Erschienen in:IOP Conference Series: Earth and Environmental Science
Sprache:
Nicht zu entscheiden
DOI:
10.1088/1755-1315/295/5/052026
ISSN:
1755-1307;
1755-1315
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title>
<jats:p>In lab-scale experiments of oxidative pressure leaching of sphalerite, an interesting phenomenon is that the leaching liquor looks three main colors: black, red and green. In on-going work, semi-quantitative study is carried out to investigate such phenomenon, including drawing of predominance area color diagram, effect of sulfur surfactant on color of leaching liquor, color and stability of oxidation of leaching liquor. Experimental results show that color of the leaching liquor depends on leaching condition mainly including temperature, dissolved oxygen concentration, that experimental results show sulfur surfactant has no effect on the color of leaching liquor, that, with increased molar ratio of elemental sulfur and sodium sulfide, <jats:inline-formula>
<jats:tex-math>
<?CDATA ${S}_{x}^{2-}$?>
</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="block" overflow="scroll">
<mml:mrow>
<mml:msubsup>
<mml:mi>S</mml:mi>
<mml:mi>x</mml:mi>
<mml:mrow>
<mml:mn>2</mml:mn>
<mml:mo>−</mml:mo>
</mml:mrow>
</mml:msubsup>
</mml:mrow>
</mml:math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="EES_295_5_052026_ieqn1.gif" xlink:type="simple" />
</jats:inline-formula>, <jats:italic>x</jats:italic> = 1 ∼ 8 is more stable, and that in oxidation of aqueous sulfide anion, to achieve reasonable fast oxidation kinetic, temperature of 150 °C and oxygen pressure of 2 × 10<jats:sup>5</jats:sup> Pa is the minimum required conditions, which is coincide with such conditions to achieve reasonable fast oxidation kinetic in oxidation of aqueous ferrous iron. In this paper, different reaction mechanisms in given leaching condition were discussed.</jats:p>