CN109746116B - Water medium separation-based coal-to-liquid raw material coal enrichment separation method - Google Patents
Water medium separation-based coal-to-liquid raw material coal enrichment separation method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
- B03B5/10—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on jigs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
- B03B5/66—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type of the hindered settling type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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Abstract
A coal-to-oil raw material coal enrichment process based on aqueous medium separation is applicable to the field of low-rank coal separation. The method comprises the following steps: the method comprises the following steps of 3mm grading operation, jigging sorting operation, TBS sorting operation and dehydration operation of each product, wherein raw material coal with the size of +3mm is subjected to jigging sorting to obtain block clean coal and tail coal, raw material coal with the size of-3 mm is subjected to TBS interference bed sorting to obtain tail clean coal and tail coal, and each product is subjected to dehydration treatment to obtain a final product, the effective sorting of each coal rock component is realized by utilizing the density difference among different coal rock components, and qualified clean coal is provided for a subsequent oil ring section made of coal. The method is suitable for the low-metamorphic-degree coal for liquefaction with large density difference of different coal rock components, a medium recovery process and a flotation process are not required to be added, the process flow is greatly simplified, and the enterprise cost and investment are reduced.
Description
Technical Field
The invention relates to a sorting method, in particular to a sorting method for coal-to-liquids raw material coal enrichment based on aqueous medium sorting, which is applied to the field of low-rank coal sorting.
Background
Coal, petroleum and natural gas are the three most main fossil energy sources in China, and development and utilization of the fossil energy sources play a decisive role in economic development of China. China has proved that the oil reserves are extremely limited, more than half of the oil is imported every year, and the import quantity is still continuously increased. On the other hand, the coal resources in China are relatively rich, coal is still the most stable and reliable energy in a period of time in the future, and China has quite rich low-rank coal reserves suitable for direct coal liquefaction, the low-rank coal can be liquefied into liquid fuel to replace petroleum in the coal utilization process, and the dependence of the petroleum on the outside is reduced, so that the research on the enrichment technology of the liquefied active ingredients of the low-rank coal is very important, and the method has important strategic significance for improving the current situation of petroleum shortage in China.
From the viewpoint of coal petrology, coal for liquefying low-rank coal contains three coal petrography micro-components: vitrinite, inert matter and chitin, wherein vitrinite and inert matter are used as main components, and the content of chitin is very low and is generally less than 1%. The vitrinite and the chitin are active ingredients of low-rank coal liquefaction, the inertinite is inactive ingredients of low-rank coal liquefaction, and the liquefaction activities are ranked as follows: the chitinous group, the vitrinite group and the inertinite group, so that the enrichment of the components of the chitinous group and the vitrinite group (mainly vitrinite group) coal rock in the low-rank coal can enhance the activity of the liquefaction reaction and improve the recovery rate of the liquefied oil product. Research shows that the oil recovery rate can be improved by 4% when the content of the active coal rock component is improved by 10%, so that the economic benefit of enterprises is greatly improved, and the enrichment of the coal rock component has great significance for the liquefaction of low-rank coal.
A large amount of low-ash, low-sulfur and low-phosphorus high-quality low-rank coal for liquefaction exists in new areas such as Shanxi Mongolia and Ganqining in China, and the low-rank coal has good reaction activity and can be used as a petroleum substitute after being directly liquefied. At present, research fields of scholars and enterprises on coal-to-oil technologies are wider and deeper, and research problems are deeper and deeper, wherein a million-ton coal-to-oil demonstration project implemented by Shenhua coal-to-oil company is strategic exploration on the coal-to-oil technologies. The coal for producing oil from Shenhua coal has a special coal preparation plant for producing oil from coal, and clean coal selected by the coal preparation plant is used as raw material coal for producing oil from coal, but the clean coal produced by the coal preparation plant has high content of inert components, which always restricts the improvement of the recovery rate of oil products and simultaneously restricts the increase of profit margin, so that the active components in the clean coal need to be further enriched. The existing process adopts a 50-0.5mm size fraction heavy medium cyclone after selectively crushing raw material coal and a 0.5mm size fraction flotation process to obtain vitrinite-rich and inertinite-rich coal, however, the coal for producing oil from Shenhua coal belongs to low-rank coal and has the following characteristics that the difference of hydrophilicity is small due to the molecular structure of the low-rank coal; the active ingredient content is larger in the coarse fraction and smaller in the fine fraction, especially-0.5 mm fraction. Therefore, the flotation link has little significance for coal rock component enrichment, the lower limit of the separation of the dense medium cyclone is higher, fine particle fractions such as 3-0.5mm particle fractions are difficult to obtain efficient separation, a medium recovery flow needs to be added, the process is complicated, and the investment cost is increased, so that the development of the process flow which can effectively separate 50-0.5mm coal for the liquefied raw material is urgent to solve in the coal rock enrichment process, the process is simple, and the investment is smaller.
