Blast Furnace Slag In the production of hot metal the blast furnace is charged with ironbearing materials iron ore sinter pellets etc flux limestone Figure 36 Ironmaking Iron Units US 2000 andor dolomite and fuel coke SRI 2001Two products are obtained from the bottom of the blast furnace molten iron and slag
Slag is a byproduct formed during the manufacturing of steel in blast furnace slag calcium sulfide is a predominant impurity that results in environmental concerns specifically when used for trails road beds and embankments the calcium sulfide leaches from the slag
In the past slag was taken from the blast furnace basic oxygen furnace bof and electric arc furnace eaf and hauled off to a hazardous dump site where millions of tons have accumulated the major waste by product from steel production is slag at 7915 as shown in 1
The study presented in this paper has mainly consisted of developing an environmental model of the aggregate production process an environmental assessment of blast furnace slag aggregates was performed at a given quarry site for two typical production scenarios with each yielding several gradings
The aim of presented work was investigation of possibilities for recycling of electric arc furnace demetallized slag into electric arc furnace charge the results are as follow 1 industrial experiments with recycling of demetallized eaf slag into eaf charge showed the additions of demetallized slag had no negative effects on smelting
22 blast furnace slag recycling in the slag cement production4 the slag cement production was the first form of slag recycling as hydraulic binder which appeared about 40 years before the addition of slag to clinker it was probably emil langen directorchief of friedrichwilhelm iron and steelworks in troisdorf germany who in
Blast furnace slag and the waste gases from various stages in the steelmaking process already have a wide range of uses for example we have a partnership with ecocem at our dunkirk and fos sites in france ecocem granulates blast furnace slag to create a partial replacement for portland cement
Of iron blast furnace slag is a renewable virgin material ie slag has not been previously used but has been formed as part of the iron making process as slag leaves the blast furnace in a molten form at1500176c it is a homogeneous material free from foreign matter types of blast furnace slag j blast furnace slag in australia is produced in
The blast furnace before refining in a steelmaking furnace tailoring the slag chemistry to optimize furnace operations is furthermore hampered by the presence of alkalis in the raw material alkali oxides are reduced to metal and the metal then evaporates in the hotter parts of the furnace only to be reoxidized in the furnace shaft
National slag association since 1918 the nsa has promoted the use of blast furnace and steel furnace slag blast furnace slag has been called the quotallpurpose aggregatequot as it can be used in all construction applications as either a normal weight or lightweight expanded or pelletized aggregate depending on how it was formed and processed
Blast furnace melting slag temperature up to 1400 1500 high heat is a high quality waste heat resourcesthe treatment process is mainly water quenching in chinaa large amount of high temperature slag is cooled by slag water and a large amount of hot water at 70 85is producedusually in order to ensure the recycling effect of the slag
The slag has a lower density than steel and therefore floats on top of the molten steel once the steel has been tapped into a ladle the slag is either poured from the furnace onto the floor where it is cooled and removed for further processing or into slag pots where specially designed vehicles are used to transport the slag to purpose built
Recycling of blast furnace sludge to the blast furnace via coldbonded briquettes evaluation of feasibility and influence on operation crushed bof slag are recycled via the sinter functioning as slag former3 steel plants without onsite sinter plants can use coldbonded briquettes for recycling
The blast furnace slag or blended blast furnace slag can only applied to be land 721 in cementitious mixes such as concrete and 722 in a noncementitious mix such as an engineered fill in earthworks or for roadmaking activities as follows a asphalt aggregate
A novel recycling process of blast furnace slag was developed in order to obtain colorless silicarich solids by using phase separation of borosilicate glass b2o3 was added to blast furnace slag to promote the phase separation the slag glasses were heattreated above glass transition temperatures
The cupola furnace slag originates from melting of gangue parts of metal bearing materials slag forming additions and coke ash the basic components of cupola slags are cao sio2 a al2o3 the cupola furnace slag properties are similar with blast furnace slag properties and this was the reason why cupola slag was used as a replacement of blast
Sep 16 2019nbsp018332the use of synthetic fluxes in secondary steelmaking not only improves the properties of top slag and steel quality but also increases the production cost 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
The mineral wool slag derives from the manufacturing of mineral wool rock wool insulation is composed principally of fibres manufactured from a combination of aluminosilicate rock usually basalt blast furnace slag and limestone or dolomite binders may or may not be used depending on the product
Were added to the furnace during smelting in order to evaluate the feo content of the slags two slag samples were taken from the first and last foamy slag produced during smelting thereafter the slag was grounded and 1 g of slag was then mixed with a mixture of 995 g lithium tetraborathe and 005 g
Granulated blast furnace slag granulated blast furnace slag is a glassy granular material that varies depending on the chemical composition and method of production from a coarse popcornlike friable structure greater than 475 mm no 4 sieve in diameter to dense sandsize grains passing a
Apr 10 2013nbsp018332blast furnace slag blastfurnace bf slag is defined by the american society for testing and materials as the nonmetallic product consisting essentially of silicates and aluminosilicates of calcium and other bases that is developed in a molten condition simultaneously with iron in a blast furnace
B 29 si and 27 al masnmr were performed on naohactivated blastfurnace slag to better characterize the amorphous and poorly crystalline phases which occur in this system the unreacted glass has a mainly dimeric silicate structure represented by a broad 29 si peak fwhm 15 ppm centered at 745 ppm q 1 with aluminum present exclusively in tetrahedral coordination
Jul 19 2019nbsp018332luo s zhou y yi c 2012 hydrogenrich gas production from biomass catalytic gasification using hot blast furnace slag as heat carrier and catalyst in movingbed reactor int j hydrog energy 371508115085
3department of resource recycling engineering university of science and technology daejeon korea to enhance the early strength of grounded granulated blast furnace slag ggbfs blended cement the activation characteristics of ggbfs were examined by a potassium aluminum sulfate psa clinker consisting of kalso 4 2 and amorphous al 2o 3
Blastfurnace slag powder or blast furnace slag powder which can not only improve concrete application quality but also reduce cement consumption the previous environmental pollution problem caused by slag can also be prevented through effective recycling blast furnace powder added cement socalled blast furnace cement has superior
The three most important trends for slag recycling relate to further investments in granulation plants for blast furnace slag the increase in slag trading with separate slag grinding plants and the increasing use of steelworks slag as an additive for the concrete industry
