Calcium Carbonate Pigment As Physical Description And Related Applications - Calcium Carbonate,

Precipitated calcium carbonate filler There are several mature manufacturing process

, manufacturers may use different methods to manufacture different grades of paint, but the public is with the Department, is the use of natural precipitation of calcium carbonate as raw material, made of oxide calcined calcium (lime), and then hydrolyzed with calcium hydroxide. In this process there are many methods used to remove almost all impurities, and no decomposition of large particles of limestone into lime.

Print Network HC Body paint is usually known as filler, from the natural world come, directly manufactured or obtained as a by-product. These substances are mainly barium, calcium, magnesium, or aluminum salts, silicon or aluminum oxide, or the former two types of material derived complexing double salts, in the paint, ink, linoleum, plastic materials, paper and paper coatings , linoleum, putty, wipe light wash material, rubber products, cement, plastics, ceramics and other fields have a wide range of uses.

They are close and white opaque pigments, and body type and quantity of pigment, and the use of traditional industries will be pushed even further development. The connection of these two pigments: refractive index lower than 1.75 (usually 1.45 to 1.70), color is white or nearly white. Other changes in the nature of physical paint a wide range, such as the relative density, capacity value, particle shape, particle size, size distribution, oil absorption, chemical activity, etc..

Calcium carbonate Calcium carbonate is mainly obtained from the limestone, or as a byproduct of some manufacturing processes, or directly on the milk of lime slurry with carbon dioxide reaction.

Natural calcium carbonate can manufacture dry grinding method or wet method. Dry grinding method in the dry milling a good product through the air separator to isolate the particles too large to return heavy grinding. Use wet method can produce smaller and more colorful, screening and better grades. Limestone in the presence of water under the conditions of grinding, the use conical or tube mill to mill products continuous release, centrifuge separation, excessive grain and feed back with heavy grinding. Another important advantage of wet method is the flotation could be improved through further product color and purity. In the continuous grinding process, there are many types of grinding machine can be used, but in principle should be to use air, high temperature air or superheated steam as a liquid. With access to raw materials and the liquid grinding machine, collided at high speed the friction caused by grinding, grinding pigment control of the process liquid and fine particles and liquid to flow together. Mill in general are both functions of sorting and grinding. Precipitated calcium carbonate filler

There are several mature manufacturing process, manufacturers may use different methods to manufacture different grades of paint, but the public is with the Department, is the use of natural precipitation of calcium carbonate as raw material, made of oxide calcined calcium (lime), and then hydrolyzed with calcium hydroxide. In this process there are many methods used to remove almost all impurities, and no decomposition of large particles of limestone into lime.

1. Bicarbonate method of controlling calcium hydroxide and carbon dioxide in the reaction process, available in different particle size of calcium carbonate, precipitated calcium carbonate, but for all concerned, the powder particle size is generally moderate.

2. Byproducts method This method uses calcium hydroxide slurry and sodium carbonate reaction, can produce very fine calcium carbonate particles. This process requires special attention is to completely clean all the sodium hydroxide to the composition, or with the alkaline calcium carbonate pigment, lead in paint application problems.

3. Calcium chloride method reactants in this method are usually obtained by other chemical processes, for example, when sodium bicarbonate obtained in the manufacture of ammonium chloride and calcium hydroxide and calcium chloride mixture can produce ammonium hydroxide, calcium chloride and sodium carbonate reaction calcium carbonate available to a very fine, and fill the color purity, particle size distribution is similar. Of course, the need to carefully wash away all of the sodium chloride components. Calcium carbonate calcium chloride obtained with calcite crystal structure, particle size is usually 8 ~ 10 m, the minimum range of 0.03 ~ 0.05 m. The lime method and the product is aragonite, the particle size is generally 0.2 ~ 2.0 m. Xu grade calcium carbonate fillers are the relative density of between 2.70 ~ 2.77, oil absorption capacity of 5 ~ 45g/100g, the average particle size from less than 1 m to very large, 200 sieve residue (about 300 m) is usually 25 ~ 30% of the production process by controlling the availability of colloidal range (less than 0.1 m) particle size distribution of the product.

Calcium carbonate insoluble in water, the majority of oil-based resin coating material is inert, but its diluted acid-sensitive class. The nature of the benefit of calcium carbonate coatings in many indoor applications such as paint, lacquer and other half-light, high light paint, paint, and many other industrial coatings also have some application.

by: gaga

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