CN115055486B - Method for recycling barium sulfate from shale gas drilling oil sludge dry slag and recycling system thereof - Google Patents
Method for recycling barium sulfate from shale gas drilling oil sludge dry slag and recycling system thereof Download PDFInfo
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- CN115055486B CN115055486B CN202210617390.1A CN202210617390A CN115055486B CN 115055486 B CN115055486 B CN 115055486B CN 202210617390 A CN202210617390 A CN 202210617390A CN 115055486 B CN115055486 B CN 115055486B
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 title claims abstract description 162
- 239000010802 sludge Substances 0.000 title claims abstract description 40
- 238000005553 drilling Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002893 slag Substances 0.000 title claims abstract description 26
- 238000004064 recycling Methods 0.000 title description 9
- 238000012216 screening Methods 0.000 claims abstract description 54
- 239000010419 fine particle Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000011435 rock Substances 0.000 claims abstract description 28
- 238000005108 dry cleaning Methods 0.000 claims abstract description 20
- 239000011362 coarse particle Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 54
- 238000000227 grinding Methods 0.000 claims description 30
- 238000007602 hot air drying Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 7
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000005188 flotation Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910052601 baryte Inorganic materials 0.000 description 2
- 239000010428 baryte Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a method for recovering barium sulfate from shale gas drilling oil sludge dry slag, which comprises the following steps: s1, carrying out hot air dry cleaning on oil sludge dry residues to obtain coarse particles and fine particles; s2, crushing the fine particles to obtain crushed fine particles; s3, screening the crushed fine particles to obtain screened materials; s4, carrying out air classification on the sieved material to obtain rock debris and barium sulfate. The invention can extract low-grade barium sulfate in dry slag of oil sludge of the rock gas drilling, the grade of the extracted barium sulfate reaches industrial grade, the grade of the obtained barium sulfate reaches more than 80 percent, the recovery rate of the barium sulfate is more than 70 percent, and the barium sulfate can be returned to a drilling platform to be used as a main component of a weighting agent, thereby realizing the cyclic utilization of the barium sulfate and relieving the exploitation requirement on the heavy-duty rock ore.
Description
Technical Field
The invention relates to the field of comprehensive utilization of solid waste resources, in particular to a method for recycling barium sulfate from shale gas drilling oil sludge dry residues and a recycling system thereof.
Background
The shale gas exploitation technology in China is mature, the exploitation amount is continuously increased, in the shale gas well drilling process, barium sulfate is used as a main component of a drilling mud weighting agent, the demand amount is continuously increased, after industrial grade barium sulfate (more than 80% in grade) is added, the industrial grade barium sulfate is mixed with rock scraps, well cementation oil and the like to form dangerous waste drilling mud, after dangerous waste harmless treatment, deoiling and dehydration, the barium sulfate is mixed with the rock scraps to form drilling mud dry slag, and the part of low grade (15-40% in grade) barium sulfate runs off along with the dry slag as solid waste; meanwhile, the requirement for barium sulfate is continuously increased, the resource and environmental burden of the exploitation of the barite ore are increased, and the barium sulfate resource is lost as a disposable consumable product.
The ore dressing method of the barite raw ore is manual sorting and crushing, and the method is not suitable for powdery oil sludge dry slag; the wet-type barium sulfate beneficiation method adopts wet-type gravity separation or flotation means according to the characteristics of sulfate radical, however, the wet-type beneficiation requires a large amount of water to be consumed as a medium, a flotation reagent to be added, a large amount of secondary pollutants such as industrial wastewater and the like are generated, and the cost is high.
