CN115608518A - Carbon ash separation method for coal gasification fine slag - Google Patents

Carbon ash separation method for coal gasification fine slag Download PDF

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CN115608518A
CN115608518A CN202211282931.6A CN202211282931A CN115608518A CN 115608518 A CN115608518 A CN 115608518A CN 202211282931 A CN202211282931 A CN 202211282931A CN 115608518 A CN115608518 A CN 115608518A
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fine slag
coal gasification
carbon
flotation
gasification fine
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Inventor
郭庆华
任亮
于广锁
龚岩
王辅臣
刘海峰
王亦飞
陈雪莉
代正华
李伟锋
许建良
梁钦锋
王兴军
郭晓镭
陆海峰
赵辉
丁路
沈中杰
高云飞
刘霞
赵丽丽
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East China University of Science and Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents
    • B03D1/004Organic compounds
    • B03D1/006Hydrocarbons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage

Abstract

The invention provides a carbon ash separation method for coal gasification fine slag. Which comprises the following steps: s1: performing ultrasonic treatment on the slurry of the coal gasification fine slag for less than 20 min; s2: uniformly mixing the slurry obtained in the step S1 with a composite collecting agent and a foaming agent, and introducing air, wherein a flotation foam layer is a carbon-rich component, and residues are tailing components; wherein the composite collector comprises a non-polar collector and a polar collector; the non-polar collector comprises one or more of diesel oil, gasoline, kerosene, natural gas condensed oil and non-polar hydrocarbon oil; the polar collector comprises one or more of biodiesel, nonionic surfactant, oleic acid, waste engine oil and fatty acid substances; s3: and (3) stirring the carbon-rich component obtained in the step (S2) and introducing air, wherein the flotation foam layer is the carbon-rich component, and the residue is the tailings component. The method is simple to operate, and by coupling ultrasonic pretreatment and the composite collecting agent, the surface hydrophobicity of unburned carbon can be effectively improved, the quality of a flotation product is improved, and the flotation separation effect is enhanced.

Description

Carbon ash separation method for coal gasification fine slag
Technical Field
The invention relates to the technical field of entrained flow bed coal gasification fine slag treatment, and relates to a carbon ash separation method of coal gasification fine slag.
Background
With the rapid development of the coal chemical industry in China, the coal gasification fine slag is used as a byproduct of the entrained flow coal gasification technology, and the yield of the coal gasification fine slag is increased year by year. Because the coal gasification fine slag has the characteristics of strong water absorption, large particle size distribution span and high ignition loss, the coal gasification fine slag is difficult to directly recycle. The coal gasification fine slag with huge yield is mainly used as solid waste for landfill treatment, not only occupies a large amount of land resources, but also toxic and harmful percolate can cause serious pollution to soil and water. Therefore, the large-scale and resource utilization of the coal gasification fine slag becomes a difficult point and a key problem in the treatment of the coal gasification slag of coal gasification enterprises.
The carbon ash separation of the coal gasification fine slag is a precondition for realizing the resource utilization. The current methods for separating carbon residue from coal gasification fine slag mainly comprise particle size screening, gravity separation, froth flotation and oil agglomeration, wherein the froth flotation is considered to be the best mode for separating coal gasification fine slag carbon residue and ash particles due to low economic cost, high flotation efficiency and simple operation. However, the complex way of existence of ash particles in the coal gasification fine slag and the poor surface hydrophobicity of the residual carbon make it difficult for the conventional flotation to achieve a satisfactory separation effect.
In coal gasification fine slag, ash is mainly adhered to the surface of residual carbon or embedded in the pore canal of the residual carbon except for part of ash existing in the form of single particles, and the ash particles are easy to enter a flotation fine carbon component in a mechanical entrainment mode in a conventional flotation process, so that the quality of the fine carbon is reduced. Furthermore, the difference in hydrophobicity of the target mineral from the ash is critical for successful flotation. After the coal gasification fine slag is subjected to a high-temperature gasification process, some oxygen-containing groups, such as carbonyl groups, are inevitably formed on the surface of a carbon residue substrate, so that a traditional non-polar collecting agent cannot be uniformly spread on the surface of carbon oxide, the adsorption efficiency of the non-polar hydrocarbon collecting agent is reduced and the using amount of the non-polar hydrocarbon collecting agent is increased in the conventional flotation process of the coal gasification fine slag, and the cost of the flotation process is obviously increased.
