Optimization of Silicon Fertilizer Preparation from High Silicon Iron Tailings Using Response Surface Methodology
To solve the environmental pollution problem caused by the accumulation of iron tailings,silicon fertilizer was prepared from high silicon iron tailings by hydrothermal-alkali dissolution reaction under the conditions of alkaline mixture of sodium hydroxide and calcium containing activator SF.The response surface method designed by Box Behnken was used to establish a relevant model for optimization experiments.The effects of reaction temperature(A),reaction time(B),m(SF)/m(raw ore)(C),and m(NaOH)/m(SF)(D)on the effective silicon content in silicon fertilizer were investigated.The results showed that the significant effects of each factor on the effective silicon content were B＞D＞A＞C,and the significance of interaction between each factor was AD＞CD＞AC＞BC.Under the conditions of temperature of 169.83℃,reaction time of 2.54 h,m(SF)/m(raw ore)of 0.98,and m(NaOH)/m(SF)of 0.77,the effective silicon content reached 31.01%.This method has the advantages of low processing temperature,short reaction time,and simple preparation process,and can explore the potential utilization value of iron tailings.
iron tailingshydrothermal methodsilicon fertilizerhydrothermal-alkali dissolution technologyresponse surface method
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维普
