反应详情

reacting the sodium tungstate in the liquor with the calcium carbonate at a temperature of at least about 130° C. to form sodium carbonate and solid calcium tungstate, while providing sufficient carbon dioxide overpressure to the slurry to convert sodium carbonate in the slurry to sodium bicarbonate and thereby promote the conversion of sodium tungstate to calcium tungstate, thereby forming a product slurry containing a sodium bicarbonate liquor and a solid calcium tungstate concentrate which can be recovered from the product slurry, and,

1. customof at least about 130° C.