Method and device of producing phosphoric acid through reaction of SO2 and phosphoric ore pulp

A phosphate rock slurry and SO2 technology, applied in the field of phosphorus chemical industry, can solve the problems of bronchopneumonia, asthmatic bronchitis, huge consumption of manpower and material resources, and great pollution of the surrounding environment, so as to save labor and equipment costs and facilitate operation , The effect that the process conditions are easy to control

Active Publication Date: 2017-01-04
HUBEI SANNING CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vanadium catalyst in the conversion tower is a non-ferrous metal oxide, which is slightly soluble in water. After human contact, it will cause damage to the respiratory system, cardiovascular system, nervous system, gastrointestinal system, skin, etc. In severe cases, bronchial pneumonia and wheezing may occur. Bronchitis, etc., it also pollutes the surrounding environment a lot. The vanadium catalyst in the conversion tower needs to be replaced regularly. During the replacement process, not only the device needs to be stopped, but also huge manpower and material resources are consumed. The method not only has a long process flow, but also has high pollution and high cost.

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  • Method and device of producing phosphoric acid through reaction of SO2 and phosphoric ore pulp

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Experimental program
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Effect test

Embodiment 1

[0040] Implementation 1: The solid sulfur is turned into liquid sulfur through the rapid sulfur melting tank, and then pumped into the sulfur incinerator through the sulfur pump to fully react with the air blown by the main fan in the sulfur incinerator, and the reaction temperature is controlled at 1000°C to generate SO 2 The mixed gas with a mass concentration of 10% passes through the waste heat boiler and cools down to 450°C, then cools down to 100°C through the low-temperature boiler and heat exchanger, and then enters the primary reaction tower and the phosphate rock slurry in the primary circulating reaction tank from the lower part for gasification. Liquid countercurrent reaction, the reacted slurry enters the flash chamber, the vacuum degree is controlled to -0.05Mpa, the temperature is lowered to 85°C, and the gas enters from the lower part of the secondary reaction tower to perform countercurrent reaction with the slurry in the secondary circulating reaction tank. Th...

Embodiment 2

[0042] Implementation 2: The solid sulfur is turned into liquid sulfur through the rapid sulfur melting tank, and then pumped into the sulfur incinerator through the sulfur pump to fully react with the air blown by the main fan in the sulfur incinerator. The reaction temperature is controlled at 900°C to generate SO 2 The mixed gas with a concentration of 15% passes through the waste heat boiler, cools down to 400°C, then cools down to 80°C through the low-temperature boiler and heat exchanger, and then enters the primary reaction tower and the phosphate slurry in the primary circulating reaction tank from the lower part for gas-liquid Countercurrent reaction, the reacted slurry enters the flash chamber, the vacuum degree is controlled to -0.05Mpa, the temperature is lowered to 85°C, and the gas enters from the lower part of the secondary reaction tower to perform countercurrent reaction with the slurry in the secondary circulating reaction tank to control the reaction The temp...

Embodiment 3

[0044] Implementation 3: The solid sulfur is turned into liquid sulfur through the rapid sulfur melting tank, and then pumped into the sulfur incinerator through the sulfur pump to fully react with the air blown by the main fan in the sulfur incinerator, and the reaction temperature is controlled at 1000°C to generate SO 2 The mixed gas with a concentration of 15% passes through the waste heat boiler, cools down to 450°C, then cools down to 100°C through the low-temperature boiler and heat exchanger, and then enters the primary reaction tower and the phosphate rock slurry in the primary circulation reaction tank from the lower part for gas-liquid Countercurrent reaction, the reacted slurry enters the flash chamber, the vacuum degree is controlled to -0.06Mpa, the temperature is lowered to 80°C, and the gas enters from the lower part of the secondary reaction tower to perform countercurrent reaction with the slurry in the secondary circulating reaction tank to control the reactio...

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Abstract

The invention discloses a method and device of producing phosphoric acid through reaction of SO2 and phosphoric ore pulp. In the method, gas containing SO2 and phosphoric ore pulp are subjected to multilayer gas-liquid reverse contact reaction, the content of SO3 in the pulp is 0-1%, and then sulfuric acid is added for reaction, so that the content of P2O5 in the pulp is 18-25%; when the content of SO3 is 1-4%, phosphoric acid can be obtained by filtering the pulp. Compared with a conventional wet process phosphoric acid production process, the method directly uses SO2 for reacting with the ore pulp, the processes of converting absorption and extraction are avoided, and the technological process is greatly shortened. A converting tower or accelerant is avoided, it is not needed to replace accelerant at regular time, pollution to the environment by replacing the accelerant is reduced, and manpower and device cost is saved. The problems that traditional wet process phosphoric acid production is long in technological process, large in pollution, high in energy consumption and high in cost are solved effectively.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, in particular to a 2 The invention discloses a method and device for producing phosphoric acid by reacting gas and phosphate slurry. Background technique [0002] The so-called "wet process phosphoric acid" actually refers to the production of phosphoric acid by the sulfuric acid method, that is, the phosphoric acid obtained by decomposing phosphate rock with sulfuric acid. The characteristic of using the sulfuric acid method to produce phosphoric acid is: first let the sulfur react in the sulfur incinerator to generate SO 2 The gas is then converted into SO by the conversion tower under the catalytic action of vanadium pentoxide 3 After the gas is fully reacted and absorbed by the absorption tower, sulfuric acid is generated. After the sulfuric acid reacts with the pulp in the extraction tank, it enters the vacuum filter and is filtered to obtain phosphoric acid. The vana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/225
CPCC01B25/225Y02P20/129
Inventor 肖林波田承涛李攀红黄金艳徐思红
Owner HUBEI SANNING CHEM
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