CN115155797A - Coal slime flotation purification method - Google Patents
Coal slime flotation purification method Download PDFInfo
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- CN115155797A CN115155797A CN202210891905.7A CN202210891905A CN115155797A CN 115155797 A CN115155797 A CN 115155797A CN 202210891905 A CN202210891905 A CN 202210891905A CN 115155797 A CN115155797 A CN 115155797A
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
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Abstract
The invention provides a method for flotation and purification of coal slime, which comprises the following steps of firstly, mixing the coal slime with water to obtain slime water, and obtaining coarse particle impurities and fine particle coal slime after classification by a classification drum; then, mixing the fine-particle coal slime obtained in the step to obtain raw slurry concentrated by coal slime water, and grinding the raw slurry by a cell grinder to obtain cooked slurry; and finally, performing primary roughing and secondary fine selection on the cooked slurry obtained in the step by using a flotation system, and then concentrating and filter-pressing to obtain clean coal. The invention utilizes the classification principle of combining classification screening, cell grinding, rough and fine flotation and concentration to realize the high-efficiency purification and recovery of low-ash and low-ash clean coal in the coal slime, and has the advantages of low investment, high efficiency, simple process and good economic benefit, the recovery rate of the coal slime flotation and purification method is up to 90-95 percent, the resource waste is greatly reduced, the resource utilization rate is improved, the economic benefit is improved, and simultaneously, the discharged coal slime amount is also greatly reduced.
Description
Technical Field
The invention belongs to the technical field of coal slime treatment, and relates to a coal slime flotation and purification method.
Background
Coal slime is an accessory product generated in the working process of coal washing plants, and is a semi-solid object formed by mixing coal powder and water. However, coal slime has large differences in quality and availability depending on the carbon content of coal, and is of many kinds and difficult to use. With the improvement of scale and centralization degree of the coal industry, the yield of coal slime is greatly increased, but because the coal slime cannot be fully utilized, resource accumulation and pollution are caused, and how to effectively utilize the resources becomes unbearable. The coal slime is formed by coal washing to obtain coal slime particles, wherein the coal slime particles contain sticky matters formed by fine coal, pulverized bone stones and water, and have the characteristics of fine coal granularity, high coal particle content, high water content and ash content, low heat value, strong cohesiveness and large cohesive force. Because the ash content, the sulfur content and the moisture content are relatively high, the direct utilization of the water is difficult, and even if the water is utilized, good economic benefit is difficult to obtain, and the water is rejected by power consumers for a long time.
Therefore, the waste coal slime of the coal preparation plant becomes a large environmental pollution source at the site. And when the coal slime is stacked, the form is extremely unstable, the coal slime can be lost when meeting water, and can fly up when being dried by air, thereby not only wasting precious coal resources, but also causing serious environmental pollution. The potential safety hazard of the tailing pond even restricts the normal production of the coal preparation plant, and becomes a relatively troublesome problem of the coal preparation plant. In recent years, the national economy has rapidly developed, the coal yield has leap the first place in the world, and the market situation has also changed greatly. The depth and the breadth of coal processing are rapidly developed, the yield of the coal slime is obviously increased, and the comprehensive utilization of the coal slime becomes a problem to be urgently solved.
Although coal slime treatment is one of the most important links of a power coal preparation plant, most of the existing coal slime treatment methods of the power coal preparation plant are that coal slime water is settled and concentrated by a thickener, dewatered by a plate-and-frame filter press and then directly discharged. The coal slime treatment method has serious resource waste and serious later-stage environmental protection treatment hidden trouble, namely firstly dust flying in a coal slime stacking field pollutes surrounding atmosphere, secondly local underground water is polluted after the coal slime is infiltrated, and finally the discharged coal slime is used as solid waste to damage vegetation in the discharging field.
Therefore, how to find a more suitable coal slime treatment mode, solving the problems existing in the existing coal slime treatment process, having simple process and large capacity, being more convenient for industrialized popularization and use, becomes one of the problems to be solved urgently by a plurality of research and development type enterprises in the industry.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a method for coal slime flotation and purification. The flotation purification provided by the invention realizes the separation of single particles in the coal slime to strip clean coal and ash impurities by utilizing a monomer dissociation beneficiation principle combining classified screening, cell grinding, flotation and concentration, thereby realizing the high-efficiency purification and recovery of high-ash clean coal slime.
