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What are the safety measures for calcium carbonate? A calcium carbonate manufacturer is here to explain!
Release time:
2023-05-11
According to calcium carbonate manufacturers, calcium carbonate is an inorganic compound with the chemical formula CaCO₃ and serves as the primary constituent of limestone, marble, and other similar materials. It is essentially insoluble in water but dissolves in hydrochloric acid (undergoing a reaction with the acid). As one of the most common substances on Earth, it is found in minerals such as aragonite and calcite, as well as in chalk, limestone, marble, travertine, and other rocks. It also constitutes the main component of the skeletons and shells of certain animals. Moreover, calcium carbonate is an important building material with a wide range of industrial applications.
According to calcium carbonate manufacturers, calcium carbonate is an inorganic compound with the chemical formula CaCO₃ and is the primary constituent of limestone, marble, and other similar materials. It is essentially insoluble in water but dissolves in hydrochloric acid (undergoing a reaction with the acid). As one of the most common substances on Earth, it occurs in minerals such as aragonite and calcite, as well as in chalk, limestone, marble, travertine, and other rocks. It also forms the main structural component of the skeletons and shells of certain animals. Moreover, calcium carbonate is an important building material with a wide range of industrial applications.
What are the safety measures for calcium carbonate? A calcium carbonate manufacturer is here to explain!
Environmental Hazards: This substance is essentially harmless to the environment; however, it should not be discharged into water without authorization.
Health hazards: Workers engaged in mining and processing frequently develop upper respiratory tract inflammation and bronchitis, which may be accompanied by emphysema. Chest radiographs reveal calcification and increased pulmonary markings. The development of pneumoconiosis in these workers is primarily associated with silica impurities contained in this product.
Storage Instructions: 1. Package in food-grade plastic bags and then enclose in woven bags. 2. Store in a cool, dry, and well-ventilated area; the product may be sealed under conditions of (25°C, 100 kPa). This product is not subject to regulatory control. 3. Do not store together with toxic chemicals or liquid acids. Take precautions against moisture.
What are the preparation methods for precipitated calcium carbonate? A calcium carbonate manufacturer is here to introduce them!
The production principle is essentially the same as that for light-grade calcium carbonate. The difference lies in the stringent control of carbonation conditions to produce ultrafine calcium carbonate, followed by surface treatment with 1% to 5% stearic acid, resin acids, lignin, or cationic surfactants, in order to modulate particle agglomeration and inhibit crystal growth.
Preparation method for calcium carbonate whiskers: First, 1 to 2 micrometer-long needle-like calcium carbonate whiskers and a phosphate compound are added to a Ca(OH)2 slurry, followed by bubbling CO2 gas through the mixture to obtain calcium carbonate whiskers. Alternatively, industrial quicklime is digested, and carbon dioxide gas is introduced into a magnesium chloride solution of a specified concentration to induce a gas–liquid reaction; after dehydration and drying, calcium carbonate whiskers are obtained.
What is the preparation method for ultrafine, lightweight calcium carbonate? A calcium carbonate manufacturer is here to introduce it to you!
Typically, ultrafine lightweight calcium carbonate is produced by carbonating lime milk. Limestone is calcined to decompose into quicklime and carbon dioxide. The quicklime is then slaked to form lime milk. Carbon dioxide is subsequently introduced into the lime milk to carry out a carbonation reaction, yielding calcium carbonate, after which a surface treatment agent is added to the calcium carbonate slurry for particle surface modification. The product is then subjected to sequential processing steps, including filtration, drying, pulverization, and sieving, to obtain the final product.
What are the methods for preparing heavy calcium carbonate? A calcium carbonate manufacturer is here to introduce them!
(1) Crushing method: First, white stone containing more than 90% CaCO3 is coarsely crushed in a rotary crusher until the large rock fragments can pass through a 76 mm sieve. Subsequently, fine grinding is carried out in a hammer mill, rotary hammer mill, cage mill, pestle mill, roll mill, hard grinder, or wheel mill, reducing the CaCO3 particles to pass through a 100-mesh sieve. The ground product is then further pulverized using a Raymond vacuum mill or a stone-crushing mill equipped with a pulverizing collector and vacuum piping; after air classification, oversized particles are removed by centrifugal separation using either a counter-rotating impeller or multi-blade guide vanes. The resulting material is then screened and graded to obtain the finished product. (2) Displacement method: A solution of calcium chloride at a specified concentration is added to a sodium carbonate solution of a specified concentration to induce a displacement reaction, followed by precipitation, separation, drying, pulverization, and sieving.
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