Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
In addition, the role of the microbial community in the bio-oxidation of refractory ores for removal of base metal impurities and in the recovery of Au based on biocyanidation is reviewed. They also address the future research directions in the bioleaching of Au in order to make further advances toward practical industrial applications.
Details
The mineral composition analysis of the pyrite concentrate (Fig. 1 (a)) shows that it has the lowest content of gangue minerals and only the pyrite was (FeS 2) measured. ... Enhanced oxidation capacity of refractory sulfide gold ore3.2.1. Thermal activation pretreatment.
Details
For arsenic-containing refractory gold concentrate, gold recovery by leaching is extremely difficult due to the encapsulation of gold in arsenopyrite and pyrite. In this work, the pre-oxidation of a high-arsenic and high-sulfur refractory gold concentrate in the acidic potassium permanganate or hydrogen peroxide solutions has been investigated. The …
Details
Bacterial oxidation is now considered to be a proven commercial technique for the treatment of refractory sulfide gold concentrates. Since 1986 the technique has been applied successfully on a commercial scale for the removal of arsenopyrite and pyrite to give high gold extractions on cyanidation (Van Aswegen et al., 1989).A chronology of …
Details
1. Introduction. The irregular discharge of wastewater has caused serious hazards to human production and life, such as the deterioration of water quality and the shortage of drinking water [1].Refractory organic contaminants in wastewater have the characteristics of strong obstinacy and high toxicity, which has become one of the most …
Details
Acid pressure oxidation is currently strongly advocated as the most effective pretreatment method for refractory gold ores and concentrates. Arsenopyrite and pyrite …
Details
sure oxidation has been used to treat refractory gold or es or concentrates as pretreatment and subsequent cyanidation. Alkaline pressure oxidation is an effective pretreatment for
Details
refractory gold ores. e advantages of pressure oxidation are that the reaction rate is fast, environmental pollution is low, decomposition of sul de minerals is perfect, mass re-
Details
The most effective method to solve the problem of insufficient contact between gold particles and leaching reagent is oxidation pretreatment before leaching.
Details
The maturation of biotechnology applied to the minerals industry has required some key breakthroughs. Commercial success started with the mesophilic oxidation of refractory gold ores via the now-well-established BIOX® process. This was followed by the development of the BioCOP™ process for extracting copper from concentrates.
Details
Pressure oxidation is a hydrometallurgical oxidative pretreatment for refractory ores, such as sulfide ores. Here, simultaneous alkaline pressure oxidation and sodium cyanide leaching treatments were carried out on a pyritic ore from the Mulatos Mine located in Sahuaripa, Sonora, Mexico. Mineral characterization, agitation leaching, hot …
Details
Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel. Moreover these oxidation reactions are highly exothermic. Since the nature and composition of the reaction products can have a considerable impact on …
DetailsColumn bio-oxidation of mineral with a particle size less than 10 mm at 60°C resulted in higher mineral decomposition, finer fractions and eventually higher sulfide oxidation than that at 30°C ...
Details
Bioleaching has emerged as a green technology with promising applications in mining industries in the context of recovery of precious metals from mineral ores. The authors synthesize the current knowledge available in the bioleaching of gold (Au) from ores by bringing together historical developments and recent endeavors. In addition, the role …
Details
SEM analysis was carried out to complete the study of the phase change of compounds in the oxidation of mineral sulfides. Roasting of refractory gold ore with a composition of 180 kg NaClO 3 and 180 kg water/ton ore reached a temperature of 470 °C at a microwave power of 400 watts for 30 minutes. Total oxidized sulfur reached 90.6%, …
Details
Abstract Biomining through bioleaching and bio-oxidation aims at recovering desired metals at the required specifications with lower environmental impact and costs from ores and waste streams. Research and developments related to the process technology and efficient implementation of this approach are advanced worldwide. Small …
Details
Mineral dissolution kinetics and microbial community in bio-oxidation was lucubrated in this work and suggestions were provided for pre-treatment of refractory gold ore. This paper describes the oxidative dissolution kinetics of sulfides with gold occlusion within pyrite and arsenopyrite.
