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
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[0012] Example 1: First add 12t of nitric acid with a mass fraction of 98%, 12t of sulfuric acid with a mass fraction of 98%, 130t of fluorosilicic acid with a mass concentration of 18%, and 60kg of a slow-release agent with a mass concentration of 100%. Add water and mix well. , Formulated into a cleaning solution of 600t; in the prepared cleaning solution, the mass fraction of nitric acid is 2%, the mass fraction of sulfuric acid is 2%, the mass fraction of fluorosilicic acid is 4%, and the mass fraction of sustained-release agent is 0.01%; the cleaning solution is heated to After 50℃, put it into the phosphoric acid storage tank to soak the scales in the tank for 24 hours, then the scales can be cleaned and removed.
Example Embodiment
[0013] Example 2: First add 36t of 98% nitric acid, 36t of 98% sulfuric acid, 260t of 18% fluorosilicic acid, 120kg of 100% slow release agent, add water, mix and stir evenly , Formulated into a cleaning solution of 600t; in the prepared cleaning solution, the mass fraction of nitric acid is 6%, the mass fraction of sulfuric acid is 6%, the mass fraction of fluorosilicic acid is 8%, and the mass fraction of sustained-release agent is 0.02%; the cleaning solution is heated to After 80℃, drive into the phosphoric acid storage tank to soak the scales in the tank for 24 hours, then the scales can be cleaned and removed.
Example Embodiment
[0014] Example 3: First add 24t nitric acid with a mass fraction of 98%, 24t sulfuric acid with a mass fraction of 98%, 200t fluorosilicic acid with a mass fraction of 18%, and 90kg of a sustained-release agent with a mass fraction of 100%, add water and mix well. , Formulated into a cleaning solution of 600t; in the prepared cleaning solution, the mass fraction of nitric acid is 4%, the mass fraction of sulfuric acid is 4%, the mass fraction of fluorosilicic acid is 6%, and the mass fraction of sustained-release agent is 0.015%; the cleaning solution is heated to After 60℃, put it into the phosphoric acid storage tank to soak the scale in the tank for 24 hours, 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 is reduced by nearly 20,000 yuan / year, and the cleaning time is reduced by P 2 O 5 The loss of 200 tons.
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