In the sludge dry slag, the rock scraps are larger, the maximum size reaches millimeter level, and the particle size of barium sulfate is below 200 meshes (0.075 mm); the specific gravity of the rock scraps is between 2.2 and 2.8, and the barium sulfate is between 4.0 and 4.5; meanwhile, as barium sulfate particles are attached to the surfaces of rock fragments, the particles are converged and combined into a block mass, and a certain difficulty is brought to separation. Therefore, it is extremely important to find a technology for recovering low-grade barium sulfate from sludge dry slag.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method and a system for recycling barium sulfate from shale gas drilling oil sludge dry residue, which do not need to add water and chemical agents, do not generate any other pollutants, reduce industrial cost, and are particularly suitable for drilling mud weighting agents, so that the recycling of the resources of the barium sulfate is realized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention firstly provides a method for recovering barium sulfate from shale gas drilling oil sludge dry slag, which comprises the following steps:
s1, carrying out hot air dry cleaning on oil sludge dry residues to obtain coarse particles and fine particles;
s2, crushing the fine particles to obtain crushed fine particles;
s3, screening the crushed fine particles to obtain screened materials;
S4, carrying out air classification on the sieved material to obtain rock debris and barium sulfate.
Preferably, the coarse particles in S1 are particles larger than 40 mesh, and the fine particles are particles smaller than or equal to 40 mesh.
Preferably, the mass of the coarse particles in the S1 accounts for 25-40% of the mass of the oil sludge dry residue.
Preferably, the control pressure in the S1 hot air drying and washing process is more than 0.6 MPa.
Preferably, the fine particles after crushing in S2 have a particle size of 200 mesh or less.
Preferably, in the step S3, the crushed fine particles are subjected to multi-stage screening to obtain six grades of materials, namely-200 meshes to +325 meshes, 325 meshes to +400 meshes, 400 meshes to +500 meshes, 500 meshes to +700 meshes, 700 meshes to +900 meshes and 900 meshes.
The invention also provides a system for realizing the method for recovering the barium sulfate from the shale gas drilling oil sludge dry slag, which comprises the following steps: the device comprises a feeding device, a hot air dry cleaning device, a grinding device, a screening device and an air classification device; the feeding device is connected with the hot air dry cleaning device, the hot air dry cleaning device comprises a first discharge hole and a second discharge hole, the second discharge hole is connected with the ore grinding device, the discharge hole of the ore grinding device is connected with the screening device, and the screening device is connected with the air classification device.
Preferably, the coarse particles are discharged from the first discharge port, and the fine particles are discharged from the second discharge port.
More preferably, the coarse particles are particles larger than 40 mesh, and the fine particles are particles smaller than or equal to 40 mesh.
Preferably, the grinding granularity of the grinding device is 200 meshes.
Preferably, the ore grinding device comprises dry ore grinding equipment such as an airflow ore grinding machine, a disc mill, a steam kinetic energy ore grinding machine and the like, but a wet ore grinding machine such as a ball mill and the like cannot be adopted.
Preferably, the screening apparatus includes a dry screening apparatus such as a vibratory screening machine, an ultrasonic screening machine, a linear screen, etc., but a wet screening apparatus such as a cyclone may not be used.
Preferably, two screening devices are connected in series in the screening device.
Preferably, the screening device is provided with a multi-stage screen, including 325 mesh, 400 mesh, 500 mesh, 700 mesh, 900 mesh screens.
More preferably, the screening device firstly uses a 325-mesh, 400-mesh and 500-mesh screen to conduct three-stage screening, and then materials smaller than 500-mesh screen after screening are subjected to two-stage screening of 700-mesh and 900-mesh screen.
Preferably, six grades of materials are obtained from the screening device, namely-200 meshes to +325 meshes, -325 meshes to +400 meshes, -400 meshes to +500 meshes, -500 meshes to +700 meshes, -700 meshes to +900 meshes and-900 meshes.
Preferably, the screening device is connected in parallel with the air classification device.
More preferably, the six grades of materials are respectively connected with six fan grading devices with different wind powers in parallel.
The invention also provides the application of the barium sulfate obtained by the method for recovering the barium sulfate from the shale gas drilling oil sludge dry slag or the barium sulfate obtained by the system in a drilling mud weighting agent.
