Method for removing impurity iron from hydrochloric acid raw phosphoric acid by solvent extraction process

A technology of crude phosphoric acid and hydrochloric acid method, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high impurity content, increased viscosity of phosphoric acid, high cost, etc., and achieve low operating cost, high atom utilization, and extraction powerful effect

Inactive Publication Date: 2008-01-30
XIANGTAN UNIV
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Problems solved by technology

However, the proportion of lean phosphate rock in phosphate rock resources is increasing, and the impurity content in wet-process phosphoric acid is high, especially impurities such as iron, aluminum and magnesium will lead to the formation of insoluble sludge and the increase of phosphoric acid viscosity, and the presence of iron will change. The color of the product is seriously affected, which seriously affects the quality and use of phosphoric acid
[0003] Although the

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  • Method for removing impurity iron from hydrochloric acid raw phosphoric acid by solvent extraction process

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[0014] Example 1:

[0015] 1), the density d = 1.3157, P 2 O 5 The content of 7.02% hydrochloric acid crude phosphoric acid is added to activated carbon at a mass ratio of 100:1 to adsorb and remove the organic impurities in the crude phosphoric acid; 2) In crude phosphoric acid, the volume ratio of organic phase / water phase is 1:5 Add tributyl phosphate, preheat the two-phase solution in a water bath at 30°C for 10 minutes, mix the two-phase solution, shake for 10 minutes, stand for layering, separate the iron-containing extract phase, the continuous extraction stage is 3, and remove the hydrochloric acid method crude phosphoric acid In addition to iron impurities, iron phosphoric acid can be obtained.

[0016] Treat the separated iron-containing extract phase: 1) Add 0.0001mol / L hydrochloric acid to the iron-containing extract phase at a volume ratio of organic phase / water phase of 1:1, shake at 35°C for 10 minutes, and let stand for layering , Separate the iron-containing water...

Example Embodiment

[0020] Example 2:

[0021] 1), the density d = 1.3157, P 2 O 5 The crude phosphoric acid by hydrochloric acid with a content of 7.02% is added to activated carbon at a mass ratio of 100:1 to adsorb and remove the organic impurities in the crude phosphoric acid; 2) In crude phosphoric acid, the volume ratio of organic phase / water phase is 1:6 Add tributyl phosphate, preheat in a water bath at 40°C for 10 minutes, mix the two-phase solution, shake for 10 minutes, stand for stratification, separate the iron-containing extract phase, continuous extraction stage 3, remove crude phosphoric acid by hydrochloric acid In addition to iron impurities, iron phosphoric acid can be obtained.

[0022] Treat the separated iron-containing extract phase: 1) Add 0.0001mol / L hydrochloric acid to the iron-containing extract phase at a volume ratio of organic phase / water phase of 1:1, shake at 35°C for 10 minutes, and let stand for layering , Separate the iron-containing water phase, and the number of ...

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Abstract

The invention discloses a method used for removing ferrum impurities out of hydrochloric acid and rough phosphate by using a solvent extraction method: 1). organic matters is removed: rough phosphate produced by a hydrochloric acid method is added with activated carbon at a mass ratio of 100: 0.5 to 5, so as to absorb and remove the organic impurities in the rough phosphate acid; 2). extraction of ferrum is extracted: tributyl phosphite (TBP) is added to the rough phosphate acid in an organic phase/water phase volume ratio of 1: 3 to 8, and the two phase solution is mixed after being preheated for 5 to 30 minutes in water bath measured 25 to 85 DEG C, and then the mixture is shaken for 5 to 20 minutes, then settled and stratified so as to separate the extraction phase containing ferrum with 3 consecutive extraction stages, ferrum impurities out of the rough phosphate produced by the hydrochloric acid method is removed, finally the phosphorous acid without ferrum is acquired. The invention has the advantages that: firstly, the proportion for phosphorous acid to be extracted by organic phase in 3 stages is less than 15 percent, whereas, the ferrum impurities have the high extraction rate, so that the ferrum impurities can be completely separated from the phosphorous acid, and after purification the ferrum content in the phosphorous acid reaches a first-class production quality standard for industrial phosphorous acid; secondly, the method is suitable for extraction of ferrum impurities in case of a low concentration of the rough phosphorous acid, with advantages of low operation cost and expedience for exploitation of depleted phosphorous acid resources; thirdly, the TBP extraction agent adopted has low solubility in water, and the extraction agent after being extracted can be recycled after an acid-stripping treatment.

Description

technical field [0001] The invention relates to a technology for purifying iron impurities in wet-process phosphoric acid, in particular to a method for removing impurity iron from wet-process crude phosphoric acid produced from poor phosphate rock by hydrochloric acid method. Background technique [0002] At present, the world's energy demand is becoming increasingly tense, and the price of thermal phosphoric acid continues to rise. The production of wet process phosphoric acid is likely to replace the production of thermal phosphoric acid. However, the proportion of lean phosphate rock in phosphate rock resources is increasing, and the impurity content in wet-process phosphoric acid is high, especially impurities such as iron, aluminum and magnesium will lead to the formation of insoluble sludge and the increase of phosphoric acid viscosity, and the presence of iron will change. The color of the product is seriously affected, which seriously affects the quality and use of ...

Claims

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Application Information

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IPC IPC(8): C01B25/234
Inventor 杨立新陈芳菲
Owner XIANGTAN UNIV
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