Rem-Revista Escola De Minas最新文献_第2页

Mine/Mill production planning based on a Geometallurgical Model 基于地质冶金模型的矿厂生产计划

Rem-Revista Escola De Minas Pub Date : 2016-06-01 DOI: 10.1590/0370-44672015690173

R. Gomes, G. Tomi, P. Assis

引用次数: 5

Performance analysis of the HRCTM HPGR in pilot plant 中试装置HRCTM HPGR性能分析

Rem-Revista Escola De Minas Pub Date : 2016-06-01 DOI: 10.1590/0370-44672015690124

R. Oliveira, H. D. Júnior, M. G. Bergerman

引用次数: 4

Principal environmental impacts on pipeline tracks as a result of mining operations and their mitigated actions 采矿作业对管道轨道造成的主要环境影响及其缓解措施

Rem-Revista Escola De Minas Pub Date : 2016-04-01 DOI: 10.1590/0370-44672015690152

Gilda Carneiro Ferreira, Maria Rita Caetano Chang, C. Lemos

引用次数: 0

Cost modelling of the product mix from mining operations using the activity-based costing approach 采用作业成本法对采矿作业的产品组合进行成本建模

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690137

D. Cremonese, G. Tomi, Manoel Neves

引用次数: 8

An Analysis of the Rate for Controlling, Monitoring and Supervision of Exploration and Mining Activities of Mineral Resources (TFRM) 矿产资源勘查开采活动控制、监测和监督费率分析

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690032

Camila Cardoso Takano, José Cruz do Carmo Flores, H. Lima

{"title":"An Analysis of the Rate for Controlling, Monitoring and Supervision of Exploration and Mining Activities of Mineral Resources (TFRM)","authors":"Camila Cardoso Takano, José Cruz do Carmo Flores, H. Lima","doi":"10.1590/0370-44672015690032","DOIUrl":"https://doi.org/10.1590/0370-44672015690032","url":null,"abstract":"Recently, the Brazilian media reported the withdrawal of the rate on profit from mining of coal and iron ore by the government of Australia. In Australia this rate was created in 2012 to finance social programs. However, due to the drop in the value of mineral commodities, the government has reversed this trend and seeks to quash the law that created such a rate, while keeping its social program financial support. One can observe the opposite in Brazil, where the states of Minas Gerais, Para, Amapa and Mato Grosso do Sul, created the Rate for Controlling, Monitoring and Supervision of Exploration and Mining Activities of Mineral Resources (TFRM). These states' rates have been grounds for numerous political, economic, administrative and legal discussions. This paper presents an analysis of state laws that created the TFRM, examines the ways taken by mining companies to question the constitutionality of these laws and concludes that the levy of TFRM breaks the principle of equality, penalizes mining, violates the precept contained in article 152 the Federal Constitution of 1988 and helps reduce the competitiveness of Brazilian mining.","PeriodicalId":54498,"journal":{"name":"Rem-Revista Escola De Minas","volume":"115 1","pages":"105-110"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87603854","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}

引用次数: 4

Development of ball mill test for simulation of industrial circuit 工业电路仿真球磨机试验的研制

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690001

W. L. Gomes, H. D. Júnior, A. C. Chieregati, T. Jatobá

引用次数: 1

Concentration of manganese tailings via reverse flotation in an acid médium 在酸性介质中反浮选富集锰尾矿

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690069

Helder Silva Souza, A. S. Braga, Arildo Henrique de Oliveira, L. S. L. Filho

{"title":"Concentration of manganese tailings via reverse flotation in an acid médium","authors":"Helder Silva Souza, A. S. Braga, Arildo Henrique de Oliveira, L. S. L. Filho","doi":"10.1590/0370-44672015690069","DOIUrl":"https://doi.org/10.1590/0370-44672015690069","url":null,"abstract":"Beneficiation of manganese ores has been conducted around the world by circuits composed basically of crushing, screening and spiral classifier. Therefore, solely the coarse size fractions (and commonly the richest) are actually recovered: \"lump\" (-75+9mm) and \"sinter feed\" (-9+0.15mm). In the industrial plant which processes the ore from the Azul Mine-PA, the overflow of the spiral classifier (- 0.15mm) is disposed of in a tailings dam because it bears a low Mn content (<10%) and high kaolinite content (70%). This paper reports the findings of a process development conducted on laboratory scale with the aim of concentrating Mn-bearing minerals from the tailings of the Azul Mine-PA (7% of Mn and 70% of kaolinite). The process is composed of desliming (-10µm), followed by reverse cationic flotation of kaolinite (rougher, scavenger) at pH~5. Results indicate that the reverse cationic flotation in the acid medium, when utilizing amide amine as collector and in the presence of a silicate activator and a dispersing agent could be a possible route for the concentration of tailings that had previously been deslimed at 10µm. The results yielded a mass recovery of 18%, a metallurgical recovery of 50% and a 32% Mn concentrate which may be mixed with current high grade products, increasing the overall recovery of the plant.","PeriodicalId":54498,"journal":{"name":"Rem-Revista Escola De Minas","volume":"10 1","pages":"85-90"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81029231","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}

