A kind of rubber powder blended water coal slurry additive, preparation method and rubber powder blended water coal slurry

Abstract

The present invention discloses a rubber powder blended water coal slurry additive, which comprises 15-25% of polynaphthalene formaldehyde sulfonate sodium salt, 10-20% of egg white, and 0-5% of antioxidant by mass percentage, wherein the content of the antioxidant is not zero, and the rest is water. The present invention also discloses a preparation method and an application of the rubber powder blended water coal slurry additive. The rubber powder blended water coal slurry additive of the present invention can effectively improve the fluidity and reduce the viscosity of the water coal slurry blended with rubber powder mainly by adding egg white powder, and can increase the concentration of the water coal slurry blended with rubber powder under the condition of meeting the production viscosity requirement. Moreover, by using the rubber powder blended water coal slurry additive of the present invention, rubber powder can be added to the water coal slurry, and the rubber powder is the powder of waste tires, so the utilization of solid waste is realized, and a positive contribution can be made to carbon reduction. More than 50% of the rubber powder for co-firing is natural rubber, and compared with fossil fuels, the carbon emission of natural rubber is zero. After blending rubber powder, the emission of carbon dioxide can be effectively reduced.

Description

Technical Field:

[0001] The present invention relates to the technical field of coal chemical engineering, and specifically relates to a rubber powder blended water coal slurry additive, a preparation method thereof, and a rubber powder blended water coal slurry. Background Art:

[0002] Waste tires, also known as "black pollution", belong to solid waste. Due to their strong wear resistance, aging resistance, waterproof and sunscreen characteristics, waste tires are difficult to degrade. Currently, the main methods for disposing of waste tires in China are: tire retreading, making reclaimed rubber, and tire pyrolysis for oil refining. However, these disposal methods still cannot handle the large number of piled-up tires. How to improve the comprehensive utilization rate of waste tires is a difficult problem that the industry is more concerned about. Recycling and harmlessly disposing of these "solid wastes" and reusing them again is in line with public expectations and national policies.

[0003] Currently, there are technical solutions for preparing gasification water coal slurry using waste materials recorded in the literature. For example, the patent with the publication number CN111534340B records a gasification water coal slurry prepared using multi-source waste materials and a preparation method thereof. The proposal of this solution is based on the fact that when waste materials and coal or semi-coke are prepared into water coal slurry and co-disposed in a water coal slurry gasifier, the addition of waste materials to the coal / coke slurry will affect the dispersibility and fluidity of the slurry, and may also reduce the concentration of the coal / coke slurry. The reduction of dispersibility will lead to the decline of the stability of the water coal slurry, affecting the performance of the water coal slurry; the reduction of fluidity will increase the energy consumption of slurry transportation; and the low concentration of the slurry will lead to an increase in oxygen consumption during the gasification process. These problems will reduce the project benefits of co-disposing waste materials with water coal slurry gasification and increase the risk of unstable project operation. The technical means adopted in this solution is to mix 40-70% coal or semi-coke, 5-30% solid carbon-containing hydrogen waste materials, 8-38% liquid carbon-containing hydrogen waste materials, 0-1% acid-base regulator and water to prepare water coal slurry. The solid carbon-containing hydrogen waste materials are selected from one or more of waste urea-formaldehyde resin, waste formaldehyde-removing activated carbon, and formaldehyde wastewater treatment sludge; the liquid carbon-containing hydrogen waste materials are selected from one or more of sulfite pulp waste liquor, nitrocellulose cooking waste liquor, and sulfur dye wastewater. Specifically, the liquid carbon-containing hydrogen waste materials containing lignosulfonate and sulfonic acid groups are compounded with the solid carbon-containing hydrogen waste materials containing formaldehyde, and the effective components contained in them are used for reaction to carry out sulfomethylation modification on the lignin and lignosulfonate in the sulfite pulp waste liquor and nitrocellulose cooking waste liquor, generating a modified lignosulfonate dispersant, thereby effectively improving the dispersion effect of the water coal slurry.

