Coal-based gasification slag carbon residue backflow and cyclic check extraction system and process

Abstract

The invention discloses a coal-based gasified slag carbon residue backflow and circulating check extraction system and process, and relates to the technical field of coal chemical industry, the system comprises a circulating water pool, a water soaking machine, a water separation pool, a particle size sorting machine, a sedimentation grader, a desliming screen, a spiral group A, a spiral group B and a hot air filter press; according to the coal-based gasified slag carbon residue backflow and cyclic check extraction system and process, the carbon residue recovery rate of coal-based gasified slag can reach 98% or above, and is far higher than the carbon residue recovery rate level of less than 60% in the same industry; according to the coal-based gasification slag carbon residue backflow and circulation check extraction system and process, the water content of a carbon product obtained after carbon residue extraction in coal-based gasification slag can be smaller than 40%, the water content of the carbon product is far higher than the water content of 50%-70% of extracted carbon in the same industry, and the industrial technical problem that gasification fine slag is difficult to dehydrate is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal chemical industry, in particular to a system and process for extracting residual carbon from coal-based gasification slag by reflux, circulation and reselection. Background Art

[0002] Sources and existing problems of coal-based gasification slag: Coal-based gasification slag is a solid residue produced in the coal gasification process using coal as raw material. It includes coarse gasification slag and fine gasification slag, and is a solid waste of coal chemical industry enterprises. It contains incompletely reacted carbon, ash and other oxides. In the existing coal gasification technology, the residual carbon content in coal-based gasification slag is relatively high, up to 10%-30%.

[0003] The resource utilization of coal-based gasification slag focuses on the recycling and reuse of residual carbon and the recycling and reuse of inorganic minerals in ash. Since the residual carbon in coal-based gasification slag is closely combined with ash, it is difficult to directly utilize it. The mixing of residual carbon and ash and the difficulty of separation technology have become bottlenecks restricting the resource utilization of coal-based gasification slag. Therefore, the separation of residual carbon and ash is the primary technical link for the resource utilization, high value, comprehensive and large-scale utilization of coal-based gasification slag.

[0004] At present, the large-scale treatment of coal-based gasification slag in my country is mostly landfill treatment, which causes problems such as resource waste, land occupation and environmental pollution. At the same time, the comprehensive recycling and reuse of coal-based gasification slag is gradually becoming a key factor restricting the development of the coal chemical industry. Therefore, there is an urgent need for a high-value, efficient, comprehensive and large-scale application technology for the treatment of coal-based gasification slag.

[0005] Defects of existing technology: First, affected by the current bottleneck of coal-based gasification slag carbon residue and ash separation technology, it directly leads to specific technical defects such as low coal-based gasification slag carbon residue recovery rate and low carbon purity after extraction: Coal-based gasification slag carbon residue recovery rate refers to the mass ratio of the carbon residue product extracted from the coal-based gasification slag after being treated by a certain coal-based gasification slag carbon residue extraction system and process to the carbon residue before extraction.

[0006] The carbon residue recovery rate not only affects the utilization rate of coal-based gasification slag carbon residue resources, but is also a key criterion for directly evaluating the advantages and disadvantages of this type of "gasification slag carbon residue extraction technology".

[0007] The higher the carbon residue recovery rate, the stronger the ability and higher the quality of the technology to recover and recycle carbon residue resources from coal-based gasification slag. High-quality carbon residue recovery rate is the front-end technical capability to ensure that carbon residue resources in solid wastes such as coal-based gasification slag are fully recovered and fully recycled. It is also the inevitable basic technical support for realizing the resource utilization and high-value utilization of bulk industrial solid waste.

[0008] The current traditional gasification slag carbon extraction process in China is limited by the defects of existing technologies, especially in the gasification slag raw material pretreatment stage of the traditional process. Due to the large loss and waste of the residual carbon in the gasification slag raw material, it directly leads to a low residual carbon recovery rate of less than 60%, resulting in resource loss in the comprehensive utilization of gasification slag.

[0009] The carbon purity after extraction is not high: The carbon purity after extraction of coal-based gasification slag residual carbon refers to the proportion of carbon and non-carbon in the residual carbon product extracted from coal-based gasification slag after being treated by a certain gasification slag carbon extraction system and process.

[0010] The purity of the extracted carbon not only affects the quality of the extracted carbon, but is also the core criterion for evaluating the pros and cons of this type of "gasification slag carbon extraction technology".

[0011] The higher the carbon purity after extraction, the more complete the technology's ability to separate residual carbon and ash from coal-based gasification slag, and the more sophisticated the separation technology. This will provide more outstanding technical support for the high-quality and high-value utilization of solid waste resources such as gasification slag, and will enable the high-quality and high-value utilization of bulk industrial solid waste to be achieved while promoting the high-standard and high-level development of the solid waste comprehensive utilization industry.

