CN104671802A - Lightweight thermal insulation refractory mortar and preparation method thereof - Google Patents

Abstract

The invention provides lightweight thermal insulation refractory mortar which consists of hollow alumina spheres, corundum fine powder, mullite fine powder, alumina fine powder and a binding agent. The invention also provides a method for preparing the lightweight thermal insulation refractory mortar. The method comprises the following steps: coating the surfaces of the hollow alumina spheres with infrared reflection sol, performing high-temperature treatment to form a highly near-infrared reflective coating layer; and preparing the refractory mortar by taking the treated hollow alumina spheres as aggregates. With the adoption of the refractory mortar disclosed by the invention, the strength and fire resistance of the refractory mortar are guaranteed, the density of the mortar is reduced, and the thermal insulation capacity of the mortar is improved.

Description

A kind of light thermal-shield refractory mud and preparation method thereof

Technical field

The present invention relates to technical field of refractory materials, particularly relate to a kind of light thermal-shield refractory mud and preparation method thereof.

Background technology

Refractory mortar is a series of high-strength fire-resistant building pointings, and mechanical erosion effect strong under being highly resistant to high temperature has air-setting and the rigid feature of fire, high strength and high refractoriness, abrasion resistance is excellent, and water-retentivity is fine, is applicable to streak method and dips in slurry method construction.But, present refractory mortar is in order to ensure fire-resistant and heat-proof quality, and general density is comparatively large, is unwell to eminence and danger zone construction, and it is higher to bear requirement to construction point two layers of material, and some low-density refractory mortares cannot ensure resistance to elevated temperatures and heat-proof quality.

Chinese patent CN102875176B discloses a kind of Refractory mortar for silicon carbide-carbon composite brick and preparation method, with silicon-carbide particle and fine powder, fine silica powder, clay, phenol-formaldehyde resin powder, carbon black for raw material, furane resin and furfuryl alcohol are bonding agent, product has good workability, dry and to burn rear cohesive strength high, but density is larger, the quality height of clay directly affects the quality of product, wayward.Chinese patent CN100548925C discloses a kind of silica fire-resistant slurry powder, forms with silica, residual silica brick, fireclay and yellow starch gum, and bonding is firm, but same density is comparatively large, nimble not.Chinese patent CN102219531B discloses strong, quick-drying refractory mortar stopping composition a kind of morning of good insulating, use fused mullite, quartz sand powder, alumina powder and pure calcium aluminate cement, add the raw materials such as Subnano-class alumina powder, silicon powder simultaneously, there is intensity good, the advantages such as consolidation rate is fast, but raw materials cost is higher, cost performance is lower slightly.

Summary of the invention

Low in order to solve light-weight refractory mud intensity, the problem of heat-proof quality difference, we have proposed a kind of light thermal-shield refractory mud and preparation method thereof, adopt the present invention effectively can improve resistance to fire intensity and the heat-proof quality of light-weight refractory mud, improve the work-ing life of refractory mortar simultaneously.

The present invention is achieved by the following technical solutions:

For achieving the above object, the invention provides a kind of light thermal-shield refractory mud, be made up of the raw material of following mass percent: alumina hollow ball: 50-80%; Corundum fine powder: 10-20%; Mullite fine powder: 10-20%; Aluminum oxide fine powder: 5-10%; Bonding agent: 5-10%; Its raw material granularity is as follows: alumina hollow ball: 4-0.1mm; Corundum fine powder: 1-0.5mm; Mullite fine powder: 1-0.5mm; Aluminum oxide fine powder: 1-0.5mm.Alumina hollow ball maximum operation (service) temperature is 1800 DEG C, and physical strength is high, has good heat-proof quality.Meanwhile, the metal oxide of fine particle size has multiple crystalline structure, and activity is very high, makes high-chrome brick inside form various crystalline structure and be combined with each other, improve stability in applied at elevated temperature process.