The beneficial effects of the invention are as follows:
1. the invention can extract low-grade barium sulfate in dry slag of oil sludge of the rock gas drilling, the grade of the extracted barium sulfate reaches industrial grade, the grade of the obtained barium sulfate reaches more than 80 percent, the recovery rate of the barium sulfate is more than 70 percent, and the barium sulfate can be returned to a drilling platform to be used as a main component of a weighting agent, thereby realizing the cyclic utilization of the barium sulfate and relieving the exploitation requirement on the heavy-duty rock ore; the residual rock scraps can be used as cement admixture, sintered ceramsite and the like.
2. The process adopts a pure physical method for dry recovery, avoids using water and chemical agents and does not generate any new pollutants compared with the traditional flotation and reselection methods.
3. The equipment adopted by the invention only needs electric power as energy source consumption, saves resources, has wide applicability, simple scheme implementation and remarkable benefit.
Drawings
FIG. 1 is a schematic diagram of a system for recovering barium sulfate from dry sludge of shale gas drilling oil sludge
Detailed Description
The present invention will be described in further detail with reference to specific embodiments thereof in order to enable those skilled in the art to better understand the technical aspects of the invention.
The prior art is not suitable for extracting barium sulfate from shale gas drilling oil sludge, or a wet beneficiation technology is adopted, chemical reagents are used, resources are wasted, the environment is polluted, the components are high, the method is a purely physical technical scheme, no pollution is generated, the cost is low, the parameters such as the particle size, the specific gravity and the like of the barium sulfate recovered from rock scraps are especially in accordance with the requirement of weighting agents, the method can be directly applied to the drilling mud weighting agents again, and the recycling of the resources is realized.
The invention firstly provides a method for recovering barium sulfate from shale gas drilling oil sludge dry slag, which comprises the following steps:
s1, carrying out hot air dry cleaning on oil sludge dry residues to obtain coarse particles and fine particles;
s2, crushing the fine particles to obtain crushed fine particles;
s3, screening the crushed fine particles to obtain screened materials;
S4, carrying out air classification on the sieved material to obtain rock debris and barium sulfate.
Specifically, firstly, in S1, carrying out hot air dry cleaning on the surfaces of large particles of oil sludge dry residues subjected to deoiling and dewatering through fluidization and dispersion and a pneumatic principle, separating rock debris particles from attached fine particles, and obtaining coarse particles and fine particles after separation; in the embodiment of the invention, as the granularity of the barium sulfate monomer particles in the dry slag is below 40 meshes and above 40 meshes are all rock debris particles, and meanwhile, the surface of the rock debris is possibly attached with barium sulfate particles, further, the coarse particles in the S1 are rock debris particles which are larger than 40 meshes (more than 0.425 mm) and do not contain barium sulfate, and the fine particles are particles which are formed by mixing rock debris with the granularity of 40 meshes or less with the barium sulfate, so that the grade of the barium sulfate in the fine particles is improved; further, the mass of the coarse particles in the step S1 accounts for 25-40% of the mass of the oil sludge dry residue; further, the pressure is controlled to be more than 0.6MPa in the S1 hot air drying and washing process, and in order to clean fine particles on the surfaces of large particles and break up agglomerated particles with low strength, the agglomerated particles are dissociated into particle monomers.
And then crushing the fine particles obtained in the step S1, wherein the granularity of the barium sulfate which is originally added as a drilling weighting agent in the oil sludge is below 200 meshes, so that the granularity of the crushed fine particles in the step S2 is below 200 meshes, and in the crushing process, the particles above 200 meshes need to be crushed again, and the fine particles below 200 meshes can enter the next working procedure. Further, the method comprises the following steps.
