Phosphogypsum purification and neutralization apparatus

Abstract

The present invention discloses a phosphogypsum purification and neutralization apparatus. The phosphogypsum purification and neutralization apparatus comprises a purification device and a neutralization device. The purification device comprises a phosphogypsum feeding pipeline (15), a turntable filter (1), a washing and cycling water tank (2), a vacuum pump (3), a wastewater conveying pump (9), a filter cloth regenerating and washing pump (4) and a material placing chute (14). The neutralization device comprises a material feeding chute (16), a drive device (17), a neutralizing and mixing stirrer (5) and a cylinder (18). The neutralizing and mixing stirrer (5) is connected with a lime bin (12) through a lime conveying belt, and is connected with the material placing chute (14) through a phosphogypsum material conveying belt (6). An outlet of the neutralizing and mixing stirrer (5) is connected with a phosphogypsum product conveying belt (11). With the present invention, the phosphogypsum produced through a wet-process phosphoric acid apparatus can be recovered and utilized so as to provide great economic benefits.

Description

technical field [0001] The invention relates to a purification and neutralization device, in particular to a phosphogypsum purification and neutralization device. Background technique [0002] Phosphogypsum is mainly produced in the solid waste discharged during the production process of wet-process phosphoric acid plant. Since the phosphogypsum produced by wet-process phosphoric acid plant contains various impurities such as unwashed phosphoric acid, fluosilicic acid and organic matter, currently phosphogypsum bricks, In addition to the use of cement retarder as a raw material, the phosphogypsum produced by the wet-process phosphoric acid plant is difficult to recycle in the plasterboard construction industry, and the recycling rate of phosphogypsum is low. The current treatment method is to use a slurry pump to beat it to the phosphogypsum slag yard for stacking, which will continuously increase the storage pressure of the slag yard and cause environmental pollution. [0...

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Problems solved by technology

[0002] Phosphogypsum is mainly produced in the solid waste discharged during the production process of wet-process phosphoric acid plant. Since the phosphogypsum produced by wet-process phosphoric acid plant contains various impurities such as unwashed phosphoric acid, fluosilicic acid and organic matter, currently phosphogypsum bricks, In addition to the use of cement retarder as a raw material, the phosphogypsum produced by the wet-process phosphoric acid plant is difficult to recycle in the plasterboard construction industry, and the recycling rate of phosphogypsum is low

The current treatment method is to use a slurry pump to pump it to the phosphogypsum slag yard for stacking, which will continuously increase the pressure of the slag yard and cause environmental pollution.

[0003] In the Chinese patent database, there is No. 200820174900.8 "A Phosphogypsum Treatment Device" for applications involving phosphogypsum purification devices, but so far there is no process and device that uses phosphogypsum produced by wet-process phosphoric acid devices as raw materials to produce plasterboard. Technical solution of purification and neutralization device

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