Therefore, in view of the above problems, how to enhance the flotation process of the coal gasification fine slag has become a key problem limiting the efficient utilization thereof. In order to solve the problems, in the prior art, on one hand, a flocculant and a degradation agent are adopted for pretreatment, a large amount of chemical reagents are consumed, and potential environmental risks exist; on the other hand, the scavenging is adopted to refine the obtained roughing product, and the required equipment and the process flow are complex.
Disclosure of Invention
In order to solve the problems in the conventional flotation process of the coal gasification fine slag, the invention provides a carbon-ash separation method of the coal gasification fine slag, which fully considers the structural characteristics and the composition characteristics of the coal gasification fine slag, remarkably reduces the ash content entrainment in the flotation process of the coal gasification fine slag, promotes the spreading of a collecting agent on the surface of the fine slag oxidized carbon, reduces the using amount of a chemical reagent in the flotation process, simplifies the process, strengthens the flotation process of the coal gasification fine slag and reduces the cost by the coupling process of ultrasonic pretreatment fine slag slurry and a composite collecting agent.
The inventor finds out through long-term research that: the combination mode of the coal gasification fine slag carbon residue and inorganic minerals is complex, most of the carbon residue and the inorganic minerals are embedded or wrapped with each other, and the conventional froth flotation shows poor separation efficiency on the coal gasification fine slag. In the specially arranged ultrasonic treatment process, the high-speed shock waves and the microjets formed by the rupture or implosion of the cavitation bubbles promote mineral particles to fall off from the surface of the residual carbon, so that the quality of fine slag flotation products is obviously improved. The invention provides a coupling flotation strengthening process of ultrasonic wave and composite collecting agent treatment on the basis of conventional flotation. Different molecules in the composite collector can be directionally adsorbed in different areas of the fine slag carbon residue to uniformly cover the surface of the carbon residue, so that the surface hydrophobicity difference between the gasified fine slag carbon residue and the inorganic mineral is remarkably increased. The embodiment proves that the method has remarkable strengthening effect on the froth flotation process of the coal gasification fine slag.
The invention provides a flotation method for strengthening the coal gasification fine slag carbon ash separation process, which comprises the following steps:
s1: performing ultrasonic treatment on the slurry of the coal gasification fine slag;
wherein the ultrasonic time is less than 20 min;
s2: uniformly mixing the slurry of the coal gasification fine slag obtained in the step S1 with a composite collecting agent and a foaming agent, and then introducing air, wherein a foam layer obtained by flotation is a carbon-rich component, and the obtained residue is a tailing component;
wherein the composite collector comprises a non-polar collector and a polar collector;
wherein the non-polar collector comprises one or more of diesel oil, gasoline, kerosene, natural gas condensed oil and non-polar hydrocarbon oil;
wherein the polar collector comprises one or more of biodiesel, nonionic surfactant, oleic acid, waste engine oil and fatty acid substances;
s3: and (3) stirring the carbon-rich component obtained in the step (S2) and introducing air, wherein the foam layer obtained by flotation is the carbon-rich component, and the obtained residue is the tailings component.
In S1, the method for preparing the slurry of coal gasification fine slag is preferably: directly sampling from the bottom of the black water settling tank, and uniformly mixing by using mechanical stirring equipment.
Wherein the mechanical stirring device is conventional in the art, such as a mechanical stirrer.
Wherein the stirring speed of the mechanical stirrer is preferably 1000-2000rpm.
Wherein the stirring time of the mechanical stirrer is preferably 2-5min.
In S1, the ultrasound equipment is conventional in the art.
Wherein the output power of the ultrasound is preferably 500-800W.
Wherein, the time of ultrasonic treatment is preferably 5-20min.
In S2, the polar collector in the composite collector preferably accounts for 10-50wt.%.
Wherein wt.% is mass percent.
In S2, the dosage of the composite collector is preferably 1.5-10.5kg/t.
Wherein kg/t refers to the dosage of the composite collector added to each ton of slurry of the coal gasification fine slag.
In S2, the foaming agent is a conventional foaming agent in the field, and preferably one or more of sec-octanol, pine alcohol oil, octanol, mixed alcohol and fusel oil.
In S2, the amount of the foaming agent is preferably 0.5 to 5.5kg/t.
Wherein kg/t refers to the amount of foaming agent added per ton of slurry of the coal gasification fine slag.
In S2, the non-polar collector in the composite collector is preferably 0# diesel oil.
