Ferrochrome slag is a kind of industrial waste containing Cr\+\{6+\} and is produced in the process of silico ferrochrome smelting. On the basis of analyzing the chemical composition and mineral composition of ferroc...Ferrochrome slag is a kind of industrial waste containing Cr\+\{6+\} and is produced in the process of silico ferrochrome smelting. On the basis of analyzing the chemical composition and mineral composition of ferrochrome slag, this paper has put forward a technology of green portland cement clinker calcinated from ferrochrome slag. In the experiment, physical chemical changes of cement clinker in the burning process of ferrochrome slag were investigated. The effects of calcinating temperature and clinker cooling rate on the solubility value of Cr\+\{6+\} were analyzed. The results indicated that when the calcinating temperature is above 1450℃, and the cooling rate is beyond 120 ℃/min, Cr\+\{6+\} in cement clinker is almost insoluble.展开更多
The promotion of blast furnaces slag in construction industry aims at protecting the environment, fighting against the nuisance such as waste dumps and promoting local products. The use of granulated slag as a part re...The promotion of blast furnaces slag in construction industry aims at protecting the environment, fighting against the nuisance such as waste dumps and promoting local products. The use of granulated slag as a part replacement of Portland cement or in the production of clinker free binder constitutes a valuable outlet for this product. The aim of this study is the characterization of local granular slag using various techniques such as chemical analysis, X ray diffraction, differential thermal analysis, infrared spectrometry, and conductimetry. These methods provide a clearer understanding of the vitreous structure of this type of slag and also provide clues as to the nature of its hydraulic reactivity. Mechanical tests have been carried out using 4 × 4 × 16 cm3 prismatic mortars using a composition activated by the clinker, varying the fineness of slag, its content and the nature of clinkers. Results obtained show that this type of slag is reactive, the evolution of its mechanical resistance depends on its fineness, and that long-term mechanical performance is of great interest.展开更多
A new kind of mortar made of ground granulated blast-furnace slag （GGBFS）, gypsum, clinker and steel slag sand （〈4.75 mm） was developed. The ratio of steel slag sand to GGBFS was 1 ： 1 and the amount of gypsum w...A new kind of mortar made of ground granulated blast-furnace slag （GGBFS）, gypsum, clinker and steel slag sand （〈4.75 mm） was developed. The ratio of steel slag sand to GGBFS was 1 ： 1 and the amount of gypsum was 4% by weight while the dosage of clinker ranged from 0% to 24%. The optimization formulation of such mortar was studied. The content of steel slag sand should be less than 50% according to the volume stability of blended mortar, and the dosage of clinker is about 10% based on the strength development. Besides strength, the hydration heat, pore structure and micro pattern of blended mortar were also determined. The experimental results show the application of steel slag sand may reduce the dosage of cement clinker and increase the content of industrial waste product such as GGBFS, and the clinker is also a better admixture for blended mortar using steel slag sand.展开更多
The application technology using Baosteel steel slag powder as an admixture of concrete is the developmental direction of steel slag recycling treatment and utilization, which fully reflects the basic features and goo...The application technology using Baosteel steel slag powder as an admixture of concrete is the developmental direction of steel slag recycling treatment and utilization, which fully reflects the basic features and good compatibility of the over-calcined clinker of steel slag resources. It is beneficial to fully exploit the water hardening characteristic and potential activity of steel slag, to reduce and control the unstable factors, such as free calcium oxide and magnesium oxide, and to realize high value-added applications and explore new application fields.展开更多
文摘Ferrochrome slag is a kind of industrial waste containing Cr\+\{6+\} and is produced in the process of silico ferrochrome smelting. On the basis of analyzing the chemical composition and mineral composition of ferrochrome slag, this paper has put forward a technology of green portland cement clinker calcinated from ferrochrome slag. In the experiment, physical chemical changes of cement clinker in the burning process of ferrochrome slag were investigated. The effects of calcinating temperature and clinker cooling rate on the solubility value of Cr\+\{6+\} were analyzed. The results indicated that when the calcinating temperature is above 1450℃, and the cooling rate is beyond 120 ℃/min, Cr\+\{6+\} in cement clinker is almost insoluble.
文摘The promotion of blast furnaces slag in construction industry aims at protecting the environment, fighting against the nuisance such as waste dumps and promoting local products. The use of granulated slag as a part replacement of Portland cement or in the production of clinker free binder constitutes a valuable outlet for this product. The aim of this study is the characterization of local granular slag using various techniques such as chemical analysis, X ray diffraction, differential thermal analysis, infrared spectrometry, and conductimetry. These methods provide a clearer understanding of the vitreous structure of this type of slag and also provide clues as to the nature of its hydraulic reactivity. Mechanical tests have been carried out using 4 × 4 × 16 cm3 prismatic mortars using a composition activated by the clinker, varying the fineness of slag, its content and the nature of clinkers. Results obtained show that this type of slag is reactive, the evolution of its mechanical resistance depends on its fineness, and that long-term mechanical performance is of great interest.
基金the National Natural Science Foundation of China(50678139)the Open Foundation Program of Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education(Wuhan University of Technology) China(No.SYSJJ2005-08)
文摘A new kind of mortar made of ground granulated blast-furnace slag （GGBFS）, gypsum, clinker and steel slag sand （〈4.75 mm） was developed. The ratio of steel slag sand to GGBFS was 1 ： 1 and the amount of gypsum was 4% by weight while the dosage of clinker ranged from 0% to 24%. The optimization formulation of such mortar was studied. The content of steel slag sand should be less than 50% according to the volume stability of blended mortar, and the dosage of clinker is about 10% based on the strength development. Besides strength, the hydration heat, pore structure and micro pattern of blended mortar were also determined. The experimental results show the application of steel slag sand may reduce the dosage of cement clinker and increase the content of industrial waste product such as GGBFS, and the clinker is also a better admixture for blended mortar using steel slag sand.
文摘The application technology using Baosteel steel slag powder as an admixture of concrete is the developmental direction of steel slag recycling treatment and utilization, which fully reflects the basic features and good compatibility of the over-calcined clinker of steel slag resources. It is beneficial to fully exploit the water hardening characteristic and potential activity of steel slag, to reduce and control the unstable factors, such as free calcium oxide and magnesium oxide, and to realize high value-added applications and explore new application fields.
