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Calcium Carbonate

Calcium Carbonate structure
  • CAS No:

    471-34-1

  • Formula:

    CCaO3

  • Synonyms:

    NZ; PZ; CCCR; CCW; N34; N43; TM1; K250; Omya; SS30

  • China Export:

    From 2018.11 to 2019.11, total export volume of Calcium Carbonate from China was 119,879,147KG while total export value was $35,777,218. The biggest proportion of exporting volume in the last 12 months was 10.01% in 2019.04.

  • Categories:

    Industrial Coatings  >  Paint Pigment & Filler

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Description

Calcium carbonate occurs in two forms—hexagonal crystal known as calcite, and orthorhombic form, aragonite. Calcite decomposes on heating at 825°C, aragonite melts at 1,339°C (at 102.5 atm). Density 2.71 g/cm3 (calcite), 2.83 g/cm3 (aragonite); insoluble in water (15mg/L at 25°C); Ksp 4.8x10–9 ; soluble in dilute mineral acids. Calcium carbonate occurs as an odorless and tasteless white powderor crystals.

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Basic Attributes

  • 471-34-1

  • CCaO3

  • 100.08700

  • 99.94730

  • 63.19000

  • -2.44700

  • 615-782-4

  • VTYYLEPIZMXCLO-UHFFFAOYSA-L

  • 3

  • 0

  • 0

Characteristics

  • White-beige to slightly beige-gray random crystals

  • 2.93 g/mL at 25°C(lit.)

  • 825 °C

  • 333.6ºC at 760mmHg

  • 197ºC

  • 1.6583

  • H2O: Insoluble

  • Low temperature, ventilation, drying

  • 0 mmHg (approx)

  • Stable. Incompatible with acids, fluorine, ammonium salts, alum.

Safety Information

  • 2836500000

  • NONH for all modes of transport

  • -

  • R36/37/38; R41

  • S26-S36/37/39-S37/39

  • FF9335000

  • Xi

  • Separated from acids, aluminium, ammonium salts, fluorine and magnesium.

  • P201, P202, P260, P261, P264, P270, P271, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P310, P312, P314, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501

  • H315

  • Noncombustible Solid

  • LD50 orally in Rabbit: 6450 mg/kg LD50 dermal Rat > 2000 mg/kg

Usage

Used to improve the flexural resistance of PVC soft products. It is also widely used in rubber, adhesives and sealants as fillers and reinforcing agents; used as analytical reagents, reference reagents, silicon single crystal slice glue and thick film capacitor materials ; Mainly used as filling and reinforcing materials in rubber, plastics and coating industries; used in the production of cement, ceramics, lime, carbon dioxide, chalk, artificial stone, putty, and used as pigments, neutralizers, polishes, plastics and rubber Filler

