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芬兰奥托昆普公司研究所研制成一种净化含酸污水的新方法,用以代替石灰,中和处理污水。新方法是把废液与硫酸混匀和氟酸及硝酸蒸馏。溶液中含有的金属以硫酸盐形态沉淀。蒸馏用真空蒸发器,在温度80℃下和H_2SO_4含量为60_70％条件下进行,然后使HF和HNO_3凝缩,金属硫酸盐进入结晶器内。从结晶器内引出的泥浆被送入浓缩机。浓缩机的大部分溢流返回真空蒸发器,而其余一部分溢流进入浸水式蒸发器。在温度170℃下浸水式蒸发器内的H_2SO_4含量可增长到80％。废气在温杜利式洗涤塔内冷却。
The Outokumpu Institute of Finland has developed a new method of purifying acid-containing wastewater to replace lime and neutralize sewage. The new method is to waste and sulfuric acid mixing and hydrofluoric acid and nitric acid distillation. The metals contained in the solution precipitate in the sulphate form. Distillation with a vacuum evaporator at a temperature of 80 ° C and H_2SO_4 content of 60_70% under the conditions, and then HF and HNO_3 condensation, metal sulfate into the mold. The slurry from the mold is sent to the thickener. Most of the thickener is returned to the vacuum evaporator, while the remaining part overflows into the soaking evaporator. H 2 SO 4 content in the soaking evaporator can increase to 80% at a temperature of 170 ° C. The exhaust gas is cooled down in a Venturi scrubber.