In S2, the polar collector in the composite collector is preferably biodiesel.
In S2, the blowing agent is preferably secondary octanol.
In S3, the carbon ash separation method comprises the following steps: the flotation of the carbon-rich component in S2 is preferably repeated at least once.
In S3, the carbon ash separation method comprises the following steps: more preferably, the flotation of the carbon-rich component in S2 is repeated 2 times.
In S1, the coal gasification fine slag is enriched in the gasification black water, and the solid content is generally 6-12wt.%. At present, the drying and dehydration of the gasified fine slag generate huge energy consumption and economic cost. The invention selects the gasified black water with the solid content of 6-12wt.% for flotation, aims to omit the drying and dehydration stage of the gasified fine slag and simplify the treatment process of the gasified fine slag. Similar promoting effects are also obtained for fine slag slurries with solids contents of less than 6wt.% or more than 12wt.%, according to flotation theory and the strengthening mechanism of the present invention.
In S1, the ultrasonic pretreatment time of different coal gasification fine slag slurries differs to a certain extent, the ultrasonic pretreatment time mainly depends on the combination complexity of residual carbon and inorganic minerals in the coal gasification fine slag, the flotation effect of the fine slag slurries after ultrasonic treatment and treatment at different times is determined according to the flotation effect, the ash content of the two kinds of fine slag flotation fine carbon is gradually reduced along with the increase of the ultrasonic pretreatment time of the fine slag slurries, the increase of the ultrasonic pretreatment time is helpful for improving the quality of flotation products, the coal gasification fine slag is excessively crushed due to the overlong ultrasonic time, and more small-particle-size mineral particles enter the fine carbon products under the mechanical entrainment effect.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
(1) The ultrasonic oscillation adopted by the invention is a mild crushing mode, and effectively avoids further refinement of the grain size of the fine slag caused by excessive crushing. In addition, the cavitation generated by the ultrasonic wave in the liquid environment is helpful to strip the fine particles with higher surface oxidation degree of the fine slag carbon residue, and the surface hydrophobicity of the unburned carbon of the coal gasification fine slag can be improved.
(2) The composite collecting agent is used for replacing the traditional nonpolar oil collecting agent, so that the using amount of a fine slag flotation agent can be reduced, the porous characteristic of the gasified fine slag is fully utilized, the flotation agent adsorbed by the roughly-selected carbon-rich component is recycled in the concentration process, the consumption of the flotation agent is not increased, the using amount of a chemical agent is lower, the process cost can be effectively reduced, and the using efficiency of the collecting agent can be enhanced.
(3) The invention adopts the coupling of ultrasonic waves and the composite collecting agent, only needs to increase auxiliary equipment for ultrasonic treatment of fine slag slurry, has simple process, stronger operability, low cost and environmental protection.
(4) The invention can directly sample from the bottom of the black water settling tank and perform flotation, omits the drying and dehydration link of coal gasification fine slag and has obvious cost advantage.
Drawings
FIG. 1 is a schematic diagram of the enhanced flotation process for the coal gasification fine slag carbon ash separation process of examples 1 and 2.
Fig. 2 is a comparison of flotation results of the coal gasification fine slag slurry used in example 1 and example 2 at different sonication times, wherein the sonication time "0" indicates conventional flotation results.
Fig. 3 is a graph showing the influence of the composition of the composite collector used in examples 1 and 2 on the flotation efficiency of coal gasification fine slag, wherein a ratio of 0 indicates that the ratio of biodiesel in the composite collector is 0.
Figure 4 is a graph showing the effect of flotation stage number on fine carbon ash content for examples 1 and 2.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
In the following examples and comparative examples:
the flotation equipment is selected from: the model of the single-groove mechanical stirring type flotation machine is XFDIII-0.5L.
The fine slag slurry 1 is prepared from the following sources: directly sampling from the bottom of a black water settling tank of an industrial entrained flow coal gasification enterprise A, wherein the solid content of coal gasification fine slag slurry is about 8wt.%, and the loss on ignition of the gasification fine slag is about 15.6wt.%; the sources of the fine slag slurry 2 are as follows: directly sampling from the bottom of a black water settling tank of an industrial entrained flow coal gasification enterprise B, wherein the solid content of coal gasification fine slag slurry is about 9wt.%, and the loss on ignition of the gasification fine slag is about 23.6wt.%.
The basic parameters of the biodiesel in the composite collector are shown in the table 1.
