A study of gold ore for processability by gravity separation techniques

2021 ◽  
pp. 8-16
Author(s):  
P. K. Fedotov ◽  
K. V. Fedotov ◽  
A. E. Burdonov ◽  
A. E. Senchenko
Keyword(s):  
Gold Deposits ◽  
Gravity Separation ◽  
Separation Processes ◽  
Separation Techniques ◽  
Total Percentage ◽  
Ore Bodies ◽  
Low Concentrations ◽  
Resultant Data ◽  
Stage 1 ◽  
The Cost

Today’s concentrators deal with a lot of gold deposits comprising smaller ore bodies, having low concentrations of the metal and situated in remote areas. The cost of detailed exploration and a full-fledged processability study considering the time and labour required may appear to exceed the cost of metal recovered from a deposit or a particular ore body. This paper describes some approaches to examining the gold ores mined at such deposits for processability and to developing gravity separation processes, which help save the time and cost of research without affecting the quality of resultant data. This research relied on the GRG test developed by Knelson in Canada, as well as a stage test developed by Institute TOMS in Russia (designed to determine optimum grinding size and number of processing stages). A simulation study was conducted to understand the recovery of gold during the grinding cycle (Stage 1) and to examine the Stage 2 process in a KC-CVD concentrator including concentrate refinement. The authors determined the distribution size of the feed material for each GRG test stage, documented the total percentage of gold recoverable by gravity separation as a function of the ore size, and established how the ore size and the KC-CVD concentrate output influence the gold recovery. This research study resulted in a process flow chart indicating the concentration performance based on gravity separation techniques.

Sorption and desorption of phosphorus by shale: batch and column studies

2010 ◽  
Vol 61 (3) ◽  
pp. 599-606 ◽  
Author(s):  
Johnsely S. Cyrus ◽  
G. B. Reddy
Keyword(s):  
Residence Time ◽  
Flow Rate ◽  
Nutrient Release ◽  
Phosphorus Sorption ◽  
Column Studies ◽  
Desorption Process ◽  
Low Concentrations ◽  
Sorbent Materials ◽  
High Concentrations ◽  
The Cost

Constructed wetland systems have gained attention as attractive solutions for wastewater treatment. Wetlands are not efficient to treat wastewater with high concentrations of phosphorus (P). In order to remove high soluble P loads by wetland, sorbent beds can be added prior to the discharge of wastewater into wetlands. Sorption by sorbent materials is identified as a method for trapping excess P in wastewaters. In the present investigation, shale has been identified as a sorbent material for removal of phosphate (PO4-P) due to the cost effectiveness, stability and possibility of regeneration. The study focuses on the removal of PO4-P from wastewater using shale and the feasibility of using the P-sorbed material as slow-release fertilizer. Phosphorus sorption experiments were conducted by using shale (2 mm and 2–4.7 mm). Results indicate that Shale I (particle size = 2 mm) showed the highest sorption of PO4-P (500 ± 44 mg kg−1). Breakthrough point was reached within 10 h in columns with flow rates of 2 and 3 ml min−1. Lower flow rate of 1 ml min−1 showed an average residence time of about 2 h while columns with a higher flow rate of 3 ml min−1 showed a residence time of about 40 minutes. Variation in flow rate did not influence the desorption process. Since very low concentrations of PO4-P are released, Shale saturated with PO4-P may be used as a slow nutrient release source of P or as a soil amendment. The sorbent can also be regenerated by removing the sorbed PO4-P by using 0.1 N HCl.

Modul Persamaan Lingkaran Berbasis Search, Solve, Create and Share (SSCS)

2020 ◽  
Vol 8 (4) ◽  
pp. 261-272
Author(s):  
Evi Candra Monica ◽  
Nurain Suryadinata ◽  
Nurul Farida
Keyword(s):  
Development Research ◽  
Questionnaire Response ◽  
Design Expert ◽  
Is Research ◽  
Total Percentage ◽  
Learning Mathematics ◽  
Stage 1 ◽  
D Model ◽  
Group Trial ◽  
Expert Validation

The purpose of the development of this mathematics module is to produce products in the form of mathematical modules based on Search, Solve, Create, and Share (SSCS) material that is valid and practical. The type of research that is used is research and development (R&D). The model that is used is the R&D model developed by Sugiyono who has been modified. The stages which are used in this development research only stage 1 through 7. The instruments which are used were expert validation questionnaire and questionnaire response of students. Based on the results of expert validation obtained the results of the validation of material expert 78,84% (decent categories), linguists expert 85% (category of very feasible) and design expert 83,6% (a very feasible category), so that the overall percentage of the validator obtained a total percentage of 82,48% (very feasible category). The results of the small group trial were obtained from the response of students of the mathematics module was 84% (a very practical category). Based on the results, it can be concluded that the SSCS-based mathematics module material for students’ questions in SMA Negeri 1 Metro is very feasible and very practical to be used as a source of learning mathematics, especially circle material.

