Multifunctional sinking agent used in production of phosphoric acid by wet method

A wet-process phosphoric acid, multi-functional technology, applied in the fields of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of incomplete sedimentation, serious scaling, and high bottom liquid height, and achieve improved brightness and scale inhibition rate. Improved, easy-to-use effects

Inactive Publication Date: 2011-10-19
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the above flocculant is used in the settlement of concentrated crude phosphoric acid, which shows that the settlement is not complete, the bottom liquid height is too high, and clarified phosphoric acid cannot be obtained, and the follow-up process is seriously fouled, and provides a method for the production of wet-process phosphoric acid. The multifunctional sedimentation agent, the multifunctional sedimentation agent to 18wt%-53wt%P 2 o 5 Treat crude phosphoric acid, and combine defluorination, scale inhibition and sedimentation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] It is formed by mixing methyl polycellulose ether, diatomaceous earth and sodium dodecylbenzenesulfonate in a mass ratio of 20:60:20, and the product is the multifunctional settling agent of the present invention. Taking a wet-process phosphoric acid production in Hubei as an example, after using the prepared multi-functional sedimentation agent at 0.3 kg / ton, a clarified phosphoric acid with 14% bottom liquid was obtained, the solid content of phosphoric acid clear liquid was less than 0.4wt%, and the fluorine removal rate was 88 %, the scale inhibition rate in the follow-up process is greatly improved.

Embodiment 2

[0015] It is prepared by mixing ethyl polycellulose ether, diatomaceous earth and dodecylbenzenesulfonic acid in a mass ratio of 20:70:10, and the product is the settling agent of the present invention. The product is the multifunctional sedimentation agent of the present invention. Taking a wet-process phosphoric acid production in Hubei as an example, after using 0.2 kg / ton of the prepared multifunctional sedimentation agent, a clarified phosphoric acid with 15% bottom liquid was obtained. The solid content of the phosphoric acid clear liquid was less than 0.4wt%, and the fluorine removal rate was 89%. %, the scale inhibition rate in the follow-up process is greatly improved.

Embodiment 3

[0017] It is made by mixing nonionic polyacrylamide, attapulgite and sodium dodecylsulfonate at a mass ratio of 10:80:10, and the product is the settling agent of the present invention. The product is the multifunctional sedimentation agent of the present invention. Taking a certain wet-process phosphoric acid production in Hubei as an example, after using the prepared multifunctional sedimentation agent at 0.4 kg / ton, a clarified phosphoric acid with 13% bottom liquid was obtained, and the solid content of the phosphoric acid clear liquid was less than 0.4wt%. The rate is 90%, and the scale inhibition rate in the subsequent process is greatly improved.

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PUM

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Abstract

The invention relates to a multifunctional sinking agent used in production of phosphoric acid by a wet method. The multifunctional sinking agent is characterized by being prepared by mixing a non-ionic flocculating agent, a coagulation flocculation adsorbent and an anionic surfactant according to a mass ratio of 10-20:60-80:10-20. The invention provides a multifunctional sinking agent for removing impurities in coarse phosphoric acid in the process of producing phosphoric acid by a wet method. According to the invention, the multifunctional sinking agent can be completely settled; the height of base solution is low; the preparation method for the agent is simple; the cost is low; the agent has scale inhibition efficiency to the next procedure and can improve brightness and crystallization of diammonium phosphate granules to be produced.

Description

technical field [0001] The invention relates to the technical field of phosphate fertilizer manufacture, in particular to a multifunctional settling agent used for removing impurities in phosphoric acid in wet-process phosphoric acid production. Background technique [0002] In the production of wet-process phosphoric acid, especially the wet-process phosphoric acid produced with medium and low-grade phosphate rock, after it is concentrated, a large amount of solids will be produced, and as the concentration temperature decreases, secondary precipitates will be produced. , coupled with the carbonization of organic matter during the leaching of phosphate rock and the abrasion of phosphoric acid material on the graphite evaporator during concentration, the mass concentration is 48%P 2 o 5 The solid matter content in crude phosphoric acid of wet-process phosphoric acid is more than 2.6%. These solids are collectively referred to as sludge, which is also quite unfavorable to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/235
Inventor 左大学王仁宗
Owner HUBEI FORBON TECH
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