Production method of high-temperature gypsum powder

Abstract

The invention provides a calcining method for high-temperature gypsum powder, belonging to the field of industrial waste utilization. The method comprises the following steps: 1, weighing phosphogypsum as a raw material; 2, conveying phosphogypsum produced by a production line of a phosphochemical enterprise to a phosphogypsum pretreatment device by adopting conveying equipment; 3, pre-treating the phosphogypsum in the pretreatment device; 4, feeding the pretreated phosphogypsum into a free water dehydration device through the conveying equipment; 5, removing most of free water from the phosphogypsum in the free water dehydration device; 6, feeding the phosphogypsum dehydrated by the free water dehydration device into a calcining device; 7, carrying out high-temperature calcination on thephosphogypsum in the calcination device; 8, feeding the phosphogypsum having been subjected to high-temperature calcination into a phosphogypsum phase change device for phase change; 9, sub-packagingthe phosphogypsum having been subjected to phase change or further processing. The method has the characteristics of freely controlling a phosphogypsum phase change product and saving energy.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste, and in particular relates to a production method for producing hemihydrate gypsum or anhydrous gypsum by using industrial by-product gypsum, especially phosphogypsum, to be calcined at high temperature. Background technique [0002] Gypsum is a mineral resource with a wide range of uses. It is widely used in construction, medical, chemical and other industries. The mining of natural gypsum minerals is easy to damage the natural ecology and consume energy; and the cost of gypsum products made of natural gypsum is relatively high; With the development of the industrialization process, a large amount of phosphogypsum will be produced in the phosphorus chemical industry. Phosphogypsum cannot be directly used, and a large amount of accumulation will become a pollutant harmful to the natural environment. It will cost a lot of money to deal with these pollutants. It puts great pressure on th...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned problems in the existing phosphogypsum resource utilization process, the present invention proposes a high-temperature continuous production method of phosphogypsum, which can eliminate harmful impurities inside phosphogypsum, adapt to industrial continuous production, and overcome the The defect of unstable product quality caused by inconsistent internal and external temperatures caused by gypsum agglomeration. The specific technical solution is a method for calcining high-temperature gypsum powder, which is characterized in that it includes the following steps: 1. Using phosphogypsum as a raw material; 2. Use conveying equipment to transport the phosphogypsum from the production line of the phosphorus chemical enterprise to the phosphogypsum pretreatment device; 3. Pretreat the phosphogypsum in the pretreatment device; 4. Send the pretreated phosphogypsum to the free Water dehydration device; 5. Remove most of the free water from phosphogypsum in the free water dehydration device; 6. Send the phosphogypsum dehydrated by the free water dehydration device to the calcination device; 7. Carry out high-temperature calcination in the calcination device ; 8. Send the phosphogypsum calcined at high temperature to the phosphogypsum phase change device for phase change; 9. Subpackage or further process the phosphogypsum after the phase change