Sludge coal water slurry and preparation method thereof
Through the synergistic effect of composite stabilizers and additives, the compatibility and stability issues of sludge-coal slurry have been solved, achieving harmless treatment and energy recovery of sludge, improving the fluidity and storage stability of sludge-coal slurry, reducing raw material costs, and showing broad market application prospects.
Patent Information
- Application Number
- CN202511919257.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-02-27
AI Technical Summary
Traditional sludge-coal slurry has poor compatibility and insufficient long-term storage stability, making it difficult to achieve harmless treatment and energy recovery of sludge.
A composite stabilizer is prepared by mixing additives and silica gel, and then adding a silane coupling agent. Combined with additives, a porous base material is prepared by compounding zeolite and attapulgite. Additives are prepared by methods such as Bacillus mucilaginosus fermentation to form a synergistic effect and improve the uniformity, fluidity and stability of the slurry.
It achieves long-term stable performance of sludge-coal slurry, improves ease of use and combustion thermal efficiency, reduces raw material costs, and realizes the resource utilization of industrial waste.
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Figure CN121574757A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of sludge coal-water slurry, in particular to a sludge coal-water slurry and a preparation method thereof. BACKGROUND
[0002] The sludge coal-water slurry, as a clean fuel prepared by compounding dewatered sludge, coal powder and water, has the dual advantages of harmless treatment of sludge and energy recovery, and is widely used in the combustion heating field of industrial boilers, power plants and the like.
[0003] In the prior art, the performance of the sludge coal-water slurry is often improved by adding chemical stabilizers and dispersants, however, the compatibility of the traditional single-component additives with the multiphase system of sludge, coal powder and the like is poor, and the long-term storage stability is insufficient, based on which, the present application provides a sludge coal-water slurry and a preparation method thereof. SUMMARY
[0004] The present application aims to provide a sludge coal-water slurry and a preparation method thereof, the sludge coal-water slurry prepared by the present application has long-term stability, and effectively improves the use convenience of the sludge coal-water slurry.
[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a sludge coal-water slurry is prepared from the following raw materials by weight: dewatered sludge 20-30 parts, coal powder 55-65 parts, water 22-28 parts, sodium lignosulfonate 0.3-0.8 parts, composite stabilizer 1.5-2.5 parts and additive 2.0-3.5 parts. The composite stabilizer raw material comprises an additive, silica gel and a silane coupling agent. The additive raw material comprises a base material and a composite solution.
[0006] Preferably, the composite stabilizer is prepared by the following method: S1: the additive and the silica gel are stirred at 300-500 rpm at 60-70 DEG C for 30-40 min at a mass ratio of 1: (0.3-0.7) to obtain a first mixed solution; S2: the silane coupling agent is added to the first mixed solution, and stirring is continued at 300-500 rpm for 15-20 min, and after cooling to room temperature, a composite stabilizer is obtained, wherein the mass of the silane coupling agent is 15-25% of the mass of the first mixed solution.
[0007] Preferably, the preparation method of the additive is as follows: Step one: the first fermentation liquid is mixed with a sodium alginate solution with a mass concentration of 5-10% at a volume ratio of 1: (1.5-2.5), and is activated at 35-40 DEG C for 10-14 h to obtain an activated liquid. Step two: add ethanol into the activation solution to precipitate, centrifuge at 4000-6000 rpm for 8-15 min to obtain the precipitate, wherein the volume of the ethanol is 50-100% of the volume of the first fermentation solution; Step three: dry the precipitate at 55-65℃, and crush to 180-220 mesh to obtain the additive.
