Study On Activation Mechanism And Its Appliance Of Nutrition Component Of Potassium-bearing Rocks

China is a country which is short of solubility potassium ore resource.The nutrient proportion(N:P₂O:K₂O)Of fertilizer which have been consumed is equivalent to 1:0.42: 0.42 in the world,but 1:0.40:0.16 only in china.With change of plant structures and development of cash crops,China will require more Potassium fertilizer.As for intelligent use of fertilizer,the potassic fertilizer is a choke point in China.In order to resolve the problem of potassic fertilizer by self-supporting manner in some sense,the best method is to utilize rich-in potassium rock fully..The key of all component of potassium-bearing rocks used for farming is to improve product's content of active ingredient and make leavings of silicon-potassium fertilizer have a geochemical activity.The structure change of potassium silicate mineral has been studied and represented on roast condition.Transformation relationship and condition among minerals were carried out. The XRD,IR of the product and content change of active ingredient showed that roasting rich-in- potassium rock alone can not become silicon-potassium fertilizer for reasons of low content of active ingredient,in spite of change of their mineral structure.In order to make potassium-feldspar and iolite turn into citrate-soluble(or water—soluble)mineral, potassium-feldspar and illite must mix with accesary material and mineralize.Analysis of phase diagram and thermodynamics calculation have been made for the formula of predetermined clinker minerals,the dynamics experiment having carried out on the key elements(the temperature,material size,insulating time and content of mineralize) affecting reaction velocity.The author has suggested for the first time batch formula theory building on glass network structure concept basis.The upshots of batch theory are that intrasystem oxides was divided into network-forming oxide,network-modifying oxide and network-finishing oxide according to their property,and batch was computed according to quantitative rate(mode number)of network-forming oxide,network-modifying oxide and network-finishing oxide.The research indicated that the mode number has an obvious corresponding relation with roasting temperature,at the same time,mode number can be used for representing network structure's extent of depolymerization of Vitreous product, correlated coefficient R=0.8995.However,acid dissolution experiment showed that mode number has a good correspondence with dissolution ratio(total content of active ingredient), correlated coefficient n=0.9792.This batch theory has provided a basic scheme for increase of active ingredient content and worked out a engineering procedure.The chemistry behavior research of wollastonite indicated that the silicon-potassium fertilizer has a chemical active in organic acid.The factors affecting manurial effect of silicon-potassium fertilizer are not only soil pH and desilicification,but also content and type of organ in the soil.Wollastonite chemistry behavior indicates that silicic acid can be dissolved out from silicon-potassium fertilizer in chlorhydric acid solution if pH of solution is not smaller than 2. The drop of apparent density,increase of DBP sorptive rate and specific surface for leavings indicate that hydrated silicon oxide is polyporous,and those mineralogic feature presignify that silicon-potassium fertilizer has a role of conservation of both Moisture and Fertility and improving soil structure.After active ingredient releasing,silicon-potassium fertilizer leaves half the substance (non-active ingredient)in soil.Leavings of silicon-potassium fertilizer,which anagenetic minerals are montmorillonite,heulandite,gismondite and amorphous substance,were obtained in simulative circumstance of radical.The adsorption mechanism and effect of pH on Cd²⁺adsorption were studied.Being affected by amorphous SiO₂,when pH value is more than 7,Cd²⁺adsorption come down obviously;the Cd²⁺adsorption equilibrium on leavings can be described in terms of Langmuir isotherm,the kinetic of Cd²⁺on leavings fit second order kinetic model.The adsorption process is controlled by pore diffusion and the effective coefficient were 8.95×10^-12cm²Â·s^-1.â–³G is -1.203～-1.554(kJ·mol^-1)at the experiment temperature(25～61℃),â–³S is 7.8(J·mol^-1·k^-1),â–³H is 872.1(J·mol^-1),which indicates that the adsorption process is endothermic.The research is not only directive significance in practicality for the development of rich-in-potassium rock,but also importance significance for the reassessment of affecting soil structure in long-term application of silicon-potassium fertilizer.