قائمة الطعام
The most of refractory ore is gold bearing sulfide. Sulfide iron ore includes many kinds of pyrite and arsenopyrite. Ore and sulfide ore are symbiotic closely …
A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.
Hydrometallurgical process for recovery of precious metals from refractory sulfide ore. Use: for hydrometallurgy of precious metals, in particular the extraction of metals from ores resistant for processing leaching reagents. The inventive method comprises grinding the ore to a nominal size of at least 0,64 cm, acidification with mineral acid ...
For refractory ores, oxygen enrichment is an effective way to reduce process gas volume, which has a significant effect on plant size and consequentially CAPEX. The major objectives of the roasting process are to eliminate the sulfur and carbon contained in the concentrate, remove impurities such as arsenic, and to provide a calcine product and ...
A method for recovering metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulfide minerals from the separated fines and adding the concentrate to the heap, bioleaching the heap to thereby oxidize iron ...
CN110819818A CN201911097444.0A CN201911097444A CN110819818A CN 110819818 A CN110819818 A CN 110819818A CN 201911097444 A CN201911097444 A CN 201911097444A CN 110819818 A CN110819818 A CN 110819818A Authority CN China Prior art keywords gold leaching ore pretreatment refractory Prior art date Legal status (The legal status is an assumption and …
Sulfide-associated gold is often very fine in nature and difficult to separate from the sulfides. Refractory Gold. A refractory gold ore can be defined as any ore that responds poorly to a conventional gravitycyanidation process with examples often including copper porphyry, complex sulfides, arsenopyrite and lead-zinc associations. There are ...
sulfide ores host different proportions of non-refractory and refractory gold. Gold in non-refractory sulfide ores can be recovered by whole-ore cyanidation, or some combination of flotation and cyanidation. Acceptable extraction of refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony ...
A refractory ore generally contains sulfide minerals, organic carbon, or both. Sulfide minerals are impermeable minerals that occlude gold particles, making it difficult for the leach solution to form a complex with the gold. Organic carbon present in gold ore may adsorb dissolved gold-cyanide complexes in much the same way as activated carbon.
Changes in sulfide sulfur concentration and the formation of oxide phases during fungal treatment were confirmed using Raman spectroscopy and X-ray diffraction analysis. These results suggest that P. chrysosporium is a potential microorganism for oxidative decomposition of metal sulfides associated with refractory gold ores.
The initial plant had a capacity of 28 t/h of sulfide concentrates and has reportedly been expanded. The leachox Process is another recently developed hydrometallurgical approach to the treatment of refractory gold ores. The technology is owned and marketed by Maclgwyn Mineral Services (MMS) based in the United Kingdom.
Preferential Flotation of a Refractory Cu-Pb-Zn Polymetallic Ore Shun-Ming Deng1, *, Jian-Tao Lang2 1 Chongqing Vocational Institute of Engineering,School of Mechanical Engineering,Chongqing,China,402260 2 Kunming University of Science and Technology, Kunming City, China *@189 Keywords: Copper-lead-zinc sulfide ore, Preferential flotation, …
Processing Sulfide Ores. Historically, miners have shipped their sulfide concentrates to overseas smelters that have little to no regulations or emissions controls. However, with the implementation of the Mercury Export Ban of 2008 and the high costs of installing equipment to prepare sulfide ores for cyanide leaching, many companies are ...
'locked' in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides. This type of gold is typically very fine gold or locked in solid solution within sulphide minerals pyrite and arsenopyrite (FeAsS). The arsenic bearing pyrite is
Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade. In sulfide ores, pyrite is the most common host mineral for gold. Studies by Gasparrini (1983) showed that gold occurs in pyrite as …
Ores high in sulfide or carbonaceous materials are classified as refractory due to the requirement for pre-treatment before cyanidation [2, 3]. Sulfidic refractory ores have sulfide from minerals such as pyrite . These ores have negative interactions with cyanide, Eq. 2 [5, 6].
