Study of Effect Factors in Boric Acid Preparation by Borax Acidification

By comparing with boric acid production by borax acidification experiments using sulfuric acid and hydrochloric acid respectively,the effects on the crystallization of boric acid,such as acid varieties,acidity of solution,neutralization temperature,crystallization temperature,solid-liquid ratio of reaction,temperature reducing method,stirring speed and so on,were studied.The experiment condition for borax acidification was optimized,and the purity of obtained boric acid can reach 99.7%,and even 99.9% after further recrystallization.This technique provided reference conditions for production of high purity boric acid.And environment pollution was reduced by recycling mother solution.By-product sodium salt can be refined or produce boric fertilizer,increasing the recovery rate of boric acid and fully utilizing the boron resources.