[0004] Based on this, Inner Mongolia Yigao Coal Chemical Technology Co., Ltd. has conducted research on preparing gasification coal water slurry by blending waste tire rubber powder. The coal water slurry prepared by blending rubber powder can be co-disposed in a coal water slurry gasification furnace, which can convert carbon and hydrogen elements in waste tires into useful gases such as CO and H2. At the same time, harmful substances in waste tires are decomposed or solidified into vitreous slag, realizing the complete cleanliness of waste tire disposal and maximizing resource utilization. It is a new waste disposal method that is environmentally friendly, energy-saving, and turns waste into treasure. However, in the coal water slurry preparation technology, adding waste tires to the coal / carbon slurry will increase the viscosity of the coal water slurry. In order to reduce the viscosity, only water can be added to the coal water slurry, resulting in a decrease in the concentration of the coal water slurry.

[0005] During the preparation process of coal water slurry, it is generally necessary to add coal water slurry additives. The purpose is to increase the fluidity of the coal water slurry or increase the concentration of the coal water slurry under the condition of ensuring reasonable viscosity of the coal water slurry. At present, the commonly used coal water slurry additives at home and abroad are anionic dispersants, mainly naphthalene sulfonate additives. Through experiments, the current naphthalene sulfonate additives cannot meet the production requirements after blending rubber powder. Specifically, when blending 20-mesh rubber powder ground from waste tires into the coal water slurry, when the blending amount of rubber powder is small, it has little effect on the viscosity. However, when the blending amount of rubber powder reaches more than 10%, even if the current naphthalene sulfonate additives are added, the viscosity will increase significantly, and the viscosity index cannot reach the industry requirement of 300 mPa·s - 1200 mPa·s for coal water slurry gasification, showing poor dispersibility and caking and unable to flow. To ensure stable production operation, only water can be added to reduce the viscosity, but this method will reduce the concentration of the coal water slurry and cannot reach the normal production concentration (more than 60%) of the coal water slurry without blending rubber powder, which will reduce the synthesis gas volume of the enterprise, resulting in a decrease in the daily methanol output and affecting the economic benefits of the company. Summary of the Invention:

[0006] The first object of the present invention is to provide a rubber powder blended coal water slurry additive.

[0007] The first object of the present invention is implemented by the following technical solution: A rubber powder blended coal water slurry additive, characterized in that it comprises 15 - 25% sodium polynaphthalene formaldehyde sulfonate, 10 - 20% egg white, 0 - 5% antioxidant by mass percentage, where the content of the antioxidant is not zero, and the rest is water.

[0008] The raw materials in the water coal slurry additive can be classified into dispersants, stabilizers, antioxidants, accelerators, defoamers, pH adjusters, surface treatment agents, etc. according to their functions. Among them, the main ones are dispersants and stabilizers. The sodium salt of polynaphthalene formaldehyde sulfonate and egg white in the present invention both act as dispersants and stabilizers. As an anionic dispersant, the sodium salt of polynaphthalene formaldehyde sulfonate can effectively form a rheological body of the water coal slurry and reduce the viscosity of the water coal slurry. Adding egg white to the water coal slurry blended with rubber powder is to improve the hydrophilicity of the rubber powder surface, facilitate the dispersion of the rubber powder in water, change the current situation that the rubber powder is insoluble in water and can only float on the water surface; and improve the dispersibility of the rubber powder and coal powder, making it easier to form a slurry, and ensuring the uniform dispersion of the rubber powder and coal powder after forming the slurry, thereby reducing the viscosity and making the slurry in a flowing state.

[0009] Preferably, the antioxidant is 2,2′-methylenebis-(4-methyl-6-tert-butylphenol), and / or sodium benzoate.

[0010] The first function of the antioxidant is to effectively preserve the main components in the additive for a longer time.

[0011] Preferably, it further includes 0-5% by mass of an accelerator, and the accelerator is potassium carbonate.

[0012] The function of the accelerator is to increase the stability and strength of the additive and the water coal slurry.

[0013] Preferably, it further includes 0-15% by mass of a stabilizer, and the stabilizer is one or more of polyacrylamide flocculant, potassium carbonate, carboxymethyl cellulose, and organic bentonite.

[0014] The function of the stabilizer is to make the water coal slurry a thixotropic body. When the coal slurry stands, it generates structuring and has a high shear stress. When in use, once acted by an external force, the viscosity can rapidly decrease, having good fluidity, and can restore the original structural state when standing still again.