The invention provides a method for coal slime flotation purification, which comprises the following steps:
1) The coal slime water mixed with the coal slime and water is sieved and graded by a grading drum to obtain graded coarse particle impurities and fine particle coal slime;
2) Mixing the fine particle coal slime obtained in the step to obtain raw slurry concentrated by coal slime water, and grinding the raw slurry by a cell mill to obtain cooked slurry;
3) And (3) performing primary roughing and secondary fine concentration on the cooked slurry obtained in the step through a flotation system, and then concentrating and filter-pressing to obtain clean coal.
Preferably, the coal slurry comprises primary coal slurry and secondary coal slurry;
the coal content of the primary coal slime is 10-20%;
the coal content of the secondary coal slime is 5-10%.
Preferably, the coarse particle impurities are coarse particle impurities with the particle size of more than 5 mm;
the fine-particle coal slime is fine-particle coal slime with the particle size of less than or equal to 5 mm;
the slurry mixing mode comprises slurry mixing by a stirring barrel and/or a stirrer;
the solid content of the raw slurry is 35-45%.
Preferably, the D90 particle size of the cooked pulp after the cell grinding is less than or equal to 2 mu m;
a step of dehydration by a laminated sieve is also included between the concentration step and the filter pressing step;
the water content of the filtered clean coal is less than or equal to 5 percent.
Preferably, the water obtained in one or more of the concentration, filter pressing and laminated sieve dewatering steps is returned to the mixing step of the coal slime and the water in the step 1) as circulating water.
Preferably, the flotation system comprises a flotation cell;
the primary roughing comprises performing primary roughing by adopting a first flotation tank;
the two beneficiating operations include a first beneficiating operation using a second flotation cell and a second beneficiating operation using a third flotation cell.
Preferably, primary tail sweeping is carried out before the classified coarse particle impurities enter a tailing pond;
performing primary tail sweeping before the coal slime impurities subjected to the primary roughing enter a tailing pond;
and performing primary tail sweeping before the coal slime impurities after twice concentration enter a tailing pond.
Preferably, the primary tail sweeping mode comprises flotation of a flotation tank;
circularly returning the coal slime containing clean coal after primary tail sweeping to the boiled pulp after cell grinding;
and discharging the coal slime subjected to primary tail sweeping to a tailing pond.
Preferably, the fixed carbon content in the clean coal is more than or equal to 60.40%;
the ash content in the clean coal is less than 5 percent;
the lower calorific value in the clean coal is more than 30.66MJ/kg.
Preferably, the clean coal is low-ash fine-particle clean coal slurry;
the recovery rate of the coal slime flotation purification method is 90-95%.
The invention provides a method for flotation and purification of coal slime, which comprises the following steps of firstly, mixing the coal slime with water to obtain slime water, and obtaining coarse particle impurities and fine particle coal slime after classification by a classification drum; then, mixing the fine-particle coal slime obtained in the step to obtain raw slurry concentrated by coal slime water, and grinding the raw slurry by a cell grinder to obtain cooked slurry; and finally, performing primary roughing and secondary fine selection on the cooked slurry obtained in the step by using a flotation system, and then concentrating and filter-pressing to obtain clean coal. Compared with the prior art, the coal slime flotation purification method provided by the invention adopts the cell grinding and grinding to perform monomer dissociation on the concentrate and the gangue minerals so as to strip the concentrate and the gangue minerals. The production process is flexible, the process technology is advanced, the technical content is high, and the product quality is ensured; meanwhile, the whole flotation process is uniformly, scientifically and reasonably matched on the basis of the capacity and power of the cell mill and the production capacity of the production line, and the high-ash coal slime in the coal slime is efficiently purified and recycled by utilizing a monomer dissociation beneficiation principle combining classified screening, cell milling, flotation and selection, and the method is very favorable for daily operation and future extension of the production line. The method for flotation and purification of the coal slime can improve the yield of clean coal, increase economic benefits, change waste into valuable, ensure the normal work of a coal slime water system, realize water recycling, and has the advantages of stable equipment operation, low investment, low failure rate and good risk control performance. Easy environmental protection and control, low noise, low vibration, and no dust in wet grinding. In the aspect of environmental protection, the wet grinding of the process is a grinding production in a liquid state by using a physical mode, and no dust is generated. The production line achieves the minimum generation of dust, waste residue and waste water in production operation through good design and construction and scientific operation management.
