pretreatment of refractory gold ore with microwaves

pretreatment of refractory gold ore with microwaves

Microwave pretreatment of a double refractory gold ore ...

Sep 01, 2007  With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%. However, there is no information published on the microwave processing of the double refractory gold ores.

Read More
Microwave pretreatment of a double refractory gold ore ...

Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon.

Read More
MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY

Jan 01, 1987  Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate. More than 80% of As and S were volatilized off as As 2 O 3 and SO 2; whereas iron was oxidized mostly to hematite (Fe 2 O 3).All the gold was present in the calcine which responded favourably to the conventional alkaline cyanidation process and yielded 98% of Au and 60% of Ag

Read More
Microwave pretreatment of a double refractory gold ore ...

Microwave pretreatment of a double refractory gold ore. Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic ...

Read More
pretreatment of refractory gold ore with microwaves

The microwave pretreatment processes of refractory gold ores in solid and slurry, and effects of the microwave. This page is about pretreatment of refractory gold ore with microwaves in johannesburg gauteng south africa, click here to get more infomation about .

Read More
Pretreatment Process on Refractory Gold Ores with As

Kyuesi and Haque, etc. have studied the role of microwave in the gold extraction process of arsenic-bearing refractory gold ore. 8,9) Haque K E used microwave to dispose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%. 10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without ...

Read More
Review Pretreatment Process on Refractory Gold Ores with As

refractory gold ore.8,9) Haque K E used microwave to dis-pose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%.10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without micro-wave pretreatment could be hardly leached in cya-nide. On the other hand the cyanide leaching of gold ore

Read More
MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD ...

Jan 01, 1987  Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate. More than 80% of As and S were volatilized off as As 2 O 3 and SO 2; whereas iron was oxidized mostly to hematite (Fe 2 O 3).All the gold was present in the calcine which responded favourably to the conventional alkaline cyanidation process and yielded 98% of Au and 60% of Ag

Read More
pretreatment of refractory gold ore with microwaves

The microwave pretreatment processes of refractory gold ores in solid and slurry, and effects of the microwave. This page is about pretreatment of refractory gold ore with microwaves in johannesburg gauteng south africa, click here to get more infomation about .

Read More
Microwave pretreatment of a double refractory gold ore ...

Microwave pretreatment of a double refractory gold ore. Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic ...

Read More
Study on Pretreatment of Refractory Gold Ore by Microwave ...

Microwave roasting method was applied for the pretreatment of refractory gold ore (RGO). The occurrence,phase of gold and microstructure of roasted product were analyzed. The results showed that gold existed in tiny granular gold and sub-micro grain gold,the occurrence form of gold was mainly in gold-bearing sulfides and gold-bearing quartz. So pretreatment was required to break gold-bearing ...

Read More
Leaching of Refractory Gold Ores by Microwave Irradiation ...

Dec 10, 2013  The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold ores. Characteristics of the crystal structure and microstructure of the ores were determined by x-ray structural analysis (XRD) and scanning electron microscopy (SEM) before and after microwave irradiation. Compared to conventional processes, microwave leaching

Read More
Pretreatment of a refractory arsenopyritic gold ore using ...

Mar 01, 2015  An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively. Up to 81% of the gold and 50% of the silver were recovered after ...

Read More
Pretreatment Process on Refractory Gold Ores with As

1. Introduction. Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

Read More
Microwave energy for mineral treatment processes—a brief ...

Jul 01, 1999  This review is a brief account of RD results generated from microwave-assisted mineral treatments tests. The RD results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon

Read More
The reasons of gold refractory, Gold ore classification ...

Nov 28, 2016  The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.

Read More
Microwave energy for mineral treatment processes—a brief ...

The RD results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management. However, challenges remain to be ...

Read More
Research status of carbonaceous matter in carbonaceous ...

The gold ores mainly are categorized into two types: non-refractory and refractory. With the increasing exhaustion of non-refractory gold ores, refractory gold ores have become main materials of the gold industry, and nearly one third of gold comes from refractory gold ores all over the world [1]. Carbonaceous refractory gold

Read More
Optimizing the alkaline oxidation pretreatment of a ...

