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A method for preparing light ceramic sand particles from coal kiln dust and its application

A technology of lightweight ceramics and granules, applied in the field of light sand, can solve the problems that coal kiln dust cannot be used, and light sand particles are not mentioned, and achieve the effects of alleviating waste disposal problems, cheap raw materials, and protecting the ecological environment

Active Publication Date: 2022-06-24
阿巴斯汗
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, there is no prior art method for dealing with coal kiln dust because its properties are significantly different from dry fly ash, bottom ash, or a combination of the two
All processes with simple modifications, including those in 3099 / MUM / 2011, were found to be unsuitable for coal kiln dust
[0012] Lightweight sand particles produced from coal kiln dust are not mentioned in the above prior art, which is a key feature of the present invention

Method used

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  • A method for preparing light ceramic sand particles from coal kiln dust and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for preparing light ceramic sand particles from coal kiln dust and fly ash. The method mixes 50-95wt% coal kiln ash and 50-5wt% fly ash. Coal kiln dust and fly ash were converted into granules using a high intensity shear mixer and the granules were dried at 150-300°C. High temperature sintering of the dried particles in the temperature range of 975-1300°C. The final product complies with the uniform DIN13139 (sand for mortar) and DIN12620 (fine aggregate for concrete) particle size grading standard. At the same time, the product also meets the requirements of DIN 13055 (lightweight aggregates for concrete and mortar).

Embodiment 2

[0042] A method for preparing light-weight ceramic sand particles as described in Embodiment 1, comprising the following steps:

[0043] (a) converting coal kiln dust and fly ash mixtures into pellets;

[0044] (b) drying the particles to obtain dry particles;

[0045] (c) sintering the dried particles at a high temperature, thereby obtaining the lightweight ceramic sand particles.

Embodiment 3

[0047] The preparation method of Example 1 preferably uses 50-95wt% coal kiln ash and 50-5wt% fly ash. The difference from Embodiment 1 is that in this embodiment, before forming particles, boronite is added to fly ash or coal kiln ash, and the mass percentage of coal kiln ash can be between 50 and 95 wt %, The mass percentage of coal ash is 45-5 wt%, and the mass percentage of bentonite is 5-0 wt%.

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Abstract

The invention relates to a method for manufacturing lightweight ceramic sand particles as building materials from coal kiln dust. More specifically, the present invention relates to a new process of directly using coal kiln dust and fly ash as secondary raw materials to produce sintered composite light ceramic sand particles. The synthetic lightweight ceramic sand particles can be used as building materials. The novelty of the present invention is the low cost of production and the high yield of light sand that can compete with rapidly depleting natural sand and gravel.

Description

technical field [0001] The invention relates to the technical field of light sand, in particular to a method for directly preparing sintered synthetic light ceramic sand particles from coal kiln dust, and the light ceramic sand particles can be used as building materials. The novelty of the present invention is the production of low cost lightweight sand in high yields against rapidly depleting natural resources such as natural sand and crushed stone. Background technique [0002] Coal combustion products (fly ash and bottom ash) are waste by-products produced when coal is burned in coal-fired power plants. Currently, about 1.4 billion tons of coal combustion products (CCPs) are produced worldwide each year. The average utilization rate of CCP is around 55%, while most of the remaining 45% is dumped into ash ponds (lagoons) through wet disposal systems. [0003] In wet treatment systems, CCP is usually mixed with water at a ratio of 1:10, transported through pipes, and dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/135C04B33/13C04B33/24
CPCC04B33/1355C04B33/1352C04B33/131C04B33/1305C04B33/24C04B2235/3418C04B2235/77C04B2235/9607C04B2235/447C04B2235/95C04B18/027C04B33/135C04B33/30C04B38/009C04B2235/528C04B2235/5427C04B2235/5436C04B2235/606C04B2235/96Y02W30/91C04B14/06C04B14/106C04B18/023C04B18/06C04B18/08C04B22/16C04B24/123C04B18/0418C04B33/04C04B33/1321C04B35/10C04B35/14C04B41/0072C04B2235/327C04B2235/349
Inventor 阿巴斯汗
Owner 阿巴斯汗
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