New gold extraction process is faster, safer

1984 ◽  
Vol 62 (6) ◽  
pp. 5
Keyword(s):  
Extraction Process ◽  
Gold Extraction

Cyanide Recovery from Gold Extraction Process Waste Effluents by Ion Exchange I. Equilibrium and Kinetics

2006 ◽  
Vol 24 (1) ◽  
pp. 99-117 ◽  
Author(s):  
M. Torre ◽  
D. Bachiller ◽  
M. Rendueles ◽  
C. O. Menéndez ◽  
M. Díaz
Keyword(s):  
Ion Exchange ◽  
Extraction Process ◽  
Gold Extraction ◽  
Process Waste ◽  
Equilibrium And Kinetics ◽  
Waste Effluents

scholarly journals Peningkatan pengetahuan pada masyarakat tentang konstruksi sumur gali dan bak penampungan limbah serta jarak yang aman terhadap sumber pencemar

2020 ◽  
Vol 1 (2) ◽  
pp. 122
Author(s):  
Darmiati Darmiati ◽  
Nilawati Nilawati
Keyword(s):  
Cognitive Abilities ◽  
Extraction Process ◽  
Fine Motor ◽  
Waste Collection ◽  
Gold Extraction ◽  
Cross Sectional ◽  
Question Item ◽  
Dug Wells ◽  
Cross Sectional Design ◽  
Dug Well

Background: The use of mercury material has developed very broadly, and one of them is in the gold mining process which is carried out in the gold extraction process. The activity is carried out in the yard of the house and adjacent to the dug well, this can cause pollution in the soil and dug well water. Problems that arise due to exposure to Mercury are gastrointestinal disorders, kidney damage, nerve damage, disability in the fetus, while in children will reduce cognitive abilities and thinking, memory, attention, language mastery, fine motor skills and visual.Objectives: The purpose of this community service is to increase community knowledge about the construction of dug wells and waste collection tanks as well as a safe distance to pollutants in the traditional gold mining.Method:  The study used a cross-sectional design, involving subjects in 30 community groups. Data collection using a questionnaire and conducted interviews. Analysis of research data is only done univariately.Results: The results of the evaluation of the activity revealed that there was an increase in public knowledge of the conditions for the construction of dug wells, waste collection basins and diseases caused by mercury exposure directly or indirectly on the human body (able to answer questions correctly more than 20% on each question item).Conclusion: Most people begin to understand that the danger of mercury does not only occur in the skin, but can affect the entire organ system and permanent nervous system damage.

scholarly journals Penurunan Logam Hg dalam Air Menggunakan Sistem Sub-Surface Flow Constructed Wetland: Studi Efektivitas

2019 ◽  
Vol 13 (1) ◽  
pp. 41
Author(s):  
Rikhanatul Firdausy Puspitasari ◽  
Agus Prasetya ◽  
Edia Rahayuningsih
Keyword(s):  
Constructed Wetland ◽  
Room Temperature ◽  
Gold Mining ◽  
Extraction Process ◽  
Surface Flow ◽  
Mercury Contamination ◽  
Gold Extraction ◽  
Mining Areas ◽  
The Media ◽  
Gold Bearing

A B S T R A C THigh amount of Mercury contamination is commonly found in traditional gold mining areas. This problem might occur due to the use of amalgamation process in traditional gold extraction process by dissolving the gold-bearing rocks with mercury (Hg). The utilization of mercury in gold mining activity has contaminated the water with Hg which might lead to serious health problems. This research was carried out by discharging the Hg-contaminated wastewater to enter a system called the Sub-Surface Flow Constructed Wetland (SSF-SW). The system employed a mixture of soil and the fibers of water hyacinth as the media on which Echinodorus palaefolius L. was planted. The wastewater containing HgCl2 at 8.59 mg/L was flown. The flow rate and pH were set to 6.3 L/hour and 6-7 pH at room temperature. Samples were collected at 0; 3.5; 7; 10.5 hours every day. The SSF-CW system was continually run for 10.5 hours and 13.5hour batch. The result of this research showed that the efficiency of Hg removal reached 92.79%. The results showed that the SSF-CW offers a stable system to reduce the mercury levels as shown in the growth of the plant and the total Hg removal efficiency. Plants with Hg exposure have distinct patterns of chlorosis. Some leaves turning yellow and die, others start with new growth. In addition, the growth of Echinodorus palaefolius L. was also influenced by the amount of nutrients in the soil.Keywords: Echinodorus palaefolius L., mercury, sub-surface flow constructed wetland A B S T R A KPencemaran merkuri banyak ditemukan pada penambangan emas tradisional. Pada umumnya proses yang diterapkan dalam penambangan emas tradisional dalam ekstraksi emas adalah proses amalgamasi, yaitu dengan cara mencampur bijih emas dengan merkuri (Hg). Aktivitas penambangan dengan memanfaatkan Hg menyebabkan tercemarnya air dengan Hg yang dapat membahayakan kesehatan. Penelitian ini dilakukan dengan cara mengalirkan air limbah Hg ke dalam sistem Sub-Surface Flow Constructed Wetland (SSF-CW). Media yang digunakan berupa campuran tanah dan serat eceng gondok serta ditanami dengan Echinodorus palaefolius L. Penelitian dilakukan dengan mengalirkan air limbah HgCl2 berkonsentrasi 8,59 mg/L. Percobaan menggunakan laju alir 6,3 L/jam dengan pH sekitar 6-7 pada suhu ruangan. Pengambilan sampel dilakukan pada jam ke 0; 3,5; 7 dan 10,5 pada setiap harinya. Operasi sistem SSF-CW dijalankan 10,5 jam kontinu dan 13,5 jam batch. Hasil penelitian menunjukkan efisiensi penurunan Hg sebesar 92,79%. Penelitian menunjukkan bahwa sistem SSF-CW cukup stabil. Kestabilan sistem SSF-CW dalam menurunkan kadar Hg dapat dilihat dari pertumbuhan tanaman dan total penurunan yang diperoleh. Tanaman yang terpapar Hg terlihat bercak klorosis. Beberapa daun menguning dan mati, sebagian lain tumbuh tunas baru. Pertumbuhaan Echinodorus palaefolius L. tidak lepas dari pengaruh unsur hara yang terdapat di dalam tanah.Kata kunci: Echinodorus palaefolius L., merkuri, sub-surface flow constructed wetland

