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A kind of lightweight ceramsite assisted sintering on the surface of sodium sulfate and preparation method thereof

A surface-assisted sintering, lightweight ceramsite technology, applied in the field of new building materials, can solve the problems of reducing the heat insulation and sound insulation effect of ceramsite, reducing the sintering temperature of ceramsite, and low strength of ceramsite, and achieving low cost and strength of ceramsite. High, easy-to-control effect

Active Publication Date: 2016-02-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sintering aid is mixed evenly with the raw materials, which reduces the sintering temperature of the ceramsite, makes the ceramsite dense, increases the specific gravity of the ceramsite, reduces the heat and sound insulation effect of the ceramsite and limits the use of the ceramsite
Although inflammable ceramsite solves the problems of water absorption and heat insulation and sound insulation of ceramsite, it requires that the raw material for its production must be inflammable raw material, which is rare in nature. On the other hand, ceramsite production is at high temperature. The hollow sphere formed by puffing has high energy consumption and low strength of ceramsite. The performance and size of the product are guaranteed by the performance of the raw material, and the process is difficult to control

Method used

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  • A kind of lightweight ceramsite assisted sintering on the surface of sodium sulfate and preparation method thereof
  • A kind of lightweight ceramsite assisted sintering on the surface of sodium sulfate and preparation method thereof
  • A kind of lightweight ceramsite assisted sintering on the surface of sodium sulfate and preparation method thereof

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preparation example Construction

[0021] see figure 1 and 2 A method for preparing light-weight ceramsite assisted by sintering on the surface of sodium sulfate comprises the following steps:

[0022] 1) Take the raw materials in terms of mass percentage: 0%-65% of fly ash, 35%-95% of clay, 0-65% of ceramic waste and 0-65% of clay tailings; mix the raw materials and perform ball milling , dry and finely grind the blanks for later use; wherein the blanks with a particle size of less than 65 μm account for more than 90% of the total mass of the blanks;

[0023] 2) Mixing the blank prepared in step 1) and a pore-forming agent with a particle size of less than 0.125mm at a mass ratio of 100:(5-20) to obtain a mixture;

[0024] 3) Put the mixed material prepared in step 2) into the sugar coating machine for balling treatment to obtain raw meal balls. During the balling process, add the mixed material intermittently according to the balling situation, and in the balling process, add the mixed material with a conce...

Embodiment 1

[0034] 1) Take the raw materials in terms of mass percentage: 65% of fly ash and 35% of clay; after mixing the raw materials, carry out ball milling, drying and grinding to obtain a billet for subsequent use; wherein the billet with a particle size less than 65 μm accounts for 10% of the total mass of the billet more than 90 percent;

[0035] 2) mixing the blank prepared in step 1) with a pore-forming agent with a particle size of less than 0.125 mm at a mass ratio of 100:5 to obtain a mixture;

[0036] 3) Put the mixed material prepared in step 2) into the sugar coating machine for balling treatment to obtain raw meal balls. During the balling process, add the mixed material intermittently according to the balling situation, and in the balling process, add the mixed material with a concentration of 5 % sodium sulfate aqueous solution intermittently sprayed onto the mixture, the content of sodium sulfate aqueous solution in the obtained raw meal balls accounts for 8% of the to...

Embodiment 2

[0041] 1) Take the raw materials in terms of mass percentage: a mixture of 35% clay and 65% ceramic waste; after mixing the raw materials, perform ball milling, drying and grinding to obtain a blank for later use; wherein the blank with a particle size of less than 65 μm accounts for the total mass of the blank More than 90% of;

[0042] 2) mixing the blank prepared in step 1) with a pore-forming agent with a particle size of less than 0.125mm at a mass ratio of 100:6 to obtain a mixture;

[0043] 3) Put the mixed material prepared in step 2) into the sugar coating machine for balling treatment to obtain raw meal balls. During the balling process, add the mixed material intermittently according to the balling situation, and in the balling process, add the mixed material with a concentration of 8 % of sodium sulfate aqueous solution intermittently sprayed onto the mixture, the content of sodium sulfate aqueous solution in the obtained raw meal balls accounts for 9% of the total...

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Abstract

The invention relates to light ceramsite co-sintered on the surface by virtue of sodium sulphate and a preparation method of the light ceramsite. The preparation method of the light ceramsite co-sintered on the surface by virtue of sodium sulphate comprises the following steps: spraying a 5-25% sodium sulphate solution in steps, drying and sintering, wherein during drying, sodium ions dissolved in water diffuse toward the surface along with moisture and are enriched on a shell of the surface of each raw nodule; and during sintering, reaction is carried out on the sodium ions in the surface layer and other substances to form fusible substances, an effect of a sintering aid is realized, content of sodium ions in the sintering aid below the surface layer of each raw nodule is low, the ceramsite sintered on the surface layer at a sintering temperature is relatively low in water absorption rate while density of an unsintered core region below the surface layer is relatively low, and finally the light ceramsite with low water absorption rate and low overall density is obtained. The preparation method of the light ceramsite co-sintered on the surface by virtue of sodium sulphate has the advantages that the problems that the water absorption rate of the ceramsite is low, strength is high and volume weight is low are solved; meanwhile, a technology is simple, operation is safe, mass production can be realized, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of new building materials, and in particular relates to a lightweight ceramsite sintered on the surface of sodium sulfate and a preparation method thereof. Background technique [0002] Ceramsite is made of clay, industrial waste, waste, tailings, low-quality shale, etc., with a small amount of binder and additives, and is made into lightweight aggregate through traditional processes such as mixing, ball forming and high-temperature sintering. It is a high-quality green building material with the characteristics of light bulk density, high strength, low thermal conductivity, high refractoriness, heat preservation, antifreeze, corrosion resistance, impact resistance, earthquake resistance, wear resistance and no radiation (no harmful substances). Since the water absorption performance of ceramsite seriously affects the workability and cementation ability of ceramsite concrete, it is necessary to add sintering...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/13C04B33/132C04B33/135
CPCY02P40/60
Inventor 何选盟任强武秀兰刘辉李军奇
Owner SHAANXI UNIV OF SCI & TECH
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