CN112939583B - RTO honeycomb ceramic heat accumulator prepared from bauxite tailings and preparation method thereof - Google Patents
RTO honeycomb ceramic heat accumulator prepared from bauxite tailings and preparation method thereof Download PDFInfo
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Abstract
The invention provides an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings, which comprises a base material, an additive and water, wherein the base material comprises the following components in parts by weight: 30-65 parts of bauxite tailings, 10-50 parts of chromite and 15-35 parts of fluxing agent; the additive comprises 2-5% of binder, 3-5% of lubricant, 3-5% of plasticizer and 20-24% of water. The invention realizes the high-value utilization of the bauxite tailings, reduces the problems of land occupation, environmental pollution, ecological damage and the like caused by the bauxite tailings, changes waste into valuable, has great economic and social benefits and serves the ecological civilization construction.
Description
Technical Field
The invention relates to the technical field of ceramic material preparation, in particular to an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings and a preparation method thereof.
Background
The honeycomb ceramic is used as an RTO honeycomb ceramic heat accumulator due to the advantages of large specific surface area, high heat storage capacity, good thermal shock resistance, small pressure drop, small thermal resistance, good heat conductivity, strong adaptability and the like, and is widely used for heat storage and combustion treatment of volatile organic waste gases (VOCs) in the industries of automobiles, chemical industry, petroleum, printing, medicine, coating, electric power and the like.
At present, the common material of the honeycomb ceramic heat accumulator in the common RTO device is one or a combination of more of mullite, cordierite, aluminum titanate, corundum, quartz and silicon carbide. Although the honeycomb ceramic heat accumulator is made of various materials at present, the honeycomb ceramic heat accumulator has the defects of high cost caused by expensive raw materials and high sintering temperature. For example, the honeycomb ceramic heat accumulator is obtained by using silicon carbide, mullite, kaolin and the like as main raw materials and sintering the raw materials at the temperature of 1300-1400 ℃ for 36-38 hours under the condition that the Chinese invention patent application number is 201611218000.4, and the honeycomb ceramic heat accumulator is obtained by using rare earth tailings, bauxite and mullite as main raw materials and sintering the raw materials at the temperature of 1350-1400 ℃ and preserving the heat for 2-3 hours under the condition that the Chinese invention patent application number is 201410704755.
At present, a large amount of bauxite tailings are generated every year, so that a series of problems of environmental pollution, land occupation, safe stockpiling and the like are caused, and resource waste is caused, so that great environmental benefits and economic benefits are generated by recycling the bauxite tailings.
Disclosure of Invention
Therefore, one of the purposes of the invention is to provide an RTO honeycomb ceramic heat accumulator prepared by bauxite tailings, which makes full use of industrial solid wastes such as bauxite tailings and reduces the production cost of the honeycomb ceramic heat accumulator, thereby promoting the high-value utilization of the industrial solid wastes such as bauxite tailings and the application and development of the honeycomb ceramic heat accumulator technology. The invention also aims to provide a preparation process of the RTO honeycomb ceramic heat accumulator prepared from bauxite tailings.
The invention is realized by the following technical scheme.
An RTO honeycomb ceramic heat accumulator prepared from bauxite tailings, which comprises a base material, an additive and water,
the base material is prepared from the following components in parts by weight: 30-65 parts of bauxite tailings, 10-50 parts of chromite and 15-35 parts of fluxing agent;
the additive comprises an adhesive, a lubricant and a plasticizer, wherein the adhesive accounts for 2-5% of the mass of the base material, the lubricant accounts for 3-5% of the mass of the base material, the plasticizer accounts for 3-5% of the mass of the base material, and the amount of water accounts for 20-24% of the mass of the base material.
Specifically, the particle size of each component in the base stock is below 220 meshes.
Specifically, the fluxing agent is one or more of lithium porcelain stone, permeable limestone and wollastonite.
