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Technique and device for preparing phosphoric acid by fluidized bed reactor

A fluidized bed reactor, phosphoric acid technology, applied in phosphoric acid, phosphorus oxyacid and other directions, can solve the problems of redox zoning, long time required, expensive coating agent, etc., achieve uniform bed temperature, reduce heat supply, The effect of avoiding premature burnout

Inactive Publication Date: 2012-08-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The following problems exist in the production process of the rotary kiln and tunnel kiln of the existing kiln-based phosphoric acid production equipment: (1) the reduction reaction temperature of phosphate rock is high, the time required is long and the reduction rate is low; (2) the coating agent is expensive and unfavorable Heat and mass transfer and redox cannot be effectively partitioned; (3) The temperature distribution in the reactor is uneven, which makes the material easy to sinter and causes the equipment to fail to operate continuously

Method used

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  • Technique and device for preparing phosphoric acid by fluidized bed reactor
  • Technique and device for preparing phosphoric acid by fluidized bed reactor
  • Technique and device for preparing phosphoric acid by fluidized bed reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 2 As shown, the fluidized bed reactor for producing phosphoric acid includes an outer shell 2, an inner shell 3, a combustion chamber 4, a cyclone separator 7 and a hydration cycle acid absorption device 24, and the inner diameter of the outer shell 2 and the inner shell 3 The ratio is 1.5:1~3:1, the inner surface of the outer shell 2 and the outer surface of the inner shell 3 form an annular oxidation zone 8; the inner shell 3 is provided with a gas distributor 5 and a fluidized reduction reaction zone 6, The gas distributor 5 adopts a vertical porous plate distributor, wherein the top of the fluidized reduction reaction zone 6 is provided with a phosphate rock mixed particle feed port 15 and a reaction gas product outlet 16 in the reduction zone, and the bottom is near the top of the gas distributor 5. The slag discharge port 12; the bottom of the combustion chamber 4 is provided with fluid medium gas inlet 9, fuel and air inlet and control valve 10 and ...

Embodiment 2

[0040] Such as image 3 As shown, the fluidized bed reactor for producing phosphoric acid includes an outer shell 2, an inner shell 3, a combustion chamber 4, a cyclone separator 7 and a hydration cycle acid absorption device 24, and the inner diameter of the outer shell 2 and the inner shell 3 The ratio is 1.5:1~3:1, the inner surface of the outer shell 2 and the outer surface of the inner shell 3 form an annular oxidation zone 8; the inner shell 3 is provided with a gas distributor 5 and a fluidized reduction reaction zone 6, The gas distributor 5 adopts a spiral porous plate distributor, wherein the top of the fluidized reduction reaction zone 6 is provided with a phosphate rock mixed particle feed port 15 and a reaction gas product outlet 16 in the reduction zone, and the bottom is near the top of the gas distributor 5. The slag discharge port 12; the bottom of the combustion chamber 4 is provided with fluid medium gas inlet 9, fuel and air inlet and control valve 10 and b...

preparation Embodiment 1

[0042] Preparation Example 1 (using Example 1):

[0043] 1) Phosphate rock (24% P 2 o 5 ) 250 parts, 290 parts of silica and 32 parts of coke, crushed and sieved to 100~200 mesh, then added 40 parts of bentonite and mixed evenly, then added 60 parts of water and stirred again, then placed in an oven to dry and dehydrate to water The content is less than 2%, and then through secondary crushing and screening to 90%, passing through 100~150 mesh sieve into granular materials for later use;

[0044] 2) Put the above-mentioned granular material into the fluidized reduction reaction zone 6 in the fluidized bed reactor through the phosphate rock mixed granular material inlet 15 of the fluidized bed reactor cylinder 1, and exchange heat through the high temperature gas generated in the oxidation zone 8 And in the combustion chamber 4 supplementary fuel (natural gas) is burned and heated to raise the temperature, and the temperature is controlled to 1350°C through the external temper...

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Abstract

The invention discloses a technique and device for preparing phosphoric acid by a fluidized bed reactor. The technique mainly comprises the following steps: crushing phosphorite, silica and carbon reducer, screening, adding bentonite, adding water, evenly mixing, drying to solidify, recrushing, screening into a granular material, putting the granular material into a fluidized bed reactor, heating to 1100-1350 DEG C by fuel burning and high-temperature gas heat exchange in the oxidizing zone, and fluidizing and reducing under the actions of N2 and reflux technique tail gas; and after the generated P2 and CO enter the oxidizing zone together with external oxygen-enriched air and are burnt to generate P2O5 and CO2 and the P2O5 gas is purified by dust removal, absorbing with recycle acid to obtain H3PO4. The fluidized bed reactor is effectively divided into a reducing zone and an oxidizing zone through a heat conducting plate, and implements heat coupling; and the phosphorite is fluidized, reduced, and subjected to forced heating and mass transfer, thereby greatly lowering the reduction temperature, shortening the reaction time and solving the problems of plugging and ringing in the rotary kiln, and the like.

Description

technical field [0001] The invention relates to a process and a device for preparing phosphoric acid using a fluidized bed reactor, and belongs to the technical field of chemical process and equipment. Background technique [0002] Phosphoric acid plays an important role in the national economy and is an intermediate raw material for the production of phosphate fertilizer and phosphate. Phosphoric acid and its downstream products are widely used in chemical industry, agriculture, medicine, food, electronics and other industries. [0003] At present, the production methods of phosphoric acid industry at home and abroad are divided into two process routes: thermal method and wet method. Thermal phosphoric acid uses yellow phosphorus produced by electrothermal method as raw material, and produces phosphoric acid through combustion and hydration. The purity of thermal phosphoric acid is high, but the power consumption of raw material yellow phosphorus is high, and the product ...

Claims

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Application Information

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IPC IPC(8): C01B25/18
Inventor 吴元欣康明雄田昊一陈启明刘少文刘根炎池汝安
Owner WUHAN INSTITUTE OF TECHNOLOGY
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