绿色矿冶

Hydroxamic acid plays a very important role in improving concentrate grade in bauxite flotation. In this paper, the influencing factors of the synthesis process of benzohydroxamic acid were discussed. The synthesis process of benzohydroxamic acid was optimized by adjusting the proportion of material addition, optimizing the cooling system and prolonging the reaction time. After optimization, the content of benzohydroxamic acid is increased, and the dosage of hydroxylamine hydrochloride is also reduced by about 17 %, which not only reduces the production cost, improves the working environment, but also significantly improves the beneficiation index. Because the raw materials for the synthesis of hydroxylamine hydrochloride are highly toxic, and the synthesis rate is low and the price is high, the feasibility of replacing hydroxylamine hydrochloride with hydroxylamine sulfate was discussed, and the process of synthesizing benzohydroxamic acid from hydroxylamine sulfate was optimized. The results show that the index of benzohydroxamic acid produced by hydroxylamine sulfate meets the standard and meets the needs of bauxite beneficiation. It can replace hydroxylamine hydrochloride to synthesize benzohydroxamic acid, alleviate the product tension and reduce the production cost.