30 results about "Potassium product" patented technology

The invention discloses a method for preparing food grade potassium dihydrogen phosphate by using industrial wet-process purified phosphoric acid. The method comprises the following steps: (1) addingwater for dilution: placing industrial wet-process purified phosphoric acid in an acid-resistant container, adding pure water, and performing stirring for diluting; (2) performing a neutralizing reaction and removing fluorine and sulfur: adding a fluorine and sulfur removing agent and potassium hydroxide, carrying out stirring for reacting, and performing membrane filtration to obtain a preciselyfiltered neutralizing solution; (3) performing oxidative dearsenification, slightly alkaline heavy metal removal and membrane filtration: adjusting the pH of the neutralizing solution to be slightly alkaline, adding an oxidant, and performing heating, cooling and membrane filtration to obtain a precisely filtered slightly alkaline heavy metal removal and dearsenification solution; (4) performing pH value adjustment and concentration: adjusting the pH value with phosphoric acid and performing concentrating to obtain a potassium dihydrogen phosphate concentrated solution; (5) performing coolingand crystallizing: transferring the concentrated solution into a crystallizing device, and performing stirring, cooling, crystallizing, and solid-liquid separation to obtain potassium dihydrogen phosphate wet crystals; and (6) drying the wet crystals: drying the wet crystals until a water content required by the product to obtain the food-grade potassium dihydrogen phosphate product. The method has the advantages of easy implementation, low cost, high purity and sufficient removal of arsenic and heavy metal ions, and the prepared food grade potassium dihydrogen phosphate has good dissolution performance.