CN110624506A - Method for preparing water purifying agent by utilizing coal gasification furnace slag and obtained water purifying agent - Google Patents
Method for preparing water purifying agent by utilizing coal gasification furnace slag and obtained water purifying agent Download PDFInfo
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- CN110624506A CN110624506A CN201911018910.1A CN201911018910A CN110624506A CN 110624506 A CN110624506 A CN 110624506A CN 201911018910 A CN201911018910 A CN 201911018910A CN 110624506 A CN110624506 A CN 110624506A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
- B01J20/28019—Spherical, ellipsoidal or cylindrical
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/135—Combustion residues, e.g. fly ash, incineration waste
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a method for preparing a water purifying agent by utilizing coal gasification furnace slag and the obtained water purifying agent, belonging to the field of waste industrial product treatment. A method for preparing a water purifying agent by utilizing coal gasification furnace slag comprises the following steps: 1) sorting the fine slag to obtain three materials of fine ash, porous carbon particles and coarse ash; 2) pumping the coarse ash material to a sieve with the diameter of 1mm, washing with clear water, leaching, dehydrating and air-drying; sending the fine ash material into a settling tank, adding a flocculating agent for settling and concentrating, and then sending to a filter press for dehydration to obtain a fine ash filter cake; drying the fine ash filter cake after scattering, and removing the internal water in the pore structure of the microspheres; 3) mixing the dried fine ash and the dried coarse ash with a binder, granulating on a granulator, and drying to obtain a spherical water purifying agent; the water purifying agent prepared by the preparation method has better strength, specific surface area, porosity and adsorption performance than or equal to those of similar products, and has great market competitiveness due to low manufacturing cost.
Description
Technical Field
The invention belongs to the field of waste industrial product treatment, and particularly relates to a method for preparing a water purifying agent by utilizing coal gasification furnace slag and the obtained water purifying agent.
Background
The coal chemical industry enterprise discharges more than 1000 million tons of gasification ash slag every year, so that the discharge and treatment of the gasification slag become an industrial problem. At present, coal gasification slag is not well utilized, the research and utilization reports on the coal gasification slag at home and abroad are few, the research is basically focused on the basic physical and chemical characteristics of the coal gasification slag, the analysis is carried out on the problems of the basic characteristics and the application of the Texaco coal gasification slag such as Tangyun, and the core composition of the coal gasification slag is provided to belong to SiO2Residual carbon and other substances, the actual coarse slag structure of the coal gasification furnace is a porous framework, the coarse slag structure belongs to a spongy framework, and the actual amorphous glass is compact; meanwhile, there is also a study on the use of coal gasification slag for manufacturing building bricks, for example, a.acosta prepares building bricks by using coal gasification slag and clay. In the research of Yunjing, Shangpo and the like, the influence and the effect of the coal gasification furnace slag on the performance of related wall materials are mainly analyzed.
At present, most of the activated carbon or porous carbon is separated from the slag in a gasification furnace through drug flotation and is used as a water purifying agent, the residual tailings are still hidden troubles in the aspect of environmental protection when useless products are treated, the cost of the separation process is high, the separation effect is not good, and the cost is high and the environmental protection defect exists in the literature that the water purifying agent is synthesized after aluminum and iron components in the fly ash or ash residue of a power plant are dissolved out through hydrochloric acid.
The active carbon water purifying agent has two functions of decoloring and impurity adsorption. The wood powder activated carbon has the best performance on the water body decoloring effect, and has good decoloring capacity, adsorption capacity and cost performance. In the actual water body treatment, powdered activated carbon such as wood powder activated carbon has great defects in the filtration link. In order to solve the filtration problem, the filtration treatment is most commonly carried out by using a filter press, but the cost of the machine is not low, which is not beneficial to the application of some small and medium-sized water treatment plants.
Coal-based activated carbon is less commonly used in a small-scale drinking water treatment because it contains a small amount of sulfur, which has a certain effect on the human body. However, with the intensive research on coal-based activated carbon, the coal raw material in the production of the coal-based activated carbon is replaced by anthracite production, so that the sulfur content in the coal-based activated carbon is reduced to a usable range. Coal-based activated carbon is mostly applied to water treatment of large-scale water plants at present.
