CN107303540A - A kind of column-type floatation device and method based on oil vacuole - Google Patents

Abstract

The invention discloses a column type flotation equipment and method based on oil bubbles. The equipment mainly includes an oil chamber, a sintered plate, a flange, a main inlet pipe, a branch inlet pipe, a circulating pump, a bubble generator and an overflow tank , it is characterized in that the oil chamber is arranged at the bottom of the column body of the column type flotation equipment, and the sintered plate fixed in the middle of the flange isolates the oil chamber from the pulp in the flotation section; the air inlet and the main road air inlet pipe Connected by pipelines, the main inlet pipe is arranged circularly around the body of the flotation column, and is connected with 6 branch inlet pipes; the 6 branch inlet pipes are evenly arranged around the bottom of the oil chamber, and each branch The air outlet of the air inlet pipe is probed into the oil chamber for a suitable length, so as to ensure the uniform distribution of gas in the oil chamber; the swirl flow formed by the circulation pump not only strengthens the separation of medium coal, but also ensures that the mineral particles are in the slurry. The suspension in the medium creates favorable conditions for the mineralization of coal particles and oil bubbles.

Description

A column flotation device and method based on oil bubbles

technical field

The invention relates to a column type flotation device and method, in particular to a column type flotation device and method for oil bubble flotation of low-rank coal slime.

Background technique

According to the 2016 BP World Energy Statistical Yearbook, China remained the world's largest energy consumer in 2015, accounting for 23% of global energy consumption and 34% of the net increase in energy consumption. my country is rich in coal resources, accounting for 94% of my country's energy reserves, while oil and natural gas account for only 6%. Coal, as an important support of my country's energy and an important industrial raw material, provides an important guarantee for economic and social development and energy security supply. Coal, as the main fuel of my country's primary energy consumption, accounts for 64% of primary energy consumption. Although my country's energy structure has been continuously improving, according to forecasts, the proportion of coal consumption will still reach about 47% by 2035. Low-rank coal is a coal resource with a low degree of metamorphism, including lignite, long-flame coal, non-caking coal, and weakly caking coal. In my country, low-rank coal resources are very rich and have become an important part of my country's coal energy production and supply. With the depletion of high-quality coal resources and the deterioration of resource geological conditions, coupled with the low degree of metamorphism of low-rank coal and the further improvement of the degree of mechanized mining of coal, the proportion of slime in raw coal is on average between 20% and 20%. Between 30%, the proportion of high-ash refractory fine-grained coal shows a sharp increase trend. Due to the low degree of metamorphism and high oxygen content of low-rank coal, the surface porosity is large, resulting in poor buoyancy and low recovery rate of clean coal, resulting in waste of coal resources. Flotation technology is by far the most effective separation technology for fine-grained coal slime below 0.5 mm. The flotation research results for various refractory minerals show that compared with conventional flotation, the induction time for active oil bubbles to adhere to mineral particles is shorter, showing stronger collection capacity and selectivity, which has been proved It is a more effective technical means.

Contents of the invention

Purpose of the invention: In order to solve the technical problem of low recovery rate of difficult separation of low-rank coal slime, provide a coal slime flotation equipment with simple structure, good separation effect and high recovery rate.

Technical solution: The technical solution of the present invention is: a column type flotation device based on oil bubbles, including an oil inlet valve, an oil discharge valve, an oil chamber, a sintered plate, a flange, a main inlet pipe, a branch inlet pipe, Air inlet, circulation pump, bubble generator, tailings outlet, overflow tank, concentrate discharge outlet, feed inlet, gas flow meter, air compressor, gas storage tank and steam-water separator, characterized in that the The column type flotation equipment is divided into flotation section, scavenging section and oil chamber. The oil chamber is located in the lower part of the scavenging area, the bottom of the column, and the sintered plate fixed in the middle of the flange isolates the oil chamber from the pulp in the flotation column. Open; the gas storage tank is connected to the air inlet through the gas flow meter, and the air pressure and ventilation volume to the oil chamber are adjusted through the cooperation of the valve of the gas storage tank and the gas flow meter; the air inlet and the main air intake pipe Connected by pipelines, the main inlet pipe is arranged circularly around the body of the flotation column, and is connected with 6 branch inlet pipes; the 6 branch inlet pipes are evenly arranged around the bottom of the oil chamber, and each branch The air outlet of the air inlet pipe is protruded into the oil chamber for a suitable length to ensure that the gas is evenly dispersed in the oil chamber (5) in the form of bubbles; the position of the oil inlet valve is higher than that of the oil chamber top. The sintering plate is at a certain distance, and the oil pipe connecting the oil discharge valve and the bottom of the oil chamber is at the same level; the swirling flow formed by the circulating pump in the sweeping area not only strengthens the separation of medium coal, but also ensures the separation of mineral particles in the slurry. Suspension creates favorable conditions for the mineralization of coal particles and oil bubbles.

