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A method for preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls

A silicate and pre-hydration technology, used in ceramic products, manufacturing tools, ceramic molding machines, etc., can solve the problems of poor bonding performance, high sintering temperature, and great influence on the performance of ceramsite, and achieve performance improvement, Significant performance

Active Publication Date: 2021-07-30
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Slag is a barren material with very poor bonding performance. Generally, 20% to 25% of binders (shale, clay, etc.) need to be mixed with slag powder to produce ceramsite to prevent the ball from rolling and improve the ball forming efficiency. 1. Ensure that the raw meal ball has a certain initial strength, and the addition of a large amount of binder has a great influence on the performance of ceramsite; in addition, the current preparation process of ceramsite in my country is mainly sintering and swelling method, and the Al in slag 2 o 3 Therefore, the sintering temperature for preparing slag ceramsite is relatively high, and the energy consumption is large

Method used

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  • A method for preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls
  • A method for preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls
  • A method for preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In this embodiment, the mixture ratio data is as above Table 1, combined with figure 1 , the process of preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls according to the present invention is as follows:

[0062] Mixing ratio of ceramsite core mixture: cement 15wt%, slag powder 65wt%, water 15wt%, diatomite 5wt%, wherein cement and water are mixed according to the ratio of 1:1 and retarder (0.1% of cement content) is made. into pre-hydrated cement slurry for later use;

[0063] Mixing ratio of ceramsite shell mixture: 15wt% of cement and 85wt% of fly ash are uniformly mixed to make a shell mixture for use, and the amount of the shell mixture is 4% of the mass of the inner core mixture.

[0064] Step 1: Preparation and prehydration of cement slurry

[0065] Put 150kg of cement, 150kg of water and 0.15kg of retarder in the mixing tank and stir at a stirring rate of 10-15r / min, stirring for 1-2 hours, and wait until the c...

Embodiment 2

[0079] In this embodiment, the mixture ratio data is as above Table 1, combined with figure 1 , the process of preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls according to the present invention is as follows:

[0080] Mixing ratio of ceramsite core mixture: cement 20%, slag powder 52%, water 20%, diatomite 8%, wherein cement and water are mixed according to the ratio of 1:1 and retarder (0.15% of cement content) is made into pre-hydrated cement slurry for later use;

[0081] Mixing ratio of ceramsite shell mixture: 15% of cement and 85% of fly ash are evenly mixed to make a shell mixture for later use, and the addition amount of the shell mixture is 5% of the mass of the inner core.

[0082] Step 1: Preparation and prehydration of cement slurry

[0083] Put 200kg of cement, 200kg of water and 0.3kg of retarder in the mixing tank and stir at a stirring rate of 10-15r / min, stirring for 1-2 hours, and wait until the cement slu...

Embodiment 3

[0097] In this embodiment, the mixture ratio data is as above Table 1, combined with figure 1 , the process of preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls according to the present invention is as follows:

[0098] Mixing ratio of ceramsite core mixture: cement 25%, slag powder 40%, water 25%, diatomite 10%, wherein cement and water are mixed according to the ratio of 1:1 and retarder (0.2% of cement content) is made into pre-hydrated cement slurry for later use;

[0099] Mixing ratio of ceramsite shell mixture: 15% of cement and 85% of fly ash are evenly mixed to make a shell mixture for use, and the amount of the shell mixture is 6% of the mass of the inner core.

[0100] Step 1: Preparation and prehydration of cement slurry

[0101] Put 250kg of cement, 250kg of water and 0.5kg of retarder in the mixing tank and stir at a stirring rate of 10-15r / min, stirring for 1-2 hours, and wait until the cement slurry is pre-hydr...

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Abstract

The invention discloses a method for preparing high-strength slag silicate ceramsite by spraying pre-hydration cement slurry into balls. The ceramsite includes a core and a shell, wherein the material is composed as follows in terms of mass percentage, the core: cement 15-25wt%, slag powder 40-65wt%, water 15-25wt%, diatomaceous earth 5-10wt% , retarder; shell: 15wt% cement, 85wt% fly ash, the shell is 4~6% of the core mass; it is formed into balls by spraying cement slurry, and the pottery is made after natural curing and autoclaving The compressive strength of the particle cylinder can reach 16~22MPa. The present invention uses slag as raw material, which provides a way for resource utilization of slag; the use of pre-hydrated cement slurry to form balls can solve the problem of difficulty in forming barren material slag into balls; the use of cement slurry atomization technology is beneficial to cement slurry Evenly dispersed inside the ceramsite, the silicate ceramsite solves the problem that the strength of artificial light aggregates is generally low and it is difficult to configure high-strength lightweight aggregate concrete.

Description

technical field [0001] The invention relates to a silicate ceramsite and a preparation method thereof, belonging to the field of artificial light coarse aggregate production for structural light concrete. Background technique [0002] Slag is a kind of industrial solid waste, which is the waste residue discharged from coal-burning in thermal power plants, industrial boilers and civil equipment. The output of slag is huge, and the utilization amount is much lower than the output amount. Many power plants adopt the natural accumulation method, which not only causes dust, releases sulfur-containing gas, and even causes fire due to spontaneous combustion. Slag occupation of cultivated land, environmental pollution, and outlet problems have become environmental and socio-economic issues that have attracted much attention. At present, there are not many channels for utilization of slag in our country, mainly for brick making and road paving. The former utilizes the unburned coal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B38/00C04B38/08B28B1/00C04B111/40
CPCB28B1/004C04B28/04C04B38/009C04B38/08C04B2111/00017C04B2111/40C04B18/141C04B14/08C04B2103/22C04B18/08
Inventor 崔崇孙亮崔晓昱丁锡峰张士华李天君
Owner NANJING UNIV OF SCI & TECH
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