Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20221910
L. Faria, Ignacio Rubio Scola, A. P. L. Nunes
{"title":"Programação do processo de fusão para fundições de pequeno porte","authors":"L. Faria, Ignacio Rubio Scola, A. P. L. Nunes","doi":"10.4322/2176-1523.20221910","DOIUrl":"https://doi.org/10.4322/2176-1523.20221910","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70525780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20212489
Marlon Aparecido Alves Martins, Neilton Paixão de Jesus Junior, S. P. Taguchi, Renata Nunes Oliveira, Rui de Góes Casqueira, Luiz Antônio Borges Júnior
{"title":"Utilização do resíduo de vidro de uma empresa metalúrgica para aplicação em placas de solo-cimento","authors":"Marlon Aparecido Alves Martins, Neilton Paixão de Jesus Junior, S. P. Taguchi, Renata Nunes Oliveira, Rui de Góes Casqueira, Luiz Antônio Borges Júnior","doi":"10.4322/2176-1523.20212489","DOIUrl":"https://doi.org/10.4322/2176-1523.20212489","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20212498
Marcilho José Dias Vieira, M. Barros, J. Souza, Robson Ribeiro Lima
{"title":"Estudos de otimização do desmonte de rocha para abertura de poços rasos (shallow well)","authors":"Marcilho José Dias Vieira, M. Barros, J. Souza, Robson Ribeiro Lima","doi":"10.4322/2176-1523.20212498","DOIUrl":"https://doi.org/10.4322/2176-1523.20212498","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222434
Denilson Pereira de Melo, P. S. Moreira, Geraldo Lúcio de Faria
{"title":"Caracterização da ductilidade em fluência dos aços inoxidáveis AISI 321 e AISI 441 pela metodologia Sag Test","authors":"Denilson Pereira de Melo, P. S. Moreira, Geraldo Lúcio de Faria","doi":"10.4322/2176-1523.20222434","DOIUrl":"https://doi.org/10.4322/2176-1523.20222434","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222541
Ana Beatriz Moreira Silveira, D. Mazzinghy, Ricardo Augusto Martins Figueired
The growing perspective of mining tailings volume worldwide takes to a necessity of developing sustainable solutions to apply the concept of circular economy. Meanwhile, ordinary Portland cement (OPC) is the most consumed construction material globally, and its considerable CO2 emission abundantly contributes to greenhouse effect. Geopolymers are environmentally friendly materials that can be used as a sustainable alternative to OPC. This study proposes the development of a geopolymer cement containing iron ore tailings (IOT) and investigates the influence of the water/solid (W/S) ratio on their uniaxial compressive strength (UCS). The best result had a W/S ratio of 0.37 and achieved strength of 62.7 MPa after 28 days curing at room temperature, which is considerable higher than the required in the worldwide OPC standards. Also, the binder in this study has higher compressive strength after one day of cure than the regular OPC should have in 28 days of cure, showing high early strength. The result can be optimized for better economic viability in the future and shows that IOT has potential to be applied as filler in geopolymer cements.
{"title":"Developing a one-part geopolymer cement containing iron ore tailings from Minas Gerais state in Brazil","authors":"Ana Beatriz Moreira Silveira, D. Mazzinghy, Ricardo Augusto Martins Figueired","doi":"10.4322/2176-1523.20222541","DOIUrl":"https://doi.org/10.4322/2176-1523.20222541","url":null,"abstract":"The growing perspective of mining tailings volume worldwide takes to a necessity of developing sustainable solutions to apply the concept of circular economy. Meanwhile, ordinary Portland cement (OPC) is the most consumed construction material globally, and its considerable CO2 emission abundantly contributes to greenhouse effect. Geopolymers are environmentally friendly materials that can be used as a sustainable alternative to OPC. This study proposes the development of a geopolymer cement containing iron ore tailings (IOT) and investigates the influence of the water/solid (W/S) ratio on their uniaxial compressive strength (UCS). The best result had a W/S ratio of 0.37 and achieved strength of 62.7 MPa after 28 days curing at room temperature, which is considerable higher than the required in the worldwide OPC standards. Also, the binder in this study has higher compressive strength after one day of cure than the regular OPC should have in 28 days of cure, showing high early strength. The result can be optimized for better economic viability in the future and shows that IOT has potential to be applied as filler in geopolymer cements.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222656
J. Ferrari, Rosana Vilarim da Silva, Desílvia Machado Louzada, Iara Mendonça Tinti
