The biggest drawback of traditional sulfuric acid titanium dioxide technology is that the “three wastes†have large emissions and high processing costs. Since the "Twelfth Five-Year Plan", the domestic titanium dioxide industry has achieved a number of breakthroughs in the "three wastes" treatment and comprehensive utilization, there have been a variety of joint production methods of clean production. During the “Thirteenth Five-Year Plan†period, sulfuric acid process titanium dioxide shall be fully constructed through the establishment of sulfur-titanium, sulphur-phosphorus-titanium, sulphur-iron-titanium, sulphur-ammonium-titanium, titanium-sulfur-iron and other circular economy industrial chains. produce. In view of the characteristics of titanium resources in China, the status quo of the titanium dioxide industry and the difficulty of developing the introduction of chlorinated titanium dioxide technology, the production of titanium dioxide will be dominated by the sulfuric acid process in the near future. How to effectively use the by-products generated by the sulfuric acid method, guide and regulate the way companies take the recycling economy, and the state and industry organizations are making active efforts. At present, sulfuric acid titanium dioxide enterprises in China have changed from sulfuric acid astragalitic titanium dioxide to rutile titanium dioxide. Rutile titanium dioxide production capacity has exceeded 70%, and this proportion is still rising. Low-grade, differentiated, fine-tuned high-end grades and the substitution of imported high-end titanium dioxide forward. In terms of commercialization of waste by-products, sulfuric acid titanium dioxide is the most pressure-sensitive company to use sludge (red gypsum) produced after the neutralization of waste acid. Based on the surrounding environment, Guangdong Huiyun Titanium Industry Co., Ltd. has purposefully created the industry's first wasteful, deputy and fully commercialized clean production and recycling economy industrial chain, which not only achieves internal recycling and zero emission of waste by-products, but also achieves considerable economic benefits. And social benefits. During the “Thirteenth Five-Year Plan†period, the titanium dioxide industry should make a fuss around the clean production of sulfuric acid, vigorously implement the development strategy of the circular economy, use resources to dry up, reduce consumption, and take the path of environmentally friendly development, especially to do a good job Three aspects of work: Vigorously promote energy conservation and consumption reduction. Continuously improve the level of titanium dioxide production facilities, promote advanced water-saving equipment and appliances, strengthen the consumption management of titanium dioxide raw materials, promote product eco-design and the use of renewable materials; at the same time, enterprises producing anatase and rutile titanium dioxide may wish Changing the general sharp state is still greater than the rutile product structure and reducing the waste of hidden titanium sulfur resources. Strengthen the comprehensive utilization of resources and maximize the use of various wastes produced in production and consumption. Improve the recovery rate of titanium concentrate resources and comprehensive recovery rate, process selection of a single variety of ore, based on the experiment, strengthen the acid hydrolysis process and settlement, increase the utilization rate of titanium in the mine; Scientific use of waste acid concentration and other supporting devices To promote the comprehensive utilization of waste slag, waste water, waste acid, and exhaust gas in titanium dioxide production processes with large waste generation and heavy pollution. Fully promote clean production, reduce the generation and emission of pollutants from the source of production and services. Through the implementation of clean production technology transformation, the company will increase the technological level of titanium dioxide production, and at the same time use the high quality titanium slag as much as possible for production, and realize the change from end-of-pipekeeping to pollution prevention. The comprehensive treatment of acidic wastewater is an important measure for the sulfuric acid titanium dioxide enterprises to fully implement the new environmental protection law and the national “Water Ten†policy. At present, the wastewater used in the lime-acid-neutralization process in the whole industry can meet the discharge standards, but produce a large amount of gypsum. The comprehensive treatment of acidic wastewater is expected to change this situation. It is reported that the first domestic comprehensive wastewater treatment project for acidic wastewater has been implemented and can be completed and put into operation in 2016. After comprehensive treatment of acidic wastewater, waste water, waste acid, ferrous sulfate and other resources can be recycled to the maximum extent, so that the sulfuric acid process titanium dioxide production truly zero emissions and non-discharge; to achieve metal ion separation, dilute acid concentration, water recovery The rate of reduction of acidic wastewater and titanium gypsum was over 94%. With the completion of the project, it is foreseeable that the comprehensive treatment of acidic wastewater during the “Thirteenth Five-Year Plan†period will be fully applied in the national sulfuric acid titanium dioxide enterprise. In the upcoming “13th Five-Year Planâ€, it is hoped that the state will vigorously support the sulfuric acid enterprises that have achieved clean production and recycling economy from the policy orientation and funding level, so that they will have a more relaxed development environment and promote the Chinese characteristics of the sulfuric acid method. The healthy development of the titanium dioxide industry.
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Sulfuric acid titanium dioxide: building a cyclic chain