[0012] The current traditional gasification slag carbon extraction process in China is limited by the defects of existing technologies, especially in the one-way multi-stage sorting treatment stage of the traditional process. It is difficult to fully separate the residual carbon and non-carbon substances. While causing a large amount of residual carbon to be lost, it also reduces the carbon purity after extraction. The carbon purity is less than 85%, and the quality of the extracted carbon is poor.

[0013] Secondly, coal-based gasification fine slag is a filter cake formed by the concentration, sedimentation and filtration of gasification black water by a filter press, and has a high moisture content. Due to the strong water retention of gasification fine slag particles and the strong binding force between the hydrophilic functional groups on the particle surface and polar water, which seriously affects the dehydration efficiency, the dehydration of gasification fine slag has become a current technical problem in the industry. As a result, the carbon products extracted from coal-based gasification fine slag have high moisture content and are difficult to dehydrate, which affects the specific technical defects of reuse:

[0014] The extracted carbon has high moisture content and is difficult to dehydrate, which affects its reuse

[0015] Due to the characteristics of the residual carbon in coal-based gasification slag, such as developed pores, large specific surface area, severe surface oxidation, poor hydrophobicity, high water content (50%-70%), and low calorific value, which make it difficult to dehydrate and cannot be directly co-fired, the moisture content of the residual carbon product after extraction is still extremely high (50%-70%) after dehydration by conventional methods, which seriously affects the secondary use of the extracted carbon and the market value of the comprehensive utilization products of coal-based gasification slag.

[0016] Therefore, solving the high water content of coal-based gasification slag carbon residue and improving the dehydration capacity of extracted carbon are market demands for achieving high-quality and high-value recovery and reuse of coal-based gasification slag carbon residue products, and are also necessary to strengthen the market competitiveness of enterprises in the comprehensive utilization of coal-based gasification slag industry.

[0017] Finally, coal-based gasification slag includes coarse gasification slag and fine gasification slag, and the comprehensive treatment technology for coarse gasification slag and fine gasification slag is the technical guarantee for realizing the large-scale treatment capacity of coal-based gasification slag. Based on the requirements for large-scale treatment of coal-based gasification slag, combined with the current traditional process, the specific technical defects are manifested as a single treatment object, weak comprehensive treatment capacity and low overall treatment energy efficiency: single treatment object, weak comprehensive treatment capacity and low overall energy efficiency: Affected by the differences in the physical form, formation process and chemical composition of coarse gasification slag and fine gasification slag, the current traditional process can only treat coarse gasification slag or fine gasification slag alone, failing to achieve "one machine with multiple functions", which has become a factor restricting the large-scale treatment of coal-based gasification slag.

[0018] A comprehensive treatment process and system that can treat coarse gasification slag or fine gasification slag separately, or a mixture of coarse gasification slag and fine gasification slag, not only greatly saves investment costs, but is also an inevitable requirement for achieving large-scale utilization of coal-based gasification slag, while also improving the overall efficiency of the coal-based gasification slag treatment industry.

[0019] Due to the low carbon recovery rate of the current traditional gasification slag carbon extraction process, low carbon purity after extraction, high moisture content of the extracted carbon product, single treatment object, relatively high energy consumption and high equipment cost, it is very necessary to develop a coal-based gasification slag carbon extraction system and process with high carbon recovery rate, high carbon purity after extraction, relatively low moisture content of the extracted carbon product, comprehensive gasification slag treatment capability, relatively low energy consumption and relatively low investment cost. Summary of the invention

[0020] The purpose of the present invention is to solve the above-mentioned problems. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system and process are designed to solve the problems in the existing coal-based gasification slag carbon residue extraction technology, such as low carbon residue recovery rate, low carbon purity after extraction, high moisture content of extracted carbon products, single treatment object, relatively large energy consumption and high equipment cost, failure to achieve high quality, high added value and large-scale recovery and full recycling of coal-based gasification slag carbon residue, small waste of carbon residue resources and comprehensive treatment of gasification slag mixed raw materials.

[0021] The technical solution of the present invention to achieve the above-mentioned purpose is: a coal-based gasification slag residual carbon reflux, circulation and re-selection extraction system, including a circulating water tank, a water bubble machine, a water selection tank, a particle size separator, a sedimentation classifier, a desludging screen, an A spiral group, a B spiral group and a hot air filter press;

[0022] The circulating water pool is used to supply water to the water bubble machine, the water bubble machine is used to inject water into the water selection pool for impact, the discharge port of the water selection pool is connected to the feed port of the particle size separator, the under-screen discharge port of the particle size separator is connected to the feed port of the sedimentation classifier, the floating slurry discharge port of the sedimentation classifier is connected to the feed port of the desludging screen, the above-screen discharge port of the desludging screen is connected to the feed port of the A spiral group, the A concentrate slurry discharge port of the A spiral group is connected to the feed port of the B spiral group, and the concentrate slurry discharge port of the B spiral group is connected to the feed port of the hot air filter press.