[0015] Preferably, it further includes 0-5% by mass of a defoamer, and the defoamer is naphthalene sulfonate, and / or tributyl phosphate.

[0016] The function of the defoamer is to remove the tiny bubbles in the water coal slurry, which can increase the fluidity, and its addition amount depends on the amount of bubbles in the water coal slurry.

[0017] Preferably, it further includes a pH adjuster to control the pH of the water coal slurry blended with rubber powder to be 9-12; the pH adjuster is sodium bicarbonate, and / or disodium hydrogen phosphate.

[0018] When preparing the water coal slurry, a weakly alkaline solution environment is better. Therefore, a pH adjuster is often added to the additive to adjust the pH value of the water coal slurry.

[0019] Preferably, it further includes a surface treatment agent with a mass percentage of 0-5%, and the surface treatment agent is sodium hydroxide and / or carbon tetrachloride.

[0020] The surface treatment agent is used to change the surface properties of coal particles to enhance their slurry-forming property.

[0021] The second object of the present invention is to provide a preparation method of a rubber powder blended water coal slurry additive.

[0022] The second object of the present invention is implemented by the following scheme: Sodium polynaphthalene formaldehyde sulfonate and egg white are respectively prepared into solutions and then mixed, and an antioxidant or an antioxidant solution is added to obtain a rubber powder blended water coal slurry additive.

[0023] Preferably, sodium polynaphthalene formaldehyde sulfonate is prepared into a solution with a mass concentration of 15-30%, egg white is prepared into a solution with a mass concentration of 10-25%, after the sodium polynaphthalene formaldehyde sulfonate solution and the egg white solution are mixed, an antioxidant or an antioxidant solution with a mass concentration of 0-5% is added to obtain a rubber powder blended water coal slurry additive.

[0024] The addition amounts of sodium polynaphthalene formaldehyde sulfonate and egg white are relatively large, so they need to be dissolved into solutions first and then mixed to avoid being in lumps and difficult to dissolve when directly preparing the solution.

[0025] There are three chemical reactions in the preparation of sodium polynaphthalene formaldehyde sulfonate in this additive:

[0026] (1) Sulfonation reaction: Methylnaphthalene is put into a rotary reaction kettle, heated and melted at the beginning of the preparation, then the stirring is started, and the temperature of the reaction kettle is raised to 130-140 °C for the methylnaphthalene sulfonation reaction. Then, a certain amount of water is added under rapid stirring, and after stirring for half an hour, a sample is taken to measure the acidity with RP-1500 acidity meter. If the total acidity is 21%-26%, it is appropriate. The reaction equation is as [1];

[0027] C 10 H8 + H2SO4 (concentrated) ==== C 10 H7(SO3H) + H2O [1]

[0028] (2) Condensation reaction: The sulfonation product is cooled to 90-100 °C, and 37% aqueous formaldehyde solution is added at one time. The temperature and pressure are naturally increased. The reaction temperature is controlled at 130-140 °C and the pressure is 0.15-0.20 MPa, and the reaction is carried out for 2 h to make it fully condensed. The reaction equation is as [2];

[0029] 2C 10 H7(SO3H) + HCHO ==== C 21 H 14 O6S2 + H2O [2]

[0030] (3) Neutralization reaction: After the condensation is completed, 30% lye is added for neutralization until the pH value is about 7. Finally, it is cooled and crystallized, filtered, and the dried crystals are sodium poly(naphthalene formaldehyde sulfonate). The reaction equation is as in [3];

[0031] C 21 H 14 O6S2 + NaOH ==== C 21 H 14 Na2O6S2 + H2O [3]

[0032] Preferably, after mixing the sodium poly(naphthalene formaldehyde sulfonate) solution and the egg white solution, a solid or solution of a quick-setting agent, and / or a stabilizer, and / or an antifoaming agent, and / or a pH adjuster, and / or a surface treatment agent is further added.

[0033] The third object of the present invention is to provide a pulverized coal blended with water slurry.

