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Liquid LF slag was, after being poured out of the ladle furnace cooled in the air, after which it was subjected to the following procedures: crushing, magnetic separation in order to remove leftover particles of the cooled steel melt, milling and sieving. The twelve samples were dried at 378 K in a temperature
The EAF and LF slag processing became an actual issue at the present day metallurgy. The possibility of joint and complete utilization of both electric furnace and ladle slag is considered in this paper. The purpose of the work was to develop a method for joint processing of EAF and LF slag with the production of marketable products. A simplexlattice planning method was used during the work.
The carbonation of LF slag was found to be suitable for use as a fine aggregate. Significant amounts of carbon sequestration could be realized in a potentially useful form that further utilizes a waste slag material. Carbon ated mortars that used LF slag sand offer the largest gains in terms of CO. 2. uptake.
Because blast furnace slag contains fertilizer components CaO, SiO 2, and MgO, it is used in rice cultivation as calcium silicate addition to these three components, steelmaking slag also contains components such as FeO, MnO, and P 2 O 5, and is used for a broad range of agricultural purposes, including dry field farming and pastures in addition to rice cultivation.
Apr 10, 2020· In order to make a complete characterization of ladle furnace slag (LF slag, LFS), as nonhazardous industrial waste, and to solve its permanent disposal and/or recovery, bearing in mind .
During the steelmaking process a large amount of slag is produced, which becomes a source of waste, which in many instances is land filled. Such areas filled with waste materials have become a significant source of pollution. Slag recycling is then becoming important in recent years. Recycling can be an efficient option to reduce such waste.
Oct 08, 2016· An efficient approach to overcome these problems is the slag utilization. Physical and chemical characterization of steel slag is a deciding factor of steel slag utilization as recycled raw material as road aggregate, cement and concrete admixture, soil .
The use of fertilizers and materials produced from blast furnace and steel slags has a long tradition. For example Thomasphosphate had been used for more than hundred years. Silicate lime fertilisers (blast furnace lime and converter lime) are approved fertilizers in Germany since more than 60 and 30 years, respectively. They contain elements with useful properties [.]
This paper presents result of an experimental investigation carried out to evaluate effects of replacing aggregates (coarse fine) with that of Slag (Crystallized Granular) which is an industrial waste byproduct on concrete strength properties by using Taguchi''s approach of optimization. Whole study was done in three phases, in the first phase natural coarse .
Oct 08, 2016· An efficient approach to overcome these problems is the slag utilization. Physical and chemical characterization of steel slag is a deciding factor of steel slag utilization as recycled raw material as road aggregate, cement and concrete admixture, soil stabilizer and construction materials, etc.
Apr 14, 2020· Ladle furnaces (LF) are the most common installations in the secondary refining of steel. In the LF treatment, steel reheating, alloying, deoxidation, desulfurization, and inclusion modification can be realized. The stirring of steel by Ar purging favors the homogenization, inclusion removal, and steel/slag reactions.
Jun 18, 2019· The effective utilization of slag fertilizer in agriculture to neutralize soil acidity, improve crop productivity, mitigate greenhouse gas emissions, and stabilize heavy metals in contaminated soils turns it into a high value added product in sustainable agriculture. These effects could be due to the shift in microbial metabolism and/or modification of microbial habitats.
materials like slag, dust, sludge, etc. Significant quantities of wastes are generated from steelmaking process which is a focus point nowadays its utilization as well as environmental impact. Steelmaking process broadly includes all operations from primary and secondary steelmaking to ingot and continuous casting of steel. ...
The LF slag sample was sieved into two different sets (<45 mmand<250 mm). In order to activate the LF slag, 2 M NaOH and sodium silicate solution alkali reagents at a ratio of 1:1 (w/w) were sprayed on the samples until 12% w/ w of the reagent to the LF slag been used. Samples were then casted in cylindrical moulds of size 25 mm diameter by 50 ...
Sep 16, 2019· Ladle furnace (LF) slag can be used as a replacement to synthetic fluxes owing to its chemical and mineralogical compositions. Valorization of LF slag helps in sustainable steelmaking and also reduces steel production cost. In spite of beneficial composition, valorization of LF slag is difficult due to its disintegration phenomenon.
b) Slag volume and fluidity requirements for optimum LF refining c) Slag fluidity requirements for operations with a LF and those without a LF d) Stirring, heating and argon flow rates in the ladle VI) Using phase diagrams to explain slag fundamentals and design slag recipes a) Utilizing the binary CaOMgO system to explain binary diagrams
to Nippon Slag Association''s statistics on the use of slag in 2012, the total consumption of blast furnace and steelmaking slags for fertilizer and soil amendment was 260 000 tons. Fertilizers made from blast furnace slag and steelmaking slag Iron and steel slag can largely be divided into blast furnace slag and steelmaking slag.
Due to the presence of free lime (calcium oxide) and depending on the final end use of the EAF slag, the stockpiles may be weathered for a designated time period in controlled areas. Weathered slag is tested to check the expansion properties of the material as identified in BS EN 17441 to meet the requirements of its end use.
Raw LF slag sent to grinding plant, after separation of metallic part, in order to get powder under 3 mm. Based on the chemistry of slag powder, a final mix was blended using calcium and calcined bauxite to meet the chemistry and size specifications for Dofasco''s LMF.
This paper presents result of an experimental investigation carried out to evaluate effects of replacing aggregates (coarse fine) with that of Slag (Crystallized Granular) which is an industrial waste byproduct on concrete strength properties by using Taguchi''s approach of optimization. Whole study was done in three phases, in the first phase natural coarse aggregate was replaced by ...
The alkalinity, viscosity and surface tension of the density meter of the LF furnace refining slag will affect the melting performance, desulfurization performance and ing performance of the refining slag. Therefore, in the use of refining slag, the rational selection of refining slag should be based on specific engineering needs.
Recovery and utilization of oxides in steel slag of LF refining furnace The aluminum in the LF refining steel slag is present in the form of a 12CaO • 7Al2O3 mineral phase with high activity. It is easier to react with the acid and alkali, and it is easier to extract the alumina compared with the traditional aluminumcontaining minerals.
Both converter slag and el ectric arc furnace slag are mainly utilized for road and civil construction, ground improvements and reuse in the steel plant. Other utilization purposes in marine environment such as preventing the eutrophication of phosphorus or suppressing the activity of sulfate reducing bacteria havebeen investigating.
carbonated LF slag as a fine aggregate in concrete. To reduce the free lime content while binding gaseous CO2 into solid carbonates, the slag was carbonated using CO2. Samples were tested using the carbonated LF slag as a fine aggregate in zeroslump pressformed compact mortar and compared to similar samples containing ...
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