A scale inhibiting method of extraction apparatus in the wet phosphoric acid purifying process

A technology of extraction equipment and wet-process phosphoric acid, which is applied to chemical instruments and methods, cleaning methods using liquids, phosphorus compounds, etc., can solve the problems of scale inhibition of phosphoric acid extraction equipment, achieve the effect of improving production efficiency and prolonging cleaning time

Inactive Publication Date: 2009-10-07
WENGFU (GRP) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a scale inhibition method for extraction equipment in the process of wet phosphoric acid purification, so as to solve the problem of scale inhibition of phosphoric acid extraction equipment in the purification process

Method used

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  • A scale inhibiting method of extraction apparatus in the wet phosphoric acid purifying process
  • A scale inhibiting method of extraction apparatus in the wet phosphoric acid purifying process
  • A scale inhibiting method of extraction apparatus in the wet phosphoric acid purifying process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: use tower dirt powder as additive

[0017] Take the tower scale, soak it in water, wash until the pH of the effluent is around 6; during this time, the scale collapses into a powder, dry, grind and sieve, and take the 60-120 mesh powder for later use.

[0018] Take 100mL of feed acid, add 2g of tower scale powder at room temperature (24°C), stir evenly, and let it stand for 20 hours; after testing, the removal results of calcium ions and other impurities are shown in the table below:

[0019]

Embodiment 2

[0020] Embodiment 2: use calcium sulfate powder as additive

[0021] Using calcium sulfate powder (CaSO 4 2H 2 O) When removing the calcium sulfate impurity in the feed material acid, there are many factors that affect the operation, and the experiment is arranged by the multi-factor orthogonal test design, and the removal rate reaches 96.4% and 82.1% at a temperature of 40°C to 80°C. process result.

[0022] At the above temperature, add 1% calcium sulfate powder into the phosphoric acid feed material, stir slowly after stirring evenly, let it settle, and take the clear liquid.

[0023] At 40°C, the relationship between the removal rate of calcium ions in the feed phosphoric acid and the amount of calcium sulfate added is shown in the table below:

[0024]

Embodiment 3

[0025] Embodiment 3: use the concentrated sulfuric acid at 93% as additive with mass fraction

[0026] The moment the concentrated sulfuric acid is added to the feed phosphoric acid, it destroys the "inter-safety state" of the system, causing the calcium sulfate in the phosphoric acid to crystallize and precipitate, effectively blocking the induction period of calcium sulfate in the phosphoric acid.

[0027] Add concentrated sulfuric acid with a mass fraction of 93% to the acid at room temperature, and the dosage is twice the content of calcium ions, which is far lower than the required amount for generating sulfate with cations in the feed phosphoric acid. See the table below for the XPS analysis results of the natural precipitation of feed material phosphoric acid and the sample of concentrated sulfuric acid acid precipitation precipitation:

[0028]

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Abstract

A scale inhibiting method of extraction apparatus in the wet phosphoric acid purifying process includes: adding additive agent extraction apparatus scale formation powder or calcium sulphate powder or 93% of concentrated sulfuric acid in the feed acidity of the wet phosphoric acid purify process extraction process, breaking the 'medium safe state' of the feed phosphoric acid, shorting its induction phase, speeding up calcium sulphate deposition, thereby stoping the scale formation on the extraction apparatus; the extraction apparatus scale formation powders are taken dorm form the extraction apparatus, soaking with water, washing, wherein, the scale block is collapsed into powder, drying, flour milling, sifting to obtain the power. The scale formation powder grain fineness number is 60-100 mesh, the added amount is 1-3g feed acidity per 100mL; and the added amount of the calcium sulphate is 0.2%-5.0% of the feed phosphoric acid; and the sulfuric acid dosage is 1-5 times of calcium ion content. After the feed phosphoric acid of the practical application in the inventive method can pass through decalcification preliminary treatment, the extraction apparatus scale formation phenomenon is greatly alleviated, the apparatus scavenging period is extended, thereby the apparatus production efficiency is enhanced, which is suitable for producing enterprises for purifying wet phosphoric acid.

Description

technical field [0001] The invention relates to the production of purified wet-process phosphoric acid, and also relates to a scale-inhibiting method and a scale-inhibiting agent, and furthermore, relates to a scale-inhibiting method for extraction equipment in the wet-process phosphoric acid purification process. Background technique [0002] At present, the most widely used wet production method is to use organic solvents to extract fertilizer-grade phosphoric acid, and then purify it to obtain industrial-grade or food-grade phosphoric acid. However, in the process of preparing high-purity phosphoric acid by organic solvent extraction, while producing phosphoric acid products, impurities in the feed phosphoric acid are precipitated due to supersaturation, and a part of them is suspended solids (SS) which are discharged from the extraction equipment with the raffinate, while The other part will be fouling of the extraction equipment system. The fouling component comes from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/08C01B25/46
Inventor 曾祥钦王邵东肖仁贵李红林敖先权冉瑞泉喻仕瑞颜鹏廖霞孙应伦罗焕虎
Owner WENGFU (GRP) CO LTD
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