Preferably, above-mentioned bonding agent is made up of the raw material of following mass percent: aluminium dihydrogen phosphate: 10-20%; Dextrin: 30-80%; Lignosulfonic acid sodium solution: 20-60%.Combination under the bonding agent condition of high temperature between feed components, ensure that stablizing in sintering procedure, and facilitates the combination in sintering procedure between each crystal structure oxide.

The present invention provides a kind of preparation method of light thermal-shield refractory mud simultaneously, and step is as follows:

(1) by iron nitrate, chromium nitrate and deionized water be 1:1:5-10 wiring solution-forming in mass ratio;

(2) be 1:5-8 wiring solution-forming in mass ratio by citric acid and ethylene glycol;

(3) solution of step (2) is added in the solution of step (1) while stirring, to step (2) solution accounts for total solution quality 30-50%, be warming up to 50-90 DEG C of stirring, until form stable sol;

(4) alumina hollow ball is dipped in 10-20 minute in the colloidal sol of step (3);

(5) alumina hollow ball natural air drying 12-36 hour, to moisture lower than 0.5%;

(6) air-dry alumina hollow ball is put be warming up to 200-300 DEG C with 5-10 DEG C in an oven after be incubated 0.5-2 hour, then after 500-700 DEG C, be incubated 0.5-2 hour with identical ramp, be cooled to room temperature afterwards;

(7) test to the alumina hollow ball after process and corundum fine powder, mullite fine powder, aluminum oxide fine powder, proportioning is packed.Adopt sol gel process, at alumina hollow ball surface-coated infrared external reflection colloidal sol, through pyroprocessing, form a floor height near-infrared reflection dope layer on surface, again the alumina hollow ball after process is made refractory mortar as aggregate, greatly can improve the heat-insulating capability of mud.

Compared with prior art, beneficial effect of the present invention is:

While ensureing refractory mortar intensity and resistivity against fire, reduce mud density, improve mud heat-insulating capability.

Embodiment

Below in conjunction with embodiment, further illustrate content of the present invention.Should be appreciated that enforcement of the present invention is not limited to the following examples, any pro forma accommodation make the present invention or change all fall into scope; And the method in following embodiment, if no special instructions, be the ordinary method of this area.

Embodiment 1:

A kind of light thermal-shield refractory mud, is made up of the raw material of following mass percent: alumina hollow ball: 55%; Corundum fine powder: 15%; Mullite fine powder: 15%; Aluminum oxide fine powder: 8%; Bonding agent: 7%.

Production stage is as follows:

(1) by iron nitrate, chromium nitrate and deionized water be 1:1:5 wiring solution-forming in mass ratio;

(2) be 1:5 wiring solution-forming in mass ratio by citric acid and ethylene glycol;

(3) solution of step (2) is added in the solution of step (1) while stirring, to step (2) solution accounts for total solution quality 30%, be warming up to 60 DEG C of stirrings, until form stable sol;

(4) alumina hollow ball to be dipped in the colloidal sol of step (3) 15 minutes;

(5) alumina hollow ball natural air drying 24 hours, to moisture lower than 0.5%;

(6) air-dry alumina hollow ball is put be warming up to 250 DEG C with 8 DEG C in an oven after insulation 1 hour, then with insulation after identical ramp to 600 DEG C 1 hour, be cooled to room temperature afterwards;

(7) test to the alumina hollow ball after process and corundum fine powder, mullite fine powder, aluminum oxide fine powder, proportioning is packed.

Random sampling, detect each performance, result is as shown in table 1.

Embodiment 2:

A kind of light thermal-shield refractory mud, composition is substantially the same manner as Example 1.

Production stage is as follows:

(1) by iron nitrate, chromium nitrate and deionized water be 1:1:8 wiring solution-forming in mass ratio;

(2) be 1:8 wiring solution-forming in mass ratio by citric acid and ethylene glycol;

(3) solution of step (2) is added in the solution of step (1) while stirring, to step (2) solution accounts for total solution quality 40%, be warming up to 70 DEG C of stirrings, until form stable sol;

(4) alumina hollow ball to be dipped in the colloidal sol of step (3) 15 minutes;

(5) alumina hollow ball natural air drying 24 hours, to moisture lower than 0.5%;

(6) air-dry alumina hollow ball is put be warming up to 250 DEG C with 8 DEG C in an oven after insulation 1 hour, then with insulation after identical ramp to 600 DEG C 1 hour, be cooled to room temperature afterwards;

(7) test to the alumina hollow ball after process and corundum fine powder, mullite fine powder, aluminum oxide fine powder, proportioning is packed.

