Attapulgite is a kind of crystalloid hydrous magnesium-aluminum silicate mineral, having a special laminated chain structure in which there is a crystalline lattice displacement existed. Thus it makes the crystals contain uncertain quantities of Na+, Ca+, Fe3+ and Al, and present in the shape of needles, fibers or fibrous clusters. Attapulgite has very good colloidal properties such as: specific features in dispersion, high temperature endurance, salt and alkali resistance, and also high adsorbing and de-coloring capabilities. Furthermore, attapulgite has certain plastic and adhesive characters. Its ideal molecular formula is:
Attapulgite clay mineral resources distribute in only several countries in the world at the present. Attapulgite reserve capacity of Xuyi contains the 70% in China, and 35% in the world. Compared to the largest commercial attapulgite deposits in the United States, Xuyi attapulgite products have the following special features:
Because the geological conditions under which Chinese attapulgite was deposited are different from that of the USA attapulgite deposits, our attapulgite products have very low grit (percentage retained on a 325 mesh wet screen), low free silica content, and low carbonate content.
Selectively mined and processed attapulgite products have a very high dispersion viscosity and API yield. The products processed from naturally occurring mixtures of attapulgite show especially high dispersion viscosity, high API yield, and extremely low grit.
Physical analysis results of attapulgite clay
Toxicological test result of the attapulgite: Both Nanjing Municipal
Sanitation and Antiepidemic Station and Nanjing Municipal Foodstuff Research
Institute have carried out "The Comprehensive Sanitation and Safety
Assessment on the Attapulgite Clay, a Natural Foodstuff Processing adjuvant".
Their test results are as follows: Such heavy metals as arsenic, lead
and mercury are not detectable in the attapulgite clay product, while
total iron, sulfates, chlorides, nitrites, etc. are within the limits
called for by the standards for processing adjuvant concerned. The tests
on the content of the natural radioactive nuclide 238V,232TH,226Ra,40K,
and the natural R radiation dosage at the surface of the mining area show
that in the original ore and in the product those figures are lower than
that in the natural background value, therefore they are within the normal
range. The Ames test reveals negative results and there is no positive
reaction on the micronucleus incidence rate of the polychromatic erythrocytes
in the bone marrow chromosome of mice. The max non-reaction dosage to
animals is 9,909.01mg/kg, showing that the test material is very safe
to the health of humans and animals.
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