QUESTIONS OF STRUCTURAL FORMATION OF CEMENT CLINKER WHEN USING INDUSTRIAL WASTE

Abstract

The use of waste from other industries as a component of raw material mixtures for producing cement clinker requires taking into account their complex impact on the processes of structure formation in the technological production cycle.

This work examines the features of the structure formation of raw material mixtures using high-tonnage waste from the thermal power industry in the technological process of cement clinker production. The object of the study was three-component raw material mixtures based on silicate systems of limestone with various alumino-silica-containing components and fly ash from the Burshtyn TPP. The work used a combination of modern physicochemical analysis methods with standardized testing of raw material and binder properties. Structural, mechanical and rheological properties of cement slurry samples were determined using Weiler-Rebinder and Rheotest-2 devices. X-ray phase analysis of clinker samples was performed using a DRON-3M diffractometer. Using the computer program "Clinker", a quantitative assessment of the possible volumes of waste utilization was given and the composition of mixtures with a content of 8.5 to 15.5 wt. % of fly ash was determined. The influence of fly ash on the structural, mechanical and rheological characteristics of sludge is shown, which determines the possibility of regulating its stability in working tanks and fluidity during transportation through pipelines. The increased content of iron oxides and the glass phase of fly ash contribute to the intensification of sintering of the mixture during firing with changes in the phase composition of clinker. It has been determined that the development of the physicochemical principles of the structure formation of silicate systems in the processes of clinker production using technogenic raw materials is an important aspect of further modernization of technology and equipment of modern cement production.