Environment-friendly corundum slurry and use method thereof

Abstract

The invention discloses environment-friendly corundum slurry and a use method thereof, and belongs to the field of unshaped refractory materials. The slurry comprises the following components in percentage by mass: 46-50% of aluminum-rich natural mineral fine aggregate; 5-6% of self-binding silica powder; the invention relates to an aluminum-rich natural mineral composite material which is prepared from the following components in percentage by weight: 16-20% of aluminum-rich natural mineral 2000-mesh micro powder, 26-30% of aluminum-rich natural mineral 200-mesh fine powder, 0.3-0.5% of dispersing agent and 0.1-0.2% of efficient plasticizing enhancer. The main material of the slurry has zero energy consumption, the proportion of natural minerals is more than 90%, the cost is reduced, and the slurry has the characteristics of low water addition amount, good compactness, high purity and the like, can synchronously damage bricks and the slurry, and has important application prospects.

Description

Technical Field

[0001] The invention belongs to the field of amorphous refractory materials, and in particular relates to an environmentally friendly corundum slurry and a use method thereof. Background Art

[0002] Refractory mud is an amorphous refractory material mainly used for laying refractory bricks. Corundum mud is a type of refractory mud with higher high temperature resistance. Traditional corundum mud is basically based on corundum powder, generally combined with aluminum dihydrogen phosphate. Traditional corundum mud has the following shortcomings: 1. Large amount of liquid added, high porosity, more low melting point substances, and poor long-term high temperature resistance; a large amount of low melting clay is added to improve the viscosity of the refractory mud, and a large amount of organic binder is added to ensure that the mud has a certain early bonding strength. These organic substances are burned at high temperatures and leave a large number of pores that seriously affect the density of the mud. 2. Due to the low activity and poor sintering properties of corundum powder itself, the mud has poor medium and low temperature sintering properties, the bonding strength with bricks under medium and low temperature conditions is low, and the load softening fluctuation is large; 3. Corundum powder is a high-energy-consuming and high-pollution product, and the power consumption per ton of corundum is nearly 2500 degrees.

[0003] Therefore, in order to improve the use effect of traditional corundum mud and achieve synchronous damage with the same level of brick lining, a low-energy, environmentally friendly corundum mud with small liquid addition volume, less low-melting point substances, better long-term high temperature resistance is studied. It is of great significance to the safe and long-life operation of masonry bodies, and is a technical problem that urgently needs to be solved in the amorphous refractory materials of the new era. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly corundum slurry and its use method in view of the shortcomings of the prior art. The slurry has zero energy consumption as the main material, reduces the cost, and has the characteristics of low water addition, good density, high purity, etc., and can make the bricks and the slurry be destroyed synchronously.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] Provided is an environmentally friendly corundum slurry, the powder composition is as follows by mass percentage:

[0007]

[0008] in:

[0009] The aluminum-rich natural mineral fine aggregate, aluminum-rich natural mineral micro-powder and aluminum-rich natural mineral fine powder are all derived from a natural mineral with extremely high aluminum oxide content and extremely low crystal water. The natural mineral contains Al2O3≥94wt%, SiO2≤3.5wt%, H2O≤1wt%, and a water absorption rate≤1.6%.

[0010] The natural mineral is a natural mineral with extremely high alumina content and extremely low crystal water content. Due to the extremely low crystal water content, it can be used directly without calcination or electric melting process. Its core indicators such as water absorption rate and aluminum content have reached the level of electric fused brown corundum.

[0011] According to the above scheme, the aluminum-rich natural mineral fine aggregate has a particle size of 0.1-0.5 mm, contains Al2O3≥94wt%, SiO2≤3.5wt%, H2O≤1%, and has a water absorption rate≤1.6%.

[0012] According to the above scheme, the aluminum-rich natural mineral 2000 mesh powder has a fineness of ≤6.5um, wherein Al2O3≥94wt%, SiO2≤3.5wt%, and H2O≤1%. The raw mineral powder of this fineness not only has good filling properties, but also has certain bonding properties.

[0013] According to the above scheme, the aluminum-rich natural mineral 200 mesh fine powder has a fineness of ≤74um; Al2O3≥94wt%, SiO2≤3.5wt%, and H2O≤1%.

[0014] According to the above scheme, the self-bonded silicon powder SiO2≥99wt%, pH value≤4, D 90 ≤0.4 microns, no need to add cations such as magnesium oxide to produce independent strong self-binding properties.

[0015] According to the above scheme, the dispersant is a mixture of polyacrylic acid liquid and alumina powder by spraying at a mass ratio of 1:3-1:4, wherein the molecular weight of the polyacrylic acid is 5000-12000.

[0016] According to the above scheme, the high-efficiency plasticizing enhancer is a powdery hyperbranched network polyethylene glycol ester ether, which has excellent bonding plasticity and can instantly transform the self-fluidizing mud into a non-flowing plastic body.