Details
The bulk of the proven ore reserves are sulphidic and refractory. The main minerals are pyrite and arsenopyrite with trace amounts of chalcopyrite, sphalerite, stibnite, galena, pyrrhotite and pentlandite. Temperature has been one of the most important control variables and as can be observed has been held at 40 °C by cooling.
Details
Pyrite and arsenopyrite are known to be the most common gold-bearing sulfide minerals in refractory gold ores. Traditionally, these minerals have been first oxidized by roasting, acidic pressure ...
Details
of sulfide minerals was provided via bio-oxidation using a microbial culture. The pH value was measured daily, maintained in a range of 1.0–1.2 by adding either concentrated
Details
Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources …
Details
In addition, SiO 2 and FeAsS are also the major minerals for the sulfide refractory gold ore. Table 2. Chemical composition of the sulfide refractory gold ore and pyrite (mass percent, %). Empty Cell ... Redox potential measurement during pressure oxidation (POX) of a refractory gold ore. Canadian Metallurgical Quarterly, 57 (4) …
Details
The ozonation of refractory minerals can improve gold extraction through direct treatment or indirect oxidation. It minimizes gold entrapping with refractory minerals by creating desired oxidizing ...
Details
In unoxidized (refractory) ores, the micron-sized gold is associated with sulfide minerals and organic carbon such as kerogen and asphaltine. Oxidation of the Mercur deposit developed upwards progressively from the bottom of the deposit such that the upper portion of the deposit contains refractory ore.
Details
Pre-oxidation of sulfide minerals using ammonium solutions containing cupric ions can be considered as a pretreatment process for refractory gold ores at …
Details
Other researchers reported that 97 % oxidation of sulfide minerals achieved 99 % gold extraction (Ahtiainen et al., 2021). The results of the leaching test on roasted gold ore showed that pretreatment is an essential stage in the processing of refractory gold ore. Gold extraction can be increased significantly from 47.5 % without pretreatment ...
Details
In the air oxidation roasting process, the major components (FeAsS, FeS 2) of the sulfide refractory gold ore would convert into iron oxides, arsenic oxides, sulfur …
Details
The low amount of gold extracted by conventional cyanidation (46%) occurs when the mineral has refractoriness properties due to occlusion by the pyrite matrix. When the pressure leaching and …
Details
This paper presents a research overview, reconciling key and useful case study findings, towards uncovering major causes of gold refractoriness and maximising extraction performance of specific gold flotation and bio-oxidation products. Through systematic investigation of the ore mineralogical and gold deportment properties, …
Details
Refractory gold mining often involves complex extraction processes, such as pressure oxidation or bioleaching, which can release harmful chemicals and pollutants into the environment. This can lead to water and soil contamination, impacting local ecosystems and communities (Bouffard and Dixon 2004 ; Asamoah 2021 ).
Details
Characterization indicated that pyrite was the main mineral. Simultaneous pressure oxidation and leaching experiments were conducted at a temperature range of 40–80 °C, oxygen pressure of 87.5 ...
Details
continuously decreasing, while refractory gold minerals are becoming the most important resources in the eld of gold extraction. In these original ores, most of the gold is encapsulated in the lattice of pyrite and arsenopyrite, resulting in dif- ... at pH 10.5–11.5 after acid pressure oxidation pretreatment of refractory gold ores. However ...
Details
This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment. process prior to cyanidation of refractory gold/silver ores. The nitric acid pre -treatment ...
Details
The ozonation of refractory minerals can improve gold extraction through direct treatment or indirect oxidation. It minimizes gold entrapping with refractory minerals by creating desired oxidizing …
Details
With the rising focus on the development of complex refractory ores, one of the major environmental challenges has been in the treatment and processing of arsenic-bearing minerals. An increasingly common approach is to immobilize arsenic as stable ferric arsenate phases during pressure oxidation, utilizing an existing process in the …
Details
The most used process today to solve this problem presented by refractory minerals are oxidative pretreatments (alkaline and acidic oxidation), which can be used …
Details
Refractory gold mining often involves complex extraction processes, such as pressure oxidation or bioleaching, which can release harmful chemicals and pollutants …
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE