Research On The Adsorption Equilibrium And Dissolvability Of Fulvic Acid In The Process Of Abstract From Weathered Coal

Fulvic acid was applied extensively in industry, agriculture, fishing, medicine, graziery in recent years, but there were some problem such as dissolution of fulvic acid is little and solution concentration is low in the process of preparation of fulvic acid, which result in waste of raw material and increase of coal residual discharge capacity. Rising of abstract rate can reach by the study of dissolvability and adsorption equilibrium (coal residual adsorbs fulvic acid) of fulvic acid. Wherefore, adsorption equilibrium and dissolvability of fulvic acid in the process of abstract from weathered coal were studied in this paper.In this paper, the adsorption of fulvic acid on the weathered coal residual was firstly measured and analyzed by modern technique such as Spectrophotometry, IR, and study means of quantitative research and qualitative analysis; the principles of the Colloid Chemistry, the Physical Chemistry, the Surface Chemistry, the dissolution mechanism of fulvic acid was analyzed; and thetemperature, the medium, the pH value of the solution that affect the equilibrium adsorptive capacity of fulvic acid on the coal residual and dissolvability of fulvic acid were also studied.The research shows that:(l) The equilibrium adsorptive capacity of fulvic acid on the coal residual decreases with the rise of temperature;(2) The equilibrium adsorptive capacity of fulvic acid on the coal residual decreases with the join of media in the solution, but the decrease amplitude is little; (3) Diminishing of the pH value of solution, the equilibrium adsorptive capacity of fulvic acid on the coal residual increases; rising of the pH value, the equilibrium adsorptive capacity decreases;(4) Compared FTIR coal residual in different condition show that the absorptive crests have obvious difference;(5) Fulvic acid occurs gelatinization in the process of dissolution.