The method provided by the invention has the advantages of low investment, high efficiency, simple process and good economic benefit, the recovery rate of the coal slime flotation purification method is up to 90-95%, the resource waste is greatly reduced, the resource utilization rate is improved, the economic benefit is improved, and meanwhile, the coal slime discharge amount is greatly reduced.
The industrial practical operation result shows that the recovery rate of the coal slime flotation purification method provided by the invention is 90-95%, the fixed carbon content of the recovered clean coal slime is not less than 60.40%, the ash content is less than 5%, and the low-grade calorific value is more than 30.66MJ/kg.
Drawings
FIG. 1 is a schematic diagram of a process flow system of the coal slurry flotation purification method provided by the invention.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the present invention are described below in conjunction with the examples, but it should be understood that these descriptions are only intended to further illustrate the features and advantages of the present invention and are not intended to limit the patent claims of the present invention.
All starting materials for the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the invention are not particularly limited in purity, and the invention preferably adopts industrial purity or purity conventional in the technical field of coal slurry treatment.
All the noun expressions and acronyms of the invention belong to the conventional noun expressions and acronyms in the field, each noun expression and acronym is clearly and definitely clear in the relevant application field, and a person skilled in the art can clearly, exactly and uniquely understand the noun expressions and acronyms.
The invention provides a method for coal slime flotation purification, which comprises the following steps:
1) The method comprises the following steps of (1) screening and grading slime water obtained by mixing the slime and water by a grading drum to obtain graded coarse particle impurities and fine particle slime;
2) Mixing the fine-particle coal slime obtained in the step to obtain raw slurry concentrated by coal slime water, and grinding the raw slurry by a cell grinder to obtain cooked slurry;
3) And (3) performing primary roughing and secondary fine concentration on the cooked slurry obtained in the step through a flotation system, and then concentrating and filter-pressing to obtain clean coal.
The invention firstly carries out the grading of the slime water mixed with the slime and water by a grading roller to obtain the graded coarse particle impurities and fine particle slime.
In the present invention, the coal slurry preferably includes primary coal slurry and secondary coal slurry.
In the invention, the coal content of the primary coal slime is preferably 10-20%, more preferably 12-18%, and more preferably 14-16%.
In the invention, the coal content of the secondary coal slime is preferably 5-10%, more preferably 6-9%, and more preferably 7-8%.
In the present invention, the coarse-grained impurities are preferably coarse-grained impurities having a grain size >5 mm.
In the invention, the fine-particle slime water is preferably fine-particle slime water with the particle size less than or equal to 5 millimeters.
The fine particle coal slime obtained in the step is subjected to size mixing to obtain raw slurry concentrated by coal slime water, and the raw slurry is subjected to cell grinding to obtain cooked slurry.
In the present invention, the slurry mixing manner preferably includes mixing with a mixing tank and/or a mixer.
In the present invention, the solid content of the raw slurry is preferably 35% to 45%, more preferably 37% to 43%, and more preferably 39% to 41%.
In the present invention, the D90 particle size of the cell mill-milled mature pulp is preferably 2 μm or less, more preferably 1.5 μm or less, and still more preferably 1.0 μm or less.
In the present invention, a laminated sieve dewatering step is preferably further included between the concentration and pressure filtration steps.
In the present invention, the water content of the cleaned coal after press filtration is preferably 5% or less, more preferably 4% or less, and still more preferably 3% or less.
In the present invention, the water obtained in one or more of the concentration, pressure filtration and laminated sieve dewatering steps is preferably returned to the mixing step of the coal slurry and water in the step 1) as circulating water.
The invention finally passes the cooked slurry obtained in the above steps through a flotation system, and after once roughing and twice fine selection, the concentrated and filter-pressed slurry is obtained.
