H_2O_2和Na_2SO_4晶种对高硫种分母液强化排盐的影响

研究添加Na_2SO_4晶种及H_2O_2对高硫种分母液蒸发排盐的影响及机理。结果表明,H_2O_2或Na_2SO_4的添加能促进母液排盐,且随其添加量增加,碳酸钠、硫盐的析出率及总排盐率均增加。当添加4.5g/L的Na_2SO_4晶种时,排盐率增加至73%;添加6mL H_2O_2时,母液排盐率为67.96%,相比未添加时增加了8.73个百分点;复合添加6mL H_2O_2和4.5g/L Na_2SO_4晶种时,排盐率达到78.26%,且溶液黏度降低明显,NaAlO_2的析出率降低。与原液排盐渣相比,添加Na_2SO_4晶种或H_2O_2排盐渣有Na_6CO_3(SO_4)_2复盐的析出,且排盐渣成分变化较大。

Effects of H2O2 and Na2SO4 Seed on Enhanced Salt Discharge of High-Sulfur Seeded Precipitation Spent Liquor from Seed Precipitation

Effect and mechanism of Na2SO4 seed and H2O2 addition on enhanced salt discharge of evaporation of high-sulfur seeded precipitation spent liquor were investigated. The results show that salts discharging can be promoted by adding H2O2 and Na2SO4. Salting-out rate of sodium carbonate and sulfosalt rises with increase of adding volume of H2O2 and Na2SO4. Brine rate of high-sulfur seeded precipitation spent liquor rises to 73% with addition of 4.5g/L Na2SO4. Brine rate high-sulfur seeded precipitation spent liquor rises from 59.23% to 67.96% with addition of 6 mL H2O2. Upon adding 4.5 g/L Na2SO4 together with 6 mL H2O2 into solution, brine rate is 78.26%, viscosity of solution drops obviously, and salting-out rate of NaAlO2 also drops. Compared with salt residue from original solution, Na6CO3(SO4)2 is separated from salt residue with addition of Na2SO4 or and H2O2, and composition of salt residue changes greatly.