Beneficiation process of Limonite

Beneficiation process of LimoniteComplete equipment configuration

Jaw crusher, ball mill, classifier, strong magnetic separator, flotation machine, jig, thickener, dryer, vibrating feeder, vibrating screen, belt conveyor, etc

Beneficiation process of Limonite Device image

Beneficiation process of Limonite introduce

1、 Introduction

The selection of Limonite beneficiation process, especially the high intensity magnetic separation Limonite beneficiation process, must be determined according to the mineral properties of limonite. Only coarse particle beneficiation can greatly improve the grade of the concentrate, and brown iron ore with high beneficiation recovery rate is suitable. Limonite beneficiation process flow: raw ore crushing ball mill screening drying gravity separation flotation magnetic separation flotation.

2、 Limonite beneficiation equipment

Generally speaking, Limonite beneficiation process flow is equipped with a complete set of Limonite beneficiation equipment, mainly including jaw crusher, ball mill, classifier, high intensity magnetic separator, flotation machine, thickener, dryer, vibrating feeder, vibrating screen, belt conveyor and other equipment.

3、 Common processes

Common Limonite beneficiation processes include:

1. Single selection

2. Single flotation

3. Single magnetic separation

4. Joint process

The beneficiation technology of Limonite mainly includes single beneficiation process and combined beneficiation process. The beneficiation technology of single Limonite mainly includes gravity separation, magnetic separation, flotation (positive and negative flotation), etc.

1. Limonite is beneficiated by gravity.

Gravity separation is the main beneficiation method of Limonite production line process, that is, gravity separation is used, and in most cases, it is used for the treatment of coarse embedded ore. In most Limonite production lines, in order to further improve the quality grade, Limonite ore dressing equipment such as ore washer, trough washer and scrubber are usually used for separation, and heavy media and jigs and other gravity Limonite ore dressing equipment are used for separation. The Limonite beneficiation method is simple in equipment, low in cost, and low in power consumption. Its disadvantages are low recovery rate, high tailing grade, which is not conducive to comprehensive recovery. It is a method of Limonite beneficiation production line.

2. Limonite mineral processing method magnetic separation.

Because Limonite contains iron, they are all magnetic, and the difference of iron content in Limonite also leads to its magnetic difference, so that we can carry out magnetic separation and beneficiation of Limonite production line according to the difference of magnetism. Generally, strong magnetic separation is used to separate Limonite, but the difference of this kind of limonite Limonite beneficiation method for fine particles (-20um iron mineral) also leads to the difference of its magnetic separation effect.

3. Limonite mineral processing method flotation.

The effect of recovering fine iron minerals by flotation alone is better, but Limonite is easy to be slimed, which seriously affects the flotation effect. Therefore, desliming or enhanced dispersion of slime should be considered before flotation. Due to the fine particle size, the slime is not easy to attach to the bubble surface, forming an independent mineralized foam layer, and easy to adhere to the coarse particle surface. The selectivity and floatability of coarse-grained Limonite are obviously decreased after gangue mud is attached to its surface; The mud ratio and surface energy (activity) are high. Firstly, it adsorbs (consumes) a large amount of flotation reagents, resulting in more oil and water in the slurry, high viscosity, and a significant decrease in the selectivity and floatability of the slurry.

The flotation of Limonite beneficiation process flow can adopt positive and reverse flotation methods. Research and practice show that reverse flotation is more suitable for Limonite quality improvement and impurity reduction. In addition, due to the loose grain size and large specific surface area of Limonite particles, it is easy to absorb and consume a large amount of reagents in the flotation process. Therefore, the multi-stage dosing and multi-stage separation flotation process should be adopted for the flotation of this Limonite beneficiation method. At the same time, the closed flotation process formed by the return of middlings will reduce the beneficiation index, and the centralized return of middlings will have less impact on the beneficiation index than the sequential return of middlings.

4. Limonite beneficiation technology gravity separation high magnetic separation method.

Generally, Limonite beneficiation technology can use gravity concentration and strong magnetic separation to obtain better separation effect, that is, Limonite is washed, screened, classified and deslimed after grinding with fine particles or rod mill, coarse particles use gravity concentration concentrate, medium particles use roller magnetic separator to separate concentrate, and medium particles use roller magnetic separator to separate concentrate. To improve the iron metal recovery rate, it is possible to consider regrinding and gravity separation to significantly increase the iron grade of the concentrate. At the same time, due to the recovery of fine particle size and iron minerals in the ore slurry, a higher recovery rate can be achieved.

5. Flocculation flotation of Limonite beneficiation technology

When the grinding fineness reaches a certain value, the slurry can be fully dispersed by adding sodium carbonate and sodium silicate. The flocculation process can selectively flocculate Limonite. However, sometimes a single flocculation method can not remove a large number of coarse gangue minerals, so the flotation method can be used on the basis of selective flocculation to obtain better separation indicators.

6. Limonite beneficiation technology Flocculation high intensity magnetic separation method

For low-grade and fine-grained Limonite, only by fine grinding can a high-grade iron concentrate be obtained. At the same time, sliming will also occur, resulting in low recovery rate. At this time, flocculation strong magnetic separation method can be used as the beneficiation method for low-grade and fine-grained Limonite.

The practical application shows that under the condition of similar grade of iron concentrate, the optimal beneficiation method of flocculation and high intensity magnetic separation magnetic separation combined with Limonite is 10.97% -15.73% higher than that of direct magnetic separation, and the selection effect is better. The fine-grained iron minerals that were originally lost in high intensity magnetic separation operations were recovered due to selective agglomeration, resulting in an increase in apparent size and magnetic force. Therefore, fine Limonite can adopt the best beneficiation method of flocculation high intensity magnetic separation combined with Limonite, but the process of slurry dispersion and selective flocculation as well as the selection conditions of high intensity magnetic separator (mainly ore feeding mode, flushing water volume, etc.) should be correctly grasped.

Beneficiation process of Limonite