Coal cinder-based light thermal insulation castable and preparation method thereof

Abstract

The invention relates to the field of building materials, and discloses a coal cinder-based light thermal insulation castable and a preparation method thereof, and the coal cinder-based light thermal insulation castable is prepared from the following raw materials by mass: 50%-65% of industrial kiln coal cinder, 15%-20% of Portland cement, 8%-15% of perlite, 5%-10% of vermiculite, and 3%-5% of clay. And the application range of the temperature is 800-1000 DEG C. According to the coal cinder-based light thermal insulation castable prepared by taking the industrial kiln coal cinder and the Portland cement as main raw materials, the purchase cost of the raw materials is reduced, the effect of reducing the production cost can also be achieved, and the castable has the advantages of lower heat conductivity coefficient, low volume weight and high drying compressive strength, and is suitable for being used at the working condition temperature of 800-1000 DEG C.

Description

Technical Field

[0002] The present invention relates to the field of building materials, and in particular to a cinder-based lightweight thermal insulation castable and a preparation method thereof. Background Art

[0004] Traditional lightweight thermal insulation castables are primarily made from aluminate cement, high-alumina fines, ceramsite, and several additives. They offer lightweight properties, high compressive strength, and resistance to acid and acidic gas corrosion. However, these lightweight thermal insulation castables, primarily made from aluminate cement, high-alumina fines, and ceramsite, are expensive to produce.

[0005] Based on this, the present application provides a cinder-based lightweight thermal insulation castable suitable for 800℃~1000℃ with low production cost, low thermal conductivity, high drying compressive strength and low bulk density to solve the above problems. Summary of the Invention

[0007] The present invention aims to solve the technical problems existing in the prior art. To this end, the present invention provides a cinder-based lightweight thermal insulation castable suitable for temperatures between 800°C and 1000°C, which has low production cost, low thermal conductivity, high drying compressive strength, and low bulk density.

[0008] The technical solution adopted by the present invention to solve its technical problem is: Provided is a cinder-based lightweight thermal insulation castable, which is made of the following raw materials in percentage by mass: 50% to 65% industrial kiln cinder, 15% to 20% Portland cement, 8% to 15% perlite, 5% to 10% vermiculite, and 3% to 5% clay; the temperature range of use is 800°C to 1000°C.

[0009] In some optional embodiments, the composite material is made of the following raw materials in percentage by mass: 59% to 65% industrial kiln slag, 16% to 20% Portland cement, 10% to 15% perlite, 6% to 10% vermiculite, and 4% clay.

[0010] The preparation method of the cinder-based lightweight thermal insulation castable comprises the following steps: S1. Raw material sorting: Screen out impurities from industrial kiln slag and clay; S2. Crushing: The screened coal slag and clay are crushed into 1-3 mm particles using jaw crushers respectively; S3, grinding: grind the crushed clay into fine powder ≥200 mesh using Raymond mill for later use; S4. Mixing: Pour the crushed coal slag, ground clay powder, raw material vermiculite, raw material perlite, and raw material Portland cement into a mixer according to the set ratio and stir for 8-15 minutes. Stir and mix evenly to obtain a coal slag-based lightweight thermal insulation castable; Step S5, packaging: the mixed product is put into a plastic-lined packaging bag using an automatic filling machine.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a slag-based lightweight thermal insulation castable prepared with industrial kiln slag and silicate cement as main raw materials, which reduces the procurement cost of raw materials and can also reduce production costs. The castable has a low thermal conductivity, low bulk density, and high drying compressive strength, and is suitable for use at an operating temperature of 800°C to 1000°C. DETAILED DESCRIPTION

[0013] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] Example 1 S1. Raw material sorting: Screen out impurities from industrial kiln slag and clay; S2. Crushing: The screened coal slag and clay are crushed into 1-3 mm particles using jaw crushers respectively; S3, grinding: grind the crushed clay into fine powder ≥200 mesh using Raymond mill for later use; S4. Mixing: Mix the crushed coal slag, ground clay powder, raw vermiculite, raw perlite, and raw Portland cement according to the following mass percentages: Industrial kiln slag 50%~65%, Portland cement 15%~20%, perlite 8%~15%, vermiculite 5%~10%, clay 3%~5%; After preparation, pour it into a mixer and stir for 8-15 minutes. Stir and mix evenly to obtain a coal slag-based lightweight thermal insulation castable. Step S5, packaging: the mixed product is put into a plastic-lined packaging bag using an automatic filling machine.

[0016] After testing, the thermal conductivity of the coal slag-based lightweight insulation castable is ≤0.23W / m·K and the density is 0.6 g / cm 3 ~0.9g / cm 3 , drying compressive strength ≥2.0MPa.