[0008] Preferably, the preparation method of the first fermentation solution is as follows: take the monosodium glutamate wastewater, stir at 110-121℃ for 15-25 min, then cool to 20-30℃, stand for 10-20 min, add molasses, urea and potassium dihydrogen phosphate, stir at 100-150 rpm for 5-8 min, then adjust the pH to 6.5-7.5 with sodium hydroxide solution, transfer the mixture into a fermentation tank, inoculate with Bacillus mucilaginosus liquid, treat at 30-35℃, 150-200 rpm, 0.5-1.0vvm aeration, and 2.5-3.5 Hz oscillation, oscillate for 30-45 min every 4-6 h, cultivate for 48-60 h, and filter through a 350-450 mesh screen to obtain the first fermentation solution, wherein the effective viable concentration of the Bacillus mucilaginosus liquid is , the mass of the molasses is 3-8% of the mass of the monosodium glutamate wastewater, the mass of the urea is 1-2% of the mass of the monosodium glutamate wastewater, the volume of the Bacillus mucilaginosus liquid is 5-10% of the volume of the monosodium glutamate wastewater, and the mass of the potassium dihydrogen phosphate is 0.3-0.8% of the mass of the monosodium glutamate wastewater.
[0009] Preferably, the additive is prepared by the following method: immerse the base material in a composite solution, ultrasonic treat at room temperature for 20-40 min under an ultrasonic power of 20-40 kHz, then dry at 105-115℃ for 3-5 h, put the obtained product into a muffle furnace, calcine at 450-500℃ for 1.5-2.5 h, cool, and grind to pass through a 250-350 mesh screen to obtain the additive, wherein the mass of the composite solution is 2-3 times the mass of the base material.
[0010] Preferably, the base material is a mixture of zeolite and attapulgite with a mass ratio of (1-2) : 1, which is ground and sieved to pass through a 250-350 mesh screen.
[0011] Preferably, the composite solution is prepared by mixing a first treatment solution and a second treatment solution in a volume ratio of 1: (0.8-1.2).
[0012] Preferably, the preparation method of the first treatment solution is as follows: Step a: dissolve ferrous sulfate heptahydrate and sodium citrate in deionized water at a mass ratio of 1: (1.2-1.5) to prepare an aqueous solution with a mass concentration of 8-12%; Step b: tartaric acid is added in the aqueous solution, and the mass of the tartaric acid is 0.26-0.65% of the mass of the aqueous solution; Step c: the mixture is stirred at 200-300 rpm in a 50-60 DEG C water bath for 1-2 h, and the obtained solution is the first treatment solution.
[0013] Preferably, the preparation method of the second treatment solution is as follows: Step 1: carboxymethyl cellulose sodium is taken and added into deionized water to prepare an aqueous solution with a mass concentration of 1.5-2.5%, and the aqueous solution is stirred at 200-300 rpm at 40-50 DEG C for 15-20 min to obtain a base solution; Step 2: polyaluminum chloride is added into the base solution, and the mixture is stirred at 200-300 rpm for 5-10 min to obtain the second treatment solution, wherein the mass of the polyaluminum chloride is 2-4% of the mass of the base solution.
[0014] Preferably, a preparation method of sludge coal water slurry comprises the following steps: Step (1): according to the requirements, the dewatered sludge, coal powder, sodium lignosulfonate, composite stabilizer and additive are weighed and put into a mixer, and the mixture is mixed at 200-400 rpm for 5-10 min to obtain a first mixture; Step (2): the first mixture is transferred to a stirring kettle, and water is added, and the mixture is stirred at 800-1000 rpm for 5-10 min to obtain a second mixed slurry; Step (3): the second mixed slurry is sheared and stirred at 1500-1800 rpm for 15-25 min to obtain the sludge coal water slurry.
[0015] Compared with the prior art, the present application has the following advantages: 1. In the present application, the composite stabilizer is prepared by mixing the additive and the silica gel, and then adding the silane coupling agent, the biopolymer component in the additive and the dispersion and bonding property of the silica gel, and the interface adjustment property of the silane coupling agent form a synergistic effect, which effectively inhibits the agglomeration of solid particles in the sludge coal water slurry, improves the uniformity and fluidity of the slurry during long-term storage and transportation, avoids the problems of stratification and sedimentation, realizes the resource utilization of industrial waste, solves the shortcomings of poor compatibility of traditional coal water slurry and short-term stability of the stabilizer, and ensures the long-term stability and convenient use of the sludge coal water slurry.
