In:
Metallurgical Research & Technology, EDP Sciences, Vol. 116, No. 3 ( 2019), p. 320-
Abstract:
In this paper, a cycle of Fe 3+ electro-oxidation regeneration and galena leaching with regenerated Fe 3+ has been established. The whole investigation can be divided into three parts, respectively. Fe 3+ regeneration, galena leaching with regenerated Fe 3+ , and the cycle of the two processes. In the first part, the relationship between the relevant parameters and Fe 3+ regeneration was investigated, and it has been revealed that the increases of anodic current density, Cl − concentration and H + concentration are beneficial to the Fe 3+ regeneration. With 95.5% Fe 3+ regeneration acquired, the appropriate regeneration conditions are determined as follows: Fe 2+ concentration = 0.4 mol/L, Cl − concentration = 3 mol/L, H + concentration = 4 mol/L, anodic current density = 1789 A/m 2 , initial Fe 3+ / Fe 2+ ratio = 0, electric quantity = 3 Ah, agitation speed = 400 rpm. With galena leaching by regenerated Fe 3+ , the effects of temperature, S/L ratio and leaching time have been investigated, and the leaching rate of 87.3% can be realized in just 12 minutes under the optimized conditions that temperature = 90 °C, S/L ratio = 40 g/L, agitation speed = 600 rpm. In the last part, the cycle of Fe 3+ regeneration-galena leaching was tested, the comparison of the results from the two groups of experiments, in which the supply of H + after Fe 3+ regeneration was provided in one group, yet not in the other, indicates that the electro-oxidation regeneration of Fe 3+ is at the expense of the consumption of H + and the cycle could run stably with acquiring satisfying regeneration percentage and leaching rate if the H + provided.
Type of Medium:
Online Resource
ISSN:
2271-3646
,
2271-3654
DOI:
10.1051/metal/2018108
Language:
English
Publisher:
EDP Sciences
Publication Date:
2019
detail.hit.zdb_id:
2780264-4
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