Disclosure of Invention
The invention aims to overcome the defect that the coal gasification furnace slag can not be fully utilized in the prior art, and provides a method for preparing a water purifying agent by using the coal gasification furnace slag and the obtained water purifying agent.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for preparing a water purifying agent by utilizing coal gasification furnace slag comprises the following steps:
1) separating fine slag from a coal gas ash water system by using a spiral separator to respectively obtain three strands of water-containing materials, namely fine ash, porous carbon particles and coarse ash;
2) pumping the coarse ash material to a 1mm screen mesh for washing, and drying the coarse ash on the screen mesh for later use;
sending the fine ash material into a settling tank, adding a flocculating agent for settling and concentrating, and then sending to a filter press for dehydration to obtain a fine ash filter cake;
drying the fine ash filter cake after scattering, and removing the internal water in the pore structure of the microspheres;
3) uniformly mixing the dried fine ash and the dried coarse ash with a binder aqueous solution, granulating on a granulator to obtain 3-4mm of ceramsite, and drying to obtain a spherical water purifying agent;
the adhesive comprises the following components in parts by mass:
40-60 parts of polyprenol, 20-30 parts of polybutyral and 20-40 parts of sodium silicate;
the mass ratio of the sum of the components in the aqueous solution of the binder to water is 15: 100, respectively;
the mixed mixture comprises, by mass, 40-70 parts of fine ash, 20-35 parts of coarse ash and 8-15 parts of a binder aqueous solution.
Further, step 1) further comprises secondary sorting, and the operation is as follows:
and mixing the coarse ash material and the fine ash material, then feeding the mixture into a primary ash water tank, pumping the mixture to a secondary spiral sorting machine for sorting, and obtaining three strands of water-containing materials of fine ash, porous carbon particles and coarse ash again.
Furthermore, the ignition loss of the fine ash in the fine ash material obtained after separation is 10% -20%, and the ignition loss of the coarse ash in the coarse ash material is lower than 8%.
Further, drying by using flue gas of a rotary kiln or microwaves in the step 2).
Further, 12 parts of aqueous binder solution is added in the mixing process in the step 3).
Further, the flocculating agent in the step 2) is K2FeO4。
The water purifying agent obtained by the method for preparing the water purifying agent is disclosed by the invention.
Compared with the prior art, the invention has the following beneficial effects:
according to the method for preparing the water purifying agent by utilizing the coal gasification furnace slag, fine ash and coarse ash are separated through screening separation of the spiral separator, and then are subjected to flocculation sedimentation, so that the fine ash collection efficiency is improved, and the extruded water can be recycled for supply of separation process water flow, so that waste of water resources is avoided; the fine ash pores are quite developed, when granulation is carried out, the coarse ash particles are taken as a framework, the binder is a composite PVA type, the fine ash is gradually agglomerated on the surface of the fine ash into balls under the action of the binder, and the composite PVA type binder is polymerized and cured during heating and drying to generate strength; the adhesive can improve the adsorption capacity of the water purifying agent on organic matters in water while keeping the hydrophilicity of the water purifying agent, and a granulated product can keep certain strength without sintering; the preparation method is simple, the used equipment is common, the raw materials are cheap, and the industrial water purifying agent can be produced in a large scale.
Further, secondary separation is carried out, porous carbon contained in the coarse ash material and the fine ash material is obtained, the porous carbon is further recycled, and the separation efficiency is improved; in the separation process, the separation can be completed at the three-port flow dividing channel at the bottom end by increasing the falling flow speed of water flow without applying power.
Furthermore, the ignition loss of the fine ash in the fine ash material obtained after sorting is 10% -20%, the ignition loss of the coarse ash in the coarse ash material is lower than 8%, the porous carbon in the fine slag can be recovered to the maximum extent, 1 ton of porous carbon can be recovered from 5 tons of fine slag in the production process as a blast furnace injection material and a special steel smelting raw material, and the porous carbon can also be modified to produce active carbon and other carbon materials; the rest waste ash to be buried and treated is processed into an industrial water purifying agent, so that the fine slag of the coal gas ash water system is completely utilized; the preparation method has simple steps, can realize graded resource utilization and complete conversion of the gasified fine slag, and has obvious environmental benefit.
Furthermore, when 12 parts of aqueous solution of the binder is added, the strength of the granulated product is higher
Further, the flocculating agent in the fine ash pond is K2FeO4The raw materials are cheap, and the quick flocculation and sedimentation concentration of fine-grained substances in water can be realizedAnd the production period can be shortened.
