In recent years, China's titanium dioxide industry has developed rapidly, and it has become the world's largest producer of titanium dioxide in production. While developing production, the research results of energy conservation, environmental protection and clean production are also very significant. A large number of effects are obvious, advanced and applicable. New technologies for energy conservation and environmental protection, new technologies have been promoted and applied in the industry, some technologies have reached the domestic first, international advanced level, the whole industry, especially the sulfuric acid process is accelerating towards clean production. This is from September 9 to 10 Information on the 2018 titanium dioxide clean production equipment held in Tiantai, Zhejiang.
China's titanium dioxide industry is mainly based on the sulfuric acid process. Its research and construction started in 1955. It has gone through more than 60 years of development. The substantial development of the whole industry began in 1998. In 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 over 15%. The output has also increased from 140,000 tons in 1998 to 2.87 million tons in 2017, with an average annual growth rate. More than 16%.
With the increase of production capacity, the status of China's titanium dioxide industry in the world has also been continuously improved. In 2009, China's total capacity of titanium dioxide reached 1.8 million tons, surpassing the United States to rank first in the world, and has been the world's first titanium dioxide since then. The location of the big country of production.
Bi Sheng, director of the Titanium and White Branch Center of the National Chemical Productivity Promotion Center, Bi Sheng, secretary-general of the Titanium Dioxide Industry Technology Innovation Strategy Alliance, pointed out that it is not the ultimate goal of China's titanium dioxide industry for many years in the world. As the main body of China's titanium dioxide industry, sulfuric acid method The titanium dioxide industry has natural shortcomings in clean production. For this reason, in recent years, under the guidance and pressure of the national ecological environmental protection policies, the sulfuric acid process has been continuously improved and improved, in addition to the production scale, the production technology level, equipment 2. Equipment level, environmental control level, and waste utilization level have reached new heights.
Bi Sheng pointed out that in terms of product quality, the products of large and medium-sized enterprises in the industry have certain market popularity. Some brands can be applied in the middle and high-end fields, and some are used with imported products, which can be applied to the top field. The sulfuric acid product basically covers the downstream application market, which is not available in chlorination products.
In environmental protection and clean production, acid hydrolysis tail gas treatment, acid hydrolysis tailings reuse, titanium liquid low temperature multi-effect concentration, calcination rotary kiln exhaust gas waste heat reuse, MVR low temperature evaporation concentrated titanium liquid, titanium gypsum pressing and other technologies are obtained in the industry Large-scale promotion and popularization. In 2017, Shandong Daon Titanium Industry Co., Ltd., Qianjiang Fangyuan Titanium White Co., Ltd. was awarded the title of 'Green Demonstration Factory' by the Ministry of Industry and Information Technology.
Tang Zhenning, an honorary expert of the national titanium dioxide industry expert group, pointed out that taking the joint production road is one of the important ways for the sustainable green development of China's sulfuric acid process titanium dioxide production enterprises. In terms of industrial chain development, each enterprise is gradually based on its own conditions and surrounding environmental characteristics. Create conditions to embark on the road of joint production, realize reduction, reuse, and resource development. Sichuan Longjing, Shandong Dongjia, Shandong Jinhai, Shandong Daon, Anhui Ananda, Ningbo Xinfu, Guangxi Jinmao, Yunnan Great interoperability, Jinan Yuxing, Qianjiang Fangyuan, Jiangxi Tianguang and other key enterprises have successively launched sulfur-titanium, sulfur-phosphorus-titanium, sulfur-ammonium-titanium, sulfur-iron-titanium, sulfur-titanium-gypsum-cement, etc. Different green industry chains.
Tang Zhenning told reporters that, for example, Guangdong Huiyun Titanium Co., Ltd. made full use of the surrounding environmental resources to achieve sulfur-titanium-iron-calcium co-production, and a part of the by-product ferrous sulfate was dehydrated to produce ferrous sulfate monohydrate and pyrite. The mixed sulfuric acid is mixed together, and another part of the ferrous sulfate is used to manufacture the water purifying agent to polymerize ferric sulfate. In terms of waste acid utilization, one third of the company's waste acid is directly exported to the steel plant for pickling steel, and the rest utilizes local stone. The processing plant's scraps are neutralized to produce white gypsum and red gypsum. The red gypsum is then used by high pressure filter for cement plant. The remaining part of waste acid is used to produce manganese sulfate. The waste sulfuric acid discharged from the production process is almost dried. Net, titanium dioxide production costs are also reduced by 1000~1500 yuan / ton.
Bi Sheng pointed out that China's sulfuric acid process now has a higher goal: First, further tap the potential on the existing basis, and strive to continuously improve the progress; Second, efforts to waste resources, low emissions or zero emissions, mainly Refers to the low-concentration waste acid, the purification and reuse of wastewater, and the resource utilization of sludge (ie, red gypsum); the third is to further improve the quality of products, not only to be competitive in price than international advanced products, To fully catch up with quality and performance.
The good news is that the quality of domestic sulfuric acid titanium dioxide enterprises is accelerating, such as Longyi Lilian, Shandong Dongjia, Pangang Vanadium and Titanium, Ningbo Xingfu, Wuhan Fangyuan, Guangdong Yunfu, Kunming Dongpu, and medium nuclear titanium white. , Jinpu Titanium Industry, Shandong Jinhai, Jinan Yuxing and other enterprises of coatings, plastics and other special sulfuric acid method rutile titanium dioxide quality, has reached or close to the international first-line product quality, recognized by the high-end market.