Method for improving gelling activity of ardealite

Abstract

The invention discloses a method for improving the gelling activity of ardealite. The method comprises the following steps: (1) ageing phosphogypsum with water to obtain aged phosphogypsum; (2) carrying out wet grinding on the aged phosphogypsum to obtain wet-ground phosphogypsum; (3) roasting the wet-ground phosphogypsum, and cooling to obtain roasted phosphogypsum; and (4) respectively carryingout two-stage dump leaching on the roasted ardealite by using a medicament 1 and a medicament 2 to obtain the ardealite with improved gelling activity. The method has the advantages that the process is simple, the cost is low, the gelling activity of the phosphogypsum can be greatly improved, a building material prepared from the treated phosphogypsum is high in strength and strong in water leaching resistance, the doping amount can be larger than 70%, and a way is provided for large-scale use and comprehensive utilization of the phosphogypsum.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for improving the gelling activity of phosphogypsum. Background technique [0002] my country is the most populous country in the world, and it is also a large agricultural production country. The phenomenon of "poor potassium and phosphorus deficiency" is common in agricultural cultivated land. Agricultural production requires a large amount of phosphorus chemical fertilizers. With the rapid development of my country's agricultural production, the demand for phosphorus fertilizers is in the It is increasing year by year, and the production of phosphate fertilizer requires a large amount of phosphoric acid. At present, the main production method of phosphoric acid is the wet-process phosphoric acid production technology, which will produce a large amount of phosphogypsum in the production process. Obviously, with the rapid development of the phosphorus chemical industry, ...

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Problems solved by technology

There are mainly the following aspects: 1. Phosphogypsum is used in the preparation of building materials such as various bricks and blocks, but its mixing amount is not large, generally less than 30%; 2. Phosphogypsum is used in the transportation field, but its mixing amount Only 2.8%; 3. Phosphogypsum production of sulfuric acid co-production of cement technology, but the process is long, many equipment, high energy consumption, large investment, technical difficulty; 3. Phosphogypsum production of plasterboard, this technology requires Gypsum is calcined. At present, the consumption of phosphogypsum for the industrialization of this technology is estimated to be no more than 10 million tons, which is a big gap compared with the annual increment of 70 million tons in my country.

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