Abstract
In Russian practice, the vast majority of thermal units and other industrial furnaces are still built with the use of single-piece ceramic refractories. The purpose of research was to develop a wide range of special materials suitable for repairs of any linings of thermal units. In accordance with the purpose, this paper solved the following tasks: Selecting reactive binders used in the compositions of refractory concrete capable of structural modification of any refractory lining materials; Developing impregnating-coating compositions based on reactive binders capable of forming a protective coating with high adhesive strengthen linings; Developing compositions of refractory ramming mixtures, used for the repair of large fragments of linings and having high adhesion to any refractory lining materials; Checking the effectiveness of the technology in production environment. In this paper, we used not only standard techniques but also specially designed ones, in particular, to determine the adhesion of refractory coating to the refractory lining materials. The technology of repair works consists of application of some or all of the above solutions depending on the state of worn out lining of the thermal unit. Testing was carried out on many sintering plants of Samara region where rotary kilns are operated. The use of such chemically active substances as phosphate bonds and sodium silicate solutes in special refractory repair compositions with different functional purpose, allowed increasing the durability of liners of expanded fire clay rotary kilns as a result of reparatory works. Some items from the general technological scheme of repair works to restore the linings of heating units may be used in industrial furnaces in many industries.
Highlights
Technical progress in the construction of linings of industrial furnaces and other thermal units is associated with the introduction of new technology and modern refractory lining materials: single-piece ceramic and melt-molded refractories, prefabricated and monolithic refractory unfired concrete, dry mixes for applying repair mixtures by mortaring method and impregnating and impregnating-coating compositions for increasing the operation time of the linings of thermal units
Many industrial enterprises in the Samara region are in need of non-waste technologies, i.e. in their structures the formed byproducts must be processed into materials that will be further needed, either for repair of various technological equipment, or for the manufacture of building materials complying with a particular regulatory document, possibly the National State Standard
If we turn to the experience of leading or developed countries, we can see that their attitude to any industrial waste produced even in small quantities is quite different than that in Russia, where landfills or disposal sites for wastesare systematically organized. In these countries (USA, Canada, Japan, Britain, France and others.)theproblems of industrial wasteutilization become relevant already at the stage of laboratory or experimental studies, even at pilot-scale testing, when a new technologyis only launched into the production, and it is impossible to avoid the formation of certain by-products, i.e. industrial waste
Summary
Technical progress in the construction of linings of industrial furnaces and other thermal units is associated with the introduction of new technology and modern refractory lining materials: single-piece ceramic and melt-molded refractories, prefabricated and monolithic refractory unfired concrete, dry mixes for applying repair mixtures by mortaring method and impregnating and impregnating-coating compositions for increasing the operation time of the linings of thermal units.Significant major developments in the field of creating refractory lining materials are focused primarily on heat-resistant concrete on various binders [1,2,3,4,5]. Despite various aggressive media, which in addition to temperature effects have a significant disruptive effect on the single-piece refractories, fireclay ceramics in the form of bricks and other elements remains a traditionally widely used material for the manufacturing of linings of many thermal units. In this regard, a very actual issue is the development of effective resource and energy saving technologies of repairing thermal unit linings allowing them to extend their service life [6,7,8,9,10]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
