A phosphogypsum curing agent

Abstract

The invention discloses a phosphorus gypsum curing agent. The phosphorus gypsum curing agent is prepared from the following components in parts by weight: 4 to 5 parts of Ca(OH)2, 0.4 to 0.5 part of K2CO3, 0.08 to 0.11 part of resin, 0.25 to 0.3 parts of diester, 0.1 to 0.2 part of an antacid and 1 to 2 parts of alum powder. The curing agent is prepared by adopting a mode of a reducing agent plusa gelling agent, wherein the ratio of the weight of the gelling agent to the sum of the weight of the rest components in the curing agent is (50 to 60):1; the reducing agent in the curing agent stabilizes soluble P2O5 and Fe<2+> in phosphorus gypsum by displacement and reduction actions and restores harmful components in the phosphorus gypsum into crystals to obtain a harmless and stable materialwhich is coated by the gelling agent. The improved phosphorus gypsum produced by the curing agent has certain unconfined compressive strength and water stability and can be used for roadbed filler andmaterials with other purposes; the phosphorus gypsum can be used on a large scale, so that the problem of pollution to the environment caused by stacking of the phosphorus gypsum is solved; meanwhile, the demand of a project on sand and pebbles is greatly reduced; the phosphorus gypsum curing agent has important environmental significance and social and economic benefits.

Description

technical field

[0001] The invention relates to a curing agent formula, in particular to a phosphogypsum curing agent. Background technique

[0002] Phosphogypsum is a kind of waste produced in the process of producing ammonium phosphate, which contains certain organic phosphorus and inorganic phosphorus residues, making phosphogypsum acidic. According to the current production process, about 4 tons of phosphogypsum are discharged for every 1 ton of ammonium phosphate produced. Today, phosphogypsum can only be treated as waste residue, and they are all stacked in the open air, year after year, occupying a large amount of land, and soluble P 2 o 5 and Fe 2+ Leach out with rainwater to produce acidic waste water, which will seep into the ground for a long time, affecting ground water and polluting the environment. my country is the world's largest phosphogypsum discharge country, and the national annual discharge of phosphogypsum reaches 8-12 million tons. Therefore, if p...

Images