Anti-explosion refractory castable

Abstract

The application provides an explosion-proof refractory castable and relates to the technical field of refractory castables. The explosion-proof refractory castable comprises the following components in parts by mass: corundum 50-70 parts, zirconium oxide powder 20-40 parts, silicon carbide powder 10-15 parts, pure calcium aluminate cement 1-5 parts, explosion-proof agent 3-15 parts, and the castable has a permeability of (10.9-12.1) x 10 4 m 2 , and good anti-burst performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refractory castable, in particular to an explosion-proof refractory castable. BACKGROUND

[0002] The cement production process includes mine mining and transportation, raw material preparation, clinker calcination, cement grinding and packaging, wherein the raw material preparation refers to crushing and pre-homogenizing the materials mined and transported from the mine, and performing raw material grinding and homogenization according to a certain raw material ratio, and the clinker calcination includes coal powder preparation, clinker calcination and cooling.

[0003] The pre-decomposition kiln is provided with a decomposition furnace between the suspension pre-heater and the rotary kiln, or a pipe is used in the kiln tail smoke chamber, fuel is added in the pipe, the heat release process of the fuel and the endothermic decomposition process of the raw material are simultaneously and extremely rapidly performed in a suspension state or a fluidization state, so that the raw material basically completes the decomposition reaction of the carbonate before entering the rotary kiln, and thus the calcination efficiency of the kiln system is greatly improved. Therefore, the cement pre-decomposition kiln is a core equipment in the cement industry.

[0004] However, the refractory castable used for the cement pre-decomposition kiln as the core equipment in the cement industry has poor air permeability, which easily causes water vapor pressure accumulation and leads to the explosion of the castable. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present application provides an explosion-proof refractory castable, which solves the technical problem of poor explosion-proof performance of the existing refractory castable.

[0007] (II) Technical solutions

[0008] To achieve the above purpose, the present application is implemented by the following technical solutions:

[0009] An explosion-proof refractory castable comprises the following components by mass:

[0010]

[0011]

[0012] Preferably, the corundum comprises corundum aggregate with a particle size of 0.08-10 mm and corundum powder, and the mass ratio of the corundum aggregate to the corundum powder is 1:(5-10).

[0013] Preferably, the corundum powder comprises corundum powder A, corundum powder B, corundum powder C and corundum powder D with a mass ratio of (4-5):(4.5-6.5):(4-5):(5.5-6).

[0014] Preferably, the corundum powder A has a particle size greater than 10 mm and less than or equal to 11 mm, the corundum powder B has a particle size greater than 8 mm and less than or equal to 10 mm, the corundum powder C has a particle size greater than 6 mm and less than or equal to 8 mm, and the corundum powder D has a particle size less than or equal to 0.1 mm.

[0015] Preferably, the anti-explosion agent comprises azodicarbonamide and magnesium-aluminum layered double hydroxide, and the mass ratio of the azodicarbonamide to the magnesium-aluminum layered double hydroxide is 1:(2-4).

[0016] Preferably, the preparation method of the anti-explosion agent comprises the following steps:

[0017] (1) sequentially dissolving magnesium nitrate and aluminum nitrate in water to prepare a mixed salt solution, wherein the molar ratio of the magnesium nitrate to the aluminum nitrate is (2-3):1, and the concentration of the mixed salt solution is 15-17 wt%;

[0018] (2) preparing a mixed alkali solution by mixing NaOH solution and Na2CO3 solution, wherein the concentration of the NaOH solution is 10-15 wt%, the concentration of the Na2CO3 solution is 10-15 wt%, the mass ratio of the NaOH solution to the Na2CO3 solution is 1:(1-2), and the concentration of the mixed alkali solution is 10-12 wt%;

[0019] (3) simultaneously dropping the mixed salt solution and the mixed alkali solution into water, and then performing vigorous stirring and aging, and then performing filtration, washing, and drying to obtain magnesium-aluminum layered double hydroxide;

[0020] (4) uniformly mixing the magnesium-aluminum layered double hydroxide with azodicarbonamide to obtain the anti-explosion agent.

