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Method for cleaning and descaling phosphoric acid storage tank

A storage tank and phosphoric acid technology, which is applied to cleaning methods and appliances, chemical instruments and methods, and cleaning hollow objects, etc., can solve the problems of time-consuming and labor-intensive manual cleaning and descaling, and achieve shortened cleaning time, convenient use, and simple preparation Effect

Inactive Publication Date: 2010-06-30
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for cleaning and descaling phosphoric acid storage tanks, which can clean and descale phosphoric acid storage tanks and overcome the time-consuming and labor-intensive defects of manual cleaning and descaling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: First, 12t of nitric acid with a mass fraction of 98%, 12t of sulfuric acid with a mass fraction of 98%, 130t of fluosilicic acid with a mass concentration of 18%, and 60kg of slow-release agent with a mass concentration of 100%, were mixed with water and stirred evenly , is mixed with 600t of cleaning solution; the mass fraction of nitric acid in the prepared cleaning solution is 2%, the mass fraction of sulfuric acid is 2%, the mass fraction of fluosilicic acid is 4%, and the mass fraction of slow-release agent is 0.01%; the cleaning solution is heated to Put it into the phosphoric acid storage tank after 50℃ and soak the scale in the tank for 24 hours, then the scale can be cleaned and removed.

Embodiment 2

[0013] Example 2: First, 36t of nitric acid with a mass fraction of 98%, 36t of sulfuric acid with a mass fraction of 98%, 260t of fluosilicic acid with a mass fraction of 18%, and 120kg of slow-release agent with a mass fraction of 100%, were mixed with water and stirred evenly , be mixed with 600t of cleaning solution; the mass fraction of nitric acid in the prepared cleaning solution is 6%, the mass fraction of sulfuric acid is 6%, the mass fraction of fluosilicic acid is 8%, and the mass fraction of sustained release agent is 0.02%; the cleaning solution is heated to Put it into the phosphoric acid storage tank after 80℃ and soak the scale in the tank for 24 hours, then the scale can be cleaned and removed.

Embodiment 3

[0014] Example 3: First, 24t of nitric acid with a mass fraction of 98%, 24t of sulfuric acid with a mass fraction of 98%, 200t of fluosilicic acid with a mass fraction of 18%, and 90kg of slow-release agent with a mass fraction of 100%, were mixed with water and stirred evenly , be mixed with 600t of cleaning solution; the mass fraction of nitric acid in the prepared cleaning solution is 4%, the mass fraction of sulfuric acid is 4%, the mass fraction of fluosilicic acid is 6%, and the mass fraction of sustained release agent is 0.015%; the cleaning solution is heated to After 60°C, put it into the phosphoric acid storage tank and soak the scale in the tank for 24 hours, and then the scale can be cleaned and removed.

[0015] After adopting this method, the cleaning time of the phosphoric acid storage tank can be shortened by 80 hours, the cleaning cost has been reduced by nearly 20,000 yuan / year, and each cleaning has reduced P 2 o 5 The loss of 200 tons.

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PUM

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Abstract

The invention discloses a method for cleaning and descaling a phosphoric acid storage tank, which comprises the following steps: preparing a cleaning solution from 2 to 6 mass percent of nitric acid, 2 to 6 mass percent of sulphuric acid, 4 to 8 mass percent of hydrofluosilicic acid and 0.01 to 0.02 mass percent of sustained release agent; and heating the cleaning solution, adding the cleaning solution into the phosphoric acid storage tank, starting a stirrer to stir the mixed solution and dipping scales in the storage tank with the cleaning solution to clean and remove the scales, wherein the sustained release agent is sodium molybdate or ATMT; temperature at which the cleaning solution is heated is 50 to 80 DEG C; and the scales in the storage tank are dipped for 24 hours. By adopting the method of the invention, the cleaning time of the phosphoric acid storage tank is shortened, cleaning cost is reduced and the operating ratio of a device is increased. The cleaning solution in the method is simple to prepare, convenient to use and recyclable. The method is applied to wet-process phosphoric acid production factories.

Description

technical field [0001] The invention relates to equipment for phosphoric acid production, as well as a descaling method and a descaling agent, and more specifically, a method for descaling a phosphoric acid storage tank. Background technique [0002] As we all know, in the production process of wet-process phosphoric acid, due to the large amount of impurities contained in the raw material phosphate rock, the wet-process phosphoric acid equipment is prone to fouling. The traditional descaling method for phosphoric acid storage tanks uses manual cleaning. Practice has proved that this method not only requires a lot of time, but also requires a lot of manpower and material resources, and cleaning the phosphoric acid reaction tank and storage tank will lose a lot of P 2 o 5 . The scale in the phosphoric acid storage tank is increasing continuously, reducing the effective volume of the reaction tank and acid storage tank, and affecting the normal operation of the wet process p...

Claims

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Application Information

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IPC IPC(8): B08B9/08
Inventor 郭世伟黄进杨毅张涛刘海冯克敏杨国行文慧孟文祥姚石林吴松张天毅
Owner WENGFU (GRP) CO LTD
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