Abstract
Boron ores are used in the production of various boron compounds. One of the most important of them is borax obtained from tincal. During borax production a large quantity of the boron oxide (B 2O 3) is lost with the reactor waste. Also, this waste causes different environmental problems when it discharged directly to the environment. In this study, the evaluation of the reactor waste in borax production was investigated to recover B 2O 3 and therefore to reduce the toxic effect of the waste. For this purpose, the reactor waste was leached by SO 2-saturated water. It was found that about 90 % of B 2O 3 in the waste was recovered. In addition, about 80 % of CaO in the waste was dissolved in the leaching solution. A part of the dissolved CaO precipitated as CaSO 3. 1 2 H 2 O and CaSO 4.2H 2O, and the other part remained as Ca(HSO 3) 2 in the solution. It is possible that CaSO 3. 1 2 H 2 O and Ca(HSO 3) 2 can be used in the paper industry and in other some industries.
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