A method for reducing and decomposing phosphogypsum by carbonating tail gas of phosphogypsum

A phosphogypsum and carbonation technology, which is applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve problems such as prone to reaction dead ends, difficulty in treating waste with waste, and weakened economy, so as to achieve harmless and outlet problems, alleviating the shortage of sulfur resources, and realizing the effect of comprehensive utilization

Inactive Publication Date: 2016-08-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, most of the published patents for the production of sulfuric acid from phosphogypsum use carbon as the reducing agent and use solid-solid reaction, which has problems such as uneven mixing and prone to reaction dead ends. Moreover, due to the continuous rise in coal prices in recent years, its The economy is getting weaker
It is difficult to achieve the goal of treating waste with waste and recycling comprehensive utilization of phosphogypsum
At the same time, the H in the tail gas produced in the process research of phosphogypsum decomposition to produce CaS and three-phase fluidized bed carbonation to produce calcium carbonate 2 S, due to its low concentration and corrosiveness, it is difficult to realize comprehensive utilization

Method used

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  • A method for reducing and decomposing phosphogypsum by carbonating tail gas of phosphogypsum
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  • A method for reducing and decomposing phosphogypsum by carbonating tail gas of phosphogypsum

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Effect test

Embodiment 1

[0035] The method for reducing and decomposing phosphogypsum carbonation tail gas described in this embodiment uses phosphogypsum carbonation tail gas as reducing gas, and H in the tail gas 2 The volume percentage of S is 60%, CO 2 The volume percentage content is 40%. Specifically include the following steps:

[0036] (1) Phosphogypsum is naturally air-dried, crushed, ground, and sieved to obtain phosphogypsum powder with a particle size of 120 mesh;

[0037] (2) Put the phosphogypsum powder in the reduction and decomposition furnace, pass through the carbonation tail gas of phosphogypsum, and control the CaSO in the phosphogypsum 4 H in tail gas carbonation with phosphogypsum 2 The molar ratio of S is 3:2, the furnace temperature is controlled at 700°C, the reaction is for 3 hours, and the SO in the furnace gas is continuously detected online with a flue gas analyzer 2volume percentage, SO 2 The volume percentage is 14%-16%, until the reaction is complete, stop heating ...

Embodiment 2

[0041] The method for reducing and decomposing phosphogypsum carbonation tail gas described in this embodiment uses phosphogypsum carbonation tail gas as reducing gas, and H in the tail gas 2 The volume percentage of S is 55%, CO 2 The volume percentage is 45%. Specifically include the following steps:

[0042] (1) Phosphogypsum is naturally air-dried, crushed, ground, and sieved to obtain phosphogypsum powder with a particle size of 120 mesh;

[0043] (2) Put the phosphogypsum powder in the reduction and decomposition furnace, pass through the carbonation tail gas of phosphogypsum, and control the CaSO in the phosphogypsum 4 H in tail gas carbonation with phosphogypsum 2 The S molar ratio is 3:1.8, the furnace temperature is controlled at 780°C, and the reaction is 2.5 hours, and the SO in the furnace gas is continuously detected online with a flue gas analyzer 2 volume percentage, SO 2 The volume percentage is 15%-17%, until the reaction is complete, stop heating the re...

Embodiment 3

[0047] The method for reducing and decomposing phosphogypsum carbonation tail gas described in this embodiment uses phosphogypsum carbonation tail gas as reducing gas, and H in the tail gas 2 The volume percentage of S is 5%, CO 2 The volume percentage content is 95%. Specifically include the following steps:

[0048] (1) Phosphogypsum is naturally air-dried, crushed, ground, and sieved to obtain phosphogypsum powder with a particle size of 120 mesh;

[0049] (2) Put the phosphogypsum powder in the reduction and decomposition furnace, pass through the carbonation tail gas of phosphogypsum, and control the CaSO in the phosphogypsum 4 H in tail gas carbonation with phosphogypsum 2 The S molar ratio is 3:0.8, the furnace temperature is controlled at 850°C, the reaction is 0.5 hours, and the SO in the furnace gas is continuously detected online with a flue gas analyzer 2 volume percentage, SO 2 The volume percentage is 17%-20%, until the reaction is complete, stop heating the...

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Abstract

The invention discloses a method for reducing and decomposing ardealite by using an ardealite carbonatation tail gas, belonging to the technical field of phosphorus chemical industry treatment. The ardealite is reduced and decomposed by using the ardealite carbonatation tail gas in which the H2S volume percentage content is greater than or equal to 5%, a burner gas in which SO2 volume percentage content is greater than or equal to 15% is generated, the burner gas can be directly used as a qualified raw material gas of a two-transformation two-absorption sulfuric acid process, the content of CaO in a solid product is greater than or equal to 75%, the solid product can be directly used as a qualified cement raw material higher than the standard number 425, no wastes are generated in the process, the decomposition rate of the ardealite is greater than or equal to 95%, and the desulfurization degree is greater than or equal to 90%. The ardealite carbonatation tail gas is sufficiently utilized and the potential sulfur resource is developed, at the same time, diversified comprehensive utilization of the ardealite is achieved, and a circulation industrial chain for comprehensive utilization of ardealite in a phosphoric acid company by using a wet-method is established.

Description

technical field [0001] The invention relates to a method for reducing and decomposing phosphogypsum by carbonating tail gas of phosphogypsum, and belongs to the technical field of phosphorus chemical treatment. Background technique [0002] Phosphogypsum is an industrial waste produced in the wet-process phosphoric acid production process, and its main component is CaSO 4 , with the rapid development of high-concentration phosphorus compound fertilizers, phosphoric acid and detergent industries, phosphogypsum waste residues have increased sharply, and about 5 tons of phosphogypsum are discharged for every 1 ton of phosphoric acid produced. As the world's largest producer of phosphate fertilizers, China is also the largest Phosphogypsum by-product countries. With the development of phosphorus chemical industry in China, the discharge of phosphogypsum is increasing. It is estimated that by 2010, the production of phosphogypsum in my country will reach 50 million t / a, while it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/50C04B7/24
CPCY02P40/10
Inventor 马丽萍闫贝马俊资泽成
Owner KUNMING UNIV OF SCI & TECH
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