[0023] Preferably, it comprises a first material tank, a first slurry pump, a second material tank, a second slurry pump, a concentrate slurry tank, a filter press pump and a finished carbon reservoir;

[0024] The feed port of the first material pool is connected to the outlet port on the desludging screen, the outlet port of the first material pool is connected to the feed port of the first slurry pump, the outlet port of the first slurry pump is connected to the feed port of the A spiral group, the feed port of the second material pool is connected to the outlet port of the A concentrate slurry of the A spiral group, the outlet port of the second material pool is connected to the feed port of the second slurry pump, the outlet port of the second slurry pump is connected to the feed port of the B spiral group, the feed port of the concentrate slurry pool is connected to the outlet port of the concentrate slurry of the B spiral group, the outlet port of the concentrate slurry pool is connected to the feed port of the filter press pump, the outlet port of the filter press pump is connected to the feed port of the hot air filter press, the concentrate slurry is pumped into the hot air filter press by the filter press pump for dehydration to form finished carbon, and the finished carbon is transported to the finished carbon storage.

[0025] Preferably, it comprises a residue reservoir, a coarse ash reservoir, a dewatering screen A, a fine ash reservoir A, a dewatering screen B, a fine ash reservoir B, a tailings filter press pump, a tailings filter press and a tailings reservoir;

[0026] The feed port of the residue bin is connected to the above-sieve discharge port of the particle size separator, the feed port of the coarse ash bin is connected to the coarse ash discharge port of the sedimentation classifier, the feed port of the A dewatering screen is connected to the A tailings discharge port of the A spiral group, the above-sieve discharge port of the A dewatering screen is connected to the feed port of the A fine ash bin, the feed port of the B dewatering screen is connected to the B tailings discharge port of the B spiral group, the above-sieve discharge port of the B dewatering screen is connected to the feed port of the B fine ash bin, the feed port of the tailings filter press pump is connected to the discharge port of the sedimentation tank, the discharge port of the tailings filter press pump is connected to the feed port of the tailings filter press, and the tailings discharge port of the tailings filter press is connected to the feed port of the tailings bin.

[0027] Preferably, the undersize mud of the desludging screen, the undersize water of the A dewatering screen, the undersize water of the B dewatering screen, and the filtered water of the hot air filter press all enter the sedimentation tank through a gravity water tank;

[0028] The filtered water from the tailings filter press enters the circulating water pool through the gravity water tank.

[0029] Preferably, a gravity water trough is installed between the water selection tank and the particle size separator, between the particle size separator and the sedimentation classifier, between the sedimentation classifier and the desludging screen, between the desludging screen and the first material tank, between the desludging screen and the sedimentation tank, between the A spiral group and the second material tank, between the A spiral group and the A dewatering screen, between the B spiral group and the concentrate slurry tank, and between the B spiral group and the B dewatering screen;

[0030] Conveyor belts are installed between the particle size sorter and the residue bin, between the sedimentation classifier and the coarse ash bin, between the A dewatering screen and the A fine ash bin, between the B dewatering screen and the B fine ash bin, between the hot air filter press and the finished carbon bin, and between the tailings filter press and the tailings bin.

[0031] Preferably, the particle size sorter is a single unit or multiple units connected in series, the sorter adopts a linear vibrating screen, the sedimentation classifier is a single unit or multiple units connected in series, the classifier adopts a single shaft, the A spiral group and the B spiral group are multiple units connected in series, using a spiral chute, the hot air filter press is a single unit or multiple units connected in series, using an automated hot air back-blowing filter press, and the tail mud filter press is a single unit or multiple units connected in series, using a high-pressure diaphragm filter press.

[0032] A coal-based gasification slag residual carbon reflux, circulation and reselection extraction process, comprising the following steps:

[0033] Step 1: continuously inject water into the gasified slag solid to make it dispersed and easy to flow;

[0034] Step 2, separating the gasified slag into particles to obtain slurry and residue;

[0035] Step 3, sedimenting and classifying the slurry to obtain floating slurry and coarse ash;

[0036] Step 4, desludging the floating slurry to obtain slurry with a mesh size of 200 or more and mud with a mesh size of less than 200;

[0037] Step 5, subjecting the ore pulp with a mesh size of 200 or more to the first spiral treatment to obtain A concentrate pulp, A middling pulp and A tailings;

[0038] Step 6, subjecting the A concentrate slurry to a second spiral treatment to obtain concentrate slurry, B middling slurry and B tailings;

[0039] Step 7: Dewater the concentrate slurry by hot air filter pressing to form finished carbon.

