She couldn't find any but I saw the bottles of PBC etchant. I showed her where it said "ferric chloride" on the bottle. She said she would remember that. I doubt she even works there now. I don't go in that store much but have never encountered the same employee twice. A C Richards. Joined Apr 14, 2006 Messages 3,814. Nov 1, 2009

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In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 7.9% or less of the copper content. This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 1.9 or less of pH. Gold and copper can be effectively leached from the copper sulfide ores.

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The gold extraction rate for raw gold ore under optimum conditions (0.25 M potassium bromate, 0.08 M ferric chloride, 0.4 M hydrochloric acid, extraction time of 5 min, stirring speed of 250 rpm, and liquid-to-solid ratio of 5) was 94.5%. For a gold flotation concentrate, the gold extraction rate was as …

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the gold leaching rate in ferric and cupric chloride solutions solely based on solution properties. 2 Experiments 2.1 Experimental set-up, materials used, and parameters investigated

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The gold extraction rate was investigated by adding different amounts of potassium bromate to the solution (50–110 g) with 0.2 M ferric chloride, 1 M hydrochloric acid, 60 g of gold concentrate, an L/S ratio of 5, an extraction time of 4 h, and a stirring speed of 350 rpm.

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If any gold is still dissolved in the acid, the wet spot will turn a purple-black or a purple-brown. If you see this color change then give the precipitant more time to work and/or add more precipitant. 10. Now all the gold should be drawn out of the solution and the acid should now be a clear amber color with a brown mud settled at the bottom ...

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In ferric chloride leaching, the temperature had a positive effect on the gold dissolution rate. According to Seisko et al. (2018), increasing temperature was shown to result in an increase in redox potential, and to follow the Nernst equation. The …

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This invention provides processes for selectively recovering silver and gold values from feed materials containing both precious metals, and comprises leaching the feed material with a hot ferric chloride-acid brine leach solution for a time sufficient to dissolve the silver, but wherein the gold is not dissolved and remains with the solid residue.

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Wathes has just a few parts that is gold or goldfilled, so take away all the other stuff, as much as possible. Copper ii chloride is a versatile and cheap way of etching copper, but it takes time and Ferric iii chloride may be the same, but will not be regenerated the same way.

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The chemical stability of gold nanorods in different environments is important for a variety of practical applications, because the tiny change in shape and size could directly affect the optical properties of the gold nanorods. Herein we report a chemical etching reaction of the gold nanorods induced by ferric chloride at room temperature.

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Gold dissolution was investigated in ferric chloride solution, being one alternative cyanide-free leaching media of increasing interest. The effect of process variables ([Fe³⁺] = 0.02–1.0 M ...

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Gold (III) chloride hydrate. Gold (III) chloride hydrate. Synonyms: Hydrogen tetrachloroaurate (III) hydrate, Chloroauric acid, Auric chloride, Tetrachloroauric (III) acid. CAS Number: 2. Molecular Weight: 339.79 (anhydrous basis) EC Number:

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The chemical stability of gold nanorods in different environments is important for a variety of practical applications, because the tiny change in shape and size could directly affect the optical properties of the gold nanorods.Herein we report a chemical etching reaction of the gold nanorods induced by ferric chloride at room temperature. In the chemical etching, halide ions act as a ligand ...

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The gold suspension 42 is filtered from the dilute HCl solution by any suitable solid/liquid separation 19 device such as a pressure or vacuum filter, to produce a gold solid 48. The ferric chloride 44 so produced by the reaction for precipitating the gold is recycled to a leaching step 12 where a small amount of feed tailings 9 are added.

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von Bonsdorff (2006) used a maximum chloride concentration of 5.0 M for gold leaching, while Lundström et al. (2016) stated that the chloride concentration in ferric chloride leaching process can be below 120 g L−1 (<3.39 M). However, it must be noted that the optimal chloride concentration depends on raw material, with increasing im-

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Ferric chloride is an orange to brown-black solid. It is slightly soluble in water.It is noncombustible. When wet it is corrosive to aluminum and most metals. Pick up and remove spilled solid before adding water.It is used to treat sewage, industrial waste, to purify water, as an etching agent for engraving circuit boards, and in the manufacture of other chemicals.

