High-alumina Waste Research Articles

Investigation of Mullitization in Fused Materials Based on Kaolinite Clay and Production Waste

The results of studies on using a concentrated radiation flux to obtain fused materials based on kaolinite clay and high-alumina waste are reported. The phase composition, microstructure, and elemental composition of the synthesized materials were determined. It was found that the additive content 10 – 20% by weight and melt cooling rate about 103 K/sec are preferable for the formation of the optimal microstructure in the form of mullite needles with different orientations.

Heat-resistant Binders Synthesis with Application of Alumina-containing and High-alumina Waste

The article presents various methods for producing mixed heat-resistant binders able to harden in air at normal temperature. The processes of binders synthesis based on hydraulic cements and inorganic refractory industrial waste: aluminium-chromium petrochemical waste and expanded clay dust are considered to create high-temperature heat-resistant binders and concretes based on them. Light concretes with porous aggregates are offered to obtain a highly porous refractory material of air hardening.

Perspective raw materials of Uzbekistan for the production of refractory materials

The results of studies of promising raw material resources of Uzbekistan (enriched kaolins, bauxite-like rock, highalumina waste from the gas processing industry) to obtain high-alumina aggregates are presented. It is established that these raw materials in terms of their physico-chemical indicators meet the requirements for aluminosilicate and high-alumina materials used in metallurgical units. Ref. 13. Tab. 3.

Hydrothermal Treatment Management of High Alumina Waste for Synthesis of Nanomaterials with New Morphologies

Kiln rollers’ grind waste powders (KRGW) collected from a ceramic factory are considered a high alumina waste consisting of several phases. The KRGW was treated hydrothermally at 150°C for different time periods. The hydrothermal method was found to be a very effective method for the management of KRGW in synthesizing new nanomaterials with new morphologies. Raw and treated kiln rollers’ grind waste was characterized using XRF, XRD, TEM, BET, DTA, and TGA. TEM of the raw KRGW showed a lamellar crystal structure with different shapes and morphologies. XRD displayed hour different phases with a high percentage of mullite and corundum due to the high levels of Al and Si in the raw waste. Treated KRGW exhibited nano-sieves with different morphologies consisting of two predominant phases, namely calcium aluminum oxide and corundum. Results indicated that the hydrothermal process assists phase changes, crystal size, and morphology of the KRGW. This modification is expected to improve over all properties of KRGW for efficient practical applications.

Ecological and practical aspects of the use of petrochemical waste in the production of refractory heat insulation material based on water glass

It is established that petrochemical high-alumina waste may be used in the production of refractory heat insulation materials based on water glass. The refractoriness of heat insulation materials is considerably increased.

Ecological and practical aspects of the use of high-alumina petrochemical waste products in the production of acid-resistant materials

It is established that it is desirable to use petrochemical high-alumina waste products as a shortening material instead of chamotte in the production of acid-resistant materials. This promotes a significant improvement in the physicomechanical and chemical properties of acid-resistant materials.

Synthesis of heat-resistant glass crystal coatings using high-alumina waste

The results of synthesis and physical-chemical investigations of heat-resistant glass ceramic coatings, which are intended for use as high-temperature corrosion protection for nichrome alloys, using high-alumina waste from the metallurgical industry are presented. The mechanism of sitallization of the glass matrix of the coating as well as the phase composition of the heat-resistant coatings and the nichrome – coating contact layers are determined as functions of the ratio of the bonding activators—NiO and CoO.

Effects of Waste Composition and Loading on the Chemical Durability of a Borosilicate Glass

ABSTRACTThe effects of waste composition and percent loading in a borosilicate glass designed for US defense high level wastes (HLW) have been evaluated. Three types of simulated wastes were investigated; high alumina, high iron and a composite representative of an average waste composition from Savannah River Plant (SRP) waste tanks. Corrosion resistance of the borosilicate glass is significantly enhanced by the presence of any of the three types of wastes. Additionally, corrosion resistance is improved as the % waste loading is increased in the glass. The best corrosion performance was obtained with the high alumina waste in deionized water.