Syntetic Wollastonite Production from Raw and Tailing Materials

Abstract

In this study, wollastonite was synthesized from domestic raw and tailing materials (diatomite, quartz, silica ferrochrome and calcined marble tailing). The laboratory work essentially consists of characterization of the raw and tailing materials, shaping by dry pressing, heat treatment and characterization of the final products by means of XRD. Experimental studies consist of three steps; In the first step; the mixtures containing calcined marble tailing (CMT) and quartz, CMT and diatomite and CMT and silica ferrochrome was shaped using dry press. In the second step; one part of the shaped samples were fired directly, but the second part of the samples were fired after an autoclaving operation at the following pressures 1.2 and 1.5 atmosphere for 4-8 h. respectively. Firing temperatures were 1000, 1100 and 1200 °C. In the third step; XRD analysis were applied to the heated samples. At the end of the research; synthesis of wollastonite by solid-state reaction of the mixture calcined marble tailing and silica ferrochrome at low temperature, i.e 1000 °C. The best results were obtained from the mixture containing silica ferrochrome and calcined marble tailing. Wollastonite was also synthesized from the other mixtures containing CMT-diatomite and CMTquartz. But the intensity of wollastonite peaks were lower than that of the mixture containing CMTsilica ferrochrome. The patterns of the samples autoclaved prior heat treatment showed higher peak at 2θ = 30° than that of the non-autoclaved samples. Intensity of wollastonite peaks increased with the increasing temperatures.

Синтез Волластонита И Функциональных Материалов На Его Основе С Использованием Отходов: Краткий Обзор

“…Отходы производства мрамора, содержащие преимущественно кальцит, также активно используются для синтеза волластонита. Ученые из Турции [49] в своих исследованиях описывают возможность использования тонкодисперсного мраморного отхода (поставляется мраморным заводом Reis, Афьон, Турция), содержащего кальцит и незначительное количество доломита. Хвосты обжигали при температуре 900 °C, а затем добавляли воду для получения Ca(OH) 2 .…”

Optimization of Mullite-Based Chamotte Production as a Result of Calcination of a Kaolin-Boron Waste Mixture by Response Surface Method and its Usability in Ceramic

“…showed that boron wastes cannot be used directly in tile glaze due to their high expansion coe cients, but boron wastes can be used as glaze material in tile products if a recipe is prepared to reduce the expansion coe cient. In another study on adding boron waste to oor tile masses, it was stated that products with low porosity, high strength values and low water absorption were obtained [17]. Sağlam and Emrullahoğlu [18] investigated the usability of boron waste in hard porcelain as a result of calcination by mixing it with various raw materials.…”

Evaluation of the Performance of Different Types of Fibrous Concretes Produced by Using Wollastonite

“…Wollastonite can be artificially synthesized with different materials. For example, it was produced with eggshell and silica [ 30 ], rice husk ash, silica ferrochrome, diatomite, quartz and calcined marble tailings in the literature [ 14 , 31 ]. Protection of natural wollastonite resources and use of waste material provide a significant advantage for synthetic wollastonite.…”