Current Works in Mineral Processing最新文献

{"title":"Safer Frother Option for Coal Flotation – A Review","authors":"A. Otsuki, T. Miller","doi":"10.22606/cwimp.2019.11003","DOIUrl":"https://doi.org/10.22606/cwimp.2019.11003","url":null,"abstract":"A safer frother option for coal flotation in comparison with the common frother methyl isobutyl carbinol (MIBC) was searched and compared through literature review. Results of literature review and comparison of different frothers in safety and environmental aspects show that pine oil and DowFroth have a strong potential to replace MIBC since it has high flash point (78 °C, 149 °C, respectively), and dual frothing and collecting properties to be used as a stand-alone reagent for coal flotation. It can significantly reduce the risk of potential hazard associated with MIBC and oil collector.","PeriodicalId":282007,"journal":{"name":"Current Works in Mineral Processing","volume":"8 Suppl 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128142379","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}

{"title":"Review on the Applications of Apparent Mean Shape Factor on the Integration of Coarse and Fine PSDs Measured by Different Techniques: Quartz Example","authors":"Ugur Ulusoy, M. Yekeler, O. Y. Gülsoy, N. Aydogan, C. Biçer, Z. Gülsoy","doi":"10.22606/cwimp.2019.11004","DOIUrl":"https://doi.org/10.22606/cwimp.2019.11004","url":null,"abstract":"In most industry where grinding is utilized, particle size, which is a decisive element in establishing the productivity of production processes and execution of the end product, is analyzed to describe the size distribution of particles in a given sample. In mineral and coal processing, particle size distributions (PSDs) of particulate materials were traditionally accomplished by sieving, which gives inaccurate particle size and PSD below 38 μm. This paper reviews the studies related to the combinations PSDs of different mill products of the same quartz mineral by using different particle size measurement techniques to build the whole PSDs including coarse and fine PSDs. For this purpose, almost pure quartz mineral (which is the most suitable brittle material that gives first order grinding kinetics) ground by ball and rod mill products that are the most widely used conventional mills in mineral processing were measured by different size analysis techniques, i.e. sieving for coarse sizes, Andreasen pipette sedimentation, and laser diffraction for fine sizes below 38 μm and combined them to construct whole size distribution by using apparent mean shape factor, r. The results were satisfactorily well for both cases; PSDs by laser diffraction size distributionsieving and PSDs by Andreasen pipette sedimentation-sieving, i.e., a smooth overlap of corrected laser diffraction and sieving PSDs and Andreasen pipette sedimentation and sieving PSDs were obtained by applying to the particle size distribution with r shifting to the right side of the curves. In the case of determination of PSDs by laser diffraction and sieving, r values determined from the corrected particle size distributions were found to be 1.29 and 1.25 for ball and rod milled products, respectively. The results indicates that there is not significant differences between the shape factors of ball and rod milled products of quartz mineral, i.e. both of them have irregular particles, which deviates from the spherical shape as proved by their SEM microphotographs. On the other hand, for the PSDs by Andreasen pipette sedimentation and sieving, the corrected sedimentation data came closer to the sieving data. It was found that r values determined from the corrected PSDs of the same quartz mineral ground by ball and rod mill were 1.00 and 1.12, respectively. The results show that the rod milled products were not more regular in shape than ball milled products as evidenced by SEM pictures and previous works. Thus, this approach can be utilized for the integration of PSDs analyzed by different techniques for coarse and fine sizes of fine particulate coals, minerals, and similar materials ground finely.","PeriodicalId":282007,"journal":{"name":"Current Works in Mineral Processing","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124076682","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}

{"title":"Experimental Investigation on Safer Frother Option for Coal Flotation","authors":"A. Otsuki, T. Miller","doi":"10.22606/cwimp.2019.11001","DOIUrl":"https://doi.org/10.22606/cwimp.2019.11001","url":null,"abstract":"This work aimed to investigate a safer frother for coal flotation with achieving similar or better flotation performance, compared with the most common frother methyl isobutyl carbinol (MIBC) that caused some fire hazards in the past due to its low flash point (F.P. = 39 °C). Based on the higher flash points and low risk rating according to their safety data sheet, Dow Froth 250 (F.P. = 149 °C) and pine oil (F.P. = 78 °C) were selected to test against MIBC. Flotation tests were carried out at various frother dosages with/without diesel as a collector. Both Dow Froth 250 and pine oil had a good potential to be a safer alternative to MIBC in terms of coal grade and recovery. Pine oil was the most promising as a stand-alone reagent without a collector potentially making for a safer work environment with less chemical storage.","PeriodicalId":282007,"journal":{"name":"Current Works in Mineral Processing","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124013962","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}

{"title":"UV-Vis Study of Mixed Collector Adsorption on Pyrite towards the Better Understanding of the Adsorption Mechanism","authors":"A. Otsuki, Yihong Zhao","doi":"10.22606/cwimp.2019.11002","DOIUrl":"https://doi.org/10.22606/cwimp.2019.11002","url":null,"abstract":"This paper discusses the primary collector adsorption onto a sulphide mineral in mixed collector systems to further understand its adsorption mechanism. UV-Vis measurements were performed to identify the primary collector concentration adsorbed on pyrite, and the adsorption kinetics under different conditions were compared to distinguish their difference between single and mixed collector systems. Small amount of secondary collector addition prior to the primary collector addition significantly improved the adsorption kinetics of primary one. The result was explained by the combination of two previously proposed mechanisms (i.e., different adsorption site mechanism and multi-layer product mechanism). This study showed UV-Vis measurement as an effective tool to study mixed collector adsorption behavior.","PeriodicalId":282007,"journal":{"name":"Current Works in Mineral Processing","volume":"429 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116001856","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}