[Ten years of major development in chemical equipment] 1931-2024 my country has achieved a major breakthrough in chlorine leaching and decomposition of vanadium titanium magnetite and iron smelting slag to produce titanium dioxide.

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This post was last edited by Yuyu in the Desert on 2024-7-18 14:03 Safety first. Put prevention first, give thumbs up to China’s chemical technology and equipment achievements * * * * * * * * * * * * * * * * * * * * * * [Ten years of development of chemical equipment] Continue to update summary posts, welcome to participate in the discussion https://bbs.hcbbs.com/thread-3576046-1-1.html (Source: Haichuan Chemical Forum Network) * * * * * * * * * * * * * * * * * On July 16, 2024, good news came from Panzhihua Antai Technology Co., Ltd., which was jointly developed by the company and the School of Chemical Engineering of Sichuan University (referred to as: An industry-university-research cooperation project jointly completed by the School of Chemical Engineering of Sichuan University, the company has worked hard for many years on the production process of nano-titanium dioxide and rutile titanium dioxide prepared by chlorine leaching, and has now achieved relevant important results. It has successively applied for 8 invention patents, including a method for decomposing vanadium-titanium magnetite iron-smelting slag with hydrochloric acid to prepare primary titanium dioxide for pigments. The pilot test results of the project benchmarked the quality of Japan's Ishihara titanium dioxide, and various indicators such as the preliminary rutile titanium dioxide prepared by the hydrochloric acid system of iron-making slag were stable and normal, and can be optimized and improved in the future. It shows that Anti Technology has taken a unique approach and created a new green titanium dioxide process technology. It uses chlorine leaching to decompose vanadium-titanium magnetite iron-making slag (blast furnace slag) to prepare qualified rutile titanium dioxide products. According to Wu Zhifu, chairman of Anti Technology, Anti Technology is a company mainly engaged in the research and development of chemical equipment, control system development and application. In 2020, the company began to cooperate with the School of Chemical Engineering of Sichuan University to develop "chlorine leaching decomposition of vanadium titanium magnetite iron smelting slag" (Blast furnace slag) "preparation of rutile titanium dioxide" related research, after repeated pilot tests by scientific and technical personnel, in July this year, a major breakthrough was achieved in the pilot line. Both TCS and SCX exceeded the index requirements of Ishihara titanium dioxide, and other indicators were also better than Japan's Ishihara titanium dioxide finished products. Wu Zhifu said that the method and steps for preparing primary titanium dioxide for pigments by leaching and decomposing vanadium-titanium magnetite iron-making slag (blast furnace slag) are: the first step is to crush the vanadium-titanium magnetite iron-making slag (blast furnace slag) through crushing + roller mill coarse grinding, vertical mill grinding, mechanical + microwave activation ； The second step is a full-process atmospheric pressure system. First, 360g/L hydrochloric acid + hydrogen chloride gas is used to leach the crushed and activated vanadium-titanium magnetite iron-making slag to achieve chlorine leaching of impurity elements such as titanium, calcium, magnesium, manganese, aluminum, iron, and vanadium. , during this process, unleached titanium dioxide and silica are directly prepared into porous silicon-titanium composite materials, and the leaching rate of titanium dioxide is >75%, the leaching rate of calcium, magnesium, and manganese is >85%, and the leaching rate of iron, aluminum, and vanadium is >99% ； In the third step, after flocculation using a special flocculant, there is no need for sedimentation, and solid-liquid separation is performed directly to obtain silicon-titanium composite materials and acidolytic solution. ； The fourth step is to quantitatively add sulfuric acid to the acidolysis solution to precipitate calcium. After solid-liquid separation, white gypsum dihydrate (CaSO₄·2H₂O) and clear titanium liquid after calcium precipitation are obtained. ； The fifth step is to evaporate and concentrate the clear titanium liquid, recover high-concentration condensed acid, and prepare a concentrated titanium liquid that meets the hydrolysis conditions. According to reports, Anti Technology conducted 2 years of hydrolysis experimental research on concentrated titanium liquids and achieved key breakthroughs. The core technology of this process is to prepare hydrated titanium dioxide by thermal hydrolysis of concentrated titanium liquid through heterogeneous nucleation of concentrated titanium liquid under conditions of high aluminum and high manganese content while ensuring the total ion concentration. ； After solid-liquid separation of hydrated titanium dioxide, washing and pressing, without salt treatment, the primary product of rutile titanium dioxide can be obtained by direct calcination. ； Then through multi-effect concentration and hydrolysis of the mother liquor, dilute hydrochloric acid of different concentrations is prepared. ； After concentration, the mother liquor is first extracted (or resin exchanged) to extract vanadium. ； After vanadium extraction, the mother liquor is combined with the different properties of magnesium, aluminum, iron, and manganese hydroxides for sedimentation filtration. Individual elements are dissolved and then spray-roasted to prepare oxides, or flash drying is performed to prepare oxides. During the process, each part of the tail gas system can be used to produce concentrated hydrochloric acid. ； The final liquid is sodium chloride solution, using a mature system to prepare industrial salt. Wu Zhifu said that through the decomposition of vanadium titanium magnetite iron-making slag (blast furnace slag) through chlorine leaching, the comprehensive utilization of bulk solid waste vanadium titanium magnetite iron-making slag (blast furnace slag) is achieved. >75% of the titanium component in the vanadium titanium magnetite iron-making slag is extracted to prepare the primary product of rutile titanium dioxide, and the finished product of rutile titanium dioxide can be prepared through the post-processing process. The resource utilization rate of valuable components such as calcium, magnesium, silicon, aluminum, manganese, iron, and vanadium is high, and there is no liquid waste or solid waste discharge in the whole process. This project research is not only consistent with * * industrial policy, in line with * * In line with environmental protection policy requirements, it is a green and advanced new process technology for the preparation of titanium dioxide.