Phosphogypsum waste residue treatment method

Abstract

The invention discloses a phosphogypsum waste residue treatment method, which comprises the following steps: washing phosphogypsum waste residues with deionized water, drying, grinding, and sieving toobtain pretreated phosphogypsum powder; uniformly mixing and stirring glycerol and absolute ethyl alcohol, then adding dodecyl trimethyl ammonium bromide, and continuously stirring until a solid is dissolved to prepare a solution A; mixing and stirring the prepared pretreated phosphogypsum powder and a nitric acid solution, then adding a sulfuric acid solution, continuously stirring to prepare asolution B, slowly dropwise adding the prepared solution A into the solution B, transferring the prepared mixture into a reaction kettle by adopting intermittent ultrasonic treatment, reacting, cooling to room temperature after the reaction is finished, and filtering the reaction solution to obtain a filtrate; and filtering to obtain a solid, and drying the solid to obtain the nano calcium sulfatecrystal. The method is simple to operate, and the prepared nano calcium sulfate crystal is good in stability, has the particle size of 30-50nm and is good in dispersion.

Description

Technical field:

[0001] The invention relates to the field of building materials, in particular to a method for treating phosphogypsum waste residue. Background technique:

[0002] Phosphogypsum is the waste residue in the phosphoric acid and ammonium phosphate chemical fertilizer industry produced by the wet method of phosphate rock powder. It is acidic and seriously pollutes the environment. It is regarded as the number one chemical waste residue by all countries in the world. Millions of tons of phosphogypsum are produced, only a small part is used as cement retarder and acid co-production cement, and most of them are not fully utilized. The storage of phosphogypsum industrial waste residue not only takes up land but also pollutes the environment. The Outline of the "Eleventh Five-Year Plan" also proposes to do a good job in the comprehensive utilization of resources and promote the utilization of industrial waste such as fly ash, coal gangue, metallurgical and chemical w...