TABLE 1 basic characteristic parameters of biodiesel
Figure BDA0003898817590000051
Figure BDA0003898817590000061
Example 1
The invention provides a flotation method for reinforcing the coal gasification fine slag carbon ash separation process, which comprises the following steps as shown in figure 1:
s1: and stirring the fine slag slurry 1 by using a mechanical stirrer to uniformly mix the fine slag slurry, wherein the mechanical stirring speed is 1800rpm, and the stirring time is 3min. Then, carrying out ultrasonic oscillation on the fine slag slurry by using ultrasonic waves, wherein the output power of the ultrasonic waves is 600W, and the ultrasonic time is 15min;
s2: respectively adding a composite collecting agent and a foaming agent into the fine residue slurry obtained in the step S1, wherein the composite collecting agent comprises diesel oil and biodiesel, the ratio of the biodiesel in the composite collecting agent is 20wt.%, the consumption of the composite collecting agent is 9.5kg/t, the consumption of the foaming agent sec-octanol is 0.5kg/t, air is introduced after uniform stirring, a foam layer obtained by flotation is a carbon-rich component, and the obtained residue is a tailing component;
s3: mechanically stirring the carbon-rich component obtained in the step S2 and introducing air, wherein a foam layer obtained by flotation is the carbon-rich component, the obtained residue is a tailing component, and the selection is repeatedly carried out twice;
in this example, the yield of the flotation fine carbon was 18.5%, the ash content of the fine carbon was 30.8wt.%, and the loss on ignition of the tailings was 6.2wt.%.
Example 2
The invention provides a flotation method for strengthening the coal gasification fine slag carbon ash separation process, which comprises the following steps as shown in figure 1:
s1: stirring the fine slag slurry 2 by using a mechanical stirrer to uniformly mix the fine slag slurry, wherein the mechanical stirring speed is 1800rpm, and the stirring time is 3min. Then, carrying out ultrasonic oscillation on the fine slag slurry by using ultrasonic waves, wherein the output power of the ultrasonic waves is 600W, and the ultrasonic time is 15min;
s2: respectively adding a composite collecting agent and a foaming agent into the fine residue slurry obtained in the step S1, wherein the composite collecting agent comprises diesel oil and biodiesel, the biodiesel in the composite collecting agent accounts for 10wt.%, the using amount of the composite collecting agent is 7.5kg/t, the using amount of the foaming agent is 0.5kg/t, air is introduced after uniform stirring, a foam layer obtained by flotation is a carbon-rich component, and the obtained residue is a tailing component;
s3: mechanically stirring the carbon-rich component obtained in the step S2 and introducing air, wherein a foam layer obtained by flotation is the carbon-rich component, the obtained residue is a tailing component, and the selection is repeatedly carried out twice;
in this example, the yield of the flotation fine carbon was 24.7%, the ash content of the fine carbon was 17.6wt.%, and the loss on ignition of the tailings was 5.1wt.%.
Comparative example 1
The flotation method for the conventional coal gasification fine slag carbon ash separation process comprises the following steps:
s1: stirring the fine slag slurry 1 by using a mechanical stirrer, so that the fine slag slurry is uniformly mixed, wherein the mechanical stirring speed is 1800rpm, and the stirring time is 3min;
s2: respectively adding a collecting agent and a foaming agent into the fine residue slurry obtained in the step S1, wherein the collecting agent is diesel oil, the using amount of the collecting agent is 9.5kg/t, the foaming agent is sec-octanol, the using amount of the foaming agent is 0.5kg/t, air is introduced after the stirring is uniform, a foam layer obtained by the flotation is a carbon-rich component, and the obtained residue is a tailing component;
s3: mechanically stirring the carbon-rich component obtained in the step S2 and introducing air, wherein a foam layer obtained by flotation is the carbon-rich component, the obtained residue is a tailing component, and the selection is repeatedly carried out twice;
in this comparative example, the yield of the flotation fine carbon was 23.8%, the ash content of the fine carbon was 61.9wt.%, and the loss on ignition of the tailings was 11.8wt.%.