Recycling electronic waste is one of the main environmental challenges faced by society today. In this sense, the purpose of this study is to evaluate the effect of using the residue of printed circuit boards (PCB) as a substitute for sand in mortars. The boards were taken from discarded electronic equipment and, to obtain the granular material, the boards, free of their components, were crushed. The residue obtained was sieved and separated into four granulometric ranges: # 1.2 mm; # 0.6 mm; # 0.3 mm and # 0.15 mm. Mortars were produced with partial replacement of 5% and 10% of the sand with the equivalent volume of residue in each of the size ranges, in addition to a reference mortar, without residue. For the characterization of the mortars, compressive strength, water absorption, percentage of voids and density tests were performed, in addition to analysis by scanning electron microscopy and environmental, leaching and solubilization, analyses. In general, the properties of the mortars, with the incorporation of the PCB residue, were not affected by the introduction of the residue, making its use feasible. However, as it is classified as non-inert in environmental analysis it is necessary to control its final disposal. Neste sentido, a proposta deste trabalho é avaliar o efeito do uso do resíduo de placas de circuito impresso (PCB), como substituto da areia em argamassas. As placas foram retiradas de equipamentos eletrônicos descartados e, para a obtenção do material granular, as placas, livres de seus componentes, foram trituradas. O resíduo obtido foi peneirado e separado em quatro faixas granulométricas: # 1.2 mm; # 0.6 mm; # 0.3 mm e # 0.15 mm. Foram produzidas argamassas com substituição parcial de 5% e 10% da areia pelo volume equivalente do resíduo de cada uma das faixas granulométricas, além de uma argamassa de referência. Para a caracterização das argamassas foram realizados ensaios de resistência à compressão, absorção de água, índice de vazios e densidade, além de análise por microscopia eletrônica de varredura e análises ambientais, de lixiviação e solubilização. As propriedades das argamassas com o resíduo de placa de circuito impresso não foram afetadas pela introdução do resíduo, viabilizando a utilização do mesmo. No entanto, por ser classificado como não inerte nas análises ambientais, segundo a norma NBR 10004:2004, é necessário controle na sua disposição final.
回收电子废物是当今社会面临的主要环境挑战之一。从这个意义上说，本研究的目的是评估使用印刷电路板(PCB)残留物作为砂浆中沙子的替代品的效果。这些电路板是从废弃的电子设备中提取的，为了获得颗粒状材料，电路板被粉碎，不含其组件。所得残渣经过筛分，分为4个粒度范围:# 1.2 mm;# 0.6 mm;0.3毫米和0.15毫米。在每个尺寸范围内，除了参考砂浆外，还使用同等体积的残留物部分替换5%和10%的砂来生产砂浆，没有残留物。为了对砂浆进行表征，除了扫描电子显微镜分析和环境、浸出和增溶分析外，还进行了抗压强度、吸水率、空隙率和密度测试。总的来说，掺入多氯联苯残渣的砂浆的性能不受掺入多氯联苯残渣的影响，因此使用多氯联苯是可行的。然而，由于它在环境分析中被归类为非惰性物质，因此有必要控制其最终处置。Neste sentido，是一项关于如何使用PCB (PCB)代替现有电路的建议。As placas foram retiradas de equipamentos eletrônicos descartados e, para a obteno do material granular, As placas, livres de seus components, foram trituradas。O resíduo目的:分离四分之一法氏颗粒:# 1.2 mm;# 0.6 mm;# 0.3 mm e # 0.15 mm有孔虫产豆豆豆豆网替代特别是5% - 10%的da -面积和个人体积等效于resíduo de cada uma das faxas granulomsamicacia, alaca de uma argamassa de referência。Para . a . a . o。正如我们所知道的那样，我们的生活方式将会变得更加丰富，我们的生活方式将会变得更加丰富，我们的生活方式将会变得更加丰富，我们的生活方式将会更加丰富。No entanto, bad ser classificado como o interinteras análises ambientais, secgundo a norma NBR 10004:2004， necessário control na suposiposi_dispos_final。
{"title":"Reuse of printed circuit boards substrate in the production of mortars","authors":"J. Ferrari, Rosana Vilarim da Silva, Desílvia Machado Louzada, Iara Mendonça Tinti","doi":"10.4322/2176-1523.20222656","DOIUrl":"https://doi.org/10.4322/2176-1523.20222656","url":null,"abstract":"Recycling electronic waste is one of the main environmental challenges faced by society today. In this sense, the purpose of this study is to evaluate the effect of using the residue of printed circuit boards (PCB) as a substitute for sand in mortars. The boards were taken from discarded electronic equipment and, to obtain the granular material, the boards, free of their components, were crushed. The residue obtained was sieved and separated into four granulometric ranges: # 1.2 mm; # 0.6 mm; # 0.3 mm and # 0.15 mm. Mortars were produced with partial replacement of 5% and 10% of the sand with the equivalent volume of residue in each of the size ranges, in addition to a reference mortar, without residue. For the characterization of the mortars, compressive strength, water absorption, percentage of voids and density tests were performed, in addition to analysis by scanning electron microscopy and environmental, leaching and solubilization, analyses. In general, the properties of the mortars, with the incorporation of the PCB residue, were not affected by the introduction of the residue, making