Method for preparing potassium fluoborate by recycling mother liquor

A technology of potassium fluoroborate and mother liquor, which is applied in the field of mother liquor recycling to prepare potassium fluoroborate, which can solve the problems of high processing cost, high cost, and environmental pollution, and achieve the effects of increasing yield, avoiding environmental pollution, and improving economic efficiency

Active Publication Date: 2017-04-26
南通金星氟化学有限公司
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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 solve the current potassium fluoroborate production wastewater treatment difficulty, high cost, environmental pollution and other problems, to provide a method for the preparation of potassium flu

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  • Method for preparing potassium fluoborate by recycling mother liquor

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Embodiment 1

[0035] see figure 1 A method for preparing potassium fluoroborate by recycling mother liquor of the present embodiment comprises the following steps:

[0036] (1) After the hydrofluoric acid production system undergoes reaction, pre-purification, purification, condensation, and sulfuric acid absorption, it enters the weak acid absorption device for tail gas absorption, and injects new water into the weak acid absorption device until the content of fluosilicic acid in the system is 205g After the content of / L, hydrofluoric acid is 45g / L, the solution is put into the absorption liquid storage tank;

[0037] (2) Pump the absorption liquid in the absorption liquid storage tank into the leaching tank, preheat to 91°C and keep the constant temperature, start stirring, add solid boric acid until the mass ratio of fluorine and boron in the solution is 8:1, and the feeding is completed After reacting for 2 hours, filter the above leaching solution to obtain crude fluoroboric acid sol...

Embodiment 2

[0046] see figure 1 , a method for preparing potassium fluoroborate by recycling mother liquor in this embodiment comprises the following steps:

[0047] (1) After the hydrofluoric acid production system undergoes reaction, pre-purification, purification, condensation, and sulfuric acid absorption, it enters the weak acid absorption device for tail gas absorption, and injects new water into the weak acid absorption device until the content of fluosilicic acid in the system is 150g After the content of / L, hydrofluoric acid is 5g / L, the solution is put into the absorption liquid storage tank;

[0048] (2) Pump the absorption liquid in the absorption liquid storage tank into the leaching tank, preheat to 100°C and keep constant temperature, start stirring, add solid boric acid until the mass ratio of fluorine and boron in the solution is 11:1, and the feeding is completed After reacting for 3 hours, filter the above leaching solution to obtain crude fluoroboric acid solution an...

Embodiment 3

[0057] see figure 1 , a method for preparing potassium fluoroborate by recycling mother liquor in this embodiment comprises the following steps:

[0058] (1) After the hydrofluoric acid production system undergoes reaction, pre-purification, purification, condensation, and sulfuric acid absorption, it enters the weak acid absorption device for tail gas absorption, and injects new water into the weak acid absorption device until the content of fluosilicic acid in the system is 450g / L, after the content of hydrofluoric acid is 100g / L, put the solution into the absorption liquid storage tank;

[0059] (2) Pump the absorption liquid in the absorption liquid storage tank into the leaching tank, preheat to 80°C and keep constant temperature, start stirring, add solid boric acid until the mass ratio of fluorine and boron in the solution is 6:1, and the feeding is completed After reacting for 0.5h, filter the above leaching solution to obtain crude fluoroboric acid solution and sili...

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Abstract

The invention discloses a method for preparing potassium fluoborate by recycling a mother liquor. The method comprises the steps of injecting new water into a weak acid absorption apparatus of a hydrofluoric acid production system; adjusting the content of fluosilicic acid and hydrofluoric acid in the system; adding solid boric acid into a solution to obtain a silicon dioxide byproduct and a coarse fluoboric acid solution; adding solid sodium sulfate into the coarse fluoboric acid solution to obtain sodium fluosilicate and a refined fluoboric acid solution; adding hydrofluoric acid and potassium sulfate solutions to obtain potassium fluoborate crystals and the mother liquor; and adding calcium carbonate solid into the mother liquor to obtain a calcium sulfate byproduct, wherein one part of the mother liquor is used for absorbing tail gas in the hydrofluoric acid system, one part of the mother liquor is used for dissolving potassium sulfate, and one part of the mother liquor is used for washing silicon dioxide, so that the recycling of the mother liquor of the potassium fluoborate production system is realized. The method realizes recycling of wastewater, solves the problems of difficulty in treating potassium fluoborate wastewater and high cost, is environment-friendly, and has very high economic benefits.

Description

technical field [0001] The invention relates to the technical field of potassium fluoroborate preparation, in particular to a method for preparing potassium fluoroborate by recycling mother liquor. Background technique [0002] Potassium fluoroborate is mainly used in the production of aluminum-titanium-boron alloys, fluxes for heat welding and brazing, and can also be used as fillers in heavy-duty grinding wheels with resins as abrasive binders. It is the best choice for preparing boron trifluoride and other fluorine salts. raw material. At present, the preparation process of potassium fluoroborate can be divided into the following technical routes: 1. The reaction of hydrofluoric acid and boric acid or borax to generate fluoroboric acid, and then the reaction of fluoroboric acid with potassium chloride or potassium carbonate or potassium hydroxide to obtain fluoroboric acid Potassium; 2. Using fluosilicic acid to react with boric acid or borax to generate fluoboric acid, ...

Claims

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Application Information

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IPC IPC(8): C01B35/06C01B33/10C01F11/46C01B33/12
CPCC01B33/103C01B33/12C01B35/066C01F11/46C01P2006/80
Inventor 李金懋王娟王国宏
Owner 南通金星氟化学有限公司
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