Desulfurization gypsum status and prospects
Desulfurization gypsum history is still relatively short, comprehensive utilization has just started, its application value and market competitiveness is generally insufficient understanding of the comprehensive treatment and application of desulfurization gypsum development is slow, a considerable portion of China's desulfurization gypsum is still heap storage is the main, has become the second largest thermal power plant solid waste, not only occupies the land resources, but also unfavorable to the environment. If it cannot be well treated and comprehensively utilized, it not only takes up a large amount of landfill land, but also produces pollution to the ecological environment, which is likely to exceed the pollution level of flue gas without desulfurization.
Natural gypsum treatment process and equipment is not entirely suitable for desulfurization gypsum, increasing the difficulty of application, resulting in the country is not yet well developed application. China's current stage of desulfurization gypsum is only applied in a few fields, such as low technology content of building materials gypsum, cement auxiliary agent, land-based sky pulse material, and has not yet formed an industrial scale. If it can be fully utilized to replace part of the natural gypsum, it not only saves natural resources, but also can make the power plant solid waste resourceful. Desulfurization gypsum production and application has a great market opportunity, in the future there may be a large number of desulfurization gypsum instead of natural gypsum production of building materials products, on the scarcity of natural gypsum and desulfurization gypsum resource-rich economically developed regions, especially so.
FGD gypsum is mainly composed of calcium sulfate dihydrate, which is an industrial by-product obtained by using lime-limestone to recover sulfur dioxide from coal-fired flue gas. Desulfurization gypsum through drying, calcination, aging, modification, etc., so that the dewatering decomposition of gypsum dihydrate, shedding 1.5 crystalline water, to get to the β hemihydrate gypsum as the main component of the product, that is, construction gypsum powder. With the development and progress of gypsum industry, the demand for gypsum powder from all walks of life is getting bigger and bigger, and the quality requirement is getting higher and higher, and the manufacturing process of gypsum powder is also progressing.
With the scarcity of gypsum resources and the enhancement of people's awareness of environmental protection, FGD gypsum, which was regarded as waste in the past, is being more and more widely used as an industrial raw material.
(1) The chemical composition of FGD gypsum is very similar to that of natural gypsum, and it has high purity and low content of harmful impurities, so it is a kind of gypsum with better grade, and it can be used to replace natural gypsum in the production of construction gypsum and other gypsum products after treatment.
(2) Flue gas desulfurization gypsum has competitive advantages over natural gypsum in terms of performance and price, and can overcome the unevenness of the distribution of natural gypsum resources.
(3) Brush plaster itself has many excellent properties, using flue gas desulfurization gypsum to produce and prepare brush plaster has great advantages technically and economically, which not only reduces the production cost, but also saves environmental protection, and is a kind of building material product with good application prospect.
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