Background

sulphide ore refractory

(PDF) Kinetics of barite reduction from refractory barite ...

Refractory sulphide–barite ore was reduced with carbon in order to release lead, zinc, and copper sulphide from barite-pyrite base. Mineralogical investigations showed that due to the complex ...

Effect of Pretreatment of Sulfide Refractory Concentrate ...

gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold

Refractory Gold Ore Treatment Methods

Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from …

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation …

Types of refractory gold deposits - Fodamon Machinery

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 ...

(PDF) Processing of refractory gold sulphide …

gold surface of doub le refractory gold ore (sulphide with carbon co atings) in a cyanide . medium [3]. For in stance, the pres ence of car bon wit h graph ite str uctur e matrix consi stin g .

Characterizing gold in refractory sulfide gold ores and ...

Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nano-size grains of metallic gold. During roasting or pressure oxidation, the sulfide matrix is destroyed and essentially all the gold is converted to the metallic form. The liberated gold is readily dissolved in conventional cyanide …

Bacterial Oxidation of a Refractory Arsenopyrite Gold ...

The ore deposit is located in the Northern Territory in Australia. The company owning the refractory gold sulphide ore also operates a processing plant approximately 110 km northwest of its refractory gold sulphide ore deposit. A strategic decision has been made to mine the ore and haul this to the current operational site for processing.

Refractory sulfide ores – case studies - ScienceDirect

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. There is a severe shortage of good quality water in the Kalgoorlie area.

Processing Gold from Sulfide Ores - Assaying, Microscopy ...

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 ...

KINETICS OF BARITE REDUCTION FROM REFRACTORY …

Refractory sulphide–barite ore was reduced with carbon in order to release lead, zinc, and copper sulphide from barite-pyrite base. Mineralogical investigations showed that due to the complex structural-textural relationships of lead, copper and zinc minerals with gangue minerals, it is not possible to enrich the ore using the conventional ...

Methods of Processing of the Gold-Containing …

polymetallic ore, thiourea Analysis of literary data shows that in gold min-ing the main method of gold extraction from ores and concentrates is cyanidation, which is not cost-effec-tive in case of the refractory sulfide ores. Neutraliza-tion of cyanide solutions is also a serious problem. On the other hand, application of nontraditional meth-

Recovery of gold from sulfide refractory gold ore ...

Abstract: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. In this study, A novel method for gold recovery from refractory gold ...

GOLD RECOVERY OF REFRACTORY SULFIDE …

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.

Treatment of refractory carbonaceous sulfide ores for gold ...

Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation; the particular steps in the treatment of the ore have been found to be necessary as the conventional pretreatment will not improve the yields on any …

(PDF) Refractory gold-bearing ores: a review of treatment ...

The problem of the refractory nature of gold-bearing sulphide ores is described and possible pretreatments are reviewed. Among them, bioleaching is an interesting one from an environmental point ...

The Leachox™ Refractory Gold Process – The Testing, …

For refractory sulphide ore bodies Imhoflot pneumatic flotation would normally be the first step of the Leachox process to produce a high grade, low mass concentrate from a combination of V-cells and G-cells. The term pneumatic flotation is generally associated with flotation where the aeration of the

Refractory Sulfide Ores—Case Studies - ScienceDirect

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.

GOLD RECOVERY OF REFRACTORY SULFIDE …

The refractory sulfide gold ore used in this study was the flotation concentrate of refractory sulfide gold ore, provided by PT USA, a small-scale gold mining in West Java. For experimental tests, the ore sample was prepared by grinding and sieving and …

Sulphidic refractory gold ore pre-treatment by selective ...

Abstract. In sulphidic refractory gold ores, fine gold particles may be highly disseminated and locked up in sulphide minerals such as pyrite and arsenopyrite. Hence, pre-treating processes are necessary to extract gold for further processing methods like cyanidation. In this paper, the selective and bulk flotation methods are considered as ...

Sulfide Minerals Bio-Oxidation of a Low-Grade Refractory ...

Download Citation | Sulfide Minerals Bio-Oxidation of a Low-Grade Refractory Gold Ore | This paper describes the oxidative dissolution …

A Comparison of Refractory Lined Carbon Steel and …

Refractory gold sulphide ore treatment Acid Pressure Leaching 180 1730 Alkaline Carbonate Leach 120 350 Oxidative leaching of uranium, rare earth ores Freeport McMoRan Process 160 2000 CESL Process – Chloride assisted partial oxidation 130 – 155 1100 - 1275 ...

Process for treating refractory gold ores by roasting ...

Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after …

Recovery Refractory Resources - SGS

sulphide flotation, often precede the pre-treatment processes. By reducing the volume of ore going in to the pre-treat-ment process, the size of the equipment needed is also decreased. "The infrastructure needed for refractory gold processing varies depending on the method chosen," says Rachel Bridge, metallurgist at Hatch. "The

Recovery of gold from sulfide refractory gold ore: …

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 ...

Atmospheric alkaline pre-oxidation of refractory sulphide ...

Atmospheric alkaline pre-oxidation of refractory sulphide gold ores. Creator. Rego, Alan Joseph. Publisher. University of British Columbia. Date Issued. 2018. Description. Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to ...

Sulfide Minerals Bio-Oxidation of a Low-Grade Refractory ...

This paper describes the oxidative dissolution kinetics of sulfides with gold occlusion within pyrite and arsenopyrite. Shake flasks tests and column leaching of a low grade gold ore from China were carried out with domesticated mixed acidophiles isolated from acid mine drainage. Both test show that the main factors accelerating sulfide oxidation was mainly temperature and redox …

Pre-Oxidation of a Refractory Sulphide Gold Ore in ...

Pre-Oxidation of a Refractory Sulphide Gold Ore in Alkaline Media. The Eldorado Gold Corp. has developed a method of treating a hard-to-process ore from a mine in China in order to increase their recovery of gold. While this process has proven to be effective, more research is needed on the exact method in which this technique works on a very ...

Recovery of gold from sulfide refractory gold ore ...

The major chemical components of the sulfide refractory gold ore and pyrite are shown in Table 2. The sulfide refractory gold ore (SRGO) contains 30.34% Fe, 22.23% S, 11.19% As, 3.24% Al and 60.25 g/t Au. The total content of Fe, As and S is up to 63% of the sulfide refractory gold ore. The pyrite contains 43.36% Fe and 41.26% S.

Refractory sulfide ores – case studies - ScienceDirect

This chapter presents three examples of projects completed by GRD Minproc to illustrate refractory ore-treatment process. The Sansu case study highlights the amount of work and detail required to introduce what was at that time a relatively new technology, on a scale that was significantly greater than anything attempted previously.