[0034] The third object of the present invention is implemented by the following technical solution: A pulverized coal blended with water slurry, the components include pulverized coal, tire rubber powder, an additive for pulverized coal blended with water slurry, and water, and the mass concentration of the pulverized coal blended with water slurry is 55 - 60%; wherein the tire rubber powder accounts for 10 - 50% of the total mass of the pulverized coal blended with water slurry, and the water slurry additive accounts for 1.5 - 3.5‰ of the total mass of the pulverized coal blended with water slurry.

[0035] Preferably, the particle size of the rubber powder is such that more than 99.9% passes through a 20 - mesh sieve; the particle size of the pulverized coal is such that more than 99.9% passes through a 14 - mesh sieve, more than 95% passes through a 20 - mesh sieve; more than 85% passes through a 40 - mesh sieve, and more than 55% passes through a 120 - mesh sieve.

[0036] When no rubber powder is blended, the particle size of the raw pulverized coal for preparing the water slurry only needs to satisfy that more than 40% passes through a 120 - mesh sieve. When less than 40% of the raw pulverized coal passes through a 120 - mesh sieve, when the viscosity of the water slurry after blending the rubber powder meets the production requirements of 300 mPa·s - 1200 mPa·s, the concentration cannot reach more than 60%. After adjusting the particle size of the pulverized coal to more than 55% passing through a 120 - mesh sieve and using the additive of the present invention, when the viscosity of the water slurry after blending the rubber powder meets the production requirements of 300 mPa·s - 1200 mPa·s, the concentration can reach more than 62%.

[0037] Advantages of the present invention:

[0038] 1. The additive for pulverized coal blended with water slurry of the present invention can effectively improve the fluidity and reduce the viscosity of the pulverized coal blended with water slurry mainly by adding egg white powder.

[0039] 2. The rubber powder blended water coal slurry additive of the present invention can increase the concentration of the water coal slurry after blending with rubber powder under the condition of meeting the production viscosity requirements.

[0040] 3. Using the rubber powder blended water coal slurry additive of the present invention, rubber powder can be added to the water coal slurry. Since the rubber powder is the powder of waste tires, the utilization of solid waste is realized, which can make a positive contribution to carbon reduction. More than 50% of the rubber powder in the co-firing is natural rubber. Compared with fossil fuels, the carbon emission of natural rubber is zero. After blending with rubber powder, the emission of carbon dioxide can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS:

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 Photo of water coal slurry additive T1;

[0043] Figure 2 Photo of water coal slurry additive T2;

[0044] Figure 3 Photo of water coal slurry additive T3;

[0045] Figure 4 Photo of water coal slurry additive T4;

[0046] Figure 5 Photo of water coal slurry additive T5;

[0047] Figure 6 Viscosity curve graph of water coal slurry in the series of S1 - S6 group numbers;

[0048] Figure 7 Photo of the fluidity experiment of water coal slurry S1 - 5;

[0049] Figure 8 Photo of the fluidity experiment of water coal slurry S2 - 5;

[0050] Figure 9 Photo of the fluidity experiment of water coal slurry S3 - 5;

[0051] Figure 10 Photo of the fluidity experiment of water coal slurry S4 - 5;

[0052] Figure 11 Photo of the fluidity experiment of water coal slurry S5 - 5;

[0053] Figure 12 It is a photo of the fluidity experiment of water coal slurry S6-5;

[0054] Figure 13 It is a viscosity curve graph of water coal slurry in the S7-S9 group number series;

[0055] Figure 14 It is a photo of the fluidity experiment of water coal slurry S7-7;

[0056] Figure 15 It is a photo of the fluidity experiment of water coal slurry S8-7;

[0057] Figure 16 It is a photo of the fluidity experiment of water coal slurry S9-7;

[0058] Figure 17 It is a photo of the fluidity experiment of water coal slurry S8-5;

[0059] Figure 18 It is a photo of the fluidity experiment of water coal slurry S9-5. Specific implementation manner:

[0060] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0061] Embodiment 1:

[0062] In this embodiment, sodium polynaphthalene formaldehyde sulfonate is an analytical pure 500g product for experiments purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. The egg white raw material is egg white powder, which is obtained by separating the egg white from the egg yolk after selecting and washing fresh eggs and then spray-drying the separated egg white. Egg white powder can also be purchased; 2,2′-methylenebis-(4-methyl-6-tert-butylphenol) is an analytical pure 500g product for experiments purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., and potassium carbonate is an analytical pure 500g product for experiments purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0063] The raw materials of the water coal slurry additive in this embodiment include 40g of sodium polynaphthalene formaldehyde sulfonate, 30g of egg white powder, 4g of antioxidant 2,2′-methylenebis-(4-methyl-6-tert-butylphenol), 4g of quick-setting agent potassium carbonate, and 122g of water.

