Manufacturing technique for producing sulfate in borax mother liquor obtained from processing stone of boron-magnesium-iron through method of removing carbocholine

The invention relates to a technology of borax processing, especially to prepn. technology to produce borax mother solution by processing ludwigite (ferroboron) stone with carbon-alkali process. The characteristic is that feed liquid and precipitate are separated by adding precipitating agent into processed and decarbonized feed liquid during the borax producing process, the obtained mother solution is send back to the technology process for producing borax. Used precipitating agents are calcium, calcium hydroxide, barium hydroxide barium carbonate and lead oxide etc., their utilization quatity is 10-100 kg. for 1 cubic metre feed liquid, the processed and decarbonized feed liquid (material pulp, muddy, clear and mother solution) is used to get rid of sulphur, reaction temp. is 20-135 deg.C, the reaction time is 10-60 minutes.