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The processing of ground calcium carbonate is simply the process of using crushing and grinding equipment to process calcium carbonate minerals into various powders that can meet the requirements of industrial applications. Because different industrial applications have different requirements on the particle size, shape, whiteness and particle size distribution of ground calcium carbonate powder, the processing technology of ground calcium carbonate should also comprehensively consider the process route and equipment selection according to the product positioning. Generally speaking, the design of grinding equipment is based on different principles: impact, extrusion, friction, shear and combination of various forces, etc. Different designs will have different grinding effects and product fineness.
The common processing equipment of ground calcium carbonate produced by large-scale dry process includes Raymond mill, Vertical mill, Ring roller mill and Ball mill. Due to the different crushing principle and discharging method of the equipment, the processed powder has great differences in grain type, particle size distribution and unit energy consumption, so the positioning of the product also has obvious differences.
The ball mill can cooperate with the air classifier to form a closed-circuit circulation system, after the grading of the coarse powder can be returned to the ball mill for re-grinding, and the Raymond mill, vertical mill, vibration mill due to the capacity of the mill is very limited, return difficult, unable to form a closed-circuit circulation system, to return to the treatment of problems.
The ball mill is also a low speed operating equipment, impact and friction energy consumption to minimize. Therefore, it is not only an ideal choice for grinding high hardness, abrasive mineral raw materials, but also the most economical choice for grinding white filler minerals such as low hardness calcium carbonate.
It can be seen from the particle size distribution map that the particle size distribution of the grinding products of the ball mill is the widest. Through the air classifier, the products with different fineness requirements can be separated. At the same time, the output of the ball mill is large, with scale effect, so it has a strong market adaptability and competitiveness.
The production line adopts the international popular continuous production process: ball mill and air classifier system. The technological process mainly includes crushing (generally using two-stage crushing), grinding, classifying, packaging, magnetic separation, transportation, lifting, etc. After the ball mill can be parallel or series multiple classifier at the same time to produce more than one size of the product.
Working principle: The raw material is fed into the hollow cylinder through the hollow shaft neck for grinding. The cylinder is equipped with grinding media of various diameters (steel ball, steel bar or gravel, etc.). When the cylinder rotates around the horizontal axis at a certain speed, the medium and raw materials in the cylinder under the action of centrifugal force and friction force, as the cylinder reaches a certain height, when its own gravity is greater than the centrifugal force, it will escape from the cylinder body wall and drop or roll down, smashing the ore due to the impact force. At the same time, the sliding motion of the grinding medium also produces grinding effect on the raw material during the rotation of the mill. The ground material is discharged through a hollow journal.
Raymond mill is the earliest and most widely used grinding equipment in China, with low fineness, suitable for the production of 400 mesh of coarse ordinary powder. A small amount of 500 ~ 1250 mesh products can be obtained through secondary classification. Suitable for large scale production of coarse powder and small scale production of fine powder.
Working principle: Raymond mill rollers works under the action of centrifugal force tightly on the ring rolling, the shovel knife scooping up material to the grinding roller and grinding ring in the middle, the material under the action of ground pressure, broken into powder, and then under the action of fan blow into powder material up through analysis of machine, to fulfill the requirements of fineness of materials through the analysis of machine, cant meet the requirements of the return to continue to grinding, grinding chamber through the analysis of the material into the cyclone separation of machine to collect. Use industrial press cloth to separate the air exhaust into powder.
Vertical mill is a typical material layer extrusion crushing equipment, the most fine can reach 1250 mesh, through the second, third classification of the most fine can reach to 3000 mesh, generally suitable for mohs hardness of less than 7 materials.
Working principle: The motor through reducer driven in mill, material from the feed opening fell into a grinding disc, move to the edge of mill under the action of centrifugal force and grinding roller of roller compaction, shredded material from mill edge overflow, at the same time from the nozzle ring (ring) wind speed up stream to efficient separator, which is one with vertical mill meal after separator is returned to the mill wheel, grinding again; The fine powder is ground with the air flow and collected in the dust collecting device of the system, which is the product. Coarse granular materials not taken up by the hot gas flow and accidental entry of metal parts sink from the wind ring, after scraping out by the scraper, through the external circulation of the bucket machine feeding into the grinding again grinding.
