CN109365141B - Coal slime flotation process with recycling flotation agent - Google Patents
Coal slime flotation process with recycling flotation agent Download PDFInfo
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- CN109365141B CN109365141B CN201811431154.0A CN201811431154A CN109365141B CN 109365141 B CN109365141 B CN 109365141B CN 201811431154 A CN201811431154 A CN 201811431154A CN 109365141 B CN109365141 B CN 109365141B
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/12—Agent recovery
Abstract
The invention provides a coal slime flotation process for recycling flotation reagents, which mainly comprises coal slime flotation equipment, a filter press, an air flotation device, a flotation reagent barrel and the like. The method mainly comprises the following steps: the flotation clean coal enters a flotation clean coal barrel through a collecting chute; the material of the flotation clean coal after being dehydrated by a filter press becomes a final clean coal product, and the filtrate enters an air flotation device; transferring upper-layer foam of the air flotation device and then feeding the upper-layer foam into a flotation feeding size mixing device; and (4) residual filtrate of the air floatation device enters a circulating water tank. The method has the characteristics that the flotation reagents distributed in the flotation clean coal filtrate are enriched and recovered by utilizing the micro bubbles and returned to the flotation system for recycling, the process is simple and feasible, the adaptability is strong, the reagent consumption in the coal slime flotation process can be effectively reduced by adopting the process, the flotation reagent consumption can be saved by more than 10 percent, the content of residual micro coal slime in the circulating water can be reduced, and the quality of the circulating water is improved.
Description
Technical Field
The invention belongs to the field of flotation coal separation, relates to a reagent recycling process in a flotation coal separation process, and particularly relates to a coal slime flotation process based on flotation reagent recycling.
Background
Flotation is the most effective, most economical and most mature method of coal slime with the size of-0.5 mm, the yield of fine coal slime is further improved along with the improvement of the fully-mechanized mining degree of coal and the deterioration of coal quality in the future, and the importance of flotation is certainly further highlighted.
The flotation reagent is a key factor for improving the floatability of the combustible body and adjusting the stability of bubbles. But the consumption of the flotation reagent obviously increases the flotation operation cost on one hand, and the current flotation cost is more than 3 times of that of the gravity separation operation, wherein the flotation reagent is mainly caused by the consumption of the reagent. On the other hand, the method also produces certain pollution to the water body of the coal preparation plant, so that the reduction of the consumption of the flotation reagent is beneficial to increasing the economic benefit of enterprises and relieving the water body pollution caused by the reduction of the consumption of the flotation reagent.
The research of reducing the chemical consumption in the existing coal slime flotation mainly focuses on the front flotation stage, namely, the flotation agent consumption is reduced mainly by adding chemicals in a segmented mode, forcibly and intensively mixing slurry and developing a novel efficient agent. However, a large amount of collecting agents and foaming agents which are remained and dissolved in the water body after the clean coal and the tailings are floated and separated in the later stage of the flotation are not recycled in a centralized way. Although the water body of the coal preparation plant is in a dynamic large circulation, the water body does not achieve the purpose of special water.
In actual production, some coal preparation plants return flotation clean coal filter pressing filtrate to a flotation feeding link, and indirectly utilize residual flotation reagents in the filtrate, but because the flow rate of the filtrate is large, the concentration of the flotation feeding is easily reduced, and the flotation effect is deteriorated.
In summary, the residual flotation reagent in the filtrate after the flotation is recycled can further reduce the consumption of the flotation reagent, but the residual flotation reagent needs to be preferentially enriched so as to avoid adverse effects on the flotation link.
Disclosure of Invention
Aiming at the problem that the flotation reagent remained in the water body after the flotation is finished is difficult to be directly utilized. The invention provides a treatment process for performing air flotation enrichment and recycling on filtrate obtained after filter pressing of flotation clean coal by utilizing the surface activity of a flotation reagent, and provides a coal slime flotation process for recycling the flotation reagent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coal slime flotation process for recycling flotation reagents comprises the following steps:
step 1: adding a flotation reagent into the flotation feed, uniformly mixing and feeding the mixture into a flotation machine;
step 2: dewatering the flotation clean coal by a filter press, doping the dewatered solid into the final clean coal, and feeding the filtrate into an air flotation device;
and step 3: and separating circulating water and upper-layer flotation reagent foam by using the air flotation device, returning the reagent foam as a flotation reagent to a flotation feeding link, and feeding the circulating water into a circulating water pool.
Preferably, the air floatation device is a pressurized dissolved air floatation device and generates 20-100 mu m micro-bubbles.
Preferably, the effective retention time of the filter press filtrate in the air floatation device is more than 5 min.
Preferably, the aeration quantity of the air floatation device is more than 0.5m3/min·m2。
Preferably, the agent foam of the air floatation device returns to the flotation feeding link, the return point can be flexibly adjusted according to the process, and the agent foam can be used as a size mixing device, a flotation feeding barrel/tank and a flotation feeding pipeline.
Preferably, after the flotation clean coal is dehydrated by a filter press, the filtrate automatically flows into the air flotation device.
Has the advantages that: the flotation agent remained in the flotation clean coal filtrate in the coal slime flotation process is subjected to air flotation enrichment and recycled, so that the agent consumption in the flotation process is reduced; the content of residual fine coal slime in the circulating water is reduced, and the quality of the circulating water is improved; and the recovery process is flexible, strong in adaptability, free of special operation and easy to implement in conjunction with the existing process.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
reference numbers in the figures: a-a flotation machine; b, flotation of a refined coal barrel; c-clean coal filter press; d-a filtrate barrel; e-an air flotation device; k-flotation reagent barrel; l-size mixing equipment; m-circulating water pool.
