A shearing type mineralization device and a method for shearing type mineralization of coal slurry

Abstract

The present invention discloses a shearing type mineralization device, which comprises the following components: a pump (1), a dispersion component (2), a storage component (3), which comprises a storage chamber (31), a second mounting plate (32) and a storage chamber outlet (33); the second mounting plate (32) is provided with a recessed dispersion component accommodating area (323) and a non-recessed annular platform (321), the latter having a plurality of curved shear baffles (322) and a material throwing trough (324), the material throwing trough (324) being fluidly connected to the storage chamber (31) through a material flow hole (325) downstream; and a feed port (6). The device of the present invention can not only fully mix the coal slurry and the mineralizing agent, but also can shear the air in the device into micron-sized bubbles, thereby increasing the combination rate of carbon-hydrogen-containing combustible particles and bubbles, the phase interface obtained after the mineralized material of the present invention is statically layered, and the separation effect of carbon-hydrogen-containing combustible particles, mineral particles and water is good.

Description

Technical Field

[0001] The invention belongs to the field of coal mineralization, and in particular relates to a shearing type mineralization device and a method for performing shearing type mineralization on coal slurry. Background Art

[0002] my country is a major coal producer and consumer. Clean utilization of coal is an important research topic to ensure the green and sustainable development of my country's energy and national energy security. Coal is a mixture of carbonaceous organic rock and inorganic minerals (ash). The minerals in coal not only do not generate heat during the combustion process, but will take away part of the heat generated by the combustion of coal. Data show that for every 1% decrease in ash content in coal, the amount of standard coal consumed by thermal power plants for each kilowatt-hour of electricity generated will decrease by 3-4g, and carbon dioxide emissions can be reduced by 15-37 million tons per year. Therefore, in order to improve the comprehensive utilization efficiency of coal and reduce pollutant emissions from coal utilization, the minerals in coal should be removed as much as possible before using the coal.

[0003] However, due to the rapid development and widespread use of large-scale mechanized coal mining technology, coal ore will be refined during the mining process, accompanied by more fine-grained clay minerals. Mechanical coal mining equipment cannot effectively distinguish between coal seams and gangue layers during operation, resulting in a large number of fine clay particles and fine coal particles in the mined ore. Although there is no consensus on the definition of fine coal particles and fine-fine coal particles, it is generally believed that coal particles with a particle size of less than 6mm are defined as fine coal, and coal particles with a particle size of less than 250μm are defined as fine coal particles. These fine particles are usually not effectively separated in traditional washing and separation processes such as jigging and gravity cyclone due to their low mass, high surface energy, and large influence of fluid drag.

[0004] People's understanding of the surface properties of fine particles continues to deepen. The emergence of many separation methods and the optimization of separation equipment processes have promoted the industrial application of fine mineral particle separation. Since coal is a complex mixture containing organic hydrocarbons and inorganic minerals. The organic components in coal are complex, and are a mixture of hydrocarbons with aromatic rings as the skeleton. Its surface composed of non-polar bonds has strong hydrophobicity, so it is easy to combine with bubbles, and the process of combining with bubbles is called mineralization process; while the minerals in coal are mainly clay minerals and quartz, which have strong hydrophilicity, and the probability of adhesion to bubbles is low, and they do not move upward with the bubbles. Therefore, the difference in hydrophobicity between the two can be used to separate the two.

[0005] However, the current problem in separating carbon-hydrogen combustible particles and mineral particles in coal in a separation tower is that the process of foam sorting of fine particles requires a highly turbulent environment to allow the mineral particles to combine with the bubbles. Although the mineralized slurry has combined the target mineral particles with the bubbles to form flocs, entrainment is severe and a relatively static environment is required to strengthen the separation of hydrophobic components and hydrophilic particles. Otherwise, back mixing will occur, resulting in increased entrainment of the concentrate. In order to avoid this problem, the prior art mixes the coal slurry, reagents and air in a stirrer before separation for mineralization. The problems are: 1. The stirring time is not easy to control. A short stirring time will cause uneven stirring and low mineralization, while a long stirring time will cause the already mineralized hydrocarbon particles to be damaged; 2. The hydrophobic carbon-hydrogen-containing combustible particles in the coal have a low binding rate with the bubbles and are not firmly bound, which ultimately results in the carbon-hydrogen-containing combustible particles and mineral particles being unable to be separated from the water in the coal slurry after static separation, and the interface between the carbon-hydrogen-containing combustible particles and the mineral particles is chaotic, the mineral particles carry carbon-hydrogen-containing combustible particles, and the carbon-hydrogen-containing combustible particles are mixed with a large number of mineral particles, resulting in poor separation effect.

