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Polyphosphoric acid production method using device for making acid from phosphorous slurry

A technology of polyphosphoric acid and mud phosphorus, applied in phosphorus oxo acid, condensed phosphoric acid and other directions, can solve the problems of weak market competitiveness, many application restrictions, low mud phosphoric acid, etc., achieves significant economic benefits, simplifies process flow, operation The effect of increasing the effect

Inactive Publication Date: 2017-06-20
YUNNAN TIANAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low concentration of mud phosphoric acid, the application is more restricted, and the market competitiveness is weak, the device has been in a state of loss and is struggling

Method used

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  • Polyphosphoric acid production method using device for making acid from phosphorous slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A new method of producing polyphosphoric acid using a mud phosphorus acid plant, sending mud phosphorus, a by-product of yellow phosphorus production, into the mud phosphorus tank, heating to 70°C to 80°C, stirring and mixing evenly, pumping into the nozzle in the combustion tower, and compressing Air atomization, oxidation reaction with excess combustion air of 2.0 times in the combustion tower and reburning tower to generate P 2 o 5 The high-temperature combustion gas of mud phosphorus and water steam, the temperature is controlled at 1100°C, enters the lower part of the hydration tower 2 through the inlet pipe 1 of the high-temperature combustion gas of mud phosphorus, and countercurrently hydrates the circulating phosphoric acid in the phosphoric acid spray pipe 3 to control the circulating spray The temperature of phosphoric acid is 80°C, the height of circulating phosphoric acid liquid level 4 and mud phosphorus high-temperature combustion gas inlet pipe 1 is cont...

Embodiment 2

[0013] A new method of producing polyphosphoric acid by using mud phosphorus acid production equipment, ..., oxidation reaction occurs in combustion tower and reburning tower with excess combustion air of 2.3 times, and generates phosphorus containing 2 o 5 The temperature of the high-temperature combustion gas and water vapor is controlled at 1150°C, ..., the temperature of the circulating acid spray is controlled at 90°C, and the height of the circulating acid liquid level 4 and the high-temperature combustion gas inlet pipe 1 of the sludge phosphorus is controlled to 500mm, ... The acid pipe 7 is directly connected to the circulating phosphoric acid pipe 6 at the outlet of the circulating pump 5, and after passing through the valve 8, phosphoric acid with a concentration of about 100% by weight is drawn out. The other content omitted is the same as that in Embodiment 1, and will not be repeated here.

Embodiment 3

[0015] A new method of producing polyphosphoric acid using a mud phosphorus acid plant, ..., and an oxidation reaction with an excess of 2.5 times the combustion air in the combustion tower and the reburning tower to generate P 2 o 5 The temperature of the high-temperature combustion gas with water vapor is controlled at 1200°C, ..., the temperature of the circulating phosphoric acid is controlled at 100°C, the height of the circulating acid liquid level 4 and the high-temperature combustion gas inlet pipe 1 of the sludge phosphorus is controlled to 400mm, ... The acid pipe 7 is directly connected to the circulating phosphoric acid pipe 6 at the outlet end of the circulating pump 5, and after passing through the valve 8, phosphoric acid with a concentration of about 105% by weight is drawn out. The other content omitted is the same as that in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides a polyphosphoric acid production method using a device for making an acid from phosphorous slurry. The polyphosphoric acid production method using the device for making an acid from phosphorous slurry includes the steps: adding a phosphorous slurry byproduct from yellow phosphorous production to a phosphorous slurry groove, heating the phosphorous slurry to 70-80 DEG C, stirring and mixing the phosphorous slurry uniformly, and pumping the uniformly stirred and mixed phosphorous slurry into a nozzle in a combustion tower; atomizing the phosphorous slurry by compressed air, oxidizing the atomized phosphorous slurry with excessive 2.0 to 2.5 times of combustion-supporting air in the combustion tower to generate phosphorous slurry high temperature combustion gas containing P2O5 and water vapor, controlling the temperature at 1100-1200 DEG C, sending the phosphorous slurry high temperature combustion gas into a lower part of a hydration tower, and conducting a hydration reaction on the phosphorous slurry high temperature combustion gas and circularly sprayed phosphoric acid in a counter-flow manner, wherein the temperature of the circularly sprayed phosphoric acid is controlled at 80-100 DEG C, and heights of a circulating phosphoric acid liquid level and a phosphorous slurry high temperature combustion gas inlet tube are controlled to 400-600 millimeters; and controlling tail gas temperature at 90 DEG C or below, and directly discharging the phosphoric acid with the concentration in percentage by weight of 95%-105% from a circulating acid tube. According to the polyphosphoric acid production method using the device for making an acid from phosphorous slurry, the existing process and equipment for making an acid from phosphorous slurry are fully used for producing polyphosphoric acid; a lot of equipment investments are saved; the technological process is simplified; the energy consumption is reduced; and the method is especially suitable for the optimization and efficient utilization of the existing device for making an acid from phosphorous slurry, so that products produced by the existing device are increased dramatically in value, the scope of market application is wide, and economic benefits are significant.

Description

technical field [0001] The invention relates to a new method for producing polyphosphoric acid using a mud phosphorus acid production device. [0002] technical background [0003] When the phosphorus chemical industry produces industrial yellow phosphorus, it will produce about 10% of mud phosphorus (main components are P4: 40-50%, H2O: 40-50%, solid impurities: 6-10%), mud phosphorus It is a kind of dangerous solid waste. The safe and environmentally friendly treatment method in the prior art is a mud phosphorus acid production device imported from Russia in Yunnan, which is specially used to consume the by-product mud phosphorus in the production of yellow phosphorus (the device It belongs to the environmental protection facility that must be operated synchronously with the main device of yellow phosphorus production), which sends the by-product mud phosphorus in the yellow phosphorus production into the mud phosphorus tank and heats it to 70-80°C, stirs and mixes evenly, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/24
CPCC01B25/24
Inventor 郝智明禹武杜建学段树平
Owner YUNNAN TIANAN CHEM CO LTD
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