Papers by Keyword: Gas Quenching Steel Slag

Abstract: In order to study the application of fluidized bed process for the gas quenching steel slag(GQSS) slag-iron separation, according to the principles of fluidized bed material separation, based on the all GQSS, this paper researches the influence law of fluidization characteristics and the fluidization performance of GQSS after adding 20% (calculated by volume) iron grains. The experiment uses single hood fluidized bed as experiment device, studies the GQSS and iron grains of critical fluidization and slugging fluidization of other characteristics in the fluidization process, and determinates the packing density in interior and exterior of the tube. The results show that: when the material is all GQSS, the appropriate fluidization thickness of material layer is 300~400mm ; after adding 20% iron grains in the tube, the appropriate fluidization thickness of material layer is 350~400mm. The results of this paper on GQSS slag-iron separation have important theoretical significance.

Abstract: The sodium silicate has activation function on the macroscopic mechanical properties and microscopic structure of the gas quenching steel slag cement. Research results show that: Under the activation of the sodium silicate, when the content of the gas quenching steel slag cement is 30% to 40%, acid Salt, Portland cement grade 42.5 can be produced. Even when the content of gas quenching steel slag is improved to 50%, slag Portland cement grade P·S·A32.5 can still be produced. Seen from the hydration products, the sodium silicate reacts with the ions in the gas quenching steel slag, on one hand, initial framework is formed to enrich the network structure; and on the other hand, in the hydration process, a large number of C-S-H gel, ettringite crystal and a small amount of Ca (OH)₂ are formed, which improves the strength of cement.

Abstract: This thesis analyzes the existence form of MgO in the gas quenching steel slag. By calculating the degree of saturation of the MgO in the gas quenching steel slag and adopting the method of electronic probe, it investigates the corrosion of the viscosity of the gas quenching steel slag to MgO crucible when measuring viscosity under a high temperature and explains why the gas quenching steel slag exerts no corrosion to the MgO crucible with the help of the metallurgy thermodynamics principle.

Abstract: By adopting heat-stew steel slag(HSSS) as a contrast, this research studied the gas quenching steel slag(GQSS) grindability using fractal theory and grinding power index. The results showed that the two kinds of steel slag had a good fractal characteristic, and the smaller fractal dimension was, the better grindability would be. Studied on the fractal dimension and grinding time of the two kinds of steel slag as well as their specific surface areas, a conclusion drawn that with the extending of grinding time, the fractal dimension of them would be continuously increased. However, within the same grinding time, GQSS not only have a relevant good distributed particle structural and a smaller fractal dimension, but also have a better linear relation between specific surface areas and fractal dimension. By determining the grinding power index, the correctness of using fractal theory to study GQSS can be proved. Meanwhile, the result also shows that GQSS has a better grindability.

Abstract: Gas quenching steel slag (GQSS), which was prepared by gas quenching equipment under inert atmosphere, possessed some advantages for pollutants removal from wastewater. Static state experiment has been carried on to investigate Cr(III) removal from wastewater by GQSS. The results indicated that solid-liquid ratio, Cr(VI) original concentration, libration time and dissolved oxygen have significant influence on Cr(III) removal percentage. Take economic cost into account, the ratio between the mass of GQSS and the volume of Cr(III)-bearing solution should be controlled at 3:100. Because Cr(III) removal from wastewater by GQSS went through absorption and precipitation, the removal percentage of Cr(III) increased gradually with the reaction time. Moreover, Cr(III) removal percentage declined with the increasing of Cr(III) original concentration. Along with the declining of dissolved oxygen under sealed with lid, the redox potential in the solution decreased, and then the removal percentage of Cr(III) increased.