[0006] Therefore, it is necessary to separate the mineralized units of the coal slurry, mineralize the coal slurry before separation, and develop a mineralization device suitable for the field of coal separation. Summary of the invention

[0007] The first aspect of the present invention provides a shearing type mineralization device, which comprises the following components:

[0008] The pump 1 comprises a motor 11, a main shaft 12 driven by the motor, and a first mounting plate 13, wherein the main shaft 12 extends out of the first mounting plate 13 for a certain distance;

[0009] The dispersion component 2 includes two discs 21 and a plurality of dispersion sheets 22 located between the two discs 21, wherein the upper and lower edges of the dispersion sheets are fixedly connected to the two discs respectively, wherein one disc 21 has a spindle insertion hole 23, and the other disc 21 has a material suction port 24, and one end of the dispersion sheet 22 extends toward the inner edge of the material suction port 24, and the other end extends toward the outer edge of the disc 21, and a fluid duct 25 is formed between adjacent dispersion sheets;

[0010] The storage component 3 comprises a storage chamber 31, a second mounting plate 32 and a storage chamber outlet 33; the second mounting plate 32 has a recessed dispersed component accommodating area 323 and a non-recessed annular platform 321, the latter having a plurality of circumferentially distributed curved shear baffles 322, one end of each curved shear baffle 322 being arranged at the inner edge of the non-recessed annular platform 321, and the other end being away from the inner edge, and a gradually expanding material ejection slot 324 being formed between each curved shear baffle 322 and the inner edge of the non-recessed annular platform 321, and the downstream thereof is in fluid communication with the storage chamber 31 through a material flow hole 325;

[0011] Feed inlet 6;

[0012] The connection relationship of the above components is as follows:

[0013] The dispersing component 2 is arranged in the dispersing component accommodating area 323, and the protruding part of the main shaft 12 is inserted into the main shaft insertion hole 23 to drive the dispersing component 2 to rotate; the material suction port 24 is connected with the feed port 6 through the feed pipe 5; the fluid duct 25 is connected with the material throwing groove 324 fluid.

[0014] Preferably, the dispersion sheets 22 are arranged in a straight line or a curve.

[0015] Preferably, the pump 1 further has a first fastener 15, and the storage component 3 further has a second fastener 36, which cooperate to connect the pump 1 and the storage component 3 together and achieve sealing.

[0016] Preferably, a shear tube 4 is further provided downstream of the storage chamber outlet 33, and a through-hole plate 41 and a baffle 42 located immediately downstream thereof are provided inside the shear tube 4, the through-hole plate 41 is fluidically connected to the storage chamber outlet 33 via its central through hole 411, the baffle 42 and the through-hole plate 41 each have a serrated groove 43 on their respective surfaces facing each other, a first slit 45 is formed between the serrated grooves 43, a second slit 46 is formed between the outer edge of the baffle 43 and the inner wall of the shear tube 4, and the baffle 42 is fixed by a support leg 44.

[0017] Preferably, the axial width of the first slit 45 is 0.2 mm-1.5 mm, more preferably 0.5 mm-1 mm, and the radial width of the second slit 46 is 0.5 mm-1.5 mm, more preferably 1 mm-1.5 mm.

[0018] Preferably, the material discharge groove 324 is wider and deeper as it is closer to the material flow opening 325 , and the width of the material discharge groove 325 is 3 mm-7 mm, more preferably 5 mm-7 mm.

[0019] Preferably, the storage component 3 further includes a pressure measuring port 34 and a slag discharge port 35 .

[0020] Preferably, the mineralization device further comprises a base 7 connected to the first fastener 15 and the second fastener 36 .

[0021] The second aspect of the present invention provides a method for shearing mineralization of coal slurry, which uses the shearing mineralization device described in the first aspect of the present invention, and the method comprises the following steps:

[0022] (1) The motor 11 of the pump 1 is started, which drives the dispersion component 2 to rotate through the main shaft 12. At the same time or later, the mixture of coal slurry, mineralizing agent and air as material enters the material suction port 24 from the feed port 6 through the feed pipe 5. The dispersion component 2 mixes the materials and centrifugally throws them out along the fluid duct 25; then,