[0016] 2. In the present application, the additive is prepared by compounding the base material of zeolite and attapulgite, ultrasonic immersion of the composite solution, high-temperature drying and calcination modification. The porous structure of the base material is combined with the components such as ferrous sulfate and polyaluminum chloride in the composite solution, which can not only efficiently adsorb heavy metals and harmful organic matter in the sludge, but also reduce the ignition point of the slurry, promote complete combustion, and enhance the shear resistance and uniformity of the slurry, realizing the multifunctional synergy of adsorption purification, combustion enhancement and slurry stability, and improving the combustion thermal efficiency and environmental protection of the sludge coal water slurry.
[0017] 3. In the present application, the additive is prepared by using monosodium glutamate wastewater as raw material, and is prepared by fermentation of Bacillus mucilaginosus, activation of sodium alginate, ethanol precipitation and drying and crushing. The additive can form a synergistic effect with the silica gel and silane coupling agent in the composite stabilizer, optimize the rheological properties of the slurry, improve the frost resistance and aging resistance, and realize the resource utilization of industrial wastewater, reduce the raw material cost, and the additive can also be combined firmly with other components, effectively improving the long-term stability of the composite stabilizer, and improving the interface adaptability of the sludge coal water slurry and the use system. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 A flowchart of a sludge coal water slurry preparation method is provided. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0020] It should be noted that the raw materials used in the following embodiments are all commercially available.
[0021] Embodiment 1:
[0022] A sludge coal water slurry is made from the following raw materials by weight: dewatered sludge 20 parts, coal powder 55 parts, water 22 parts, lignosulfonate sodium 0.3 parts, composite stabilizer 1.5 parts and additive 2.0 parts; The raw materials of the composite stabilizer include the additive, silica gel and silane coupling agent; The raw materials of the additive include the base material and the composite solution.
[0023] The composite stabilizer is prepared by the following method: S1: The additive and the silica gel are stirred at 300 rpm for 30 min at 60°C in a mass ratio of 1:0.3 to obtain a first mixed solution; S2: adding silane coupling agent to the first mixed solution, continuing stirring at 300 rpm for 15 min, and obtaining the composite stabilizer after cooling to room temperature, wherein the mass of the silane coupling agent is 15% of the mass of the first mixed solution.
[0024] The preparation method of the additive is as follows: Step one: mixing the first fermentation liquor and a 5% sodium alginate solution by volume ratio of 1: (1.5-2.5), standing and activating at 35℃ for 10 h, and obtaining an activated solution; Step two: adding ethanol to the activated solution for precipitation, and centrifuging at 4000 rpm for 8 min to obtain a precipitate, wherein the volume of the ethanol is 50% of the volume of the first fermentation liquor; Step three: drying the precipitate at 55℃, and crushing to 180 mesh to obtain the additive.
[0025] The preparation method of the first fermentation liquor is as follows: taking monosodium glutamate wastewater, stirring at 110℃ for 15 min, cooling to 20℃, standing for 10 min, adding molasses, urea and potassium dihydrogen phosphate, stirring at 100 rpm for 5 min, adjusting pH to 6.5 with sodium hydroxide solution, transferring the mixture into a fermentation tank, inoculating bacillus mucilaginosus liquid, treating at 30℃, 150 rpm, 0.5vvm aeration and 2.5 Hz oscillation, oscillating for 30 min every 4 h, culturing for 48 h, and filtering through a 350 mesh filter screen to obtain the first fermentation liquor, wherein the effective viable bacterial concentration of the bacillus mucilaginosus liquid is 108cfu / ml, the mass of the molasses is 3% of the mass of the monosodium glutamate wastewater, the mass of the urea is 1% of the mass of the monosodium glutamate wastewater, the volume of the bacillus mucilaginosus liquid is 5% of the volume of the monosodium glutamate wastewater, and the mass of the potassium dihydrogen phosphate is 0.3% of the mass of the monosodium glutamate wastewater.