As the roller is small and many, the fit clearance with the grinding ring is also small, the most fine grinding can be up to 2500 mesh. Low energy consumption and low fine powder content. Generally suitable for mohs hardness below 5, narrow particle size (low oil absorption value), moderate fineness of materials. But forhard materials, if they are light color (white), the degree of dialogue has a great influence.
Working principle: It adopts the principle of impact, extrusion and grinding to crush the material. There is a large active gap between the grinding ring and pin shaft installed on the grinding ring bracket. When the grinding ring bracket rotates with the spindle, the grinding ring is swung to the grinding ring by centrifugal force, and the inner wall of the grinding ring is pressed and rotates around the pin axis. When the material passes through the gap between the grinding ring and the grinding ring, it is impacted, squeezed and ground by the grinding ring. Under the action of gravity, the crushed material falls into the swing plate and is then thrown into the air flow into the grading chamber for classification. The qualified fine powder is collected through the grading wheel into the rear passage collection system, and the coarse material is thrown into the shunt ring for internal avoidance, and then falls back into the crushing chamber for crushing. The grinding ring is single layer or upper and lower double layer distribution. When the double-layer grinding ring crusher works, the material is crushed again when passing through the gap between the second grinding ring and the grinding ring.
Calcium Carbonate (GCC) produced from chalk, limestone, calcite or marble have developed in recent years from just being a simple cheap filler to highest quality functional additives. GCC is used as dry powder or slurry in many industrial applications for plastic, paint, rubber, sealants or paper. Furthermore, a strong trend and shift to significantly finer grades is clearly observed in the range of finer than d97 < 10 m to d97 < 1.6 m. Special designed very steep particle size distributions as an functional additive for the production of breathable film in the hygiene field (for example baby diapers) or building material represent a further demanding challenge. GCC as an additive in almost all polymers must be subjected to a surface treatment, known as coating by means of technical stearic acid. In recent years the demand for highest coating GCC quality increased significantly. Highest hydrophobicity, few ppm residues in the upper size area of the particle size distribution, best 100% coating grade are required here. These demanding requirements are already met worldwide with Hosokawa Alpine equipment. For standard GCC fillers in the range d97 = 8 - 45 m, a whole range of grinding / classifying processes are available with the focus on the lowest possible specific energy consumption.
Continuous development enables today 's ball mill classifying systems to cover a wide capacity and fineness range of d97 = 5 - 45 m. Vertical Dry Agitator Ball Mills, such as the ATR System, are used for the energy-efficient production of GCC powders in the range of d97 = 2.5 m to 10 m in the field of low to medium capacities. Greater finenesses up to d97 = 1.6m, especially at high outputs, are most efficiently produced by vertical wet mill systems such as the ANR-CL and either used directly as a slurry in the paint or paper industry or by means of an Atritor Cell Mill in a single process step dried, optionally coated and top cut cleaned by means of an integrated air classifier.
Dry processed GCC powder for the plastics industry achieves the highest quality available in the market by coating in a fully optimized Contraplex pin mill system with feed powder heating and top cut control by an MS-classifier with less than a few ppm residues on a 20 m wet sieve.
Manufacture and supply of GCC at consistent high qualityReadiness to deliver all GCC qualities, anytimeShifting the product portfolio significantly into the profitable range < d97 = 10 mEnsuring a constant and consistent particle size distributionPerfect top cut limitation coated and uncoated GCCAssuring highest possible quality of coated GCCLead the competition in fineness and qualityUse of processes with lowest specific energy consumptionUse of state-of-the-art machine diagnostics - Predictive maintenance
The Hicom mill is a high-intensity tumbling mill that can be used for fine and ultra-fine media grinding. Recent investigations on fine dry grinding with the Hicom 25 pilot plant, operating in closed circuit with an IAC 200 Inprosys high-efficiency classifier, have indicated that this milling combination is well suited to the efficient production of fine mineral powders. Closed circuit grinds were performed on 98% passing 94 m limestone to a range of product sizes from 98% passing 26 down to 6.4 m to determine the specific energy requirements for the milling of this material. The results from these tests show efficient classifier separation as well as rapid and efficient comminution in the Hicom mill.