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the slag
When temperature was over 1,100°C, more than 99.9% of the dioxins could be decomposed and most of the heavy-metals could be solidified in the slag.
      
It is shown that the higher the slag basicity, the stronger the hydration interactions in alkaline binder compositions causing their hardening, all other things being equal.
      
Water vapor dissolution in the slag melt model introduced in the paper is based on polymer theory.
      
The results show that the adsorption of phosphate on the slag was rapid and the majority of adsorption was completed in 5~10 min.
      
The adsorption capacity of phosphate by the slag was reduced dramatically by acid treatment.
      
These results indicate that the P adsorption on the slag is not completely reversible and that the bond between the slag particles and adsorbed phosphate is strong.
      
The authors explored the possibility of improving the early strength of the slag cement by applying crystal seed technology.
      
Therefore, the early strength of the slag cement is obviously improved.
      
Activation of the slag cement was performed using a composite activator.
      
The effect of 20 wt% Al2O3 additive introduced into the slag on intensifing the precipitation was also investigated.
      
X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX) were used to investigate the slag after heat treatment.
      
The content of the slag was checked by XRF for the calculation thermodynamics study.
      
The active concentrations of materials in the slag, the slag abilities of oxidation and sulfur removal in EAF dust reduction process were determined by thermodynamics calculation study on CaO-MgO-FeO-Fe2O3-SiO2-S slag at 1 550 °C.
      
The sulfur removal ability is dependent on the amount of added ferro-silicon and the basicity of the slag.
      
The elements of iron, chromium and nickel in the ingot and the components of metal oxides in the slag were analyzed.
      
The thermodynamic model for FeO-Cr2O3-MgO-SiO2 slag was set up and the active concentrations of substances in the slag at 1 550 °C were determined by thermodynamic calculation according to the experimental data.
      
The lifetime of the solid slag shell is in the range of 7-16 s and increasing the pre-heating temperature of the pellet and the slag temperature can shorten the slag shell lifetime.
      
A higher slag temperature can also improve the pellet melting and the melting time is reduced by 10-15 s when the slag temperature is increased from 1 450 to 1 550 °C.
      
It is shown that, as the amount of reducer (coal) with respect to the concentrate is increased from 1: 30 to 1: 5, the weight fraction of Fe2O3 in the slag decreases from 34.7 to 27.2%, while the fraction of FeO increases by 6.3% (from 1.4 to 7.7%).
      
For the slag containing 20 wt % iron oxide, at T = 1423 and 1523 K, the viscosity equals 0.675 and 0.276 Pa s, respectively.
      
 

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