Properties and phase composition of silicate fillers obtained on the basis of different rice husk processing products

Introduction. Utilization of rice husk (RH), a multi-tonnage waste product of agricultural production, is of practical interest as synthesis of wollastonite and diopside-containing fillers on its base has great prospects. Phase composition and properties of these calcium and magnesium silicates (CMS) obtained by the method of solid phase synthesis will depend on the content of amorphous silicon dioxide in the products, their porosity, acid-base properties of surface, and others.

The aim of the research. To evaluate the impact of the method of obtaining silicon dioxide from RH on the properties and phase composition of silicates synthesized on its base.

Materials and methods of the research. In the work, the derivatives of rice husk processing were investigated: rice husk ash obtained in the laboratory conditions at 500 °С and industrial carbonized rice husk. X-ray diffraction quantitative analysis was carried out on the Rigaku SmartLab diffractometer. Specific pore surface was assessed by the method of low-temperature adsorption on the Quantachrome Nova 1200e apparatus. The pH of the aqueous extract of the specimens was evaluated by the combined measuring device solutions “SevenMulti” under the по GOST 21119.3–91. The carbon content was estimated on the element analyzer “CKIS 5E-CHN 2200”.

Results and discussion. Rice husk ash produced in the laboratory conditions at the temperature 500 °С and industrial carbonized RH are substantially different in porosity, while CMS on their base have different phase composition. Considering both derivates of RH, the largest yield of diopside occurs at the excess amount of dolomite. However, when the industrial specimen is used, the composition of obtained silicate also contains wollastonite, apart from diopside, and such CMS is characterized by the increased porosity of structure.

Conclusions. At the application of more porous industrial silicon dioxide synthesized by solid phase method, the silicate contains wollastonite, which is absent in the composition of the final product on the base of rice husk ask obtained in the laboratory conditions. All synthesized silicates contain crystalline silicon dioxides. The higher the content of silicon components in the stock charge, the greater the concentration of silicon dioxides.

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