[0040] Preferably, after the slurry in A in step 5 is refluxed into the first material pool, the spiral separation in step 5 is repeated;

[0041] The slurry in B in step 6 is refluxed into the second material pool and then the spiral treatment in step 6 is repeated.

[0042] Preferably, during the continuous water injection impact of the gasified slag, the water supply volume is 400 cubic meters per hour;

[0043] The gasified slag flows by gravity into a single or multiple particle size separators for vibration separation;

[0044] The slurry enters a single or multiple sedimentation classifiers by gravity flow for sedimentation classification;

[0045] The floating slurry enters a single or multiple desludging screens for desludging and extraction by gravity flow;

[0046] The ore slurry with a mesh size of 200 or more enters multiple A spiral groups for classification through a single or multiple first slurry pumps;

[0047] The A concentrate slurry enters multiple B spiral groups for classification through a single or multiple second slurry pumps;

[0048] The concentrate pulp enters a single or multiple hot air filter presses through a single or multiple filter press pumps for drying, dehydration and extraction;

[0049] The tailings are pumped into one or more tailings filter presses for dehydration and extraction;

[0050] The A tailings and B tailings flow by gravity into a single or multiple A dewatering screens and B dewatering screens respectively, and then dewatered to extract A fine ash and B fine ash;

[0051] The vibration frequency of the particle size separator is a fixed frequency of 960 rpm, the mesh aperture is 3 mm, and the motor is 2 6-level motors;

[0052] The vibration frequency of the desludging screen is a fixed frequency of 960 rpm, the aperture of the screen cloth is 200 meshes, and the motor is 2 6-level motors;

[0053] The working flow rate of the first slurry pump is 400 cubic meters per hour, the frequency is 1440 revolutions per minute, the power is 45 kilowatts, and the motor is a 4-stage single motor;

[0054] The working flow rate of the second slurry pump is 260 cubic meters per hour, the frequency is 960 revolutions per minute, the power is 22 kilowatts, and the motor is a 6-stage single motor;

[0055] The filter press pump has a frequency of 960 rpm, a power of 75 kW, and a 6-stage single motor;

[0056] The A dewatering screen and the B dewatering screen both adopt a frequency of 960 revolutions per minute, a screen cloth with an aperture of 120 meshes and two 6-level motors.

[0057] A coal-based gasification slag carbon residue reflux, circulation and re-selection extraction system and process produced by the technical solution of the present invention can achieve a coal-based gasification slag carbon residue recovery rate of more than 98%: A coal-based gasification slag carbon residue reflux, circulation and re-selection extraction system and process provided by the present invention can achieve a coal-based gasification slag carbon residue recovery rate of more than 98%, which is much higher than the carbon residue recovery rate level of less than 60% in the same industry.

[0058] It is further explained that the coal-based gasification slag carbon residue reflux, circulation and reselection extraction system and process provided by the present invention achieves a coal-based gasification slag carbon residue recovery rate of more than 98%, which is not only applicable to the gasification coarse slag in the coal-based gasification slag, but also to the gasification fine slag in the coal-based gasification slag, and also to the mixed slag of the gasification coarse slag and the gasification fine slag in the coal-based gasification slag.

[0059] The carbon purity of coal-based gasification slag carbon residue after extraction reaches 90%: The coal-based gasification slag carbon residue reflux, circulation and re-selection extraction system and process provided by the present invention can achieve a carbon purity of 90% (including 10% ash content) after coal-based gasification slag carbon residue extraction, which is much higher than the carbon purity level of less than 85% in the same industry.

[0060] It is further explained that the 90% carbon purity of the coal-based gasification slag carbon residue after extraction achieved by the coal-based gasification slag carbon residue reflux, circulation and reselection extraction system and process provided by the present invention is not only applicable to the gasification coarse slag in the coal-based gasification slag, but also to the gasification fine slag in the coal-based gasification slag, and also to the mixed slag of the gasification coarse slag and the gasification fine slag in the coal-based gasification slag.

[0061] The moisture content of extracted carbon is less than 40%: the coal-based gasification slag residual carbon reflux, circulation and reselection extraction system and process provided by the present invention can achieve the moisture content of the carbon product (abbreviated as: extracted carbon) after the residual carbon is extracted from the coal-based gasification slag is less than 40%, which is much higher than the 50%-70% moisture content of extracted carbon in the same industry, and effectively solves the industry technical problem of the difficulty in dehydrating gasification fine slag.

[0062] It is further explained that the moisture content of extracted carbon of less than 40% achieved by the coal-based gasification slag residual carbon reflux, circulation and reselection extraction system and process provided by the present invention is not only applicable to gasified coarse slag in coal-based gasification slag, but also to gasified fine slag in coal-based gasification slag, and also to the mixed slag of gasified coarse slag and gasified fine slag in coal-based gasification slag.

