scholarly journals A comparison of pollen extraction methods confirms dense-media separation as a reliable method of pollen preparation

2016 ◽  
Vol 31 (6) ◽  
pp. 631-640 ◽  
Author(s):  
J. F. E. Campbell ◽  
W. J. Fletcher ◽  
P. D. Hughes ◽  
E. L. Shuttleworth
Keyword(s):  
Reliable Method ◽  
Extraction Methods ◽  
Dense Media ◽  
Dense Media Separation

Study on a Sink and Float Test of a Lead-Zinc Ore from Yunnan

2014 ◽  
Vol 1073-1076 ◽  
pp. 2149-2152
Author(s):  
Wen Juan Zhao ◽  
Sheng Jian
Keyword(s):  
Specific Gravity ◽  
Light Product ◽  
Lead Recovery ◽  
Dense Media ◽  
Lead Zinc ◽  
Dense Media Separation

The paper analyses problems of a lead-zinc ore from Yunnan with a sink and float test. In the paper, we explored the possibility of pre-discarding about the ore by dense-media process. Dense liquids with the specific gravity of 2.6, 2.7 and 2.8 were used in the test, respectively. -12mm crudes were taken into the test. Finally, it revealed that pre-discarding by dense-media separation can be used in the ore. 2.7 was taken as the best specific gravity of separation. 12~1mm was used as the optimal fraction of pre-discarding by dense-media separation. Pre-discarding rate was 45.53%. The light product with a lead grade of 0.29% and a lead recovery of 4.29% was pre-discarded in which the grade and recovery of zinc were 0.22 and 5.84, respectively.

Dense-media separation as a more efficient pollen extraction method for use with organic sediment/deposit samples: comparison with the conventional method

Boreas ◽  
2008 ◽  
Vol 27 (1) ◽  
pp. 15-24 ◽  
Author(s):  
TAKESHI NAKAGAWA ◽  
ELISABETTA BRUGIAPAGLIA ◽  
GUNNAR DIGERFELDT ◽  
MAURICE REILLE ◽  
JACQUES-LOUIS DE BEAULIEU ◽  
...  
Keyword(s):  
Conventional Method ◽  
Extraction Method ◽  
Organic Sediment ◽  
Dense Media ◽  
Dense Media Separation ◽  
Sediment Deposit

Pb–Zn mine tailings reprocessing using centrifugal dense media separation

2019 ◽  
Vol 131 ◽  
pp. 28-37 ◽  
Author(s):  
A. Khalil ◽  
R. Argane ◽  
M. Benzaazoua ◽  
H. Bouzahzah ◽  
Y. Taha ◽  
...  
Keyword(s):  
Mine Tailings ◽  
Dense Media ◽  
Dense Media Separation

scholarly journals The Recovery and Concentration of Spodumene Using Dense Media Separation

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 649
Author(s):  
Charlotte E. Gibson ◽  
Massoud Aghamirian ◽  
Tassos Grammatikopoulos ◽  
Darren L. Smith ◽  
Lindsay Bottomer
Keyword(s):  
Sensitivity Analysis ◽  
Potential Role ◽  
Hard Rock ◽  
Dense Media ◽  
Original Mass ◽  
Electric Vehicle Adoption ◽  
Concentrate Grade ◽  
Expected Increase ◽  
Dense Media Separation

In coming years, global lithium production is expected to increase as the result of widespread electric vehicle adoption. To meet the expected increase in demand, lithium must be sourced from both brine and hard-rock deposits. Heavy liquid separation (HLS) and dense media separation (DMS) tests were conducted on the pegmatites from Hidden Lake, NWT, Canada to demonstrate the potential role of this technology in the concentration of spodumene (LiAlSi2O6) from hard-rock sources. A continuously operated DMS circuit test, conducted on +840 µm material, produced a concentrate grading 6.11% Li2O with ~50% lithium recovery. The circuit rejected 50% of the original mass to tailings, with only 8% lithium losses. Sensitivity analysis showed that minor changes (+/−0.05) in the DMS-specific gravity cut point resulted in significant changes to the mass rejected and to the concentrate grade produced; this may limit the feasibility and operability of the downstream grinding and flotation circuits. The results demonstrate the potential for DMS in the concentration of spodumene from the Hidden Lake pegmatites, and by extension, the potential for DMS in the concentration of spodumene from other hard-rock occurrences.

Quantitative Diameter Measurements of Chromatin and TMV Fibers in the Freeze-Dried State

1988 ◽  
Vol 46 ◽  
pp. 170-171
Author(s):  
B. D. Athey ◽  
A. L. Stout ◽  
M. F. Smith ◽  
J. P. Langmore
Keyword(s):  
Reliable Method ◽  
Fiber Diameter ◽  
Quantitative Agreement ◽  
One Dimension ◽  
Fiber Axis ◽  
Two Dimensional ◽  
Fiber Density ◽  
Variable Diameter ◽  
Freeze Dried ◽  
Expected Values

Although there is general agreement that Inactive chromosome fibers consist of helically packed nucleosomes, the pattern of packing is still undetermined. Only one of the proposed models, the crossed-linker model, predicts a variable diameter dependent on the length of DNA between nucleosomes. Measurements of the fiber diameter of negatively-stained and frozen- hydrated- chromatin from Thyone sperm (87bp linker) and Necturus erythrocytes (48bp linker) have been previously reported from this laboratory. We now introduce a more reliable method of measuring the diameters of electron images of fibrous objects. The procedure uses a modified version of the computer program TOTAL, which takes a two-dimensional projection of the fiber density (represented by the micrograph itself) and projects it down the fiber axis onto one dimension. We illustrate this method using high contrast, in-focus STEM images of TMV and chromatin from Thyone and Necturus. The measured diameters are in quantitative agreement with the expected values for the crossed-linker model for chromatin structure

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