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Process for recycling calcium-containing waste acid after acid leaching of fluorite

A technology of recycling and acid circulation, which is applied in the direction of calcium/strontium/barium halide, calcium/strontium/barium fluoride, crystal growth, etc., can solve the problems of high cost and limited application, and reduce the cost of acid leaching, The effect of optimizing utilization and reducing the emission of chloride ions

Pending Publication Date: 2020-11-20
LIUPANSHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is expensive and has limited application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A process for recycling calcium-containing waste acid after acid leaching fluorite, comprising the following steps:

[0027] Step 1. Add waste hydrochloric acid to 88% grade fluorite, and obtain high-quality acid-grade fluorite after fully acid leaching, and collect the first filtrate after solid-liquid separation;

[0028] Step 2, adding waste sulfuric acid to the first filtrate, stirring evenly to obtain a mixed solution;

[0029] Step 3: Evaporate and concentrate the mixed solution at 90° C. to obtain concentrated hydrochloric acid, which is condensed and reused.

[0030] Preferably, the mass ratio of waste hydrochloric acid to fluorite is 1:0.1-0.3.

[0031] Preferably, in the operation of adding waste sulfuric acid to the waste acid of pickling fluorite to obtain the treatment liquid after sufficient reaction, the reaction time is 15 minutes.

[0032] Preferably, the mass ratio of waste sulfuric acid to the first filtrate is 1:0.1-0.15, and the first filtrate is ...

Embodiment 2

[0039] A process for recycling calcium-containing waste acid after acid leaching fluorite, comprising the following steps:

[0040] Step 1. Add waste hydrochloric acid to 89% grade fluorite, and obtain high-quality acid-grade fluorite after fully acid leaching, and collect the first filtrate after solid-liquid separation;

[0041] Step 2, adding waste sulfuric acid to the first filtrate, stirring evenly to obtain a mixed solution;

[0042] Step 3: Evaporate and concentrate the mixed solution at 95° C. to obtain concentrated hydrochloric acid, which is condensed and reused.

[0043] Preferably, the mass ratio of waste hydrochloric acid to fluorite is 1:0.1-0.3.

[0044] Preferably, in the operation of adding waste sulfuric acid to the waste acid of pickling fluorite to obtain the treatment liquid after sufficient reaction, the reaction time is 20 minutes.

[0045] Preferably, the mass ratio of waste sulfuric acid to the first filtrate is 1:0.1-0.15, and the first filtrate is ...

Embodiment 3

[0052] A process for recycling calcium-containing waste acid after acid leaching fluorite, comprising the following steps:

[0053] Step 1. Add waste hydrochloric acid to 90% grade fluorite, and obtain high-quality acid-grade fluorite after fully acid leaching, and collect the first filtrate after solid-liquid separation;

[0054] Step 2, adding waste sulfuric acid to the first filtrate, stirring evenly to obtain a mixed solution;

[0055] Step 3: Evaporate and concentrate the mixed solution at 100° C. to obtain concentrated hydrochloric acid, which is condensed and reused.

[0056] Preferably, the mass ratio of waste hydrochloric acid to fluorite is 1:0.1-0.3.

[0057] Preferably, in the operation of adding waste sulfuric acid to the waste acid of pickling fluorite and fully reacting to obtain the treatment liquid, the reaction time is 23 minutes.

[0058] Preferably, the mass ratio of waste sulfuric acid to the first filtrate is 1:0.1-0.15, and the first filtrate is collec...

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Abstract

The invention discloses a process for recycling calcium-containing waste acid after acid leaching of fluorite, which comprises the following steps: 1, adding waste hydrochloric acid into 88-90% fluorite, carrying out sufficient acid leaching to obtain high-quality acid-grade fluorite, carrying out solid-liquid separation, and collecting a first filtrate, 2, adding waste sulfuric acid into the first filtrate, and uniformly stirring to obtain a mixed solution, and 3, evaporating and concentrating the mixed solution at 90-100 DEG C to obtain concentrated hydrochloric acid, and condensing and recycling the concentrated hydrochloric acid. Compared with the prior art, the method has the advantages that firstly, the maximum resource utilization of the waste hydrochloric acid is realized, and thewaste hydrochloric acid can be continuously recycled in the acid leaching post-treatment process, so that the discharge of a large amount of chloride ions in the wastewater of the acid leaching process is reduced, and after calcium sulfate in the raw acid solution is subjected to heating enrichment crystallization modification treatment, a high-quality calcium sulfate whisker product can be produced.

Description

technical field [0001] The invention relates to the technical field of waste acid treatment, in particular to a recycling process for calcium-containing waste acid after acid leaching fluorite. Background technique [0002] As the grade requirements of fluorspar at home and abroad are getting higher and higher, but the impurities of fluorspar raw ore are getting bigger and bigger, resulting in a large number of flotation fluorspar concentrates that need to use chemical methods to remove various impurities, so as to produce high-purity fluorspar products (CaF 2 ≥97%). At present, the main chemical method is the acid leaching fluorite process, and in order to reduce the cost, industrial waste acid is used for treatment. Today, the current status and treatment methods of industrial waste acid mainly include: evaporation separation method, roasting method, neutralization method, extraction method, ion exchange resin method, etc. In addition, the recycling methods of waste sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/22B01D1/00C30B29/46C30B29/62
CPCB01D1/00C01F11/22C30B29/46C30B29/62C30B7/08
Inventor 张谌虎孙伟管青军陈鹏陈文辉
Owner LIUPANSHUI NORMAL UNIV
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