[0026] The additive is prepared by the following method: dipping the base material in a composite solution, ultrasonic treating at 20 kHz and room temperature for 20 min, then drying at 105℃ for 3 h, putting the obtained product into a muffle furnace, calcining at 450℃ for 1.5 h, and grinding to pass through a 250 mesh screen after cooling to obtain the additive, wherein the mass of the composite solution is 2 times the mass of the base material.
[0027] The base material is prepared by mixing zeolite and attapulgite at a mass ratio of 1:1, grinding, and passing through a 250 mesh screen.
[0028] The composite solution is prepared by mixing a first treatment liquid and a second treatment liquid at a volume ratio of 1:0.8.
[0029] The preparation method of the first treatment liquid is as follows: Step a: Dissolve ferrous sulfate heptahydrate and sodium citrate in deionized water with a mass ratio of 1:1.2 to prepare an aqueous solution with a mass concentration of 8%; Step b: Add tartaric acid to the aqueous solution to obtain a mixture, wherein the mass of tartaric acid is 0.26% of the mass of the aqueous solution; Step c: Stir the mixture in a 50°C water bath at 200 rpm for 1 hour, and the obtained solution is the first treatment solution.
[0030] The preparation method of the second treatment solution is as follows: Step 1: Take sodium carboxymethyl cellulose and add deionized water to prepare an aqueous solution with a mass concentration of 1.5%, stir at 200 rpm for 15 minutes at 40°C to obtain a base solution; Step 2: Add polyaluminum chloride to the base solution and stir at 200 rpm for 5 minutes to obtain the second treatment solution, wherein the mass of polyaluminum chloride is 2% of the mass of the base solution.
[0031] A preparation method of sludge coal water slurry, comprising the following steps: Step (1): Weigh the dewatered sludge, coal powder, sodium lignosulfonate, composite stabilizer and additive according to the requirements, and put them into a mixer, mix at 200 rpm for 5 minutes to obtain a first mixture; Step (2): Transfer the first mixture to a stirred tank, add water, and stir at 800 rpm for 5 minutes to obtain a second mixed slurry; Step (3): Shear stir the second mixed slurry at 1500 rpm for 15 minutes to obtain the sludge coal water slurry.
[0032] Example 2:
[0033] A sludge coal water slurry is made from the following raw materials by weight: dewatered sludge 25 parts, coal powder 60 parts, water 25 parts, sodium lignosulfonate 0.5 parts, composite stabilizer 2 parts and additive 3 parts; The composite stabilizer raw material includes additive, silica gel and silane coupling agent; The additive raw material includes base material and composite solution.
[0034] The composite stabilizer is prepared by the following method: S1: Stir the additive and silica gel at a mass ratio of 1:0.5 at 400 rpm for 35 minutes at 65°C to obtain a first mixed solution; S2: Add silane coupling agent to the first mixed solution, continue to stir at 400 rpm for 18 minutes, and cool to room temperature to obtain the composite stabilizer, wherein the mass of the silane coupling agent is 20% of the mass of the first mixed solution.
[0035] The preparation method of the additive is as follows: Step one: the first fermentation liquor is mixed with a 7% sodium alginate solution by volume ratio 1:2, and is activated at 37°C for 12 hours to obtain an activated solution; Step two: ethanol is added to the activated solution for precipitation, and the precipitate is obtained by centrifugation at 5000 rpm for 12 minutes, wherein the volume of ethanol is 75% of the volume of the first fermentation liquor; Step three: the precipitate is dried at 60°C, and is crushed to 200 mesh to obtain the additive.
[0036] The preparation method of the first fermentation liquor is as follows: the monosodium glutamate wastewater is stirred at 116°C for 20 minutes, and is cooled to 25°C, and is left to stand for 15 minutes, and then the molasses, urea and potassium dihydrogen phosphate are added, and the mixture is stirred at 125 rpm for 6 minutes, and then the pH is adjusted to 7.0 with a sodium hydroxide solution, and then the mixture is transferred into a fermentation tank, and the bacillus mucilaginosus bacterial solution is inoculated, and is treated at 32°C, 175 rpm, 0.7vvm and 3.0 Hz, and is oscillated for 37 minutes every 5 hours, and is cultured for 54 hours, and then the filtrate obtained by filtering through a 400 mesh filter is the first fermentation liquor, wherein the effective viable bacterial concentration of the bacillus mucilaginosus bacterial solution is , the mass of the molasses is 5% of the mass of the monosodium glutamate wastewater, the mass of the urea is 1.5% of the mass of the monosodium glutamate wastewater, the volume of the bacillus mucilaginosus bacterial solution is 8% of the volume of the monosodium glutamate wastewater, and the mass of the potassium dihydrogen phosphate is 0.5% of the mass of the monosodium glutamate wastewater.
