The application of hard withdrawals of soda plant as the active mineral additive of with the production of Portland cement
Subjects of research: the hard withdrawals of soda production, the slime of cleaning brine, slaked lime, lime, limestone, gypsum, Portland cement, concrete, calcium chloride, sodium chloride.
Purpose of work: Development of the chemical-engineering of the bases of obtaining and studying the construction- operational properties of multicomponent Portland cement with the use of hard wastes of soda production as the carbonatccontaining filler and the intensifiers of hardening.
Methods of research: chemical, rocntgcnographic, differential-thermal, electron-microscopic. Methods for physicomcchanical testing of cements, solutions and concretes in accordance with in force standards.
The results obtained and their novelty: Arc obtained high-strength and salt-tolerant cements, solutions and concretes on the basis of the local withdrawals (hard withdrawals of the Kungrad soda plant) of those improving their properties and decreasing prime cost.
It is established that the application of an additive of production waste of the soda ash before quantity 1-30% as the intensifier of hydration and hardening of Portland cement accelerates the process of the hydration of alit component to the 28- daily period respectively as far as 17-45%. Portland cement the containing hard withdrawals of soda production better noted that harden under normal conditions and with the warm moist working; the cement mortar (and concretes), which harden 28 days under normal conditions, before the natural conditions continue to harden with the speed of normal hardening and have sufficiently high strength. It is also established that the finely ground dispersed hard withdrawals arc capable of playing the role of the active microfiller of cement, which makes it possible to decrease its expenditure. The contact zone “concrete block - filler” before the presence of dispersed hard withdrawal has the higher values of microhardness, as a result of the adsorption of portlandite by hard withdrawals, interaction of hard withdrawal with carbonates of calcium and chloride calcium of aluminates and alumos-ferrite.
Practical value: Is for the first time before Uzbekistan established possibility before the large volumes of the utilization of the hard and liquid waste of soda production by their introduction beside the Portland cement as the finely ground mineral filler and the intensifier of hardening with obtaining of effective, cements, which exceed about the construction- operational indices both traditional, and sulfate resistent Portland cement.
Degree of embed and economic effectivity: The technologies proposed arc approved on an industrial scale with the development of multicomponent cement at the Angren cement combine. Is obtained the cement, which corresponds down the requirements of stamp M-500. The manufactured parties of cement arc used beyond Society with the limited responsibility “Bcton invest” in Almalyk city Tashkent region. The articles arc released: the plate of enclosure (ПО), chute is tray (JIK) and fundamental blocks (ФБС) 24.4.6, which correspond down the requirements of stamp M-300. The savings of cement comprises to 20% with the sufficiently good quality of concrete mixture and ferroconcrete constructions. The total volume of the prepared cement 100 T. economic effect with the production of the experimental-industrial party of Portland cement of M500 of Д20 with the hard withdrawals composes 4422469,8 sum. The expected economic effect with the volume 1 mln. t/yr of multicomponent cement will comprise more than 33 billion sum.
Field of application: AK. “Uzkurilishmatcriallari”.