Random sampling, detect each performance, result is as shown in table 1.

Embodiment 3:

A kind of light thermal-shield refractory mud, composition is substantially the same manner as Example 1.

Production stage is as follows:

(1) by iron nitrate, chromium nitrate and deionized water be 1:1:10 wiring solution-forming in mass ratio;

(2) be 1:8 wiring solution-forming in mass ratio by citric acid and ethylene glycol;

(3) solution of step (2) is added in the solution of step (1) while stirring, to step (2) solution accounts for total solution quality 50%, be warming up to 90 DEG C of stirrings, until form stable sol;

(4) alumina hollow ball to be dipped in the colloidal sol of step (3) 15 minutes;

(5) alumina hollow ball natural air drying 24 hours, to moisture lower than 0.5%;

(6) air-dry alumina hollow ball is put be warming up to 250 DEG C with 10 DEG C in an oven after insulation 1 hour, then with insulation after identical ramp to 600 DEG C 1 hour, be cooled to room temperature afterwards;

(7) test to the alumina hollow ball after process and corundum fine powder, mullite fine powder, aluminum oxide fine powder, proportioning is packed.

Random sampling, detect each performance, result is as shown in table 1.

Comparative example:

Commercial common refractory mortar, high-temperature behavior test is carried out in random sampling, and result is as shown in table 1.

Table 1:

As can be seen from Table 1, the light thermal-shield refractory overburden content using the present invention to manufacture is low, and volume density is low, and refractoriness is high, and each temperature thermal conductivity is obvious, and comparatively comparative example is low, has good heat-insulating capability.

Claims (3)

1. a light thermal-shield refractory mud, is characterized in that, is made up of the raw material of following mass percent:

Alumina hollow ball: 50-80%;

Corundum fine powder: 10-20%;

Mullite fine powder: 10-20%;

Aluminum oxide fine powder: 5-10%;

Bonding agent: 5-10%;

Its raw material granularity is as follows:

Alumina hollow ball: 4-0.1mm;

Corundum fine powder: 1-0.5mm;

Mullite fine powder: 1-0.5mm;

Aluminum oxide fine powder: 1-0.5mm.

2. a kind of light thermal-shield refractory mud as claimed in claim 1, it is characterized in that, described bonding agent is made up of the raw material of following mass percent:

Aluminium dihydrogen phosphate: 10-20%;

Dextrin: 30-80%;

Lignosulfonic acid sodium solution: 20-60%.

3. a preparation method for light thermal-shield refractory mud, is characterized in that, step is as follows:

(1) by iron nitrate, chromium nitrate and deionized water be 1:1:5-10 wiring solution-forming in mass ratio;

(2) be 1:5-8 wiring solution-forming in mass ratio by citric acid and ethylene glycol;

(3) solution of step (2) is added in the solution of step (1) while stirring, to step (2) solution accounts for total solution quality 30-50%, be warming up to 50-90 DEG C of stirring, until form stable sol;

(4) alumina hollow ball is dipped in 10-20 minute in the colloidal sol of step (3);

(5) alumina hollow ball natural air drying 12-36 hour, to moisture lower than 0.5%;

(6) air-dry alumina hollow ball is put be warming up to 200-300 DEG C with 5-10 DEG C in an oven after be incubated 0.5-2 hour, then after 500-700 DEG C, be incubated 0.5-2 hour with identical ramp, be cooled to room temperature afterwards;

(7) test to the alumina hollow ball after process and corundum fine powder, mullite fine powder, aluminum oxide fine powder, proportioning is packed.