Unlock instant, AI-driven research and patent intelligence for your innovation.

Rotary kiln process phosphoric acid production system and production method for preheating and high temperature consolidation outside kiln

A production system and rotary kiln technology, applied in phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve problems such as 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: 2021-02-05
CHANGSHA RES INST OF MINING & METALLURGY
View PDF6 Cites 2 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rotary kiln process phosphoric acid production system and production method for preheating and high temperature consolidation outside kiln
  • Rotary kiln process phosphoric acid production system and production method for preheating and high temperature consolidation outside kiln
  • Rotary kiln process phosphoric acid production system and production method for preheating and high temperature consolidation outside kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Figure 1 to Figure 4 It shows the first embodiment of the rotary kiln phosphoric acid production system of the present invention, which is preheated and consolidated at high temperature outside the kiln, including a furnace gas circulation device 1, a consolidation and screening device 2, a reduction and oxidation device 3 and a hydration acid collection device 4 , the consolidation screening device 2 comprises a vertical furnace body 21, the vertical furnace body 21 is provided with a screening assembly 22 in the inner cavity, and the screening assembly 22 divides the inner chamber of the vertical furnace body 21 into an upper consolidation chamber 23 and The lower ash discharge chamber 24, the furnace gas circulation device 1 communicates with the upper consolidation chamber 23, the upper consolidation chamber 23 receives external raw materials, and the upper consolidation chamber 23 communicates with the reduction and oxidation device 3, and the reduction and oxidati...

Embodiment 2

[0070] Such as Figure 5 As shown, the second embodiment of the rotary kiln phosphoric acid production system of the present invention is preheated and consolidated at high temperature outside the kiln. This production system is basically the same as the system embodiment 1, the only difference is that in this embodiment, the 21 is arranged 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 vertical furnace and its operating parameters are: vertical furnace specification: 3×4.2×3.6m, gas temperature at the inlet 28: 900-1000°C, gas temperature at the gas outlet 26: 200-400 ℃, the temperature of 28 pellets at the air inlet: 200℃, the temperature of 26 pellets at the gas outlet: 900-1100℃, the amount of processed pellets: 30t / h, and the superficial air velocity of 0.2-2m / s.

[0072] Method embodiment 1:

[0073] Figure 1 to Figure 6 Shown is the first embo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a rotary kiln process phosphoric acid production system and production method for preheating and high temperature consolidation outside a kiln, wherein the system comprises a furnace gas circulating device, a consolidation and screening device, a reduction and oxidation device and a hydration and acid collection device, the consolidation and screening device comprises a vertical furnace body, and a screening assembly is arranged in an inner cavity of the vertical furnace body; the screening assembly divides the inner cavity of the vertical furnace body into an upper consolidation cavity and a lower ash discharge cavity, the furnace gas circulating device is communicated with the upper consolidation cavity, the upper consolidation cavity receives external raw materials, the upper consolidation cavity is communicated with the reduction and oxidation device, and the reduction and oxidation device is communicated with the hydration acid collecting device. The methodcomprises the following steps: S1, treating raw materials; S2, consolidating and screening; S3, carrying out reduction and oxidation reaction; and S4, hydrating to recover acid. The system has the advantages of being simple and compact in structure, energy-saving, environment-friendly, capable of achieving high-temperature solidification and screening functions, capable of simplifying proceduresand capable of reducing cost.

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 production method of preheating and high-temperature consolidation outside the kiln. Background technique [0002] Kiln-process phosphoric acid is a process technology developed by Occidental Research Corporation (ORC) of the United States in the 1980s that can directly use medium and low-grade phosphate rock and use a rotary kiln as a reactor to produce high-concentration phosphoric acid (referred to as kiln-process phosphoric acid process, or KPA process). , it makes carbon pellets from phosphate rock, silica, carbonaceous reducing agent and bentonite, and the 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 ° C, phosphorus vapor escapes from the material ball and is oxidized into P ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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