Impact of Government Bailout on Banks’ Cost of Equity: Additional Evidence from the Financial Bailout of 2008–2009

2021 ◽  
Vol 24 (01) ◽  
pp. 2150003
Author(s):  
Daphne Wang ◽  
Robert Houmes ◽  
Thanh Ngo ◽  
Omar Esqueda
Keyword(s):  
Institutional Ownership ◽  
The United States ◽  
Matched Sample ◽  
Cost Of Equity ◽  
Troubled Asset Relief Program ◽  
Low Concentrations ◽  
The Government ◽  
The Cost ◽  
Relief Program ◽  
Robust Evidence

The Capital Purchase Program (CPP) was the first and most significant program under the Troubled Asset Relief Program (TARP) during 2008–2009 financial crisis. This study evaluates the effect of the CPP during this period on the cost of equity of 170 publicly listed banks in the United States that received funding. To control for the potential effects of endogeneity on our results, we use a propensity score matched sample of non-CPP banks. Using this approach, we document robust evidence that the liquidity provided by the government bailout reduced the cost of equity for recipient banks, especially for those banks that repaid their bailout funds in full. This decrease in the cost of equity is particularly significant for banks with high market-to-book ratios, low concentrations of institutional ownership, and those banks with at least one large blockholder. Our findings have important implications for the assessment of government bailout programs and the future regulation of financial institutions.

Oxidized and reduced mineral assemblages in greenstone belt rocks of the St. Ives gold camp, Western Australia: vectors to high-grade ore bodies in Archaean gold deposits?

2007 ◽  
Vol 43 (3) ◽  
pp. 363-371 ◽  
Author(s):  
Peter Neumayr ◽  
John Walshe ◽  
Steffen Hagemann ◽  
Klaus Petersen ◽  
Anthony Roache ◽  
...  
Keyword(s):  
Western Australia ◽  
Greenstone Belt ◽  
Gold Deposits ◽  
High Grade ◽  
Ore Bodies ◽  
Mineral Assemblages

scholarly journals Film Dokumenter Permainan Tradisional “Adu Gangsing” di Buleleng “Sebagai Warisan Budaya”

2019 ◽  
Vol 8 (1) ◽  
pp. 66
Author(s):  
Kadek Adi Sidiantara . ◽  
I Gede Mahendra Darmawiguna, S.Kom., M.S . ◽  
Gede Aditra Pradnyana, S.Kom., M.Kom. .
Keyword(s):  
Cultural Heritage ◽  
Documentary Film ◽  
Audience Response ◽  
Public Response ◽  
Total Percentage ◽  
Content Expert ◽  
Strategy Model ◽  
Long Time ◽  
Evaluation Stage ◽  
Stage 1

Permainan Tradisional “Adu Gangsing” adalah salah satu jenis permainan tradisional yang diwariskan sejak lama oleh nenek moyang kita. Penelitian ini bertujuan untuk (1) menghasilkan rancangan dan mengimplementasikan hasil rancangan film dokumenter Permainan Tradisonal “Adu Gangsing” di Buleleng (sebagai warisan budaya leluhur yang tidak lekang oleh waktu), (2) Untuk mengetahui respon masyarakat terhadap hasil akhir film dokumenter “Adu Gangsing” di Buleleng (sebagai warisan budaya leluhur yang tidak lekang oleh waktu) Jenis penelitian yang digunakan dalam penelitian ini adalah penelitian dengan model cyclyc strategy. Model ciclyc strategy terdiri dari tahap brief (riset awal dan penawaran ide), tahap 1 (pengumpulan data dan analisis kebutuhan film), tahap 2 (pra-produksi), evaluasi peneliti, tahap 3 (produksi dan pasca produksi), evaluasi uji ahli (ahli media dan ahli isi), tahap 4 (burning, desain poster, dan desain DVD), outcome (publikasi film) dan uji respon penonton. Hasil penelitian menunjukan bahwa film dokumenter Permainan Tradisonal “Adu Gangsing” di Buleleng (sebagai warisan budaya leluhur yang tidak lekang oleh waktu) dalam kriteria sangat baik. Simpulan yang didapatkan yaitu perancangan film dokumenter Permainan Tradisonal “Adu Gangsing” di Buleleng (sebagai warisan budaya leluhur yang tidak lekang oleh waktu) telah berhasil dilaksanakan dengan model cyclic strategy dengan menggunakan tahapan produksi film. Film dokumenter Permainan Tradisonal “Adu Gangsing” sudah berhasil masuk dalam kategori sangat baik sesuai dengan hasil uji ahli isi dan media. Serta berdasarkan analisis terhadap 30 orang responden yang berasal dari kalangan masyarakat khususnya generasi muda dinyatakan bahwa film dokumenter ini mendapatkan total presentase sebesar 90,59% yang masuk kategori sangat baik.Kata Kunci : Kata kunci: Permainan Tradisional, Adu Gangsing, Film Dokumenter, Cyclic Strategy. Traditional games "Adu Gangsing" is one type of traditional game that has been inherited for a long time by our ancestors. This study aims to (1) produce designs and implement the results of the documentary documentary "Adu Gangsing" Traditional Games in Buleleng (as a timeless heritage), (2) To find out the public response to the final results of the documentary "Adu Gangsing" "In Buleleng (as a timeless cultural heritage) The type of research used in this study is research with a cyclyc strategy model. The Ciclyc strategy model consists of a brief stage (initial research and idea offering), stage 1 (data collection and film needs analysis), stage 2 (pre-production), researcher evaluation, stage 3 (production and post-production), expert test evaluation ( media expert and content expert), stage 4 (burning, poster design, and DVD design), outcome (film publication) and audience response test. The results of the study show that the documentary film "Adu Gangsing" Traditional Games in Buleleng (as a timeless cultural heritage) is in very good criteria. The conclusions obtained were the design of the documentary film "Adu Gangsing" Traditional Games in Buleleng (as a timeless cultural heritage) that has been successfully implemented with a cyclic strategy model using the stages of film production. The documentary film "Adu Gangsing" Traditional Games has successfully entered the excellent category according to the results of the content and media expert test. And based on the analysis of 30 respondents from the community, especially the younger generation, it was stated that the documentary film received a total percentage of 90.59% which was in the excellent categorykeyword : Keywords: Traditional Games, “Adu Gangsing”, Documentary Film, Cyclic Strategy