[0063] "One machine with multiple uses" comprehensive treatment function of coal-based gasification slag: The coal-based gasification slag residual carbon reflux, circulation and re-selection extraction system and process provided by the present invention can achieve single treatment of coal-based gasification coarse slag or coal-based gasification fine slag, while processing the mixed slag of coal-based gasification coarse slag and coal-based gasification fine slag.

[0064] In view of the processes in the same industry that can only process single coal-based gasification coarse slag or coal-based gasification fine slag, the present invention provides a coal-based gasification slag residual carbon reflux, circulation and re-selection extraction system and process, which has a comprehensive processing function of "one machine for multiple uses" far exceeding that of the same industry in the technical application of treating coal-based gasification slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the coal-based gasification slag residual carbon reflux, circulation and reselection extraction system of the present invention;

[0066] In the figure: 1, water selection tank, 2, water bubble machine, 3, particle size separator, 4, ore pulp, 5, residue storage, 6, sedimentation classifier, 7, floating ore pulp, 8, coarse ash storage, 9, desludging screen, 10, 200 mesh ore pulp, 11, first material tank, 12, first slurry pump, 13, A spiral group, 14, A medium ore pulp, 15, A concentrate slurry, 16, A tailings, 17, A dewatering screen, 18, A fine Ash storage, 19. Second material pool, 20. Second slurry pump, 21. B spiral group, 22. B medium ore slurry, 23. Concentrate slurry pool, 24. B tailings, 25. B dewatering screen, 26. B fine ash storage, 27. Filter press pump, 28. Hot air filter press, 29. Finished carbon storage, 30. Sedimentation tank, 31. Tailings filter press pump, 32. Tailings filter press, 33. Tailings storage, 34. Circulating water pool. DETAILED DESCRIPTION

[0067] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1 As shown, a system and process for reflux, circulation and reselection extraction of residual carbon from coal-based gasification slag.

[0068] Embodiment: A coal-based gasification slag residual carbon reflux, circulation and reselection extraction system, comprising a circulating water tank 34, a water bubble machine 2, a water selection tank 1, a particle size separator 3, a sedimentation classifier 6, a desludging screen 9, an A spiral group 13, a B spiral group 21 and a hot air filter press 28;

[0069] The circulating water pool 34 is used to supply water to the water bubble machine 2, the water bubble machine 2 is used to inject water into the water selection pool 1 for impact, the discharge port of the water selection pool 1 is connected to the feed port of the particle size separator 3, the under-screen discharge port of the particle size separator 3 is connected to the feed port of the sedimentation classifier 6, the floating slurry discharge port of the sedimentation classifier 6 is connected to the feed port of the desludging screen 9, the above-screen discharge port of the desludging screen 9 is connected to the feed port of the A spiral group 13, the A concentrate slurry discharge port of the A spiral group 13 is connected to the feed port of the B spiral group 21, and the concentrate slurry discharge port of the B spiral group 21 is connected to the feed port of the hot air filter press 28.

[0070] It includes a first material pool 11, a first slurry pump 12, a second material pool 19, a second slurry pump 20, a concentrate slurry pool 23, a filter press pump 27 and a finished carbon reservoir 29;

[0071] The feed port of the first material pool 11 is connected to the screen discharge port of the desludging screen 9, the discharge port of the first material pool 11 is connected to the feed port of the first slurry pump 12, the discharge port of the first slurry pump 12 is connected to the feed port of the A spiral group 13, the feed port of the second material pool 19 is connected to the A concentrate slurry discharge port of the A spiral group 13, the discharge port of the second material pool 19 is connected to the feed port of the second slurry pump 19, the discharge port of the second slurry pump 19 is connected to the feed port of the B spiral group 21, the feed port of the concentrate slurry pool 23 is connected to the concentrate slurry discharge port of the B spiral group 21, the discharge port of the concentrate slurry pool 23 is connected to the feed port of the filter press pump 27, the discharge port of the filter press pump 27 is connected to the feed port of the hot air filter press 28, the concentrate slurry is pumped into the hot air filter press 28 by the filter press pump 27 for dehydration to form finished carbon, and the finished carbon is transported to the finished carbon storage 29.

[0072] It includes a residue reservoir 5, a coarse ash reservoir 8, an A dewatering screen 17, an A fine ash reservoir 18, a B dewatering screen 25, a B fine ash reservoir 26, a tailings filter press pump 31, a tailings filter press 32 and a tailings reservoir 33;

[0073] The feed port of the residue storage 5 is connected to the above-sieve discharge port of the particle size separator 3, the feed port of the coarse ash storage 8 is connected to the coarse ash discharge port of the sedimentation classifier 6, the feed port of the A dewatering screen 17 is connected to the A tailings discharge port of the A spiral group 13, the above-sieve discharge port of the A dewatering screen 17 is connected to the feed port of the A fine ash storage 18, the feed port of the B dewatering screen 25 is connected to the B tailings discharge port of the B spiral group 21, the above-sieve discharge port of the B dewatering screen 25 is connected to the feed port of the B fine ash storage 26, the feed port of the tailings filter press pump 31 is connected to the discharge port of the sedimentation tank 30, the discharge port of the tailings filter press pump 31 is connected to the feed port of the tailings filter press 32, and the tailings discharge port of the tailings filter press 32 is connected to the feed port of the tailings storage 33.