The water purifying agent prepared by the preparation method of the invention has better strength, specific surface area, porosity and adsorption performance than or equal to those of similar products, and has great market competitiveness due to low manufacturing cost.
Drawings
FIG. 1 is a flow diagram of the present invention for the separation of fine gasified slag;
referring to fig. 2, fig. 2 is an SEM image of the sorted material of example 1, 2(a) is an SEM image of fine ash, 2(b) is an SEM image of coarse ash, and 2(c) is an SEM image of porous carbon;
FIG. 3 is a comparison of before and after adsorption in example 1.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The gasification furnace slag can be divided into coarse slag and fine slag (some are called fine ash) according to different discharge positions, the coarse slag is a broken block-shaped vitreous body formed by a low-melting-point eutectic in the coal ash and water quenching, the broken block-shaped vitreous body is discharged from a furnace bottom ash lock hopper, the structure is compact, the fine slag is formed by micron-sized hollow particles or particle sintering aggregates formed by high-difficulty completely molten aluminosilicate and some incompletely gasified fine porous residual carbon, and the coal gas together with the gas is discharged from the gasification furnace, washed and separated from the coal gas to enter a settling tank of a grey water system. The invention uses the characteristics of developed pores of gasified fine slag, high specific surface area and high adsorption performance to prepare the water purifying agent, can be used for treating certain sewage difficult to treat or sudden accident sewage in the coal chemical industry, and particularly has better treatment effect on high-salt sewage. The invention adopts a simpler spiral separation method, has simple process, and uses the separated porous carbon as a product with high added value, but uses the separated tailings as a water purifying agent, thereby changing waste into valuable and having low cost, and on the other hand, the invention can realize dry extraction of gasified fine slag to achieve complete resource utilization.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a flow chart of the present invention, and the specific steps include the following steps:
step 1) separation of coal gasification furnace slag
Mixing and stirring coal gasification furnace slag and water, placing the mixture on a spiral separator for separation, wherein a slideway at the lower end of the spiral separator is divided into an outer layer, a middle layer and an inner layer; the coal gasification furnace slag flows to the lower end from the top along with the water flow, the speed of the water flow is continuously increased in the process, the speed of the coal gasification furnace slag is higher after the coal gasification furnace slag reaches the lower end, the water flow is divided into three strands at the lower end, wherein the innermost layer mainly comprises coarse slag components with larger particle sizes, the middle layer comprises coal slag with moderate particle sizes, and the outer layer comprises fine slag with smaller particle sizes, so that fine ash is obtained; the sorting principle is as follows: the fine coal gasification furnace slag is mixed with water and then pumped to a spiral sorting machine, the fine coal gasification furnace slag flows to the low end along a spiral slideway from the top along with water flow, the speed of the water flow is continuously increased in the process, the coal gasification furnace slag is graded on the slideway according to the particle size and the density under the action of centrifugal force, three notches are arranged on a chassis to respectively collect materials at the inner side, the middle part and the outer layer of the slideway, fine ash at the inner side is mainly single-particle porous hollow glass beads, middle materials are mainly porous carbon, coarse ash at the outer side is sintered glass beads or porous amorphous aluminosilicate aggregates, materials at the wind side enter a primary ash water tank, and the middle materials enter a porous carbon water tank;
pumping the coarse ash material to a 1mm screen mesh for washing, and drying the coarse ash on the screen mesh for later use;
step 2) extraction of the Fine Ash
Introducing the mixture of the outer fine slag and water into a settling tank, and adding K into the settling tank2FeO4As a flocculating agent, continuously introducing fine ash into the sedimentation tank through a water tank, and continuously adding K according to the proportion2FeO4Flocculating agent to concentrate and settle the fine ash;
s3) recovery of fine ash and filter-pressing dehydration
Pumping the concentrated grey water in the step 2) into a plate-frame refilter to extrude water to obtain a fine ash filter cake, wherein the water content is about 40-50%, and the extruded water is transmitted to a settling pond through a pipeline for recycling;
s4) further drying of the Fine Ash
S3) the fine ash filter cake is scattered and then placed in a forced air drying oven at 105 ℃ for drying for 24h, and the inherent moisture is further removed.
