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A kind of light-weight ceramsite with zinc nitrate surface aided sintering 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, increasing the proportion of ceramsite, etc., achieving low cost, ceramsite High strength and low bulk density

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

AI Technical Summary

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 light-weight ceramsite with zinc nitrate surface aided sintering and preparation method thereof
  • A kind of light-weight ceramsite with zinc nitrate surface aided sintering and preparation method thereof
  • A kind of light-weight ceramsite with zinc nitrate surface aided sintering and preparation method thereof

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preparation example Construction

[0021] see figure 1 and 2 A method for preparing lightweight ceramsite assisted by sintering on the surface of zinc nitrate 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 concentr...

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 % of the zinc nitrate aqueous solution is intermittently sprayed on the mixture, and the content of the zinc nitrate aqueous solution in the obtained raw meal balls accounts for ...

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 the zinc nitrate aqueous solution is intermittently sprayed onto the mixture, and the content of the zinc nitrate aqueous solution in the obtained raw meal balls accounts for 9% o...

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Abstract

The invention relates to zinc nitrate surface co-sintered light ceramsite and a preparation method thereof. The light ceramsite and the preparation method have the beneficial effects that by spraying a 5-25% zinc nitrate solution step by step, during drying, zinc ions dissolved in water diffuse toward the surfaces along with the moisture and gather on the shells of surfaces of raw meal nodules, the zinc ions on the surface layers react with other matters in the sintering process to form fusible matters, thus playing a role of co-sintering agents, and the content of the zinc ions in the co-sintering agents below the surface layers of the raw meal nodules is very low; the ceramsite sintered at a surface layer sintering temperature has relatively low water absorption but the unsintered density of core regions below the surface layers is relatively low, so that the light ceramsite with low water absorption and low overall density is finally obtained; the problems that the ceramsite not only requires low water absorption and high strength but also requires light volume weight are solved; the preparation method of the zinc nitrate surface co-sintered light ceramsite is simple in process and safe to operate, can be used for volume production and is low in cost.

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 zinc nitrate 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 a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B33/13
Inventor 任强王保兴武秀兰何选盟霍哲哲魏腾跃
Owner SHAANXI UNIV OF SCI & TECH
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