Processing system of dilute phosphoric acid

Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to a processing system of dilute phosphoric acid. The processing system comprises an adding device (1), a pulp tank (2), an extraction tank (3), a digestion tank (4), a filtering device (5) and a dilute phosphoric acid tank (6). The pulp tank (2) is connected with the extraction tank (3) through a pipeline, the extraction tank (3) is connected with the digestion tank (4) through a pipeline, and the filter (5) is connected with the adding device (1), the digestion tank (4) and the dilute phosphoric acid tank (6) through pipelines. The processing system has the advantages of being stable in running and easy and convenient to operate, the yield of dilute phosphoric acid can be effectively increased, and energy saving, emission reduction and environmental protection can be achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a processing system of dilute phosphoric acid. Background technique [0002] Existing dilute phosphoric acid production and processing system for wet-process phosphoric acid: the extracted slurry after extraction reaction is pumped to a belt filter or a rotary filter for filtration and washed to obtain the required dilute phosphoric acid product, and the phosphogypsum passes through the slag discharge system Discharge to the slag yard for storage or resource recycling. The problems of this processing system are that the water-soluble phosphorus content of phosphogypsum slag is as high as 2-5%, the phosphorus recovery rate is low, the loss is large, the waste of resources is serious, there is a large hidden danger of environmental pollution, and the production cost of enterprises is high. Due to the high phosphorus content in gypsum, it is more difficult for...

AI Technical Summary

Problems solved by technology

The problem of this processing system is that the water-soluble phosphorus content of phosphogypsum slag is as high as 2-5%, the phosphorus recovery rate is low, the loss is large, the waste of resources is serious, there is a large hidden danger of environmental pollution, and the production cost of the enterprise is high.

Due to the high phosphorus content in gypsum, it is more difficult for the resource utilization of phosphogypsum, and it may also cause secondary pollution of phosphorus; the temperature of dilute phosphoric acid extraction slurry is as high as 80-85 degrees Celsius, and the pH value is as low as about 1, which belongs to high temperature Strong acid materials, it is difficult to improve filtration efficiency and improve filtration conditions

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