Flue gas desulfurization byproduct-based inorganic gelled material and preparation method thereof

Abstract

The invention discloses a flue gas desulfurization byproduct-based inorganic gelled material and a preparation method thereof. In the material, desulfurization ash generated in flue gas desulfurization treatment of a coal fired power plant is used as a main material; and slag, gypsum and cement clinker are mixed and ground with the main material to form the inorganic gelled material. The inorganic gelled material comprises the following components in percentage by weight: 30 to 40 percent of desulfurization ash, 45 to 55 percent of slag, 3 to 5 percent of gypsum and 8 to 12 percent of cement clinker. Because the desulfurization ash is used as a raw material for preparing the inorganic gelled material, no or little natural resource is used, and secondary pollution of the desulfurization ash is reduced. The preparation method comprises the steps of raw material selection, pre-grinding, mixing and grinding. Because the mechanical means is adopted, the raw materials do not need high-temperature calcination treatment, the manufacturing process is very compact, the production cost is extremely low, high energy consumption and high pollution caused by calcination can be avoided, the energy can be greatly saved, and the requirements of energy conservation and emission reduction are met. By detection, various inspection indexes of the inorganic gelled material meet the requirement of 22.5 strength level in GB / T3183-2003 Masonry Cement, and the inorganic gelled material can fully replace the traditional product.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an inorganic gelling material based on flue gas desulfurization by-products and a preparation method thereof. Background technique [0002] With the rapid development of my country's national economy, the sharp increase of industrial solid waste that has not been utilized as secondary resources not only occupies a large amount of land resources and causes many secondary pollution problems, but also is a waste of resources. Increasing demands for environmental protection and economic policies to achieve sustainable development are not in harmony. The resource utilization of industrial solid waste has increasingly become a research hotspot for scientific researchers. [0003] Flue gas desulfurization (FGD) is the most widely used method in the world to control SO 2 emission technology. According to the form of desulfurization agent and desulfurization ash, it can be divided into...

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Problems solved by technology

The desulfurization ash is a waste produced from the flue gas desulfurization process of coal-fired power plants. Although a large amount of desulfurization ash can be consumed through backfilling and road construction, it is difficult to generate economic benefits; CaSO present in the desulfurization ash 3 SO may be decomposed at high temperature 2 , so desulfurization ash is difficult to burn cement

In addition, CaSO 3 The chemical stability of desulfurization ash will affect the durability of building materials products with desulfurization ash as raw material, and when used as a cement retarder, its retarding effect is worse than that of gypsum

Those skilled in the art have been trying to use desulfurization ash as raw material to prepare the test of novel inorganic cementitious materials, but the effect obtained so far is not ideal

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