Effect of ultrasonic treatment on the kinetics of the formation of calcium hydrosilicate from boron-containing technogenic wastes

Гордиенко, П. С.; Yarusova, S. B.; Супонина, А. П.; Sushkov, Yu. V.; Степанова, В. А.

doi:10.1134/s0040579515050061

“…The results from the study of temperature influence on the kinetics of calcium and wollastonite hydrosilicates formation [20][21][22] shown that microwave and autoclave treatment contribute to increasing the yield of the target product (wollastonite) up to 90-99 % (Figure 2).…”

Section: Resultsmentioning

confidence: 99%

Production of Synthetic Wollastonite Using Gypsum Technogenic Raw Materials

Yarusova

¹

,

P.S

²

,

I.Yu.

³

et al. 2020

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1

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The paper analyzes the literature in the field of synthetic wollastonite production using gypsum technogenic raw materials. Using the example of the complex processing of boric acid production wastes the possibility of obtaining synthetic wollastonite at different modes of waste processing is shown. Possible areas of the practical application of the obtained wollastonite are analyzed. Keywords: gypsum technogenic raw materials, borogypsum, wollastonite, technogenic waste, concrete fillers, polymeric composite materials.

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“…Borogypsum is of particular interest because its composition contains both calcium and silicon components in an optimum ratio to obtain wollastonite, and therefore requires no additional sources of raw materials for blending initial mixture. As a result of research work, the kinetic characteristics of ultrasonic, microwave and autoclave synthesis of calcium silicates from borogypsum were analyzed [37]- [39]. Later studies have been conducted on the effect of additives on the basis of wollastonite obtained in autoclaved borogypsum on the functional properties of fine-grained concrete.…”

mentioning

confidence: 99%

Industrial Waste as Raw Material for Producing Synthetic Wollastonite in Russia

Yarusova¹,

Гордиенко²,

Sharma³

et al. 2017

IJESD

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Abstract-In this paper we present the results of analysis of the scientific and technical literature concerning the ways of obtaining wollastonite from various calcium and silicon-containing technogenic wastes accumulated on the territory of the Russian Federation. We proposed a method for producing autoclave needle-like wollastonite from waste of boric acid (borogipsa) containing both calcium and silicon constituents. The phase composition and morphology of the products autoclaving borogipsa were studied. It is found that the initial product has a crystalline phase of unreacted calcium sulfate anhydrous, tobermorite and xonotlite. After firing at 1000 °C, the amorphous calcium hydrosilicates are converted to a crystalline phase of wollastonite triclinic modification. The effect of firing temperature on phase composition and morphology of the compounds obtained by autoclave treatment were described. It is shown that with increase of the firing temperature up to 1200 °C along with a phase change, the composition variation of the particle morphology occurs. It is found that the processing borogipsa to obtain needle-like wollastonite recommended firing temperature should not exceed 1000 °C.

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“…Since As a result of research work, the kinetic characteristics of ultrasonic, microwave and autoclave synthesis of calcium silicates from borogypsum were analyzed [37]- [39]. Later studies have been conducted on the effect of additives on the basis of wollastonite obtained in autoclaved borogypsum on the functional properties of fine-grained concrete.…”

mentioning

confidence: 99%

Industrial Waste as Raw Material for Producing Synthetic Wollastonite in Russia

Yarusova¹,

Гордиенко²,

Sharma³

et al. 2017

IJESD

View full text Add to dashboard Cite

Abstract-In this paper we present the results of analysis of the scientific and technical literature concerning the ways of obtaining wollastonite from various calcium and silicon-containing technogenic wastes accumulated on the territory of the Russian Federation. We proposed a method for producing autoclave needle-like wollastonite from waste of boric acid (borogipsa) containing both calcium and silicon constituents. The phase composition and morphology of the products autoclaving borogipsa were studied. It is found that the initial product has a crystalline phase of unreacted calcium sulfate anhydrous, tobermorite and xonotlite. After firing at 1000 °C, the amorphous calcium hydrosilicates are converted to a crystalline phase of wollastonite triclinic modification. The effect of firing temperature on phase composition and morphology of the compounds obtained by autoclave treatment were described. It is shown that with increase of the firing temperature up to 1200 °C along with a phase change, the composition variation of the particle morphology occurs. It is found that the processing borogipsa to obtain needle-like wollastonite recommended firing temperature should not exceed 1000 °C.

show abstract

Effect of ultrasonic treatment on the kinetics of the formation of calcium hydrosilicate from boron-containing technogenic wastes

Cited by 5 publications

References 5 publications

Production of Synthetic Wollastonite Using Gypsum Technogenic Raw Materials

Production of Synthetic Wollastonite Using Gypsum Technogenic Raw Materials

Industrial Waste as Raw Material for Producing Synthetic Wollastonite in Russia

Industrial Waste as Raw Material for Producing Synthetic Wollastonite in Russia

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