Method for recovery of non-ferrous metals from solid substrates
A solid matrix, non-ferrous metal technology, applied in the direction of improving process efficiency, etc., can solve the problems that it cannot be used in different production environments, the recovery method is not particularly flexible, and the metal recovery rate has a great impact
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Embodiment 1
[0144] 1 kg of residue originating from the hydrometallurgical treatment of lead concentrate was subjected to the process of the invention as described below.
[0145] The metal content (weight percent) of the residue is as follows:
[0146]
[0147] In the presence of oxygen, at a pressure of 350kPa and 120°C, use 20L containing 200g / L NH 4 Cl, 100g / L NaCl and 12.23g / L zinc (Zn 2+ ), the residue in powder form was subjected to leaching for 2 hours.
[0148] The zinc ions present in the leach solution originate from the electrolytic solution recycled from the previous recovery cycle after the electrodeposition of metallic zinc.
[0149] At the end of leaching, the metal ion content of the extraction solution was as follows:
[0150]
[0151]
[0152] 0.05 g of zinc powder was added to the extraction solution to precipitate a replacement precipitate mainly comprising metallic silver. The displacement of the precipitated silver takes place in two consecutive stages....
Embodiment 2
[0171] 1 kg of the same residue treated in Example 1 was subjected to leaching under the same conditions indicated in Example 1, but using 25 L containing 200 g / L NH 4 Cl, 100g / L NaCl, 1g / L Cu 2+ ions and a leach solution of 12.23 g / L zinc.
[0172] According to the same procedure indicated in Example 1, displacement precipitation and subsequent electrolysis of the final extraction solution were carried out. The relevant analytical data are shown in Table 2 below.
[0173] Table 2
[0174]
[0175] 1. Percentage by weight relative to the weight of the recovered replacement sediment
[0176] 2. Number of stages
[0177] 3. The content of Ni and Co in the replacement precipitate: 53.5% Ni; 43.4% Co
[0178] 4. Zn measured in solution undergoing electrolysis 2+ ion content
[0179] 5. The amount of metal Zn deposited on the cathode in electrolysis
[0180] The final extraction solution was subjected to electrolysis under the same conditions indicated in Example 1, de...
Embodiment 3
[0184] The method of the present invention is used to recover non-ferrous metals contained in a solid matrix consisting of a primary zinc concentrate composed (in weight percent) as follows:
[0185]
[0186] 400 g of the above primary concentrate were subjected to leaching under the same conditions indicated in Example 1, but using 23 L containing 200 g / L NH 4 A solution of Cl, 100g / L NaCl and 12.23g / L Zinc.
[0187] The composition of the extraction solution is as follows:
[0188]
[0189]
[0190] The extraction solution was treated in two stages with 4.8 g of zinc powder, obtaining 11.8 g of a displacement precipitate with the following composition: Pb 84.3%, Cu 8.5%, Zn 3.0%, Ni 1.6%, Co 1.5% and Ag 1.0%.
[0191] The supernatant solution contained 22.2 g / L zinc ions, while the concentrations of other metals were as follows: Ag + 2+ 1.3mg / L, Pb 2+ 1.4mg / L, Co 2+ 2+ <1mg / L.
[0192] The supernatant solution was subjected to electrolysis under the same condit...
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