Mario Menéndez, Malcolm Gent, Susana Torno, Nerea Crespo
{"title":"用于研磨晶粒的键合功指数磨球装料和闭合筛网产品尺寸分布","authors":"Mario Menéndez, Malcolm Gent, Susana Torno, Nerea Crespo","doi":"10.1016/j.minpro.2017.05.011","DOIUrl":null,"url":null,"abstract":"<div><p>Ball mill charge size distributions originally specified for Bond grindability tests to determine the Bond Work index (BWi) are not commercially available. Those proposed to date do not match all of Bond's (1961) original specifications of total ball mass, number and surface area. An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area.</p><p><span>Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite<span> (feldspar), quartz, andalusite and glass) using closing screen apertures (P</span></span><sub>1</sub>) values of 500, 250, 125, 90 and 63<!--> <!-->μm are analysed. The samples were selected on the basis of having distinct hardness's (Mohs hardness 3 to 7.5), being relatively free of crystallographic defects and having distinct cleavage properties The 80 percentile size of the fines produced (P<sub>80</sub>) concur with those of published values.</p><p>The trend based of P<sub>80</sub> values for P<sub>1</sub> values of 150 to 44<!--> <!-->μm recommended by Bond poorly fit with published P<sub>1</sub> values ><!--> <!-->250<!--> <!-->μm. It is demonstrated that the BWi test P<sub>1</sub> values of mono-mineralogical or mono-material samples determines the P<sub>80</sub> value obtained. Based on test results of this investigation a polynomial exponential equation relating P<sub>80</sub> to P<sub>1</sub> values with an R<sup>2</sup> correlation factor of 0.9977 is presented. This relation is independent of the tested material hardness and crystallographic defects and planes of weakness.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2017-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.05.011","citationCount":"2","resultStr":"{\"title\":\"A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains\",\"authors\":\"Mario Menéndez, Malcolm Gent, Susana Torno, Nerea Crespo\",\"doi\":\"10.1016/j.minpro.2017.05.011\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Ball mill charge size distributions originally specified for Bond grindability tests to determine the Bond Work index (BWi) are not commercially available. Those proposed to date do not match all of Bond's (1961) original specifications of total ball mass, number and surface area. An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area.</p><p><span>Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite<span> (feldspar), quartz, andalusite and glass) using closing screen apertures (P</span></span><sub>1</sub>) values of 500, 250, 125, 90 and 63<!--> <!-->μm are analysed. The samples were selected on the basis of having distinct hardness's (Mohs hardness 3 to 7.5), being relatively free of crystallographic defects and having distinct cleavage properties The 80 percentile size of the fines produced (P<sub>80</sub>) concur with those of published values.</p><p>The trend based of P<sub>80</sub> values for P<sub>1</sub> values of 150 to 44<!--> <!-->μm recommended by Bond poorly fit with published P<sub>1</sub> values ><!--> <!-->250<!--> <!-->μm. It is demonstrated that the BWi test P<sub>1</sub> values of mono-mineralogical or mono-material samples determines the P<sub>80</sub> value obtained. Based on test results of this investigation a polynomial exponential equation relating P<sub>80</sub> to P<sub>1</sub> values with an R<sup>2</sup> correlation factor of 0.9977 is presented. This relation is independent of the tested material hardness and crystallographic defects and planes of weakness.</p></div>\",\"PeriodicalId\":14022,\"journal\":{\"name\":\"International Journal of Mineral Processing\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2017-08-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/j.minpro.2017.05.011\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Mineral Processing\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S030175161730114X\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Earth and Planetary Sciences\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Mineral Processing","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S030175161730114X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}
A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains
Ball mill charge size distributions originally specified for Bond grindability tests to determine the Bond Work index (BWi) are not commercially available. Those proposed to date do not match all of Bond's (1961) original specifications of total ball mass, number and surface area. An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area.
Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P1) values of 500, 250, 125, 90 and 63 μm are analysed. The samples were selected on the basis of having distinct hardness's (Mohs hardness 3 to 7.5), being relatively free of crystallographic defects and having distinct cleavage properties The 80 percentile size of the fines produced (P80) concur with those of published values.
The trend based of P80 values for P1 values of 150 to 44 μm recommended by Bond poorly fit with published P1 values > 250 μm. It is demonstrated that the BWi test P1 values of mono-mineralogical or mono-material samples determines the P80 value obtained. Based on test results of this investigation a polynomial exponential equation relating P80 to P1 values with an R2 correlation factor of 0.9977 is presented. This relation is independent of the tested material hardness and crystallographic defects and planes of weakness.
期刊介绍：
International Journal of Mineral Processing has been discontinued as of the end of 2017, due to the merger with Minerals Engineering.
The International Journal of Mineral Processing covers aspects of the processing of mineral resources such as: Metallic and non-metallic ores, coals, and secondary resources. Topics dealt with include: Geometallurgy, comminution, sizing, classification (in air and water), gravity concentration, flotation, electric and magnetic separation, thickening, filtering, drying, and (bio)hydrometallurgy (when applied to low-grade raw materials), control and automation, waste treatment and disposal. In addition to research papers, the journal publishes review articles, technical notes, and letters to the editor..
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