In the present invention, the flotation system preferably comprises a flotation cell.
In the present invention, the primary rougher flotation preferably comprises primary rougher flotation using a first flotation cell.
In the present invention, said two beneficiating preferably comprises a first beneficiating in a second flotation cell and a second beneficiating in a third flotation cell.
In the invention, the classified coarse particle impurities preferably enter a tailing pond for primary tailing sweeping.
In the invention, the impurities after two times of concentration are preferably fed into a tailing pond for one-time tail sweeping.
In the present invention, the one-time tail sweeping mode preferably comprises flotation of a flotation cell.
In the invention, the coal slurry containing clean coal after primary tail sweeping is preferably recycled and returned to the cooked slurry after cell grinding.
In the present invention, the fixed carbon content in the clean coal is preferably not less than 60.40%.
In the present invention, the ash content in the clean coal is preferably < 5%, more preferably < 4%, more preferably < 3%.
In the invention, the lower calorific value in the fine coal slime is preferably more than 30.66MJ/kg.
In the present invention, the clean coal is preferably low-ash fine-particle clean coal slurry.
In the invention, the recovery rate of the coal slime flotation purification method, namely the mass ratio of the fine coal slime to the coal slime raw material, is preferably 90-95%.
The invention is a complete and refined integral flotation purification process, better ensures the stability of the process and further improves the flotation purification effect, and the coal slime flotation purification method preferably comprises the following steps:
coal slurry, namely wet coal with the granularity of below 5mm in a coal preparation plant, and floating coal preparation is an effective method for separating the coal slurry. The source of the coal slime: (1) The primary coal slime is contained in the selected raw coal, namely generated in the mining and transportation processes and accounts for 10-20% of the selected raw coal; (2) secondary coal slime: the coal is produced by crushing and argillization in the coal dressing process and accounts for 5-10% of the selected raw coal. The total content of the two components is about 15 to 30 percent. The flotation method is adopted to select clean coal from a large amount of coal slime, so that the yield of the clean coal is improved, and the economic benefit is increased.
System for purifying and recovering fine coal slime from coal slime, the system includes: grading drum sieve, cell grinding, flotation, primary selection, secondary selection, thickener, laminated sieve and plate-and-frame filter press.
The specific method comprises the following steps:
(1) And (3) pouring the coal slime into a chute, flushing the coal slime into a drum screen by water, and grading the system coal slime water by a grading swirler.
(2) After grading, coarse particles with the diameter of more than 5mm enter tailings, fine particles with the diameter of less than or equal to 5mm enter a coal slurry pond, and then the coarse particles are pumped into hydraulic cyclone by a slurry pump to concentrate coal slurry water into raw slurry with the solid content of 35-45%. Pumping the raw pulp into a cell mill by a diaphragm pump through a storage tank, grinding the raw pulp into the required particle size with the D90 being less than or equal to 2um by the cell mill, and storing the ground cooked pulp in a finished product storage tank.
(3) And (3) enabling the boiled pulp to enter a flotation system for primary roughing (a flotation tank No. 1) and secondary fine selection (a flotation tank No. 2/3), enabling the flotated impurities to enter a tailing pond, and performing primary tailing sweeping (a flotation tank No. 4). The flotation tank is used for one-time roughing, two-time fine selection and one-time tailing sweeping, and 4 flotation tanks are arranged in the whole system.
(4) Concentrate meeting the technical standard firstly enters a thickener for concentration, is subjected to preliminary dehydration, then passes through a laminated sieve and enters a filter press for filter pressing of slurry until the water content is less than or equal to 5 percent, and a final product is formed. And the wastewater is recycled after being filtered by the filter press, so that virtuous cycle is realized.
According to the invention, the primary classification of the coal slime is realized by arranging the classification drum sieve, the subsequent desliming workload of the laminated sieve is reduced, then the materials are ground to the particle size required by flotation through the cell mill, and the clean coal is obtained through rough concentration, secondary concentration, concentration and filter pressing. Wherein, the sorted coarse particles and the impurities after flotation and selection enter a tailing pond, and the generated wastewater returns to the system for recycling.
