Abstract
A lot of industries (chemical, mining) developed numerous processes based on the use of the adsorption, From then on, the resolution of practice problems pass inevitably by the understanding of fundamental concepts governing the phenomena of flotation and the interaction in the solid- liquid or solid - gas interface. In this study, we suggest proceeding to a theoretical and experimental study concerning the organic synthesis of an organo metallic product (KEX) by intermittent method and their use in the processes of sulphides flotation. Searches showed that the surface state after grinding resulted from a combination of oxidized sorts of sulfur treat type with copper sulphate and lead oxy-hydroxide thickness of which is very superior to 200 nm. The addition of an organometallic molecule sulphurated (Potassium ethyl xanthate KEX) in available concentrations of 1g/l (6, 24.10 -3 M) is going to lead the forming of an organometallic layer mixed in the galena surface. From weak concentrations in collector, the organometallic layer present in the mineral surface is mixed. It is formed by a complex xanthate type of lead (PbX, bandages IR in 1200 cm -1 ), of dixanthogene (X2 forms oxidized with the molecule of xanthate, bandages IR in 1262 cm -1 ), of elementary sulfur and a certain proportion of initial superficial oxidized phases. The mechanism leading to the forming of PbX is the type of ionic exchanges. On the other hand, two types of different mechanisms can be at the origin of dixanthogene forming (X2). A first type consists of a catalytic oxidation in the mineral surface with reduction of the dissolved oxygen. This type of mechanism depends essentially on the potential redox of the system. A second type brings in the forming of xanthate salts of lead by a mechanism of Ionic exchange (eq. 1) then their catalytic degradation (eq. 2): Pb n + + n X - → (Pb X) n Equation 1: independent from the potential redox. Pb(X) n (catal. by PbS) + 1/2 O2 + n/2 H2O → Pb (OH) n + n/2 X2 Equation 2: dependent on the redox potential.
Highlights
A lot of industries developed numerous processes based on the use of the adsorption, what means in big part a good mastery of the superficial ability to react of the used solids
The resolution of practice problems pass inevitably by the understanding of fundamental concepts governing the phenomena of flotation and the interaction in the solidliquid or solid - gas interface
Characterization of potassium ethyl xanthate (KEX) synthetized with the electron microscope with sweeping (MEB): The principle of the sweeping consists in investigating the surface of the sample by successive lines and in passing on the signal of the detector to a cathode-ray screen sweeping of which is exactly synchronized with the one of the incidental bundle
Summary
A lot of industries (chemical, mining,) developed numerous processes based on the use of the adsorption, what means in big part a good mastery of the superficial ability to react of the used solids. The resolution of practice problems pass inevitably by the understanding of fundamental concepts governing the phenomena of flotation and the interaction in the solidliquid or solid - gas interface. The knowledge of the composition variations of the ore to be dealt, reproduces the concentration of the reagent in the pulp determine the results of the flotation. This research aims to better understand the phenomena of interaction (adsorption, haste,) of typical organic molecules thiols (Xanthate) on natural solid (sulphides). The control and the regulation of the reagent concentration in the pulp is practically the only way of the establishment of an automatic system and an optimal regime of the reagent and an obtaining of a possible maximum of indication of flotation with a minimal consumption of the reagent of flotation [1,2,3,4,5,6,7,8,9,10]
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