Can Nitric Acid Extract Gold From Sulfide Ore

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A Method for Leaching or Dissolving Gold from …

content was measured by reacting it with sulfuric acid and hydrogen peroxide and measuring the oxygen evolved by gas analysis using a Lunge burette.14 Reducing reactant for precipitating gold such as iron (II) sulfate and oxalic acid were all ACS grade and both purchased from Fisher Scientific.

How to Extract Precious Metals From Sulfides | Sciencing

Precious metals can be found in ore deposits along with sulfur, and are known as sulfides. Cadmium, cobalt, copper, lead, molybdenum, nickel, silver, zinc, and gold and platinum group metals can be found in sulfide forms.

Refining Electronic Scrap---- Can't get nitric acid any …

A. Nitric acid will dissolve most base metals if the gold content is about 25% or less. If higher, the undissolved gold will coat the bar and block penetration of the acid. Hot dilute nitric (cut at least 50% with water, by volume) will work better than concentrated nitric.

sulfide and oxide gold ore - railwayrecruitment2017.co

gold - mine engineer com provides mining gold copper coal . gold nugget on pyrite notice pyrite has flat surfaces and a brassy color gold has neither this is a complex gold ore with oxide gold in a quartz vein with sulfide gold the sulfide gold is too fine to see it was probably hydrothermally deposited as a replacement for the iron and pyrites ...

EXTRACTING METALS FROM SULFIDE ORES - InvestorsHub

Electrowinning has become the exclusive choice for recovering copper following leaching of oxide or sulfide ores and solvent extraction. SX/EW produced more than 3 million tonnes of copper in 2003, about 20% of total world copper production.

Cyanide leaching of gold in solutions containing sulfide ...

Request PDF on ResearchGate | Cyanide leaching of gold in solutions containing sulfide | A large proportion of the gold processed in the 21st century will be recovered from sulfide ores. Since the sulfide minerals are to some extent soluble in cyanide solutions, there will always be some sulfur species present in the leach solution.

EXTRACTING METALS FROM SULFIDE ORES - …

Biochemical oxidation of the sulfide minerals releases the gold and allows it to be leached by the chemicals used in conventional gold leaching. Biochemical processes are being developed for the treatment of copper, nickel and cobalt sulfide ores and are expected to become the major method for recovery of these metals in the future.

PRE-TREATMENT OF A REFRACTORY GOLD SULFIDE …

of gold particles with precipitates (specially iron hydroxides) during the cyanidation under alkaline conditions. Andacollo is a gold sulfide ore coming from Andacollo area in the northwest of Neuquén province (Argentina). Gold is present in that ore as submicroscopic particles contained in a pyrite matrix.

Hydrometallurical recovery of copper and zinc from …

Jan 16, 1996· The concentration of the nitric acid is at least 1.5 moles of nitric acid per mole of copper sulfide in the ore concentrate. brief description of the drawings FIG. 1 is a schematic of a flow diagram in which the process of this invention is carried out.

Refining silver from smithing, plating, mine sludges

Refining silver from smithing. ... I refine gold with nitric acid at home, ... The simplest way to extract gold from mixed ore after powdered to over 100 microns?

What is Sulfide Mining? | Mining Action Group

Metallic sulfide mining (aka hard rock mining) is the practice of extracting metals such as nickel, gold and copper from a sulfide-rich ore body. Sulfides are a geologic byproduct of mining in this area, and by exposing sulfides to the air and water in our atmosphere, sulfuric acid can be created — threatening to poison the nearby water, environment, …

Alkaline Sulfide Recovery of Gold | Sulfide | Gold

ALKALINE SULFIDE RECOVERY OF GOLD UTILIZING ... Introduction The use of nitric acid in metal sulfide ... application for treatment of copper sulfide gold ores and ...

Gold(I) sulfide - Revolvy

Gold(I) sulfide is the inorganic ... Gold extraction refers to the processes required to extract gold from its ores . ... nitric acid , can be formed by 2 ...

The characterisation and behaviour of carbonaceous ...

The characterisation and behaviour of carbonaceous ... and gold recovery was unchanged. Nitric acid ... the sulfide ore, however a fulvic acid extract ...

CHLORIDE HYPOCHLORITE OXIDATION AND …

extracting gold from the refractory ores, ... and nitric acid ... Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 65

Recovery of Gold in Pyritic Sulfide Ores - Mine …

Recovery of gold in sulfide ores has fallen into several categories. First is froth flotation, and second is cyanidation of the ores. Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I …

gold ore and citric acid releases - ninanscollege.org

... but it also is really useful to extract gold from ore The gold-mercury amalgam can then , Extracting Citric Acid . ... nitric acid and hydrochloric , "To extract ...

