Abstract： The invention discloses a method for preparing sodium metaborate with a sodium perborate byproduct from low-grade ludwigite. The method comprises the following steps: (1) boron ore concentrate powderis obtained through a mineral processing process; (2) sodium hydroxide and water are added according to the mass ratio of the sodium hydroxide to the boron ore concentrate powder to the water of 1:(1-1.2):(3-4); (3) alkaline hydrolysis is performed on the boron ore concentrate powder at the pressure of 0.5-0.6 MPa and the temperature of 155-160 DEG C, a reaction is performed for 2 h, and thereforea sodium metaborate solution is obtained; (4) after the reaction is completed, plate frame filtration is performed, and a crystallization liquid enters a crystallization tank; and plate frame filtration is performed, and a filtrate returns to the crystallization tank; (5) activated carbon is added into the filtrate, the filtrate is subjected to heat exchange and cooling through a heat exchanger,and the obtained filtrate is sent to a material preparing tank in the preparation process of the sodium perborate; and (6) a preparation process of the sodium perborate is performed: finally, materials are mixed according to a ratio after the sodium perborate product is crystallized so to improve the product stability. The method provided by the invention has the advantages of shortening an overall production process and saving a large amount of costs; and impurity removal of the product is more thorough, and the comprehensive utilization rate of the low-grade ludwigite is improved compared with a usual process.
地址： 118103 辽宁省丹东市凤城市********(隐藏)
发明(设计)人： 代英秋 籍延广 况盛阳 周弘强