Mathematical model of separation and washing process of aluminum hydroxide and its application
Based on the principles of solute conservation and mass conservation,it is assumed that the washing process is at a constant temperature(the temperature parameter of the washing process is all taken as characteristic temperature).A mathematical model for the separation and washing of alumi-num hydroxide at pan filter is established,and a specific algorithm is provided.Simulation calculations are conducted on the actual production situation,and parameters such as flow rate,density and total alkali concentration of the adherent liquor and filtrate of each washing filter cake are solved.According to the principle of heat conservation,the temperature after each washing is calculated based on the aforementioned calculation results,and then the char-acteristic temperature is corrected.After multiple iterations,the characteristic temperature can converge.By changing the amount of washing water added,the total alkali concentration(g/L)of the three washing filter cake,pan filter adherent alkali(％)and washable alkali content(％)of finished alumina were analyzed and calculated under different washing water consumption conditions.The calculation results show that with an increase in the amount of washing water added,the total alkali content in the adherent liquor of the three washing filter cake,the pan filter adherent alkali and the washable alkali content in the finished product all show a downward trend,but the decline rate becomes slower and slower;By simply increasing the amount of washing water added,the reduction in alkali content in the finished product is limited.
pan filterseparation and washing processmathematical modelwashable alkali content
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