Physical Properties and Chemical Composition of the Rice Husk and Dust

Abstract

The paper deals with the physical properties and chemical composition of rice husk and dust, which are the waste of the Regulus raw rice growing in the Krasnodar Region of the Russian Federation. Rice dust is formed as a result of the discharge upon the receipt of raw rice from vehicles, removal of impurities, sorting by size, during separation of membranes, crushing, grinding, polishing, moving grain along the elevators and conveyors, i.e. during all technological operations production of rice groats. In order to remove dust, the group cyclone and the bag filter-cyclone are installed in the pneumatic conveying systems and suction plants of "Southern Rice Company", LLC. The paper shows the chemical composition of samples of husk, dust retained by the group cyclone, and dust retained by the bag filter-cyclone. Rice husk contains a significant amount of silicon dioxide -14.8%. The dust collected from the group cyclone contains ferrum (109 mg/kg), plumbum (1.1 ± 0.4 mg/kg), and copper (1.2 ± 0.4 mg/kg). The bag filter-cyclone retains finer dust particles. The dust collected in the cyclone is of yellowish-pink color, and the dust, collected from a bag filter-cyclone, is gray. Fine dust, which has passed through the filter, is drier than the dust, segregated in a cyclone, so it is more explosive and easily ignited. Dust can cause the explosion. The dust properties give an indication of the degree of its danger and the ability to form explosive concentrations in air.

Characterization and adsorptive behaviour of snail shell-rice husk (SS-RH) calcined particles (CPs) towards cationic dye

“…Changes in the respective weight of the active mixed metal oxides after adsorption revealed their positive influence on the BGD adsorption on the active sites of calcined SS-RH particles. A study also revealed silicon and calcium composition to be 32.2 and 10.21 wt% whose sources were from rice husk and snail shell respectively (Korotkova et al., 2016). Reduction in wt% of active oxides of Si, Al and S in the calcined SS-RH particles suggested their strong affinity to adsorb BGD from aqueous solution.…”

Synthesis of composite snail shell‐rice husk adsorbent for brilliant green dye uptake from aqueous solution: Optimization and characterization

“…Exhibit b revealed the positive influence of the active mixed metal oxides on the BGD adsorption as a result of changes in their respective weight percents after adsorption. Similar studies have also revealed larger compositions of 32.2 and 10.21 weight percent for silicon and calcium to be originated from the rice husk and snail shell, respectively (Korotkova, Ksandopulo, Donenko, Bushumov, & Danilchenko, ). Reduction in weight percent of the active oxides of Si, Al, and S in the SS‐RH composite adsorbent revealed their strong affinity to adsorb BGD from an aqueous solution.…”

Nano-magnetic walnut shell-rice husk for Cd(II) sorption: design and optimization using artificial intelligence and design expert

“…The result of energy dispersive spectroscopy analysis showing elemental weight percent of adsorbent before and after Cd(II) adsorption from aqueous is presented in Table 7. The larger weight percent of calcium (13.21%) and silicon (21.20%) could be traced to walnut shell and rice husk respectively (Korotkova et al., 2016) while presence of iron (38.85%) is a strong evidence of their magnetization before Cd(II) adsorption. The following observations are strong evidence of Cd(II) sorption onto NM-WS-RH-AC (1) changes in the weight percent of adsorbent elemental composition (Popoola, 2019) (2) reduction in oxygen and hydrogen content implies H + and OH − reaction has occurred on adsorbent surface and (3) presence of cadmium in the adsorbent (found missing before adsorption) after adsorption.…”