Preferably, the column type flotation equipment based on oil bubbles is characterized in that the tailings port is located at the bottom of the scavenging area, and the pipeline connected to the inlet of the circulation pump is located at a high height in the flotation column body. A certain distance from the level of the tailings mouth; the bubble generator of the column type flotation equipment based on oil bubbles can supplement the air flow in the flotation column while sucking the foaming agent.

A kind of column type flotation method based on oil bubble of the present invention, comprises the following steps:

Mix the normal temperature liquid oily collector and surfactant according to a certain ratio, after stirring and mixing evenly, open the oil inlet valve and feed it into the oil chamber at a certain flow rate by the peristaltic pump; through the air compressor and the steam separator The pressurized dry air obtained after treatment is stored in the air storage tank; through the combined use of the valve of the air storage tank and the gas flow meter, the pressurized dry air passes through the branch inlet pipe at a certain pressure and flow in the form of bubbles. Due to the effect of the pressure in the oil chamber, the bubbles dispersed in the oil phase pass through the extremely small pores distributed inside the sintered plate to form tiny oil bubbles (tiny bubbles with a layer of oil film on the surface); The negative pressure generated when the slurry is injected, the foaming agent is sucked into the swirl section along the tangential direction through the inlet of the bubble generator; the tiny oil bubbles are further pulverized under the joint action of the high-speed jet of the slurry and the foaming agent, and dispersed into micron-sized oil bubbles; add different types and mass percentages of surfactants and other additives to the oily collector to change the surface tension of the collector, thereby regulating the thickness of the oil film coated on the bubbles; put the low-rank coal in the mixing tank Wet in the medium, mix with water evenly to form a certain concentration of slurry, which is fed into the flotation column from the feed port by the feed pump; the tiny oil bubbles in the flotation section have a certain relative to the low-rank coal particles with good floatability The speed collides and mineralizes, and floats to the overflow tank and is discharged from the concentrate discharge port to become a clean coal product; the medium ore that has not been mineralized and floated in the flotation section is driven into the sweeping area at a high speed along the tangential direction by the circulating pump, and the ore pulp is in the flotation section. Under the action of centrifugal force, the heavy product in the middle ore moves downwards along the inner wall of the flotation column in a spiral motion, and finally is discharged from the tailings port to become the tailing coal product. The formed flocs move to the center of the swirling flow, and quickly float to the flotation section to realize the secondary flotation of medium coal; on the other hand, the swirling flow caused by the circulating pump plays a role in the mineral particles in the flotation column Stirring ensures the suspension of mineral particles in the slurry and creates favorable conditions for the mineralization of low-rank coal particles and oil bubbles.

Beneficial effects: Different from conventional flotation equipment, in the flotation operation using oil bubbles as the flotation carrier, the collector is not directly added to the liquid phase, but wrapped in a thin layer of oil film in the dispersed On the surface of the air bubbles in the oil chamber, after the oil bubbles enter the slurry, the oil film and the low-rank coal particles are adsorbed, and the air bubbles are also adhered to the coal particles, which reduces the adhesion work during the mineralization process of the air bubbles and greatly shortens the induction time. Improved flotation efficiency.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a sectional view of section A-A in Fig. 1 .

In the figure: 1. Oil discharge valve, 2. Oil inlet valve, 3. Tailings port, 4. Main inlet pipe, 5. Oil chamber, 6. Branch inlet pipe, 7. Flange, 8. Sintered plate, 9. Air inlet, 10. Circulation pump, 11. Air compressor, 12. Steam-water separator, 13. Gas storage tank, 14. Gas flow meter, 15. Material inlet, 16. Bubble generator, 17. Overflow Launder, 18, ore concentrate discharge port.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

