Recovery of metals from ores
a technology of metal recovery and ores, applied in the field of cyanide-free and mercury-free aqueous chemical processes and solutions for the recovery of metals, can solve problems such as insufficient potency
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example 1
[0049]Refer to the plant 100 in FIG. 1. Ore enters the process at mill 102 and leaves the process, optionally to be recycled, at exit 114 after separation in a hydrocyclone 113. Liquid is recycled through the four connected tanks. 101 is the stirrable reaction tank, 103 holds recyclable liquid for re-use, 119 is a tank used for mixing fresh batches of the oxidising solution or for rejuvenating recycled solution (recyclable liquid) and 115 is a tank for holding pregnant liquors for separation of recovered metals (if present) within separating means 116. The tanks may be made of steel or stainless steel, preferably coated with a paint or other polymer. Alternatively, plastics materials may be used. Polypropylene is suitable.
[0050]In order to commence a new batch, water 108, optionally existing recyclable liquid 103, and reagents 104, 105, 106, 107 (see list below) and ozone from the gas generator 109 are placed in tank 119, and thoroughly stirred as indica...
example 2
Recirculating Batch Plant Layout
[0064]See FIG. 2. This layout 200 extends the principles shown in FIG. 1 and includes a parallel set of processes. In this example, three sets of metal extraction lines, such as for copper (A), silver (B) and gold (C) and their associated tanks are supplied with an oxidising solution from a single set of a mixing tank 119 and a reaction tank 101 (which is shown with the slurry settled and a supernatant ready to be drawn by selective operation of valves into an appropriate metal extraction line). There is again a single path for ore, from ore mill 102 to the output 114 of spent ore from a hydrocyclone 113. The ore is exposed to more and more active aqueous solutions in a planned sequence.
[0065]The preferred way to use a plant constructed according to this layout is to treat a mixed ore, which might for example contain copper, zinc, and gold, in a sequence, with each subsequent stage applying a higher reduction potential Eh and a lower pH within the oxi...
example 3
Solution for Example 3
[0083]
Hydrochloric Acid, commercial concentrated84litresSodium Persulphate0.9kgSodium Bromide1.8kgHydrogen Peroxide, commercial strength (ca 30%)1.6litresWater to make up:1000litres
[0084]All amounts are approximate.
[0085]Notes:
[0086]1. Potassium or ammonium salts are acceptable substitutes for sodium salts.
[0087]2. During use, sufficient suitably finely ground ore, for instance an ore milled to a mean particle size of about 100-150 microns, is added to provide a pulp ratio of 0.5%.
[0088]3. During use, ozone is continuously added to the solution from an ozone generator operated beside the apparatus at a rate of about 12 grams per 1000 litres per hour.
[0089]Results
[0090]1. Samples were assayed for a mine in the Philippines. Some recovered grades are given below. (Note that the common head grade of these samples is almost zero.)
AGR Matthey Assay No.Gold Recovery (ppm)18321031218321119218321216818321373218321496183215144183216164183217601831986360183199729618320044...
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Abstract
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