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Device system for recovering nitric acid through nitrate thermal decomposition and using method thereof

A technology of thermal decomposition and nitrate, applied in the field of device systems for the thermal decomposition of nitrate to recover nitric acid, can solve the problems of uneven metal oxide particles, uneven heating of nitrate, poor operability, etc. Improve the effect of comprehensive economic indicators and device simplification

Pending Publication Date: 2020-10-30
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to: aim at technical problems such as low nitrate heated uneven utilization rate, high heating cost, complicated flow process, poor operability, and uneven metal oxide particles existing in the process of recovering nitric acid by thermal decomposition of nitrate in the prior art, Provide a device system for thermally decomposing nitrate to recover nitric acid and its application method

Method used

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  • Device system for recovering nitric acid through nitrate thermal decomposition and using method thereof

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Effect test

Embodiment 1

[0046] Such as figure 1 As shown, a device for recovering nitric acid by pyrolysis of nitrates includes a heating melting tank 1, a pyrolysis furnace 2, an atomizer 3, a dust collector 4, a blower fan 5, a tail gas heat exchanger 6, and a nitric acid absorption device 7;

[0047] The discharge port of the heating and melting tank 1 is connected to the top feed port of the pyrolysis furnace 2, and the middle discharge port of the pyrolysis furnace 2 is connected to the side feed port of the dust collector 4; the dust collector The top exhaust port of 4 is connected to the air inlet of tail gas heat exchanger 6 through fan 5, and the exhaust port of said tail gas heat exchanger 6 is connected to nitric acid absorption device 7;

[0048] The top of the pyrolysis furnace 2 is provided with an atomizer 3, and the atomizer 3 is used to spray nitrate hot fluid into the pyrolysis furnace 2; wherein, the pyrolysis furnace 2 is divided into an inner shell 8 and an outer shell 9, the in...

Embodiment 2

[0052] Using the same device system as in Example 1, the ferric nitrate hydrate is heated to 90°C in the heating melting tank 1 to cause it to melt, and then the ferric nitrate melt is added to the pyrolysis furnace 2 for heating and pyrolysis. The heating method adopted is The resistance wire is indirectly heated, and the temperature in the decomposition channel of the pyrolysis furnace 2 is controlled to be 550°C; the mixed gas entrained with the metal oxide powder in the pyrolysis furnace 2 is transported to the dust collector 4; the obtained Fe 2 o 3 The crystal form is a mixture of γ-type and α-type, with a particle size of 7.2 μm and good uniformity. The gas after dust collection is cooled by the tail gas heat exchanger 6, and then the cooled gas is sent to the nitric acid absorption device 7. After calculation, the thermal cost of decomposing one ton of ferric nitrate is 610 yuan, the concentration of nitric acid obtained is 48.7%, and the decomposition rate of ferric n...

Embodiment 3

[0054] Heat the ferric nitrate hydrate in the heating and melting tank 1 to 90°C to melt it, and then add the ferric nitrate melt to the pyrolysis furnace 2 for heating and pyrolysis. The heating method adopted is indirect heating by resistance wire, and the pyrolysis furnace is controlled 2 The temperature in the decomposition channel is 600°C; the mixed gas entrained with the metal oxide powder in the pyrolysis furnace 2 is sent to the dust collector 4; the obtained Fe 2 o 3 The crystal form is α-type, the particle size is 9.8 μm, and the particle size is uniform. The gas after dust collection is cooled by the tail gas heat exchanger 6, and then the cooled gas is sent to the nitric acid absorption device 7. After calculation, the thermal cost of decomposing ferric nitrate per ton is 680 yuan, the concentration of nitric acid obtained is 49.7%, and the decomposition rate of ferric nitrate is 99.9%.

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Abstract

The invention relates to a device system for recovering nitric acid through nitrate thermal decomposition and a using method thereof. The device system comprises a heating melting tank, a pyrolyzing furnace, an atomizer, a dust collector, a fan, a tail gas heat exchanger and a nitric acid absorption device, the heating melting tank is used for heating and melting nitrate to obtain nitrate hot fluid; the pyrolyzing furnace is used for decomposing the nitrate hot fluid from the heating melting tank; in mixed gas through decomposing, dust entrained in the mixed gas is separated, cooling and conveying into the nitric acid absorption device are carried out; wherein the pyrolyzing furnace is divided into an inner shell and an outer shell, and the inner shell is adopted to form a decomposition channel of the pyrolyzing furnace; a heating body is arranged between the inner shell and the outer shell and is a resistance wire or a microwave magnetron or a radiation heating pipe. By means of the device system, the heating cost can be effectively reduced, meanwhile, the whole process of recovering nitric acid through thermal decomposition is simplified, controllability is high, and meanwhile the prepared metal oxide is uniform in particle size.

Description

technical field [0001] The invention relates to the technical field of recovery and treatment of inorganic chemical resources, in particular to a device system for thermally decomposing nitrate to recover nitric acid and a method for using the same. Background technique [0002] Most metal nitrates can be decomposed into metal oxides, nitrogen dioxide and oxygen under heating conditions, and the released oxygen and nitrogen dioxide can be absorbed by water under certain conditions to generate nitric acid. Metal oxides can also be used in non-ferrous metal wet process Metallurgy and other chemical industries have been recycled and reused to achieve low-cost production processes. This method of thermal decomposition of metal nitrates to recover nitric acid and metal oxides has attracted more and more attention. [0003] Chinese patent CN 108862218 A discloses a method for producing nitric acid by pyrolysis of metal nitrate and its device. By pyrolyzing metal nitrate powder in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/42C01F5/06C01F7/30C01G9/03C01G49/06C01G19/02C01G21/02C01G3/02
CPCC01B21/42C01F5/06C01F7/308C01G9/03C01G49/06C01G19/02C01G21/02C01G3/02C01P2004/61
Inventor 王成彦但勇赵林马保中陈永强赵澎陈雪风高波赵顶
Owner MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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