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Potassium borofluoride preparation method based on fluosilicic acid and boron rock

A technology of potassium fluoroborate and fluorosilicic acid is applied in the field of preparation of inorganic fluorides, which can solve the problems of high production cost, high price, shortage of borax boric acid supply, etc. Effect

Inactive Publication Date: 2009-05-06
HUNAN NONFERROUS FLUORIDE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional production process of hydrofluoric acid requires the use of non-renewable strategic reserves - fluorite, borax and boric acid are also in short supply, the price is high, and the production cost of the traditional production process is high

Method used

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  • Potassium borofluoride preparation method based on fluosilicic acid and boron rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: add fluorosilicic acid 6.2m in leaching tank 3 , the concentration is 10%, boron ore (B 2 o 3 15%) press B 2 o 3 Add in molar ratio of 1:0.8 to fluosilicic acid; leach at 95°C for 180 minutes, filter, add 300kg of N-type impurity remover to the filtrate to remove impurities for 60 minutes, and filter to obtain refined liquid, which is mixed with 2.5m 3 Potassium chloride solution (200g / l) was synthesized for 80 minutes at a reaction temperature of 70°C, then filtered, washed, separated, and dried to obtain 385kg of potassium fluoroborate product.

Embodiment 2

[0026] Embodiment 2: add fluosilicic acid 6.2m in leaching tank 3 , the concentration is 20%, boron ore (B 2 o 3 10%) press B 2 o 3 The molar ratio with fluosilicic acid is 1:1.2; leaching at 85°C for 140 minutes, filtering, adding 620kg of N-type impurity remover to the filtrate to remove impurities for 120 minutes, and filtering to obtain a refined solution, which is the same as 4.8m 3 Potassium chloride solution (220g / l) was synthesized for 90 minutes at a reaction temperature of 40°C, then filtered, washed, separated, and dried to obtain 950kg of potassium fluoroborate product.

Embodiment 3

[0027] Embodiment 3: add fluorosilicic acid 6.2m in leaching tank 3 , the concentration is 15%, boron ore (B 2 o 3 40%) press B 2 o 3 The molar ratio to fluosilicic acid is 1:0.6; leaching at 60°C for 300 minutes, filtering, adding 500kg of N-type impurity remover to the filtrate to remove impurities for 180 minutes, and filtering to obtain a refined solution, which is the same as 3.0m 3 Potassium chloride solution (250g / l) was synthesized for 150 minutes at a reaction temperature of 85°C, then filtered, washed, separated, and dried to obtain 770kg of potassium fluoroborate product.

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Abstract

The invention relates to a preparation method of potassium fluoroborate based on fluosilicic acid and boron ore. The leaching of the boron ore is carried out by using the fluosilicic acid, a potassium fluoroborate product is synthesized by filtering, removing impurities and refining; the steps are as follows: I the fluosilicic acid and the boron ore are selected to produce leaching solution; II the leaching solution is filtered, the residues are removed and filtrate is remained; III an N-type impurity removal agent is added in the filtrate to remove the impurities, the impurities are removed by filtration and refining solution is remained; IV potassium chloride is added in the refining solution to carry out synthesis reaction; V the solution is filtered to obtain a potassium fluoroborate ointment; and VI the potassium fluoroborate ointment is dried to obtain the product. The prepration method adopts the technical proposal of: leaching the boron ore from the fluosilicic acid, filtering, removing the impurities, refining and finally synthesizing the potassium fluoroborate product by using the refining solution and the potassium chloride solution, thereby overcoming the shortcomings that the traditional production process of the potassium fluoroborate uses the non-renewable strategic reserve-fluorspar, borax and boric acid are in short supply, the price is higher, the production cost of the traditional production process is high, and the like. The preparation method is applicable for preparing prepare inorganic fluoride and especially applicable for preparing the potassium fluoroborate by using the fluosilicic acid and the boron ore.

Description

technical field [0001] The invention relates to the preparation of inorganic fluorides, in particular to a method for preparing potassium fluoborate based on fluosilicic acid and boron ore. Background technique [0002] Potassium fluoroborate is mainly used in the production of aluminum-titanium-boron alloys, or as a flux for heat welding and brazing, or in the casting of aluminum and magnesium, as raw materials for making boron trifluoride and other fluorine salts, and for electrochemical processes and reagents. At present, the traditional production process of potassium fluoroborate is as follows: first generate fluoroboric acid by reacting hydrofluoric acid with borax or boric acid, and then neutralize with potassium carbonate, potassium hydroxide or potassium chloride to obtain potassium fluoroborate. The traditional production process of hydrofluoric acid requires the use of non-renewable strategic reserves - fluorspar, borax boric acid is also in short supply, the pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12
Inventor 刘建良廖志辉李飞跃朱崇高刘东晓段立山黎志坚
Owner HUNAN NONFERROUS FLUORIDE CHEM
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