Cleaner production in the ammonia–soda industry: an ecological and economic study

Five methods to reduce the negative influence of soda ash factories on the natural environment are presented: aining calcium–magnesium phosphates by treating the suspension from raw brine purification with orthophosphoric acid (H3PO4), duction of precipitated chalk from soda processing waste, duction of gypsum and semi-brine, ulphurisation of fume gases from the factory power plant, lization of distiller waste. sts, accomplished on a laboratory scale, showed the high efficiency of these methods. Economic analysis has proved that only four out of the five presented processes can have a positive financial effect on soda ash factories, as well as being well justified economically. The value of two of the innovations presented is confirmed by their implementation in factories.