, acid-defying exhaust gas treatment, acid-defying tail slag re-use, titanium liquid low-temperature multi-effect concentration, calcined kiln exhaust residual heat re-use, MVR low-temperature evaporative titanium concentrate, titanium gypsum pressing and other technologies have been widely popularized in the industry. In 2017, Shandong Daun Titanium Co., Ltd. and Submarine River Round Titanium White Co., Ltd. were awarded the title of "Green Demonstration Factory" by the Ministry of Industry and Information Technology.
Zhenning, honorary expert of the National Titanium White Industry Expert Group, pointed out that taking the road of co-production is one of the important ways for the sustainable green development of titanium dioxide production enterprises in China. In the development of the industrial chain, enterprises in accordance with their own conditions and surrounding environmental characteristics, and gradually create conditions to embark on the road of joint production, to achieve quantitative reduction, reuse, resource-based circular development. Sichuan Longyu, Shandong Dongjia, Shandong Jinhai, Shandong Daon, Anhui Anada, Ningbo Xinfu, Guangxi Jinmao, Yunnan Datong, Jinan Yuxing, Submarine River Fangyuan, Jiangxi Tianguang and other backbone enterprises have launched sulfur-titanium, sulfur-phosphorus-titanium, sulfur-ammonium-titanium, sulfur-iron-titanium, sulfur-titanium, sulfur-titanium-gypsum-cement and other characteristics of the green industrial chain.
Tang Zhenning said, for example, Guangdong Huiyun Titanium Co., Ltd. to make full use of the surrounding environmental resources, the realization of sulfur-titanium-iron-calcium co-production, by-product iron sulfate part of the dehydrated production of a water sulphate iron mixed with iron sulfate mixed with sulfuric acid, another part of iron sulfate used to manufacture water purifier polymer iron sulfate. In the use of waste acid, the company has 1/3 of the waste acid directly exported to the steel plant pickle steel, the rest of the use of local stone processing plant corner materials and the production of white gypsum and red gypsum, red gypsum after high-pressure filtering for cement plant use, the remaining part of the waste acid for the production of manganese sulfate. The waste sulphuric acid discharged in the production process of the enterprise is almost dried and squeezed, and the production cost of titanium dioxide is reduced by 1000 to 1500 yuan/ton accordingly.
bisheng pointed out that China's sulfuric acid process now has a higher goal: first, on the basis of the existing further tap potential, and strive to continuously improve progress; Waste water purification treatment and reuse, as well as sludge (i.e., red plaster) resource utilization, the third is to further improve the quality of products, not only in terms of price than international advanced products competitive, but also in terms of quality and performance to catch up.
Domestic sulphuric acid titanium dioxide enterprise product quality is accelerating, such as Longyu Lilian, Shandong Dongjia, Pangang titanium, Ningbo Xinfu, Wuhan Fangyuan, Guangdong Yunfu, Kunming Dongyu, Sino-nuclear titanium white, Jinpu titanium industry, Shandong Jinhai, Jinan Yuxing and other enterprises of coatings, plastics and other special sulfuric acid goldstone-type titanium white powder quality, has reached or close to the international first-line product quality, has been recognized by the international market.
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