S5) granulating
Uniformly mixing the dried fine ash and the dried coarse ash with a binder aqueous solution, granulating on a granulator to obtain 3-4mm of ceramsite, and drying to obtain a spherical water purifying agent;
the binder comprises the following components in parts by mass:
40-60 parts of polyprenol, 20-30 parts of polybutyral and 20-40 parts of sodium silicate;
the mass ratio of the sum of the components in the aqueous solution of the binder to water is 15: 100, respectively;
40-70 parts of fine ash, 20-35 parts of coarse ash and 8-15 parts of binder aqueous solution by weight.
The coal gasification furnace slag contains a large amount of residual amorphous carbon and a part of impurities, mainly SiO2、Al2O3CaO and ash, and the impurity components do not react with water, so that new impurities cannot be introduced in the process of adsorbing impurities, heavy metal ions and the like in sewage, and the use condition of the water purifying agent is met. The invention relates to fine ash extracted from coal gasification furnace slag, belonging to an active carbon component with slightly low activity.
Example 1
A method for preparing a water purifying agent by utilizing coal gasification furnace slag comprises the following steps:
1) separating fine slag from a coal gas ash water system by using a spiral separator to respectively obtain three strands of water-containing materials, namely fine ash, porous carbon particles and coarse ash; the ignition loss of the fine ash in the fine ash material obtained after separation is 10-20%, and the ignition loss of the coarse ash in the coarse ash material is lower than 8%.
2) And pumping the coarse ash material to a screen with the diameter of 1mm for washing, drying the coarse ash on the screen for later use, and drying by adopting smoke of a rotary kiln.
Feeding the fine ash material into a settling tank, adding K2FeO4After settling and concentrating, sending the mixture to a filter press for dehydration to obtain a fine ash filter cake;
drying the fine ash filter cake after scattering, and removing the internal water in the pore structure of the microspheres;
3) uniformly mixing the dried fine ash and the dried coarse ash with a binder aqueous solution, granulating on a granulator to obtain 3-4mm of ceramsite, and drying to obtain a spherical water purifying agent;
the adhesive comprises the following components in parts by mass:
40 parts of polyprenol, 20 parts of polybutyral and 20 parts of sodium silicate;
the mass ratio of the sum of the components in the aqueous solution of the binder to water is 15: 100, respectively;
70 parts of fine ash, 35 parts of coarse ash and 15 parts of binder aqueous solution according to the mass parts.
The water purifying agent obtained in example 1 has the following test performances:
referring to fig. 2, fig. 2 is an SEM image of the sorted material of example 1, 2(a) is an SEM image of fine ash, 2(b) is an SEM image of coarse ash, and 2(c) is an SEM image of porous carbon, and it can be seen from SEM electron microscopy analysis that pores of fine ash are very developed, and when granulation, coarse ash particles are used as a skeleton, fine ash is gradually agglomerated on its surface by a binder, and the binder is rapidly solidified when dried and heated, and maintains a certain strength.
First, strength test
The water purifying agent prepared by the invention can freely fall at the height of 1.5m without disintegration, and the particles are placed in water for a period of time, so that the particles do not have the phenomena of water absorption expansion and particle disintegration, and the basic use strength of the water purifying agent is satisfied.
Second, testing the adsorption performance
The nitrogen is taken as an adsorption medium, and the test result on a full-automatic analyzer for the specific surface area and the porosity is shown in table 1, and the specific surface area and the porosity of the water purifying agent are equivalent to those of the activated carbon.
TABLE 1 comparison of specific surface area and porosity parameters of the water purifying agent obtained in example 1 with those of activated carbon
In table 2, comparing the water absorbent in table 2 with water treatment activated carbon sewage decolorization and heavy metal ion removal, iodine water, methylene blue, phenol, ammonia water and heavy metal-containing salt are respectively added into 200mL of distilled water to prepare 100ppm corresponding solution, the solution is filled into a 100mL flask, 0.5g of water purifying agent and water treatment activated carbon are respectively added, after ultrasonic vibration is carried out for 30min, the residue in the solution is determined by a titration method, the removal rates of the water purifying agent and the activated carbon on various substances are calculated, and the treatment effects of the water purifying agent and the activated carbon on simulated industrial wastewater are compared. Referring to fig. 3, fig. 3 is a comparison of before and after the adsorption of example 1, after the adsorption, the upper surface of the solution turns colorless and transparent, and has good adsorption performance.