[0037] The additive is prepared by the following method: the base material is immersed in a composite solution, and is ultrasonically treated at an ultrasonic power of 30 kHz and room temperature for 30 minutes, and then is dried at 110°C for 4 hours, and then the obtained product is put into a muffle furnace, and is calcined at 475°C for 2.0 hours, and then is ground to pass through a 300 mesh sieve after cooling to obtain the additive, wherein the mass of the composite solution is 2.5 times the mass of the base material.
[0038] The base material is prepared by mixing zeolite and attapulgite at a mass ratio of 1.5:1, grinding and then passing through a 300 mesh sieve.
[0039] The composite solution is prepared by mixing a first treatment solution and a second treatment solution at a volume ratio of 1:1.0.
[0040] The preparation method of the first treatment solution is as follows: Step a: ferrous sulfate heptahydrate and sodium citrate are dissolved in deionized water at a mass ratio of 1:1.3 to prepare a 10% aqueous solution; Step b: tartaric acid is added to the aqueous solution to obtain a mixture, wherein the mass of the tartaric acid is 0.45% of the mass of the aqueous solution; Step c: the mixture was stirred at 55℃ in water bath for 1.5h at 250rpm, and the obtained solution was the first treatment solution.
[0041] The preparation method of the second treatment solution is as follows: Step 1: sodium carboxymethyl cellulose was taken and added into deionized water to prepare a 2.0% mass concentration aqueous solution, which was stirred at 250rpm at 45℃ for 18min to obtain a base solution; Step 2: polyaluminum chloride was added into the base solution, which was stirred at 250rpm for 8min to obtain the second treatment solution, wherein the mass of the polyaluminum chloride was 3% of the mass of the base solution.
[0042] A preparation method of sludge coal water slurry comprises the following steps: Step (1): according to the requirements, the dewatered sludge, coal powder, sodium lignosulfonate, composite stabilizer and additive were weighed and put into a mixer, and mixed at 300rpm for 8min to obtain a first mixture; Step (2): the first mixture was transferred to a stirring kettle, and water was added, which was stirred at 900rpm for 8min to obtain a second mixed slurry; Step (3): the second mixed slurry was sheared and stirred at 1650rpm for 20min to obtain the sludge coal water slurry.
[0043] Example 3:
[0044] A sludge coal water slurry is made of the following raw materials by weight: dewatered sludge 30 parts, coal powder 65 parts, water 28 parts, sodium lignosulfonate 0.8 parts, composite stabilizer 2.5 parts and additive 3.5 parts; The composite stabilizer raw material comprises additive, silica gel and silane coupling agent; The additive raw material comprises base material and composite solution.
[0045] The composite stabilizer is prepared by the following method: S1: the additive and the silica gel were mixed at a mass ratio of 1:0.7 at 70℃ and stirred at 500rpm for 40min to obtain a first mixed solution; S2: the silane coupling agent was added into the first mixed solution, which was continuously stirred at 500rpm for 20min, and then cooled to room temperature to obtain the composite stabilizer, wherein the mass of the silane coupling agent was 25% of the mass of the first mixed solution.
[0046] The preparation method of the additive is as follows: Step one: the first fermentation solution was mixed with a 10% mass concentration sodium alginate solution at a volume ratio of 1:2.5, and was activated at 40℃ for 14h to obtain an activated solution; Step two: precipitate is obtained by adding ethanol into the activation solution and centrifuging at 6000 rpm for 15 min, wherein the volume of ethanol is 100% of the volume of the first fermentation solution; Step three: the precipitate is dried at 65℃ and ground to 220 mesh to obtain the additive.
