This These results suggest that boric acid can be

article offers an alternative solution for the exploitation of the colemanite
process waste (CPW).   The sample is beneficiated
by scrubbing in the first step, and the scrubbed sample is enriched by leaching
in the second stage.        In colemanite
recovery from colemanite process waste (CPW) by the scrubbing method, results
indicated that the boron oxide grade of the sample was enhanced from 29.17 % to
40.72 % B2O3. Colemanite concentrate (CC) was obtained
from CPW by scrubbing.

            When the
leaching of colemanite concentrate (CC) in sulfuric acid solutions was studied
in a batch reactor, the results showed that the dissolution efficiency
increased with increasing reaction temperature and decreasing solid-to-liquid
ratio. The most important parameter for the dissolution efficiency was found to
be the reaction temperature, while the least important parameter was found to
be the stirring speed.                        In order to obtain pure boric acid
crystals, no crystals of gypsum should form in the filtration liquid phase. It
was found in this study that at least 120 minutes of dissolution time was
needed for gypsum crystallization to be completed. It was revealed that the
speed of gypsum crystallization was much slower than the speed of dissolution
of CC.          The optimum conditions were found to be a solid-to-liquid ratio of 50
g/L, a stirring speed of 500 rpm, an acid concentration of 1 mol/L, a
temperature of 70 oC and a time period of 120 minutes. Maximum
boron oxide extraction efficiency was 99.99%.

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purity boric acid crystals were obtained from colemanite process waste (CPW) by
scrubbing and leaching. These results suggest that boric acid can be produced
commercially from colemanite process waste (CPW). In this way, environmental
problems from colemanite process waste will be reduced and the waste will gain
an economic value. Boric acid has a great deal of utility as a raw material in
various industries. Moreover, commercially boric acid, price of 700 USD/tons 20, was sold as