Background

acid method for high cocentration of gold ore

acid method for high cocentration of gold ore

acid method for high cocentration of gold ore. A statistical approach to the experimental design of the sulfuric acid ... The high grade of copper in the Igarapé Bahia (Brazil) gold-copper ore ... By using the Plackett Burman method, it was possible to select the variables that had the ... concentration of sulfuric acid in the leach solution ...

METALS AND THEIR ORES

METALS AND THEIR ORES. In some places, the mineral deposits in rock contain a high concentration of one metal. These metal deposits are called ores. An ore is a …

Leaching and recovery of platinum group metals from UG-2 ...

pre-leaching with sulphuric acid to remove soluble minerals, the PGM were leached at ambient temperature with 6M HCl in the presence of oxidant (hydrogen peroxide, chlorine, hypochlorite, or nitric acid). High recoveries (greater than 90 per cent) were obtained for Pt, Pd and Au. A much quoted direct leaching method of late is the

Technical Document: Acid Mine Drainage Prediction

all need better tools to manage acid mine drainage at mine sites. This report examines acid generation prediction methods as they apply to non-coal mining sites. Following a brief review of acid forming processes at mine sites, the report summarizes the current methods used to predict acid formation including sampling, testing, and modeling.

Fire Assay Gold - SGS

gold content and total gold content are reported. GOLD BY LEAD COLLECTION FIRE ASSAY/INSTRUMENT FINISH TRACE LEVELS LIMITS FAA 313 Gold by Fire Assay, AAS, nominal weight 30g 5ppb-10,000ppb FAI313 Gold by Fire Assay, ICP-AES, nominal weight 30g 1 ppb - 10,000 ppb FAI515 Gold by Fire Assay, ICP-AES, nominal weight 30g 1 ppb - 10,000 ppb ORE GRADE

CHAPTER 13 WET DIGESTION METHODS

developed methods for the gravimetric determination of sulfur as sulfate in organic samples. Their method called for the sample to be digested with fuming nitric acid or aqua regia and fused with potassium hydroxide or potassium nitrate. The first published wet digestion reagent was chloric acid from HCl + KClO3, as described in 1838 by

Pyro- Versus Hydrometallurgy or Dry Versus Wet Methods

Treatment of Sulfide Ores Pyrometallurgical treatment of sulfide ore is plagued by the problem of sulfur dioxide generation. If it is in high enough concentration, it must be used for making acid and a nearby market for this acid must be found. If the sulfur dioxide concentration is too low for making acid the gas is simply emitted to the ...

CHAPTER 13 WET DIGESTION METHODS

Chapter 13 227 The majority of wet digestion methods (total decomposition and strong attack) involve the use of some combination of oxidizing acids (HNO3, hot conc. HClO4, hot conc. H2SO4) and non-oxidizing acids (HCl, HF, H3PO4, dilute H2SO4, dilute HClO4) and hydrogen peroxide.

Ultra-Trace Analysis of Metals in Mineral Reference Materials

Method Noront core sample Chromite ore Cr, Fe Phosphoric/sul-furic acid GBM398-1 Copper-lead-zinc cap rock Cu, Ni, Pb, Zn Aqua regia GBM909-15 Nickel sulphide concentrate Cu, Ni, Pb, Zn Aqua regia GBM309-16 Copper-lead-zinc-silver massive sulphide ore Cu, Pb, Zn Aqua regia GIOP-117 High-grade (hematite) iron ore Fe Phosphoric acid

Sulfuric acid leaching of Igarapé Bahia gold-copper ore ...

The high copper grade in the Igarapé Bahia (Brazil) gold-copper ore restricts the direct application of the classical cyanidation process. Copper oxide and sulfide minerals react with cyanides in solution, causing high leach-reagent consumption, raising processing costs and decreasing gold recovery. According to studies, a feasible solution would be to pretreat the ore to remove copper ...

A Method for Leaching or Dissolving Gold From Ores or ...

It is known that gold can be efficiently leached from gold- bearing ores using a mixture of hydrochloric acid, ferric chloride, and manganese dioxide.12 The chemical reaction involved during the ...

Stephen FOLEY, et al. : Gold Extraction

The respective concentration levels within leach liquor were 1600 ppm for gold, 48 ppm for palladium and high levels of other impurities. Following cooling, the chlorination leaching residue was filtered, the acid concentration of the filtrate was adjusted to 1 M, and the filtrate was mixed with equal volume of dichloromethane containing 25 g ...

The process design of gold leaching and carbon-in-pulp ...

concentration of gold in the aqueous phase is typically between 0.001 and 0.02 ppm with a value of 0.01–0.005 ppm regarded as a practically achievable value for most well-designed and operated plants. This represents a gold recovery of 90–99% depending on the tenor of the feed solution. These high recoveries are achieved because the carbon is

LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY …

Serbia (the approximate Cu content in the ore ranges from 0.2 - 0.3 % with >10 % copper in the form of oxide minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in

3. Reviewing a Typical EIA for a Mining Project

3.2.1.2 Alternative ore beneficiation methods Mining companies often have a choice of 'beneficiation' methods to concentrate the desired metals in the metallic ore they have mined. Some ore beneficiation methods have less serious impacts than others. For example, …

Photos of gold ores, quartz, telluride gold ore and gold ...