[0021] Preferably, the air permeability of the refractory castable is (10.9-12.1)×10 4 m 2 .

[0022] (III) beneficial effects

[0023] The present application provides an anti-explosion refractory castable.

[0024] Beneficial effects:

[0025] The present application designs and optimizes the structure of the water discharge channel in the anti-explosion refractory castable by using corundum with different particle sizes, thereby improving the anti-explosion performance of the castable.

[0026] The application discloses an explosion-proof refractory castable, which comprises corundum, zirconium oxide powder, silicon carbide powder, pure calcium aluminate cement and an explosion-proof agent. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] Embodiment 1

[0030] The explosion-proof refractory castable comprises the following components by mass:

[0031] The corundum is 50 parts, the zirconium oxide powder is 20 parts, the silicon carbide powder is 10 parts, the pure calcium aluminate cement is 1 part, the explosion-proof agent is 3 parts, and the water is 7 parts.

[0032] The corundum comprises corundum aggregate with a particle size of 0.08 mm and corundum powder in a mass ratio of 1:5, and the corundum powder comprises corundum powder A, corundum powder B, corundum powder C and corundum powder D in a mass ratio of 4:4.5:4:5.5, wherein the corundum powder A has a particle size of 10.5 mm, the corundum powder B has a particle size of 8.5 mm, the corundum powder C has a particle size of 6.5 mm, and the corundum powder D has a particle size of 0.1 mm.

[0033] The explosion-proof agent comprises azodicarbonamide and magnesium-aluminum layered double hydroxide, and the mass ratio of the azodicarbonamide to the magnesium-aluminum layered double hydroxide is 1:2.

[0034] The explosion-proof refractory castable is used to prepare a sample.

[0035] Firstly, corundum, zirconia powder, silicon carbide powder, pure calcium aluminate cement are mixed uniformly according to the proportion, then the explosion-proof agent is added and mixed uniformly, finally water is added for wet mixing, the obtained mixture is poured into a 40mm*40mm*160mm mold and vibrated uniformly, after curing at 60℃ for 24h, the sample for testing strength is obtained by demolding.

[0036] Firstly, corundum, zirconia powder, silicon carbide powder, pure calcium aluminate cement are mixed uniformly according to the proportion, then the explosion-proof agent is added and mixed uniformly, finally water is added for wet mixing, the obtained mixture is poured into a 40mm*40mm*160mm mold and vibrated uniformly, after curing at 60℃ for 24h, the sample for testing strength is obtained by demolding.

[0037] Example 2

[0038] The present embodiment provides an explosion-proof refractory castable, which comprises the following components by mass:

[0039] Corundum 60 parts, zirconia powder 30 parts, silicon carbide powder 12 parts, pure calcium aluminate cement 3 parts, explosion-proof agent 5 parts, water 8 parts.

[0040] Corundum includes corundum aggregate with a particle size of 2mm and corundum powder in a mass ratio of 1:6, the corundum powder includes corundum powder A, corundum powder B, corundum powder C and corundum powder D in a mass ratio of 4.5:5:4.5:5.7, the corundum powder A has a particle size of 11mm, the corundum powder B has a particle size of 9mm, the corundum powder C has a particle size of 7mm, and the corundum powder D has a particle size of 0.05mm.

[0041] The explosion-proof agent includes azodicarbonamide and magnesium-aluminum layered double hydroxide, and the mass ratio of azodicarbonamide to magnesium-aluminum layered double hydroxide is 1:2.

