tincalconite


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tincalconite

[tin′kal·kə‚nīt]
(mineralogy)
Na2B4O7·5H2O A colorless to dull-white mineral, crystallizing in the rhombohedral system; one of the principal ores of borax and boron compounds. Also known as mohavite; octahedral borax.
References in periodicals archive ?
The dominant phases in the XRD pattern are CaMg [(C[O.sub.3]).sub.2] (dolomite), MgO (periclase), [Na.sub.2][[B.sub.4][O.sub.5][(OH).sub.4]] x 3[H.sub.2]O (tincalconite), Si[O.sub.2] (quartz) ([Ca.sub.6][Al.sub.1.5][Si.sub.0.5][(S[O.sub.4]).sub.2]B [(OH).sub.12][O.sub.4] x 26([H.sub.2]O) (charlesite), and CaC[O.sub.3] (calcite).
Yuceer, Nonisothermal Dehydration Kinetics of Tincalconite by Thermal Analysis Data, J.
Boncukyuoglu, "Determination of photon energy absorption parameters for pellet waste, trommel sieve waste and original tincalconite," Annals of Nuclear Energy, vol.
* Tincal (pronounced tinkle) is the ancient, but still-used name to describe [Na.sub.2]O[center dot][B.sub.4][O.sub.7][center dot]10[H.sub.2]O, t the principal sodium borate mineral commonly called "borax." It is also known by its mineralogic name, tincalconite.
: Summary: Kinetic parameters of tincalconite during thermal decomposition were explored with TGA data.
Keywords: Tincalconite; Thermal Decomposition; Suzuki Method and Coats-Redfern Method.
In this study, thermal decomposition related kinetic parameters for tincalconite were analyzed with TGA data and by means of Coats-Redfern [11] and Suzuki methods [12].
For studying the dehydration kinetics of tincalconite from thermogravimetric data, tincalconite particle sizes between 0.075-1.2 mm and3 different heating rates were chosen, which were 5,10 and 12 C min1.
The major peak value around 149 C is due to the first dehydration of tincalconite and the second peak value around 700 C is due to the second dehydration and subsequent boiling of the sample.
According to the results, the dehydration of tincalconite probably occurs in two steps as given below:Region I; mass loss: %21, temperature range: 190-215 C equationPartial loss of water from hydrated minerals is represented in this step.
Among these raw materials boric acid ([H.sub.3]B[O.sub.3]), tincalconite ([Na.sub.2][B.sub.4][O.sub.7] x 5[H.sub.2]O), and borax ([Na.sub.2][B.sub.4][O.sub.7] x 10[H.sub.2]O) have a minimum purity of 99.9% and boron oxide ([B.sub.2][O.sub.3]) has a minimum purity of 98%.
Sodium-boron source of [Na.sub.2][B.sub.4][O.sub.7] x 5[H.sub.2]O was determined as "tincalconite" (reference code: 01-079-1529) and another sodium-boron source of [Na.sub.2][B.sub.4][O.sub.7] x 5[H.sub.2]O was found as the mixture of both "borax" (reference code: 01-075-1078) and "tincalconite" (reference code: 01-079-1529).