Microscopic researches of Modified aluminа cement clinker

Abstract

Nowadays, the problem of resource serving is a topical. For the production of high refractory cement, the main component is expensive alumina, whose reserves are limited. Therefore, a waste water treatment (as a calcium-containing component), and waste of a rejected catalyst carrier K-905 D2 and waste spent catalyst carrier GIAP 3-6 (as an alumina-containing component) used by PJSC "Severodonetsk Association Azot" are proposed. According to the results of experimental studies, it was found that the main clinker minerals of alumina cement based on water treatment slurry and catalyst carrier waste are calcium monoaluminate, calcium dialuminate and nickel spinel. The presence of hydraulically inert gelenite can be avoided by using the melting method. The optimal parameters for the cements synthesis is a temperature of 1380 - 1400 ºC with isothermal exposure at a maximum temperature of 3 hours. The complete course of phase formation reactions by such technological synthesis parameters is ensured. The composition consisting of water treatment sludge and rejected catalyst carrier K-905 D2 in the ratio of 50÷50 are selected as the optimal one. The composition has increased strength characteristics in all conditions and hardening periods according to the results of experimental studies. Using electron microscopy (JSM-840 scanning microscope), the obtained clinker cleaved surfaces of the experimental batch were investigated. It has been established that the structure of the alumina cement clinker is represented mainly by uniformly distributed inclusions of various shapes of gray-green color. The clinker is densely sintered with a uniform crystalline surface, pores as such are not observed. The predominance of brown colors in the clinker structure indicates the complete progress of the phase formation process.