-Through the study of the slab continuous casting production process and laboratory simulation, the mechanism of transverse corner cracks on a micro-alloyed high-strength steel slab was explored. Then, a chamfered mold was developed and tested on the caster. The results show that on one hand, the chamfered mold could raise the temperature of the corner in the mold, and on the other hand, the higher temperature of the corner of the slab was an effective way to decrease the corner stress at the straightening point. The straightening deformation rate on the chamfered slab was lower than that on the square slab. Using the large chamfer mold technology, the optimization design of the foot roll structure and second cooling, the transverse corner crack was improved effectively. The hot transporting ratio was increased without the cutting angle.
Recovery of titanium from titanium bearing blast furnace slag by ammonium sulphate and potassium sulphate melting method is carried out for the first time, which transforms the titanium bearing substances such as perovskite (CaTiO 3 ) into water soluble ones, such as TiOSO 4 . The effect of reaction temperature on recovery efficiency of titanium was investigated through the experiment. The results showed that the recovery efficiency of titanium increased slightly with the increase in reaction temperature from 320 to 410uC. The conditions of titanium recovery from titanium bearing blast furnace slag are 410uC for 35 min, with the mass ratio of water quenched titanium bearing blast furnace slag, ammonium sulphate to potassium sulphate at 1 : 8 : 1. Under these conditions, the recovery efficiency of titanium was 94?7%, which was higher than ammonium sulphate melting method. Recovery efficiency of titanium was increased due to the presence of potassium sulphate. In addition, the residue was in the form of a solid powder, and the content of TiO 2 in residue was 3?20%.Pour la premiè re fois, on a effectué la ré cupé ration du titane à partir de laitier de haut-fourneau porteur de titane par la mé thode de fusion au sulfate d'ammonium et au sulfate de potassium, qui transforme les substances porteuses de titane comme la pé rovskite (CaTiO 3 ) en substance soluble dans l'eau, comme le TiOSO 4 . On a examiné par expé rimentation l'effet de la tempé rature de ré action sur le rendement de la ré cupé ration du titane. Les ré sultats ont montré que le rendement augmentait lé gè rement avec l'augmentation de la tempé rature de ré action de 320uC à 410uC. Les conditions de cette ré cupé ration du titane sont de 410uC pendant 35 min, avec le rapport de masse du laitier de haut-fourneau porteur de titane, trempé à l'eau, au sulfate d'ammonium et au sulfate de potassium, de 1:8:1. Sous ces conditions, le rendement é tait de 94?7%, ce qui é tait plus é levé que la mé thode de fusion au sulfate d'ammonium. Le rendement augmentait grâ ce à la pré sence du sulfate de potassium. De plus, le ré sidu avait la forme d'une poudre solide et la teneur en TiO 2 de ce ré sidu é tait de 3?20%.
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