[0047] The preparation method of the first fermentation solution is as follows: the monosodium glutamate wastewater is stirred at 121℃ for 25 min, cooled to 30℃, and then left to stand for 20 min; the molasses, urea and potassium dihydrogen phosphate are added and stirred at 150 rpm for 8 min; the pH is adjusted to 7.5 with sodium hydroxide solution; the mixture is transferred into a fermentation tank and inoculated with bacillus mucilaginosus liquid; the culture is treated at 35℃, 200 rpm, 1.0vvm aeration and 3.5 Hz oscillation, and oscillated for 45 min every 6 h; the culture is incubated for 60 h; and the obtained filtrate after filtering through a 450 mesh filter is the first fermentation solution, wherein the effective viable concentration of the bacillus mucilaginosus liquid is , the mass of the molasses is 8% of the mass of the monosodium glutamate wastewater, the mass of the urea is 2% of the mass of the monosodium glutamate wastewater, the volume of the bacillus mucilaginosus liquid is 10% of the volume of the monosodium glutamate wastewater, and the mass of the potassium dihydrogen phosphate is 0.8% of the mass of the monosodium glutamate wastewater.
[0048] The additive is prepared by the following method: the base material is immersed in a composite solution with a mass of 3 times that of the base material, ultrasonically treated at an ultrasonic power of 40 kHz and room temperature for 40 min, then dried at 115℃ for 5 h, the obtained product is put into a muffle furnace and calcined at 500℃ for 2.5 h, and then ground to pass through a 350 mesh sieve after cooling to obtain the additive.
[0049] The base material is prepared by mixing zeolite and attapulgite at a mass ratio of 2:1, grinding and then passing through a 350 mesh sieve.
[0050] The composite solution is prepared by mixing a first treatment solution and a second treatment solution at a volume ratio of 1:1.2.
[0051] The preparation method of the first treatment solution is as follows: Step a: ferrous sulfate heptahydrate and sodium citrate are dissolved in deionized water at a mass ratio of 1:1.5 to prepare an aqueous solution with a mass concentration of 12%; Step b: tartaric acid is added to the aqueous solution to obtain a mixture, wherein the mass of the tartaric acid is 0.65% of the mass of the aqueous solution; Step c: the mixture is stirred at 300 rpm in a 60℃ water bath for 2 h, and the obtained solution is the first treatment solution.
[0052] The preparation method of the second treatment solution is as follows: Step 1: Take sodium carboxymethyl cellulose, add deionized water to prepare a 2.5% mass concentration aqueous solution, stir at 300 rpm at 50°C for 20 min to obtain a base solution; Step 2: Add polyaluminum chloride to the base solution, stir at 300 rpm for 10 min to obtain a second treatment solution, wherein the mass of polyaluminum chloride is 4% of the mass of the base solution.
[0053] A sludge coal-water slurry preparation method comprises the following steps: Step (1): Weigh the dewatered sludge, coal powder, sodium lignosulfonate, composite stabilizer and additive according to the requirements, and put them into a mixer, mix at 400 rpm for 10 min to obtain a first mixture; Step (2): Transfer the first mixture to a stirred tank, add water, and stir at 1000 rpm for 10 min to obtain a second mixed slurry; Step (3): Shear stir the second mixed slurry at 1800 rpm for 25 min to obtain the sludge coal-water slurry.
[0054] Comparative Example 1, the difference between this comparative example and Example 1 is that this comparative example does not contain a composite stabilizer.
[0055] Comparative Example 2, the difference between this comparative example and Example 1 is that this comparative example does not contain an additive Comparative Example 3, the difference between this comparative example and Example 1 is that the additive is not added when preparing the composite stabilizer in this comparative example.