[0074] The undersize mud of the desludging screen 9, the undersize water of the A dewatering screen 17, the undersize water of the B dewatering screen 25, and the filtered water of the hot air filter press 28 all enter the sedimentation tank 30 through the gravity water tank;

[0075] The filtered water from the tailings filter press 32 enters the circulating water pool 34 through the gravity water tank.

[0076] A gravity water tank is installed between the water selection tank 1 and the particle size separator 3, between the particle size separator 3 and the sedimentation classifier 6, between the sedimentation classifier 6 and the desludging screen 9, between the desludging screen 9 and the first material tank 11, between the desludging screen 9 and the sedimentation tank 30, between the A spiral group 13 and the second material tank 19, between the A spiral group 13 and the A dewatering screen 17, between the B spiral group 21 and the concentrate slurry tank 23, and between the B spiral group 21 and the B dewatering screen 25;

[0077] Conveyor belts are installed between the particle size classifier 3 and the residue bin 5, between the sedimentation classifier 6 and the coarse ash bin 8, between the A dewatering screen 17 and the A fine ash bin 18, between the B dewatering screen 25 and the B fine ash bin 26, between the hot air filter press 28 and the finished carbon bin 29, and between the tailings filter press 32 and the tailings bin 33.

[0078] The particle size classifier 3 is a single unit or multiple units connected in series, and the classifier adopts a linear vibrating screen. The sedimentation classifier 6 is a single unit or multiple units connected in series, and the classifier adopts a single shaft. The A spiral group 13 and the B spiral group 21 are multiple units connected in series, and a spiral chute is adopted. The hot air filter press 28 is a single unit or multiple units connected in series, and an automated hot air back-blowing filter press is adopted. The tail mud filter press 32 is a single unit or multiple units connected in series, and a high-pressure diaphragm filter press is adopted.

[0079] A coal-based gasification slag residual carbon reflux, circulation and reselection extraction process, comprising the following steps:

[0080] Step 1: continuously inject water into the gasified slag solid to make it dispersed and easy to flow;

[0081] Step 2, separating the gasified slag into particles to obtain slurry and residue;

[0082] Step 3, sedimenting and classifying the slurry to obtain floating slurry and coarse ash;

[0083] Step 4, desludging the floating slurry to obtain slurry with a mesh size of 200 or more and mud with a mesh size of less than 200;

[0084] Step 5, subjecting the ore pulp with a mesh size of 200 or more to the first spiral treatment to obtain A concentrate pulp, A middling pulp and A tailings;

[0085] Step 6, subjecting the A concentrate slurry to a second spiral treatment to obtain concentrate slurry, B middling slurry and B tailings;

[0086] Step 7: Dewater the concentrate slurry by hot air filter pressing to form finished carbon.

[0087] The slurry in A in step 5 is refluxed into the first material pool and then the spiral separation in step 5 is repeated;

[0088] The slurry in B in step 6 is refluxed into the second material pool and then the spiral treatment in step 6 is repeated.

[0089] When the gasified slag is continuously injected with water, the water supply is 400 cubic meters per hour (per 100 tons of gasified slag);

[0090] The gasified slag flows by gravity into a single or multiple particle size separators 3 for vibration separation;

[0091] The slurry flows by gravity into one or more sedimentation classifiers 6 for sedimentation and classification;

[0092] The floating slurry flows by gravity into a single or multiple desludging screens 9 for desludging and extraction;

[0093] The ore pulp with a mesh size of 200 or more enters multiple A spiral groups 13 for classification through a single or multiple first slurry pumps 12;

[0094] The A concentrate slurry enters multiple B spiral groups 21 for classification through a single or multiple second slurry pumps 20;

[0095] The concentrate pulp passes through a single or multiple filter press pumps 27 and enters a single or multiple hot air filter presses 28 for drying, dehydration and extraction;

[0096] The tailings enter into a single or multiple tailings filter presses 32 for dehydration and extraction through a single or multiple tailings filter press pumps 31;

[0097] Tailings A and tailings B flow into single or multiple dewatering screens A 17 and B 25 respectively through gravity flow, and then dewatered to extract fine ash A and fine ash B;

[0098] The vibration frequency of the particle size separator 3 is a fixed frequency of 960 rpm, the mesh aperture is 3 mm, and the motor is 2 6-level motors;