[0023] (2) The shear force between the edge of the dispersing component 2 and the curved shear baffle 31 (i.e., the material ejection groove 324) shears the air in the material into first-level micron-sized bubbles with a size of 100 μm-1000 μm, and shears the mineralizing agent into micron-sized agent droplets with a size of 10-100 μm. At the same time, under the action of the shear force, the fine ash cover on the surface of the carbon-hydrogen-containing combustible particles can be cleaned. The first-level micron-sized bubbles, the micron-sized agent droplets and the carbon-hydrogen-containing combustible particles continuously collide, so that part of the first-level micron-sized bubbles and the mineralizing agent adhere to the carbon-hydrogen-containing combustible particles in the coal slurry. On the other hand, the first-level micron-sized bubbles collide with the micron-sized agent droplets to form first-level micron-sized bubbles with stable surface tension. Then, the mixed material flows into the storage chamber 31 through the material flow hole 325 along the material ejection groove 324 under the action of centrifugal force. Then

[0024] (3) The mixed material in the storage chamber 31 flows out of the shearing mineralization device through the storage chamber outlet 33.

[0025] Preferably, the method further comprises the following steps: the material in the storage chamber 31 enters the shear tube 4 through the storage chamber outlet 33 via the central through hole 411, and flows out of the shearing mineralization device along the first slit 45 and the second slit 46 in sequence; when flowing through the first slit 45, the serrated groove 43 in the shear tube 4 further shears the first-level micron-sized bubbles into second-level micro-nano bubbles with a size of 100-500 μm on the one hand; and when passing through the first slit 45, due to the unique serrated shape of the serrated groove 43, strong turbulence is caused in the region of the first slit 45, thereby enhancing the collision of the second-level micron-sized bubbles, micron-sized reagent droplets and carbon-hydrogen-containing combustible particles, and forming second-level micron-sized bubbles with stable surface tension, so that a large number of the second-level micron-sized bubbles and a large number of reagent droplets adhere to the carbon-hydrogen-containing combustible particles in the coal slurry, thereby achieving a mineralization effect. The second slit 46 is mainly used to ensure the pressure in the shear tube 4. When the mineralized slurry flows out of the second slit 46, the pressure is instantly reduced, causing the micron-sized bubbles adhering to the carbon-hydrogen-containing combustible particles to expand and enlarge rapidly, reaching 300μm-1000μm, making it easier for the second-level micron-sized bubbles with stable surface tension in the material to collide with the carbon-hydrogen-containing combustible particles and form agglomerates.

[0026] Wherein, the mineralizing agent includes additives, collectors, flocculants or foaming agents, the additives are selected from aluminosilicate nanoparticles; the collectors are selected from kerosene or alkali metal alkyl dithiocarbonates; the flocculants are selected from polyacrylamide or starch; the foaming agent is selected from 2-octanol.

[0027] The material feed rate in step (1) is 0.3-1.5 m / s, and the feed flow rate is 200 L / h to 1 m 3 / h. The rotation speed of the dispersing component 2 is 200r / min to 3600r / min.

[0028] The coal slurry material after mineralization of the present invention can be directly transferred to a container for static separation. More preferably, the mineralized coal slurry can be transported to a micro-mineral separation tower for separation. Micro-mineral separation technology is a technology for separating clean solid dyes / raw materials (Clean Solid Fuel / Feedstock, CSF) and soil remediation minerals (Soil Remediation Minerals, SRM) from inferior coal, washed coal, coal slime, washed tailings, coal gangue and other solid wastes in the coal processing process through special technology. The micro-mineral separation tower can use the micro-nano separation equipment in the application number "201710502714.6" filed by the applicant on June 27, 2017, and the invention name is "A process for producing high calorific value water-coal slurry using coal or coal gangue and a coal gasification process using the process". At the same time, when this patented micro-nano separation equipment is selected as the micro-mineral separation tower of the present invention, the technical solutions for the micro-nano separation equipment in this patent are all applicable to the micro-mineral separation tower of the present invention.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The mineralization device of the present invention adopts a high-speed rotating dispersion component 2 to drive the material to rotate rapidly in a limited narrow space, so that the coal slurry, the mineralizing agent and the air are fully mixed, which can not only clean the fine ash cover on the surface of the carbon-hydrogen-containing combustible particles, but also make the air and the mineralizing agent fully adhere to the hydrophobic carbon-hydrogen-containing combustible particles, that is, the mineralization of the coal slurry material is realized.