[0064] The preparation process of the water coal slurry additive in this embodiment is as follows: First, weigh 122 g of deionized water using a 500-ml beaker on an analytical balance of model PL3002-IC. Place the weighed deionized water on an SKM-type constant temperature heater, set the temperature to 100 °C. Then, use another 500-ml beaker to weigh 40 g of polynaphthalene formaldehyde sulfonate, 30 g of egg white powder, 4 g each of antioxidant 2,2'-methylenebis(4-methyl-6-tert-butylphenol) and potassium carbonate. Slowly pour the above-mentioned chemicals into the beaker on the heater through a glass rod (stirring in small amounts and multiple times). After standing for 5 min, turn on a DW-3-120W stirrer, set the stirring speed to 500 r / min, and set the time to 20 min. Pour the prepared additive into a brown bottle for storage and name it T1.

[0065] Example 2:

[0066] The difference between this example and Example 1 is that the content of egg white in the raw materials is relatively high. Specifically, for the water coal slurry additive, there are 40 g of polynaphthalene formaldehyde sulfonate, 40 g of egg white powder, 4 g of antioxidant 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4 g of coagulant potassium carbonate, and 112 g of water.

[0067] The preparation process of the water coal slurry additive in this example is the same as that in Example 1, and the prepared water coal slurry additive is named T2. However, there are a small amount of precipitates in the prepared T2 in this example, and continuous stirring and heating cannot dissolve the precipitates.

[0068] Example 3:

[0069] The difference between this example and Example 1 is that the content of egg white in the raw materials is relatively low. Specifically, for the water coal slurry additive, there are 40 g of polynaphthalene formaldehyde sulfonate, 10 g of egg white powder, 4 g of antioxidant 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4 g of coagulant potassium carbonate, and 142 g of water.

[0070] The preparation process of the water coal slurry additive in this example is the same as that in Example 1, and the prepared water coal slurry additive is named T3.

[0071] Example 4:

[0072] The difference between this example and Example 1 is that the raw materials do not contain egg white powder. Specifically, the raw materials of the water coal slurry additive include 40 g of polynaphthalene formaldehyde sulfonate, 4 g of antioxidant 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4 g of coagulant potassium carbonate, and 152 g of water.

[0073] The preparation process of the water coal slurry additive in this example is the same as that in Example 1, and the prepared water coal slurry additive is named T4.

[0074] T1 - T4 are all prepared and used immediately in the laboratory, without involving transportation and storage. And it is only to verify the influence of egg white content on the performance of the additive, so auxiliary materials such as stabilizers, defoamers, pH adjusters and surface treatment agents are not added additionally.

[0075] Example 5

[0076] In this example, in order to verify the properties of the water - coal slurry additive, the particle size of the pulverized coal is the same as that used in the preparation of water - coal slurry without mixing rubber powder traditionally.

[0077] Using the water - coal slurry additives of Examples 1, 2, 3, 4, and an anionic liquid additive (named T5) produced by Linyi Kehua Industry and Trade Co., Ltd. purchased externally to prepare water - coal slurry. The specific process is as follows:

[0078] The coal particles taken from the front of the 702 coal - grinding section of Inner Mongolia Yigao Coal Chemical Technology Co., Ltd. are ground into pulverized coal using a small - scale conical ball mill, meeting the company's production particle size distribution (more than 90% passes through a 20 - mesh sieve; more than 80% passes through a 40 - mesh sieve, and more than 40% passes through a 120 - mesh sieve). The rubber powder is waste tire rubber powder particles purchased externally with more than 99% passing through a 20 - mesh sieve. According to the water content of the pulverized coal, the concentrations are set to 56%, 57%, 58%, 59%, 60%, 61% (for example, the calculation for the 58% concentration setting: pulverized coal = 200g * 58% * 80% / 82.3%; rubber powder = 200g * 58% * 20%; water volume = 200g pulverized coal volume+rubber powder volume; additive dosage = 200 * 3‰ = 0.6g); Conduct slurry - forming experiments on T1, T2, T3, T4, and T5 respectively. During the slurry - forming experiment, take the supernatant of T1 - T5 to make water - coal slurry; The water - coal slurry sample after T1 is slurried is named the S1 group number series, and the samples corresponding to the designed concentrations of 56%, 57%, 58%, 59%, 60%, 61% in the S1 group number series are respectively named S1 - 1, S1 - 2, …, S1 - 6; And so on;

[0079] In addition, for comparison, when preparing the water - coal slurry with rubber powder blended, no additive is added during the pulping process. The raw pulverized coal and rubber powder are the same as those in the above experiment, and after pulping, it is named the S6 group number series.

[0080] Water - coal slurry additives and water - coal slurry tests of Examples 1 - 5

[0081] 1. Additive test:

[0082] Observe the color and dissolution degree of additives T1 - T5, and the corresponding photos are attached to Figures 1 - 5 , and it can be seen from Figures 1 - 5 that Figure 2 there is precipitation. The possible reason is that the addition amount of egg white powder is too large and it cannot be dissolved, resulting in precipitation.

[0083] 2. Water - coal slurry test

[0084] Measure the concentration and viscosity of the water-coal slurries in the S1 - S6 group number series. Use the Mettler-Toledo HR83&HR83 measuring instrument to measure the concentration according to the standard of the water-coal slurry measurement method GB / T 18856.2 - 2002; use the NXS-4C viscometer to test the viscosity of the samples. Set three parallel samples for each additive at each concentration, and take the average value of the three groups of data. The concentration parameters and viscosity parameters are listed in Table 1, and the concentration and viscosity curves are attached to Figure 6 .

[0085] After the water-coal slurry preparation samples are prepared, stir them with a spatula and observe their slurring properties with the naked eye. The slurring properties are listed in Table 1. Among S1 - S6, the photos of the samples with a designed concentration of 60% are shown in Figures 7 - 12 . The evaluation criteria for slurring properties are as follows: A water-coal slurry with good slurring properties is easy to stir, has no lumps, and can flow freely after being scooped up with a spatula; a water-coal slurry with poor slurring properties is difficult to stir, has lumps, and cannot flow freely after being scooped up with a spatula.

[0086] Table 1 Concentration and Viscosity Detection Table for S1 - S6 Sample Series

[0087]

[0088]

[0089] From Table 1 and Figure 6 it can be seen that, comparing horizontally, for the water-coal slurries in the S1 - S6 group number series, as the designed concentration increases, their viscosities will increase, and the slurring properties gradually become worse; comparing vertically, among the water-coal slurries in the S1 - S6 group number series with the same designed concentration, the water-coal slurry of the S1 group number series has the lowest viscosity, and the viscosity of the S2 group number series is basically the same as that of S1. The possible reason is that in the additive T1 used in the S1 group number series, the egg white powder is saturated or nearly saturated. Although the content of egg white powder in T2 increases, the amount of egg white powder dissolved in the additive is equivalent to that in T1. Therefore, the supernatant of the additive is taken to make the water-coal slurry, and the viscosities of the water-coal slurries of the S1 and S2 group number series are close.

[0090] Comparing vertically, among the water-coal slurries with the same designed concentration, the viscosity of the water-coal slurry of the S3 group number series is greater than that of the water-coal slurries of the S1 and S2 group number series, but better than that of the water-coal slurries of the S4 and S5 group number series. Therefore, it can be judged that the addition of egg white in the additive will improve the fluidity of the water-coal slurry blended with rubber powder and reduce the viscosity, but due to the small amount of egg white powder added, its improvement effect is small.