scholarly journals Recovery of Gold from Ore with Potassium Ferrocyanide Solution under UV Light

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 387
Author(s):  
Ziyuan Liu ◽  
Jue Kou ◽  
Yi Xing ◽  
Chunbao Sun
Keyword(s):  
Photoelectron Spectroscopy ◽  
Uv Light ◽  
Light Response ◽  
Extraction Process ◽  
Potassium Ferrocyanide ◽  
Sensor Surface ◽  
Gold Extraction ◽  
Solution Ph ◽  
Gold Leaching ◽  
Two Stages

In this study, potassium ferrocyanide, a nontoxic cyanide precursor in dark and diffuse reflection environment, was applied as reagent for the leaching of gold. The free cyanide ions could gradually release from potassium ferrocyanide solution under the ultraviolet light. Orthogonal leaching experiments were performed in gold ore to analyze the effect of solution pH, potassium ferrocyanide dosage, and temperature in a potassium ferrocyanide solution system under UV light. Response surface methodology (RSM) was applied to explore the role of potassium ferrocyanide in gold leaching; optimized results showed that the gold recovery reached 67.74% in a high-alkaline environment at a 12.6 pH, 3.8 kg/t potassium ferrocyanide dosage, 62 °C, and irradiance of 10 mW·cm−2. The gold leaching kinetics were monitored by quartz crystal microbalance with dissipation (QCM-D) of potassium ferrocyanide solution. The results indicate that the gold extraction process could be divided into two stages: adsorption and leaching, and a rigid adsorption layer formed on the reaction surface. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis of the gold sensor surface after leaching reaction showed that –C≡N appears on the gold sensor surface, and the gold is oxidized to form AuCN complexes.

Identification of elements hindering gold leaching from gold-bearing dust and selection of gold extraction process

2021 ◽  
pp. 105612
Author(s):  
Pan Cao ◽  
Shuanghua Zhang ◽  
Yajie Zheng ◽  
Shenzhi Lai ◽  
Geyi Liang ◽  
...  
Keyword(s):  
Extraction Process ◽  
Gold Extraction ◽  
Gold Leaching ◽  
Selection Of ◽  
Gold Bearing

scholarly journals Sº and jarosite behavior during recovery of values from the direct leaching residue of sphalerite using cyanide and glycine

2021 ◽  
pp. 31-31
Author(s):  
N.G. Picazo-Rodríguez ◽  
F.R. Carrillo-Pedroza ◽  
Martínez Luévanos ◽  
M.J. Soria-Aguilar ◽  
I. Almaguer-Guzmán
Keyword(s):  
Hydrothermal Treatment ◽  
Elemental Sulfur ◽  
Extraction Process ◽  
Gold Extraction ◽  
Valuable Metals ◽  
Negative Effect ◽  
Leaching Residue ◽  
Direct Leaching ◽  
Cyanide Consumption ◽  
Silver Extraction

This paper reports the effect of the components of a direct leaching residue (jarosite and elemental sulfur), on the recovery of valuable metals such as gold and silver. Leaching media such as cyanide and mixtures of cyanide with glycine were used to recover the gold and silver from the residue; however, a low recovery of these metals was obtained. The above due to the negative effect of its components which cause problems in the extraction process such as encapsulation of silver (due to jarosite) and the formation of thiocyanate and re-precipitation of silver (due to sulfur). Various treatments prior to leaching were tested, finding that when the residue is desulfurized with perchlorethylene and subjected to an oxidizing alkaline hydrothermal treatment, the gold extraction increased from 39.73 to 88% and the silver extraction of 64.76 to 94.29%. Additionally, it was determined that when cyanide is assisted by glycine, the latter decreases the cyanide consumption by inhibition of the dissolution of iron and sulfur in cyanide.

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