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10007845 - Centers for Disease Control and Prevention

A ferrous chloride-oxygen leaching system was investigated by the federal Bureau of Mines to determine its effectiveness for recovering copper and silver from a tetrahedrite concentrate that had been pretreated to remove a majority of the antimony. The pretreated concentrate contained copper, silver, lead, zinc, antimony, and arsenic.

EXTRACTING METALS FROM SULFIDE ORES

Mixed oxide and sulfide copper ores are leached following the same process stages as in Figure 4. Also, some sulfidic ores that are too lean to treat by flotation are also leached in heaps or dumps. The recovery of metals from sulfides in this way utilizes bacteria either naturally present or …

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. These concentrated ore deposits are considered low grade because of the economic costs associated ...

Refining of silver chloride to silver metal

February 9, 2009. A. I have used this process in the past to recover laboratory silver residues. By redissolving the silver hydroxide in 50% nitric acid, re-precipitating as the chloride and then reducing to the metal with Sodium Hydroxide and Dextrose (you can use sucrose), you will obtain a purer silver …

Gold Recovery : 8 Steps (with Pictures) - Instructables

Gold Recovery: Wait don't throw those old electronics in the garbage, there's gold in them there things. How about putting it in your pockets instead of someone else's pocket? Laptops, phones, cameras, and the like are filled with gold plated circuit boards eve...

Gold and silver recovery from polymetallic sulfides by ...

Nov 09, 2007· Gold and silver recovery from polymetallic sulfides by treatment with halogens Nov 9, 2007 - Nichromet Extraction Inc. A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper, zinc, lead, nickel, cobalt ...

Pyromet | Photographic Film Silver Recovery

The average silver yields listed below are based on our last five years of production. Silver yields can be higher or lower depending on the age, manufacturer, and application) i.e. x-ray scans, M.R.I. nuclear medicine film, or ratio of black versus clear areas on the film. Sun Valley washes and Pyromet refines each lot of film separately.

Sulfides - Gold Recovery Methods - ICMJ's Mining Journal ...

Sep 04, 2015· It all depends on your sulfide product - what you have to leach. Leaching works poorly on coarser gold - it just takes forever to dissolve. Some types of sulfides react badly with leach systems, destroying the leach chemicals. If you have significant silver in your ore, many non-cyanide leach systems dont recover silver.

Silver extraction from waste hypo/fixer solution

2002. Q. Wish to know about the silver extraction method from waste hypo solution and the details about the machine and tools using the extraction. I am engaged in the business of silver extraction from the waste hypo/fixer and waste photo films. At present even though I am extracting silver successfully my procedure is very lengthy, risky and slow process.

Recovering Silver from Sulphide Concentrates ...

To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Hydrometallurgy. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else ...

Recovery of Gold in Pyritic Sulfide Ores - Mine Engineer.Com

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 have heard of is around 50% recovery.

Sulphide Gold | Gekko

Sulphide Gold Recovery. Pre-concentration of coarse 350 – 500 micron sulphide-associated gold ore, using the InLine Pressure Jig, is required to reject gangue from the high value material.The IPJ, a classic pre-concentration device, is effective in gangue rejection prior to further processing of valuable gold-bearing material.. Other turnkey modular systems for pre-concentrating coarse ...

Copper and silver recovery from a sulfide concentrate by ...

Get this from a library! Copper and silver recovery from a sulfide concentrate by ferrous chloride-oxygen leaching. [Bernard J Scheiner; United States. Bureau of Mines.;] -- A ferrous chloride-oxygen leaching system was investigated by the Federal Bureau of Mines to determine its effectiveness for recovering copper and silver from a tetrahedrite concentrate that had been ...

New approaches for extracting and recovering metals from ...

New approaches for extracting and recovering metals from mine tailings. Author links open overlay panel Carmen Falagán Barry M. Grail D ... During the formation of copper/silver sulfides in the off-line gas bottle, the pH of the PLS declined slightly (from 0.94 to 0.89 for CLC PLS, and from 0.82 to 0.81 for Bor PLS). ... A combined approach ...

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 ...

