CN107537697A - A kind of experimental rig for probing into Coarse Coal unit flotation desorption yield - Google Patents

Abstract

The invention provides a test device for exploring the unit flotation desorption yield of coarse-grained coal, a flotation concentrate collection tank, an upper column, a lower column, and a bottom cone; the upper part of the upper column and the flotation concentrate The collection tank is connected, the lower part of the upper column is intersected with the water distribution pipe, the bottom of the upper column is connected with the top of the lower column; the upper part of the lower column is intersected with the circular slurry feeding elbow, and the The lower part is intersected with the ventilation pipe, the port of the ventilation pipe in the lower main body is connected with the air stone, the bottom of the lower column is connected with the wide mouth of the bottom cone; the narrow mouth of the bottom cone is connected with the circulating slurry discharge pipe; the circulating slurry The discharge pipe is connected with the circulating pulp inlet elbow through the circulating pulp pipe, and a circulating pump is arranged on the circulating pulp pipe. Coal particles collide with and adhere to air bubbles in the circulating fluid of the lower column, and the adhered coal particles are brought into the ascending fluid of the upper column by the air bubbles. Under the action, it enters the flotation concentrate collection tank together with the easy-to-float coal particles.

Description

A test device for exploring the unit flotation desorption yield of coarse-grained coal

technical field

The invention relates to a device for exploring the desorption yield of coal particles, in particular to a test device for exploring the desorption yield of coarse coal unit flotation.

Background technique

The flotation process can be divided into three stages: collision, adhesion and desorption. 1. The ore particles approach the air bubbles at a certain speed in the flowing pulp and collide with them; 2. As the distance between the particles and the air bubbles shrinks, the ordinary water molecules between them are gradually pushed away. Ordinary water molecules are arranged disorderly, so the process occurs easily. When the distance between the two is close to the contact of the hydration film of the two, the process of thinning the hydration film begins, the hydration film on the surface of the air bubbles and the particle starts to dehydrate, and the thickness of the hydration film of each other continues to decrease until the critical thickness . Then the hydration film on the surface of the bubbles will break rapidly, and the particles and the bubbles will come into real contact, thus forming a gas-solid-liquid three-phase wetted periphery. With the expansion of the three-phase wetted periphery, the particles will be firmly adsorbed on the bubbles; 3. Not all particles adhering to the bubbles will enter the foam layer and be scraped out, and some will fall off the surface of the bubbles and re-enter the slurry. Different from the particle-bubble collision and adhesion, the particle-bubble desorption process is more complicated, involving microscopic forces such as surface physics and chemistry. The mechanism is still unclear, and there are still many deficiencies in existing research equipment and research methods. .

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art, to break through the limitations of the interaction between a single air bubble and a coal particle group or a single coal particle and a bubble group in the laboratory, and to explore statistically through the effects of the air bubble group and coal particle group In order to improve the desorption yield, a device with simple structure and laboratory use for exploring the desorption yield of coarse coal unit flotation is provided.

In order to solve the above-mentioned technical problems, the test device provided by the present invention to explore the flotation desorption yield of coarse-grained coal unit includes a flotation concentrate collection tank, an upper column, a lower column, a bottom cone, a circulating slurry inlet elbow, Circulating pulp discharge pipe, ventilation pipe, air stone and water distribution pipe; the upper part of the upper column is connected with the flotation concentrate collection tank, the lower part of the upper column is connected with the water distribution pipe, and the water distribution pipe is provided with water distribution holes , the bottom of the upper column is connected to the top of the lower column; the upper part of the lower column is intersected with the circular slurry feeding elbow, and the lower part of the lower column is intersected with the air pipe, and the air pipe is connected to the port in the lower main body Connected with the air stone, the bottom of the lower column is connected with the wide mouth of the bottom cone; the narrow mouth of the bottom cone is connected with the circulating pulp discharge pipe; the circulating pulp discharge pipe and the circulating pulp inlet elbow pass through the circulating pulp pipe connected, and a circulating pump is provided on the circulating slurry pipe.

As an improvement, the end of the water distribution pipe is circular, which is compatible with the inner wall of the upper cylinder; the water distribution hole is located at the upper part of the end of the water distribution pipe.

As an improvement, the outlet of the circulating slurry inlet elbow is vertically downward.

Beneficial effects of the present invention: 1. The upflow formed in the upper column and the downflow formed in the lower column form a two-way fluid in the column, and coal particles in the downflow are transported into the upflow through air bubbles carrying coal particles , the coal particles enter the flotation concentrate collection tank under the action of upflow, breaking through the limitation of the interaction between a single air bubble and coal particle group or a single coal particle and air bubble group in the laboratory, so as to explore the desorption yield of unit feed; 2 、Through the water filling of the water distribution pipe, it can separate the hard-to-float coal particles in the feed of the unit, which solves the problem of batch separation of hard-to-float coal particles in the laboratory.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of water distribution pipe of the present invention;

In the figure: 1-flotation concentrate collection tank; 2-upper cylinder; 3-water distribution pipe; 4-lower cylinder; Tube; 9-circulating pump; 10-circulating slurry pipe; 11-circulating slurry feeding elbow; 12-distribution water hole.