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Production Methods

1. Light calcium carbonate: from limestone to produce light calcium carbonate, including calcination, digestion, carbonation, separation, drying, grinding and other processes. Calcium carbonate content of raw materials in limestone should be more than 96%, about 1% magnesium salt, iron, aluminum oxide in 0.5% or less. Therefore, before use to select the limestone, and broken to 50 ~ 150mm. Coal requirements White coal, the first should be broken to 38 ~ 50mm particle size. Lime kiln for vertical kiln, continuous operation. The ratio of coal and limestone is 1: 8 ~ 1:11 mixed well, from the top into the kiln, at 900 ~ 1100 ℃ under calcination. The raw material is continuously added from the top of the kiln, and the generated calcium oxide is continuously taken out from the bottom of the kiln. Decomposition reaction of carbon dioxide generated by the dust, washing, drying, compression1. To the carbonization process. Calcium oxide added to the ash pool, with 3 to 5 times the water for digestion, digestion temperature of 90 ℃, time 1.5 ~ 2h. Digestion of lime milk concentration of 10 ~ 18 ° Bé. After filtering to remove impurities in the raw slurry storage tank, stirring sent to the carbonation tower, carbonation tower for vertical gas bubbling reactor. The refined carbon dioxide gas is compressed and introduced from the bottom of the carbonization tower, and enters the tower through the gas distributor, and comes into contact with the milk of the lime for carbonation reaction.Carbonization temperature is 60 ~ 70 ℃, carbonization pressure is about 0.08MPa, carbonation reaction time and the concentration of carbon dioxide, flow and liquid volume and different. The end point of carbonation can be determined by the determination of pH value, when the pH value of 7 or so, is the end. Carbonated calcium carbonate slurry is cooked pulp, placed in the cooked pulp pool, and then use the centrifuge dehydration, dehydration of calcium carbide after the water content of 32% to 42%, known as wet powder. The wet powder is continuously fed into a rotary drying furnace for drying, and the material discharged from the drying furnace contains less than 0.3% of water. And then cooled, crushed, sifted, that was finished.2. Activated calcium carbonate: production principle and production of light calcium carbonate is basically the same principle. Except that the carbonization conditions were strictly controlled to produce fine particles of calcium carbonate and surface treatment by adding 1 to 5% of stearic acid, resin acid, lignin or cationic surfactant to adjust the aggregation state of the particles and Prevent the growth of crystal particles. The stearic acid method is described as follows.(1) Preparation of glue 4.5kg36 ° Bé sodium hydroxide, add 70 ℃ hot water 40kg, stirring for the solution. After 15 kg of stearic acid and 40 kg of water were dissolved by heating, the solution was slowly added to the above-mentioned alkali solution with stirring to form sodium stearate. Then, 6 kg of Swire Oil was added. The solution was adjusted to neutral and water was added to a total weight of 162 kg. The amount of plastic for 3t finished surface treatment.(2) sizing operation in the production of light calcium carbonate in the process, from limestone calcination to carbonation of all equipment and operations are suitable for the production of activated calcium carbonate. The carbonated calcium carbonate slurries are put into a hot slurry tank, and the prepared sodium stearate oil is slowly added with stirring. Per ton of product plus plastic amount of 54kg, the finished product containing the ester content of 0.5%. Add the glue and continue stirring for a period of time, so that the material fully mixed.(3) post-treatment of sizing calcium carbonate after centrifugal dehydration, placed in the dryer, the first by natural or normal temperature ventilation to dry, so that water content down to 10% to 15%, and then drying at 80 ℃, Moisture content below 0.5%. And then the first 24-mesh sieve, and then 100 mesh sieve, that was finished. Heavy calcium carbonate: First, the CaCO3 containing more than 90% of the white crusher crusher in the rotary crusher, so that large rocks can be broken through the 76mm screen. And then finely pulverized in a hammer mill, a rotary hammer mill, a squirrel-cage pulverizer or a breaker, a rotary mill, a hard grinder or a wheel mill to break CaCO3 to pass through a 100 mesh screen. And finally pulverized by a Raymond vacuum mill or a gravel mill with a comminution collector and a vacuum tube. Air separation, that is, the use of counter-rotating or multi-leaf guide plate by centrifugal separation to remove the excessive size of the pellets. The material obtained by screening classification derived products.Reaction formula: -> -> 3. Calcium carbonate whisker method: Ca (OH) 2 slurry in advance by adding 1 ~ 2μm needle-like calcium carbonate whiskers and phosphate compounds, and then into the CO2 gas to be calcium carbonate whiskers. Or industrial lime for digestion, in a certain concentration of magnesium chloride solution, and then into the carbon dioxide gas for gas-liquid reaction, dehydration, drying to be calcium carbonate whiskers.4. Superfine light calcium carbonate system of law: usually using lime milk carbonation production of ultra-fine light calcium carbonate. Limestone is calcined and decomposed into quick lime and carbon dioxide. Quicklime digestion produces lime milk. Carbon dioxide is introduced into the milk of the lime, calcium carbonate is produced by the carbonation reaction, and a surface treatment agent is added to the calcium carbonate slurry to perform particle surface treatment. Then, filtration, drying, crushing and screening process in turn to get the product. Heavy calcium carbonate:(1) crushing method: Whitehead (natural limestone) in the jaw crusher in the first crushing, so that the block degree of 40-60mm, and then raised to the Raymond crusher crusher to crush. The pulverized semi-finished product is blown to a cyclone classifier by a blower and classified. The crude product is returned to the pulverizer for further processing. Qualified products by cyclone separation that is, the product. Superfine calcium carbonate:(2) grinding method: wet grinding calcium raw material is heavy calcium carbonate or white> 93 °, calcium> 98% calcite, the ingredients, wet grinding, pressure filtration, drying, packaging.(3) .Precipitation method: limestone calcination at high temperature to produce calcium oxide and carbon dioxide, lime water digestion in calcium hydroxide, lime milk after classification and purification of carbon dioxide reaction, carbonization crystallization by adding crystallization control agent to control the crystallization type, Or add emulsifier and surface treatment agent, so that the active agent and just the surface of calcium carbonate particles evenly covered, carbonized and then by centrifugal dehydration, drying, grading, packaging in the system. Reaction formula: -> ->

