Crystal film blocking method and crystal rearrangement method to change the coagulation performance of new phosphogypsum

Abstract

The title of the present invention is the process of changing the coagulation performance of new phosphogypsum by crystal film blocking method and crystal rearrangement method. It involves changing the coagulation performance of new phosphogypsum by using a crystal film blocking method and a crystal rearrangement method. It mainly solves the problem that the new phosphogypsum produced by the current wet-process phosphoric acid dihydrate process is harmful to the environment. The process flow of the present invention is: (1) crystal film blocking: add crystal film blocking agent to new phosphogypsum, then add water to new phosphogypsum, stir at high speed to realize crystal film blocking; (2) crystal heavy Row: (A) Phosphogypsum after blocking the crystal film at 170-400 0 Heating under condition C for 20-100 minutes, destroying the crystal structure of the phosphogypsum after the crystal film is blocked, and cooling to room temperature; (B) adding the phosphogypsum obtained above into the growth agent, then stirring, loading the mold, extracting the slurry, Remove the mold and maintain for 24 days; generate phosphogypsum crystals arranged in an orderly manner. Adopting the present invention does not need to be piled up in a construction slag yard, and can be processed into building materials on the spot, eliminating the harm to the environment.

Description

technical field [0001] The invention relates to a process for changing the coagulation performance of new phosphogypsum by a crystal film blocking method and a crystal rearrangement method, in particular to a process for treating new phosphogypsum by using a crystal film blocking method and a crystal rearrangement method. [0002] technical background [0003] At present, more than 80% of phosphoric acid is produced by wet process phosphoric acid dihydrate process. About 4-5t (dry basis) of phosphogypsum is emitted from 1 ton of phosphoric acid produced by wet method. Phosphogypsum is different from natural gypsum. Although its purity is as high as more than 90%, except CaSO 4 .2H 2 In addition, it also contains a small amount of undecomposed phosphate rock, unwashed acid phosphate, soluble fluoride, iron, aluminum compounds, acidic substances, organic matter and other harmful impurities that endanger human health and biological growth. Harmful to the environment. The mai...

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