[0017] Example 2 S1. Raw material sorting: Screen out impurities from industrial kiln slag and clay; S2. Crushing: The screened coal slag and clay are crushed into 1-3 mm particles using jaw crushers respectively; S3, grinding: grind the crushed clay into fine powder ≥200 mesh using Raymond mill for later use; S4. Mixing: Mix the crushed coal slag, ground clay powder, raw vermiculite, raw perlite, and raw Portland cement according to the following mass percentages: Industrial kiln slag 55%~65%, Portland cement 17%~20%, perlite 8%~12%, vermiculite 7%~10%, clay 3%; After preparation, pour it into a mixer and stir for 8-15 minutes. Stir and mix evenly to obtain a coal slag-based lightweight thermal insulation castable. Step S5, packaging: the mixed product is put into a plastic-lined packaging bag using an automatic filling machine.

[0018] After testing, the thermal conductivity of the coal slag-based lightweight insulation castable is ≤0.21W / m·K and the density is 0.7g / cm 3 ~0.9g / cm 3 , drying compressive strength ≥1.8MPa.

[0019] Example 3 S1. Raw material sorting: Screen out impurities from industrial kiln slag and clay; S2. Crushing: The screened coal slag and clay are crushed into 1-3 mm particles using jaw crushers respectively; S3, grinding: grind the crushed clay into fine powder ≥200 mesh using Raymond mill for later use; S4. Mixing: Mix the crushed coal slag, ground clay powder, raw vermiculite, raw perlite, and raw Portland cement according to the following mass percentages: Industrial kiln slag 57%~64%, Portland cement 15%~19%, perlite 10%~14%, vermiculite 6%~9%, clay 5%; After preparation, pour it into a mixer and stir for 8-15 minutes. Stir and mix evenly to obtain a coal slag-based lightweight thermal insulation castable. Step S5, packaging: the mixed product is put into a plastic-lined packaging bag using an automatic filling machine.

[0020] After testing, the thermal conductivity of the coal slag-based lightweight insulation castable is ≤0.24W / m·K and the density is 0.8 g / cm 3 ~1.0g / cm 3 , drying compressive strength ≥2.25MPa.

[0021] Example 4 S1. Raw material sorting: Screen out impurities from industrial kiln slag and clay; S2. Crushing: The screened coal slag and clay are crushed into 1-3 mm particles using jaw crushers respectively; S3, grinding: grind the crushed clay into fine powder ≥200 mesh using Raymond mill for later use; S4. Mixing: Mix the crushed coal slag, ground clay powder, raw vermiculite, raw perlite, and raw Portland cement according to the following mass percentages: Industrial kiln slag 59%~65%, Portland cement 16%~20%, perlite 10%~15%, vermiculite 6%~10%, clay 4%; After preparation, pour it into a mixer and stir for 8-15 minutes. Stir and mix evenly to obtain a coal slag-based lightweight thermal insulation castable. Step S5, packaging: the mixed product is put into a plastic-lined packaging bag using an automatic filling machine.

[0022] After testing, the thermal conductivity of the coal slag-based lightweight insulation castable is ≤0.21W / m·K and the density is 0.5 g / cm 3 ~0.7g / cm 3 , drying compressive strength ≥2.0MPa.

[0023] According to the test results, the ratio of the raw materials in Example 4 is the best.

[0024] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cinder-based lightweight thermal insulation castable, characterized in that: Made of the following raw materials in percentage by mass: Industrial kiln slag 50%~65%, Portland cement 15%~20%, perlite 8%~15%, vermiculite 5%~10%, clay 3%~5%; The operating temperature range is 800℃~1000℃.

2. The cinder-based lightweight thermal insulation castable according to claim 1, characterized in that: Made of the following raw materials in percentage by mass: Industrial kiln slag 59%~65%, Portland cement 16%~20%, perlite 10%~15%, vermiculite 6%~10%, clay 4%.

3. A method for preparing a cinder-based lightweight thermal insulation castable, characterized in that: The slag-based lightweight thermal insulation castable according to any one of claims 1 to 3 is prepared according to the following steps: S1. Raw material sorting: Screen out impurities in industrial kiln slag and clay; S2. Crushing: crush the screened coal slag and clay into 1-3 mm particles using jaw crushers; S3, grinding: grind the crushed clay into fine powder ≥200 mesh with Raymond mill for later use; S4. Mixing: Pour the crushed coal slag, ground clay powder, raw vermiculite, raw perlite and raw silicate cement into a mixer according to the set ratio and stir for 8-15 minutes. Stir and mix evenly to obtain the coal slag-based lightweight thermal insulation castable.

4. The method for preparing the cinder-based lightweight thermal insulation castable according to claim 3, characterized in that: The method further comprises step S5, packaging: the finished product that has been stirred and mixed evenly is filled into a packaging bag lined with plastic using an automatic filling machine.