TABLE 2 comparison of water absorbent and activated carbon for wastewater decolorization and heavy metal ion removal in water treatment
| Item | Water absorbent | Adsorption Capacity (mg/g) |
| Iodine | 99.87％ | 99.94 |
| Phenol and its preparation | 99.92％ | 99.67 |
| Methylene blue | 98.93 | 97.62 |
| NH4 + | 85.36 | 92.12 |
| Pd2+ | 64.34 | 47.44 |
| Cu2+ | 58.25 | 46.44 |
| Cd2+ | 57.63 | 47.54 |
Example 2
A method for preparing a water purifying agent by utilizing coal gasification furnace slag comprises the following steps:
1) separating fine slag from a coal gas ash water system by using a spiral separator to respectively obtain three strands of water-containing materials, namely fine ash, porous carbon particles and coarse ash; the ignition loss of the fine ash in the fine ash material obtained after separation is 10-15%, and the ignition loss of the coarse ash in the coarse ash material is lower than 3-8%.
2) And pumping the coarse ash material to a 1mm screen mesh for washing, drying the coarse ash on the screen mesh for later use, and drying by adopting microwaves.
Feeding the fine ash material into a settling tank, adding K2FeO4After settling and concentrating, sending the mixture to a filter press for dehydration to obtain a fine ash filter cake;
drying the fine ash filter cake after scattering, and removing the internal water in the pore structure of the microspheres;
3) uniformly mixing the dried fine ash and the dried coarse ash with a binder aqueous solution, granulating on a granulator to obtain 3-4mm of ceramsite, and drying to obtain a spherical water purifying agent;
the adhesive comprises the following components in parts by mass:
50 parts of polyprenol, 25 parts of polybutyral and 30 parts of sodium silicate;
the mass ratio of the sum of the components in the aqueous solution of the binder to water is 15: 100, respectively;
40 parts of fine ash, 20 parts of coarse ash and 10 parts of a binder aqueous solution by mass.
Example 3
A method for preparing a water purifying agent by utilizing coal gasification furnace slag comprises the following steps:
1) separating fine slag from a coal gas ash water system by using a spiral separator to respectively obtain three strands of water-containing materials, namely fine ash, porous carbon particles and coarse ash; the ignition loss of the fine ash in the fine ash material obtained after separation is 15-20%, and the ignition loss of the coarse ash in the coarse ash material is lower than 1-4%.
2) And pumping the coarse ash material to a screen with the diameter of 1mm for washing, drying the coarse ash on the screen for later use, and drying by adopting smoke of a rotary kiln.
Feeding the fine ash material into a settling tank, adding K2FeO4After settling and concentrating, sending the mixture to a filter press for dehydration to obtain a fine ash filter cake;
drying the fine ash filter cake after scattering, and removing the internal water in the pore structure of the microspheres;
3) uniformly mixing the dried fine ash and the dried coarse ash with a binder aqueous solution, granulating on a granulator to obtain 3-4mm of ceramsite, and drying to obtain a spherical water purifying agent;
the adhesive comprises the following components in parts by mass:
45 parts of polyhexene alcohol, 27 parts of polybutyral and 32 parts of sodium silicate;
the mass ratio of the sum of the components in the aqueous solution of the binder to water is 15: 100, respectively;
55 parts of fine ash, 33 parts of coarse ash and 13 parts of a binder aqueous solution by mass.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. A method for preparing a water purifying agent by utilizing coal gasification furnace slag is characterized by comprising the following steps:
1) separating fine slag from a coal gas ash water system by using a spiral separator to respectively obtain three strands of water-containing materials, namely fine ash, porous carbon particles and coarse ash;
2) pumping the coarse ash material to a 1mm screen mesh for washing, and drying the coarse ash on the screen mesh for later use;
sending the fine ash material into a settling tank, adding a flocculating agent for settling and concentrating, and then sending to a filter press for dehydration to obtain a fine ash filter cake;
drying the fine ash filter cake after scattering, and removing the internal water in the pore structure of the microspheres;
3) uniformly mixing the dried fine ash and the dried coarse ash with a binder aqueous solution, granulating on a granulator to obtain 3-4mm of ceramsite, and drying to obtain a spherical water purifying agent;
the adhesive comprises the following components in parts by mass:
40-60 parts of polyprenol, 20-30 parts of polybutyral and 20-40 parts of sodium silicate;
the mass ratio of the sum of the components in the aqueous solution of the binder to water is 15: 100, respectively;
the mixed mixture comprises, by mass, 40-70 parts of fine ash, 20-35 parts of coarse ash and 8-15 parts of a binder aqueous solution.