[0056] Performance test: The sludge coal-water slurry provided by Examples 1-3 and Comparative Examples 1-3 is tested for performance, and the test data are recorded in the following table: Table 1
[0057] In the performance test, the apparent viscosity is tested according to GB / T18856.4-2008, which is a key indicator of slurry flowability, and the lower the viscosity, the more conducive to transportation. The stability is tested according to GB / T18856.5-2008, which is evaluated by measuring the water separation rate or sedimentation of the slurry, and the lower the percentage, the more uniform and stable the slurry, and the less likely to stratify. The low calorific value is tested according to GB / T213-2008, which directly reflects the energy value of the fuel, and the higher the value, the more heat released during combustion. These standardized test methods provide a scientific basis for objectively evaluating the comprehensive performance of sludge coal-water slurry.
[0058] From the performance test data, it can be clearly seen that the sludge coal-water slurry prepared in Examples 1, 2 and 3 is significantly better than the comparative examples in terms of apparent viscosity, stability and low calorific value. Specifically, the viscosity of the comparative example 1 is as high as 1500 mPa·s, the stability is degraded to 18.5%, and the calorific value is the lowest, proving that the composite stabilizer is crucial for maintaining the uniformity of the slurry, preventing sedimentation and ensuring fluidity. The performance of the comparative example 2 also declines, indicating that the additive plays a key role in adsorbing harmful substances and promoting combustion to increase the calorific value. The performance of the comparative example 3 is between that of the comparative example 1 and the examples, indicating that the additive derived from monosodium glutamate wastewater effectively optimizes the rheological properties of the slurry and enhances the long-term stability effect by synergizing with the silica gel.
[0059] In summary, the sludge coal-water slurry provided by the present application has multiple significant advantages. First, it successfully solves the technical bottlenecks of high viscosity, easy sedimentation and poor stability of traditional sludge coal-water slurry through the synergistic effect of the composite stabilizer and the additive, making it have good fluidity and storage stability. Second, this technology not only realizes the reduction and harmless treatment of sludge, but also recycles the energy of organic matter, giving it a high low calorific value and high degree of resource utilization. Finally, the present application innovatively uses industrial waste such as monosodium glutamate wastewater as raw material to improve product performance, which has a broad market application prospect.
[0060] Through comparison and analysis of the relevant data in the table, it can be seen that the sludge coal-water slurry prepared by the present application not only has a low apparent viscosity and excellent stability, but also has a high low calorific value. This indicates that the sludge coal-water slurry provided by the present application not only ensures good fluidity and storage stability, but also realizes the utilization of sludge, has a broader market prospect, and is more suitable for promotion.
[0061] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0062] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and get the best results from the application. The application is only limited by the claims and their full scope and equivalents.
Claims
1. A sludge-coal slurry, characterized in that, It is made from the following raw materials in parts by weight: 20-30 parts dewatered sludge, 55-65 parts coal powder, 22-28 parts water, 0.3-0.8 parts sodium lignosulfonate, 1.5-2.5 parts composite stabilizer and 2.0-3.5 parts additives; The raw materials for the composite stabilizer include additives, silica gel, and silane coupling agents; The additive raw materials include base material and composite solution.
2. The sludge-coal slurry according to claim 1, characterized in that, The composite stabilizer is prepared by the following method: S1: Mix the additives and silicone gel at a mass ratio of 1:(0.3-0.7) at 60-70℃ and 300-500rpm for 30-40min to obtain the first mixture; S2: Add silane coupling agent to the first mixture, continue stirring at 300-500 rpm for 15-20 min, and cool to room temperature to obtain a composite stabilizer, wherein the mass of the silane coupling agent is 15-25% of the mass of the first mixture.
3. The sludge-coal slurry according to claim 2, characterized in that, The preparation method of the additive is as follows: Step 1: Mix the first fermentation broth with a 5-10% sodium alginate solution at a volume ratio of 1:(1.5-2.5), and let it stand at 35-40℃ for 10-14 hours to activate it, thus obtaining the activated solution; Step 2: Add ethanol to the activation solution to precipitate the precipitate, and centrifuge at 4000-6000 rpm for 8-15 min to obtain the precipitate. The volume of the ethanol is 50-100% of the volume of the first fermentation broth. Step 3: Dry the precipitate at 55-65℃ and pulverize it to 180-220 mesh to obtain the additive.
