Heavy calcium carbonate is one of the non-metallic mineral materials with high production and application scale in the world today. It is widely used in plastics, papermaking, rubber, coatings, adhesives, inks, toothpaste, feed, food additives, etc.

In order to distinguish it from light calcium carbonate, natural carbonates such as calcite, limestone, marble, chalk, and shells are often used as raw materials, and the mineral powder made by mechanical crushing is called heavy calcium carbonate (referred to as heavy calcium carbonate). At present, the raw materials for heavy calcium powder in China are all formed by regional metamorphism and thermal contact metamorphism of carbonates.

Heavy calcium is one of the earliest and most commonly used fillers in the rubber industry. It can not only increase the volume of products, but also save expensive natural rubber or synthetic rubber, achieving the goal of reducing costs.

The main functions of heavy calcium in the rubber industry are:

1、 Improve processing performance. In general rubber product formulas, it is often necessary to add several portions of heavy calcium; In light colored fillers, heavy calcium has good dispersibility and can be mixed with rubber in any ratio, or other additives can be mixed together, making mixing convenient.

2、 Improving the properties of vulcanized rubber, playing a reinforcing and semi reinforcing role. Ultrafine and micro calcium carbonate filled rubber can achieve higher expansion strength, wear resistance, and tear strength than pure rubber sulfides. The finer the calcium carbonate particles, the more significant the improvement in rubber expansion strength, tear strength, and flexibility.

3、 In rubber processing, it plays a special role. In vulcanized rubber, heavy calcium can adjust the hardness, while in the rubber industry, the hardness is often adjusted by changing the amount of calcium carbonate filling.

Guilin Hongcheng provides various models of grinding machine equipment suitable for fine and ultrafine powder processing in China’s heavy calcium powder processing. Several series of products, including HC series fine powder grinding machines, HCH series ultrafine grinding machines, and HLM series vertical grinding machines, are widely favored by heavy calcium powder processing enterprises.