Obtenção de sílica do resíduo da agroindústria de arroz

Abstract

With the growing demand for food and its production continuous increasing, there is na increased amount of waste produced by agroindustry. Thus, there is a concern of how to manage this waste without generating na elevated environmental impact. Rice is na example of this, it’s demand continues to grow together with population growth and generation of waste. The primary waste product, the shell, is usually burned and the ashes scattered to nourish the soil again. However, this Project is to set up a process which will consume parto f this shell to obtain very purê amorphous sílica without using its ashes, seeking lower emission of gases which contribute to the greenhouse effects of three distinct pretratreatments in obtaining silica, adding too ne of them na them na ultrasound step to observe the behavior of the sample. Compared with standard comercial silica, the results presented high level of purity, with the size of the majority of the particles in the micrometers scale ando f amorphous composition. The samples showed appreciable diferences in the characteristics which can be explained by the materials were subjected to. It was concluded that the washing in the pre-treatment and the addition of the ultrasound step were relevant.