its use feasible. However, as it is classified as non-inert in environmental analysis it is necessary to control its final disposal. Neste sentido, a proposta deste trabalho é avaliar o efeito do uso do resíduo de placas de circuito impresso (PCB), como substituto da areia em argamassas. As placas foram retiradas de equipamentos eletrônicos descartados e, para a obtenção do material granular, as placas, livres de seus componentes, foram trituradas. O resíduo obtido foi peneirado e separado em quatro faixas granulométricas: # 1.2 mm; # 0.6 mm; # 0.3 mm e # 0.15 mm. Foram produzidas argamassas com substituição parcial de 5% e 10% da areia pelo volume equivalente do resíduo de cada uma das faixas granulométricas, além de uma argamassa de referência. Para a caracterização das argamassas foram realizados ensaios de resistência à compressão, absorção de água, índice de vazios e densidade, além de análise por microscopia eletrônica de varredura e análises ambientais, de lixiviação e solubilização. As propriedades das argamassas com o resíduo de placa de circuito impresso não foram afetadas pela introdução do resíduo, viabilizando a utilização do mesmo. No entanto, por ser classificado como não inerte nas análises ambientais, segundo a norma NBR 10004:2004, é necessário controle na sua disposição final.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222667
J. Rocha, Junia Ananias, Geraldo Lúcio de Faria
{"title":"Avaliação da possibilidade de aplicação de tratamentos térmicos de múltiplas normalizações como mecanismo de refino microestrutural e incremento de propriedades mecânicas em aços API-OCTG","authors":"J. Rocha, Junia Ananias, Geraldo Lúcio de Faria","doi":"10.4322/2176-1523.20222667","DOIUrl":"https://doi.org/10.4322/2176-1523.20222667","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222676
Lys Daniele da Costa Tavares, P. R. Brandão
{"title":"Rejeito de minério de ferro depositado em barragem: caracterização para definição de processo para reciclagem econômica","authors":"Lys Daniele da Costa Tavares, P. R. Brandão","doi":"10.4322/2176-1523.20222676","DOIUrl":"https://doi.org/10.4322/2176-1523.20222676","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222638
R. Silveira, E. Angioletto, S. Arcaro, T. Gomes
{"title":"Nanopartículas de prata: síntese, atividade antibacteriana e comparativo com um desinfetante comum","authors":"R. Silveira, E. Angioletto, S. Arcaro, T. Gomes","doi":"10.4322/2176-1523.20222638","DOIUrl":"https://doi.org/10.4322/2176-1523.20222638","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4322/2176-1523.20222772
M. G. Zimmermann, E. Junca, Majorie Anacleto Bernardo, André Luis Catto, C. Borsoi
In this study, the effect of the use of foundry sand as a filler on the formation of different layer configurations in polyester/fiber glass composites was investigated. The composites were produced by hand lay-up lamination and their physical, mechanical and morphological properties were investigated. In the samples containing sand as the filler, the configuration of the layers affected the interface region of the phases, thus significantly affecting the mechanical properties of the samples. The morphological analysis of the composites revealed the presence of regions with moderate interaction between the phases (polyester / glass fiber and polyester / foundry sand), which can cause delamination of the layers and consequently the deterioration of the mechanical properties of the composites when compared to the composite without the sand.
{"title":"Development of unsaturated polyester/fiber glass composites with foundry sand","authors":"M. G. Zimmermann, E. Junca, Majorie Anacleto Bernardo, André Luis Catto, C. Borsoi","doi":"10.4322/2176-1523.20222772","DOIUrl":"https://doi.org/10.4322/2176-1523.20222772","url":null,"abstract":"In this study, the effect of the use of foundry sand as a filler on the formation of different layer configurations in polyester/fiber glass composites was investigated. The composites were produced by hand lay-up lamination and their physical, mechanical and morphological properties were investigated. In the samples containing sand as the filler, the configuration of the layers affected the interface region of the phases, thus significantly affecting the mechanical properties of the samples. The morphological analysis of the composites revealed the presence of regions with moderate interaction between the phases (polyester / glass fiber and polyester / foundry sand), which can cause delamination of the layers and consequently the deterioration of the mechanical properties of the composites when compared to the composite without the sand.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：