Introduction

The common processing technology of limestone is to use special grinder to grind it into powder by mechanical technology. The limestone can be directly grinded to obtain heavy calcium carbonate. According to the grinding fineness, the limestone can be divided into four different specifications in industry: single fly, double fly, three fly and four fly, which are respectively used in various industrial sectors. Because the reactivity of limestone is closely related to available magnesium content, hardness, particle size, crystalline morphology and so on, improving the fineness of limestone discharging is an important research direction of the technical development of limestone grinder in the industry, and also an important standard to judge the performance of various limestone grinders. At present, the limestone grinders introduced by various domestic manufacturers are developed from the traditional Raymond mill design process, which is specially suitable for limestone deep processing production. This series of grinders adopt more mature grinding process design, and can be well applied to limestone processing and production. The basic working principle of this kind of mill is that the crusher crushes the bulk raw materials to the required feed size, then the material is conveyed to the storage bin by the bucket elevator, and then is evenly conveyed to the grinding chamber of the main engine by the electromagnetic vibration feeder, and the material is shoveled and thrown into the grinding roller ring in the same rotating process between the shovel and the grinding roller. The padding layer is formed, and the material is grind between the grinding roller and the grinding ring so as to achieve the purpose of making flour. The powder after grinding is carried to the analyzer by the air flow of the blower. The fine powder which meets the fineness requirement enters the large cyclone collector through the air flow pipeline for separation and collection, and then discharges into the finished powder through the discharger. The air flow is sucked into the blower by the upper return duct of the large cyclone collector. Unqualified powder is thrown out of the blade wall and separated from the air flow. Coarse powder falls into the grinding chamber for re-grinding due to self-gravity. The whole airflow system is closed and circulated under positive and negative pressure.
Limestone is a valuable resource that is widely used. Limestone is the commodity name of limestone as mineral material. Limestone has been widely used in the history of human civilization because of its wide distribution and easy access in nature. As an important building material, limestone has a long history of exploitation. In modern industry, limestone is the main raw material for making cement, lime and calcium carbide. It is an indispensable flux limestone in metallurgical industry. After ultra-fine grinding, high-quality limestone is widely used in papermaking, rubber, paint, paint, medicine, cosmetics and so on. Feed, sealing, bonding, polishing and other products in the manufacture. According to incomplete statistics, the total ratio of limestone consumed in cement production to building stone, lime production, metallurgical flux, and ultra-fine calcium carbonate consuming limestone is 1:3. Limestone is a non-renewable resource. With the continuous progress of science and technology and the development of nanotechnology, the application of limestone will be further expanded.