The Characteristics And Development Of Guangxi Illite Clay Mineral Study

Clay mineral resource is abundant and widely distributed. It is a silicate mineral sand with great potential and has been widely used in many fields for its excellent physical and chemical properties of better adsorption and ion exchange. Guangxi illite clay mineral resource is very rich. But its application is greatly limited due to its complex composition and the monomer dissociation cannot be reached through the mineral separation process. The purpose of this paper is to look for suitable application fields and broaden it, confirm technical solutions of processing, improve the industrial application value according to its properties.This paper systematically studied the mineralogical characteristics of illite clay mineral. Based on this, the first, the paper researchs the mineral surface modification technology and reagent system, the vulcanization conditions and sulfide recipe of illite clay mineral reinforced NR/SBR composites.Study the modification and reinforcement mechanism of illite clay mineral, analyze the composite structures, stretching section morphology and thermal stability by using test methods of infrared spectroscopic analysis, scanning electron microscope and TG-DTA.Then the paper discusses the use of illite clay mineral in dye wastewater, and do curve fitting according to the illite clay mineral spherulite decolorization adsorption model. The experiment results show that:(1) The main chemical composition of Guangxi illite clay mineral are SiO260.36%、Al2O322.47%、K2O3.10%、Fe2O33.63%. And it mainly consists of illite, quartz, montmorillonite and kaolinite, a small amount of chlorite. Illite, kaolinite, montmorillonite and chlorite are schistose structure, and directional distributed. The granular quartz is wrapped in sheet structure, and has a large number of micropore developments. It is too difficult to get the monomer dissociation through the mineral separation process for the complicated mineral composition, fine particle size distribution of clay mineral and quartz. Therefore, it can only base on the mineral characteristics to find its application fields.(2) The best modification condition of Guangxi illite clay mineral reinforced NR/SBR blend system are R12%, R22%, R31%, main modified agent Z41%and auxiliary modified agent Q12%.The modification time is15min and temperature is90℃. Suitable sulfide recipe is ZnO5.0phr, stearic acid2.0phr, antioxidant BHT l.Ophr, accelerator c1.2phr, b0.8phr, d1.1phr,40phr filler,1.0phr of sulfur. The vulcanizing temperature is145℃and time is15min. The tensile strength of the composite reach12.79MPa, with29.26MPa tear strength,582.12%elongation,3.75MPa tensile stress,60HA hardness. It meets the National Standard requirement of non load vehicle tires, pneumatic tires, agricultural tyre cushion belt and the sole and heel of soft shoes.(3) FT-IR analysis shows that S got cross linking reaction with rubber’s carbon chain then formed C-Sx-C during sulfidation. silane coupling agent has played a bridge role when illite clay combined with rubber reaction, and can promote the chemical bonding of clay and rubber matrix. Therefore, the modified illite clay minerals has a good reinforcing effect on composite materials. SEM analysis shows that, the natural rubber has a good compatibility with styrene butadiene rubber. The fracture surface of blank vulcanized rubber is smooth but has poor mechanical properties. Illite clay modified illite and montmorillonite clay are evenly dispersed on rubber matrix whose scale is closely integrated with the rubber directional arrayed and embedded without obvious contact interface which largely improve the physical and mechanical properties of composite. But the quartz particles lead to a large number of grooves appearing on the rubber section and affect the overall reinforcing effect of illite clay. In addition, the smaller the mineral particle, the better dispersity modified illite clay on rubber matrix, the better reinforcement effect.(4) TG-DSC analysis shows that, the thermal stability of rubber has a significantly improvement after composite materials filled in modified illite clay mineral. The main reason is that the chemical bonding of clay minerals (illite, montmorillonite,etc.) and composite and cross-links between the rubber molecules and lamellar structure which embedded in the rubber matrix to form an effective block unit which make the thermal decomposition of composite more slowly and complicated so as to improve the adiabatic capability and thermal stability of composite material effectively.(5) Illite clay mineral has microporous development, good hygroscopicity, a significant decolorizing effect for cationic dye wastewater. The adsorption decolorization rate of200mg clay mineral powder reacting on100mL methylene blue solution (5mg/L) can be higher than95%. The granulation adsorption effect is also good. Illite clay spherulite can decolorize and adsorb for a long time for150g clay spherulite need8-10days before saturation adsorption, therefore has a certain value in industrial application.(6) Illite clay mineral powder has good adsorption effect on decolorization of methylene blue solution, the adsorption is mainly physical adsorption. The spherulite surface of illite clay mineral has many pore, large superficial area, good adsorption effect. Spherulite has three function during the adsorption process, one is the adsorption of microporous structure acting on dye molecules; two is the adsorption of clay mineral constituent like montmorillonite existing in illite clay minerals; three is the adsorption of a mass of gap which exist in the internal structure of illite clay mineral acting on dye molecules. Through the model fitting we know that for the adsorption of illite clay mineral spherulite acting on cationic dye, physisorptions is primary, chemisorption is complementary.(7) The experimental study shows that, the Guangxi illite clay mineral can be better applied to the rubber filler and dye wastewater decolorization adsorption field. But further studies are needed for its development and utilization because of the ore composition complex. Especially in the rubber filler applications, there are still large space for development and utilization of its modification process and formula, curing formulations and filled grain size.