Disclosure of Invention
The technical problem is as follows: aiming at the defects of the technology, the separation method for coal-to-liquid raw material coal enrichment based on water medium separation is provided, which has the advantages of low cost, high separation efficiency, reasonable process and obvious economic benefit.
The technical scheme is as follows: the invention relates to a separation method for enriching coal-to-liquids raw material coal based on aqueous medium separation, which comprises the following steps:
a. feeding the raw material coal into a grading sieve for 3mm grading, thereby obtaining two coal materials with the grain size of more than 3mm and the grain size of less than 3 mm:
b. feeding coal materials with the particle size of more than 3mm into a jigger for sorting, after layering light and heavy products in the jigger, feeding the light products into a piece of clean coal products and screen drainage water on a clean coal dewatering screen dehydration output screen through an overflow weir, discharging the heavy products out of the jigger through an oversize discharge mode and a through screen discharge mode to enter a tail coal dewatering screen, dehydrating the cleaned coal products and the screen drainage water in the tail coal dewatering screen, respectively feeding the screen drainage water output by the clean coal dewatering screen and the tail coal dewatering screen into a fishing pit, separating the screen drainage water into circulating water and underflow in a precipitation overflow mode by using the fishing pit, feeding the circulating water for a sorting link, and pumping the underflow into a tail coal filter press for filter pressing by using a pump;
c. feeding coal materials with the particle size of less than 3mm from the upper end of a groove body of a TBS separator along a tangent line, performing interference settling motion on the coal materials with the particle size of less than 3mm in the TBS separator, and realizing sorting according to density, wherein low-density-grade light products are discharged from the TBS separator along with overflow and enter a 0.5 mm-size sieve bend for screening, high-density-grade heavy products of the TBS separator enter a tail coal centrifuge after being discharged from a discharge valve at the bottom of the TBS separator, the high-density-grade heavy products are dehydrated by the tail coal centrifuge to obtain tail coal products and centrifuge centrifugate, feeding oversize materials screened by the sieve bend into a clean coal centrifuge for dehydration to obtain end clean coal products and centrifuge centrifugate, and returning the centrifuge centrifugate to the TBS separator for recycling;
d. and (3) feeding the underflow of the fishing pit, the centrifugal liquid of the centrifugal machine of the tail coal centrifugal machine and the undersize product of the sieve bend into a tail coal filter press for filter pressing, dehydrating to obtain a tail coal mud product with the particle size of less than 0.5mm, and recycling the filtrate as circulating water.
The vitrinite group marked sorting density of the TBS sorting machine is less than 1.45g/cm3Density grade, 90% of the mixture, wherein the vitrinite coal content is 57% and is more than 1.45g/cm3The density grade accounts for 10 percent, wherein the vitrinite content is 57 percent.
The proportion of the coal materials with the particle size of more than 3mm after being sorted by the TBS sorting machine is 93%, the content of vitrinite therein is 55%, the proportion of the coal materials with the particle size of less than 3mm is 7%, and the content of vitrinite therein is 30%.
The whole separation process only uses an aqueous medium and does not need to add a medium recovery process.
The tailing coal slurry product with the grain size smaller than 0.5mm is directly used as a tailing coal product without floatation.
