Settling agent and method for rapidly settling solid substances in wet-process phosphoric acid

A wet-process phosphoric acid and sedimentation agent technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of inability to obtain phosphoric acid, high bottom liquid height, incomplete sedimentation, etc., and achieve the reduction of scaling phenomenon and the effect of Good, the effect of shortening the settling time

Inactive Publication Date: 2017-05-31
湖北大峪口化工有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the sedimentation of the above-mentioned sedimentation agent in the concentrated crude phosphoric acid sedimentation is incomplete, the sludge is very loose, the height of the bottom liquid is too high, clarified phosphoric acid cannot be obtained, and the scale is serious when the equipment is running for a long time. A settling agent for rapidly settling solids in wet-process phosphoric acid

Method used

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  • Settling agent and method for rapidly settling solid substances in wet-process phosphoric acid

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: The sedimentation agent is by the synthetic fatty acid of 33 carbon chain lengths and α - Composition of sulfonated fatty acids. fatty acids and alpha - COO of sulfonated fatty acids - / SO 3 2- The ratio is 100:1, and the alkaline aqueous solution with a mass concentration of 10% is used as a sedimentation agent.

[0022] To 5000Kg / t (P 2 o 5 Add 1‰ of the specified sedimentation agent of the present invention to 24% industrial dilute phosphoric acid liquid, stir at 50°C for 60 minutes, and let it stand for 40 minutes after the stirring is completed. After testing, the removal rate of organic carbon particles reaches 95%, F - The removal rate reached 87%, Fe 3+ The removal rate reached 37%, Mg 2+ The removal rate reached 24%, Al 3+ The removal rate reaches 25%, Ca 2+ The removal rate reaches 70%, Si 4+ The removal rate reaches 13%, and the obtained wet-process phosphoric acid is clear and bright.

Embodiment 2

[0023] Embodiment 2: The sedimentation agent is by the synthetic fatty acid of 9 carbon chain lengths and α - Composition of sulfonated fatty acids. fatty acids and alpha - COO of sulfonated fatty acids - / SO 3 2- The ratio is 10:1, and it is made into an aqueous solution with a mass concentration of 10% as a sedimentation agent.

[0024] To 10000Kg / t (P 2 o 5 10% of the sedimentation agent specified in the present invention was added to 26% of the industrial dilute phosphoric acid solution, stirred at 53°C for 55 minutes, and left to stand for 10 minutes after the stirring was completed. After testing, the removal rate of organic carbon particles reached 90%, F - The removal rate reached 92%, Fe 3+ The removal rate reached 78%, Mg 2+ The removal rate reached 34%, Al 3+The removal rate reached 26%, Ca 2+ The removal rate reached 67%, Si 4+ The removal rate reaches 46%, and the obtained wet-process phosphoric acid is clear and bright.

Embodiment 3

[0025] Embodiment 3: The sedimentation agent is by carbon chain length be the synthetic fatty acid of 33 and α - Composition of sulfonated fatty acids. fatty acids and alpha - COO of sulfonated fatty acids - / SO 3 2- The ratio is 1:100, and the alkaline aqueous solution with a mass concentration of 10% is used as a sedimentation agent.

[0026] To 5000Kg / t (P 2 o 5 Add 1% of the specified sedimentation agent of the present invention to 24% industrial dilute phosphoric acid liquid, stir at 47°C for 70 minutes, and let it stand for 40 minutes after the stirring is completed. After testing, the removal rate of organic carbon particles reaches 95%, F - The removal rate reached 90%, Fe 3+ The removal rate reached 53%, Mg 2+ The removal rate reached 66%, Al 3+ The removal rate reached 46%, Ca 2+ The removal rate reached 78%, Si 4+ The removal rate reaches 43%, and the obtained wet-process phosphoric acid is clear and bright.

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Abstract

The invention provides a settling agent and a method for rapidly settling solid substances in wet-process phosphoric acid, belongs to the technical field of purification of wet-process phosphoric acid and mainly aims to solve the problem that the conventional settling agent is unfit for settling of wet-process phosphoric acid with the concentration of 46%-48% P2O5. The settling agent is mainly characterized by comprising synthetic fatty acid with the carbon chain length being 9-33 and alpha-sulfonated fatty acid, and the COO<->/SO3<2-> ratio of the synthetic fatty acid to the alpha-sulfonated fatty acid is 100:1-1:100; the settling agent is an aqueous alkaline solution with the mass concentration of 10%. The method comprises the following steps: 1, 1 per mill-10% of the settling agent is added; 2, materials are stirred at the temperature of 47-53 DEG C for 55-70 min; 3, the materials are left to stand for 10-40 min; 4, clear and bright wet-process phosphoric acid is obtained through filtering. The organic carbon particle removal rate reaches 65%-95%, the F<-> removal rate reaches 55%-92%, the Fe<3+> removal rate reaches 16.4%-78%; the Mg<2+> removal rate reaches 14.5%-66%; the Al3<+> removal rate reaches 19%-55%; the Ca<2+> removal rate reaches 40%-78%; the Si<4+> removal rate reaches 13%-46%, and the obtained wet-process phosphoric acid is clear and bright.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid purification, and in particular relates to an excellent settling agent and a settling method for rapidly settling solids in the process of wet-process phosphoric acid purification. Background technique [0002] Wet process phosphoric acid is essentially a mixed acid containing phosphoric acid, sulfuric acid and fluosilicic acid, and contains various impurities (such as Ca 2+ , Mg 2+ , F - , Fe 3+ 、Al 3+ , SO 4 2- Plasma). For the process of producing wet-process phosphoric acid using medium and low-grade phosphate rocks, the organic matter in the phosphate rocks will be carbonized into organic carbon during leaching; after concentration, a large amount of solids will be produced, and with the increase of the temperature of concentrated phosphoric acid If it is reduced, secondary precipitation salt will be produced; in addition, the phosphoric acid material will wear th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/235
CPCC01B25/235
Inventor 姚光前姜振胜徐保明陈坤原航辉牛桂荣周晶晶李玲王百顺张小元陈梦毛仁群华云涛
Owner 湖北大峪口化工有限责任公司
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