Coal gasification slag non-burned haydite and preparation method thereof

By optimizing the proportions of coal gasification slag, fly ash, river sand, cement, and alkali activator, and combining this with the use of water-reducing agents, the problems of low admixture content, high density, and high water absorption in the preparation of non-fired ceramsite from coal gasification slag were solved. High-strength, low-density non-fired ceramsite was prepared, realizing the large-scale resource utilization of coal gasification slag.

CN117417175BActive Publication Date: 2026-08-25XIAN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202311375262.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-23
Publication Date
2026-08-25
Estimated Expiration
2043-10-23

AI Technical Summary

Technical Problem

Existing technologies for preparing non-fired ceramsite from coal gasification slag suffer from problems such as low coal gasification slag content, high bulk density, high water absorption, and low strength. Furthermore, the process is complex and makes it difficult to achieve large-scale resource utilization.

Method used

By adjusting the proportions of coal gasification slag, fly ash, river sand, cement, and alkali activator, and utilizing the pozzolanic activity of the coal gasification slag, combined with the use of polycarboxylate superplasticizer and water, non-fired ceramsite with low bulk density, low water absorption, and high strength is prepared, avoiding the addition of pore-forming agents and surface treatment.

Benefits of technology

Under the conditions of coal gasification slag content ≥50% and cement content ≤20%, non-fired ceramsite with a bulk density of 760-785 kg/m3, a 1-hour water absorption rate of 8.9-9.9%, and a cylinder compressive strength of 6.1-7.2 MPa was prepared, meeting national standards, reducing raw material costs, and realizing large-scale resource utilization.

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Abstract

This invention belongs to the field of ceramsite preparation technology, and provides a non-fired ceramsite made from coal gasification slag and its preparation method. The raw materials for the non-fired ceramsite made from coal gasification slag are a matrix of non-fired ceramsite made from coal gasification slag, a binder, an alkali activator, a water-reducing agent, and water. The matrix of the non-fired ceramsite made from coal gasification slag is composed of the following components by mass percentage: 50-60% coal gasification slag, 15-30% fly ash, 5-15% river sand, and 15-20% cement; the amounts of binder and alkali activator are 7-10% and 0-3% of the mass of the matrix of non-fired ceramsite made from coal gasification slag, respectively. This invention utilizes the low apparent density and pozzolanic activity of coal gasification slag raw materials, aiming to prepare non-fired ceramsite with low bulk density, low water absorption, and high strength by adjusting the raw material ratio and the amount of alkali activator, without the need for pore-forming agents or surface treatment, while ensuring that the coal gasification slag content is ≥50% and the cement content is ≤20%.
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