In particular, the amount of the solvent to be used, the binder is one or a mixture of several of hydroxypropyl methyl cellulose, ethyl cellulose, carboxymethyl cellulose and polyvinyl alcohol according to any proportion.
Specifically, the lubricant is one or a mixture of several of soybean oil, tung oil, white mineral oil and yellow mineral oil in any proportion.
In particular, the plasticizer is glycerol.
Specifically, the bauxite tailings mainly comprise 35-60% of Al 2 O 3 30.00-38.16% SiO 2 4.00-15.18% Fe 2 O 3 1.00-2.00% of TiO 2 0.50-1.00% of CaO.
The invention also provides a preparation method of the RTO honeycomb ceramic heat accumulator prepared from the bauxite tailings, which comprises the following operation steps:
(1) Mixing the base material and the binder by a dry method to prepare a uniform mixture with compact packing;
(2) Then putting the uniform mixture prepared in the step (1) into a kneader, adding water, kneading for 6-8 minutes, adding a lubricant and a plasticizer, and kneading for 8-12 minutes to prepare pug;
(3) Preparing the pug prepared in the step (2) into a pug section;
(4) Extruding the mud section prepared in the step (3) into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying to obtain a blank body;
(5) And (5) cutting the blank dried in the step (4) into a fixed height, and sintering at 1070-1120 ℃ to obtain the RTO honeycomb ceramic heat accumulator.
According to the technical scheme, the beneficial effects of the invention are as follows:
1) The production cost of the honeycomb ceramic heat accumulator is greatly reduced by using bauxite tailings as a raw material;
2) The bauxite tailings are utilized in a high-value mode, the problems of land encroachment, environmental pollution, ecological damage and the like caused by the bauxite tailings are solved, waste is changed into valuable, and the bauxite tailings have great economic and social benefits and serve ecological civilization construction;
3) The bauxite tailings have high ferrotitanium content, so that the formation of a high-temperature melt is promoted, the sintering temperature of the honeycomb ceramic heat accumulator is reduced, the energy conservation and emission reduction are facilitated, and the production cost is reduced;
4) The density of the honeycomb ceramic heat accumulator prepared by the invention is 2.46g/cm 3 Even 2.89g/cm 3 High strength, axial compression strength up to 45MPa, even 52MPa, CTE of 7.25-7.82X 10 -6 The temperature per DEG C can meet the performance requirements of heat storage materials in various RTO heat storage devices.
Drawings
FIG. 1 is an SEM 500-fold micrograph of bauxite tailings under a 220 mesh screen.
FIG. 2 is a SEM 500-fold micrograph of a honeycomb ceramic heat accumulator prepared according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) According to the weight parts, 65 parts of bauxite tailing powder, 10 parts of chromite, 25 parts of lithium porcelain stone and 2% of methyl cellulose by mass of a base material are mixed by a dry method to prepare a uniform mixture with compact accumulation, wherein the base material is the bauxite tailing powder, the chromite and the lithium porcelain stone; (2) Placing the mixed uniform mixture into a kneading machine, adding water accounting for 22% by mass of the base material, kneading for 7 minutes, adding soybean oil accounting for 3% by mass of the base material and glycerol accounting for 4% by mass of the base material, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried green body into fixed height, and sintering at 1170-1120 deg.C.
Example 2
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) Mixing 55 parts of bauxite tailing powder, 15 parts of chromite, 25 parts of lithium porcelain stone and methyl cellulose accounting for 3% of the mass of a base material by a dry method according to parts by weight to prepare a uniform mixture with compact accumulation, wherein the base material is the bauxite tailing powder, the chromite and the lithium porcelain stone; (2) Placing the mixed uniform mixture into a kneading machine, adding water with the mass of 21% of the base material, kneading for 7 minutes, adding 3 parts of soybean oil and 3% of glycerol, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1070-1120 deg.C.
