Heavy calcium, also known as ground calcium carbonate. It is an inorganic compound made of calcite, marble, limestone and other ore raw materials by grinding with a heavy calcium grinding mill. So, what’s the difference between the heavy calcium produced from these ore materials? HCMilling(Guilin Hongcheng), as the manufacturer of the heavy calcium grinding mill that has been deeply involved in the calcium carbonate industry for many years, produces calcium carbonate Raymond mill, calcium carbonate ultra-fine ring roller mill, calcium carbonate superfine vertical roller mill and other equipment. The following describes the difference between the production of heavy calcium, calcite, marble and limestone.

1、 Contrast calcite, marble, limestone

Calcite: the ore has clear cleavage and transparency. The surface is divided into clear planes, which are still visible after crushing. Calcite mining area is widely distributed, and ores are also divided into large calcite and small calcite. Large calcite has clear cleavage, regular and high transparency; The calcite cleavage is disordered, fine and irregular. It should be noted that there are three colors of calcite ore, namely, milky white phase, yellowish phase and reddish phase. There may be differences in the color of each production area, and there may be some differences in the optical properties of processed calcium carbonate powder. In addition, the calcium content of calcite is higher than that of marble and limestone, reaching more than 99%. Most of the metal impurities are Fe, Mn, Cu, etc. The relative density is 2.5~2.9 g/cm3, and the Mohs hardness is 2.7~3.0.

Marble: also known as dolomite, it is composed of calcite, limestone, serpentine and dolomite. Among them, the composition of calcium carbonate accounts for more than 95%, the Mohs hardness is between 2.5-5, and the density is 2.6 to 2.8g/cm ³， The ore is divided into coarse crystal ore and fine crystal ore, and the crystal is generally cubic. The marble tone is mainly blue (grey) white, and the content of impurities such as magnesium oxide (0.2%~0.7%), ferric oxide (<0.08%), manganese (1~50mg/kg) varies significantly depending on the origin.

Limestone: Limestone is a kind of rock containing single calcite mineral composition, which is a combination of fine or aphanitic materials. It exists in two phases of calcite and aragonite, and is brittle and dense. Limestone contains more than 95% calcium carbonate, a small amount of dolomite, siderite, quartz, feldspar, mica and clay minerals that can reflect the color of stone, mainly white and gray. The main impurities of limestone include silicon dioxide, aluminum oxide, iron oxide, magnesium, strontium, etc. The Mohs hardness is 3.5~4, and the density is 2.7 g/cm3.

2、 Different uses of calcite, marble and limestone

Plastics: Marble and calcite are widely used, but calcite and marble have different color phases and crystal structures. The color, tensile force and impact resistance of products filled in plastic products will be different to some extent. Calcite belongs to hexagonal crystal system, and the crystal is generally in the shape of a date nucleus, with a large ratio of long to short diameters; Marble crystals are generally cubic in shape, with a small ratio of long to short diameters. The products such as PVC pipes and profiles are filled with calcite and marble with the same particle size distribution under the same formula. The products made of marble powder are easier to be brittle than those made of calcite powder, and the toughness is poor.

Papermaking: calcite and marble with low hardness and softer quality are selected as heavy calcium carbonate raw materials, which has low wear rate of equipment, and is favorable for protecting and extending the life of filter screen, cutter head and other parts of paper machine.

Latex paint: the composition of different calcium carbonate raw ores varies greatly. Generally, the purity of calcite ore is high, the calcium carbonate content is more than 96%, and the content of impurities such as magnesium oxide and ferric oxide is low or easy to remove, so the latex paint is more stable.

HCMilling(Guilin Hongcheng), based on the calcium carbonate industry chain, has provided good equipment support for calcium powder processing enterprises around the world. Our calcium carbonate Raymond mill, calcium carbonate ultra-fine ring roller mill, calcium carbonate superfine vertical roller mill and other heavy calcium production equipment are also favored by heavy calcium production enterprises. If you have relevant needs of heavy calcium grinding mill, please contact HCM.