[0017] A method for using the above-mentioned environmentally friendly corundum mud is provided, and the specific steps are as follows:

[0018] First, 45-55wt% of the mud powder is fully stirred with a certain amount of water (9-10% of the total mass of the mud powder) to a very dilute state, and then the remaining mud powder is gradually added to the mixture and stirred to a preferred consistency, so that the mud reaches the best construction state.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides an environmentally friendly corundum mud, which uses a newly discovered aluminum-rich natural mineral with extremely high aluminum content, extremely low crystal water content, and extremely low water absorption as the main material. It can directly replace high-energy-consuming fused corundum as the main material of the corundum mud without sintering and electric melting. The proportion of natural minerals in the mud powder exceeds 90%, which reduces the cost.

[0021] 2. The present invention uses aluminum-rich natural minerals of different particle sizes to coordinate with each other. The aluminum-rich natural mineral fine aggregate and fine powder replace brown corundum to ensure the basic performance of the mud. The aluminum-rich natural mineral powder not only has good filling properties, but also has certain bonding properties. Together with a small amount of self-bonding silicon powder and a high-efficiency plasticizer, it provides the bonding strength of the mud, replaces the traditional binder, greatly reduces the amount of water added to the mud, reduces the porosity of the mud and the generation of low-melting phases, and improves the density and purity of the mud. At the same time, due to the filling and bonding effects of the aluminum-rich natural mineral powder, it replaces part of the strength and filling properties brought by the self-bonding silicon powder, reduces the amount of self-bonding silicon powder used, and avoids the situation where the mud solidifies too quickly and the construction time is insufficient due to excessive addition of self-bonding silicon powder.

[0022] 3. Aluminum-rich natural minerals are dehydrated at medium temperature to produce active alumina and self-bonded silica powder to generate mullite phase at a lower temperature, resulting in volume expansion, which compensates for the shrinkage caused by the dehydration of natural mineral powder and ensures the medium-temperature strength of the mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the macroscopic morphology of the natural mineral particles in the examples.

[0024] Figure 2 It is the XRD of natural mineral in the example.

[0025] Figure 3 TG-DSC of natural minerals in the examples. DETAILED DESCRIPTION

[0026] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0027] In the following embodiments:

[0028] In the embodiment of the present invention, the aluminum-rich raw ore fine aggregate, the aluminum-rich raw ore 2000 mesh powder and the aluminum-rich raw ore 200 mesh fine powder all come from a natural mineral with extremely high alumina content and extremely low crystal water, wherein the natural mineral contains Al2O3≥94wt%, SiO2≤3.5wt%, H2O≤1wt%, and water absorption rate≤1.6%. Wherein:

[0029] The aluminum-rich raw ore fine aggregate has a particle size of 0.1-0.5 mm, contains Al2O3≥94wt%, SiO2≤3.5wt%, H2O≤1%, and has a water absorption rate≤1.6%.

[0030] The aluminum-rich raw ore has a 200-mesh powder fineness of ≤74um; Al2O3≥94wt%, SiO2≤3.5wt%, and H2O≤1%.

[0031] The aluminum-rich raw ore has a 2000 mesh micro-powder fineness of ≤6.5um; and contains Al2O3≥94wt%, SiO2≤3.5wt%, and H2O≤1%.

[0032] Related tests on natural minerals, the results are as follows Figure 1-3 As shown, where:

[0033] Figure 1 This is the macroscopic morphology of natural mineral particles. It can be seen that the surface of natural mineral particles has a smooth and flat surface and obvious cleavage.

[0034] Figure 2 The XRD results of natural minerals show that the main crystal phase is Al2O3, in which there are small amounts of SiO2 and Al4O8H2. Al4O8H2 should be diaspore with -OH. The semi-quantitative results of the three are 92%, 3% and 5%.

[0035] Figure 3 This is the TG-DSC experimental result of natural minerals. It can be seen from the figure that there is obvious endothermic phenomenon and weight loss at 500-600℃. Combined with the XRD results, it can be known that it is caused by the thermal precipitation of -OH in diaspore Al4O8H2, and the maximum weight loss ratio is 0.71%.

[0036] The self-bonded silicon powder SiO2 is ≥99wt%, has a pH value of ≤4, and a volume average particle size of ≤0.3 microns.

[0037] The dispersant is prepared by spraying a mixture of polyacrylic acid liquid and alumina powder in a mass ratio of 1:3, wherein the molecular weight of the polyacrylic acid is 5000-12000 and has excellent water reducing performance.

[0038] The high-efficiency plasticizer is a powdered hyperbranched network polyethylene glycol ester ether, and the specific model is PT1088 produced by BASF of Germany.

[0039] Example 1

[0040] Provided is an environmentally friendly corundum slurry, the components of the powder and their mass percentages are:

[0041]

[0042] Weigh and fully mix the raw materials according to the above ratio; then fully stir and mix half of the mud powder with 9.4% of the total weight of the mud powder to a very dilute state, and then slowly add the remaining mud powder to the mixture and stir to a better consistency state, so that the mud reaches the best construction state. After molding, the obtained sample is naturally dried for 24 hours and then heat treated at 110°C for 24 hours to obtain an environmentally friendly corundum mud sample.