Example 3
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) Mixing 55 parts of bauxite tailing powder, 10 parts of chromite, 35 parts of diopside and methyl cellulose accounting for 3% of the mass of a base material by a dry method according to parts by weight to prepare a uniform mixture with compact packing, wherein the base material is the bauxite tailing powder, the chromite and the diopside; (2) Placing the mixed uniform mixture into a kneading machine, adding water accounting for 21% of the mass of the base material, kneading for 7 minutes, adding yellow mineral oil accounting for 3% of the mass of the base material and glycerol accounting for 4% of the mass of the base material, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1070-1120 deg.C.
Example 4
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) According to the weight parts, 45 parts of bauxite tailing powder, 25 parts of chromite, 30 parts of lithium porcelain stone and methyl cellulose with 4% of the mass of a base material are mixed by a dry method to prepare a uniform mixture with compact accumulation, wherein the base material is the bauxite tailing powder, the chromite and the lithium porcelain stone; (2) Placing the mixed uniform mixture into a kneading machine, adding water with the mass of 21% of the base material, kneading for 7 minutes, adding tung oil with the mass of 4% of the base material and glycerol with the mass of 4% of the base material, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1070-1120 deg.C.
Example 5
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) According to the weight parts, 35 parts of bauxite tailing powder, 30 parts of chromite, 35 parts of lithium porcelain stone and 2% of methyl cellulose by mass of a base material are mixed by a dry method to prepare a uniform mixture with compact accumulation, wherein the base material is the bauxite tailing powder, the chromite and the lithium porcelain stone; (2) Placing the mixed uniform mixture into a kneading machine, adding water with the mass of 21% of the base material, kneading for 7 minutes, adding soybean oil with the mass of 3% of the base material and glycerol with the mass of 4% of the base material, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1070-1120 deg.C.
Comparative example 1
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) According to the weight parts, 65 parts of special-grade bauxite tail, 35 parts of lithium porcelain stone and 2% of methyl cellulose by mass of base material are mixed by a dry method to prepare a uniform mixture with compact packing, wherein the base material is the special-grade bauxite tail and the lithium porcelain stone; (2) Placing the mixed uniform mixture into a kneading machine, adding water with the mass of 21% of the base material, kneading for 7 minutes, adding soybean oil with the mass of 3% of the base material and glycerol with the mass of 4% of the base material, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1070-1120 deg.C.
Comparative example 2
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) According to the weight parts, mixing 45 parts of special-grade bauxite tail, 30 parts of alumina powder, 25 parts of lithium porcelain stone and 2% of methyl cellulose by mass of a base material by a dry method to prepare a uniform mixture with compact packing, wherein the base material is the special-grade bauxite tail, the alumina powder and the lithium porcelain stone; (2) Placing the mixed uniform mixture into a kneading machine, adding water accounting for 21% of the mass of the base material, kneading for 7 minutes, adding soybean oil accounting for 3% of the mass of the base material and glycerol accounting for 4% of the mass of the base material, and kneading for 10 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1070-1120 deg.C.
Comparative example 3
A preparation method of an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings comprises the following operation steps:
(1) According to the weight parts, dry mixing 17 parts of quartz stone, 18 parts of mullite, 12 parts of cordierite, 10 parts of kaolin, 15 parts of potassium feldspar, 3 parts of silicon nitride, 4 parts of boron nitride and 3 parts of alumina, and adding 2% by mass of methyl cellulose, 1% by mass of cyanoethyl cellulose, 1% by mass of hydroxyethyl cellulose, 1% by mass of polyvinyl alcohol, 1% by mass of polyethylene oxide and 2% by mass of butanediol to obtain a uniform mixture with compact accumulation, wherein the base material is quartz stone, mullite, bluestone, kaolin, potassium feldspar, silicon nitride, boron nitride and alumina; (2) Placing the mixed uniform mixture into a kneading machine, adding water with the mass of 21% of the base material, kneading for 7 minutes, adding tung oil with the mass of 3% of the base material and glycerol with the mass of 4% of the base material, and kneading for 30 minutes; (3) refining the pug kneaded in the step (2) into pug sections; (4) Extruding the mud section with plasticity into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying; (5) Cutting the dried blank into fixed height, and sintering at 1550-1600 deg.C.
