Experimental study on optimization of direct-reverse flotation of a phosphate ore by response surface methodology
The contents of P2O5,SiO2 and CaO in a phosphate mine in Yunnan are 18.59％,37.37％,and 27.55％,respectively.It can be seen that this ore belongs to silica-calcareous collophanite.According to the properties and characteristics of this ore,the flotation test was carried out by using the direct-reverse flotation flow.Firstly,the optimal dosage of each reagent was determined by a single factor condition test.On this basis,the response surface methodology was used to further optimize the dosage of three kinds of regulators in positive flotation.Finally,based on the results of the single factor condition test and response surface methodology optimization,closed-circuit flotation test was carried out.The results of the single factor condition test showed that the optimal dosage of Na2CO3,Na2SiO3,YP6-1 in direct flotation,YP6-1 in reverse flotation,modified starch DZ,H2SO4 and H3PO4 were determined to be 3000,1500,2400,600,700,5000,and 4000 g/t,respectively.Under the optimum dosage of these reagents,phosphorus concentrate with P2O5 grade and recovery of 30.19％and 73.06％can be obtained by a direct-reverse flotation.The response surface optimization experiment revealed that the optimal dosages of Na2CO3,Na2SiO3,and modified starch DZ in direct flotation were 3016.15,1986.72,and 877.33 g/t,respectively.Actual flotation tests conducted under these conditions resulted in a concentrate with a P2O5 grade of 30.08％and a recovery of 75.81％,which was found to be in good agreement with the predicted results.Compared with the results of the traditional single factor condition test,the recovery can be increased by 2.75 percentage points while maintaining the same grade by using the response surface methodology.Finally,the closed-circuit flotation test was carried out based on the result of the single factor condition test and response surface optimization.The phosphorus concentrate with P2O5 grade of 32.07％and recovery of 72.83％was obtained,which indicates that a good flotation effect of the refractory fine collophanite has achieved.
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