A method for preparing high-strength anhydrite from sulfur-calcium slag

Abstract

This patent discloses a method for preparing high-strength anhydrous gypsum from sulfur-calcium slag. Add sulfur-calcium slag, calcium source, activator, and silicon-aluminum source to a drying and dispersing machine to obtain dry material, and then add the dry material to a countercurrent dryer for dehydration. Enter the fluidized bed to cool to obtain anhydrous gypsum, add surfactant, organic matter, reinforcing agent, and micropowder to the anhydrite and mix evenly to obtain high-strength anhydrous gypsum. The method has low production cost and high efficiency, and realizes high-quality recycling of resources.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste slag, in particular to the application of sulfur-calcium slag. The high-strength anhydrous gypsum can be used in the field of building materials. Background technique [0002] Sulfur-calcium slag is mainly one of industrial by-product gypsum and desulfurization ash, and the gypsum in high-strength anhydrous gypsum products is type II anhydrous gypsum. [0003] Gypsum is a sulfate mineral with the chemical formula CaSO 4 ·xH 2 O. Gypsum is divided into natural gypsum and industrial by-product gypsum. At present, the raw materials of industrial by-product gypsum are mainly phosphogypsum, desulfurization gypsum, titanium gypsum, and a small amount of fluorine gypsum, citrate gypsum, salt gypsum, etc. [0004] Desulfurization ash, mainly containing calcium sulfite, the ash residue obtained by desulfurization of slaked lime and sulfur dioxide in flue gas in a high-humidity ab...

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Problems solved by technology

The discharge of titanium gypsum not only occupies a large amount of land, but also pollutes the environment

Due to the washing of rainwater, the titanium gypsum on the stacking yard will be lost. At the same time, after the titanium gypsum is washed and soaked by rainwater, soluble harmful substances will dissolve in water, and the flow and circulation of water in the environment will seriously pollute surface water and Groundwater; on the other hand, after the accumulation of titanium gypsum is exposed to the sun and blown by the wind, a small part will be scattered in the atmosphere in powder form and settle on the surface of foreign objects that may come into contact, polluting the environment and threatening health [Li Guozhong, Zhao Shuai, Yu Yang. Application research of titanium gypsum in the field of building materials [J]. Brick and tile, 2008, (3): 58-60]

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