Electric arc furnace dust (EAFD) is a solid waste generated in the collection of particulate material during steelmaking process in electric arc furnace. The aim of this work is to carry out a chemical and structural characterization of two EAFD samples with different Zn contents. Optical emission spectroscopy via inductively coupled plasma (ICP), X ray diffractometry (XRD) and Mössbauer spectroscopy analysis were carried out in such EAFD samples. From XRD measurements, the samples exhibits the following phases: ZnFe2O4, Fe3O4, MgFe2O4, FeCr2O4, Ca0.15Fe2.85O4, MgO, Mn3O4, SiO2 and ZnO. The phases detected by Mössbauer spectroscopy were: ZnFe2O4, Fe3O4, Ca0.15Fe2.85O4 and FeCr2O4. Magnesium ferrite (MgFe2O4), observed in the XRD patterns as overlapped peaks, was not identified in the Mössbauer spectroscopy analysis
For about 10 years the steel industry in Brazil has used pulverized coal injection (PCI) technology in the blast furnaces based on imported coals. In order to decrease the dependence on imported coals, Brazilian coal, which has limited use due to high ash content, was suggested to be mixed with imported coal and charcoal. The aim was to examine the reactivity of the samples. The charcoal use in the steel industry contributes to the CO 2 emission reduction, since it represents a renewable source of energy. The reactivity of the coals, charcoal and mixtures was evaluated through simultaneous thermal analyses. Results of this study are presented and discussed.
ResumoO presente trabalho é um estudo preliminar a respeito do efeito dos voláteis na combustibilidade etambém visa identificar a influência do tamanho de partícula na variação da pressão durante a combustão no Simulador de PCI. Foram estudados um carvão alto, um baixo volátil e misturas desses carvões.A avaliação do efeito dos voláteis se deu a partir da medida da variação de pressão no reator ocasionada pela combustão e pelo cálculo do burnoutdos chars coletados após o ensaio. A análise do efeito do tamanho de partícula sobre a variação da pressão durante a combustão se deu através da combustão do carvão baixo volátil em diferentes faixas granulométricas. Os resultados mostraram que o carvão alto volátil apresentou a maior combustibilidade e que quanto maior o teor desses carvões na mistura, maior foi a combustibilidade da mistura. O Simulador de PCI separou satisfatoriamente, através dos perfis de pressão, o comportamento durante a combustão de carvões com diferentes teores de voláteis, suas misturas e variadas faixas granulométricas. A relação entre a variação da pressão e a combustibilidade dos carvões e suas misturas ainda precisa ser mais exploradas. Palavras-chave:Carvão; PCI; Combustão; Simulador de PCI
INFLUENCE OF VOLATILE AND PARTICLE SIZE OF COALS ON COMBUSTION IN PCI RIG AbstractThe presentworkis a preliminarystudyabouttheeffectofvolatilesoncombustibilityandalsoaimstoidentifytheinfl uenceofparticlesizeonthevariationofpressureduringcombustion in the PCI Rig. A high andlowvolatilecoalandmixturesofthesecoalswerestudied.The evaluationoftheeffectofthevolatileswasbasedonthemeasurementofthepressurevariatio n in thereactorcausedbythecombustionandthecalculationofthe burnout ofthe chars collectedafterthe test. The analysisoftheeffectofparticlesizeonthepressurevariationduringcombustionoccurredthr oughthecombustionofthelowvolatilecoal in differentsize ranges. Resultsshowedthatthe high volatile coalpresentedthehighestcombustibilityandthatthehigherthecontentofthesecoals in themixture, thegreaterthecombustibilityofthemixture. The PCI Rigsatisfactorilyseparated, throughthepressure profiles, thebehaviorduringthecombustionofcoalswithdifferentvolatilecontents, theirmixturesandvariousgranulometricbands. The relationshipbetweenthepressurevariationandthecombustibilityofthecoalsandtheirmixtu reshasyettobefurtherexplored.
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