Changsha Institute of Mining and Metallurgy has made a major breakthrough in the "wet zinc smelting high concentration zinc concentrate fine grinding equipment technology"

The “Zinc Oxygen Pressure Leaching Vertical Mixing Mill and the Development and Application of Two-stage Open-circuit Grinding System” jointly completed by Changsha Mining and Metallurgical Plant and Western Mining and Zinc Branch were evaluated as international leading level!

September 7, China Nonferrous Metal Industry Association, organized in Changsha, the project will evaluate the scientific and technological achievements.

The meeting was chaired by Director Zhong Qiong of the China Nonferrous Metals Industry Association. The expert group consists of the leader of the Chinese Academy of Engineering, Dr. Sun Chuanqi, the deputy head of the Institute of Metallurgy and Environment of Central South University, Professor Zhao Zhongwei, and the deputy general manager of China Metallurgical Changtian International Engineering Co., Ltd., Mr. Ye Hengyi, professor-level senior engineer, Guangxi Southwest Nonferrous Metals Group Co., Ltd. The company's deputy general manager Tang Mingcheng is a professor-level senior engineer, and Changsha Nonferrous Metals Design and Research Institute Co., Ltd. is a master of design, Professor Dai Xueyu.

At the meeting, Professor Zhang Guowang, director of the equipment and project leader of our institute, introduced the project. The expert team carefully reviewed the identification materials, listened to the project team report, and watched the video of the operation of the equipment technology in the field of 100,000 tons of electric zinc and oxygen pressure in the western mining industry, and questioned and answered the situation of the project.

The participating experts fully affirmed the innovation and advancement of the project, and agreed that: for the oxygen-pressure leaching full-wet zinc smelting process, the zinc-oxygen pressure leaching vertical stirring mill under the conditions of grinding concentration of 65%-68% The total installed power of 1400kW) and the two-stage open-circuit grinding system can stably produce a particle size of -45μm of 95% or more. Compared with domestic and foreign technologies, the process and equipment technology not only has short process, low investment, low operating cost and energy saving effect. Significantly, it has made a major breakthrough in the preparation process and equipment of zinc concentrate oxygen leaching raw materials, and innovatively solved the technical problem of high concentration fine grinding of zinc concentrate. In the same type of wet smelting plant has a good prospect of popularization and application, zinc concentrate oxygen pressure leaching vertical mixing mill and two-stage open-circuit grinding system has an international leading level.

【Background of the project】

Zinc-oxygen leaching wet smelting technology is an internationally advanced zinc smelter direct oxygen leaching wet smelting technology. Compared with other zinc smelting processes, it reduces the concentrate drying, leaching slag drying and desulfurization process. Low process, short process, low power consumption, low environmental pollution and high leaching rate. However, in the direct oxygen pressure leaching process of zinc concentrate, it is required that the grinding grain size of the zinc concentrate must satisfy -45 μm and more than 95%, and the concentration must be 65% to 68%, which is technically difficult.

At present, the preparation of raw materials in the zinc-oxygen leaching process at home and abroad is carried out by ball mill + classifier + concentration process or sand mill open-circuit grinding process. The ball mill process has the disadvantages of unstable particle size, high energy consumption, long process, many control points, large floor space, high investment cost, difficult management, unstable underflow of thick machine and high operating cost of the system. The imported sand mill process equipment is expensive, the motor has large installed power, high operating cost, small cylinder volume, and the product granularity only reaches D85=45μm, which affects the subsequent leaching operation index.

【Project Application】

The process and equipment have been put into production in the western mining 100kt/a electric zinc-oxygen pressure leaching system in August 2015. It has been two years since the production index is stable and the equipment is mature and reliable. The successful development of the special vertical stirring mill for zinc concentrate oxygen leaching provides technical guarantee for the fine grinding of zinc concentrate oxygen leaching raw materials, which not only promotes the technological progress of the zinc smelting industry, but also has great potential for promotion, and It is important to promote technological advancement in the industry and enhance market competitiveness.

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