And then carrying out multistage screening on the crushed fine particles, wherein the specific gravity ratio between barium sulfate and rock debris is about 2 times, so that the volume ratio between the barium sulfate and rock debris is required to be controlled within 2 times, the influence of volume is eliminated during specific gravity separation, and six grades of materials of-200 meshes to +325 meshes, -325 meshes to +400 meshes, -400 meshes to +500 meshes, -500 meshes to +700 meshes, -700 meshes to +900 meshes and 900 meshes are obtained, wherein the ratio of the upper limit to the lower limit of the volume of the particles in each grade is about 2 times.
Wherein, as an explanation of the present invention, the "+number" appearing in the present invention means greater than the number, "-number" means less than or equal to the number, such as "+325 mesh" means greater than 325 mesh, "-325 mesh" means less than or equal to 325 mesh.
And finally, carrying out air classification on the six-grade materials after screening, and separating rock debris fine particles with the density difference of about twice from barium sulfate according to the size of the air, so that the grade of the barium sulfate is over 80 percent, and the recovery rate of the barium sulfate is over 70 percent.
The invention also provides a system for realizing the method for recovering the barium sulfate from the shale gas drilling sludge dry slag, which is shown in figure 1 and comprises the following steps: a feeding device 1, a hot air dry cleaning device 2, a grinding device 3, a screening device 4 and a wind power grading device 5; the feeding device 1 is connected with the hot air dry cleaning device 2, the hot air dry cleaning device 2 comprises a first discharging hole 21 and a second discharging hole 22, the second discharging hole 22 is connected with the ore grinding device 3, the discharging hole of the ore grinding device 3 is connected with the screening device 4, and the screening device 4 is connected with the air classification device 5.
Specifically, as shown in fig. 1, the oil sludge dry residue after deoiling and dewatering is sent into a feed inlet of a hot air dry cleaning device 2 through a feeding device 1, hot air dry cleaning is carried out on the surfaces of large particles of the oil sludge dry residue through fluidization and dispersion and a pneumatic principle, rock debris particles and attached fine particles are separated, coarse particles are obtained after separation and discharged from a first discharge hole 21, and fine particles are discharged from an air outlet through clean air after dust removal from a second discharge hole 22. The content of barium sulfate in coarse particles obtained by separation in the step is reduced to below 5%, and the mass of the coarse particles accounts for 25% -40% of the total mass of the sludge dry slag; the grade of barium sulfate in the fine particles is improved; the parameters controlled in the step are blowing pressure (more than 0.6 Mpa), so as to clean fine particles on the surfaces of large particles and break up agglomerated particles with lower strength, and dissociate the agglomerated particles into particle monomers. In the embodiment of the invention, the feeding device 1 can select a screw feeder; the hot air dry cleaning device 2 can select a hot air particle dry cleaning machine, namely a particle blowing machine, and the force for controlling the hot air dry cleaning by parameter adjustment is larger than the force required by the dissociation of the agglomerate and smaller than the force required by the crushing of the particles; further, the coarse particles are particles larger than 40 meshes, and the fine particles are particles smaller than or equal to 40 meshes.
Then, the fine particles discharged from the second discharge port 22 are crushed by the ore grinding device 3; the grinding device 3 comprises dry grinding equipment such as an airflow grinding machine, a disc grinding machine, a steam kinetic energy grinding machine and the like, but a wet grinding machine such as a ball mill and the like cannot be adopted, and the equipment selection principle is that the diameter-to-distance ratio of the broken particles is as small as possible. In the embodiment of the invention, the ore grinding device 3 is an ore grinding machine, the ore grinding granularity is controlled to be 200 meshes (0.075 mm) through the parameters of the ore grinding machine, the particles with more than 200 meshes are returned to the ore grinding machine for re-grinding, and the particles with less than 200 meshes are discharged through the discharge hole of the ore grinding machine.
