Research significance of wear-resistant lining plate of mining machinery

The wear-resistant lining plate is the main vulnerable and consumable part in the ball mill in the beneficiation industry. When the wet mill works, the wear-resistant lining plate will bear the impact and grinding stripping of materials and grinding balls in the corrosive mineral loading environment, resulting in various forms of friction loss of the wear-resistant lining plate, such as shear wear, impact wear, fatigue wear, abrasive wear and chemical corrosion, This makes the wear-resistant lining plate of the ball mill an important cost expenditure in the mine ore production industry. At present, mineral concentrators of various materials and minerals are distributed all over the country, and wet ball mill equipment is widely used. Tons of ore processed in the beneficiation industry often consume more than 1kg of metal, with an annual demand of more than 200000 tons of wear-resistant liner and 12000 yuan / ton of wear-resistant liner castings, Preliminary estimation shows that the wet wear-resistant lining board for mining is a product with a market scale of several billion.

The service life of the traditional wear-resistant lining plate made of high strength steel and alloy steel is less than 7 months. The service life of the wear-resistant lining plate purchased by a large domestic concentrator with expensive US dollars is only 9 months. The service life of the wear-resistant lining plate is short. When replacing the wear-resistant lining plate, it causes high labor intensity, long shutdown time and troublesome operation process, so a lot of manpower and Material resources and capital have a direct impact on the production efficiency and economic benefits of enterprises.

ZHY casting signed a cooperation contract with the Key Laboratory of mold of Huazhong University of science and technology and the National Society of lost foam casting, and took the lead in adopting the bimetallic liquid lost foam composite casting method in China to carry out the research and development of carbon steel high complex cast iron bimetallic wear-resistant lining plate suitable for wet ball mill.

It is a new type of wear-resistant composite material with both wet cast iron as the main body and metallographic lining of the ball mill, but it is especially suitable for the development of wet cast iron with high wear-resistant structure and wear-resistant performance. The better the wear resistance of general materials, the higher the hardness and the worse the adaptability of subsequent machining. The wear-resistant lining plate needs high dimensional accuracy to meet the assembly requirements of the inner wall of the silo of the football mill, and needs high surface quality to reduce the friction coefficient. These are difficult to be guaranteed by traditional sand casting, so the lost foam casting process is selected for production.

The wear-resistant lining plate of mining ball mill is prepared based on the bimetallic liquid lost foam composite casting method, which not only has the high strength and high wear resistance of eutectic high chromium cast iron, but also has the high theft and high ductility of eutectoid steel. Its strong initial combination is characterized by the comprehensive properties that are difficult to be achieved by traditional single materials. This study aims to solve the contradiction between hardness and initial property, which can not only reduce the production cost, but also provide theoretical support and practical process guidance for the convenient and reliable mass production of new wear-resistant composites, and has obvious economic benefits.

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