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Calcium carbonate (Calcium carbonate)

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Calcium carbonate

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Calcium carbonate
Calcium Carbonate (synthetic)
Calcium carbonate,light powder

+Expand -Stow

471-34-1

CCAO3

100.0869

2836500000

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Product Description

1. Light calcium carbonate: amorphous powder, odorless and odorless. Slightly hygroscopic, stable in dry air, decomposed by acid. Heavy calcium carbonate: white powder, odorless and tasteless. Stable in the air. Almost insoluble water, slightly dissolved in water containing ammonium salt or ferric oxide. In case of dilute acetic acid, dilute hydrochloric acid, etc., it is dissolved and heated to release carbon dioxide and generate calcium oxide. Its activity is greater than that of ordinary calcium carbonate and has reinforcement. Active calcium carbonate: It is easily dispersed in the rubber compound and can improve the reinforcement. Calcium carbonate is divided into light calcium carbonate, heavy calcium carbonate and colloidal calcium carbonate. The particle size of light calcium carbonate is about 5 μm m.

2. Calcium carbonate whiskers belong to aragonite structure and are white powder. Needle-like or fibrous single crystal. It is a fibrous substance with good dispersion and uniform size. The aspect ratio of whiskers is 20~30, and the melting point is 759 ℃. High strength, good heat insulation performance and good compatibility with resin.

3. Calcium carbonate has calcite, aragonite and vaterite. Natural limestone is almost entirely calcite. The colorless crystalline powder prepared by chemical method is almost insoluble in water.

Nature Description

Density 2.93g/mL at 25°C(lit.)
Boiling point 333.6°C at 760mmHg
Melting point 825°C
Molecular formula CCaO3
Molecular weight 102.103
Flash point 197°C
Accurate quality 101.962982
PSA 63.19000
Appearance character white or colorless crystal or white powder or bulk
Refractive index 1.6583

不溶

Product Applications

Used for making cement, ceramics, lime, calcium salt, toothpaste, dye, pigment, mineral water, artificial stone, putty, absorben, Catalyst, filler, medical supplies, etc.; Used as filler for plastics, rubber and coatings; Used to produce anhydrous calcium chloride, sodium bichromate, glass, cement and building materials..

Production method

Preparation method of light calcium carbonate (471-34-1): carbonization method: the selected limestone is crushed to 50~150mm, and the particle size of smokeless (white) coal is 38~50mm. Coal and limestone are put into the furnace at the ratio of 1:8~1:11, and calcined at 900 ~ 1100℃ to decompose limestone into quicklime and carbon dioxide at high temperature. With 3~5 times of water, digested and dissolved at 90℃ for 1.5~2.0h, the lime milk concentration is 10~18 ° Bé, and filtered to remove impurities for carbonization. Carbon dioxide is sent to the carbonization tower after washing and purification. The concentration is 30% ~ 40%, the carbonization temperature is 60 ~ 70℃, the carbonization pressure is 0.078 Mpa, and the carbonization end point control pH value is 7. Calcium carbonate slurry is centrifuged (moisture content 32%~ 42%). After drying (moisture content below 0.3%), after cooling, crushing and sieving, the finished product of light calcium carbonate is prepared. Grinding method: the raw material of wet crocking calcium is heavy calcium carbonate or paper spar with whiteness> 93 degrees and calcium content> 98%. Superfine calcium carbonate is prepared by ingredients, wet crocking, pressure filtration, drying and packaging. ??? Precipitation method: limestone is calcined at high temperature to generate calcium oxide and carbon dioxide. Lime is digested with water to obtain calcium hydroxide. Lime milk reacts with purified carbon dioxide after Classification. Crystallization control agent is added during carbonization and crystallization, in order to control the crystal form, or add emulsifier and surface treatment agent to evenly cover the surface of the active agent with the newly generated fine calcium carbonate particles. After carbonization and crystallization, centrifugal dehydration, drying, grading, ultra-fine calcium carbonate is prepared by packaging. Safety: toxicity and protection: If limestone dust is inhaled for a long time, atrophitic khaki and bronchitis of upper respiratory tract often occur, accompanied by pulmonary emphysema. The crushed workers can see diffuse hardening type of dust lung. When working, pay attention to protecting respiratory organs and skin, and wear masks, gloves and work clothes to prevent sucking dust. Lined with double-layer polyethylene plastic bags, the outer packaging is packed with polypropylene woven bag, the net weight of each bag is 26kg or 40kg, and the packaging is marked with "fear of wet. Store in a cool and dry warehouse, avoid co-storage and mixed transportation with acid substances, pay attention to moisture-proof; Prevent rain during transportation, and handle with care when loading and unloading to prevent loose bags. The highest admissible concentration of limestone dust is 6mg/m3, and the admissible concentration of American marble dust is 10mg/m3. Just gently,

Security

Dangerous Goods Marking： Xi

Safety instructions： S26: in case of contact with eyes, rinse with plenty of water immediately and send it to the doctor for diagnosis and treatment. S37/39: use suitable gloves and goggles or mask.

Hazardous material category code： R36/38: it can irritate eyes and skin.

Storage conditions： 1. Food grade plastic bag jacket woven bag packaging. 2. Store in a cool, dry and ventilated place. 3. Do not store with toxic chemicals and liquid acids. Pay attention to moisture-proof.