A novel method to prepare soil nutrient amendment by calcining a mixture of white mud and potassium feldspar and its environmental assessment were investigated.Under the optimal conditions of a blending mass ratio of ...A novel method to prepare soil nutrient amendment by calcining a mixture of white mud and potassium feldspar and its environmental assessment were investigated.Under the optimal conditions of a blending mass ratio of 70-30 for white mud to potassium feldspar,a calcination temperature of 1 000℃,a calcination time of 1.5 h and spherulitic diameter of 2.0 cm,the calcined product,as a soil nutrient amendment,could be prepared with the following nutrient composition(mass fraction):K2O 4.16%,CaO 23.43%,MgO 5.04%,SiO2 22.92%,SO4 2-3.71%,and Cl -3.87%in 0.1 mol/L citric acid solution.The concentrations of heavy metals in the calcined product and the emission concentrations of harmful gases from a mixture of white mud and potassium feldspar during calcination process could qualify the National Standards without causing secondary environmental pollution.展开更多
The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers m...The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers makes structure of ramming materials dense. During the process of extruding mud and ramming materials, SiC is partly oxidized ; CaO , F% 03 and carbon penetrate towards the outer wall. The improvement of ramming materials can inhibit the penetration of molten slag, iron and carbon. The bulk density of environmental-friendly ramming ma- terials dried at 200 ℃ is 2.90 g · cm-3, the cold com- pressive strength of this kind of ramming materials dried at 200 ℃ is about 17. 0 MPa and fired at I 450 ℃ is about 39. 2 MPa.展开更多
基金Project(20877026)supported by the National Natural Science Foundation of China
文摘A novel method to prepare soil nutrient amendment by calcining a mixture of white mud and potassium feldspar and its environmental assessment were investigated.Under the optimal conditions of a blending mass ratio of 70-30 for white mud to potassium feldspar,a calcination temperature of 1 000℃,a calcination time of 1.5 h and spherulitic diameter of 2.0 cm,the calcined product,as a soil nutrient amendment,could be prepared with the following nutrient composition(mass fraction):K2O 4.16%,CaO 23.43%,MgO 5.04%,SiO2 22.92%,SO4 2-3.71%,and Cl -3.87%in 0.1 mol/L citric acid solution.The concentrations of heavy metals in the calcined product and the emission concentrations of harmful gases from a mixture of white mud and potassium feldspar during calcination process could qualify the National Standards without causing secondary environmental pollution.
文摘The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers makes structure of ramming materials dense. During the process of extruding mud and ramming materials, SiC is partly oxidized ; CaO , F% 03 and carbon penetrate towards the outer wall. The improvement of ramming materials can inhibit the penetration of molten slag, iron and carbon. The bulk density of environmental-friendly ramming ma- terials dried at 200 ℃ is 2.90 g · cm-3, the cold com- pressive strength of this kind of ramming materials dried at 200 ℃ is about 17. 0 MPa and fired at I 450 ℃ is about 39. 2 MPa.
