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A method for desulfurizing and co-producing magnesium ammonium phosphate from phosphate rock slurry in tail gas of coal-fired circulating fluidized bed boiler

A circulating fluidized bed, magnesium ammonium phosphate technology, applied in the direction of combustion methods, fluidized bed combustion equipment, chemical instruments and methods, etc., can solve the problems that are difficult to meet the requirements of industrial production

Active Publication Date: 2019-05-14
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are difficult to meet the requirements of industrial production due to their respective defects, so the study of a new process for magnesium removal from phosphate rock slurry has become a practical problem that needs to be solved urgently

Method used

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  • A method for desulfurizing and co-producing magnesium ammonium phosphate from phosphate rock slurry in tail gas of coal-fired circulating fluidized bed boiler
  • A method for desulfurizing and co-producing magnesium ammonium phosphate from phosphate rock slurry in tail gas of coal-fired circulating fluidized bed boiler
  • A method for desulfurizing and co-producing magnesium ammonium phosphate from phosphate rock slurry in tail gas of coal-fired circulating fluidized bed boiler

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Effect test

Embodiment 1

[0079] The method for desulfurizing coal-fired circulating fluidized bed boiler tail gas phosphate rock pulp and co-producing magnesium ammonium phosphate in the present invention, the high-temperature tail gas produced by boiler combustion is pretreated through cyclone separator, high-temperature superheater, low-temperature superheater, coal saving After the first and second air air preheaters, it enters the electrostatic precipitator, and is sent to the bottom of the desulfurization tower by a fan and enters the tower in a tangential direction. Countercurrent spray washing and absorption, wherein the chemical composition of phosphate rock for producing phosphate rock slurry is shown in Table 1. The solid content of phosphate rock slurry is 40%, the pH is 5.0, the desulfurization temperature is 20-25°C, and the phosphate rock slurry reaches When the pH reaches 4.5-4.7, it is sent to the wet-process phosphoric acid extraction system, and the fresh phosphate rock slurry enters ...

Embodiment 2

[0085] The method for desulfurizing coal-fired circulating fluidized bed boiler tail gas phosphate rock pulp and co-producing magnesium ammonium phosphate in the present invention, the high-temperature tail gas produced by boiler combustion is pretreated through cyclone separator, high-temperature superheater, low-temperature superheater, coal saving After the first and second air air preheaters, it enters the electrostatic precipitator, and is sent to the bottom of the desulfurization tower by a fan and enters the tower in a tangential direction. Countercurrent spray washing and absorption, wherein the chemical composition of phosphate rock for producing phosphate rock slurry is shown in Table 1. The solid content of phosphate rock slurry is 40%, the pH is 5.5, the desulfurization temperature is 20-25°C, and the phosphate rock slurry reaches When the pH reaches 4.5-5.0, it is sent to the wet-process phosphoric acid extraction system, and the fresh phosphate rock slurry enters ...

Embodiment 3

[0091] The method for desulfurizing coal-fired circulating fluidized bed boiler tail gas phosphate rock pulp and co-producing magnesium ammonium phosphate in the present invention, the high-temperature tail gas produced by boiler combustion is pretreated through cyclone separator, high-temperature superheater, low-temperature superheater, coal saving After the first and second air air preheaters, it enters the electrostatic precipitator, and is sent to the bottom of the desulfurization tower by a fan and enters the tower in a tangential direction. Countercurrent spray washing and absorption, wherein the chemical composition of phosphate rock for producing phosphate rock slurry is shown in Table 1. The solid content of phosphate rock pulp is 40%, the pH is 6.0, the desulfurization temperature is 20-25 ° C, and the phosphate rock slurry reaches When the pH reaches 5.0-5.5, it is sent to the wet-process phosphoric acid extraction system, and the fresh phosphate rock slurry enters ...

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Abstract

The invention discloses a method for desulfurization of the exhaust gas of a coal-fired circulating fluidized bed boiler with phosphate rock slurry and co-production of magnesium ammonium phosphate. According to the method, the phosphate rock slurry is used for desulfurization of the exhaust gas of the boiler; dilute sulfuric acid is added into the phosphate rock slurry having absorbed SO2, so elemental magnesium in the phosphate rock slurry is converted into magnesium sulfate which is dissolved in a liquid phase; after enrichment of magnesium ions in the liquid phase, filtering is carried outto obtain a magnesium-removed filtrate of the phosphate ore slurry; and a nitrogen source is added to prepare the by-product ammonium magnesium phosphate. The method of the invention efficiently usesthe phosphate rock slurry as a desulfurizing agent, removes elemental magnesium in the phosphate rock slurry and prepares the by-product magnesium ammonium phosphate, so a plurality of technical problems are overcome at the same time.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment, and in particular relates to a method for desulfurizing and co-producing magnesium ammonium phosphate from phosphate rock slurry in the tail gas of a coal-fired circulating fluidized bed boiler. Background technique [0002] In recent years, my country's coal consumption accounts for about 75% of the total energy consumption. With the accelerating pace of industrialization and urbanization in my country, energy consumption will continue to rise, and the current situation that coal and other one-time energy consumption dominates will not change. The sulfur content in raw coal in my country is relatively high, and my country's emissions from coal burning to atmospheric SO 2 Approx. SO 2 90% of the total emissions are expected to be by 2020, my country's SO 2 The emission will reach 35000kt / a, ranking first in the world. SO 2 It is the main pollutant in the atmosphere and is directly rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/24C01B25/45
CPCY02P20/129
Inventor 项双龙何润林廖吉星杨昌勇张卫红张文张伟蒋学华王采艳唐丽君何花韩朝应
Owner GUIYANG KAILIN FERTILIZER CO LTD