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Production system and production method of high-purity phosphoric acid

A high-purity phosphoric acid and production system technology, applied in the field of phosphorus pentoxide, can solve problems such as difficulty in obtaining high-purity phosphorus pentoxide vapor

Active Publication Date: 2020-11-27
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first object of the present invention is to provide production equipment and application that can obtain high-purity phosphorus pentoxide vapor, so as to solve the technical problem that it is difficult to obtain high-purity phosphorus pentoxide vapor in the prior art

Method used

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  • Production system and production method of high-purity phosphoric acid
  • Production system and production method of high-purity phosphoric acid
  • Production system and production method of high-purity phosphoric acid

Examples

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Effect test

Embodiment 1

[0061] figure 1 It is a structural schematic diagram of the production equipment of phosphorus pentoxide vapor in this embodiment.

[0062] Such as figure 1 As shown, the production equipment of phosphorus pentoxide vapor includes:

[0063] Reduction and oxidation furnace 100, in which the raw material containing phosphate rock undergoes a reduction and oxidation reaction to generate a first gas with a temperature of 700-900°C containing phosphorus pentoxide vapor and dust;

[0064] The heat exchange unit 200, the heat exchange unit 200 outputs the second gas with a temperature of 365-500°C after processing the first gas, specifically, it can output the second gas with a temperature of 365°C, 380°C, 450°C or 500°C ;

[0065] A high-temperature filter unit 310, the high-temperature filter unit 310 intercepts the dust in the second gas and then outputs a dust content of ≤10mg / Nm 3 Phosphorus pentoxide vapor, specifically can output dust content ≤ 10mg / Nm 3 、≤8mg / Nm 3 、≤6mg...

Embodiment 2

[0068] figure 2 It is a structural schematic diagram of the production system of phosphorus pentoxide solid in this embodiment.

[0069] Such as figure 2 Shown, the production system of phosphorus pentoxide solid comprises:

[0070] Reduction and oxidation furnace 100, in which the raw material containing phosphate rock undergoes a reduction and oxidation reaction to generate a first gas with a temperature of 700-900°C containing phosphorus pentoxide vapor and dust;

[0071] The heat exchange unit 200, the heat exchange unit 200 outputs the second gas with a temperature of 365-500°C after processing the first gas, specifically, it can output the second gas with a temperature of 365°C, 380°C, 450°C or 500°C ;

[0072] A high-temperature filter unit 310, the high-temperature filter unit 310 intercepts the dust in the second gas and then outputs a dust content of ≤10mg / Nm 3 Phosphorus pentoxide vapor, specifically can output dust content ≤ 10mg / Nm 3 、≤8mg / Nm 3 、≤6mg / Nm 3...

Embodiment 3

[0078] image 3 It is a structural schematic diagram of the phosphoric acid production system of this embodiment.

[0079] Such as image 3 As shown, the phosphoric acid production system includes:

[0080] Reduction and oxidation furnace 100, in which the raw material containing phosphate rock undergoes a reduction and oxidation reaction to generate a first gas with a temperature of 700-900°C containing phosphorus pentoxide vapor and dust;

[0081] The heat exchange unit 200, the heat exchange unit 200 outputs the second gas with a temperature of 365-500°C after processing the first gas, specifically, it can output the second gas with a temperature of 365°C, 380°C, 450°C or 500°C ;

[0082] A high-temperature filter unit 310, the high-temperature filter unit 310 intercepts the dust in the second gas and then outputs a dust content of ≤10mg / Nm 3 Phosphorus pentoxide vapor, specifically can output dust content ≤ 10mg / Nm 3 、≤8mg / Nm 3 、≤6mg / Nm 3 、≤5mg / Nm 3 、≤4mg / Nm 3 or ...

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Abstract

The invention discloses a production system and a production method of high-purity phosphoric acid. The production system of the high-purity phosphoric acid comprises: a reduction-oxidation furnace, wherein a raw material containing phosphorite is subjected to a reduction-oxidation reaction in the reduction-oxidation furnace to generate first gas containing phosphorus pentoxide steam and dust; a heat exchange unit, which is used for treating the first gas and then outputting second gas with a temperature of 365-500 DEG C; a high-temperature filtering unit, which is used for intercepting dust in the second gas and then outputting phosphorus pentoxide steam with a dust content of less than or equal to 10 mg / Nm<3>; a condensing unit, which is used for condensing the phosphorus pentoxide steaminto third gas containing a phosphorus pentoxide solid; a low-temperature filtering unit, which is used for intercepting particles in the third gas to obtain a phosphorus pentoxide solid; and a solidabsorption unit, which is used for absorbing the phosphorus pentoxide solid by utilizing an absorbent so as to obtain the high-purity phosphoric acid. According to the invention, a process is simpleand easy to control, and the high-purity high-concentration phosphoric acid can be obtained.

Description

technical field [0001] The invention relates to the technical field of phosphorus pentoxide, in particular to a production system and a production method of high-purity phosphoric acid. Background technique [0002] In order to overcome the influence of shortage of electric energy, shortage of pyrite resources and year-by-year reduction of high-grade phosphate rock on phosphoric acid production, in the early 1980s, Occidental Research Corporation (ORC) of the United States proposed the KPA method, which is the method of producing phosphoric acid with a rotary kiln (kiln method for short). phosphoric acid process). The method is to send phosphate rock, silica and carbonaceous reducing agent (coke powder or coal powder) into the rotary kiln, and at a certain temperature, the phosphorus in the phosphate rock is first reduced and volatilized in the form of elemental phosphorus vapor, and then the elemental phosphorus is Phosphorus vapor is then oxidized into phosphorus pentoxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/12C01B25/20
CPCC01B25/12C01B25/20
Inventor 高麟吴志强
Owner CHENGDU INTERMENT TECH
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