Some of the commonly used commercial boron derivatives are borax, colemanite, ulexite
, kernite, probertite and szaibelyite (Ozkan et al., 1997).
, kaolinite, and alunite--collected using
It is more common in the industry to obtain boric acid from colemanite or ulexite
by reaction with sulfuric acid.
It has been experimentally observed that the rate of dissolution of minerals increases with the addition of perchloric acid in ulexite
which is considered as one of the most common boron-containing minerals .
It occurs in ulexite
crystals; also known as 'television rock'.
Boron fertilisers in the form of very soluble B compounds such as sodium borate or borax ([Na.sub.2][B.sub.4][O.sub.7] x 10[H.sub.2]O) and boric acid ([H.sub.3]B[O.sub.3]) and less soluble B sources such as colemanite ([Ca.sub.2][B.sub.6][O.sub.11]] x 5[H.sub.2]0) and ulexite
(NaCa[B.sub.5][O.sub.9] x 8[H.sub.2]O) have been added to soil to maintain plant growth (Wear and Wilson 1954).
Demirkiran, Dissolution kinetics of ulexite
in ammonium nitrate solutions, Hydrometallurgy, 95(2009), No.34.
Gerstley borate is composed of ulexite
([Na.sub.2]O 2CaO 5[B.sub.2][O.sub.3]3 16 [H.sub.2]O), with small amounts of colemanite (2CaO 3[B.sub.2][O.sub.3] 5[H.sub.2]O) and probertite ([Na.sub.2]O) 2CaO 5[B.sub.2] [O.sub.3] 10 [H.sub.2]O), resulting in low levels of pore water and much higher levels of chemically bound water.
(2005) como estadistica estocastica para analizar concentraciones de ulexite
en una mina de sal, a tajo abierto, en Bolivia.
Among these minerals are commercially important ones: tincal ([Na.sub.2][B.sub.4][O.sub.7] x 10[H.sub.2]O), colemanite ([Ca.sub.2][B.sub.6][O.sub.11] x 5[H.sub.2]O), and ulexite
(NaCa[B.sub.5][O.sub.9] x 8[H.sub.2]O) [10,11].