[0031] 2. The dispersion component 2 in the mineralization device of the present invention rotates at a high speed to fully mix the mixture of coal slurry, mineralizing agent and air, and centrifugally throws the material out along the fluid duct 25, and flows into the storage chamber 31 through the material flow hole 325 along the material throwing groove 324. The shear force between the edge of the dispersion component 2 and the curved shear baffle 31 shears the air in the material into a large number of first-level micron-sized bubbles with a size of 100-1000μm, and shears the mineralizing agent into micron-sized agent droplets with a size of 10-100μm, while cleaning the fine ash on the surface of the carbon-hydrogen-containing combustible particles. The cover, the first-level micron-sized bubbles, the micron-sized reagent droplets and the carbon-hydrogen-containing combustible particles collide continuously, so that part of the first-level micron-sized bubbles and the mineralizing reagent adhere to the carbon-hydrogen-containing combustible particles in the coal slurry. On the other hand, the first-level micron-sized bubbles and the micron-sized reagent droplets collide to form the first-level micron-sized bubbles with stable surface tension. During the static stratification process, the carbon-hydrogen-containing combustible particles follow the bubbles to move upward to obtain a clean coal layer, while the mineral particles settle downward to obtain a tail coal layer, thereby realizing the separation of the carbon-hydrogen-containing combustible particles and the mineral particles in the coal slurry.

[0032] 3. In a preferred embodiment of the present invention, a shear tube 4 is further provided downstream of the storage chamber outlet 33 of the mineralization device of the present invention, and a through-hole plate 41 and a baffle plate 42 located immediately downstream thereof are provided inside the shear tube 4. The through-hole plate 41 is in fluid communication with the storage chamber outlet 33 via its central through hole 411, and the baffle plate 42 and the through-hole plate 41 each have a serrated groove 43 on their surfaces facing each other, a first slit 45 is formed between the serrated grooves 43, and a second slit 46 is formed between the outer edge of the baffle plate 42 and the inner wall of the shear tube 4. The shearing effect of the first slit 45 is to further shear the first-level micron-sized bubbles into second-level micro-nano bubbles with a size of 100-500 μm. On the other hand, when passing through the first slit 45, due to the unique sawtooth shape of the sawtooth groove 43, strong turbulence is caused in the area of ​​the first slit 45, which enhances the collision of the second-level micron-sized bubbles, micron-sized reagent droplets and carbon-hydrogen-containing combustible particles, and forms second-level micron-sized bubbles with stable surface tension, so that a large number of the second-level micron-sized bubbles and a large number of reagent droplets adhere to the carbon-hydrogen-containing combustible particles in the coal slurry to achieve a mineralization effect; and the second slit 46 is mainly used to ensure the pressure in the shear tube 4. When the mineralized slurry flows out of the second slit 46, due to the instantaneous reduction in pressure, the micron-sized bubbles adhered to the carbon-hydrogen-containing combustible particles expand and enlarge rapidly, which can reach 300 μm-1000 μm, so that the second-level micron-sized bubbles with stable surface tension in the material are more likely to collide with the carbon-hydrogen-containing combustible particles and form agglomerates, further improving the separation efficiency.

[0033] 4. In a preferred embodiment of the present invention, the shearing type mineralization device of the present invention comprises three slits in total, the first slit is the material throwing out slot 324 on the second mounting plate 32, the second slit is the first slit 45 in the shearing tube 2, and the third slit is the second slit 46 in the shearing tube 2. Each slit has a shearing effect on the mineralizing agent, air, and coal slurry. The shearing effect of the material throwing out slot 324 is to shear the air in the material into first-stage micro-particles with a size of 100 μm-1000 μm. The first-level micron-sized bubbles, the micron-sized agent droplets and the carbon-hydrogen-containing combustible particles are continuously collided, so that part of the first-level micron-sized bubbles and the mineralizing agent adhere to the carbon-hydrogen-containing combustible particles in the coal slurry. On the other hand, the first-level micron-sized bubbles and the micron-sized agent droplets collide to form the first-level micron-sized bubbles with stable surface tension. The shearing effect of the first slit 45 is to further shear the first-level micron-level bubbles into second-level micro-nano bubbles with a size of 100-500μm. On the other hand, when passing through the first slit 45, due to the unique sawtooth shape of the sawtooth groove 43, strong turbulence is caused in the area of ​​the first slit 45, which enhances the collision of the second-level micron-level bubbles, micron-level reagent droplets and carbon-hydrogen-containing combustible particles, and forms second-level micron-level bubbles with stable surface tension, so that a large number of the second-level micron-level bubbles and a large number of reagent droplets adhere to the carbon-hydrogen-containing combustible particles in the coal slurry to achieve a mineralization effect; and the second slit 46 is mainly used to ensure the pressure in the shear tube 4. When the mineralized slurry flows out of the second slit 46, due to the instantaneous reduction in pressure, the micron-level bubbles adhered to the carbon-hydrogen-containing combustible particles expand and enlarge rapidly, which can reach 300μm-1000μm, so that the second-level micron-level bubbles with stable surface tension in the material are more likely to collide with the carbon-hydrogen-containing combustible particles and form agglomerates.

