Method for removing fluorine and chloride ions from high-concentration industrial waste acid

An industrial waste acid and high-concentration technology, which is applied in chemical instruments and methods, nitric acid, sulfur trioxide/sulfuric acid, etc., can solve the problems of large environmental pollution, complicated and dangerous operation, and the recovery and reuse of waste acid that does not involve chloride ions at the same time. , to achieve the effect of low equipment investment, simple process flow and easy operation

Active Publication Date: 2018-10-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the method for treating fluorine and chloride ions in waste acid in the prior art has complicated operation, great environmental pollution, and simply involves the removal of fluorine ions, but does not involve the removal of chloride ions and Recovery and reuse of waste acid

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  • Method for removing fluorine and chloride ions from high-concentration industrial waste acid

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Experimental program
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Embodiment 1

[0034] A method for removing fluorine and chloride ions from high-concentration industrial waste acid,

[0035] Including: first take 500ml of high-concentration industrial waste acid, which contains 50g / L H 2 SO 4 , 200g / L HNO 3 Adding 50ml molar concentration of 4mol / L cerium hydroxide and lanthanum mixed solution (1:10 mixing) and 7ml molar concentration of 1.5mol / L oxalic acid to waste acid is used as defluorination agent to carry out deep defluorination, defluorination reaction 1h, after defluorination is completed, filter and separate to obtain liquid phase and slag phase, the slag phase is a mixture of cerium fluoride and lanthanum fluoride; the mixture of cerium fluoride and lanthanum fluoride is regenerated with 300g / L sodium hydroxide solution to obtain fluoride The mixture of sodium chloride, cerium hydroxide and lanthanum hydroxide, the mixture of cerium hydroxide and lanthanum hydroxide is mixed with 7ml of oxalic acid with a molar concentration of 2mol / L to mak...

Embodiment 2

[0037] A method for removing fluorine and chloride ions from high-concentration industrial waste acid,

[0038] Including: first take 500ml of high-concentration industrial waste acid, which contains 150g / L H 2 SO 4 , 200g / L HNO 3 ; Add 20ml molar concentration of 4mol / L cerium hydroxide, lanthanum mixed solution (1:4 mix) and 8.5ml molar concentration of 1.8mol / L oxalic acid as defluorination agent to carry out deep defluorination, defluorination React for 0.5h, after defluorination is completed, filter and separate to obtain liquid phase and slag phase, the slag phase is a mixture of cerium fluoride and lanthanum fluoride; the mixture of cerium fluoride and lanthanum fluoride is regenerated with 50g / L potassium hydroxide solution, Obtain the mixture of potassium fluoride, cerium hydroxide and lanthanum hydroxide, the mixture of cerium hydroxide and lanthanum hydroxide is mixed with 8.5ml of oxalic acid with a molar concentration of 1.8mol / L to make a defluorinating agent a...

Embodiment 3

[0040] A method for removing fluorine and chloride ions from high-concentration industrial waste acid,

[0041] Including: first take 500ml of high-concentration industrial waste acid, which contains 200g / L H 2 SO 4 , 300g / L HNO 3 Adding 40ml molar concentration of 4mol / L cerium hydroxide and lanthanum mixed solution (1:1 mixing) and 9ml molar concentration of 0.5mol / L oxalic acid to waste acid is used as defluorination agent to carry out deep defluorination, defluorination reaction 2.5h, after defluorination is completed, filter and separate to obtain liquid phase and slag phase, the slag phase is a mixture of cerium fluoride and lanthanum fluoride; the mixture of cerium fluoride and lanthanum fluoride is regenerated with 350g / L sodium hydroxide solution to obtain The mixture of sodium fluoride, cerium hydroxide and lanthanum hydroxide, the mixture of cerium hydroxide and lanthanum hydroxide is mixed with 9ml of oxalic acid with a molar concentration of 0.5mol / L to make a d...

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Abstract

The invention provides a method for removing fluorine and chloride ions from high-concentration industrial waste acid and belongs to the technical field of high-concentration industrial waste acid treatment. The method comprises the steps that a rare earth hydroxide solution and a fluorine removal agent of oxalic acid are added to the high-concentration industrial waste acid to carry out defluorination treatment to obtain a slag phase and a liquid phase; then a slag phase alkali solution obtained after the defluorination treatment is carried out is separated to obtain easily-dissolved fluorideand rare earth hydroxide precipitation, and the rare earth hydroxide precipitation and the oxalic acid serve as the fluorine removal agent to carry out new-round defluorination treatment; and meanwhile, a silver nitrate solution is added to the liquid phase obtained after the defluorination treatment to obtain silver chloride precipitation and high-concentration acid, and the high-concentration acid is used in the stainless steel acid pickling working procedure. According to the method, the fluorine and chloride ions can be removed from the high-concentration industrial waste acid, the fluorine removal agent can be recycled, resources are saved, and the requirement for environmental protection of clean production is met.

Description

technical field [0001] The invention relates to the technical field of high-concentration industrial waste acid treatment, in particular to a method for removing fluorine and chloride ions from high-concentration industrial waste acid. Background technique [0002] In industries such as metal smelting production, metal electrolysis, and flue gas acid production, smelting flue gas contains a large amount of SO 2 , A large amount of waste acid will be produced in the process of soot recovery and acid production. The generated waste acid contains fluoride ions, chloride ions, nitrate ions, and sulfate ions. The waste acid must be treated to remove fluoride and chlorine before it can be discharged. At the same time, it can also realize the recycling of sulfuric acid resources. [0003] Chinese patent CN103833101A discloses a method for removing fluoride ions in drinking water. The method uses an adsorption material for adsorption treatment, and is characterized in that Cu-Fe l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/36C01B17/90C01B21/46C01G5/02
CPCC01B17/901C01B21/46C01G5/02C23G1/36
Inventor 马保中王成彦陈永强邵爽邢鹏
Owner UNIV OF SCI & TECH BEIJING
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