Study On Extracting Arsenic From Fluosilicic Acid Derived From Wet Process Phosphoric Acid

In more or less degree, arsenic can be found in the phosphate ore. Most of arsenic in the phosphate in the wet process phosphoric acid while producing the phosphoric acid, and evaporates in the form of H₃As or H₅As with gaseous SiF₄ during the concentrating process. The arsenic is absorbed by aqueous solution and kept in fluosilicic acid solution. Obviously, the study on arsenic reclaiming from fluosilicic acid solution derived from wet process phosphoric acid is of significance and of practical use.This study introduces a new method which is extracting arsenic from fluosilicic acid by using solvent extraction. The method is a material used in the two separate liquid solution (feed and extraction agent) allocated to different characteristics of the separation process. Solvent extraction from the organic and aqueous phase mutual mixed aqueous phase into the organic phase arsenic, rely on two-phase mass density will be different two-phase separation. This study uses orthogonal design organizations experiments, the agent for extraction and screening process for the extraction of screening; quadratic regression rotation design organizations seeking optimal experimental conditions.Experimental results show that the experimental scope of the study, the equation of the regression coefficients are significant even highly significant.The conditions of optimum corresponding : Extraction temperature : 45℃Extraction time : 12 minCompared extraction: 1:1.1The rate of removal of arsenic under the optimum technology conditions is over 97%.Handle the return of the second rotation design of experimental data, in addition to the forecast rate of arsenic regression equation : y=0.95978 - 0.07035x₁ - 0.05354x₂ - 0.03087x₃ - 0.04872x₁² - 0.05109x₂² -0.00695x₃² -0.01347x₁x₂ - 0.04795x₁x₃ - 0.01483x₂x₃The regressive equation can predict the effects of all factors on the rate of iodine under different conditions and better guide practice.