[0034] 5. After the slurry is mineralized by the mineralization device of the present invention, the clean coal ash obtained by static stratification is 12%, the tail coal ash is 75.65%, and the combustible recovery rate is 70.97%. Under the same conditions, the clean coal ash obtained by static stratification of the slurry after stirring with an ordinary agitator is 22.02%, the tail coal ash is 63.62%, and the combustible recovery rate is only 46.41%. Therefore, the shearing type mineralization device of the present invention can not only fully mix the coal slurry and the mineralizing agent, but also shear the air in the mineralization device into micron-sized bubbles, thereby improving the binding rate and firmness of the hydrophobic carbon-hydrogen-containing combustible particles in the mineralized coal and the bubbles. The phase interface obtained after the coal slurry material after the mineralization of the present invention is static stratified is clear, and the separation effect of carbon-hydrogen-containing combustible particles, mineral particles and water is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The structural schematic diagram of the shearing type mineralization device of the present invention is Figure 5 Middle AA section;

[0036] Figure 2 A schematic structural diagram of a shear tube according to the present invention;

[0037] Figure 3 A schematic diagram of the structure of the dispersed components of the present invention;

[0038] Figure 4 A schematic diagram of the structure of the dispersed components of the present invention;

[0039] Figure 5 A schematic structural diagram of a second mounting plate of the present invention;

[0040] Figure 6 Effect diagram of the material after mineralization by the shearing type mineralization device of the present invention after static stratification;

[0041] Figure 7 The effect diagram of the material after mineralization by the prior art agitator after static stratification.

[0042] The names of the reference numerals in the description of the drawings are: 1-pump, 2-dispersing component, 3-storage component. 4-shear tube, 5-feeding tube, 6-feeding port, 7-base, 11-electrode, 12-spindle, 13-first mounting plate, 14-first fastener, 21-disc, 22-dispersing plate, 23-spindle insertion hole, 24-material suction port, 25-fluid duct, 31-storage chamber, 32-second mounting plate, 33-storage chamber outlet, 34-pressure measuring port, 35-slag discharge port, 36-second fastener, 41-through-hole plate, 42-baffle, 43-serrated groove, 44-leg, 45-first slit, 46-second slit, 321-non-recessed annular platform, 322-curved shear baffle, 323-dispersing component accommodating area, 324-material throwing slot, 325-material flow port, 411-central through hole. DETAILED DESCRIPTION

[0043] The present invention is further described below by way of examples, but the present invention is not limited thereto.

[0044] The shearing type mineralization device used in this embodiment includes the following components:

[0045] The pump 1 comprises a motor 11, a main shaft 12 driven by the motor, and a first mounting plate 13, wherein the main shaft 12 extends out of the first mounting plate 13 for a certain distance;

[0046] The dispersion component 2 includes two discs 21 and a plurality of dispersion sheets 22 located between the two discs 21, wherein the upper and lower edges of the dispersion sheets are fixedly connected to the two discs respectively, wherein one disc 21 has a spindle insertion hole 23, and the other disc 21 has a material suction port 24, and one end of the dispersion sheet 22 extends toward the inner edge of the material suction port 24, and the other end extends toward the outer edge of the disc 21, and a fluid duct 25 is formed between adjacent dispersion sheets;

[0047] The storage component 3 comprises a storage chamber 31, a second mounting plate 32 and a storage chamber outlet 33; the second mounting plate 32 has a recessed dispersed component accommodating area 323 and a non-recessed annular platform 321, the latter having a plurality of circumferentially distributed curved shear baffles 322, one end of each curved shear baffle 322 being arranged at the inner edge of the non-recessed annular platform 321, and the other end being away from the inner edge, and a gradually expanding material ejection slot 324 being formed between each curved shear baffle 322 and the inner edge of the non-recessed annular platform 321, and the downstream thereof is in fluid communication with the storage chamber 31 through a material flow hole 325;

[0048] Feed inlet 6;

[0049] The connection relationship of the above components is as follows:

[0050] The dispersing component 2 is arranged in the dispersing component accommodating area 323, and the protruding part of the main shaft 12 is inserted into the main shaft insertion hole 23 to drive the dispersing component 2 to rotate; the material suction port 24 is connected with the feed port 6 through the feed pipe 5; the fluid duct 25 is connected with the material throwing groove 324 fluid.

[0051] The dispersion sheets 22 are arranged in a curved line.

[0052] The pump 1 also has a first fastener 15, and the storage component 3 also has a second fastener 36, which cooperate to connect the pump 1 and the storage component 3 together and achieve sealing.