Sep 28, 2018  Sodium hydroxide was used for pretreatment of the refractory gold–silver ore from the Akoluk deposit. The alkaline pretreatment process significantly improved the gold recovery from 49.3% to 85.4%. Hasab et al : Combining sulfide oxidation and gold

Read More
Potential pre-treatment and processing routes for recovery ...

2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques (Haque, 1987).

Read More
Microwave Pretreatment of Refractory Gold Ores ...

The microwave pretreatment processes of refractory gold ores in solid and slurry, and effects of the microwave pretreatment on cyanide leaching are investigated The mechanism of microwave pretreatment is described The cyanide leaching recovery of Au in the sample A is up to 86 50%~89 19% with the solid microwave pretreatment, and the cyanide leaching recovery of Au in sample B

Read More
Pretreatment Process on Refractory Gold Ores with As

1. Introduction. Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

Read More
Pretreatment of arsenic-bearing gold ore with microwave ...

Jun 01, 2016  Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Pretreatment of arsenic-bearing gold ore with microwave-assisted alkaline leaching Ma, Hongzhou; Yan, Chao; Wang, Yaoning 2016-06-01 00:00:00 In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and sodium hydroxide leaching with microwave irradiation

Read More
Ultrasound-intensified Leaching of Gold from a Refractory Ore

technique in pretreatment and leaching for the refractory gold ores. KEY WORDS: gold ore; intensified leaching; ultrasound. 1. Introduction Cyanide leaching has been applied to separate gold from ore for over 120 years. Gold ores can be classified as free milling, complex, or refractory based on gold recovery achievable by direct cyanidation.

Read More
Extraction of Gold from a Low-Grade Double Refractory Gold ...

The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was only 11.75%. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed.

Read More
Treatment of Refractory Gold Ores SpringerLink

Abstract. Problem ores that yield low (say less than 80%) gold recovery by cyanidation when “normally ground” are defined as refractory. The term, as well as the technical methods used to treat such ores, are relatively new. Rose and Newman’s very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its ...

Read More
Process for treating refractory gold ores by roasting ...

Feb 01, 2000  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 roasting pretreatment

Read More
Optimizing the alkaline oxidation pretreatment of a ...

Sep 28, 2018  Sodium hydroxide was used for pretreatment of the refractory gold–silver ore from the Akoluk deposit. The alkaline pretreatment process significantly improved the gold recovery from 49.3% to 85.4%. Hasab et al : Combining sulfide oxidation and gold

Read More
Improvement of Gold Leaching from a Refractory Gold ...

Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores [1].

Read More
Numerical modeling microwave roasting of refractory gold ore

The mathematical model was applied to two types of refractory gold ores viz. carbonaceous and sulfidic gold ores. The model was tested for three different power levels of 133, 298 and 531 kW/sq.m . The temperatures predicted by the model and the transient temperature plots which enable control of temperature are presented here. The temperatures ...

Read More
TREATMENT OF A COPPER - RICH GOLD ORE BY AMMONIA

TREATMENT OF A COPPER- RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING Figure 4. Effect of Pb(NO. 3) 2. on the extraction of gold (NaCN: 1.5 g/L) The pretreatment of the ore by ammonia (1 M) was therefore, investigatedin an attempt to remove easily solubilised copper ahead of

Read More
难处理金矿预处理方法研究现状-《有色金属科学与工程》

Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion[J]. Hydrometallurgy, 2015, 153: 106–113. [15].AFENYA PM. Treatment of carbonaceous refractory gold ores[J]. Minerals Engineering, 1991, 91 (4): 1043–1055. [16].ADAMA M.D., BURGER A M. Characterization and blinding of carbonaceous preg-robbers in gold ores[J].

Read More
Research status of carbonaceous matter in carbonaceous ...

The gold ores mainly are categorized into two types: non-refractory and refractory. With the increasing exhaustion of non-refractory gold ores, refractory gold ores have become main materials of the gold industry, and nearly one third of gold comes from refractory gold ores all over the world [1]. Carbonaceous refractory gold

Read More