1978 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
is achieved when the dosage of the etherification agent is
10.0 g. The degree of substitution for carboxymethyl corn
starch at this dosage reaches 59.40%, while carboxymethyl
cassava starch reaches 79.08%. Overall, under various
experimental conditions, it is evident that the carboxy-
methylation effect of cassava starch is superior to that of
corn starch.
The higher the degree of substitution, the greater the
viscosity, the worse the water solubility, and the less soluble
in water. Therefore, three carboxymethyl starchs with dif-
ferent degrees of substitution were selected within a specific
range for follow-up experiments. In the preparation of the
carboxymethyl starches, three carboxymethyl corn starches
with degrees of substitution of 12.35, 35.33, and 59.40%,
abbreviated as CM-CS-1, CM-CS-2, CM-CS-3, were
selected as flocculants for the aggregation-magnetic sepa-
ration experiment. Three carboxymethyl cassava starches
with degrees of substitution of 24.96, 59.38, and 79.08%,
abbreviated as CM-TS-1, CM-TS-2, CM-TS-3, were also
selected.
Molecular Weight of Starch Reagents
GPC was employed with a series of polyethylene glycol
standards to establish standard curves for the molecular
weights of the starch reagents. The regression equations are
shown in Table 2.
Table 2 shows that the correlation coefficients of the
two obtained regression equations for the drugs are 0.95
and 0.94, indicating an excellent linear relationship. The
average molecular weights of CM-CS and CM-TS were
determined to be 1607 and 382009, respectively.
Agglomeration-Magnetic Separation Test
The prepared starch agents were screened through the
agglomeration-magnetic separation experiment on fine-
grained weakly magnetic iron minerals. After that, the selec-
tivity of the selected starch agents was studied through the
selective agglomeration-magnetic separation experiment of
specularite-quartz binary mixed ore. The experimental pro-
cess is illustrated in Figure 4. A multifunctional leaching
agitator (XJT-II) is used for slurry conditioning, and the ore
Figure 3. Degrees of substitution of starch agents
Table 2. The regression equations of the two starch reagents
Reagent Regression Equation Correlation Coefficient Average Molecular Weight
CM-CS y=19.639335–1.306946x–1+0.034026x–2–0.000324x–3 0.95 1607
CM-TS y=20.983930–1.479133x–1+0.041396x–2–0.000428x–3 0.94 382009
is achieved when the dosage of the etherification agent is
10.0 g. The degree of substitution for carboxymethyl corn
starch at this dosage reaches 59.40%, while carboxymethyl
cassava starch reaches 79.08%. Overall, under various
experimental conditions, it is evident that the carboxy-
methylation effect of cassava starch is superior to that of
corn starch.
The higher the degree of substitution, the greater the
viscosity, the worse the water solubility, and the less soluble
in water. Therefore, three carboxymethyl starchs with dif-
ferent degrees of substitution were selected within a specific
range for follow-up experiments. In the preparation of the
carboxymethyl starches, three carboxymethyl corn starches
with degrees of substitution of 12.35, 35.33, and 59.40%,
abbreviated as CM-CS-1, CM-CS-2, CM-CS-3, were
selected as flocculants for the aggregation-magnetic sepa-
ration experiment. Three carboxymethyl cassava starches
with degrees of substitution of 24.96, 59.38, and 79.08%,
abbreviated as CM-TS-1, CM-TS-2, CM-TS-3, were also
selected.
Molecular Weight of Starch Reagents
GPC was employed with a series of polyethylene glycol
standards to establish standard curves for the molecular
weights of the starch reagents. The regression equations are
shown in Table 2.
Table 2 shows that the correlation coefficients of the
two obtained regression equations for the drugs are 0.95
and 0.94, indicating an excellent linear relationship. The
average molecular weights of CM-CS and CM-TS were
determined to be 1607 and 382009, respectively.
Agglomeration-Magnetic Separation Test
The prepared starch agents were screened through the
agglomeration-magnetic separation experiment on fine-
grained weakly magnetic iron minerals. After that, the selec-
tivity of the selected starch agents was studied through the
selective agglomeration-magnetic separation experiment of
specularite-quartz binary mixed ore. The experimental pro-
cess is illustrated in Figure 4. A multifunctional leaching
agitator (XJT-II) is used for slurry conditioning, and the ore
Figure 3. Degrees of substitution of starch agents
Table 2. The regression equations of the two starch reagents
Reagent Regression Equation Correlation Coefficient Average Molecular Weight
CM-CS y=19.639335–1.306946x–1+0.034026x–2–0.000324x–3 0.95 1607
CM-TS y=20.983930–1.479133x–1+0.041396x–2–0.000428x–3 0.94 382009