[0053] A shear tube 4 is also provided downstream of the storage chamber outlet 33, and a through-hole plate 41 and a baffle 42 located immediately downstream thereof are provided inside the shear tube 4. The through-hole plate 41 is fluidically connected to the storage chamber outlet 33 via its central through hole 411, and the baffle 42 and the through-hole plate 41 each have a serrated groove 43 on their opposing surfaces, a first slit 45 is formed between the serrated grooves 43, a second slit 46 is formed between the outer edge of the baffle 43 and the inner wall of the shear tube 4, and the baffle 42 is fixed by a support leg 44.

[0054] The axial width of the first slit 45 is 0.7 mm, and the radial width of the second slit 46 is 1.2 mm.

[0055] The material throwing groove 324 is wider and deeper as it is closer to the material flow opening 325 , and the width of the material throwing groove 325 is from 5 mm to 7 mm.

[0056] The storage component 3 further includes a pressure measuring port 34 and a slag discharge port 35 .

[0057] The mineralization device further comprises a base 7 connected to the first fastener 15 and the second fastener 36 .

[0058] The coal sample used in this experiment is Jinda coal slime with a particle size of P80=200 mesh. Kerosene is used as a collector and octanol as a foaming agent. The amount of kerosene used as collector is 1‰, and the amount of octanol used as foaming agent is 0.5‰. Kerosene and octanol are prepared into a mixed mineralizing agent in a mass ratio of 2:1.

[0059] In this experiment, an appropriate amount of Jinda coal slime was taken, and a certain proportion of tap water was added to prepare a coal slurry with a solid content of about 10%. The coal slurry was placed in a coal slurry storage tank, and the storage tank stirring device was turned on to stir the coal slurry evenly to prevent sedimentation. The coal slurry mainly contains combustible particles containing carbon and hydrogen (called clean coal after separation), water, and mineral particles (or ash, which is called tail coal after separation).

[0060] After the coal slurry is evenly mixed, a peristaltic pump is used to transport the coal slurry to the coal slurry storage tank. At the same time, the reagent pump and the air pump are turned on to transport the mineralizing agent and air in proportion. The ratio of coal slurry, mineralizing agent and air is 1:0.003:0.4.

[0061] The motor 11 of the pump 1 is started, and the motor 11 drives the dispersion component 2 to rotate through the main shaft 12. The rotation speed of the dispersion component 2 is controlled to be 1800r / min, so that the coal slurry in the coal slurry storage tank is sucked into the fluid duct 25 of the dispersion component 2 through the material suction port 24. The flow rate of the material sucked into the material suction port 24 is 500L / h. The rotation of the dispersion component 2 causes the dispersion sheet 22 to drive the coal slurry, the mineralizing agent, and the air to be fully mixed in the fluid duct 25 and centrifugally thrown out along the fluid duct 25 to the material throwing out groove 324; the shear force between the edge of the dispersion component 2 and the curved shear baffle 31 shears the air in the material into the first-stage micron-level bubbles. The first-stage micron-level bubbles and the mineralizing agent adhere to the carbon-hydrogen-containing combustible particles in the coal slurry; at this time, the size of the first-stage micron-level bubbles is about 100μm-1000μm, and then the material flows into the storage chamber 31 through the material flow hole 325 along the material throwing out groove 324 under the action of centrifugal force;

[0062] The material in the storage chamber 31 enters the shear tube 4 through the storage chamber outlet 33 via the central through hole 411, and flows out of the shearing mineralization device along the first slit 45 and the second slit 46 in sequence, wherein the diameter of the central through hole 411 is 5 mm, the axial width of the first slit 45 is 0.7 mm, and the radial width of the second slit 46 is 1.2 mm. When flowing through the first slit 45, the zigzag groove 43 in the shear tube 4 further shears the first-level micron-sized bubbles into second-level micro-nano bubbles, and the second-level micron-sized bubbles and the mineralizing agent adhere to the carbon-hydrogen-containing combustible particles in the coal slurry, wherein the size of the second-level micron-sized bubbles is 100μm-500μm.

[0063] The shearing mineralization device is connected downstream to a 1L static measuring cylinder, and the sheared mineralized material enters the measuring cylinder. After standing for 15 minutes, it can be observed that the material in the measuring cylinder has been clearly stratified and the phase interface is clearly visible (see Figure 6 ). The top layer is the clean coal layer formed by clean coal flocs, the middle layer is the clear water layer, and the bottom layer is the tail coal mineral precipitation layer.

