Technology and device for producing defluorinated phosphoric acid

A technology for defluorinated phosphoric acid and production equipment, applied in the fields of phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as the entry of fluorine resources, and achieve the effect of increasing the fluorine escape rate and increasing the surface reaction area.

Pending Publication Date: 2020-04-10
HUANGGANG NORMAL UNIV +1
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Problems solved by technology

The utilization rate of fluorine in the above-mentioned current process is only...

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  • Technology and device for producing defluorinated phosphoric acid

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] The invention includes the production process of defluorinated phosphoric acid, and its technical feature is that the fluorine-containing phosphoric acid produced by wet-process phosphoric acid is divided into two parts, one part is returned to the phosphoric acid production reaction kettle to react with phosphate rock slurry, which is called back acid, and the other part is used as a crude product , which is called crude phosphoric acid; the jet pump A, reactor, jet pump B, gas-liquid separator, and absorption tower are connected in turn by pipelines to form a loop closed pipeline system, and the system is controlled to be in a micro-negative pressure state; the jet pump A , B Let the gas in the system circulate at high speed, the vacuum generated by the jet pump first sucks the back acid and sulfuric acid into the vacuum chamber and mix...

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Abstract

A technology for producing defluorinated phosphoric acid is characterized in that fluorine-containing phosphoric acid produced from wet-process phosphoric acid is divided into two parts, one part is used as a returned acid, and the other part is used as crude phosphoric acid; an injection pump A, a reaction kettle, an injection pump B, a gas-liquid separator and an absorption tower are sequentially connected through pipelines to form a circulating closed pipeline system which is in a micro-negative pressure state; the injection pump A and the injection pump B enable a gas in the system to circularly flow at a high speed, and the injection pump A sucks and mixes the returned acid and sulfuric acid, then sucks a reaction liquid and sulfuric acid in the reaction kettle, mixes the reaction liquid and sulfuric acid with gas flow and sprays the obtained mixture onto the liquid level of the reaction kettle; vacuum generated by the injection pump B makes the crude phosphoric acid and low-fluorine hot steam emitted from the reaction kettle be sucked and mixed and then enter the gas-liquid separator, a liquid led out from the gas-liquid separator is refined product defluorinated phosphoric acid, the gas is sent to the bottom of the absorption tower, and a defluorination tail gas led out from the top of the absorption tower enters the injection pump A and circularly flows; and a washing liquid is sprayed from the top of the absorption tower, and fluosilicic acid liquid is led out from the bottom of the absorption tower. The invention further discloses a device for producing defluorinated phosphoric acid.

Description

technical field [0001] The invention belongs to the field of fluorine resource utilization, and in particular relates to a defluorinated phosphoric acid production process and device. Background technique [0002] Fluorine is an element with extremely high reactivity, known as the "urchin in chemistry". However, once fluorine is combined with other elements, it will become a compound with "high safety performance" that is heat-resistant and difficult to be eroded by drugs and solvents. The chemical properties of the compound are stable, and fluorine has strong non-metallic properties. Fluorine only appears in the form of minerals, and the main fluorine-containing minerals in industry are fluorite and fluoroapatite. The chemical formula of fluorite is (CaF2), which has various colors and is widely distributed all over the world. It is the main source of fluorine; the mining of fluorite ore is the largest source of fluorine in the world. Due to long-term mining, the reserves ...

Claims

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Application Information

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IPC IPC(8): C01B25/237
CPCC01B25/2372
Inventor 曾舟华黄忠查炎华余双强易忠敏蒋小春
Owner HUANGGANG NORMAL UNIV
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