Technological method adopting ardealite and desulphurization gypsum for preparing high strength building gypsum

Abstract

The invention relates to a technological method adopting ardealite and desulphurization gypsum for preparing high strength building gypsum. The method includes the following steps: (1) raw materials include the components by mass percent: 0.5 to 2 percent of composite curing agent, 1.5 to 4 parts of composite alkali-activator and ardealite or desulphurization gypsum accounting for the rest amount; (2) after being uniformly mixed, the raw materials of the step (1) are led into a calcining furnace and then are calcinated for 2 to 3 hours at a constant temperature ranging from 150 to 200 DEG C; (3) the calcinated raw materials of the step (2) are naturally cooled, and then are ground to be fine by ball milling after cooling; and (4) the raw materials of the step (3), which are ground to be fine, are aged for 3 to 4 hours, thereby obtaining the product. The invention can effectively avoid secondary environmental pollution, greatly reduces the damage of microelements contained in the ardealite on human bodies and environment, avoids the defects of normal distribution of ardealite particles, heavily high concentration of particle distribution, poor flowability of cementitious materials, high water demand, loose structure, low strength, and the like, and can prepare high strength hemihydrate ardealite powder and desulphurization gypsum powder.

Description

technical field [0001] The invention relates to a process method for preparing high-strength building gypsum from phosphogypsum and desulfurized gypsum and a use method thereof. Background technique [0002] Phosphogypsum is the industrial waste discharged from the production process of wet-process phosphoric acid in phosphorus chemical industry. One ton of wet-process phosphoric acid (in P 2 o 5 total) to produce 4.5-5 tons of phosphogypsum. The main component of phosphogypsum is calcium sulfate, the chemical formula is CaSO 4 2H 2 O, in addition to containing a variety of other impurities. Impurities such as fluoride, free phosphoric acid, organic matter, and radioactivity contained in phosphogypsum are the main factors that cause environmental pollution during the storage of phosphogypsum. The large stockpiling of phosphogypsum not only encroached on land resources, but also polluted the atmosphere, water system and soil due to wind erosion and rain. Prolonged expos...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for preparing high-strength building gypsum from phosphogypsum and desulfurized gypsum. Disadvantages of poor fluidity, high water demand, loose structure and low strength