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Sulphate removal from sodium sulphate-rich brine and recovery of barium as a barium salt mixture
被引：0
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机构：
[1] Vadapalli, Viswanath R.K.
[2] Zvimba, John N.
[3] Mulopo, Jean
[4] Motaung, Solly
来源：
Vadapalli, V.R.K. (vvravikumar@yahoo.com)
|
1600年
/
Bellwether Publishing, Ltd.卷
/
48期
关键词：
Sulphate removal from sodium sulphate-rich brine using barium hydroxide and recovery of the barium salts has been investigated. The sodium sulphate-rich brine treated with different dosages of barium hydroxide to precipitate barium sulphate showed sulphate removal from 13.5 g/L to less than 400 mg/L over 60 min using a barium to sulphate molar ratio of 1.1. The thermal conversion of precipitated barium sulphate to barium sulphide achieved a conversion yield of 85% using coal as both a reducing agent and an energy source. The recovery of a pure mixture of barium salts from barium sulphide;
which involved dissolution of barium sulphide and reaction with ammonium hydroxide resulted in recovery of a mixture of barium carbonate (62%) and barium hydroxide (38%);
which is a critical input raw material for barium salts based acid mine drainage (AMD) desalination technologies. Under alkaline conditions of this barium salt mixture recovery process;
ammonia gas is given off;
while hydrogen sulfide is retained in solution as bisulfide species;
and this provides basis for ammonium hydroxide separation and recovery for reuse;
with hydrogen sulfide also recoverable for further industrial applications such as sulfur production by subsequent stripping. © 2013 Copyright Taylor and Francis Group;
LLC;
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