Has the advantages that: in the technical scheme of the invention, jigging separation is carried out on +3mm coal after 3mm raw material coal is classified, TBS separation is carried out on-3 mm raw material coal, and the separation density is 1.45g/cm3The vitrinite and inertinite coals are effectively separated, the content of inactive ingredients of the inertinite coal in the coal-to-liquid oil in the clean coal is reduced, and the raw material coal meets the secondary standard of direct liquefaction, namely the content of the inertinite is 15-45%, so that the oil-saving product recovery rate of a subsequent oil ring for coal-to-liquid oil is improved, and the economic benefit is increased for enterprises. According to the process flow, TBS with a good sorting effect on fine particle grades is used for sorting 3-0.5mm raw material coal, jigging sorting has enough sorting precision on +3mm coarse particle grades, and-0.5 mm coal is directly used as tailing coal due to high content of inert components, so that the problem of low enrichment efficiency of the existing process on fine particle grade coal is solved, the clean coal tailing coal can be effectively sorted without adding a medium, flotation links of-0.5 mm are reduced, the process is simple, the operation is convenient, and the investment is small. The low-rank coal prepared from coal oil is classified and sorted, and a better sorting effect can be obtained at 50-3 mm, 3-0.5mm, so that the vitrinite coal content in clean coal is improved, and the low-rank coal prepared from coal oil is classified and sortedEnrichment of vitrinite has clear advantages.
Drawings
FIG. 1 is a block diagram of a sorting process of the present invention.
Fig. 2 is a schematic view of the structure of the sorting apparatus of the present invention.
In the figure: 1-raw coal, 2-lump clean coal product, 3-tail coal product, 4-end clean coal product, 5-tail coal product, 6-tail coal mud product, 7-circulating water, A-classifying screen, B-jigging machine, C-TBS sorter, D-clean coal dewatering screen, E-tail coal dewatering screen, F-fishing pit, G-arc screen, H-clean coal centrifuge, I-tail coal centrifuge, J-tail coal filter press, a-tail coal centrifuge centrifugate, B-clean coal centrifuge centrifugate.
The specific implementation mode is as follows:
the invention will be further described in the following with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, the method for sorting coal-to-oil raw material coal based on aqueous medium sorting according to the present invention comprises the following steps:
a. feeding the raw material coal 1 into a grading sieve A for 3mm grading, thereby obtaining two coal materials with the grain size of more than 3mm and the grain size of less than 3 mm:
b. feeding coal materials with the particle size of more than 3mm into a jigger B for sorting, after layering light and heavy products in the jigger B, feeding the light products into a block clean coal product 2 and screen drainage water on a dehydration output screen of a clean coal dehydration screen D through an overflow weir, discharging the heavy products out of the jigger B through an oversize material discharge mode and a through screen material discharge mode to enter a tail coal dehydration screen E, dehydrating the tail coal product 3 and screen drainage water on the output screen in the tail coal dehydration screen E, respectively feeding the screen drainage water output by the clean coal dehydration screen D and the tail coal dehydration screen E into a fishing pit F, separating the screen drainage water into circulating water 7 and bottom flow by utilizing the fishing pit F in a precipitation overflow mode, feeding the circulating water 7 for a sorting link, and pumping the bottom flow into a tail coal filter press J for filter pressing;
c. feeding coal materials with the particle size of less than 3mm from the upper end of a groove body of the TBS separator C along a tangent line, carrying out interference settling motion on the coal materials with the particle size of less than 3mm in the TBS separator C and realizing separation according to density, wherein low-density-level light products are discharged from the TBS separator C along with overflow and enter a sieve of a sieve bend G with the particle size of 0.5mmDischarging a high-density-level heavy product of the TBS separator C from a discharge valve at the bottom of the TBS separator C, feeding the high-density-level heavy product into a tailing centrifuge I, dehydrating the high-density-level heavy product by the tailing centrifuge I to obtain a tailing product 5 and tailing centrifuge centrifugate a, feeding the oversize material sieved by the sieve bend G into a clean coal centrifuge H, dehydrating the oversize material to obtain a fine clean coal product 4 and clean coal centrifuge centrifugate b, and returning the clean coal centrifuge centrifugate b to the TBS separator C for recycling; the vitrinite group marked sorting density of the TBS sorter C is less than 1.45g/cm3Density grade, accounting for 90%, wherein the vitrinite coal content is 57%, and is more than 1.45g/cm3The density grade accounts for 10 percent, wherein the vitrinite content is 57 percent; the proportion of the coal material with the particle size of more than 3mm after being sorted by the TBS sorter C is 93 percent, the vitrinite content is 55 percent, the proportion of the coal material with the particle size of less than 3mm is 7 percent, and the vitrinite content is 30 percent;
d. and (3) feeding the underflow of the fishing pit F, the tailing centrifugal liquid a of the tailing centrifugal machine I and the undersize product of the sieve bend G into a tailing filter press J for filter pressing, dehydrating to obtain a tailing slurry product 6 with the particle size of less than 0.5mm, recycling the filtrate as circulating water 7, and directly using the tailing slurry product 6 with the particle size of less than 0.5mm as a tailing product without flotation.
