## 6 Experiment
\begin{table}
\begin{tabular}{c c c c} \hline
**Test No.** & **Copper Ore Type** & **Particle Fraction (\(\mu\)m)** & **Collector Type** & **Collector Dose (g/Mg)** \\ \hline
49 & & 0–20 & E & 100 \\
50 & & 0–20 & E & 150 \\
51 & & 0–20 & Z & 100 \\
52 & & 0–20 & Z & 150 \\
53 & & 20–40 & E & 100 \\
54 & & 20–40 & E & 150 \\
55 & & 20–40 & Z & 100 \\
56 & & 20–40 & Z & 150 \\
57 & & 40–71 & E & 100 \\
58 & & 40–71 & E & 150 \\
59 & & 40–71 & Z & 100 \\
60 & Shale & 40–71 & Z & 150 \\
61 & copper ore & 71–100 & E & 100 \\
62 & & 71–100 & E & 150 \\
63 & & 71–100 & Z & 100 \\
64 & & 71–100 & Z & 150 \\
65 & & 100–125 & E & 100 \\
66 & & 100–125 & E & 150 \\
67 & & 100–125 & Z & 100 \\
68 & & 100–125 & Z & 150 \\
69 & & 125–200 & E & 100 \\
70 & & 125–200 & E & 150 \\
71 & & 125–200 & Z & 100 \\
72 & & 125–200 & Z & 150 \\ \hline \end{tabular}
\end{table} 
Table 5: The variability range of parameters of the flotation test planned and carried out according to the experimental plan (E—aqueous solution of ethyl sodium xanthate; Z—aqueous solution of isobutyl sodium xanthate)—Denver machine, shale copper ore.  
On the basis of the evaluation of individual experiments, it was stated that the best results of enrichment were obtained during flotation of the sandstone copper ore type with particle size distribution of 40-71 \(\upmu\)m, where an aqueous solution of ethyl sodium xanthate in the dose of 100 g/Mg was applied to the Denver flotation machine. The results are presented in Table 7.  
In the case of enrichment of dolomite and shale copper ores in the Denver flotation machine, better results were obtained for the feed with particle size distribution of 20-40 \(\upmu\)m by means of an aqueous solution of isobutyl sodium xanthate in doses of 150 g/Mg and 100 gMg, respectively. Considering the quality of flotation concentrates, these results were much worse than in the case of the sandstone copper ore type because of the material's worse floatability. Undeniably, sandstone copper ore enrichment was highly efficient, while the efficiency of shale copper ore flotation was much worse despite its high initial copper grade in the feed (Figure 1). Having analysed the results from the Jameson cell, it was stated that the best results of enrichment were observed for the finest feed particle size distribution. That is why the information presented below was limited to the particle size fraction of 0-25 \(\upmu\)m. The beneficiati \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Fotation Products** & \(\mathbf{\gamma_{i}}\) & \(\mathbf{\Sigma\gamma_{i}}\) & \(\mathbf{\lambda_{i}}\) & \(\mathbf{\Sigma\beta_{i}}\) & \(\mathbf{\Sigma\epsilon_{i}}\) & \(\mathbf{\Sigma\eta_{i}}\) \\ \hline Product no. 1 & 3.9\% & 3.9\% & 28.26\% & 28.3\% & 0.1\% & 90.4\% & 9.6\% \\ Product no. 2 & 1.4\% & 5.3\% & 1.56\% & 21.1\% & 0.1\% & 92.3\% & 7.7\% \\ Product no. 3 & 2.7\% & 8.0\% & 0.49\% & 14.0\% & 0.1\% & 93.4\% & 6.6\% \\ Product no. 4 & 2.1\% & 10.2\% & 0.44\% & 11.2\% & 0.1\% & 94.2\% & 5.8\% \\ Product no. 5 & 1.8\% & 12.0\% & 0.43\% & 9.5\% & 0.1\% & 94.8\% & 5.2\% \\ Product no. 6 & 1.2\% & 13.2\% & 0.43\% & 8.7\% & 0.1\% & 95.0\% & 5.0\% \\ Product no. 7 & 22\% & 15.5\% & 0.25\% & 7.5\% & 0.1\% & 95.5\% & 4.5\% \\ Product no. 8 & 2.1\% & 17.6\% & 0.21\% & 6.6\% & 0.1\% & 96.3\% & 3.7\% \\ Product no. 9 & 2.3\% & 19.9\% & 0.22\% & 5.9\% & 0.1\% & 96.7\% & 3.3\% \\ Tailings & 80.1\% & 100.0\% & 0.05\% & 1.2\% & 0.00\% & 100.0\% & 0.0\% \\ \hline \hline \end{tabular}
\end{table} 
Table 7: A balance of flotation parameters of copper ore with particle size distribution of 40–71 \(\upmu\)m in the Denver flotation machine by means of an aqueous solution of ethyl sodium xanthate in the dose of 100 g/Mg. Figure 1: [PERSON]’s beneficiation curves for sandstone, dolomite and shale copper ore types, Denver flotation machine (E—aqueous solution of ethyl sodium xanthate; Z—aqueous solution of isobutyl sodium xanthate).