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Downstream Products

China Calcium Carbonate Export Data

Data referenced from General Administration of Customs,P.R.China

2018.11-2019.11 China - America  Calcium Carbonate Export Data

From 2018.11 to 2019.11, total export volume of Calcium Carbonate from China to America was 832,975KG while total export value was $291,429. The biggest proportion of exporting volume in the last 12 months was 18.01% in 2018.11.

2018.11-2019.11 China Calcium Carbonate Export Data

From 2018.11 to 2019.11, total export volume of Calcium Carbonate from China was 119,879,147KG while total export value was $35,777,218. The biggest proportion of exporting volume in the last 12 months was 10.01% in 2019.04.

2018.11-2019.11 TOP10 Purchasing Countries' Export Data of Chinese Calcium Carbonate

From 2018.11 to 2019.11, China has exported Calcium Carbonate to 105 countries in total. Country ranks by import volume from high to low is Philippines, Indonesia, Thailand, Vietnam, Malaysia, South Africa, Bangladesh, Taiwan, Sri Lanka, Brazil. The highest export volume was China to Philippines, accounting for 6.73% of the total volume of China.

Check Export Data for More Purchasing Countries

Purchasing Country Export Volume(KG) Export Percentage Export Value($)

Philippines

13,724,262

6.73%

2,061,492

Indonesia

11,919,781

5.85%

2,408,555

Thailand

8,948,142

4.39%

1,949,336

Vietnam

8,759,277

4.30%

2,543,485

Malaysia

7,103,700

3.48%

1,647,837

South Africa

5,733,353

2.81%

2,353,235

Bangladesh

5,587,450

2.74%

945,759

Taiwan

4,511,932

2.21%

596,641

Sri Lanka

4,356,500

2.14%

570,540

Brazil

3,924,500

1.92%

1,386,224

Tanzania

3,649,429

1.79%

394,983

Oman

3,129,590

1.53%

238,341

Myanmar

3,003,700

1.47%

1,460,859

Algeria

2,917,860

1.43%

2,396,402

Pakistan

2,836,086

1.39%

504,221

India

2,408,370

1.18%

903,638

Italy

2,212,900

1.09%

2,335,222

Ghana

2,182,403

1.07%

1,287,134

Democratic Republic Of The Congo

2,083,605

1.02%

101,202

Kenya

1,845,295

0.90%

574,210

Hongkong

1,213,400

0.60%

129,124

Sudan

1,155,000

0.57%

75,996

Russia

1,079,615

0.53%

616,349

North Korea

1,047,876

0.51%

325,307

Australia

988,045

0.48%

336,354

Kampuchea (cambodia )

966,380

0.47%

112,971

Korea

916,310

0.45%

313,539

Chile

884,660

0.43%

113,408

America

832,975

0.41%

291,429

Angola

751,601

0.37%

598,065

Price Analysis

  • 2021-06-10

    Reference price of Calcium Carbonate is 329.463USD/MT, up 1.68% from 324.034USD/MT on 2021-04-26.

  • 2021-04-26

    Reference price of Calcium Carbonate is 324.034USD/MT, up 0.23% from 323.286USD/MT on 2021-03-22.

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