A column flotation device based on oil bubbles, including an oil inlet valve 2, an oil discharge valve 1, an oil chamber 5, a sintered plate 8, a flange 7, a main inlet pipe 4, a branch inlet pipe 6, and an air inlet 9. Circulation pump 10, bubble generator 16, tailings port 3, overflow tank 17, concentrate discharge port 18, feed port 15, gas flow meter 14, air compressor 11, gas storage tank 13 and steam-water separation The device 12 is characterized in that the oil chamber 5 is arranged in the column type flotation equipment and is divided into a flotation section, a scavenging section and an oil chamber, the oil chamber is located at the lower part of the scavenging area, and the bottom of the column is fixed in the middle of the flange 7 The sintered plate 8 isolates the oil chamber 5 from the pulp in the flotation column; the gas storage tank 13 is connected with the air inlet 9 through the gas flow meter 14, and is used in conjunction with the valve of the gas storage tank 13 and the gas flow meter 14 to adjust the air pressure and air flow to the oil inlet chamber 5; the air inlet 9 is connected to the main road air intake pipe 4 through a pipeline, and the main road air intake pipe 4 is arranged circularly around the flotation column body, and is connected with 6 The branch air intake pipes 6 are connected; the six branch air intake pipes 6 are evenly arranged around the bottom of the oil chamber 5, and the air outlet of each branch air intake pipe 6 is probed into the oil chamber 5 for a suitable length to ensure that the gas Evenly dispersed in the oil chamber 5 in the form of air bubbles; the position of the oil inlet valve 2 is higher than the sintered plate 8 on the top of the oil chamber 5 by a certain distance, and the oil discharge valve 1 is connected to the oil pipeline at the bottom of the oil chamber 5 At the same level; the swirling flow formed by the circulation pump 10 in the sweeping area not only strengthens the separation of medium coal, but also ensures the suspension of mineral particles in the slurry, creating favorable conditions for the realization of the mineralization of coal particles and oil bubbles .

When in use, the normal temperature liquid oily collector and surfactant are mixed according to a certain ratio. After stirring and mixing evenly, the oil inlet valve is opened and the peristaltic pump is fed into the oil chamber 5 at a certain flow rate; 11 and the pressurized dry air processed by the steam-water separator 12 is stored in the air storage tank 13; through the cooperation of the valve of the air storage tank 13 and the gas flow meter 14, the pressurized dry air passes through at a certain pressure and flow rate. The branch inlet pipe 6 is evenly dispersed in the oil chamber 5 in the form of air bubbles. Due to the pressure in the oil chamber 5, the air bubbles dispersed in the oil phase pass through the extremely small pores distributed inside the sintered plate 8 to form tiny Oil bubbles (tiny bubbles covered with a layer of oil film on the surface); due to the negative pressure generated when the circulating slurry is sprayed, the foaming agent is sucked into the swirl section along the tangential direction through the inlet of the bubble generator 16; Under the joint action of the jet and the foaming agent, it is further pulverized and dispersed into micron-sized oil bubbles; additives such as surfactants of different types and mass percentages are added to the oily collector to change the surface tension of the collector, thereby regulating The thickness of the oil film covered on the air bubbles; the low-rank coal is wetted in the mixing tank and mixed with water to form a certain concentration of slurry, which is fed into the flotation column from the feed port 15 by the feed pump; the tiny oil bubbles are The flotation section collides with the low-rank coal particles with good buoyancy at a certain relative speed and mineralizes, floats up to the overflow tank 17 and is discharged from the concentrate discharge port 18 to become a clean coal product; The mineralized and floating middle ore is pumped into the scavenging area at a high speed along the tangential direction by the circulating pump 10. The ore slurry swirls under the action of centrifugal force, and the heavy products in the middle ore spiral downward along the inner wall of the flotation column, and finally pass through the tailings port. 3 Discharged into tailing coal products, the flocs formed by relatively good buoyancy coal particles and oil bubbles in the middling mine move to the center of the swirling flow, and quickly float to the flotation section to realize the secondary flotation of the middling coal; On the one hand, the swirling flow caused by the circulation pump 10 has a stirring effect on the mineral particles in the flotation column, which ensures the suspension of the mineral particles in the slurry and creates a favorable environment for the mineralization of low-rank coal particles and oil bubbles. Favorable conditions.