[0091] From Figures 7 - 12 it can be seen that, comparing vertically, among the water-coal slurries with a designed concentration of 60%, the water-coal slurries of the S1, S2, and S3 group number series have good slurring properties and no lumps; while the water-coal slurries of the S4 - S6 group number series have poor slurring properties, cannot flow, and there are lumps in S6;

[0092] It can be seen that the rubber powder blended water coal slurry additive provided by the present invention can effectively reduce the viscosity when preparing the rubber powder blended water coal slurry, and the effect is remarkable.

[0093] Example 6

[0094] In order to verify the influence of the particle size of pulverized coal on the viscosity of the water coal slurry after blending with rubber powder, the water coal slurry was prepared in this example, and the specific process is as follows:

[0095] The coal particles taken from before the coal grinding section of No. 702 of Inner Mongolia Yigao Coal Chemical Technology Co., Ltd. were ground into pulverized coal using a small conical ball mill, meeting the company's production particle size distribution (more than 95% passing through a 20-mesh sieve; more than 85% passing through a 40-mesh sieve, and more than 55% passing through a 120-mesh sieve). The rubber powder is waste tire rubber powder particles purchased externally with more than 99% passing through a 20-mesh sieve. According to the water content of the pulverized coal, the concentrations are set to 56%, 57%, 58%, 59%, 60%, 61%, and 62%;

[0096] The slurry-making experiments were carried out on T1, T4, and T5. The water coal slurry samples after slurry-making of T1 were named as the S7-S9 group number series. The samples corresponding to the designed concentrations of 56%, 57%, 58%, 59%, 60%, 61%, and 62% in the S7 group number series were respectively named as S7-1, S7-2... S7-7;

[0097] The concentrations and viscosities of the S7-S9 group number series samples were detected, and the concentration parameters and viscosity parameters are listed in Table 2, and the concentration and viscosity curves are attached to Figure 13 .

[0098] The slurry-making properties of the S7-S9 group number series samples were observed, and the slurry-making properties are listed in Table 2. The photo of the sample with a designed concentration of 62% in S7 can be seen in Figures 14 - 16 , and the photos of the samples with a designed concentration of 60% in S8 and S9 can be seen in Figure 17 and Figure 18 .

[0099] Table 2 Concentration and Viscosity Detection Table of S1-S6 Sample Series

[0100]

[0101] Note: For a normal water coal slurry without blending rubber powder, only its concentration needs to be tested to determine the fluidity. However, after blending rubber powder into the water coal slurry, when the viscosity exceeds 600, simply using the viscosity to determine the fluidity of the water coal slurry cannot meet the production requirements. Therefore, we need to judge the fluidity of the water coal slurry after blending rubber powder according to our own formulated standards and agitation. This will lead to some situations where the data is appropriate but the slurry-making property is not good, which is in line with the actual situation and reasonable.

[0102] From Table 1 and Table 2 and Figure 13It can be seen that, in vertical comparison, among the coal water slurries with the same design, the viscosity of the coal water slurry in the S7 group number series is lower than that of S1, the viscosity of the coal water slurry in the S8 group number series is lower than that of S4, and the viscosity of the coal water slurry in the S9 group number series is lower than that of S5. Analyzing the reasons, after controlling the particle size distribution of the pulverized coal and increasing the passing rates of the pulverized coal through the 20-mesh sieve, 40-mesh sieve, and 120-mesh sieve, the pulverized coal can fill the voids between the rubber powder particles and better wrap around the surface of the rubber powder particles, thereby improving the fluidity and reducing the viscosity.

[0103] In addition, it can also be seen from Table 1 and Table 2 that the coal water slurry in the S1 group number series cannot form a slurry at a designed concentration of 61%, and the coal water slurries in the S4 and S5 group number series cannot form a slurry at a designed concentration of 60%; while by controlling the particle size distribution of the pulverized coal, see Figure 17 and 18 , the coal water slurries in the S8 and S9 group number series still have good slurry-forming properties at a designed concentration of 60%;

[0104] See Figures 14 - 16 , the coal water slurry in the S7 group number series still has good slurry-forming properties at a designed concentration of 62%, and the coal water slurries in the S8 and S9 group number series cannot form a slurry at a designed concentration of 62%.