Referring to fig. 1, fig. 1 is a schematic diagram of a process flow system of a coal slime flotation and purification method provided by the invention.
The invention provides a method for coal slime flotation and purification. The cell grinding is adopted, the ore concentrate and the gangue ore are subjected to monomer dissociation, the production process flow is flexible, the process technology is advanced, the technical content is high, and the product quality is ensured; meanwhile, the whole flotation process is uniformly, scientifically and reasonably matched based on the capacity and power of the cell mill and the production capacity of the production line, and the efficient purification and recovery of low-ash coarse-particle fine coal slime in the coal slime are realized by utilizing a monomer dissociation beneficiation principle combining classified screening, cell milling and coarse fine flotation, so that the method is very favorable for daily operation and future extension of the production line. The method for flotation and purification of the coal slime can improve the yield of clean coal, increase economic benefits, change waste into valuable, ensure the normal work of a coal slime water system, realize water recycling, and has the advantages of stable equipment operation, low investment, low failure rate and good risk control performance. Easy environmental protection and control, low noise, low vibration, and low dust in wet grinding. In the aspect of environmental protection, the wet grinding of the process is a grinding production in a liquid state by using a physical mode, and no dust is generated. The production line achieves the minimum generation of dust, waste residue and waste water in production operation through good design and construction and scientific operation management.
The method provided by the invention has the advantages of low investment, high efficiency, simple process and good economic benefit, the recovery rate of the coal slime flotation purification method is up to 90-95%, the resource waste is greatly reduced, the resource utilization rate is improved, the economic benefit is improved, and meanwhile, the coal slime discharge amount is greatly reduced.
The industrial practical operation result shows that the recovery rate of the coal slime flotation purification method provided by the invention is 90-95%, the fixed carbon content of the recovered clean coal slime is not less than 60.40%, the ash content is less than 5%, and the low-grade heat productivity is more than 30.66MJ/kg.
For further illustration of the present invention, the following will describe in detail a coal slurry flotation purification method provided by the present invention with reference to the following examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and specific operation procedures are given, only for further illustration of the features and advantages of the present invention, not for limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the following examples.
Example 1
The system of clean coal mud is retrieved in purification in the coal slime, and the system mainly includes: grading drum sieve, cell grinding, flotation, primary selection, secondary selection, thickener, laminated sieve and plate-and-frame filter press.
As shown in fig. 1.
(1) And (3) pouring the coal slime into a chute, flushing the coal slime into a drum screen by water, and grading the system coal slime water by a grading swirler.
(2) After classification, coarse particle impurities with the particle size of more than 5mm enter a tailing pond to be swept to the tail, fine particles with the particle size of less than or equal to 5mm enter a coal slurry pond, and then the fine particles are pumped into hydraulic cyclone through a slurry pump to concentrate coal slurry water into raw slurry with the solid content of 40%. Pumping the raw pulp into a cell mill by a diaphragm pump through a storage tank, grinding the raw pulp into the required particle size with the D90 being less than or equal to 2um by the cell mill, and storing the ground cooked pulp in a finished product storage tank.
(3) And (3) enabling the boiled pulp to enter a flotation system for primary roughing (a flotation tank No. 1) and secondary fine separation (a flotation tank No. 2/3), enabling the floated impurities to enter a tailing pond, and performing primary tailing sweeping (a flotation tank No. 4). The flotation tank is used for one-time roughing, two-time fine selection and one-time tailing sweeping, and 4 flotation tanks are arranged in the whole system.
(4) Concentrate meeting the technical standard firstly enters a thickener for concentration, is subjected to preliminary dehydration, then passes through a laminated sieve and enters a filter press for filter pressing of slurry until the water content is less than or equal to 5 percent, and a final product is formed. And the wastewater is filtered by the filter press and then recycled, so that water conservation and emission reduction are facilitated, and virtuous circle is realized.
