Research and application of clarification technology for phosphoric acid after removing heavy metals
In response to the problems of difficult clarification and high solid content of phosphoric acid after removing heavy metals in feed-grade phosphoric acid production,the effects of clarifying agent type,additive dosage,clarification temperature,clarification time and addition method of clarifying agents on the clarification of phosphoric acid after removing heavy metals are investigated to obtain the optimal clarification process conditions.The results show that 0.005 0％polyaspartic acid dispersant is added to phosphoric acid at 70 ℃,and after clarification for 60 min,the settling endpoint is reached,the solid content of upper clear liquid is less than 0.14％;The addition of clarifying agents in equal proportion has better effect.After optimizing the production process of the device based on the experimental results,the solid content of the upper clear liquid is decreased by more than 40％,meeting the requirements of the ultrafiltration machine.The acid output is increased by about 30％,and the consumption of clarifying agents is decreased by 6.9％.
phosphoric acid after removing heavy metalsclarificationinfluencing factors
万方数据
维普