[0105] Analyzed from the economic aspect, taking the methanol production line with an annual output of 200,000 tons of Inner Mongolia Yigao Coal Chemical Technology Co., Ltd. as an example, when the concentration of the coal water slurry is increased by 1%, the daily output of methanol can be increased by 25 - 30 tons, and the annual industrial output value can be increased by 15 - 18 million yuan.

[0106] Thus, by using the rubber powder blended coal water slurry additive provided by the present invention, controlling the particle size distribution of the pulverized coal, and increasing the passing rates of the pulverized coal through the 20-mesh sieve, 40-mesh sieve, and 120-mesh sieve, the viscosity of the prepared rubber powder blended coal water slurry can be effectively reduced, the fluidity can be increased, and correspondingly, the concentration of the rubber powder blended coal water slurry can be increased in production, achieving enterprise production increase and enterprise benefit increase.

[0107] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tire rubber powder blended water coal slurry additive, characterized in that, It includes sodium polynaphthalene formaldehyde sulfonate with a mass percentage of 15-25%, egg white with a mass percentage of 10-20%, and 0-5% antioxidant, where the content of the antioxidant is not zero, and the rest is water; the egg white is egg white powder, which is obtained by selecting and washing fresh eggs, separating the egg white from the egg yolk, and spray-drying the separated egg white.

2. The tire rubber powder blended water coal slurry additive according to claim 1, characterized in that, The antioxidant is 2,2′-methylenebis-(4-methyl-6-tert-butylphenol), and / or sodium benzoate.

3. The tire rubber powder blended water coal slurry additive according to claim 1, characterized in that, It further includes 0-5% quick-setting agent by mass percentage, and the quick-setting agent is potassium carbonate.

4. The tire rubber powder blended water coal slurry additive according to claim 1, characterized in that, It further includes 0-15% stabilizer by mass percentage, and the stabilizer is one or more of polyacrylamide flocculant, potassium carbonate, carboxymethyl cellulose, and organic bentonite.

5. The tire rubber powder blended water coal slurry additive according to claim 1, characterized in that, It further includes 0-5% defoamer by mass percentage, and the defoamer is naphthalene sulfonate, and / or tributyl phosphate.

6. The tire rubber powder blended water coal slurry additive according to claim 1, characterized in that, It further includes a pH adjuster to control the pH of the tire rubber powder blended water coal slurry additive to 9-12; the pH adjuster is sodium bicarbonate, and / or disodium hydrogen phosphate.

7. The tire rubber powder blended water coal slurry additive according to claim 1, characterized in that, It further includes 0-5% surface treatment agent by mass percentage, and the surface treatment agent is sodium hydroxide, and / or carbon tetrachloride.

8. The preparation method of the tire rubber powder blended water coal slurry additive according to any one of claims 1-2, characterized in that, Sodium polynaphthalene formaldehyde sulfonate and egg white are respectively formulated into solutions and then mixed, and an antioxidant is added to obtain a tire rubber powder blended water coal slurry additive.

9. The preparation method of the tire rubber powder blended water coal slurry additive according to claim 8, characterized in that, After mixing the sodium polynaphthalene formaldehyde sulfonate solution and the egg white solution, a solid or solution of a quick-setting agent, and / or a stabilizer, and / or a defoamer, and / or a pH adjuster, and / or a surface treatment agent is also added.

10. The rubber powder blended water coal slurry prepared by the tire rubber powder blended water coal slurry additive according to any one of claims 1-7, characterized in that, Its components include coal powder, tire rubber powder, a tire rubber powder blended water coal slurry additive, and water, and the mass concentration of the rubber powder blended water coal slurry is 55-60%; among them, the tire rubber powder accounts for 10-50% of the total mass of the rubber powder blended water coal slurry, and the tire rubber powder blended water coal slurry additive accounts for 1.5-3.5‰ of the total mass of the rubber powder blended water coal slurry.

11. The rubber powder blended water coal slurry according to claim 10, characterized in that, The particle size of the tire rubber powder is such that more than 99.9% passes through a 20-mesh sieve; the particle size of the coal powder is such that more than 99.9% passes through a 14-mesh sieve, more than 95% passes through a 20-mesh sieve, more than 85% passes through a 40-mesh sieve, and more than 55% passes through a 120-mesh sieve.

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