Jingfeng He , Hailong Tang , Chengjing Guo , Lingtao Zhu , Shibo Huang , Bin Yang
{"title":"通过旋转三电分离和表面改性协同提高石墨矿石的有效脱硅能力","authors":"Jingfeng He , Hailong Tang , Chengjing Guo , Lingtao Zhu , Shibo Huang , Bin Yang","doi":"10.1016/j.powtec.2024.119965","DOIUrl":null,"url":null,"abstract":"<div><p>Desilication of graphite ores helps to ensure their high-value applications. Surface modification and triboelectric separation methods were used to improve the desilication of graphite ore. Effects of friction media and chemicals on the charge properties of graphite and quartz were investigated by charge-to-mass ratio tests and the adsorption mechanism was analyzed. Furthermore, effects of electrode voltage and rotational speed on the desilication of graphite ore were investigated. The results showed that polyvinyl chloride was the best friction medium for graphite and quartz, and the charging effect of kerosene-modified graphite and quartz was better than that of ethanol. Kerosene modification made graphite more positively charged and quartz more negatively charged, enlarging the charge-to-mass ratio gap. Desilication efficiencies of 0.25–0.5 mm, 0.125–0.25 mm, and 0.074–0.125 mm graphite ores after kerosene modification were 42.27% (20.20% increase), 48.92% (17.18% increase), and 57.26% (19.92% increase), respectively. Our study provides guidance for the purification of graphite.</p></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.5000,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synergist enhancement of effective desilication of graphite ore by rotary triboelectric separation and surface modification\",\"authors\":\"Jingfeng He , Hailong Tang , Chengjing Guo , Lingtao Zhu , Shibo Huang , Bin Yang\",\"doi\":\"10.1016/j.powtec.2024.119965\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Desilication of graphite ores helps to ensure their high-value applications. Surface modification and triboelectric separation methods were used to improve the desilication of graphite ore. Effects of friction media and chemicals on the charge properties of graphite and quartz were investigated by charge-to-mass ratio tests and the adsorption mechanism was analyzed. Furthermore, effects of electrode voltage and rotational speed on the desilication of graphite ore were investigated. The results showed that polyvinyl chloride was the best friction medium for graphite and quartz, and the charging effect of kerosene-modified graphite and quartz was better than that of ethanol. Kerosene modification made graphite more positively charged and quartz more negatively charged, enlarging the charge-to-mass ratio gap. Desilication efficiencies of 0.25–0.5 mm, 0.125–0.25 mm, and 0.074–0.125 mm graphite ores after kerosene modification were 42.27% (20.20% increase), 48.92% (17.18% increase), and 57.26% (19.92% increase), respectively. Our study provides guidance for the purification of graphite.</p></div>\",\"PeriodicalId\":407,\"journal\":{\"name\":\"Powder Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.5000,\"publicationDate\":\"2024-06-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Powder Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0032591024006089\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591024006089","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Synergist enhancement of effective desilication of graphite ore by rotary triboelectric separation and surface modification
Desilication of graphite ores helps to ensure their high-value applications. Surface modification and triboelectric separation methods were used to improve the desilication of graphite ore. Effects of friction media and chemicals on the charge properties of graphite and quartz were investigated by charge-to-mass ratio tests and the adsorption mechanism was analyzed. Furthermore, effects of electrode voltage and rotational speed on the desilication of graphite ore were investigated. The results showed that polyvinyl chloride was the best friction medium for graphite and quartz, and the charging effect of kerosene-modified graphite and quartz was better than that of ethanol. Kerosene modification made graphite more positively charged and quartz more negatively charged, enlarging the charge-to-mass ratio gap. Desilication efficiencies of 0.25–0.5 mm, 0.125–0.25 mm, and 0.074–0.125 mm graphite ores after kerosene modification were 42.27% (20.20% increase), 48.92% (17.18% increase), and 57.26% (19.92% increase), respectively. Our study provides guidance for the purification of graphite.
期刊介绍：
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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