1980 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
effect on specularite. In Figure 5b, it can be observed that
when the dosage of CM-TS-1 is 36 mg/L, the magnetic
separation yield is 91.26% when the dosage of CM-TS-2
is 24 mg/L, the magnetic separation yield is 89.68%, and
when the dosage of CM-TS-3 is 28 mg/L, the magnetic
separation yield is 90.67%. Overall, CM-TS-1 exhibits the
best ore-selective effect.
For carboxymethyl corn starch (low molecular weight)
agents, to achieve the optimal magnetic separation effect,
the substitution degree of the agent can be increased within
a specific range, or the agent dosage can be increased.
However, if the substitution degree of the agent itself is too
low, even increasing the agent dosage may not achieve the
same magnetic separation effect. In the case of carboxy-
methyl cassava starch (high molecular weight) agents, an
increase in substitution degree is detrimental to the mag-
netic separation effect. At a substitution degree of 60%,
the aggregation effect of the low molecular weight agent is
superior to that of the high molecular weight agent.
Effect of Reagents on Selective Agglomeration-
Magnetic Separation of Specularite-Quartz Binary
Mixed Ore
The high-intensity magnetic separation test of binary
mixed ore was carried out under a slurry pH value of 9
and a stirring speed of 500 r/min. The experimental results
are shown in Figs. 6a-b. As shown in Figure 6a, when the
dosage of CM-CS-3 is 32 mg/L, the beneficiation effect of
binary mixed ore is the best. At this time, the recovery of
iron concentrate is 79.07%, the iron grade of iron concen-
trate is 47.56%, and the beneficiation efficiency is 43.62%.
Compared with no reagent, the recovery of iron is increased
by 16.9%, the iron grade is increased by 3.78%, and the
beneficiation efficiency is increased by 17.07%. As shown
in Figure 6b, when the dosage of CM-TS-1 is 40 mg/L, the
beneficiation effect of binary mixed ore is the best, and the
recovery of iron concentrate is 86.07%, the grade of iron
concentrate is 50.12%, and the beneficiation efficiency is
49.97%. Compared with no reagent, the recovery of iron
increased by 23.9%, the iron grade increased by 6.34%,
and the beneficiation efficiency increased by 23.47%,
which showed that the selectivity of CM-TS-1 was better
than that of CM-CS-3.
Mechanism of Interaction Between Minerals and
Reagents
Microscopic Observation
The microstructures of specularite and quartz untreated
aggregation and interaction with CM-CS-3 and CM-TS-1
were observed using a polarizing microscope. The results
are shown in Figure 7.
Without adding agents, ultrafine particles in specu-
larite exhibited spontaneous agglomeration (Figure 7a).
This phenomenon is attributed to the large specific surface
area and surface energy of fine-grained specularite, lead-
ing to spontaneous agglomeration between mineral par-
ticles. After adding CM-CS-3 (Figure 7c) and CM-TS-1
(Figure 7e), specularite underwent significant agglomera-
tion. Agglomerates formed by CM-CS-3 had larger particle
sizes mixed with quartz particles, explaining the lower iron
grade in the beneficiation index. After the interaction with
the two agents, the microstructure of quartz (Figures 7d
and 7f) remained consistent with untreated agglomerated
Figure 5. Agglomeration-magnetic separation efficiency of CM-CS (a) and CM-TS (b)
effect on specularite. In Figure 5b, it can be observed that
when the dosage of CM-TS-1 is 36 mg/L, the magnetic
separation yield is 91.26% when the dosage of CM-TS-2
is 24 mg/L, the magnetic separation yield is 89.68%, and
when the dosage of CM-TS-3 is 28 mg/L, the magnetic
separation yield is 90.67%. Overall, CM-TS-1 exhibits the
best ore-selective effect.
For carboxymethyl corn starch (low molecular weight)
agents, to achieve the optimal magnetic separation effect,
the substitution degree of the agent can be increased within
a specific range, or the agent dosage can be increased.
However, if the substitution degree of the agent itself is too
low, even increasing the agent dosage may not achieve the
same magnetic separation effect. In the case of carboxy-
methyl cassava starch (high molecular weight) agents, an
increase in substitution degree is detrimental to the mag-
netic separation effect. At a substitution degree of 60%,
the aggregation effect of the low molecular weight agent is
superior to that of the high molecular weight agent.
Effect of Reagents on Selective Agglomeration-
Magnetic Separation of Specularite-Quartz Binary
Mixed Ore
The high-intensity magnetic separation test of binary
mixed ore was carried out under a slurry pH value of 9
and a stirring speed of 500 r/min. The experimental results
are shown in Figs. 6a-b. As shown in Figure 6a, when the
dosage of CM-CS-3 is 32 mg/L, the beneficiation effect of
binary mixed ore is the best. At this time, the recovery of
iron concentrate is 79.07%, the iron grade of iron concen-
trate is 47.56%, and the beneficiation efficiency is 43.62%.
Compared with no reagent, the recovery of iron is increased
by 16.9%, the iron grade is increased by 3.78%, and the
beneficiation efficiency is increased by 17.07%. As shown
in Figure 6b, when the dosage of CM-TS-1 is 40 mg/L, the
beneficiation effect of binary mixed ore is the best, and the
recovery of iron concentrate is 86.07%, the grade of iron
concentrate is 50.12%, and the beneficiation efficiency is
49.97%. Compared with no reagent, the recovery of iron
increased by 23.9%, the iron grade increased by 6.34%,
and the beneficiation efficiency increased by 23.47%,
which showed that the selectivity of CM-TS-1 was better
than that of CM-CS-3.
Mechanism of Interaction Between Minerals and
Reagents
Microscopic Observation
The microstructures of specularite and quartz untreated
aggregation and interaction with CM-CS-3 and CM-TS-1
were observed using a polarizing microscope. The results
are shown in Figure 7.
Without adding agents, ultrafine particles in specu-
larite exhibited spontaneous agglomeration (Figure 7a).
This phenomenon is attributed to the large specific surface
area and surface energy of fine-grained specularite, lead-
ing to spontaneous agglomeration between mineral par-
ticles. After adding CM-CS-3 (Figure 7c) and CM-TS-1
(Figure 7e), specularite underwent significant agglomera-
tion. Agglomerates formed by CM-CS-3 had larger particle
sizes mixed with quartz particles, explaining the lower iron
grade in the beneficiation index. After the interaction with
the two agents, the microstructure of quartz (Figures 7d
and 7f) remained consistent with untreated agglomerated
Figure 5. Agglomeration-magnetic separation efficiency of CM-CS (a) and CM-TS (b)