Experimental study on magnetic separation-reverse flotation process of pyrite cinder

Anti-selected floating starch as an inhibitor of hematite, dodecylamine flotation collector as quartz gangue minerals, lime as a pH adjusting agent. The experiment mainly investigated the effect of sodium carbonate, starch, dodecylamine and pH value on the beneficiation index. (see picture 1)

Figure 1 Magnetic separation - reverse flotation process

First, the impact of PH value on iron recovery rate

The pre-screened pyrite cinder is screened for the product, and under other conditions, the effect of pH on the recovery rate is examined: grinding concentration is 70%, grinding time is 8 min, stirring is 5-8 min, and 2500 is passed. After magnetic separation of Oersted magnetic field strength, a two-stage reverse flotation process is carried out; the pharmaceutical system of one-stage flotation is: sodium carbonate, dodecylamine and starch are respectively 1000g/t, 40g/t, 100g/t, two segments The pharmaceutical system for flotation is: sodium carbonate, dodecylamine, and starch are 500g/t, 20g/t, and 80g/t, respectively. Figure 2 is a graph of recovery versus pH:

Figure 2 Relationship between pH and recovery

The pH value is adjusted by lime, and the recovery rate of iron is obviously increased under alkaline conditions. When the grade is 60% or more, the recovery rate can reach 71.48%. According to the above curve, the pH is determined to be 10-11.

The effect of the amount of dodecylamine on the recovery rate

The pre-screened pyrite slag is screened for the product, and under other conditions, the effect of the collector on the recovery rate is investigated: the grinding concentration is 70%, the grinding time is 8 min, the stirring is 5-8 min, and the After the magnetic separation of 2500 Oersted magnetic field, the two-stage reverse flotation process is carried out; the pharmaceutical system of one-stage flotation is: the pH value is adjusted to 10-11 with lime, and the dosage of sodium carbonate and starch is 1000g/t and 100g/t respectively. The second-stage flotation reagent system is: sodium carbonate, dodecylamine, and starch are 500g/t, 20g/t, and 80g/t, respectively. Figures 3 and 4 are graphs showing the relationship between the amount of dodecylamine and the recovery and grade:

Figure 3 is a graph showing the relationship between the amount of dodecylamine and the recovery rate.

Figure 4 is a graph of the relationship between the amount of dodecylamine and the grade.

With the increase of the amount of the dodecylamine in the collector, the recovery rate of iron is obviously reduced, but the grade is improved. When the dodecylamine is more than 40g/t, the grade of iron does not rise much, so in order to obtain the grade. The amount of dodecylamine, which is relatively good in recovery, is 40 g/t.

Third, the effect of starch dosage on recovery rate

The pre-screened pyrite slag is screened for the product, and under other conditions, the effect of the collector on the recovery rate is investigated: the grinding concentration is 70%, the grinding time is 8 min, the stirring is 5-8 min, and the After 2500 Oersted magnetic field strength magnetic separation, the two-stage reverse flotation process is carried out: the pharmaceutical system of one-stage flotation is: the pH value is adjusted to 10-11 with lime, and the dosage of sodium carbonate and dodecylamine is 1000g/t, 40g respectively. /t, the second-stage flotation drug system is: sodium carbonate, dodecylamine, starch dosage is 500g / t, 20g / t, 80g / t. Figure 5 is a graph showing the relationship between starch dosage and recovery:

Figure 5 Graph of starch dosage and recovery

It can be seen from the figure that the inhibition of iron minerals by starch is obvious. Although the amount of starch can be increased to obtain a higher recovery rate, it is also obtained under the condition of loss of grade, so the amount of starch is 120g/t. .

Fourth, the impact of sodium carbonate on the recovery rate

The pre-screened pyrite cinder was sieved to produce the product. Under other conditions, the effect of sodium carbonate on the recovery rate was investigated: grinding concentration was 70%, grinding time was 8 min, stirring was 5-8 min, and 2500 was passed. After the magnetic field selection of Oersted magnetic field, the two-stage reverse flotation process is carried out: the pharmaceutical system of one-stage flotation is: the pH value is adjusted to 10-11 with lime, and the dosage of dodecylamine and starch is 40g/t and 120g/t respectively. The second-stage flotation reagent system is: dodecylamine and starch are 20g/t and 80g/t respectively. Figure 6 is a graph showing the relationship between the amount of sodium carbonate and the recovery:

Figure 6 Graph of Na 2 CO 3 dosage and recovery

The use of sodium carbonate has a certain effect on the recovery of iron. When sodium carbonate is 1000g/t, the recovery rate is 70.98%, which is nearly 10% higher than 61.54% when no sodium carbonate is used. Therefore, in the reverse flotation process Add an appropriate amount of sodium carbonate to increase the recovery rate.

According to the above tests, a flotation reagent system can be obtained: the pH value is adjusted to 10-11 with lime, and the lime is added to the mill. The amounts of sodium carbonate, starch and dodecylamine are 1000g/t and 120g/ respectively. t, 40g/t. The pharmaceutical system for the two-stage flotation is basically added in the amount used in the test procedure, and the amount of the starch can be appropriately reduced to 50 to 60 g/t. The iron concentrate product obtained under this condition has a Fe grade of 62.43%, a recovery rate of 71.86%, a sulfur content of 03%, and a slightly higher sulfur content. The iron concentrate product obtained by the combined process of spiral chute-magnetic separation is slightly worse in terms of recovery rate and sulfur content, but overall it is better, and it is acceptable as ironmaking raw material.

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