Abstract I. INTRODUCTION At present, the global demand for non-metallic mineral powders is growing. In the past 10 years, the demand for heavy calcium has increased from 35 million tons to nearly 90 million tons, with an average annual growth rate of nearly 9.5%. According to the prediction of relevant institutions, in the next 10 years,...
I. INTRODUCTION At present, the global demand for non-metallic mineral powders is growing. In the past 10 years, the demand for heavy calcium has increased from 35 million tons to nearly 90 million tons, with an average annual growth rate of nearly 9.5%. According to the forecast of relevant institutions, the annual global demand for non-metallic mineral powders will continue to maintain a high growth rate in the next 10 years. Heavy calcium carbonate, referred to as heavy calcium, is a natural carbonate mineral (such as calcite, marble, limestone). It is a commonly used powdery inorganic filler, which can be widely used in paper, plastic, rubber, paint, Industries such as coatings, adhesives and sealants.
Second, the comparison of ultra-fine heavy calcium processing equipment At present, China's non-metallic ore dry superfine grinding and grinding equipment mainly includes Raymond mill, agitator mill, vibrating mill, ring roller mill, ball mill and vertical mill.
Raymond mill mainly processes 200-400 mesh powder products, which is the mainstream equipment for processing powder products below 325 mesh. The classifier can be graded to produce 800 mesh products, but the output is small. The mixing mill with sub-micron classifier can be used to process 1250 ~ 6000 mesh products, but the ability is small. The vibration grinding and classifying machine can be used to process 600-2500 mesh products, but the capacity is small and the energy consumption is high. It is mainly used for material processing with special hardness. Ring roller mill is mainly used for processing 800-1500 mesh products, which has the advantage of low energy consumption, but the single-machine production capacity is not big enough. The ball mill plus super-segmentation machine can process 600-2500 mesh ultra-fine powder at one time. The single-machine production capacity is large, the performance is stable and reliable, but the energy consumption is slightly higher. The vertical mill has the advantages of large single machine capacity, reliable operation, large output, stable product quality and low energy consumption (30%-40% energy saving compared with ball mill). From the stand-alone production scale of ultra-fine products, the single-machine production capacity of impact mill, dry sand mill and ring roller mill is small. In comparison, ball mills and vertical mills can achieve higher yields under the same conditions, and are easy to achieve heavy calcium scale processing. I have to admit that the single-machine capacity of the ball mill is the largest. When producing more than 1250 mesh products, the performance is more outstanding. This is unmatched by other equipments. However, the fineness of the powder milled by the ball mill is uncontrollable and the energy consumption is low. There are no advantages in environmental protection and energy conservation.
In contrast, the vertical mill utilizes the principle of crushing and pulverizing, and the particles that have been crushed to the particle size requirement can be taken away with the air flow in an instant, thereby avoiding the situation that the ball mill is over-grinded, thereby achieving the purpose of energy saving.
Third, the application of ultra-fine vertical grinding in the production of ultra-fine heavy calcium processing From the perspective of the diversified demand for heavy calcium powder products, the vertical grinding + secondary (or Three times) "Classification process. There are two reasons: 1. Large-scale energy-saving ultra-fine production using vertical mill; 2. The use of secondary grading is conducive to product refinement.
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