[0064] After the sample was dehydrated and dried, the ash content was tested using an industrial analyzer and the combustible recovery rate was calculated. The results are shown in Table 1.

[0065] Among them, the calculation formula of ash balance combustible recovery rate is as follows:

[0066]

[0067] Where E α ——ash balance combustible recovery rate (%);

[0068] A j ——Ash content of clean coal on dry basis (%);

[0069] A y ——ash content of raw coal on dry basis (%);

[0070] A w ——Dry basis ash content of tailings coal (%).

[0071] Table 1 Results of static stratification experiment after mineralization

[0072]

[0073] For comparison, in this test, the coal slurry raw materials, mineralizing agents and air under the same conditions were introduced into the agitator and stirred for 15 minutes at a stirring speed of 1000r / min. After stirring, they were also introduced into a 1L static measuring cylinder for static stratification. After standing for 15 minutes, the results are shown in Table 1. Figure 7It can be seen that a separation interface appears between the clean coal and the tail coal, but no clear water separation layer appears as in the static experiment after mineralization, and a large amount of ash is entrained in the clean coal at the phase interface, while the tail coal at the phase interface contains a large amount of unseparated carbon-hydrogen-containing combustible particles. In other words, the method of simply standing still after high-speed stirring cannot achieve the purpose of separating the clean coal (carbon-hydrogen-containing combustible particles), water, and tail coal (ash) in the coal slurry.

[0074] After the sample was further dehydrated and dried, the ash content was tested using an industrial analyzer and the combustible recovery rate was calculated. The results are shown in Table 2.

[0075] Table 1 Results of static stratification experiment after stirring

[0076]

[0077] Comparison of the two shows that the clean coal ash content obtained by static stratification of the slurry after mineralization is 12.15%, the tail coal ash content is 75.65%, and the combustible recovery rate is 70.97%, while the clean coal ash content obtained by static stratification of the slurry after stirring is 22.02%, the tail coal ash content is only 63.22%, and the combustible recovery rate is only 46.41%. Therefore, compared with the simple stirring mineralization, the shearing type mineralization device of the present invention can not only fully mix the coal slurry and the mineralizing agent, but also shear the air in the mineralization device into micron-sized bubbles, thereby improving the binding rate of the hydrophobic carbon-hydrogen-containing combustible particles in the mineralized coal and the bubbles, as well as the binding firmness. The phase interface obtained after static stratification of the coal slurry material after mineralization of the present invention is clear, and the separation effect of the carbon-hydrogen-containing combustible particles and the mineral particles is good.

Claims

1. A shearing type mineralization device, characterized in that: It includes the following components: A pump (1) comprising a motor (11), a main shaft (12) driven by the motor, and a first mounting plate (13), wherein the main shaft (12) extends a certain distance beyond the first mounting plate (13); A dispersion component (2), comprising two discs (21) and a plurality of dispersion sheets (22) located between the two discs (21), wherein the upper and lower edges of the dispersion sheets (22) are respectively fixedly connected to the two discs (21), wherein one disc (21) has a spindle insertion hole (23), and the other disc (21) has a material suction port (24), one end of the dispersion sheet (22) extends toward the inner edge of the material suction port (24), and the other end extends toward the outer edge of the disc (21), and a fluid duct (25) is formed between adjacent dispersion sheets; A storage component (3), comprising a material storage chamber (31), a second mounting plate (32) and a material storage chamber outlet (33); the second mounting plate (32) is provided with a recessed dispersed component accommodating area (323) and a non-recessed annular platform (321), the latter having a plurality of circumferentially distributed curved shear baffles (322), one end of each curved shear baffle (322) being arranged at the inner edge of the non-recessed annular platform (321), and the other end being away from the inner edge, and a gradually expanding material ejection groove (324) being formed between each curved shear baffle (322) and the inner edge of the non-recessed annular platform (321), the downstream of which is fluidically connected to the material storage chamber (31) through a material flow hole (325); Feed inlet (6); The connection relationship of the above components is as follows: The dispersing component (2) is arranged in the dispersing component accommodating area (323), and the protruding part of the main shaft (12) is inserted into the main shaft insertion hole (23) to drive the dispersing component (2) to rotate; the material suction port (24) is connected to the feed port (6) through the feed pipe (5); and the fluid duct (25) is connected to the material ejection trough (324) fluid.

2. The shearing type mineralization device according to claim 1, characterized in that: The dispersible sheets (22) are arranged in a straight line or a curve.

3. The shearing type mineralization device according to claim 1, characterized in that: The pump (1) also has a first fastener (15), and the storage component (3) also has a second fastener (36), which cooperate to connect the pump (1) and the storage component (3) together and achieve sealing.