The whole separation process only uses an aqueous medium and does not need to add a medium recovery process.
Example (b):
the coal-to-liquid raw material coal sample is taken from a clean coal product of a coal preparation plant for preparing the oil raw material coal from the coal mine of the Shendong group, the active ingredients of the raw material coal are mainly concentrated in a large particle size level, and the density difference of different coal rock components is large, so that the efficient separation can be realized by utilizing a gravity separation method, the separation particle size range of a jigger is wide, the sufficient separation precision is realized, the TBS has a good separation effect on coarse coal slime, and the TBS can be used for separating the coarse coal slime;
according to the lower sorting limit of the jigger and the lower sorting limit of the TBS, 3mm classification can be considered, the proportion of the +3mm size fraction is 93 percent, the content of the active component is 56 percent, the proportion of the-3 mm size fraction is 7 percent, the content of the active component is 30 percent,
sorting Density according to Selectivity CurveApproximately at 1.45g/cm3About-1.45 g/cm3The density level accounts for 8%, the active component content is 30%, +1.45g/cm3The density level accounts for 92 percent, and the content of active ingredients is 57 percent;
comprises a vibrating screen (screen hole 3mm), a jigger, a disturbing bed separator (TBS), a centrifugal dehydrator, a clean coal dewatering screen, a tail coal dewatering screen, a fishing pit, a sieve bend (0.5mm) and a filter press. Firstly, feeding raw material coal 1 into a grading sieve A by using a scraper conveyor for 3mm grading, feeding oversize materials into a feeder, feeding the oversize materials into a jigger B by using the feeder, layering light and heavy products, then feeding the light products into a clean coal dewatering sieve D by using an overflow weir, dewatering the oversize products to obtain block clean coal products 2, and feeding screened water into a fishing pit F; discharging heavy products at the lower layer in an oversize discharge and through-screen discharge mode, feeding the heavy products into a tailing dewatering screen E, dewatering the tailing to be used as a tailing product 3, and feeding screened water into a fishing pit F; taking overflow of the fishing pit F as circulating water 7 for use in a sorting link, and pumping underflow into a tailing filter press J by using a pump;
feeding the-3 mm size fraction raw material coal after classification by the classifying screen A along a tangent line from the upper end of a tank body of the TBS separator C, carrying out interference settling motion on the material in the separator, thereby realizing separation according to density, discharging a low-density grade along with overflow, passing through a 0.5mm sieve bend G, directly taking the oversize material as a final clean coal product 4 after dehydration by a clean coal centrifuge H, returning centrifuge centrifugate into the TBS separator C, and feeding the undersize product of the sieve bend G into a tail coal filter press J; and discharging heavy products of the TBS separator C from a discharge valve at the bottom, dehydrating the heavy products by using a tailing centrifuge I to obtain a tailing product 5, feeding centrifugate of the centrifuge into a tailing filter press J for filter pressing, dehydrating the centrifugate to obtain a tailing mud product 6 with the particle size of-0.5 mm, and using filtrate as circulating water 7.
Claims (5)
1. A separation method for coal-to-liquids feed coal enrichment based on aqueous medium separation is characterized by comprising the following steps:
a. feeding the raw material coal (1) into a grading sieve (A) for 3mm grading, thereby obtaining two coal materials with the grain diameter of more than 3mm and the grain diameter of less than 3 mm:
b. feeding coal materials with the particle size of more than 3mm into a jigger (B) for sorting, after light and heavy products in the jigger (B) are layered, feeding the light products into a block clean coal product (2) and screen drainage water on a dehydration output screen of a clean coal dehydration screen (D) through an overflow weir, discharging the heavy products out of the jigger (B) through an oversize discharge mode and a through screen discharge mode to enter a tail coal dehydration screen (E), dehydrating and outputting an oversize tail coal product (3) and screen drainage water in the tail coal dehydration screen (E), respectively feeding the screen drainage water output by the clean coal dehydration screen (D) and the tail coal dehydration screen (E) into a fishing pit (F), separating the screen drainage water into circulating water (7) and underflow through a precipitation overflow mode by utilizing the fishing pit (F), using the circulating water (7) for a sorting link, and pumping the underflow into a tail coal filter press (J) through a pump;
c. feeding coal materials with the particle size of less than 3mm from the upper end of a groove body of a TBS separator (C) along a tangent line, performing interference settling motion in the TBS separator (C) and realizing separation according to density, wherein the light products of low density grade are discharged from the TBS separator (C) along with overflow and enter a 0.5mm size sieve bend (G) for screening, the heavy products of high density grade of the TBS separator (C) are discharged from a discharge valve at the bottom of the TBS separator (C) and enter a tailing centrifuge (I), the heavy products of high density grade are dehydrated by the tailing centrifuge (I) to obtain a tailing product (5) and a tailing centrifuge centrifugate (a), feeding the oversize material screened by the arc screen (G) into a clean coal centrifuge (H) for dehydration to obtain a fine clean coal product (4) and a clean coal centrifuge centrifugate (b), and returning the clean coal centrifuge centrifugate (b) to the TBS separator (C) for recycling;
d. and (3) feeding underflow of the fishing pit (F), tailing coal centrifuge centrifugate (a) of a tailing coal centrifuge (I) and undersize products of the sieve bend (G) into a tailing coal filter press (J) for filter pressing, dehydrating to obtain tailing coal slurry products (6) with the particle size of less than 0.5mm, and recycling filtrate as circulating water (7).
