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Phosphogypsum decomposition process

A phosphogypsum, calcium sulfate technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium oxide/hydroxide, etc., can solve problems such as economic infeasibility

Active Publication Date: 2020-08-21
OCP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The large amount of energy required remains an obstacle making the method economically unfeasible

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0071] Example 1 - Decomposition of PG into SO 2 and CaO for optimal carbon and O 2

[0072] Carbon oxidation provides the CO required to react with PG at 1100 °C according to the following reaction:

[0073] CaSO 4 +CO→CaO+SO 2 +CO 2 T=1100°C (3)

[0074] However, the following undesired reactions also occur at 1100 °C, which indicates an optimal demand for CO concentration:

[0075] CaSO 4 +4CO→CaS+CO 2 T=1100°C (4)

[0076] Decomposing phosphogypsum under CO has the significant benefit of reducing the operating temperature from 1560°C to 1100°C, thereby reducing the energy expended to maintain the reactor at this temperature.

[0077] However, maintaining the reactor at 1100°C also requires a large amount of energy, making the method economically impractical.

[0078] Typically, CO can be produced from different sources such as steam reforming (natural gas) or coal / biomass oxidation. In the case of coal / biomass oxidation, by adding O 2 CO, CO 2 and H 2 O,...

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Abstract

The present invention relates to a process for decomposing calcium sulfate (CaSO4) present in phosphogypsum (PG), comprising the following steps : a) providing a reactor containing phosphogypsum (PG)and a solid source of carbon (C), b) reacting a flow of dioxygen (Oz) with the source of carbon (C) so as to generate carbon oxide (CO), c) reacting carbon oxide (CO) obtained in step a) with calciumsulfate (CaSO4) of the phosphoqypsurn to produce calcium oxide (CaO) and sulfoxide (SO2) according to the following reaction: CaSO4 and CO react to generate CaO, SO2 and CO2, wherein the mass ratio C / PG is between 0.2 and DA, and the mass ratio 15 O2 / PG is between 0.5 and 1.5.

Description

technical field [0001] The present invention relates to a method for decomposing phosphogypsum (PG), a by-product of phosphoric acid production, into calcium oxide and sulfur dioxide. Background technique [0002] Phosphogypsum CaSO 4 2(H 2 O) is a by-product of the production of phosphoric acid using the wet method (the most common method): [0003] Ca 5 (PO 4 ) 3 F+5H 2 SO 4 +10H 2 O→3H 3 PO 4 +5CaSO 4 2(H 2 O)+HF (1) [0004] Calcium sulfate is then separated from phosphoric acid by filtration. [0005] Reaction (1) shows that when 3 moles of phosphoric acid are produced, 5 moles of by-products (PG) are produced, that is, in order to produce a large amount of phosphoric acid, a large amount of PG will be discharged into the environment. [0006] However, PG contains sulfur, which can be purchased to produce sulfur dioxide for sulfuric acid production. Note that in 2008, the price of sulfur rose from $35 / ton to $840 / ton. [0007] In addition, cement plants ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/08C01B17/50
CPCC01B17/506C01F11/08B01J8/24
Inventor D·迪巴L·奥马里J·沙乌基A·穆哈德斯普尔
Owner OCP
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