Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores
Simple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent...
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doaj-3979b34357e54f878d705b4db3465cd02020-11-24T21:58:37ZengMDPI AGMinerals2075-163X2016-08-01638610.3390/min6030086min6030086Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite OresTao Su0Tiejun Chen1Yimin Zhang2Peiwei Hu3College of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, ChinaCollege of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, ChinaCollege of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, ChinaCollege of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, ChinaSimple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent sizes of target mineral particles, and improve the separation indices, by using a multi-stage grinding-dispersion-selective flocculation-weak magnetic separation process. The results showed that under the conditions of 500 g/t sodium hexametaphospate (SHMP) as dispersant, 750 g/t carboxymethyl starch (CMS) as flocculant, agitating at 400 rpm for 10 min, with slurry pH 11, and final grinding fineness of 93.5% less than 0.03 mm, the obtained concentrate contained 62.82% iron, with recovery of 79.12% after multi-stage magnetic separation. Compared to simple magnetic separation, the concentrate’s iron grade increased by 1.26%, and a recovery rate by 5.08%. Fundamental analysis indicated that, in a dispersed state of dispersion, magnetite particles had weaker negative surface charges than quartz, allowing the adsorption of negative CMS ions via hydrogen bonding. Consequently, the aggregate size of the initial concentrate increased from 24.30 to 38.37 μm, accomplishing the goal of selective flocculation, and increasing the indices of separation.http://www.mdpi.com/2075-163X/6/3/86magnetiteultrafine disseminationmagnetic separationselective flocculation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tao Su Tiejun Chen Yimin Zhang Peiwei Hu |
spellingShingle |
Tao Su Tiejun Chen Yimin Zhang Peiwei Hu Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores Minerals magnetite ultrafine dissemination magnetic separation selective flocculation |
author_facet |
Tao Su Tiejun Chen Yimin Zhang Peiwei Hu |
author_sort |
Tao Su |
title |
Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores |
title_short |
Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores |
title_full |
Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores |
title_fullStr |
Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores |
title_full_unstemmed |
Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores |
title_sort |
selective flocculation enhanced magnetic separation of ultrafine disseminated magnetite ores |
publisher |
MDPI AG |
series |
Minerals |
issn |
2075-163X |
publishDate |
2016-08-01 |
description |
Simple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent sizes of target mineral particles, and improve the separation indices, by using a multi-stage grinding-dispersion-selective flocculation-weak magnetic separation process. The results showed that under the conditions of 500 g/t sodium hexametaphospate (SHMP) as dispersant, 750 g/t carboxymethyl starch (CMS) as flocculant, agitating at 400 rpm for 10 min, with slurry pH 11, and final grinding fineness of 93.5% less than 0.03 mm, the obtained concentrate contained 62.82% iron, with recovery of 79.12% after multi-stage magnetic separation. Compared to simple magnetic separation, the concentrate’s iron grade increased by 1.26%, and a recovery rate by 5.08%. Fundamental analysis indicated that, in a dispersed state of dispersion, magnetite particles had weaker negative surface charges than quartz, allowing the adsorption of negative CMS ions via hydrogen bonding. Consequently, the aggregate size of the initial concentrate increased from 24.30 to 38.37 μm, accomplishing the goal of selective flocculation, and increasing the indices of separation. |
topic |
magnetite ultrafine dissemination magnetic separation selective flocculation |
url |
http://www.mdpi.com/2075-163X/6/3/86 |
work_keys_str_mv |
AT taosu selectiveflocculationenhancedmagneticseparationofultrafinedisseminatedmagnetiteores AT tiejunchen selectiveflocculationenhancedmagneticseparationofultrafinedisseminatedmagnetiteores AT yiminzhang selectiveflocculationenhancedmagneticseparationofultrafinedisseminatedmagnetiteores AT peiweihu selectiveflocculationenhancedmagneticseparationofultrafinedisseminatedmagnetiteores |
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1725851119981166592 |