Gold Mining Process Development

with gold molecules. With many sulfide ores, the ore cannot practically be ground down fine enough to expose the gold particles. The objective of pretreatment for these ores is to remove enough of the sulfide so that at least a small portion of all gold particles are directly exposed to the elements. Processes available for treatment all involve …

Gold Treatment With Sulfuric Acid ~ Technology …

Gold treatment with sulfuric acid is the process of dissolution of metals such as zinc, iron and other metal impurities using dilute sulfuric acid (H2SO4) and of the acid treatment process will be easier to concentrate on the stage before the phase of purification of the melting process for making pure gold, because. metallic impurities such as zinc, iron …

Silver processing | Britannica

Metallic silver can be dissolved from gold alloys of less than 30 percent gold by boiling with 30-percent-strength nitric acid in a process referred to as parting. Boiling with concentrated sulfuric acid to separate silver and gold is called affination.

ECONOMICS OF REFRACTORY GOLD ORE …

is controlled by reducing the feed density to 17% solids with the 2% sulfide ore and <10% solids with the 4% sulfide ore. The roasting cases utilize low cost, high sulfur fuel oil when necessary to reach the 650°C operating temperature. The air volume used in all cases is sufficient to leave 4-5% oxygen in the roaster off-gas.

Small Scale Treatment of PM Sulfide Ores - Gold …

Mar 25, 2018· The point is that sulfide ores can be ... gold and silver with nitric acid ... and at that point the final extraction process will be complete. The gold will ...

Rebellious Ores: Sulfides, Selenides and Tellurides

In many locations where they had initially been recovering 90% of the assay values processing oxidized surface ore, with the rebellious sulfide ores they were recovering less than 50%. The rest of the precious metals in their ore simply flowed uselessly out from the mill and into the tailings pond.

Aqua regia - Wikipedia

Aqua regia (/ ˈ r eɪ ɡ i ə, ˈ r iː dʒ i ə /; from Latin, lit. "royal water" or "king's water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals.

How to Extract Gold From Electronics - Instructables

Aug 13, 2014· How to Extract Gold From ... can dissolve gold is aqua regia (nitric acid, ... or mercury to extract trace gold from ore but these are both ...

ON THE ISSUE OF GOLD EXTRACTION FORM PERSISTENT SULFIDE ORES

ON THE ISSUE OF GOLD EXTRACTION FORM PERSISTENT SULFIDE ORES . The Republic of Kazakhstan is ... nitric acid results in the ... of gold extraction from pulp-free ores ...

A Method for Leaching or Dissolving Gold from …

lurgical gold extraction routes utilize a ... A Method for Leaching or Dissolving Gold from Ores or Precious ... with one part of concentrated nitric acid (HNO 3).

Improvements in Plant Scale Nitric-Sulfuric Acid …

Improvements in Plant Scale Nitric-Sulfuric Acid Pressure Leaching of Refractory Sulfide concentrates by Corby G. Anderson, PhD Senior Metallurgical Engineer

processing gold ore with nitric acid - verhuur-doms.be

processing gold ore with nitric acid; how to dissolve gold from ore by acid , can nitric acid extract gold from sulfide ore Description : , Chat Online Get Price

How to Refine Gold With Nitric Acid | Sciencing

Though gold is valuable, the most common sources of gold are rarely pure. Whether it is freshly mined gold ore or a refined gold used in jewelry, contaminants and unwanted minerals are usually present. Nitric acid can be used to refine gold, but you must be careful during the process.

Gold extraction - Wikipedia

Once the ore is mined it can be treated as a whole ore using a dump leaching or heap leaching processes. This is typical of low-grade, oxide deposits. Normally, the ore is crushed and agglomerated prior to heap leaching.

acid method for high cocentration of gold ore

acid method for high cocentration of gold ore. ... Nitric acid or forced air oven oxidation can also be used ... Pre-treatment of a refractory gold sulfide ore by ...

Sulfides - Gold Recovery Methods - ICMJ's Mining …

Sep 04, 2015· Nope, that's wrong. The acid reacts with the sulfides, consuming the acid. If your ore only has traces or tiny amounts of sulfides (like less than 1%), you might be able to reuse it. If there are even a 5 percent sulfides, your ore will eat up the acid and it wont be reusable.

silver refining with nitric acid - Gold Refining Forum

Oct 19, 2012· I submerge my silver concentrate ore in nitric acid and ... group and gold in the ore, can make a big ... float off the sulfide gold and silver ore, ...

Gold Parting using Nitric Acid

An amalgam of mercury, silver, and gold can also be parted by means of nitric acid, but if the gold-silver alloy is rich in gold the separation of silver is incomplete. When gold is parted from such an amalgam it will be found to be in fine crystals.

Nitric acid leaching of silver sulphide precipitates ...

Leaching of silver sulphide precipitates with nitric acid was performed at a variety of temperatures, pressures, acid concentrations and solids concentrations, with a maximum extraction of 96.1% achieved by leaching at 150°C, 1100 kPa(g), and 9.6% solids with twice the stoichiometric amount of nitric acid.

Sulphide Leaching - Mineral Processing & Metallurgy

Methods of leaching sulphide ores can be: ... The oxidizing action of nitric acid and nitrates can be utilized to ... Leaching of an Arsenical Copper Sulfide ...

RECOVERY AND REFINING WITH JUST NITRIC ACID …

add the nitric substitute acid ,just enough to cover the materials. without heating the bath it will take 3 to 10 days for the acid to desolve all the non-gold metals. if you heat the bath it can be finished in hours instead of days.