Uses of Heavy Calcium Carbonate in Various Industries
Heavy calcium carbonate, referred to as heavy calcium, is a colorless, odorless white powder that is almost insoluble in water and alcohol. It will bubble and dissolve when it encounters dilute acetic acid, dilute hydrochloric acid, and dilute nitric acid. It begins to decompose into calcium oxide and carbon dioxide when heated to 898°C.
Heavy calcium carbonate is made by grinding natural carbonate minerals such as calcite, marble, and limestone. It is a commonly used powdered inorganic filler with the advantages of high chemical purity, high inertness, low chemical reaction, good thermal stability, no decomposition below 400°C, high whiteness, low oil absorption, low refractive index, soft, dry, no crystal water, low hardness, low wear value, non-toxic, tasteless, odorless, and good dispersibility.
Heavy calcium carbonate is used as a filler and is widely used in daily chemical industries such as artificial floor tiles, rubber, plastics, papermaking, coatings, paints, inks, cables, building supplies, food, medicine, textiles, feed, toothpaste, etc.; as a filler, it increases the volume of the product and reduces production costs. When used in rubber, it can increase the volume of rubber, improve the processability of rubber, play a semi-reinforcement or reinforcement role, and adjust the hardness of rubber.
Coal-fired power generation industry:
Coal-fired power plants use heavy calcium carbonate powder in flue gas desulfurization. Flue gas desulfurization synthesizes calcium sulfite with heavy calcium carbonate and sulfur dioxide produced during coal combustion and then oxidizes it into gypsum (calcium sulfate) in contact with air, which can effectively reduce the emission of sulfur dioxide produced by coal-fired power plants by 90%. The desulfurized gypsum produced can be sold directly to cement plants or gypsum board plants as products. The amount of calcium carbonate desulfurization powder used is related to the sulfur content in coal. Usually, a 300,000-kilowatt coal-fired power plant requires 40,000 tons of desulfurization powder per year.
Heavy calcium powder for the rubber industry:
Heavy calcium carbonate is one of the fillers used in the rubber industry. A large amount of heavy calcium is filled in rubber to increase the volume of its products and save expensive natural rubber, thereby reducing costs. Heavy calcium is added to rubber to obtain higher tear strength and wear resistance than pure rubber sulfide.
Heavy calcium powder for the plastic industry:
The heavy calcium carbonate powder for plastic masterbatch and masterbatch is 400 mesh, and the whiteness is required to remain unchanged after high-temperature heating. The ore structure is large crystalline calcite, with calcium carbonate content: of 99%, and whiteness: of 95%. Heavy calcium can play a skeleton role in plastic products, which has a great effect on the dimensional stability of plastic products. It can also improve the hardness of products and improve the surface gloss and surface smoothness of products.
Heavy calcium powder for the paint industry:
The heavy calcium carbonate powder used in latex paint is 800 mesh or 1000 mesh, whiteness: 95%, calcium carbonate: 96%. The amount of heavy calcium used in the paint industry is also large, for example, the amount used in thick paint is more than 30%.
Heavy calcium powder for the water-based paint industry:
The heavy calcium carbonate powder for water-based paint is 800 mesh or 1000 mesh, whiteness: 95%, calcium carbonate: 96%. Heavy calcium plays a great role in the water-based paint industry. It can make the paint have the characteristics of no sedimentation, easy dispersion, good gloss, etc. The dosage in water-based paint is 20-60%.
Heavy calcium powder for the papermaking industry:
Heavy calcium carbonate powder for papermaking is 325 mesh, the whiteness requirement: is 95%, calcium carbonate content: is 98%. Heavy calcium plays a very important role in the papermaking industry, which can ensure the strength and whiteness of paper, and the cost is relatively low.
Heavy calcium powder for the feed and fertilizer industry:
Heavy calcium powder is used as a calcium element increaser in the feed industry to replace the original shell powder and reduce costs.
Heavy calcium powder of different whiteness is used in the fertilizer industry to play a role in fertilizer particle size molding and color adjustment.
Heavy calcium powder for the construction industry (dry mortar, concrete):
Heavy calcium carbonate powder for dry mortar is 325 mesh, the whiteness requirement: is 95%, calcium carbonate content: is 98%. Heavy calcium plays an important role in concrete in the construction industry. It can not only reduce production costs but also increase the toughness and strength of products.