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Method for preparing potassium borofluoride through fluorine-containing wastewater

A technology of potassium fluoroborate and waste water, which is applied in the direction of boron halide compounds, etc., can solve the problems of increased cost, large environmental pollution, high price, etc., and achieve the effects of high production efficiency, reduced pollution, and good product quality

Active Publication Date: 2013-10-02
MORITA NEW ENERGY MATERIALS ZHANGJIAGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] On the other hand, fluorine-containing wastewater, as one of the main wastewater generated in chemical production, has caused great pollution to the environment.
In addition, the price of compounds containing fluorine elements is often relatively high
Therefore, enterprises usually treat fluorine-containing wastewater through wastewater treatment technology and recover fluoride in the wastewater to achieve the purpose of reducing environmental pollution and sustainable utilization of resources. The investment in wastewater treatment equipment and manpower, etc., thus greatly increasing the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, fluorine-containing wastewater produced in the production of lithium hexafluorophosphate in chemical production is used as the raw material. The basic properties of the fluorine-containing wastewater are as follows: the mass content of hydrogen fluoride is approximately 20%, and the mass content of hydrogen chloride is approximately 20%.

[0025] The specific steps of the method for preparing potassium fluoroborate from fluorine-containing wastewater are as follows:

[0026] (1) Use water to adjust the content of hydrogen fluoride in fluorine-containing wastewater until the mass content of hydrogen fluoride is approximately 15%. In actual operation, carbon steel-lined PE material storage tanks are usually used as wastewater adjustment tanks;

[0027] (2) Prepare a saturated potassium chloride solution first, then fully mix the saturated potassium chloride solution with the wastewater treated in step (1) at a mass ratio of 1:4, so that the fluorin...

Embodiment 2

[0034] In this example, fluorine-containing waste water produced in the production of lithium hexafluorophosphate in chemical production is used as the raw material. The basic properties of the fluorine-containing waste water are as follows: the mass content of hydrogen fluoride is approximately 18%, and the mass content of hydrogen chloride is approximately 18%.

[0035] The specific steps of the method for preparing potassium fluoroborate from fluorine-containing wastewater are as follows:

[0036] (1) Use water to adjust the content of hydrogen fluoride in fluorine-containing wastewater until the mass content of hydrogen fluoride is roughly 12%. In actual operation, carbon steel-lined PE material storage tanks are usually used as wastewater adjustment tanks;

[0037] (2) Prepare a saturated potassium chloride solution first, then fully mix the saturated potassium chloride solution with the wastewater treated in step (1) at a mass ratio of 1:5, so that the fluorinatio...

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Abstract

The invention relates to a method for preparing potassium borofluoride through fluorine-containing wastewater. The method is characterized by comprising the following steps: (1) utilizing water to regulate the hydrogen fluoride content of the fluorine-containing wastewater until the mass content of hydrogen fluoride is 12%-17%; (2) completely mixing the wastewater after treatment in the step (1) with potassium chloride saturated solution according to a mass ratio of (3-5):1 so as to fluorate; (3) mixing borax with the wastewater after treatment in the step (1) according to a mass ratio of 1: (3-5), and stirring so as to completely dissolve the borax; mixing solution in the step 2 with solution in the step 3 according to a mass ratio of (0.8-1.2):1, stirring to react, and continuously separating potassium fluoborate out in a reaction process so as to prepare potassium fluoborate suspension; and (5) solid-liquid separating, washing and drying the potassium fluoborate suspension in the step (4) so as to obtain a potassium fluoborate product. The potassium fluoborate product prepared by the method can satisfy the requirements of potassium fluoborate use factories.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing potassium fluoroborate from fluorine-containing waste water. Background technique [0002] Potassium fluoroborate, molecular formula KBF 4 , molecular weight 125.90, relative density (d20) 2.498, melting point 350°C, white powder or colorless granular crystal, slightly soluble in water, ethanol, ether, insoluble in alkali solution, can be decomposed into boron trifluoride by strong acid, and alkali Carbonates of metals dissolve together to form fluorides and borates. [0003] Potassium fluoroborate is used as analytical reagent and co-solvent, and is also used in the manufacture of boron trifluoride, mold material for aluminum and magnesium casting, electrochemical engineering and chemical experiments. [0004] The production of potassium fluoroborate, the traditional method is to use boric acid, hydrogen fluoride, and potassium hydroxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/06
Inventor 堀尾博英
Owner MORITA NEW ENERGY MATERIALS ZHANGJIAGANG CO LTD
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