Comparative example 2
The flotation method for the conventional coal gasification fine slag carbon ash separation process comprises the following steps:
s1: stirring the fine slag slurry 2 by using a mechanical stirrer to uniformly mix the fine slag slurry, wherein the mechanical stirring speed is 1800rpm, and the stirring time is 3min;
s2: respectively adding a collecting agent and a foaming agent into the fine residue slurry obtained in the step S1, wherein the collecting agent is diesel oil, the using amount of the collecting agent is 7.5kg/t, the foaming agent is sec-octanol, the using amount of the foaming agent is 0.5kg/t, air is introduced after the stirring is uniform, a foam layer obtained by the flotation is a carbon-rich component, and the obtained residue is a tailing component;
s3: mechanically stirring the carbon-rich component obtained in the step S2 and introducing air, wherein a foam layer obtained by flotation is the carbon-rich component, the obtained residue is a tailing component, and the selection is repeatedly carried out twice;
in this example, the yield of the flotation refined carbon was 29.5%, the ash content of the refined carbon was 48.1wt.%, and the loss on ignition of the tailings was 14.5wt.%.
For a coal gasification fine slag slurry sample with the same solid content and the same loss on ignition of gasified fine slag, under the mechanical stirring treatment with the same rotating speed and time, the same amount of sec-octanol is added as a foaming agent, a composite collecting agent is adopted in the embodiment 1, compared with the comparative example 1 adopting a conventional collecting agent, the ash content and the loss on ignition of the tailings of the obtained refined carbon are lower, the quality of the obtained refined carbon and the tailings is obviously improved, and the diversified utilization of the refined carbon and the tailings is facilitated.
For the coal gasification fine slag slurry sample with the same solid content and the same gasification fine slag loss on ignition, under the mechanical stirring treatment with the same rotating speed and time, the same amount of sec-octanol is added as a foaming agent, and the composite collecting agent is adopted in the embodiment 2, compared with the comparative example 2 adopting the conventional collecting agent, the ash content and the tailing loss on ignition of the obtained refined carbon are lower, the quality of the obtained refined carbon and the tailing is obviously improved, and the diversified utilization of the refined carbon and the tailing is facilitated.
Effect example 1 Effect of ultrasonic time on flotation Effect
FIG. 2 is a comparison of flotation results of two coal gasified fine slag slurries at different sonication times, wherein a sonication time of "0" is indicative of conventional flotation results. It can be seen that the content of refined carbon ash obtained by refloating the fine slag slurry after ultrasonic pretreatment is significantly reduced compared to conventional flotation. With the prolonging of the time of the ultrasonic pretreatment of the fine slag pulp, the ash content of the flotation refined carbon of the two kinds of fine slag pulp is further reduced. When the ultrasonic time is 15min, the flotation fine carbon ash content of the two fine slag slurries is respectively reduced from 61.9 percent and 48.1 percent of the conventional flotation to 41.9 percent and 31.9 percent. A flocculating agent and a pH buffering agent are required to be added into the D1, and a large amount of chemical agents are consumed and potential environmental risks exist in the process of long-term operation; the process design of the invention is simpler, only ultrasonic auxiliary equipment is needed to be added, long-term investment is not needed, the equipment cost is lower, the method is environment-friendly, and the method has stronger operability for strengthening the fine slag flotation process.
Effect example 2 Effect of composition of composite collector on flotation Effect
Fig. 3 is a graph of the effect of composite collector composition on the flotation efficiency of coal gasification fine slag. In the embodiment, the composite collector consists of 0# diesel oil and biodiesel oil, wherein the ratio of 0 means that the ratio of the biodiesel oil in the composite collector is 0, namely the collector is a traditional non-polar collector (diesel oil). The use of the composite collecting agent further reduces the content of flotation fine carbon ash of the two types of fine slag pulp. When the proportion of the biodiesel in the composite collector is 10wt%, the ash content of the flotation refined carbon of the two fine slag slurries is respectively reduced to 33.9% and 17.6%. Therefore, data comparison can show that compared with a single traditional nonpolar collector, the composite collector consisting of biodiesel and 0# diesel oil is used for coal gasification fine slag flotation, the composite collector has lower content of fine carbon ash, and shows that the composite collector has a better effect on fine slag flotation.
Effect example 3 Effect of flotation stages on flotation Effect
The flotation stages in the process of the invention can be adjusted as shown in figure 4, with the ash content of the refined carbon decreasing progressively as the flotation stages increase. When the two-stage flotation process of two-stage flotation is adopted, the ash content reduction range of the gasified fine slag slurry flotation refined carbon is most obvious. Therefore, under the condition of simplifying the flotation process, the effective enrichment of the fine residue carbon residue can be realized by the secondary flotation process of twice flotation.
