1 equipment size
In recent years, large-scale grinding equipment is an important symbol of the development of ore grinding equipment. So far, there have been many large self-grinding/semi- self-grinding machines in production around the world.
July 2009, China has independently developed, wholly owned intellectual property rights of CITIC Heavy Industries, the world's largest at the time of the First Φ7.93m × 13.6m overflow-type ball mill successfully manufactured and delivered SINO Australian iron ore project. In 2010, the world's largest and most advanced Φ12.2×10.9m self-grinding machine successfully developed by CITIC Heavy Industry Machinery Co., Ltd. was also delivered to the Australian SINO iron ore project.
The development of large-scale grinding equipment abroad is also rapid. The newly manufactured plow Φ12.8m×7.6m and 28MW semi-autogenous grinding machine from Metso Finland has a daily production capacity of 100,000 tons per unit. It is also the world's largest semi-autogenous grinding machine. Metso Minerals is now able to design and manufacture semi-autogenous grinding machines with a Φ13.41×7.92m (effective grinding length of 7.32m) and a drive power of 31MW (loop motor drive). The world's largest specification of the long-tube semi-auto-grinding machine is Φ9.76×10.37m, driven by a ring motor with a power of 16500kw for Peru. Ring motor is also applied to the ball mill, such as Chilean copper ore Lagnna Seca, production capacity of 110000t / d, using SABC process, a semi-autogenous mill 11.58m × 6.10m, it consists of a ring motor drive 19110kw. Supported by three 7.62m × 12.34m ball mill, each billiard mill is driven by a 13230kw ring motor. The Metso mining machine installed in a copper mine in Chile is a Φ7.93m×12.3m ball mill which is the largest ball mill in foreign countries. The installation power is 13400kw, which is gearless transmission. Metso has designed a ball mill with a diameter of Φ8.25m×13.4m with an installation power of up to 16418kw. By the end of 2013, the world's largest single semi-self-grinding ball mill (1 semi-auto-grinding machine + 2 billiard mill) grinding series processing capacity will reach 126000t / d, the installed power of a single semi-auto-grinding machine 28000kw, The installed capacity of a single billiard mill is 22000 kW.
The largest high-pressure roller mill in foreign countries is manufactured by Krupp Polysius of Germany, with a specification of Φ2400mm×1650mm. Its grinding effect on high-hardness ore is particularly prominent, and energy saving is over 30% year-on-year. Cerro Verde copper and molybdenum has been used in Peru. beneficiation plant applications, the production capacity of 2900t / h. The maximum specification of the high-pressure roller mill produced by Feixi Energy Saving Equipment Factory of Hefei Cement Research and Design Institute of China is Φ2400mm × 1800mm, the installed power is 6300kW, and the maximum processing capacity is up to 2660t/h.
2 Â Â Â Grinding new equipment
    A Rolling Bearing Ball Mill
The theoretical frictional power consumption of the conventional ball mill sliding bearing accounts for about 29% of the installed power, and the theoretical frictional power consumption of the rolling bearing is 1% of the sliding bearing. Therefore, replacing the sliding bearing with a rolling bearing is an important way to save energy in the mill. However, due to various conditions, the application of rolling bearings in large mills is still limited.
B center drive ball mill
Wu Zhiqiang and others introduced a new design of the transmission system of the large ball mill. By adopting the central transmission method, the working efficiency of the transmission system is improved, and the structure is simple, the assembly is convenient and the energy saving is remarkable, and the lubrication of the transmission system is further improved. effect. The center drive ball mill is generally 6% more efficient than the edge drive ball mill. Gao Yuhong introduced the design of the new gearbox star reducer for ball mills. The star wheel reducer can realize multiple speeds of the ball mill, simplifying the ball mill drive mechanism to become the center drive.
C barrel roller mill
As a new type of energy-saving grinding equipment, the barrel roller mill combines the energy-saving effect of the roller press, the compact structure of the vertical mill and the operational reliability of the ball mill. At present, this type of equipment is mainly used in the cement industry. Zhao Xuping introduced the development and research of the barrel roller mill.
3 Â Â Â Â Grinding medium and liner
    The development of grinding machine lining materials is also an important direction, and can also achieve the purpose of energy saving. Shang Huancheng introduced the research and application of the magnetic lining of ball mill. Li Gucheng and others introduced the application of domestically produced high- chromium cast iron liners on very large ball mills. Xu Xingjun and others introduced the development of large-diameter forged wear-resistant steel balls for mining. By high-carbon low-alloy steel components were analyzed, we developed a new process for the production of high-carbon low-alloy steel forging balls. Xu Xingjun introduced the development of high carbon chromium GCr15 high wear resistant grinding balls. Wang Peng introduced a new type of multi-functional grinding medium patent, which has a hemisphere at both ends and a cylinder with a high radius in the middle. When the multi-purpose grinding medium is ground, it is point, line and surface contact, and the efficiency of impact and grinding and stripping is higher than that of the sphere.
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