引用次数: 6

Regression model utilization to estimate the mass recovery of a phosphate mine in Brazil 运用回归模型估算巴西某磷矿的质量回收率

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690155

Fernanda Gontijo Fernandes, I. E. Cabral

引用次数: 2

Numerical study of the influence of internal heat source in naturally ventilated offices 自然通风办公室内热源影响的数值研究

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690099

Luiz J. C. Rocha, H. A. Souza

{"title":"Numerical study of the influence of internal heat source in naturally ventilated offices","authors":"Luiz J. C. Rocha, H. A. Souza","doi":"10.1590/0370-44672015690099","DOIUrl":"https://doi.org/10.1590/0370-44672015690099","url":null,"abstract":"The natural ventilation in a building performs a fundamental role in users' welfare and health, when used as a bioclimatic and architectural strategy, it can provide brighter projects. Increasing the indoor air speed ventilation has an important performance maintaining indoor air quality, contributing to thermal interactions between human body and environment, which can significantly reduce the building's energy cost. In this study, a numerical research of natural convection in single-sided and cross ventilation is developed using the finite volume method, taking account the internal heat sources influence. The numerical model is used to determine the effects of wind and thermal forces combined by analyzing the stream functions and temperature distribution within an office. The turbulence model is the two differential equations for the low Reynolds number. The building's internal heat sources influence is analyzed herein. The results show that the single-sided ventilation presents excellent conformity with the results obtained in literature. The influence of the internal heat source is considered and it has been observed that the best source position is near to the air exit for both single-sided ventilation and cross ventilation.","PeriodicalId":54498,"journal":{"name":"Rem-Revista Escola De Minas","volume":"37 1-2","pages":"45-51"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/0370-44672015690099","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72479781","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}

引用次数: 3

Structural analyses of reinforced tubular T-joints 钢筋管型t形接头的结构分析

Rem-Revista Escola De Minas Pub Date : 2016-03-01 DOI: 10.1590/0370-44672015690107

Douglas Brasil, L. Lima, P. Vellasco, A. Silva

{"title":"Structural analyses of reinforced tubular T-joints","authors":"Douglas Brasil, L. Lima, P. Vellasco, A. Silva","doi":"10.1590/0370-44672015690107","DOIUrl":"https://doi.org/10.1590/0370-44672015690107","url":null,"abstract":"The use of rolled hollow sections has been substantially boosted mainly due to the advantages associated with structural behavior and aesthetics, leading to an intense use in Europe, Southeast Asia, North America, Australia, and now, in Brazil due to the wider supply of these profiles. Therefore, it is important to investigate the structural behavior in order to provide an adequate structural design for the civil engineering community. Thus, this paper presents a parametric analysis of a reinforced T-joint focused on NBR 16239 provisions. Two types of reinforcement plates: Collar and Double were investigated. A wide set of numerical models has been defined varying the thickness of the reinforcing plate, chord and brace members and axial loads applied in the brace. The numerical models have been developed using ANSYS 12.0 software considering both geometrical and material non-linearity. Concerning the results, there was a slight gain of resistance when a double plate reinforcement was used, mainly for small displacement, due to large stiffness provided and a linear response up to the serviceability limit. In addition, Von Mises stress distribution confirmed the type A failure with chord yielding beginning at the upper chord surface. Comparing the numerical results with NBR 16239 provisions, an excessive conservatism was noted for this code. In fact, the Brazilian code only takes into account the reinforcement thickness in joint resistance. However, when the results provided by the new proposal where both thicknesses (chord and reinforcement) are considered, a more realistic assessment of the joint capacity is obtained.","PeriodicalId":54498,"journal":{"name":"Rem-Revista Escola De Minas","volume":"8 1","pages":"13-19"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74291567","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}

引用次数: 2