FIG. 2 is an application process flow of a certain coking coal preparation plant;
FIG. 3 is the process flow of the process applied to a certain coking coal preparation plant.
Detailed Description
In order to make the technical method of the invention easily understood, the technical scheme of the invention is described by using specific examples with reference to the attached drawings. It should be noted that the embodiments described herein are only some embodiments of the present invention, and not all implementations of the present invention, and the purpose of the embodiments is only to provide the examiner and the public with a more intuitive and clear understanding of the present invention, and not to limit the technical solutions of the present invention. All other embodiments, as well as other simple substitutions and various changes to the technical solutions of the present invention, which can be made by those skilled in the art without inventive work, are within the scope of the present invention without departing from the spirit of the present invention.
As shown in fig. 1, the present invention mainly comprises the following steps:
adding a fresh flotation reagent (K-flotation reagent barrel) into the flotation feed, uniformly mixing the mixture by a pulp mixing device L, and feeding the mixture into a flotation machine A;
the flotation machine A sorts out tail coal and clean coal, and the clean coal is collected by a chute and enters a clean coal flotation bucket B;
feeding the flotation clean coal pulp into a clean coal filter press C, doping the solid into a final clean coal product, and feeding filtrate water into a filtrate barrel D;
the filtrate water enters an air floating device E, circulating water and upper-layer flotation reagent foam are separated through air floating operation, the reagent foam enters size mixing equipment L, and the circulating water enters a circulating water pool M;
FIG. 2 shows the process flow of coal preparation plant using certain coking coal
The coal preparation plant is a 3.0Mt/a coking coal preparation plant, the raw material coal is 1/3 coking coal, and the amount of the flotation feed slurry is about 600m3The addition amount of diesel oil serving as a collecting agent in the normal flotation process is 900g/t of raw coal, and the consumption amount of 2# oil serving as a foaming agent is 90g/t of raw coal;
the flotation feed and flotation reagent are mixed by 2 XK-500 ore pulp preparers and then fed into 2 4-tank XJM-12 flotation machines;
feeding the flotation clean coal into a 2 KXGZ650/200-U type filter press after the flotation clean coal enters a flotation clean coal barrel, and mixing the flotation clean coal into a final product after dehydration;
the filtrate of the filter press returns to the circulating water pool.
FIG. 3 is a process flow of the process applied to a certain coking coal preparation plant
In the scheme of the invention, only 2 GSF-45 combined air flotation tanks are additionally arranged to process the filtrate suspension, the size of each tank is 6000mm multiplied by 2700mm multiplied by 2100mm, and the processing amount is 34m3H, the effective retention time of the filtrate is 6min, and the aeration quantity is 0.6m3/min·m2；
The flotation clean coal filtrate flows to the combined air flotation tank automatically, the residual flotation agent therein floats to the surface of the air flotation tank after acting with air bubbles, and returns to 2 XK-500 ore pulp preparers for pulp mixing after being collected for recycling;
and returning the residual filtrate in the air floatation tank to the circulating water tank.
After the process is adopted, the actual measurement of the medicament consumption of the coal preparation plant is that the addition amount of the collecting agent diesel oil is 800g/t of raw coal, and the consumption amount of the foaming agent No. 2 oil is 50g/t of raw coal; the whole flotation agent consumption is reduced by more than 14%. The flotation reagent is saved by about 420 tons every year, and the production cost is saved by about 210 ten thousand yuan every year.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A coal slime flotation process for recycling flotation reagents is characterized by comprising the following steps:
step 1: adding a flotation reagent into the flotation feed, uniformly mixing and feeding the mixture into a flotation machine;
step 2: dewatering the flotation clean coal by a filter press, doping the dewatered solid into the final clean coal, and feeding the filtrate into an air flotation device;
and step 3: separating circulating water and upper-layer flotation reagent foam by using the air flotation device, returning the reagent foam as a flotation reagent to a flotation feeding link, and feeding the circulating water into a circulating water pool;
the air floatation device is a pressurized dissolved air floatation device and generates micro bubbles of 20-100 mu m; the effective retention time of the filter liquor of the filter press in the air floatation device is more than 5 min.
2. The coal slime flotation process for recycling flotation agents as claimed in claim 1, wherein the aeration amount of the air flotation device is more than 0.5m3/min·m2。
3. The coal slime flotation process for recycling flotation agents as claimed in claim 1, wherein the agent froth of the air flotation device is returned to the flotation feeding link, the return point can be flexibly adjusted according to the process, and the agent froth can be a size mixing device, a flotation feeding barrel/tank and a flotation feeding pipeline.
4. The coal slime flotation process for recycling the flotation reagent according to claim 1, wherein the filtrate automatically flows into the air flotation device after the flotation clean coal is dehydrated by a filter press.
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| CN112371343A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Flotation clean coal dewatering and blending process |
| CN112225431B (en) * | 2020-10-28 | 2022-11-01 | 昭仕（厦门）新材料有限公司 | Coal slime treatment method and coal slime treatment composite preparation |
| CN112536159A (en) * | 2020-11-20 | 2021-03-23 | 四川广旺能源发展（集团）有限责任公司唐家河煤矿 | Flotation tailing coal slime secondary concentration recovery process |
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