Silver sulphide (What to do about it ... - GOLD REFINING FORUM

Oct 18, 2011· I've recovered values from sulfides that way with great success. The sulfide layer that I started with changed characteristics considerably in the process. Not guaranteeing it works (in your case), but it can do no harm. If it works, iron will replace the silver in the sulfide, reducing the silver sulfate to elemental silver.

Ferric Chloride Thiourea & Brine Leaching to Recover ...

Table of ContentsOperating Procedure Leaching Ferric ChlorideThioureaBrineSilver and Gold Recovery from ThioureaByproduct Lead Recovery and Spent FeCl3 Leach Solution RecycleProcess For Recovering Of Silver Gold, Lead, & Zinc in Complex Ores Independent mine operators have difficulty marketing complex gold-silver concentrates and ores. Generally, complex sulfide concentrates and …

CA2448999C - Gold and silver recovery from polymetallic ...

A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper, zinc, lead, nickel, cobalt, mercury, tin, and mixtures thereof, is disclosed. The method comprises the steps of grinding the polymetallic sulfide ore to produce granules, oxidizing the granules to ...

Silver Lead Zinc Ore Processing Method using Flotation

This flowsheet successfully answers The Problem by recovering 84% of the total silver in the lead concentrate. Silver, Lead & Zinc Flotation Circuit #2. The recovery of silver minerals occurring in a lead-zinc sulfide ore is efficiently accomplished using the above flowsheet. The process consists of selective flotation to produce a mixed silver ...

Recover Gold/Silver in Jewelry/Electronics eScrap by Aqua ...

STEP 2: Remove silver from solution and purify silver. Add enough water to the acid to double its volume. Drop a small amount of non-iodized table salt into the mixture to check for silver. If silver is present, a white substance will fall to the bottom of the container. This is silver chloride.

US4755453A - Method for recovering silver from waste ...

In a process for recovering silver from spent photographic treatment solution comprises mixing nitric acid with a quantity of the treatment solution to precipitate from the solution silver sulfide. The silver sulfide may be then converted to pure silver. The improvement comprises mixing less than two parts of concentrated nitric acid solution with more than ten parts of the treatment solution ...

Recovery of noble metals from refractory sulfide black ...

The processing of refractory sulfide black-shale ores and concentrates from the Sukhoy Log deposit containing gold, silver and platinum group metals (palladium and platinum) was investigated. The noble metals were leached both under atmospheric pressure and at 700 kPa at 200 °C in an autoclave.

US4053305A - Recovery of copper and silver from sulfide ...

Copper and silver are recovered from complex sulfide ores or concentrates containing, in addition, metals such as lead, zinc, arsenic, antimony, and iron by leaching with a combination of ferrous chloride and oxygen. US4053305A - Recovery of copper and silver from sulfide concentrates - Google Patents Recovery of copper and silver from sulfide ...

Recovery of Silver, Gold, and Lead From a Complex Sulfide ...

silver from sulfide ores with FeC13 was patented by Hey in 1922 (6). Considera­ ble work was completed by-Wong (7) to re­ cover lead from a galena concentrate with a combined FeC13-NaCl leach solution. Because both lead and silver were solu­ bilized, silver recovery from high-silver ore would be …

A Novel Technique for Silver Extraction from Silver ...

A Novel Technique for Silver Extraction from Silver Sulphide Ore S. AYATA, H. YILDIRAN Ege University, Science Faculty, Chemistry Department, 35100, Bornova, Izmir-TURKEY_ Received 07.04.1999 A novel technique for silver extraction from Ag 2S is described. The method utilizes thiosulphate as complexing reagent and the redox reaction between SO ...

Small Scale Treatment of PM Sulfide Ores - Gold Refining ...

Feb 15, 2020· The sulfides contain some galena (lead sulfide) but not enough lead to serve as collector for a full fire assay on that material alone, so I will add some other galena from another source (which also contains some good silver, but very little gold) and some Litharge (plus a bit of charcoal to help reduce the litharge).

US Patent for Process of recovering copper and of ...

A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are treated with an aqueous solution of an alkali cyanide or alkaline earth cyanide, the laden solution is filtered, if desired, a water-soluble sulfide compound is added to the laden solution or filtered ...