detailed description

Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

As shown in Figure 1-2, the test device of the present invention to explore the flotation desorption yield of coarse-grained coal unit includes a flotation concentrate collection tank 1, an upper column 2, a lower column 4, a bottom cone 7, and a circulating slurry Feed elbow 11, circulating pulp discharge pipe 8, ventilation pipe 6, air stone 5 and water distribution pipe 3; the upper part of the upper column 2 is connected with the flotation concentrate collection tank 1, and the lower part of the upper column 2 is connected with the The water distribution pipe 3 intersects, and the end of the water distribution pipe 3 is circular, which is compatible with the inner wall of the upper cylinder 2. The upper part of the end of the water distribution pipe 3 is provided with a water distribution hole 12, and the bottom of the upper cylinder 2 is connected to the lower column. The top of the body 4 is connected; the upper part of the lower column 4 is intersected with the circulating slurry inlet elbow 11, the outlet of the circulating slurry inlet elbow 11 is vertically downward, and the lower part of the lower column 4 is connected with the ventilation pipe 6 Intersecting, the vent pipe 6 is connected to the air stone 5 at the lower cylinder 4 inner port, and the bottom of the lower cylinder 4 is connected to the wide mouth of the bottom cone 7. The narrow mouth of the bottom cone 7 is connected with the circulating pulp discharge pipe 10, and the circulating pulp discharge pipe 10 is connected with the circulating pulp feeding elbow 11 through the circulating pulp pipe 10, and the circulating pulp pipe 10 is provided with a circulating pump 9.

The working process of the present invention: pour a certain amount of coarse-grained coal through the top of the upper column 2 after slurry adjustment, add water to make the liquid level in the column equal to the top of the upper column 2, and then turn on the circulation pump 9, A circulating fluid is formed in the cylinder 4 and the circulating slurry pipe 10. After the circulating fluid is relatively stable, the ventilation pipe 6 is inflated, and the downward moving coal particles collide with the upward moving air bubbles from the air stone 5 and adhere to them. At this time, part of the easy-to-float coal particles are brought to the surface of the liquid by the air bubbles and scraped into the flotation concentrate collection tank 1 by scrapers; Sink into the circulating fluid in the lower column 4, and then continue to be brought by the air bubbles to the upward flow of the upper column 2, and thus reciprocate. After flotation for a certain period of time, the water distribution pipe 3 is filled with water after the flotation of coal particles that are easy to float. At this time, an upward flow is formed above the upper column 2 and above the water distribution pipe 3, so that the flow rate of the upward flow is greater than the maximum settlement final velocity of the coarse-grained coal particle group. At this time, part of the desorbed coal particles enter the flotation concentrate collection tank 1 under the action of the rising water flow, respectively collect the materials in the flotation concentrate collection tank 1 before and after the water distribution pipe 3 is filled, and then enter the water distribution pipe 3 after filling with water. The material in the flotation concentrate collection tank is the hard-to-float coal particles. After flotation for a certain period of time, close all moving parts, unplug the port of the circulating pulp pipe 10 connected to the circulating pulp discharge pipe 8, collect the flotation tailings and rinse the equipment.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, some improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the present invention. scope of protection.

Claims (3)

1. a kind of experimental rig for probing into Coarse Coal unit flotation desorption yield, including flotation concentrate collecting tank（1）, column body （2）, lower prop（4）And base cone（7）；It is characterized in that：The experimental rig also includes circulation ore pulp pan feeding bend pipe（11）, circulation ore deposit Starch discharge nozzle（8）, breather pipe（6）, Bubbled stone（5）And water distributor（3）；The column body（2）Top and flotation concentrate collect Groove（1）It is connected, column body（2）Bottom and lower prop（4）Top be connected, column body（2）Bottom and water distributor（3）Phase Pass through；The water distributor（3）Provided with water distributing pore（15）；The lower prop（4）Top with circulation ore pulp pan feeding bend pipe（11）Mutually pass through, Lower prop（4）Bottom and breather pipe（6）Mutually pass through, lower prop（4）Bottom and base cone（7）Wide-mouth be connected；The breather pipe （6）Port and Bubbled stone（5）It is connected；The base cone（7）Slot with circulation ore pulp discharge nozzle（8）It is connected；The circulation ore deposit Starch pan feeding bend pipe（11）With circulating ore pulp discharge nozzle（8）By circulating ore pulp pipe（10）It is connected, circulates ore pulp pipe（10）It is provided with Circulating pump（9）.

2. the experimental rig according to claim 1 for probing into Coarse Coal unit flotation desorption yield, it is characterised in that：It is described Water distributor（3）End for circle, with column body（2）Inwall be adapted；The water distributing pore（15）Positioned at water distributor（3）End Top.

3. the experimental rig according to claim 1 for probing into Coarse Coal unit flotation desorption yield, it is characterised in that：It is described Circulate ore pulp pan feeding bend pipe（11）Discharging opening vertically downward.