Phosphogypsum pretreatment system

Abstract

A phosphogypsum pretreatment system belongs to the field of building materials. The system comprises a ground layer, an enclosure wall, wind inlets, a ceiling, fans, material distribution devices, a wind discharging device, automatic material fetching devices, standing columns, a wall inside hot wind channel, a separation wall and underground hot wind channels; the ground layer is arranged in an area formed by the enclosure wall; the enclosure wall is arranged in the circumference of the ceiling; the wind inlets are arranged in the enclosure wall; the ceiling is an arc-shaped structure, the fans are arranged on the material distribution walls; the automatic fetching devices are arranged between the enclosure wall and the material distributing devices; the standing columns are arranged at the middle part of the ceiling; the wall inside hot wind channel is arranged in the separation wall; and the underground hot wind channels are arranged below the ground layer. The system has the characteristics of further utilization of solar energy and preheating furnace preheating, energy saving, acceleration of the evaporation of water in phosphogypsum during material distribution, rapid reduction of the water content of the phosphogypsum, uniform conveying of the phosphogypsum having a stable water content to the preheating furnace, and keeping of the productivity stable.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a phosphogypsum pretreatment system during the process of calcining industrial by-product gypsum, especially phosphogypsum, into building gypsum. Background technique [0002] Phosphogypsum is a kind of industrial by-product gypsum. It is an industrial by-product gypsum produced after neutralization by phosphorus chemical industry enterprises in order to prevent the discharge of a large amount of sulfate ions from polluting the environment during the production process. Because it contains a large amount of phosphate ions and Water, and contains harmful substances, cannot be directly used in construction; due to the increasing production of phosphogypsum, the accumulation of phosphogypsum is difficult to deal with, forming secondary pollution, which has become a difficult problem for every phosphorus chemical enterprise; For this reason, the applicant has previously ...

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Problems solved by technology

[0002] Phosphogypsum is a kind of industrial by-product gypsum. It is an industrial by-product gypsum produced after neutralization by phosphorus chemical industry enterprises in order to prevent the discharge of a large amount of sulfate ions from polluting the environment during the production process. Because it contains a large amount of phosphate ions and Water, and contains harmful substances, cannot be directly used in construction; due to the increasing production of phosphogypsum, the accumulation of phosphogypsum is difficult to deal with, forming secondary pollution, which has become a difficult problem for every phosphorus chemical enterprise; For this reason, the applicant has previously applied for patent applications "a processing method for phosphogypsum, application number: 2015100759558" and "a pretreatment system for industrial gypsum, application number: 2016101006108"; after implementation, the following problems were found , first of all, the phosphogypsum produced on the phosphorus chemical production line contains a large amount of free water, and the reduction of water content in the technical solution of the prior application cannot meet the needs of the automatic calcination production line; After the distributors are scattered on the ground and piled up, the water on the surface evaporates a lot, the moisture content is low, and the internal moisture content is high. Using the retrieving equipment previously applied for, the moisture content of the phosphogypsum sent into the preheating furnace at different times is different, so that The output is unstable, because the output per unit time is low during calcination with high moisture content, and the output per unit time is high when the moisture content is low, which makes it difficult to adjust the parameters of the calcination equipment; The water vapor that causes phosphogypsum to evaporate cannot be dissipated in time, and the air humidity in the factory building is high, which affects the water evaporation of phosphogypsum; Fourth, the material distribution device relies on the gravity of phosphogypsum to fall freely when distributing, and its contact time with the hot air in the factory building is not enough , leading to insufficient evaporation rate of water; fifthly, the previously applied factory buildings rely solely on solar energy, although the water evaporation of phosphogypsum has been increased, but for the calcination process of phosphogypsum, a large amount of energy is required. stage can reduce the water content of phosphogypsum more, it can save a lot of energy

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