[0099] The vibration frequency of the desludging screen 9 is a fixed frequency of 960 rpm, the aperture of the screen cloth is 200 mesh (0.074 mm), and the motor is 2 6-level motors;

[0100] The working flow of the first slurry pump 12 is 400 cubic meters per hour, the frequency is 1440 revolutions per minute, the power is 45 kilowatts, and the motor is a 4-stage single motor;

[0101] The working flow of the second slurry pump 20 is 260 cubic meters per hour, the frequency is 960 revolutions per minute, the power is 22 kilowatts, and the motor is a 6-stage single motor;

[0102] The filter press pump 27 has a frequency of 960 rpm, a power of 75 kW, and a 6-stage single motor;

[0103] The A dewatering screen 17 and the B dewatering screen 25 both use a frequency of 960 revolutions per minute, a screen cloth with an aperture of 120 meshes (about 0.125 mm) and two 6-level motors.

[0104] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system, characterized in that: It comprises a circulating water pool (34), a water bubble machine (2), a water selection pool (1), a particle size separator (3), a sedimentation classifier (6), a desludging screen (9), an A spiral group (13), a B spiral group (21) and a hot air filter press (28); The circulating water pool (34) is used to supply water to the water bubble machine (2), and the water bubble machine (2) is used to inject water into the water selection pool (1) for impact. The discharge port of the water selection pool (1) is connected to the feed port of the particle size separator (3), the under-screen discharge port of the particle size separator (3) is connected to the feed port of the sedimentation classifier (6), the floating slurry discharge port of the sedimentation classifier (6) is connected to the feed port of the desludging screen (9), the over-screen discharge port of the desludging screen (9) is connected to the feed port of the A spiral group (13), the A concentrate slurry discharge port of the A spiral group (13) is connected to the feed port of the B spiral group (21), and the concentrate slurry discharge port of the B spiral group (21) is connected to the feed port of the hot air filter press (28).

2. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system according to claim 1, characterized in that: It comprises a first material pool (11), a first slurry pump (12), a second material pool (19), a second slurry pump (20), a concentrate slurry pool (23), a filter press pump (27) and a finished carbon reservoir (29); The feed port of the first material pool (11) is connected to the screen outlet of the desludging screen (9), the outlet of the first material pool (11) is connected to the feed port of the first slurry pump (12), the outlet of the first slurry pump (12) is connected to the feed port of the A spiral group (13), the feed port of the second material pool (19) is connected to the A concentrate slurry outlet of the A spiral group (13), the outlet of the second material pool (19) is connected to the feed port of the second slurry pump (19), and the second slurry pump ( The discharge port of the concentrate slurry pool (23) is connected to the feed port of the concentrate slurry of the B spiral group (21), the discharge port of the concentrate slurry pool (23) is connected to the feed port of the filter press pump (27), the discharge port of the filter press pump (27) is connected to the feed port of the hot air filter press (28), and the concentrate slurry is pumped into the hot air filter press (28) by the filter press pump (27) for dehydration to form finished carbon, which is then transported to the finished carbon reservoir (29).

3. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system according to claim 2, characterized in that: It includes a residue reservoir (5), a coarse ash reservoir (8), an A dewatering screen (17), an A fine ash reservoir (18), a B dewatering screen (25), a B fine ash reservoir (26), a tailings filter press pump (31), a tailings filter press (32) and a tailings reservoir (33); The feed inlet of the residue storehouse (5) is connected to the screen discharge port of the particle size separator (3), the feed inlet of the coarse ash storehouse (8) is connected to the coarse ash discharge port of the sedimentation classifier (6), the feed inlet of the A dewatering screen (17) is connected to the A tailings discharge port of the A spiral group (13), the screen discharge port of the A dewatering screen (17) is connected to the feed inlet of the A fine ash storehouse (18), the feed inlet of the B dewatering screen (25) is connected to the B spiral group (13), and the feed inlet of the B dewatering screen (25) is connected to the B spiral group (13). The tailings discharge port of the group (21) is connected, the screen discharge port of the B dewatering screen (25) is connected to the feed port of the B fine ash storage (26), the feed port of the tailings filter press pump (31) is connected to the discharge port of the sedimentation tank (30), the discharge port of the tailings filter press pump (31) is connected to the feed port of the tailings filter press (32), and the tailings discharge port of the tailings filter press (32) is connected to the feed port of the tailings storage (33).

4. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system according to claim 3, characterized in that: The under-sieve mud of the desludging screen (9), the under-sieve water of the A dewatering screen (17), the under-sieve water of the B dewatering screen (25), and the filtered water of the hot air filter press (28) all enter the sedimentation tank (30) through the gravity water tank; The filtered water from the tailings filter press (32) enters the circulating water pool (34) through the gravity water tank.

5. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system according to claim 4, characterized in that: A gravity water trough is installed between the water selection tank (1) and the particle size separator (3), between the particle size separator (3) and the sedimentation classifier (6), between the sedimentation classifier (6) and the desludging screen (9), between the desludging screen (9) and the first material tank (11), between the desludging screen (9) and the sedimentation tank (30), between the A spiral group (13) and the second material tank (19), between the A spiral group (13) and the A dewatering screen (17), between the B spiral group (21) and the concentrate slurry tank (23), and between the B spiral group (21) and the B dewatering screen (25); Conveyor belts are installed between the particle size separator (3) and the residue reservoir (5), between the sedimentation classifier (6) and the coarse ash reservoir (8), between the A dewatering screen (17) and the A fine ash reservoir (18), between the B dewatering screen (25) and the B fine ash reservoir (26), between the hot air filter press (28) and the finished carbon reservoir (29), and between the tailings filter press (32) and the tailings reservoir (33).

6. A coal-based gasification slag carbon residue reflux, circulation and reselection extraction system according to claim 5, characterized in that: The particle size separator (3) is a single unit or multiple units connected in series, and the separator adopts a linear vibrating screen. The sedimentation classifier (6) is a single unit or multiple units connected in series, and the classifier adopts a single shaft. The A spiral group (13) and the B spiral group (21) are multiple units connected in series, and a spiral chute is adopted. The hot air filter press (28) is a single unit or multiple units connected in series, and an automated hot air back-blowing filter press is adopted. The tail mud filter press (32) is a single unit or multiple units connected in series, and a high-pressure diaphragm filter press is adopted.

7. A coal-based gasification slag carbon residue reflux, cyclic re-selection and extraction process, using a coal-based gasification slag carbon residue reflux, cyclic re-selection and extraction system as described in any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: continuously inject water into the gasified slag solid to make it dispersed and easy to flow; Step 2, separating the gasified slag into particles to obtain slurry and residue; Step 3, sedimenting and classifying the slurry to obtain floating slurry and coarse ash; Step 4, desludging the floating slurry to obtain slurry with a mesh size of 200 or more and mud with a mesh size of less than 200; Step 5, subjecting the ore pulp with a mesh size of 200 or more to the first spiral treatment to obtain A concentrate pulp, A middling pulp and A tailings; Step 6, subjecting the A concentrate slurry to a second spiral treatment to obtain concentrate slurry, B middling slurry and B tailings; Step 7: Dewater the concentrate slurry by hot air filter pressing to form finished carbon.

8. The process for extracting residual carbon from coal-based gasification slag by reflux and circulation reselection according to claim 7, characterized in that: The slurry in A in step 5 is refluxed into the first material pool and then the spiral separation in step 5 is repeated; The slurry in B in step 6 is refluxed into the second material pool and then the spiral treatment in step 6 is repeated.

9. The process for extracting residual carbon from coal-based gasification slag by reflux and circulation reselection according to claim 8, characterized in that: When the gasified slag is continuously injected with water, the water supply is 400 cubic meters per hour; The gasified slag flows by gravity into a single or multiple particle size separators (3) for vibration separation; The ore pulp flows by gravity into one or more sedimentation classifiers (6) for sedimentation classification; The floating slurry flows by gravity into a single or multiple desludging screens (9) for desludging and extraction; The ore slurry with a mesh size of 200 or more enters into multiple A spiral groups (13) through a single or multiple first slurry pumps (12) for classification; The A concentrate slurry enters a plurality of B spiral groups (21) through a single or multiple second slurry pumps (20) for classification; The concentrate slurry enters a single or multiple hot air filter presses (28) through a single or multiple filter press pumps (27) for drying, dehydration and extraction; The tailings mud passes through a single or multiple tailings mud filter press pumps (31) and enters a single or multiple tailings mud filter presses (32) for dehydration and extraction; The A tailings and the B tailings flow by gravity into a single or multiple A dewatering screens (17) and B dewatering screens (25) respectively to be dewatered and then extract A fine ash and B fine ash; The vibration frequency of the particle size separator (3) is a fixed frequency of 960 revolutions per minute, the mesh aperture is 3 mm, and the motors are two 6-level motors; The desludging screen (9) has a vibration frequency of 960 rpm, a sieve cloth aperture of 200 meshes, and two 6-level motors; The first slurry pump (12) has a working flow rate of 400 cubic meters per hour, a frequency of 1440 revolutions per minute, a power of 45 kilowatts, and a motor of a 4-stage single motor; The working flow rate of the second slurry pump (20) is 260 cubic meters per hour, the frequency is 960 revolutions per minute, the power is 22 kilowatts, and the motor is a 6-stage single motor; The filter press pump (27) has a frequency of 960 rpm, a power of 75 kW, and a motor of 6-stage single motor; The A dewatering screen (17) and the B dewatering screen (25) both use a frequency of 960 revolutions per minute, a screen cloth with an aperture of 120 meshes, and two 6-level motors.

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