2. The aqueous medium sorting-based coal-to-oil feedstock coal enrichment sorting method of claim 1, wherein: the vitrinite component marking sorting density of the TBS sorter (C) is less than 1.45g/cm3Density grade, accounting for 90%, wherein the vitrinite coal content is 57%, and is more than 1.45g/cm3The density grade accounts for 10 percent, wherein the vitrinite content is 57 percent.
3. The aqueous medium sorting-based coal-to-oil feedstock coal enrichment sorting method of claim 1, wherein: the proportion of the coal material with the particle size of more than 3mm after being sorted by the TBS sorter (C) is 93 percent, the vitrinite content is 55 percent, the proportion of the coal material with the particle size of less than 3mm is 7 percent, and the vitrinite content is 30 percent.
4. The aqueous medium sorting-based coal-to-oil feedstock coal enrichment sorting method of claim 1, wherein: the whole separation process only uses an aqueous medium and does not need to add a medium recovery process.
5. The aqueous medium sorting-based coal-to-oil feedstock coal enrichment sorting method of claim 1, wherein: the tailing coal slurry product (6) with the grain size smaller than 0.5mm is directly used as a tailing coal product without floatation.
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| CN201910110663.1A CN109746116B (en) | 2019-02-12 | 2019-02-12 | Water medium separation-based coal-to-liquid raw material coal enrichment separation method |
| AU2019429000A AU2019429000B2 (en) | 2019-02-12 | 2019-04-22 | Concentration and separation method for raw coal of coal-to-liquid fuels on the basis of water medium separation |
| PCT/CN2019/083658 WO2020164187A1 (en) | 2019-02-12 | 2019-04-22 | Concentration and separation method for raw coal of coal-to-liquid fuels on the basis of water medium separation |
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| CN113023937B (en) * | 2021-03-05 | 2023-05-09 | 唐山亿思特选煤科技有限公司 | Tail coal slime water treatment device and method for wet coal preparation plant |
| CN113458126A (en) * | 2021-07-30 | 2021-10-01 | 李晓慧 | Solid waste recycling equipment for coal gasification slag |
| CN113731619A (en) * | 2021-08-10 | 2021-12-03 | 新疆宝明矿业有限公司 | Oil shale raw ore sorting system and method |
| CN113908975B (en) * | 2021-09-09 | 2024-01-23 | 华北科技学院(中国煤矿安全技术培训中心) | Dry-wet combined sorting method for power coal |
| CN114226061A (en) * | 2021-12-24 | 2022-03-25 | 河南天成能源科技有限公司 | Mixed separation process of raw coal, middlings and coal slime below 3mm |
| CN114700169A (en) * | 2022-01-17 | 2022-07-05 | 淮北矿业股份有限公司 | Separation process suitable for treating fine-grain hard-dressing coking coal with high middling coal content |
| CN115445320A (en) * | 2022-08-31 | 2022-12-09 | 晋能控股装备制造集团有限公司寺河煤矿 | Mine water underground treatment process |
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| WO2020164187A1 (en) | 2020-08-20 |
| AU2019429000B2 (en) | 2021-11-25 |
| AU2019429000A1 (en) | 2020-11-19 |
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