[0042] The preparation method of the explosion-proof agent comprises the following steps:

[0043] (1) nitric acid magnesium and nitric acid aluminum are sequentially dissolved in water to prepare a mixed salt solution, the molar ratio of nitric acid magnesium to nitric acid aluminum is 2:1, and the concentration of the mixed salt solution is 15wt%;

[0044] (2) NaOH solution and Na2CO3 solution are mixed to prepare a mixed alkali solution, the concentration of the NaOH solution is 10wt%, the concentration of the Na2CO3 solution is 10wt%, the mass ratio of the NaOH solution to the Na2CO3 solution is 1:1, and the concentration of the mixed alkali solution is 10wt%;

[0045] (3) the mixed salt solution and the mixed alkali solution are simultaneously dropped into water, and stirred vigorously, and then continue to stir and age, and then the magnesium-aluminum layered double hydroxide is obtained by filtration, washing and drying;

[0046] (4) the magnesium-aluminum layered double hydroxide is mixed with azodicarbonamide to obtain the explosion-proof agent.​

[0047] Preparation of the sample with the explosion-proof refractory castable:

[0048] First, mix corundum, zirconia powder, silicon carbide powder, and pure calcium aluminate cement according to the proportion, then add the explosion-proof agent and mix uniformly, finally add water for wet mixing. Pour the obtained mixture into a 40mm*40mm*160mm mold and vibrate uniformly. After 24h of natural curing at room temperature, demold to obtain the test sample with strength.

[0049] First, mix corundum, zirconia powder, silicon carbide powder, and pure calcium aluminate cement according to the proportion, then add the explosion-proof agent and mix uniformly, finally add water for wet mixing. Pour the obtained mixture into a 40mm*40mm*160mm mold and vibrate uniformly. After 24h of natural curing at room temperature, demold to obtain the test sample with strength.

[0050] Example 3

[0051] The present embodiment provides an explosion-proof refractory castable, which comprises the following components by mass:

[0052] Corundum 70 parts, zirconia powder 40 parts, silicon carbide powder 15 parts, pure calcium aluminate cement 5 parts, explosion-proof agent 15 parts, and water 6 parts.

[0053] The corundum includes corundum aggregate with a particle size of 10mm and corundum powder in a mass ratio of 1:10. The corundum powder includes corundum powder A, corundum powder B, corundum powder C, and corundum powder D in a mass ratio of 5:6.5:5:6. The particle size of the corundum powder A is 11mm, the particle size of the corundum powder B is 10mm, the particle size of the corundum powder C is 8mm, and the particle size of the corundum powder D is 0.1mm.

[0054] The explosion-proof agent includes azodicarbonamide and magnesium-aluminum layered double hydroxide. The mass ratio of azodicarbonamide to magnesium-aluminum layered double hydroxide is 1:4.

[0055] The preparation method of the explosion-proof agent comprises the following steps:

[0056] (1) Dissolve magnesium nitrate and aluminum nitrate in water in sequence to prepare a mixed salt solution. The molar ratio of magnesium nitrate to aluminum nitrate is 3:1, and the concentration of the mixed salt solution is 17wt%;

[0057] (2) Prepare a mixed alkali solution by mixing NaOH solution and Na2CO3 solution. The concentration of the NaOH solution is 15wt%, the concentration of the Na2CO3 solution is 15wt%, the mass ratio of the NaOH solution to the Na2CO3 solution is 1:2, and the concentration of the mixed alkali solution is 12wt%;

[0058] (3) Simultaneously drop the mixed salt solution and the mixed alkali solution into water, and stir vigorously. Continue to stir and age. After filtration, washing, and drying, magnesium-aluminum layered double hydroxide is obtained.​

[0059] (4) mixing the magnesium-aluminum layered double hydroxide and azodicarbonamide uniformly to obtain the explosion-proof agent.

[0060] Preparation of the sample with the explosion-proof refractory castable:

[0061] First, corundum, zirconia powder, silicon carbide powder, and pure calcium aluminate cement are mixed uniformly according to the proportions, then the explosion-proof agent is added and mixed uniformly, and finally water is added for wet mixing. The obtained mixture is poured into a 40mm x 40mm x 160mm mold and vibrated uniformly. After 24h of natural curing at room temperature, the sample is demolded, and the strength of the sample is tested.

