Reusing Desulfurization Slag in Cement Clinker Production and the Influence on the Formation of Clinker Phases

Abstract

Abstract:The purpose of this study was to investigate the reuse of desulfurization slag in cement clinker production and its influence on the formation of clinker phases. The desulfurization slag that mainly contained Ca and Si was identified as non-toxic, and thus it should be suitable to be reused in clinker production. The addition of desulfurization slag increased the melt phase during clinkerization, but the excess melt phase inhibited the formation of clinker phases. This could be attributed to the sulfur and fluoride derived from the De-S slag. At low desulfurization slag addition (5.4 wt %), the resulting clinker had a mineralogical composition similar to that of the reference clinker. The desulfurization slag added can lower the clinkerization temperature and increase the amount of Ca 3 SiO 5 at 1300 • C, which may be beneficial to energy conservation in clinker burning. Moreover, reusing desulfurization slag additionally has the potential to reduce the energy needed for clinker grinding.

Ultrasound irradiation as an effective tool in synthesis of the slag-based catalysts for carboxymethylation

“…This complex slag morphology is attributed to the complexity of the elemental composition, namely presence of several oxides. According to the literature, large agglomerate species can be assigned to calcium-containing compounds (calcium hydroxide, calcium carbonate) [25] , while prismatic needle shape crystals can represent an ettringite phase (hydrous calcium aluminum sulfate mineral) [26] , [27] – a product of the clinker phases hydration present in the desulfurization slag [28] , [29] . Micrographs of the materials synthesized from the desulfurization steel slag using different treatment methods are shown in Fig.…”

Bending Force of Hot Rolled Strip Based on Improved Whale Optimization Algorithm and Twinning Support Vector Machine

“…However, the traditional BP (back propagation, a multi-layer feed-forward neural network trained according to an error back propagation algorithm, is one of the widely used neural network models) neural network model has the local minimum value problem, which leads to the non-uniqueness of model parameters and increases the difficulty of modeling. Moreover, if the number of samples is too small, the modeling effect is difficult to guarantee [6][7][8]. To solve the above problems and achieve a higher quality of plate shape, it is necessary to improve the accuracy of model prediction and computational speed to ensure the control effect of bending force, and to provide the theoretical basis for exploring new model methods for bending force setting.…”

Peculiarities of Portland Cement Clinker Synthesis in the Presence of a Significant Amount of SO3 in a Raw Mix

“…Sulfur and its oxides in the form of sulfate and sulfide minerals appear in the raw mixture of Portland cement clinker with the main raw materials for the preparation of clinker, namely clay and carbonate rock as well as additives and fuel. The technogenic origin additives of the metallurgical and heat-power industry, namely slags, fly ashes and oil cokes have especially high concentration of sulfur compounds [1][2][3]. According to [4] sulfur with calcium oxide forms calcium sulfate CaSO 4 under conditions of oxidative burning.…”