2. The method for preparing the water purifying agent by using the coal gasification slag according to claim 1, wherein the step 1) further comprises secondary sorting, and the operation is specifically as follows:
and mixing the coarse ash material and the fine ash material, then feeding the mixture into a primary ash water tank, pumping the mixture to a secondary spiral sorting machine for sorting, and obtaining three strands of water-containing materials of fine ash, porous carbon particles and coarse ash again.
3. The method for preparing the water purifying agent by utilizing the coal gasification furnace slag according to claim 1 or 2, wherein the ignition loss of the fine ash in the fine ash material obtained after the separation is 10-20%, and the ignition loss of the coarse ash in the coarse ash material is lower than 8%.
4. The method for preparing the water purifying agent by using the coal gasification slag according to claim 1, wherein the drying is performed by using the flue gas of the rotary kiln or microwaves in the step 2).
5. The method for preparing a water purifying agent by using coal gasification slag according to claim 1, wherein 12 parts of the aqueous binder solution is added during the mixing in the step 3).
6. The method for preparing water purifying agent by using coal gasification slag according to claim 1, wherein the method is characterized in thatIn step 2), the flocculant is K2FeO4。
7. A water purifying agent obtained by the method for producing a water purifying agent according to any one of claims 1 to 6.
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| CN201911018910.1A CN110624506B (en) | 2019-10-24 | 2019-10-24 | Method for preparing water purifying agent by utilizing coal gasification furnace slag and obtained water purifying agent |
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| CN111514864A (en) * | 2020-05-07 | 2020-08-11 | 滨州学院 | Organic polluted wastewater treating agent and preparation method and application method thereof |
| CN113843262A (en) * | 2021-10-07 | 2021-12-28 | 喻勇 | Rotary flushing process for coal chemical gasification slag |
| CN114368817A (en) * | 2022-01-18 | 2022-04-19 | 齐鲁工业大学 | Coal gasification coarse slag-based composite flocculant and preparation method and application thereof |
| CN114985435A (en) * | 2022-08-05 | 2022-09-02 | 中国科学院过程工程研究所 | Method for comprehensively utilizing waste salt and various solid wastes |
| CN115569645A (en) * | 2022-10-19 | 2023-01-06 | 广东佳纳能源科技有限公司 | Method and device for regenerating activated carbon |
| CN115722211A (en) * | 2022-11-24 | 2023-03-03 | 国能神东煤炭集团有限责任公司 | Phenol adsorbent and preparation method and application thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111514864A (en) * | 2020-05-07 | 2020-08-11 | 滨州学院 | Organic polluted wastewater treating agent and preparation method and application method thereof |
| CN113843262A (en) * | 2021-10-07 | 2021-12-28 | 喻勇 | Rotary flushing process for coal chemical gasification slag |
| CN114368817A (en) * | 2022-01-18 | 2022-04-19 | 齐鲁工业大学 | Coal gasification coarse slag-based composite flocculant and preparation method and application thereof |
| CN114368817B (en) * | 2022-01-18 | 2023-09-08 | 齐鲁工业大学 | Coal gasification coarse slag-based composite flocculant and preparation method and application thereof |
| CN114985435A (en) * | 2022-08-05 | 2022-09-02 | 中国科学院过程工程研究所 | Method for comprehensively utilizing waste salt and various solid wastes |
| CN115569645A (en) * | 2022-10-19 | 2023-01-06 | 广东佳纳能源科技有限公司 | Method and device for regenerating activated carbon |
| CN115569645B (en) * | 2022-10-19 | 2023-11-21 | 广东佳纳能源科技有限公司 | Method and device for regenerating active carbon |
| CN115722211A (en) * | 2022-11-24 | 2023-03-03 | 国能神东煤炭集团有限责任公司 | Phenol adsorbent and preparation method and application thereof |
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