Then, crushed fine particles discharged from a discharge port of the ore grinding device 3 are sent into a screening device 4; the screening equipment comprises dry screening equipment such as a vibrating screening machine, an ultrasonic screening machine, a linear screen and the like, but wet screening equipment such as a cyclone and the like cannot be adopted; the material is divided into a plurality of particle size fractions by multistage screening. In the embodiment of the present invention, to ensure the screening effect and efficiency of the screening device, a single screening device is only loaded with three sets of screens, so that the screening device is formed by connecting a first screening device 41 and a second screening device 42 in series, and the process is as follows: the first screening apparatus 41 employs a multi-stage screen having: 325 mesh (0.045 mm), 400 mesh (0.038 mm) and 500 mesh (0.031 mm), the grain size range of the obtained material is four grades of-200 mesh to +325 mesh, -325 mesh to +400 mesh, -400 mesh to +500 mesh and-500 mesh; the 500 mesh material enters a second screening device 42 in series, the second screening device 42 employing a multi-stage screen having: the grain size range of the obtained materials is three grades of-500 meshes to +700 meshes, -700 meshes to +900 meshes and-900 meshes, and finally six grades of materials of-200 meshes to +325 meshes, -325 meshes to +400 meshes, -400 meshes to +500 meshes, -500 meshes to +700 meshes, -700 meshes to +900 meshes and-900 meshes are obtained.
Finally, the screening device 4 is connected with the air classification device 5 in parallel, and the screened material is sent into the air classification device 5. In the embodiment of the invention, the six grades of materials are respectively sent to six parallel air classification devices 5, namely, materials with the mesh size ranging from minus 200 to plus 325 are sent to the first air classification device 51, materials with the mesh size ranging from minus 325 to plus 400 are sent to the second air classification device 52, materials with the mesh size ranging from minus 400 to plus 500 are sent to the third air classification device 53, materials with the mesh size ranging from minus 500 to plus 700 are sent to the fourth air classification device 54, materials with the mesh size ranging from minus 700 to plus 900 are sent to the fifth air classification device 55, and materials with the mesh size ranging from minus 900 are sent to the sixth air classification device 56. The separation of the rock debris fine particles and the barium sulfate with the density difference of about twice is realized by adopting the air classification device 5, wherein the barium sulfate is discharged from a front heavy discharge port, the rock debris is discharged from a rear discharge port, and the grade of the barium sulfate is over 80 percent, and the recovery rate of the barium sulfate is over 70 percent. The wind power classifying device used in the embodiment of the invention is an air flow classifier.
The invention also provides application of the barium sulfate obtained by the method for recovering the barium sulfate from the shale gas drilling oil sludge dry slag or the barium sulfate obtained by the system for recovering the barium sulfate from the shale gas drilling oil sludge dry slag in drilling mud weighting agents.
Example analysis:
the content of barium sulfate in the dry residue remained after the oil sludge is treated by a certain oil sludge treatment company in Sichuan is 35%, and the particle size of barium sulfate monomer particles is smaller than 200 meshes; the laser particle size analyzer tests show that the dry slag has a wide particle size range, the particles with the particle size of minus 900 meshes are smaller than 15%, the particles with the particle size of plus 40 meshes are larger than 30%, the particles with the particle size of minus 40 meshes to plus 900 meshes are about 55%, and the surface of the large particles is attached with micro dust and obvious agglomerates. The barium content exceeds the requirement of cement admixture, so that the barium content cannot be comprehensively utilized, and the grade of the barium sulfate product is too low to be used as a barium sulfate product, and the barium sulfate product can only be accumulated as common solid waste and is difficult to be absorbed.