Claims (3)

1. A column flotation device based on oil bubbles, including oil inlet valve (2), oil discharge valve (1), oil chamber (5), sintered plate (8), flange (7), main inlet Air pipe (4), branch air intake pipe (6), air inlet (9), circulation pump (10), bubble generator (16), tailings port (3), overflow tank (17), concentrate discharge Material inlet (18), material inlet (15), gas flow meter (14), air compressor (11), gas storage tank (13) and steam-water separator (12), characterized in that the oil chamber (5) The column flotation equipment is divided into flotation section, scavenging section and oil chamber. The oil chamber is located in the lower part of the scavenging area, the bottom of the column, and the sintered plate (8) fixed in the middle of the flange (7) holds the oil The chamber (5) is isolated from the pulp in the flotation column; the gas storage tank (13) is connected to the air inlet (9) through the gas flow meter (14), and the valve and the gas flow meter of the gas storage tank (13) (14) is used together to adjust the air pressure and air flow to the oil chamber (5); the air inlet (9) is connected to the main air intake pipe (4) through a pipeline, and the main air intake pipe (4) surrounds the The flotation column is arranged in a circular shape and connected with 6 branch inlet pipes (6); the 6 branch inlet pipes (6) are evenly arranged around the bottom of the oil chamber (5), and each branch inlet pipe The gas outlets of (6) are probed into the oil chamber (5) for a suitable length, so as to ensure that the gas is evenly dispersed in the oil chamber (5) in the form of bubbles; the position of the oil inlet valve (2) is at the horizontal height The top is higher than the sintered plate (8) on the top of the oil chamber (5) at a certain distance, and the oil passage connecting the oil discharge valve (1) to the bottom of the oil chamber (5) is at the same level; The swirling flow formed not only strengthens the separation of medium coal, but also ensures the suspension of mineral particles in the slurry, creating favorable conditions for the mineralization of coal particles and oil bubbles. 2. A kind of column type flotation equipment based on oil bubbles according to claim 1, characterized in that, the tailings port is located at the bottom of the sweeping area, and the pipeline connected to the inlet of the circulating pump is located in the flotation column body. The height is higher than the level of the tailings mouth by a certain distance; the bubble generator (16) of the column type flotation equipment based on oil bubbles can supplement the air flow in the flotation column while sucking the foaming agent . 3. a kind of column type flotation method based on oil bubbles of equipment according to claim 1, is characterized in that, comprises the steps: Mix the normal-temperature liquid oily collector and surfactant in a certain ratio, and after stirring and mixing evenly, open the oil inlet valve and feed it into the oil chamber (5) at a certain flow rate by the peristaltic pump; through the air compressor ( 11) The pressurized dry air obtained after treatment with the steam-water separator (12) is stored in the air storage tank (13); through the cooperation of the valve of the air storage tank (13) and the gas flow meter (14), the pressurized dry air The air is evenly dispersed in the oil chamber (5) in the form of air bubbles through the branch inlet pipe (6) at a certain pressure and flow rate. Due to the pressure in the oil chamber (5), the air bubbles dispersed in the oil phase Micro oil bubbles (tiny bubbles covered with a layer of oil film on the surface) are formed after passing through the extremely small pores distributed inside the sintered plate (8); due to the negative pressure generated when the circulating slurry is sprayed, the foaming agent passes through the bubble generator (16 ) is sucked into the swirl section along the tangential direction; the tiny oil bubbles are further pulverized under the joint action of the high-speed jet of the pulp and the foaming agent, and dispersed into micron-sized oil bubbles; adding different types and Surfactant and other additives in mass percentage to change the surface tension of the collector, so as to control the thickness of the oil film coated on the air bubbles; wet the low-rank coal in the mixing tank, mix it with water to form a certain concentration of slurry, The feed pump is fed into the flotation column from the feed port (15); the tiny oil bubbles collide with the low-rank coal particles with good buoyancy in the flotation section at a certain relative speed and mineralize, and float up to the overflow The trough (17) is discharged from the concentrate discharge port (18) to become a clean coal product; the middling ore that has not been mineralized and floated in the flotation section is pumped into the sweeping area at high speed along the tangential direction by the circulating pump (10), and the ore pulp is discharged under the action of centrifugal force. Under the swirling motion, the heavy products in the middling mine spiral downward along the inner wall of the flotation column, and are finally discharged from the tailings port (3) to become tailings products. The flocs formed by the bubbles move to the center of the swirling flow, and quickly float to the flotation section to realize the secondary flotation of medium coal; It plays a stirring role, ensures the suspension of mineral particles in the slurry, and creates favorable conditions for the mineralization of low-rank coal particles and oil bubbles.