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We make ferric chloride, a well-known etchant for printed circuit boards.Get 20g of iron. This can be in the form of nails or steel wool. It's best to use ir...

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These will not etch gold, etc. Phosphoric acid at 60ºC Sodium hydroxide (10% solution) - 2 - Miscellaneous Etchants Chapter 1.10 Trisodium phosphate at 190ºC These will not etch ZnO. Etch rate ~ 100 Å/sec. 10 g K ... Ferric chloride (etch) ...

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Gold dissolution was investigated in ferric chloride solution, being one alternative cyanide-free leaching media of increasing interest. The effect of process variables ([Fe³⁺] = 0.02–1.0 M ...

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What is Gold (III) chloride trihydrate, Product 520918, soluble in? Gold (III) chloride trihydrate is very soluble in water and polar organic solvents. What is the melting point of Gold (III) chloride trihydrate, Product 520918? This product has a melting point of 50 deg …

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MG Chemicals 415 Ferric Chloride Copper Etchant Solution, 945mL Liquid Bottle, 1 Quart (415-1L),Dark Brown. 4.8 out of 5 stars. 1,824. $25.27. $25. . 27. Save more with …

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Ferric Chloride D AB ABD C Ferric Nitrate ADAB Ferric Sulfate ACD AB C B Ferrous Chloride D A B C AB Ferrous Sulfate B AC D A B Fluoboric Acid D B D A AC B Fluorine DDA C Fluosilicic Acid BD D B A A C Formaldehyde 40% AA B BD D Formaldehyde AAB BDD C C ... Gold Monocyanide AD A B — Minor effect — Good 2. Polypropylene — Satisfactory to 72 ...

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I do not disolve the gold it floats in the ferric chloride some of it sinks too but it is very good for removing exposed gold off of fingures and cell boards but mainly fingers it takes about 2 hours to remove the gold this way. I use a tumble and a glass spagahetti jar to keep this agitated.

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Gold (III) chloride hydrate. Synonyms: Hydrogen tetrachloroaurate (III) hydrate, Chloroauric acid, Auric chloride, Tetrachloroauric (III) acid. CAS Number: 2. Molecular Weight: 339.79 (anhydrous basis) EC Number: 240-948-4.

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The Ferric Chloride is safer because it does not have dangerous fumes and produces no underbite if used properly. I purchase a 5 pound bottle of the purified lumps. The lumps keep better than either the liquid or the powder. Ferric Chloride does not etch silver.

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Ferric chloride has none of those risks. However, ferric chloride doesn 't etch everything. In particular, the noble metals: gold, silver, platinum, palladium, tantalum won t etch in ferric chloride. The so-called high temp metals: titanium, molybdenum, tungsten, cobalt, chromium, niobium also do not etch in ferric.

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The highest gold extraction was reached with the highest initial ferric concentration (test 16, 90% extraction), in spite of having the lowest chloride concentration. In other tests, gold extractions were 85% in test 12 and 89% in test 14.

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A ferric chloride (fecl3) preleach, at 40 deg c in 6 h, extracted about 50 pct of the zinc and formed insoluble silver and lead chlorides. Subsequent acid thiourea leaching, for 1 to 3 h at 40 deg c, extracted about 85 pct of the gold and silver. Lead chloride was solubilized from the remaining residue with nacl brine solution at 55 deg c in 1 h.

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USING FERRIC CHLORIDE, THIOUREA, AND BRINE LEACH SOLUTIONS By R. G. Sandberg 1 and J. L. Huiatt 2 ABSTRACT The Bureau of Mines investigated a hydrometallurgical procedure to re­ cover gold, silver, and byproduct lead from a complex lead-zinc sulfide ore. A ferric chloride (FeCI3 ) preleach, at 40° C in 6 h, extracted

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