4. The shearing type mineralization device according to claim 1, characterized in that: A shear tube (4) is also provided downstream of the storage chamber outlet (33), and a through-hole plate (41) and a baffle plate (42) located immediately downstream thereof are provided inside the shear tube (4), and the through-hole plate (41) is fluidically connected to the storage chamber outlet (33) via its central through hole (411), and the baffle plate (42) and the through-hole plate (41) each have a serrated groove (43) on their mutually opposing surfaces, a first slit (45) is formed between the serrated grooves (43), and a second slit (46) is formed between the outer edge of the baffle plate (43) and the inner wall of the shear tube (4), and the baffle plate (42) is fixed by a support leg (44).

5. The shearing type mineralization device according to claim 4, characterized in that: The axial width of the first slit (45) is 0.2 mm to 1.5 mm, and the radial width of the second slit (46) is 0.5 mm to 1.5 mm.

6. The shearing type mineralization device according to claim 1, characterized in that: The material discharge groove (324) is wider and deeper as it is closer to the material flow opening (325), and the width of the material discharge groove (325) is 3 mm to 7 mm.

7. The shearing type mineralization device according to claim 1, characterized in that: The storage component (3) also includes a pressure measuring port (34) and a slag discharge port (35).

8. A method for shearing mineralization of coal slurry, characterized in that: The shearing mineralization device according to claim 1 is used, and the method comprises the following steps: (1) The motor (11) of the pump (1) is started, which drives the dispersion component (2) to rotate through the main shaft (12). At the same time or later, a mixture of coal slurry, mineralizing agent and air as a material enters the material suction port (24) from the feed port (6) through the feed pipe (5), and the dispersion component (2) mixes the materials and centrifugally throws them out along the fluid duct (25); then, (2) The shear force between the edge of the dispersing component (2) and the curved shear baffle (31) shears the air in the material into first-level micron-sized bubbles and shears the mineralizing agent into micron-sized agent droplets. The first-level micron-sized bubbles, the micron-sized agent droplets and the carbon-hydrogen-containing combustible particles continuously collide, so that part of the first-level micron-sized bubbles and part of the micron-sized agent droplets adhere to the carbon-hydrogen-containing combustible particles in the coal slurry; then, under the action of centrifugal force, the material flows into the storage chamber (31) along the material ejection groove (324) through the material flow hole (325); then (3) The mixed material in the storage chamber (31) flows out of the shearing mineralization device through the storage chamber outlet (33).

9. A method for shearing mineralization of coal slurry, characterized in that: Using the device described in claim 4, the method comprises the following steps: (1) The motor (11) of the pump (1) is started, which drives the dispersion component (2) to rotate through the main shaft (12). At the same time or later, a mixture of coal slurry, mineralizing agent and air as a material enters the material suction port (24) from the feed port (6) through the feed pipe (5), and the dispersion component (2) mixes the materials and centrifugally throws them out along the fluid duct (25); then, (2) The shear force between the edge of the dispersing component (2) and the curved shear baffle (31) shears the air in the material into first-level micron-sized bubbles and shears the mineralizing agent into micron-sized agent droplets. The first-level micron-sized bubbles, the micron-sized agent droplets and the carbon-hydrogen-containing combustible particles continuously collide, so that part of the first-level micron-sized bubbles and part of the micron-sized agent droplets adhere to the carbon-hydrogen-containing combustible particles in the coal slurry; then, under the action of centrifugal force, the material flows into the storage chamber (31) along the material ejection groove (324) through the material flow hole (325); then (3) The material in the storage chamber (31) enters the shear tube (4) through the storage chamber outlet (33) and the central through hole (411), and flows out of the shearing type mineralization device along the first slit (45) and the second slit (46) in sequence. When flowing through the first slit (45), the zigzag groove (43) in the shear tube (4) further shears the first-level micron-sized bubbles into second-level micro-nano bubbles. The second-level micron-sized bubbles, the micron-sized reagent droplets and the carbon-hydrogen-containing combustible particles continuously collide, so that part of the second-level micron-sized bubbles and part of the reagent droplets adhere to the carbon-hydrogen-containing combustible particles in the coal slurry.

10. The method according to claim 8 or 9, characterized in that: The mineralizing agent comprises an additive, a collector, a flocculant or a foaming agent, wherein the additive is selected from aluminosilicate nanoparticles; the collector is selected from kerosene or alkali metal alkyl dithiocarbonate; the flocculant is selected from polyacrylamide or starch; and the foaming agent is selected from octanol.

Images