During roasting, refractory gold ore is treated with extremely hot air. This causes the sulfites to oxidize, separate from the ore, and become sulfur dioxide. Once all of the sulfides are oxidized, the remaining gold ore can be processed normally. The roasting method has been around for hundreds of years. Prior to the 20th century, the process ...
refractory sulfide ores which have studied so far are only through pretreatment the ores. On the other hand, no information exists about direct cyanidation of refractory gold ore using sodium nitrite as an oxidant. It is known that sodium nitrite is more oxidative than …
Gold ore refers to refractory carbonaceous arsenic-containing sulfide ores. The gravity concentration of ore was assessed using a laboratory 3-inch Knelson KC-MD3 centrifugal concentrator ...
Two examples are the large low-grade ore bodies which require very fine grinding and refractory sulphides which have to be concentrated and roasted to expose gold to cyanide action. A Flowsheet to recovery gold from sulfide ores. There are many arrangements and combinations using flotation in conjunction with treatment of gold ores.
The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore.
A refractory ore contains gold (III) sulfide, silver sulfide, and lead sulfide. The exact composition of these precious metals in the ore can be analyzed with EDS and used to determine whether the site is worth mining. The characteristic X-ray lines and market price are presented below: Element Lead (Pb) Gold (Au) Silver (Ag) Sulfur (S) Kα ...
More commonly in a sulphide ore you would need to float the sulphide minerals, assuming the gold is associated with them, which it often is, and then oxidise it to free the gold for cyanidation. In your case and with the mix of sulphides you are mentioning you are possibly looking at a refractory ore, and you are going to have issues with ...
It is also called refractory gold ore or refractory gold ore. According to the different reasons for its difficulty, it can be divided into the following three categories. (1) Wrapped gold deposit. In this kind of gold ore, gold is wrapped in arsenopyrite, pyrite, arsenopyrite, chalcopyrite, pyrrhotite, galena, sphalerite and other sulfide ores ...
refractory sulphide–barite ore "Bobija" reduction by carbon to liberate lead, zinc, and copper sulphide from barite-pyrite base. In order to separate the barite, the ore was reduced with the carbon, wherein the barite is converted to the barium-sulfide [14,15]: BaSO. 4
Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the treatment of sulfide refractory gold ore, such as environmental pollution and low gold recovery.
Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns. The gold is normally present in refractory gold sulphide ores containing mainly pyrite, arsenopyrite or pyrrhotite and occurs in both the chemically bonded ...
In sulphidic refractory gold ores, gold is highly disseminated and locked up in sulphide minerals, such as pyrite and arsenopyrite, in the form of micro or sub-micro particles, and is often recovered with these sulphide minerals by flotation [8,20].
Kanowna Belle is a refractory gold operation located near Kalgoorlie in Western Australia. The primary ore to be treated is refractory in nature, exhibiting only 70–75% recovery, even after fine grinding and cyanidation. The ore has a low average sulfide content of approximately 1%, predominantly pyrite.
The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at a temperature between 300° and 600° C. while stirring. The process converts precious metals in the elemental and sulfide forms into ...
tion as refractory ores cannot be easily treated by simple cyanida-tion treatment. In refractory ores, gold is typically encapsulated inside a sulfide matrix (pyrite, arsenopyrite) that must be decom-posed to liberate the gold for leaching (Marsden and House 2005).
Current Situation on Flotation of Cu-Pb-Zn Sulfide Ore Jian-Tao Lang1, Si-Qing Liu2,*, Xu Dong3,Yi Pei4 1,2,3,4 Kunming University of Science and Technology, Kunming City, Yunnan Province, China *1326847906@qq Keywords: Copper-lead-zinc sulfide ore, Flotation process, Separation of bulk concentrate, Flotation column Abstract. In the flotation of copper - lead - zinc polymetallic sulfide ...
Direct cyanidation and roasting combination of a semi-refractory massive sulfide ore. H. Abdollahi 1,2,3, P. Karimi Ph.D. candidate in Mineral Processing 4, A. Amini Head (manager) 5 & A. Akcil 3 Mining, Metallurgy & Exploration volume 32, pages 161–169 (2015)Cite this article
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