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Rotary kiln method phosphoric acid production system and production method with preheating and high temperature consolidation outside the kiln

A production system and rotary kiln technology, applied in phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of easy ring formation, high energy consumption and cost, difficult industrial production, and low strength of the coating layer. To achieve the effect of simple and compact overall structure, low production cost and improved economy

Active Publication Date: 2022-07-26
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] d. The wrapping layer has low strength and is easy to wear and lose, resulting in P 2 o 5 Suck back into the surface phosphate rock powder, reduce P 2 o 5 yield
[0015] If the problems of ring formation, high energy consumption and high cost in the CDK kiln phosphoric acid process mentioned above are not solved, it will be difficult to realize large-scale industrial production

Method used

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  • Rotary kiln method phosphoric acid production system and production method with preheating and high temperature consolidation outside the kiln
  • Rotary kiln method phosphoric acid production system and production method with preheating and high temperature consolidation outside the kiln
  • Rotary kiln method phosphoric acid production system and production method with preheating and high temperature consolidation outside the kiln

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Experimental program
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Embodiment 1

[0053] Figure 1 to Figure 4 Shown the first embodiment of the rotary kiln method phosphoric acid production system of the present invention, including furnace gas circulation device 1, consolidation screening device 2, reduction and oxidation device 3 and hydration acid recovery device 4 , the consolidation screening device 2 includes a shaft furnace body 21, and the shaft furnace body 21 is provided with a screening assembly 22 in the inner cavity, and the screening assembly 22 divides the inner cavity of the shaft furnace body 21 into an upper consolidation cavity 23 and a The lower ash discharge chamber 24, the furnace gas circulation device 1 is communicated with the upper consolidation chamber 23, the upper consolidation chamber 23 receives external raw materials, and the upper consolidation chamber 23 is communicated with the reduction and oxidation device 3, and the reduction and oxidation device 3 and the hydration acid recovery device 4 Connected. When in use, the r...

Embodiment 2

[0070] like Figure 5 As shown, the second embodiment of the rotary kiln method phosphoric acid production system of the present invention, which is preheated and consolidated at high temperature outside the kiln, the production system is basically the same as the system embodiment 1, and the difference is only that: in this embodiment, the shaft furnace body 21 is set as a rectangular structure, and its inner cavity is provided with a rectangular cavity. Its structure is simple and reliable.

[0071] In this embodiment, the rectangular shaft furnace and its operating parameters are: the size of the shaft furnace: 3×4.2×3.6m, the temperature of the flue gas at the air inlet 28: 900~1000°C, and the temperature of the flue gas at the air outlet 26: 200~400°C ℃, pellet temperature at inlet 28: 200℃, pellet temperature at outlet 26: 900~1100℃, processing pellet volume: 30t / h, superficial gas velocity is 0.2~2m / s.

[0072] Method Example 1:

[0073] Figure 1 to Figure 6 Shown ...

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Abstract

The invention discloses a rotary kiln phosphoric acid production system and a production method which are preheated and consolidated at a high temperature outside the kiln. The device includes a vertical furnace body, and the vertical furnace body is provided with a screening component in the inner cavity, and the screening component divides the inner cavity of the vertical furnace body into an upper consolidation cavity and a lower ash discharge cavity. The condensing cavity is communicated, the upper consolidating cavity receives external raw materials, and the upper consolidating cavity is communicated with the reduction and oxidation device, and the reduction and oxidation device is communicated with the hydration and acid recovery device. The method includes the following steps: S1: raw material treatment; S2: consolidation screening; S3: reduction and oxidation reaction; S4: hydration and acid recovery. The invention has the advantages of simple and compact structure, energy saving and environmental protection, high temperature consolidation and screening functions, simplified process and cost reduction.

Description

technical field [0001] The invention mainly relates to the technical field of phosphoric acid production, in particular to a rotary kiln method phosphoric acid production system and a production method for preheating and high temperature consolidation outside the kiln. Background technique [0002] Kiln phosphoric acid is a process technology developed by Occidental Research Corporation (ORC Company) in the United States in the 1980s that can directly use a rotary kiln for low-grade phosphate rock as a reactor to produce high-concentration phosphoric acid (referred to as kiln phosphoric acid process, or KPA method) , it will make phosphate rock, silica, carbonaceous reducing agent and bentonite into carbon pellets, pellets w (P 2 O 5 ) 10%~13, n(CaO) / n(SiO 2 ) is 0.26 to 0.55. When the high temperature gas temperature in the reduction zone of the rotary kiln is about 1350℃, the phosphorus vapor escapes from the pellet and oxidizes to P 2 O 5 , while releasing heat for t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/18B07B1/14
CPCC01B25/185B07B1/14Y02P20/10
Inventor 魏世发李肈佳
Owner CHANGSHA RES INST OF MINING & METALLURGY