The Zonal Evolution Characteristics Of Minerals In Nanoparticles Of Several Soils

The mineral composition of nanoparticles in different zonal soils is very different.It is very important to study the clay mineral composition of nanoparticles and to reveal the soil forming process and evolution characteristics.In this paper,the soils of the B layer of four different zonal soils(red soil,red soil,yellow cinnamon soil and brown soil)were studied.After separating the particles from 450-2000 and 100-450 nm in the soil,the nano-particles ultrafiltration(25-100 nm)were separated by microwave irradiation.The particles of different particle size were analyzed by means of synchrotron radiation X-ray diffraction(XRD).The composition and composition of the clay particles were studied.Surface characteristics,morphology and so on,to explore the types and combinations of minerals in different sizes of zonal soil.To reveal the zonal mineralization of clay minerals in soil nanoparticles,and to clarify the material evolution characteristics of soil during soil formation.The main conclusions are as follows :(1)From the north to the south,the content of 2: 1 clay minerals in the soil gradually decreased,while the 1: 1 type of clay minerals and iron oxide content gradually increased,and the emergence of gibbsite.Red soil and brick red soil is the main mineral is kaolinite,there are a small amount of illite,brick red soil there are 1.4nm transitional minerals and gibbsite;brown soil and yellow cinnamon main mineral is illite,also contains leeches Stone and kaolinite.(2)With the decrease of soil particle size,the clay minerals in the tested soil showed a tendency to change from 2: 1 to 1: 1.The nanoparticles in the nanoparticles are reduced by 1.4 nm minerals,and the nanoparticles(25-100 nm)of gibbsite and quartz disappear,mainly composed of kaolinite.Yellow cinnamon and brown soil mainly composed of illite,also contains a small amount of kaolinite.(3)With the decrease of soil particle size,the content of Al2O3 and Fe2O3 in the soil particles decreased,the content of SiO2 decreased,the ratio of silicon aluminum and the rate of iron and aluminum decreased,and the freeness of iron increased first and then decreased with the decrease of particle size.In different soil particles with the same particle size,the content of Fe2O3 in the red soil is higher than that of other soils,while that of SiO2 is lower.The ratio of silicon aluminum to silicon black and red soil is lower than that of yellow cinnamon and brown soil.While the degree of iron on the contrary,brick red soil and red soil iron than the yellow cinnamon soil and higher.(4)Soil particles of different particle sizes have different morphologies and properties.Soil particles are mainly spherical,rod-shaped and sheet-like shape.The Zeta values of the red soil and brown soil decreased first and then increased,and the red soil increased first and then decreased,and the yellow cinnamon soil increased.Compared with the same particle size,the Zeta values of brown soil and yellow cinnamon soil were lower than those of red soil and red soil.