[0043] The environmentally friendly corundum mud sample prepared in this embodiment was subjected to performance testing, and the results are shown in Table 1. The performance testing method adopted is carried out in accordance with the current national standard or industry standard, and the test results obtained are the average test results of 3 times (the same below).

[0044] Table 1. Performance test results of the environmentally friendly corundum slurry sample prepared in Example 1

[0045]

[0046] Example 2

[0047] Provided is an environmentally friendly corundum slurry, the components of the powder and their mass percentages are:

[0048]

[0049]

[0050] Weigh and fully mix the raw materials according to the above ratio; then fully stir and mix half of the mud powder with 9.4% of the total weight of the mud powder to a very dilute state, and then slowly add the remaining mud powder to the mixture and stir to a better consistency state, so that the mud reaches the best construction state. After molding, the obtained sample is naturally dried for 24 hours and then heat treated at 110°C for 24 hours to obtain an environmentally friendly corundum mud sample.

[0051] The environmentally friendly corundum mud sample prepared in this embodiment was subjected to performance testing, and the results are shown in Table 2. The performance testing method adopted is carried out in accordance with the current national standard or industry standard, and the test results obtained are the average test results of 3 times (the same below).

[0052] Table 2. Performance test results of the environmentally friendly corundum slurry sample prepared in Example 2

[0053]

[0054] Example 3

[0055] Provided is an environmentally friendly corundum slurry, the components of the powder and their mass percentages are:

[0056]

[0057] Weigh and fully mix the raw materials according to the above ratio; then fully stir and mix half of the mud powder with 9.8% of the total weight of the mud powder to a very dilute state, and then slowly add the remaining mud powder to the mixture and stir until it reaches a better consistency state, so that the mud reaches the best construction state. After molding, the obtained sample is naturally dried for 24 hours and then heat treated at 110°C for 24 hours to obtain an environmentally friendly corundum mud sample.

[0058] The environmentally friendly corundum mud sample prepared in this embodiment was subjected to performance testing, and the results are shown in Table 1. The performance testing method adopted is carried out in accordance with the current national standard or industry standard, and the test results obtained are the average test results of 3 times (the same below).

[0059] Table 3. Performance test results of the environmentally friendly corundum slurry sample prepared in Example 3

[0060]

[0061]

[0062] Example 4

[0063] Provided is an environmentally friendly corundum slurry, the components of the powder and their mass percentages are:

[0064]

[0065] Weigh and fully mix the raw materials according to the above ratio; then fully stir and mix half of the mud powder with 9.5% of the total weight of the mud powder to a very dilute state, and then slowly add the remaining mud powder to the mixture and stir until it reaches a better consistency state, so that the mud reaches the best construction state. After molding, the obtained sample is naturally dried for 24 hours and then heat treated at 110°C for 24 hours to obtain an environmentally friendly corundum mud sample.

[0066] The environmentally friendly corundum mud sample prepared in this embodiment was subjected to performance testing, and the results are shown in Table 4. The performance testing method adopted is carried out in accordance with the current national standard or industry standard, and the test results obtained are the average test results of 3 times (the same below).

[0067] Table 4. Performance test results of the environmentally friendly corundum slurry sample prepared in Example 4

[0068]

[0069] The above results show that the environmentally friendly corundum slurry described in the present invention has the characteristics of low water addition, good density, high purity, etc., and can make the bricks and the slurry be destroyed synchronously.

[0070] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the invention.

Claims

1. An environmentally friendly corundum mud, It is characterized in that The powder composition is as follows by mass percentage: in: The aluminum-rich natural mineral fine aggregate, aluminum-rich natural mineral micro-powder and aluminum-rich natural mineral fine powder are all derived from a natural mineral with extremely high aluminum oxide content and extremely low crystal water content. 2 O 3 ≥94wt%SiO 2 ≤3.5wt%,H 2 O≤1wt%, water absorption≤1.6%.

2. The environmentally friendly corundum slurry according to claim 1, It is characterized in that The particle size of the aluminum-rich natural mineral fine aggregate is 0.1-0.5 mm.

3. The environmentally friendly corundum slurry according to claim 1, It is characterized in that In the self-bonded silicon powder, SiO 2 ≥99wt%, pH≤4, D 90 ≤0.4 microns.

4. The environmentally friendly corundum slurry according to claim 1, It is characterized in that The dispersant is prepared by spraying a mixture of polyacrylic acid liquid and alumina powder in a mass ratio of 1:3-1:4, wherein the molecular weight of the polyacrylic acid is 5000-12000.

5. The environmentally friendly corundum slurry according to claim 1, It is characterized in that The high-efficiency plasticizing reinforcing agent is a powdery hyperbranched network polyethylene glycol ester ether.

6. A method for using the environmentally friendly corundum slurry according to any one of claims 1 to 5, It is characterized in that The specific steps are: First, 45-55% of the mud powder and 9-10% of the water of the total weight of the mud powder are fully stirred and mixed to obtain a dilute mixture, and then the remaining mud powder is gradually added to the obtained dilute mixture and stirred to obtain mud of appropriate consistency.

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