The RTO honeycomb ceramic heat accumulators prepared in the above examples and comparative examples were subjected to performance tests, and the results of the performance tests are shown in Table 1:
in order to compare the axial compressive strength of the RTO honeycomb ceramic heat accumulators prepared in the examples and comparative examples, 150mm × 150mm × 150mm honeycomb ceramic with 20 holes on one side was prepared, although the specification of the material is not limited thereto.
This patent lists some examples to illustrate the invention, and should not be construed as limiting the invention, as many modifications are possible.
It can be seen from examples 1-5 and comparative examples 1-3 that there is no big difference in properties such as CTE, axial compressive strength, bulk density, etc., the sintering temperature is reduced by 300-400 ℃ when the bauxite tailings are used for preparing the honeycomb ceramic heat accumulator, the ferrotitanium content in the bauxite tailings is higher, the formation of high-temperature melt is promoted, the sintering temperature of the honeycomb ceramic heat accumulator is reduced, the honeycomb ceramic heat accumulator is beneficial to energy conservation and emission reduction, and the production cost is reduced. In addition, the bauxite tailings are far lower in price than other ceramic raw materials, so that the production cost of the honeycomb ceramic heat accumulator is greatly reduced.
Although the present invention has been described with reference to a few preferred embodiments, it should be understood that various changes and modifications can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. An RTO honeycomb ceramic heat accumulator prepared from bauxite tailings is characterized in that the RTO honeycomb ceramic heat accumulator is prepared from a base material, an additive and water,
the base material is prepared from the following components in parts by weight: 30-65 parts of bauxite tailings, 10-50 parts of chromite and 15-35 parts of fluxing agent;
the additive comprises a binder, a lubricant and a plasticizer, wherein the binder accounts for 2-5% of the mass of the base material, the lubricant accounts for 3-5% of the base material, the plasticizer accounts for 3-5% of the base material, and the amount of water accounts for 20-24% of the base material; the bauxite tailings consist of 35-60% of Al 2 O 3 30.00-38.16% SiO 2 4.00-15.18% Fe 2 O 3 1.00-2.00% of TiO 2 0.50-1.00 percent of CaO, and the sum of all the components of the bauxite tailings is 100 percent;
the fluxing agent is one or two of spodumene and diopside.
2. The RTO honeycomb ceramic heat accumulator prepared from bauxite tailings according to claim 1, wherein the particle size of each component in the base material is below 220 meshes.
3. The RTO honeycomb ceramic heat accumulator prepared from bauxite tailings, according to claim 1, is characterized in that the lubricant is one or a mixture of several of soybean oil, tung oil, white mineral oil and yellow mineral oil according to any proportion.
4. The RTO honeycomb ceramic heat accumulator prepared from bauxite tailings of claim 1, wherein the plasticizer is glycerol.
5. A method for preparing an RTO honeycomb ceramic heat accumulator prepared from bauxite tailings as claimed in claim 1, which comprises the following steps:
(1) Mixing the base material and the binder by a dry method to prepare a uniform mixture with compact packing;
(2) Then putting the uniform mixture prepared in the step (1) into a kneader, adding water, kneading for 6-8 minutes, adding a lubricant and a plasticizer, and kneading for 8-12 minutes to prepare pug;
(3) Preparing the pug prepared in the step (2) into pug sections;
(4) Extruding the mud section prepared in the step (3) into a honeycomb structure, extruding the mud section with an outer skin, and then carrying out microwave drying to obtain a blank body;
(5) And (4) cutting the blank dried in the step (4) into a fixed height, and sintering at 1070-1120 ℃ to obtain the RTO honeycomb ceramic heat accumulator.
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