Statistical Evaluation and Optimization of Factors Affecting the Leaching Performance of Copper Flotation Waste

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td align="left">Factors</td><td align="center">Symbols</td><td align="center">Low level (−1)</td><td align="center">High level (+1)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td align="left">pH</td><td align="center"><span style="width: 18.5625px;"><svg height="14.2375" id="M4" style="vertical-align:-3.13504pt" version="1.1" viewbox="0 0 18.5625 14.2375" width="18.5625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.2375)">
<g transform="translate(72,-60.61)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑋</tspan>
</text>
<text transform="matrix(1,0,0,-1,-62.07,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">1</tspan>
</text>
</g>
</g>
</svg></span></td><td align="center">3</td><td align="center">9</td></tr><tr><td align="left">Stirring time (minutes)</td><td align="center"><span style="width: 18.5625px;"><svg height="14.2375" id="M5" style="vertical-align:-3.13504pt" version="1.1" viewbox="0 0 18.5625 14.2375" width="18.5625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.2375)">
<g transform="translate(72,-60.61)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑋</tspan>
</text>
<text transform="matrix(1,0,0,-1,-62.07,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">2</tspan>
</text>
</g>
</g>
</svg></span></td><td align="center">5</td><td align="center">150</td></tr><tr><td align="left">Temperature (°C)</td><td align="center"><span style="width: 18.5625px;"><svg height="14.3875" id="M6" style="vertical-align:-3.25793pt" version="1.1" viewbox="0 0 18.5625 14.3875" width="18.5625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.3875)">
<g transform="translate(72,-60.49)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑋</tspan>
</text>
<text transform="matrix(1,0,0,-1,-62.07,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">3</tspan>
</text>
</g>
</g>
</svg></span></td><td align="center">20</td><td align="center">60</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

The levels of experimental factors for the full factorial design.

The Scientific World Journal

tab2

Table 2

Table 2: Statistical Evaluation and Optimization of Factors Affecting the Leaching Performance of Copper Flotation Waste 