The coal slime processed in the embodiment 1 of the invention is detected:
according to the detection results, the process method achieves ideal effects through multiple experimental verifications of our part and analysis of the inspection results of multiple batches of samples, wherein the common ash content of 1-K inspection samples is 2.4%, the fixed carbon content reaches 63.86%, and the calorific value of clean coal reaches 31.78 (MJ/kg); the common ash content of a 2-K sample to be detected is 6.95 percent, the fixed carbon content reaches 60.4 percent, and the calorific value of clean coal reaches 29.43 (MJ/kg); the common ash content of a 3-K sample to be detected is 3.1 percent, the fixed carbon content reaches 63.06 percent, and the calorific value of clean coal reaches 30.66 (MJ/kg).
Therefore, the scheme has extremely high-efficiency production efficiency for extracting the coal slime and has extremely high economic value.
The foregoing has outlined, in detail, a method for the flotation purification of coal slurry according to the present invention so that the detailed description of the invention that follows may be better understood, and in particular, the present invention may be better understood by reference to the following detailed description of the invention when taken in conjunction with the accompanying drawings. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. A coal slime flotation purification method is characterized by comprising the following steps:
1) The coal slime water mixed with the coal slime and water is sieved and graded by a grading drum to obtain graded coarse particle impurities and fine particle coal slime;
2) Mixing the fine particle coal slime obtained in the step to obtain raw slurry concentrated by coal slime water, and grinding the raw slurry by a cell mill to obtain cooked slurry;
3) And (3) performing primary roughing and secondary fine concentration on the cooked slurry obtained in the step through a flotation system, and then concentrating and filter-pressing to obtain clean coal.
2. The method of claim 1, wherein the coal slurry comprises primary coal slurry and secondary coal slurry;
the coal content of the primary coal slime is 10-20%;
the coal content of the secondary coal slime is 5-10%.
3. The method of claim 1, wherein the coarse particulate impurities are coarse particulate impurities having a particle size >5 mm;
the fine-particle coal slime is fine-particle coal slime with the particle size of less than or equal to 5 mm;
the pulp mixing mode comprises mixing of a mixing barrel and/or a mixer;
the solid content of the raw slurry is 35-45%.
4. The method according to claim 1, wherein the D90 particle size of the cell mill-milled mature pulp is 2 μm or less;
a step of dehydration by a laminated sieve is also included between the concentration step and the filter pressing step;
the water content of the clean coal after filter pressing is less than or equal to 5 percent.
5. The method as claimed in claim 4, wherein the water obtained in one or more of the concentration, filter pressing and stacked screen dewatering steps is returned as recycled water to the mixing step of the coal slurry and water in step 1).
6. The method of claim 1, wherein the flotation system comprises a flotation cell;
the primary roughing comprises performing primary roughing by adopting a first flotation tank;
the two beneficiation includes a first beneficiation performed by the second flotation cell and a second beneficiation performed by the third flotation cell.
7. The method according to claim 1, wherein the classified coarse particle impurities are subjected to one tail sweeping before entering a tailing pond;
performing primary tail sweeping before the coal slime impurities subjected to the primary roughing enter a tailing pond;
and performing primary tail sweeping before the coal slime impurities after twice concentration enter a tailing pond.
8. The method of claim 7, wherein the one sweep mode comprises flotation cell flotation;
circularly returning the coal slime containing clean coal after primary tail sweeping to the boiled pulp after cell grinding;
and discharging the coal slime subjected to primary tail sweeping to a tailing pond.
9. The method of claim 1, wherein the fixed carbon content of the clean coal is no less than 60.40%;
the ash content in the clean coal is less than 5 percent;
the lower calorific value in the clean coal is more than 30.66MJ/kg.
10. The method of claim 1, wherein the clean coal is low ash fine particle clean coal slurry;
the recovery rate of the coal slime flotation purification method is 90-95%.
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| AU2020102453A4 (en) * | 2020-09-28 | 2020-11-12 | Shandong University Of Science And Technology | Efficient Deep Coal Slime Separation Process |
| CN113492054A (en) * | 2021-07-22 | 2021-10-12 | 山西华阳集团新能股份有限公司 | Method for refining ultra-low ash anthracite |
| CN114317060A (en) * | 2021-11-16 | 2022-04-12 | 华阳新材料科技集团有限公司 | Chemical purification method for preparing ultra-high-purity coal by selecting clean coal |
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