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

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.

scholarly journals Comparison of charantin extract from Momordica Charantia using modified supercritical carbon dioxide and soxhlet extraction method

2018 ◽  
Vol 14 (4) ◽  
pp. 462-466 ◽  
Author(s):  
Ahmad Syahmi Zaini ◽  
Noor Aiysah Aris ◽  
Nicky Rahmana Putra ◽  
Syafiza Abd Hashib ◽  
Mohd Johari Kamaruddin ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Conventional Method ◽  
Extraction Method ◽  
High Performance ◽  
Soxhlet Extraction ◽  
Momordica Charantia ◽  
Water Bath ◽  
Distilled Water ◽  
Purification Step ◽  
Promising Alternative

Charantin extract from Momordica Charantia fruits for anti-diabetic compound was proposed via Supercritical Fluid Extraction using carbon dioxide (SC-CO2) as solvent. This method is a promising alternative technique to a conventional Soxhlet and shaking water bath extraction method. Experiments were conducted to analyze the charantin i) with and without modifier (ethanol), ii) Soxhlet extraction with four types of solvent (distilled water, ethanol, dichloromethane, and petroleum ether) and iii) shaking water bath with distilled water as a solvent. A purification step was conducted post extraction to remove intrusive components such as chlorophylls and sugar from analyte in order to quantify charantin extract using high performance liquid chromatography (HPLC). The results show that, in 2.5 hours SC-CO2 with ethanol as modifier gives highest charantin yield with 0.7817 mg charantin per gram sample. In contrast, shaking water bath gives the highest charantin yield for conventional method with 0.712 mg charantin per gram sample during 6 hours of extraction. The result shows that by using SC-CO2 modified with ethanol can be a promising “green” extraction than conventional method.

Speech extraction with RGB-intensity gradient on rolling-shutter video

2021 ◽  
Vol 263 (5) ◽  
pp. 1095-1106
Author(s):  
Tsubasa Yoshizawa ◽  
Atsushi Yoshida ◽  
Kenta Iwai ◽  
Takanobu Nishiura
Keyword(s):  
Conventional Method ◽  
Extraction Method ◽  
Dynamic Range ◽  
Experimental Results ◽  
Sound Waves ◽  
Intensity Gradient ◽  
Equipment Cost ◽  
Single Lens ◽  
Phase Images ◽  
Speech Extraction

Recent studies have been proposed to extract speech from the captured video of objects vibrating by sound waves. Among them, from the viewpoint of equipment cost, the method of extracting speech from the video captured by rolling-shutter cameras, which are widely used in consumer digital single-lens reflex cameras, has been attracting attention. The conventional method with the rolling-shutter video uses a grayscale video for processing based on phase images. However, a grayscale video has a smaller dynamic range than an RGB video, and thus the speech extraction accuracy of the conventional method degrades. Therefore, this paper proposes a speech extraction method based on RGB-intensity gradients on an RGB video to improve speech extraction accuracy. The proposed method extracts the speech by calculating the similarity of R, G, and B intensity gradients, and using these three intensity gradients expands the dynamic range. The experimental results on the quality and intelligibility of the extracted speech show our proposed method outperforms the conventional method.

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.

scholarly journals Aplikasi Microwave Hydrodistillation pada Ekstraksi Biji Kapulaga

2020 ◽  
Vol 4 (2) ◽  
pp. 168
Author(s):  
Y. Tri Rahkadima ◽  
Anggun Fitria Laila Ningsih ◽  
Medya Ayunda Fitri
Keyword(s):  
Essential Oils ◽  
Conventional Method ◽  
Extraction Method ◽  
Soxhlet Extraction ◽  
Extraction Time ◽  
Alternative Methods ◽  
Distilled Water ◽  
Distillation Method ◽  
Extraction Processes ◽  
Conventional Extraction

Minyak Atsiri dari kapulaga memiliki banyak manfaat dibidang industri maupun kesehatan. Metode alternatif diperlukan untuk mengoptimalkan kualitas dan kuantitas minyak atsiri yang dihasilkan karena metode konvensional memiliki banyak kelemahan. Penelitian ini bertujuan untuk membandingkan hasil minyak atsiri dari proses ekstraksi konvensional menggunakan soxhlet dan ekstraksi microwave hydrodistilation . Penelitian dilakukan dengan menggunakan serbuk biji kapulaga seberat 40 gram yang telah dipisahkan dari bahan impuritiesnya . Pada metode ekstraksi Soxhlet , n-heksan digunakan sebagai pelarut, sementara itu pada metode ekstraksi Microwave Hydrodistilation menggunakan aquadest sebagai pelarutnya.  Hasil penelitian menunjukkan bahwa persen yield tertinggi diperoleh saat menggunakan metode ekstraksi soxhlet yaitu sebesar 3,608% dengan volume pelarut 250 ml , waktu ekstraksi 6 jam. Penggunaan aquades dalam metode microwave hydro-distilation tidak memberikan hasil yang maksimal jika dibandingkan metode konventional ekstraksi soxhlet dengan pelarut n-heksan.Essential oils from cardamom have many benefits in the field of industry and health. Alternative methods are needed to optimize the quality and quantity of essential oils produced because conventional methods have many disadvantages. This study aims to compare the results of essential oils from conventional extraction processes using Soxhlet and Microwave Hydrodistilation extraction. The study was conducted using cardamom seed powder weighing 40 grams which had been separated from the impurities. In the Soxhlet extraction method, n-hexane is used as a solvent, while in the Microwave Hydrodistilation extraction method uses aquadest as the solvent. The results showed that the highest percent yield was obtained when using the Soxhlet extraction method which was 3.608% with a volume of solvent of 250 ml, extraction time of 6 hours. The use of distilled water in the microwave hydro-distillation method does not give maximum results when compared to the conventional method of extracting Soxhlet with n-hexane solvent.

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