Method for taking phosphogypsum under wet-process deslagging conditions

Abstract

The invention discloses a method for taking phosphogypsum under wet-process deslagging conditions, which comprises the following steps: carrying out cyclone graded concentration on phosphogypsum slurry with a cyclone, and carrying out dehydration and dry stack on the phosphogypsum slurry with a high frequency vibrating screen. The method can effectively concentrate the thick phosphogypsum slurry to a solid content of 70%, thereby achieving the conditions for dry stack transportation. The water content of the filtered phosphogypsum is 30% or so, thereby being easy to implement dry stack and transportation. The transportation distance between the production device and the subsequent processing is short, thereby lowering the transportation cost by 3 yuan or so per ton of gypsum. The invention has wide market application prospects.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid production, and in particular relates to a method for taking phosphogypsum under wet-process slag-discharging process conditions. Background technique [0002] The by-product phosphogypsum produced by wet process phosphoric acid usually adopts two methods of dry slagging and wet slagging at the end of filtration. Dry slag discharge requires a large turnover of phosphogypsum storage yard in the factory area, and a large number of vehicles are required for transportation, which is easy to pollute the roads and surrounding environment of the factory area; while the storage yard is outside the factory area, it requires longer belt transportation equipment and equipment investment. High and difficult to maintain and manage. More importantly, when the gypsum is not used up or during the rainy season, a large amount of gypsum cannot be transported away in time, and eventually the pho...

AI Technical Summary

Problems solved by technology

If a large amount of phosphogypsum is hauled from the slag yard, there are the following problems: ①The heavy-duty vehicles that haul a large amount of phosphogypsum out of the slag yard can only choose another road, which is far away and expensive, and there are hidden dangers of safety; ②The road to the slag yard It is narrow and steep, and the road surface is slippery during the rainy season, making it impossible to transport phosphogypsum, which will affect the comprehensive utilization of phosphogypsum; When using slag storage (tailings storage) or closed storage tailings storage for mining and reuse, a qualified unit must be hired for technical demonstration, engineering design and safety evaluation

[0007] In view of the inconvenient use of phosphogypsum in the slag yard, filter equipment is added to use phosphogypsum within the scope of the wet slag discharge pipeline outside the factory area, but the new filter system needs to invest a lot of money and build a large factory building. And later maintenance costs and operating costs are higher

[0008] To sum up, there are many problems in the way of taking phosphogypsum under the conditions of the existing wet slagging process, resulting in high cost of phosphogypsum utilization, which is an urgent technical problem to be solved in the comprehensive utilization of phosphogypsum

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