By using the dry recovery method of the invention, 32% of coarse rock dust particles (+40 meshes) are separated from the hot air dry cleaning device 2, wherein the content of barium sulfate is reduced to 5%; the fine particles sequentially pass through the ore grinding device 3, the first vibration screening machine 41 and the second vibration screening machine 42 to obtain materials with six particle size sections of-200 meshes to +325 meshes, -325 meshes to +400 meshes, -400 meshes to +500 meshes, -500 meshes to +700 meshes, -700 meshes to +900 meshes and-900 meshes, and respectively enter six air flow classifiers, barium sulfate and rock fragments are obtained from a discharge port of the air flow classifiers and are respectively mixed. By calculation, by adopting the method, 339kg of the barium sulfate product with the grade of 82 percent is extracted from 1000kg of oil sludge dry slag, and the recovery rate is 76.4 percent. Through detection, according to the standard GB/T5005-2010 drilling fluid material Specification, the density of the recovered barium sulfate is 4.17, and the density reaches the II-level standard; the water-soluble alkaline earth metal is 0mg/kg, the screen residue is 0.9% of 75 mu m, the viscosity effect is less than 62 mPa.s, and all the water-soluble alkaline earth metal meets the requirements of weighting agent parameters specified by the standard.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (5)
1. The method for recovering the barium sulfate from the shale gas drilling oil sludge dry slag is characterized by comprising the following steps of:
s1, carrying out hot air dry cleaning on oil sludge dry residues to obtain coarse particles and fine particles;
s2, crushing the fine particles to obtain crushed fine particles;
s3, screening the crushed fine particles to obtain screened materials;
s4, carrying out air classification on the sieved material to obtain rock scraps and barium sulfate;
The coarse particles in the step S1 are particles with the particle size of more than 40 meshes, and the fine particles are particles with the particle size of less than or equal to 40 meshes;
In the step S3, the crushed fine particles are subjected to multi-stage screening to obtain six grades of materials of minus 200 meshes to minus 325 meshes, minus 325 meshes to plus 400 meshes, minus 400 meshes to plus 500 meshes, minus 500 meshes to minus 700 meshes, minus 700 meshes to plus 900 meshes and minus 900 meshes;
The method relies on system implementation, the system comprising: the device comprises a feeding device, a hot air dry cleaning device, a grinding device, a screening device and an air classification device; the feeding device is connected with the hot air dry cleaning device, the hot air dry cleaning device comprises a first discharge hole and a second discharge hole, the second discharge hole is connected with the ore grinding device, the discharge hole of the ore grinding device is connected with the screening device, and the screening device is connected with the air classification device;
the screening device is provided with a multi-stage screen, including 325-mesh, 400-mesh, 500-mesh, 700-mesh and 900-mesh screens;
the screening device firstly uses a 325-mesh, 400-mesh and 500-mesh screen to carry out three-stage screening, and then carries out two-stage screening of 700-mesh and 900-mesh screens on the screened materials smaller than 500-mesh screen;
The six grades of materials are respectively connected with six fan grading devices with different wind powers in parallel.
2. The method for recovering barium sulfate from shale gas drilling sludge dry slag according to claim 1, wherein the control pressure in the S1 hot air drying and washing process is more than 0.6 MPa.
3. The method for recovering barium sulfate from shale gas drilling sludge dry slag of claim 1, wherein the granularity of the fine particles after crushing in S2 is 200 mesh or less.
4. The method for recovering barium sulfate from shale gas drilling sludge dry slag of claim 1, wherein the coarse particles are discharged from a first discharge port and the fine particles are discharged from a second discharge port.
5. Use of barium sulfate obtained by the method for recovering barium sulfate from shale gas drilling sludge dry slag according to claim 1 in a drilling sludge weighting agent.
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| CN115213197A (en) * | 2022-07-07 | 2022-10-21 | 四川君和环保股份有限公司 | Dry recovery method for low-grade barium sulfate in oil sludge dry slag of shale gas drilling well |
| CN115340121A (en) * | 2022-10-14 | 2022-11-15 | 四川君和环保股份有限公司 | Method for separating barite from shale gas drilling mud |
| CN116947083B (en) * | 2023-08-03 | 2024-08-27 | 四川华洁嘉业环保科技有限责任公司 | Method for extracting barium sulfate by oil-based rock debris air flow grinding method |
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| GB1023119A (en) * | 1963-10-10 | 1966-03-16 | Grace W R & Co | Improvements in or relating to the beneficiation of phosphate ores |
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