Distillation-based Separation Systems Synthesis

1995 ◽  
Author(s):  
Christodoulos A. Floudas
Keyword(s):  
Capital Investment ◽  
Optimal Configuration ◽  
Synthesis Problem ◽  
Total Annual Cost ◽  
Separation Processes ◽  
Distillation Columns ◽  
Separation Systems ◽  
Total Capital ◽  
Separation Sequence ◽  
The Cost

This chapter presents two applications of MINLP methods in the area of separations. Section 9.1 provides an overall introduction to the synthesis of separation systems. Section 9.2 focuses on sharp heat-integrated distillation sequencing. Section 9.3 presents an application of nonsharp separation synthesis. The synthesis of distillation-based separation sequences has been one of the most important subjects of investigation in the area of process synthesis. This is attributed to the significant contribution of separation processes to the total capital investment and operating expenses of a chemical plant. As a result, a lot of interest has been generated in the development of systematic approaches that select optimal sequences of distillation columns. Westerberg (1985) provided a comprehensive review of the distillation-based separation synthesis approaches, as well as presented a classification of different types of separation problems along with their associated challenges. Nishida et al. (1981) and Smith and Linnhoff (1988) reviewed the general separation synthesis problem (i.e., not only distillation-based) and presented the progress made. To illustrate the nature of the distillation-based separation system synthesis problem, let us consider its generic definition shown in Figure 9.1, which is as follows: . . . Given a number of input multicomponent streams which have specified amounts for each component, create a cost-optimal configuration of distillation columns, mixers, and splitters that produces a number of multicomponent products with specified composition of their components. . . The products feature components that exist in the input streams and can be obtained by redistributing the components existing in the input streams, while the cost-optimal configuration corresponds to the least total annual cost one. Most of distillation columns or sequences can be classified as (i) Sharp, (ii) Nonsharp, (iii) Simple, (iv) Complex, (v) Heat-integrated, and (vi) Thermally coupled. In (i), a column separates its feed into products without overlap in the components. An example is the separation of a stream consisting of four components A, B, (C, and D via a distillation column, into one product consisting of only A and another product featuring B, C, and D. If all columns are sharp, then the separation sequence is termed as sharp sequence.

scholarly journals African Special Project: Stage Two—The Arusha Conference

Oryx ◽  
1962 ◽  
Vol 6 (4) ◽  
pp. 211-214
Author(s):  
John Hillaby
Keyword(s):  
Wild Animals ◽  
Special Project ◽  
The Common ◽  
Common Effort ◽  
Stage 1 ◽  
The Cost

The International Wildlife Conference, held at Arusha in Tanganyika from 5th to 12th September, 1961, has been justly described as the most important gathering of conservationists and ecologists ever held in Africa. Members of the Fauna Preservation Society can take satisfaction from the fact that their Society contributed a very great deal to its success. The Society made a very substantial grant towards the cost of African Special Project, Stage 1, the survey which preceded the conference, and also provided funds to enable twelve Africans to attend the conference and one of the post-conference tours. Furthermore, the Society was well represented at all the sessions of the conference by members of a delegation led by its President, the Marquess of Willingdon. What characterized the Arusha discussions as a whole was a sense of unity of purpose in the common effort to conserve the wildlife of Africa. On some points of detail there was conflict of opinion vigorously expressed. The merits and dangers of the regular cropping or harvesting of wild animals was a notable example. Conference was divided between the advantages in theory and the snags in practice, especially the snag of setting up adequate marketing facilities, but on this debatable point, as in others, it was significant that everyone was united in the importance of game management, an expression in common use throughout the week.

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