4. The sludge-coal slurry according to claim 3, characterized in that, The preparation method of the first fermentation broth is as follows: Take monosodium glutamate wastewater, stir at 110-121℃ for 15-25 min, cool to 20-30℃, let stand for 10-20 min, add molasses, urea and potassium dihydrogen phosphate, stir at 100-150 rpm for 5-8 min, then adjust the pH to 6.5-7.5 with sodium hydroxide solution, transfer the mixture to a fermenter, inoculate with Bacillus mucilaginosus culture, and treat with shaking at 2.5-3.5 Hz at 30-35℃, 150-200 rpm, and an aeration rate of 0.5-1.0 vvm, shaking for 30-45 min every 4-6 h, and culture for 48-60 h. The filtrate obtained after filtration through a 350-450 mesh filter is the first fermentation broth, wherein the effective viable bacteria concentration of the Bacillus mucilaginosus culture is [missing information]. The molasses content is 3-8% of the MSG wastewater volume, the urea content is 1-2% of the MSG wastewater volume, the Bacillus mucilaginosus liquid volume is 5-10% of the MSG wastewater volume, and the potassium dihydrogen phosphate content is 0.3-0.8% of the MSG wastewater volume.
5. The sludge-coal slurry according to claim 1, characterized in that, The additive is prepared by the following method: the base material is impregnated in a composite solution, ultrasonically treated at room temperature with an ultrasonic power of 20-40 kHz for 20-40 min, and then dried at 105-115℃ for 3-5 h. The resulting product is then placed in a muffle furnace and calcined at 450-500℃ for 1.5-2.5 h. After cooling, it is ground until it passes through a 250-350 mesh sieve to obtain the additive. The mass of the composite solution is 2-3 times the mass of the base material.
6. The sludge-coal slurry according to claim 5, characterized in that, The base material is obtained by mixing and grinding zeolite and attapulgite in a mass ratio of (1-2):1 and then passing them through a 250-350 mesh sieve.
7. The sludge-coal slurry according to claim 5, characterized in that, The composite solution is formed by mixing the first treatment solution and the second treatment solution at a volume ratio of 1:(0.8-1.2).
8. The sludge-coal slurry according to claim 7, characterized in that, The preparation method of the first treatment solution is as follows: Step a: Dissolve ferrous sulfate heptahydrate and sodium citrate together in deionized water at a mass ratio of 1:(1.2-1.5) to prepare an aqueous solution with a mass concentration of 8-12%. Step b: Add tartaric acid to the aqueous solution to obtain a mixture, wherein the mass of the tartaric acid is 0.26-0.65% of the mass of the aqueous solution; Step c: Stir the mixture in a water bath at 50-60℃ at 200-300 rpm for 1-2 hours. The resulting solution is the first treatment solution.
9. The sludge-coal slurry according to claim 7, characterized in that, The preparation method of the second treatment solution is as follows: Step 1: Take sodium carboxymethyl cellulose and add it to deionized water to prepare an aqueous solution with a mass concentration of 1.5-2.5%. Stir at 200-300 rpm for 15-20 minutes at 40-50℃ to obtain the base solution. Step 2: Add polyaluminum chloride to the base solution and stir at 200-300 rpm for 5-10 minutes to obtain the second treatment solution. The mass of polyaluminum chloride is 2-4% of the mass of the base solution.
10. The method for preparing sludge-coal slurry according to any one of claims 1-9, characterized in that, Includes the following steps: Step (1): Weigh out the dewatered sludge, coal powder, sodium lignosulfonate, composite stabilizer and additives as needed and put them into the mixer. Mix them at 200-400 rpm for 5-10 minutes to obtain the first mixture. Step (2): Transfer the first mixture to a mixing tank, add water, and stir at 800-1000 rpm for 5-10 minutes to obtain the second mixture slurry; Step (3): The second mixed slurry is sheared and stirred at 1500-1800 rpm for 15-25 min to obtain the sludge-coal slurry.