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Method and apparatus for removing fluorine from wet-method phosphoric acid through air blowing method

A technology of wet-process phosphoric acid and blowing method, which is applied in the fields of chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve the problems of high required components and complex operation, etc., and achieve high yield, high yield, and economic benefits significant effect

Inactive Publication Date: 2016-01-13
SINOPEC NANJING ENG & CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the method is complicated to operate and requires higher components.

Method used

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  • Method and apparatus for removing fluorine from wet-method phosphoric acid through air blowing method

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Effect test

Embodiment 1

[0041] Fluorine-containing wet-process phosphoric acid (P 2 o 5 The mass fraction is 42.5% to 47.8%) after being treated by the screw discharge sedimentation centrifuge (1), the dense phase is collected by the filter residue collection tank (24) and then sent to the upstream filtration process by the filter residue pump (25), and the purified fluorine-containing The wet-process phosphoric acid is collected by the phosphoric acid storage tank (2) and sent to the pre-mixer (4) by the phosphoric acid feed pump (3). The diatomite with a particle size of 80 to 100 mesh is sent to the pre-mixer (4) (SiO 2 : The molar ratio of F in phosphoric acid is 1.35:1). The mixed material enters the heating tank (7) and is heated by steam and further mixed, then sent to the defluorination device (12) by the second phosphoric acid feeding pump (8), and countercurrently flows with the hot air at 205-215°C from the hot air blower (11) The contact is fully reacted, and the gas velocity of the li...

Embodiment 2

[0043] Fluorine-containing wet-process phosphoric acid (P 2 o 5 The mass fraction is 42.5% to 47.8%) after being treated by the screw discharge sedimentation centrifuge (1), the dense phase is collected by the filter residue collection tank (24) and then sent to the upstream filtration process by the filter residue pump (25), and the purified fluorine-containing The wet-process phosphoric acid is collected by the phosphoric acid storage tank (2) and sent to the pre-mixer (4) by the phosphoric acid feed pump (3). The diatomite with a particle size of 135 to 150 mesh is sent to the pre-mixer (4) (SiO 2 : The molar ratio of F in phosphoric acid is 2:1). The mixed material enters the heating tank (7) and is heated by steam and further mixed, then sent to the defluorination device (12) by the second phosphoric acid feeding pump (8), and countercurrently flows with the hot air at 305-315°C from the hot air blower (11) The contact is fully reacted, and the gas velocity of the liqu...

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Abstract

The invention discloses a method and an apparatus for removing fluorine from wet-method phosphoric acid through an air blowing method. The method includes the following steps: (1) adding the fluorine-containing phosphoric acid into a pre-mixer having a vapor coil pipe, adding diatomite into the pre-mixer to enable the phosphoric acid to be mixed with the diatomite fully in the pre-mixer, and then feeding the mixture into a defluorizing device; and (2) feeding hot air into the defluorizing device to release the fluorine from the phosphoric acid in the form of SiF4 under the effects of the hot air and the defluorizing agent, wherein fluorine-containing waste gas generated during the defluorizing process is discharged from the top of the defluorizing device and defluorized phosphoric acid is partially or totally fed back into the pre-mixer or the defluorizing device to perform the defluorizing circulation, and the other part of the defluorized phosphoric acid is fed into a MDCP workshop as a phosphoric acid finish product. By means of the method, the phosphorus-fluorine ratio (P2O5 / F) is not less than 260 in the phosphoric acid; and compared with the prior art, the fluorine content is significantly reduced in the phosphoric acid.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid defluorination, and in particular relates to a method and a device for removing fluorine from wet-process phosphoric acid by air blowing. The defluorinated phosphoric acid can be used to manufacture feed calcium phosphate MCP, MDCP and DCP. Background technique [0002] At present, there are three types of feed calcium phosphate with the largest domestic output: monocalcium phosphate (Ca(H 2 PO 4 ) 2 ·H 2 O)MCP, dicalcium phosphate (CaHPO 4 2H 2 O, Ca(H 2 PO 4 ) 2 ·H 2 O) MDCP, dicalcium phosphate (CaHPO 4 2H 2 O) DCP. They are feed additives and are added in an amount of about 2% of the feed. Taking DCP as an example, its calcium-to-phosphorus ratio is 1.3, which is equivalent to the ratio of calcium to phosphorus in animal and livestock bones, and it promotes the growth of animal bones. Wet-process phosphoric acid is the basic raw material for manufacturing MCP, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237
Inventor 孙国超李燕凤黄晶王海胡慧刘项孙菊萍祁建伟陈婕妤
Owner SINOPEC NANJING ENG & CONSTR
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