The present invention is not limited to the above embodiments and any variations in the combination of process units or dosage of agents are within the scope of the invention. The scope of the present invention is defined by the appended claims, and those skilled in the art can make various changes or modifications to the embodiments without departing from the principle and spirit of the present invention, and such changes and modifications fall within the scope of the present invention.

Claims (10)

1. A carbon ash separation method for coal gasification fine slag is characterized by comprising the following steps:
s1: performing ultrasonic treatment on the slurry of the coal gasification fine slag;
wherein the ultrasonic time is less than 20 min;
s2: uniformly mixing the slurry of the coal gasification fine slag obtained in the step S1 with a composite collecting agent and a foaming agent, and then introducing air, wherein a foam layer obtained by flotation is a carbon-rich component, and the obtained residue is a tailing component;
wherein the composite collector comprises a non-polar collector and a polar collector;
wherein the non-polar collector comprises one or more of diesel oil, gasoline, kerosene, natural gas condensate oil and non-polar hydrocarbon oil;
wherein the polar collector comprises one or more of biodiesel, nonionic surfactant, oleic acid, waste engine oil and fatty acid substances;
s3: and (3) stirring the carbon-rich component obtained in the step (S2) and introducing air, wherein the foam layer obtained by flotation is the carbon-rich component, and the obtained residue is the tailings component.
2. The method for separating carbon dust from coal gasification fine slag according to claim 1, wherein the method for preparing the slurry of coal gasification fine slag in S1 comprises: directly sampling from the bottom of the black water settling tank, and uniformly mixing by using a mechanical stirrer;
wherein the solid content of the slurry of the coal gasification fine slag is preferably 6-12wt.%, for example 8wt.% and 9wt.%;
wherein the rotating speed of the mechanical stirrer is 1000-2000rpm;
wherein the treatment time of the mechanical stirrer is 2-5min, for example 3min.
3. The method for separating carbon ash from coal gasification fine slag according to claim 1, wherein in S1, the output power of the ultrasonic wave is 500-800W;
and/or the treatment time of the ultrasound is 5-20min, for example 15min.
4. The method for separating the carbon ash from the coal gasification fine slag according to claim 1, wherein in S2, the polar collector in the composite collector accounts for 10-50wt.%, wherein wt.% is mass percent;
and/or the dosage of the composite collector is 1.5-10.5kg/t, wherein kg/t refers to the dosage of the composite collector added per ton of slurry of coal gasification fine slag.
5. The method for separating carbon dust from coal gasification fine slag according to claim 1, wherein in S2, the foaming agent is one or more of sec-octanol, pine oil, octanol, mixed alcohol and fusel oil.
6. The method for separating carbon dust from coal gasification fine slag according to claim 1, wherein the amount of the foaming agent used in S2 is 0.5 to 5.5kg/t, wherein kg/t is the amount of the foaming agent added per ton of the slurry of coal gasification fine slag.
7. The method for separating the carbon dust from the coal gasification fine slag according to claim 1, wherein in S2, the non-polar collector in the composite collector is 0# diesel oil;
and/or the polar collector in the composite collector is biodiesel.
8. The method for separating carbon dust from coal gasification fine slag according to claim 1, wherein in S2, the foaming agent is sec-octanol;
and/or the composite collecting agent and the foaming agent used in the flotation are recycled.
9. The method for separating carbon dust from coal gasification fine slag according to claim 1, comprising: repeating the flotation of the carbon-rich component in S2 at least once.
10. The method for separating carbon dust from coal gasification fine slag according to claim 1, comprising: the flotation of the carbon-rich fraction in S2 was repeated 2 times.
CN202211282931.6A 2022-10-19 2022-10-19 Carbon ash separation method for coal gasification fine slag Pending CN115608518A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116851408A (en) * 2023-07-31 2023-10-10 碳达(深圳)新材料技术有限责任公司 Gas slag treatment device and method
CN117299375A (en) * 2023-10-24 2023-12-29 西安科技大学 Device and method for sorting coal gasification fine slag by ultrasonic cavitation and oil agglomeration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116851408A (en) * 2023-07-31 2023-10-10 碳达(深圳)新材料技术有限责任公司 Gas slag treatment device and method
CN117299375A (en) * 2023-10-24 2023-12-29 西安科技大学 Device and method for sorting coal gasification fine slag by ultrasonic cavitation and oil agglomeration
CN117299375B (en) * 2023-10-24 2024-03-08 西安科技大学 Device and method for sorting coal gasification fine slag by ultrasonic cavitation and oil agglomeration

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