[0062] First, corundum, zirconia powder, silicon carbide powder, and pure calcium aluminate cement are mixed uniformly according to the proportions, then the explosion-proof agent is added and mixed uniformly, and finally water is added for wet mixing. The obtained mixture is poured into a 40mm x 40mm x 160mm mold and vibrated uniformly. After 24h of natural curing at room temperature, the sample is demolded, and the strength of the sample is tested.

[0063] Example 4

[0064] The present embodiment provides an explosion-proof refractory castable, which comprises the following components by mass:

[0065] Corundum 69 parts, zirconia powder 38 parts, silicon carbide powder 14 parts, pure calcium aluminate cement 4 parts, explosion-proof agent 14 parts, and water 9 parts.

[0066] The corundum includes corundum aggregate with a particle size of 9.5mm and corundum powder in a mass ratio of 1:9.5. The corundum powder includes corundum powder A, corundum powder B, corundum powder C, and corundum powder D in a mass ratio of 4.8:6.2:4.9:5.9. The corundum powder A has a particle size of 11mm, the corundum powder B has a particle size of 10mm, the corundum powder C has a particle size of 8mm, and the corundum powder D has a particle size of 0.1mm.

[0067] The explosion-proof agent includes azodicarbonamide and magnesium-aluminum layered double hydroxide, and the mass ratio of azodicarbonamide to magnesium-aluminum layered double hydroxide is 1:3.9.

[0068] The preparation method of the explosion-proof agent comprises the following steps:

[0069] (1) Dissolve magnesium nitrate and aluminum nitrate in water in sequence to prepare a mixed salt solution, and the molar ratio of magnesium nitrate to aluminum nitrate is 2.9:1, and the concentration of the mixed salt solution is 16.8wt%;

[0070] (2) Prepare a mixed alkali solution by mixing NaOH solution and Na2CO3 solution, the concentration of the NaOH solution is 14.9wt%, the concentration of the Na2CO3 solution is 14.5wt%, the mass ratio of the NaOH solution to the Na2CO3 solution is 1:1.7, and the concentration of the mixed alkali solution is 11.8wt%.​

[0071] (3) the mixed salt solution and the mixed alkali solution are simultaneously dropped into water, and stirred vigorously, and the stirring is continued to age, and the magnesium-aluminum layered double hydroxide is obtained through filtering, washing, and drying;

[0072] (4) the magnesium-aluminum layered double hydroxide is uniformly mixed with azodicarbonamide to obtain the explosion-proof agent.

[0073] Preparation of a sample using the explosion-proof refractory castable:

[0074] First, corundum, zirconia powder, silicon carbide powder, and pure calcium aluminate cement are uniformly mixed according to the proportions, then the explosion-proof agent is uniformly mixed, and finally water is added for wet mixing. The obtained mixture is poured into a 40mm*40mm*160mm mold and uniformly vibrated, and after 24h of natural curing at room temperature, the sample is demolded, and the strength of the sample is tested.

[0075] First, corundum, zirconia powder, silicon carbide powder, and pure calcium aluminate cement are uniformly mixed according to the proportions, then the explosion-proof agent is uniformly mixed, and finally water is added for wet mixing. The obtained mixture is poured into a cylindrical mold and uniformly vibrated, and after 24h of curing at 60℃, the sample is demolded, and the air permeability of the sample is tested.

[0076] Comparative Example 1

[0077] The difference from Example 2 is that the explosion-proof agent is magnesium-aluminum layered double hydroxide, and the preparation method of the magnesium-aluminum layered double hydroxide comprises:

[0078] (1) magnesium nitrate and aluminum nitrate are sequentially dissolved in water to prepare a mixed salt solution, the molar ratio of magnesium nitrate to aluminum nitrate is 2:1, and the concentration of the mixed salt solution is 15wt%;

[0079] (2) NaOH solution and Na2CO3 solution are mixed to prepare a mixed alkali solution, the concentration of the NaOH solution is 10wt%, the concentration of the Na2CO3 solution is 10wt%, the mass ratio of the NaOH solution to the Na2CO3 solution is 1:1, and the concentration of the mixed alkali solution is 10wt%;

[0080] (3) the mixed salt solution and the mixed alkali solution are simultaneously dropped into water, and stirred vigorously, and the stirring is continued to age, and the magnesium-aluminum layered double hydroxide is obtained through filtering, washing, and drying;

[0081] The others are the same as in Example 2.

