Assessment of Super-gravity Concentrating V-containing Spinel Phase from Vanadium Slag

AbstractA new approach to concentrate V-containing spinel phase from vanadium slag by super gravity was investigated. The samples obtained by the gravity coefficient G ≥ 1050, time t ≥ 30 min and temperature T ≥ 1523 K appear significant layers and V-containing spinel phase presents gradient size distribution in the sample along the super gravity. The mechanism of moving speed of V-containing spinel particles in super gravity field was also discussed, and the conclusion indicates that the moving speed of V-containing spinel particles is proportional to the square of the V-containing spinel particle size. As a result, large size V-containing spinel particles move a farther distance than the small ones and gather at the bottom of the sample. Under the hypothesis that the vanadium and silicon exist in the slag in terms of V

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Laboratory Studies of the Heat-Insulating Properties of the Panels that Made of Recycled Rubber

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.864.66 ◽

2020 ◽

Vol 864 ◽

pp. 66-72

Author(s):

Andelko Crnoja ◽

Vladimir Kersh ◽

Oleg Popov ◽

Alina Dovhulia

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Large Size ◽

Heat Insulator ◽

Small Grains ◽

Properties Of Materials ◽

Recycled Rubber ◽

Heat Shielding ◽

Insulating Properties

This study examines the thermal insulation properties of panels made from recycled rubber. The reasons, in addition to the use in construction, are environmental protection, sustainable development, energy conservation. The thermal conductivity coefficient λ is the main characteristic, on the basis of which a decision is made on the choice of material as a heat insulator. Materials with λ <0.2 W / (m · K) are heat-insulating. Tested 3 composition of the material of different particle size distribution. It is shown that the key parameters that determine the heat-shielding properties of a material are its density and particle size distribution. It has been confirmed that with decreasing density the insulating properties of materials are improved. Compositions consisting of small grains have the best heat-insulating properties. After samples with grains of small size, in order of deterioration, samples of grains of large size and, finally, samples of mixed particle size distribution follow. The results also showed that the amount of binder in this case is negligible (4.2-7.5%) and practically does not affect the insulating properties of the material. Abstract: This study discusses the thermal insulation properties of panels made from recycled rubber. The reasons, in addition to the use in construction, are environmental protection, sustainable development, energy conservation. The thermal conductivity coefficient λ is the main characteristic, on the basis of which a decision is made on the choice of material as a heat insulator. Materials with λ <0.2 W / (m · K) are heat-insulating. Tested 3 composition of the material of different particle size distribution. It is shown that the key parameters that determine the heat-shielding properties of a material are its density and particle size distribution. It has been confirmed that with decreasing density the insulating properties of materials are improved. Compositions consisting of small grains have the best heat-insulating properties. After samples with grains of small size, in order of deterioration, samples of grains of large size and, finally, samples of mixed particle size distribution follow. The results also showed that the amount of binder in this case is negligible (4.2-7.5%) and practically does not affect the insulating properties of the material.

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