Analysis of the properties of heat insulation materials based on Tatar deposit vermiculite

Abstract

Development of a new lining material with high chemical and deformation resistance based on vermiculite is described. Properties of the objects obtained are provided that are not surpassed by overseas analogs. This achievement is due to the use of a rational combination of raw material properties and technology regime parameters. In efficiency, material based on vermiculite may replace diatomite materials used traditionally. Use of objects based on vermiculite, having a density lower by a factor of three and lower thermal conductivity by a factor of six instead of traditional heat insulation material, i.e. chamotte, opens the possibility of a reduction in material content. The higher deformation resistance of the material promotes an increase in electrolyzer service life. Therefore, objects based on vermiculite may be used successfully for heat insulation not only in non-ferrous metallurgy installations, but also in thermal power engineering equipment, and in the construction of objects for industrial and domestic purposes.

Expanded Vermiculite/Paraffin Composite as a Solar Thermal Energy Storage Material

“…The thermal conductivity of pristine vermiculite was measured as 0.106 W·(m·K) −1 , similar to the reported value . Pristine vermiculite was expanded and EVM then mixed with paraffin to prepare the composite.…”

“…The size of phlogopite was less than 1.0 mm. Phlogopite dispersed in paraffin was in a disorientated state, as suggested previously . Phlogopite could supply a path for the heat transfer of paraffin, resulting in the enhanced thermal conductivity of the composite compared with that of paraffin.…”

“…When heat flow through vermiculite is perpendicular to the grain jointing planes, the thermal conductivity is much lower than that of EVM‐containing disorientated cubic grains. However, this is only so for coarse‐grained vermiculite, as EVM grains (<1.0 mm in size) exhibit little orientation . Composite materials of the later exhibited intermediate thermal conductivity between λ ‖ and λ ⊥ , as suggested by Karaipekli and Sarı …”

Production of molded refractory products based on zeolite-containing rocks and high-modulus polysilicates

“…Разрабатываемый способ позволяет получать формованные огнеупорные изделия на основе цеолитсодержащих пород и высокомодульных полисиликатов. Известны аналогичные огнеупорные материалы, например, пористый огнеупорный материал на основе аморфного кремнезема и алюминиевой пудры [7], футеровочный материал на основе диатомита, каолина и извести [8,9], высокотемпературные теплоизолирующие материалы на основе вермикулита [10]. Аналогичные шамотные легковесные огнеупоры изготавливают из первичных каолинов [11].…”