[0082] Comparative Example 2

[0083] The difference from Example 2 is that the explosion-proof agent is azodicarbonamide.

[0084] The others are the same as in Example 2.

[0085] Comparative Example 3

[0086] The difference from Example 2 is that no anti-detonating agent is added.

[0087] The rest is the same as Example 2.

[0088] Experimental test:

[0089] The strength of the strength samples obtained in the examples and comparative examples is measured according to GB / T 3001-2007 standard, and the results are shown in Table 1.

[0090] The cylindrical samples prepared in the examples and comparative examples are baked at 350℃, and then their air permeability under a pressure of 20kPa is tested according to GB / T3000-2016, and the results are shown in Table 1.

[0091] Table 1 Test results of samples obtained in examples and comparative examples

[0092]

[0093]

[0094] The air permeability and strength of the samples prepared in Examples 1-4 are better than those of Comparative Examples 1-3, so the use of azodicarbonamide and magnesium-aluminum layered double hydroxide as anti-detonating agent can improve the anti-detonation performance of the samples.

[0095] The anti-detonation performance of the samples in Comparative Examples 1 and 2 is worse than that in Example 2, indicating that the synergistic effect of azodicarbonamide and magnesium-aluminum layered double hydroxide improves the anti-detonation performance of the samples.

[0096] It should be noted that in this article, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0097] ​The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof refractory castable, characterized in that, The components include the following parts by weight: 50-70 parts of corundum; 20-40 parts of zirconium oxide powder; 10-15 parts of silicon carbide powder; 1-5 parts of pure calcium aluminate cement; 3-15 parts of explosion retardant; The explosion-proof agent includes: azodicarbonamide and magnesium aluminum layered double hydroxide; The mass ratio of azodicarbonamide to magnesium aluminum layered double hydroxide is 1:(2-4).

2. The explosion-proof refractory castable as described in claim 1, characterized in that, The corundum comprises corundum aggregate and corundum powder with a particle size of 0.08-10 mm, and the mass ratio of the corundum aggregate to the corundum powder is 1:(5-10). The corundum powder comprises corundum powder A, corundum powder B, corundum powder C, and corundum powder D in a mass ratio of (4-5):(4.5-6.5):(4-5):(5.5-6); The corundum powder A has a particle size greater than 10 mm and less than or equal to 11 mm, the corundum powder B has a particle size greater than 8 mm and less than or equal to 10 mm, the corundum powder C has a particle size greater than 6 mm and less than or equal to 8 mm, and the corundum powder D has a particle size less than or equal to 0.1 mm.

3. The explosion-proof refractory castable as described in claim 1, characterized in that, The preparation method of the explosion-proof agent includes the following steps: (1) Magnesium nitrate and aluminum nitrate are dissolved in water sequentially to prepare a mixed salt solution, wherein the molar ratio of magnesium nitrate to aluminum nitrate is (2-3):1, and the concentration of the mixed salt solution is 15-17 wt%. (2) Prepare a mixed alkaline solution by mixing NaOH solution and Na2CO3 solution, wherein the concentration of NaOH solution is 10-15 wt%, the concentration of Na2CO3 solution is 10-15 wt%, the mass ratio of NaOH solution to Na2CO3 solution is 1:(1-2), and the concentration of the mixed alkaline solution is 10-12 wt%. (3) The mixed salt solution and the mixed alkali solution are simultaneously added to water, stirred vigorously and aged, filtered, washed and dried to obtain magnesium aluminum layered double hydroxide; (4) The magnesium-aluminum layered double hydroxide is mixed evenly with azodicarbonamide to obtain an explosion retardant.

4. The explosion-proof refractory castable as described in claim 1, characterized in that, The air permeability of the refractory castable is (10.9-12.1)×10 4 m 2 .

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