Gold and silver are obtained from a variety of ores. Most people think of nuggets and such, but the truth is that very little comes from nuggets - nearly all newly mined gold comes from ores mined from the natural hard rocks that contain gold in tiny, even microscopic particles.

Diagnostic Leaching For Refractory Gold Ores | SRK Consulting

The sulfuric acid leach residue is then subjected to cyanidation and a sample of the residue is assayed for gold. Stage 4: Leach residue from Stage 3 is reacted in a hot nitric acid leach to dissolve more resistant sulfide minerals, such as pyrite and arsenopyrite, and liberate any gold that might be locked in these minerals. The residue is ...

QUANTITATIVE ANALYSIS OF GOLD CONCENTRATE USING …

placer (2). Gold ore containing silver (10-15%), less copper, iron, metals Bi, Pb, Sn, Zn, and platinum in small quantities (2). The gold is separated from other metal elements to obtain pure gold. In the geological samples, the concentration of gold is very low to-gether with the high concentration of matrix components that often

Hg Removal - Sulphuric Acid

The acid concentration is maintained between 20 and 40%. At lower concentrations selenium will form highly soluble selenium-sulphur compounds making it ineffective in reacting with the mercury in the gas. At higher acid concentrations, the oxidizing power of the …

Acid Method for the Digestion of Gold Ore Samples

Acid Method for the Digestion of Gold Ore Samples. Solutions to this problem typically propose the use of larger sample sizes, typically 30 g or greater. 3 Furthermore, when …

Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of ...

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF …

gold recovery. However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), re-spectively, increased the gold recovery to 98.1%. This shows that the ore is a sulfide refractory gold ore (Saba et al., 2011).

Method for leaching gold - Nippon Mining & Metals Co., Ltd.

The invention claimed is: 1. A method for leaching gold from a copper sulfide ore containing gold comprising: leaching copper down to 7.9% or less of copper content to form a leach residue containing the gold, bringing the leach residue of said copper sulfide ore containing gold into contact with a leaching solution that dissolves ferrous ion, ferric ion and chloride ion, thereby leaching the ...

ATOMIC ABSORPTION SPECTROPHOTOMETRY …

1.0mg Au/ml Standard material : Gold : 0.100g of high purity gold is dissolved in several ml of aqua regia and vaporized to dryness on water bath. Then, lml of hydrochloric acid is added and vaporized to dryness. It is dissolved in hydrochloric acid and water and diluted with water to 100ml accurately. Hydrochloric acid concentration is set at ...

(PDF) Characterization and Gold Assaying Methods in the ...

Towards a general acid-based method for the determination of gold in ore samples by inductively-coupled plasma-mass spectrometry (ICP-MS), together with an investigation of solvent extraction of ...

Gold Processing Methods & Gold Ore Extraction

Gold Processing Methods & Gold Ore Extraction. Of all the methods of extracting gold & processing it from its ore, I used a few to evaluate two principal flowsheets in this case study. The flowsheets utilized operations that involved flotation, cyanidation and gravity concentration. Tests that mirror each of these unit operations were utilized ...

Extraction of Metals: Concentration of Ore, Refining of ...

The first step in metallurgy is to remove these unwanted impurities from the ore, to get a concentrated ore containing a much higher percentage of the metal. The method used to remove gangue from ore depends on the physical or chemical properties of the gangue and ores. Some of the methods used in the concentration of the ore include, 1.

Uranium Mining and Extraction from Ore

The chemistry of these processes is very similar to the extraction methods, except that the leaching solution is pumped into the uranium ore while it is still in the ground. [2,5] Fig. 3 shows a schematic of the in-situ leaching process, in which the leaching solution …

Gold & Silver Analysis - Assay Office

An alternative method may be used depending upon the concentration of gold. Fire Assay – ICP-OES technique for low to medium grade powder/ore samples: A fusion collection, followed by cupellation, dissolution of the precious metal bead in an …

A Straightforward Route to Tetrachloroauric Acid from Gold ...

dissolve gold and form gold(III) chloride, but this process requires cumbersome workup procedures (such as boiling down and repeated hydrochloric acid dilution/concentration cycles to remove nitric acid). Thus, the method that we report here offers several advantages over …

Determination of gold and silver in geological samples by ...

Fig. 1, Fig. 2, Fig. 3, Fig. 4 show that, as the relative concentration of nitric acid increases, and the concentration of hydrochloric acid diminishes, the recovery of gold increases. Complex and competitive redox reactions take place and work to convert elemental gold to stable tetrachloroaurate(III) species (reaction (1) ).

Amino acids key to new gold leaching process

He says it can be used to more easily extract gold from poly-metallic ores, such as copper-gold ores, by staging the extractions. Amino acids dissolve copper at …

Determination of Gold in Soils President's Message and ...

insights into how to determine the optimal method to use based on the type of exploration or analytical program. To illustrate the utility of both methods, we also present a case study where we have analyzed more than 2000 soil samples by both fi re assay and aqua regia digestion. GOLD BY FIRE ASSAY Fire assay (FA) is a fusion technique that ...