Barite (Ba(SO4) 99%

Barium sulfate mineral called barite. For white amorphous powder. Properties of stability, hardly soluble in water, acid, alkali or organic solvents. Radiological examination with barium sulfate, which make use of the X ray can be absorbed in the gastrointestinal tract and make its enhancement effect, thus mainly used for gastrointestinal contrast agent. Used in the manufacture of barium salt, etc.

Colorless orthorhombic system crystal or white amorphous powder. Dry to caking. Relative density 4.50 (15 ℃), melting point 1580 ℃. Almost insoluble in water, ethanol and acid. Soluble in hot concentrated sulfuric acid. Polycrystalline shifts occurred at about 1150 ℃. At about 1400 ℃ began to break down significantly. Chemical stability. At 600 ℃ for barium sulfide with carbon reduction.

Solubility when 20 ° C is 2.4 * 10 ^ - 3 g, at 25 ° C Ksp 1.1 * 10 ^ - 10 [1]. All part of barium sulfate in water ionization for strong electrolyte.

USES:

Barite belongs to the non-renewable resources, is one of China's export advantage minerals, widely used in petroleum, natural gas drilling mud weighting agent, barium in consumption in the field of chemical industry, packing and so on are also increased year by year. Barite fairly rich resources in our country, distribution in 21 provinces (area), the total ore reserves of 360 million tons, the world in the first place. On the medical contrast agents can be used in the digestive system.

Barite in coating also can be used as a inert pigment added into coating, can improve the paint film cover, compactness, etc. To a certain extent to improve the performance of the coating.

In medicine can be used in the inspection of the digestive tract, or barium meal. Because it does not dissolve in water and lipid, so won't be absorbed by the gastrointestinal mucosa, so basic non-toxic to people. Barium meal gastrointestinal barium imaging, refers to the barium sulfate was used as contrast agents, according to the digestive tract under X-ray irradiation with and without pathological changes of a kind of examination method. The principle of X-ray examination, because the density of various organs, tissues and the thickness is different, so show the natural level of contrast black and white. But in some parts of the body, especially the abdomen, because internal broadly similar density of several kinds of organs, tissues, have to import the harmless to the human body the contrast agent (such as medical barium sulfate), artificially increase according to contrast, to achieve the ideal effect of inspection. Methods to examine the clinical called X-ray angiography examination.