Recovery of silica from rice straw and husk

Abstract

Rice straw and husk are the major by-products of cultivation of rice, which is the second leading agricultural crop after corn. The open field burning of rice straw and husk is gradually being replaced by the recovery and utilization of these resources. For this purpose, silica recovery from rice residues is one of the main options. Different technologies are being developed for silica production from rice straw and husk. In this chapter, various techniques are categorized and reviewed within a platform to explain most existing methods. In addition, the most important characteristics of the recovered silica and their relation to the operational conditions as well as the applications of the produced silica are presented. © 2020 Elsevier B.V. All rights reserved.