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Column mill overview
The column mill is a new type of rolling crushing equipment. It was successfully manufactured in Changsha Shenxiang General Machinery Co., Ltd. (hereinafter referred to as Changsha Shenxiang) in the mid-1990s and is widely used in various industries at home and abroad. The machine features a collection of vertical mill (roller grinding mill), and centrifugal roll mill and other equipment, both for grinding, crushing and as a super fine particles (iron ore), pre-grinding (cement and building materials), especially for For the production of any particle size range between 0 ~ 5mm. The column mill is a coarse grinding equipment with better comprehensive performance, which fills the blank of equipment that was difficult to produce any grade of 0.1~5mm in the crushing industry. It has the following remarkable features: 1 high power saving range, can save 30%~50%; 2 can be used for ultra-fine crushing or pre-grinding to increase the yield of ball mill by 50%~100%; 3 economical and high efficiency Production of 0~5mm in any particle size range; 4 long life of wearing parts; 5 high reliability; 6 can be used in various industries to crush various materials, can be used for ultra-fine crushing (or pre-grinding), It can also be used for final grinding to produce fine powder.
Scope and application
One post mill is widely applicable characteristics, especially for ultra-fine iron ore (0 ~ 5mm), cement, slag powder and ultrafine pregrinding the steel slag, gypsum and other non-metallic ore final grinding And pulverization of various fine or coarse particles between 0 and 5 mm. The machine can be used for fine crushing of hard, soft, high moisture, viscous and flammable and explosive materials. It can be widely used in iron ore and other metal ore and non-metal ore. cement, building materials, steel, refractory materials, chemical industry, pulverized ore, pyrite, copper mines, cement raw meal or clinker, gypsum, limestone, dolomite, feldspar, serpentine, coal waste rock, slag , steel slag, etc. And get products with different particle size requirements.
Column mills have been used in many iron ore mines, mainly for ultra-fine crushing, crushing tens of millimeters of iron ore to -3mm, and the equipment is stable and reliable. The use of the manufacturers have obtained good economic benefits, especially in the case of -3mm, a large amount of tailings can be removed by coarse grains (30%~50% of the coarse-grained tailings are removed), so that the ball mill and subsequent beneficiation processing capacity can be improved. 60%~100%, in addition to significantly improve the concentrate grade and recovery rate of iron ore.
Column mill working principle and structure
The column mill is a vertical mill that uses the principle of high-speed, medium-pressure and continuous repeated bed grinding. See Figure 1 for its working principle and structure.
The reducer on the upper part of the column mill is connected to the spindle of the mill. The lower part of the main shaft is provided with a rotatable cone, and a plurality of grinding rolls are arranged around the cone. There is an annular tapered lining under the grinding roller. The reducer of the column mill is located at the uppermost part of the machine; the reducer is connected with a base, and the rotating base is mounted in the base; the lower part of the base is connected to a cylinder The lower part of the cylinder is installed on the foundation, and the inspection door is opened in the middle of the cylinder, and the cone and the partial grinding roller are in the cylinder; the lower part of the cylinder is connected to a cone by a set of elastic mechanisms. The two cylinders are movable up and down; the annular tapered inner liner is installed in the cone; the grinding roller is above the inner liner and has an adjustable gap therebetween; The lowermost part of the cylinder is also provided with a discharge sleeve which can be lifted up and down to adjust the thickness of the material layer on the inner liner. A feed port is opened on the base and a hopper is installed, and a rotatable spreading disc is arranged on the main shaft of the upper part of the cylinder. When working, the motor drives the reducer on the upper part of the machine, and the reducer drives the main shaft. The main shaft drives the sprinkling disc and the cone to rotate. The cone drives the grinding roller to revolve around the center line of the main shaft. The material to be pulverized is fed from the hopper on the machine base, and the material flows from the hopper to the rotating spreading disc by its own weight and is evenly spread to the uppermost part of the annular cone lining, where the material forms a layer and Under the effect of self-weight, it continues to slide down. During the sliding process, it is repeatedly crushed by medium pressure of the grinding roller which is used for both high-speed revolution and rotation. The pressure of the grinding roller comes from the elastic device between the cylinder and the cone cylinder, and is crushed. The broken material is discharged from the lowermost discharge casing to become a product. Since the grinding roller is not in contact with the lining and has a regular pure rolling motion, the wearing parts are rarely worn. When the grinding roller and the lining are worn, the axial gap between the cone and the cylinder is adjusted outside the apparatus. Just fine. Adjusting the discharge sleeve up and down can control the residence time of the material in the working chamber and the thickness of the material layer, thereby controlling the fineness of the material. The adjustment of the fineness of the material can also be achieved by changing the pressure of the elastic device, the rotation speed of the main shaft, the gap between the grinding roller and the inner liner, etc., so that the granularity of the product can be conveniently adjusted, or the granularity can be adjusted. A specified interval, or how much fine powder is controlled in the product. When the non-decomposable material such as iron is entered into the working chamber of the column mill, the deformation of the elastic device can automatically increase the gap between the grinding roller and the inner lining, and the iron can be discharged by itself, and the machine automatically resumes operation, thereby protecting the machine. .
Column mill specifications and technical parameters
The column mill is suitable for ultra-fine particle crushing (or pre-grinding) of various hardness and various materials. It can be used for final grinding with the classification equipment . The technical parameters in Table 1 are limestone as the calibration material, and the production process is ultrafine particle crushing.
Column mill crushing process
Column mills are mainly used for ultrafine particle crushing (or pre-grinding, coarse grinding) or for grinding (or final grinding).
(1) Ultrafine particle breakage. Two comminution processes can be employed.
1) Open circuit ultrafine particle crushing process. The open circuit ultrafine particle crushing process is (Fig. 2) the crushed ore (particle size is n+mm)→column mill→superfine product (80%~5mm).
2) Closed circuit ultrafine particle crushing process. Broken ore (particle size n+mm)→column mill→sieving machine→superfine product (100%~3mm)→coarse grain (Fig. 3).
In the iron ore and metal mine, the column mill is used in the ultrafine particle crushing process, which can reduce the ore particle size to 3-5mm. This ore particle size is especially suitable for coarse grain tailing, which can remove a large amount of tailings before ball milling. It can increase the ball mill and beneficiation production capacity by 50%~100%, and can also significantly improve the beneficiation index. Table 2 is a sample of fineness and fineness of the column mill used for crushing ultrafine particles of limestone. When the column mill is used for ultrafine particle crushing of iron ore, its particle size distribution is similar to the above data.
(2) Grinding (or final grinding) process. This grinding process (Fig. 4) can be used for dry grinding of non-metallic ore materials, which is characterized by a 30% reduction in energy consumption compared to dry ball mill grinding and a product size of up to 400 mesh.
Column mill pulverizes the standard production capacity of various materials
The production capacity of the column mill varies with the production process and the material to be pulverized. The production capacity in Tables 3 and 4 can be used as reference for design.
   figure 1  Figure 2, 3  Figure 4    Table 1  Table 2  Tables 3 and 4