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• Chemical Properties

  It appears as white powder or gelatinous crystals. It has hygroscopicity with bitter taste. It is slightly soluble in water and hot ethanol, insoluble in cold ethanol. ;

• Application

  • Used as the abrasive material of the thermosetting resin grinding wheel, the raw material of boron alloy, the fluxing agent of heat welding and brazing; it can also be used as the components of low chromic anhydride chrome and lead-tin alloy electrolyte.
  • Used as analytical reagents and fluxes, also for the production of boron trifluoride, abrasive materials for the aluminum and magnesium casting, electrochemical engineering and chemical testing.
  • Used as the fluxing agent of heat flux and brazing, and the raw material for the production of boron alloy using aluminum and magnesium casting; it acts as the filler in the heavy wheel using resin as abrasive adhesive. In the welding and fusion of silver, gold, stainless steel, it can clean up the dross of light metal. It is a raw material for the manufacture of boron trifluoride and other fluorine salts. Also used in electrochemical processes and reagents.
  • Used as fluxing agent; also used for the metallurgical industry and for the preparation of boron trifluoride as well as the raw materials of other fluorine salt.
  • Used as the resin finishing agents for textile printing and dyeing, improving agent of metal particle size and refining fluxes and the casting sand granules of the aluminum and magnesium alloy.
  ;

• Preparative Methods

  Fluoroboric acid-potassium hydroxide method:
  Hydrofluoric acid and boric acid are sent into the reactor at a ratio of 25: 6.2 (weight ratio); the temperature does not exceed 40 ℃. The reaction continues for 6h. The prepared fluoroboric acid is fed to a neutralization tank and neutralized with a 5 mol/L potassium hydroxide under stirring and cooling (until the methyl orange is discolored). Precipitated potassium fluoroborate crystal is subject to centrifugal separation, washing and drying, obtaining the finished product of potassium fluoroborate. its
  4HF + H3BO3 → HBF4 + 3H2O
  HBF4 + KOH → KBF4 + H2O
  Fluoroboric acid/potassium carbonate neutralization method: under the stirring of the coating container, apply the saturated potassium carbonate solution for neutralizing fluoroboric acid to until the methyl orange is discolored. The precipitated potassium fluoroborate is subject to centrifugal separation, washing and drying, obtaining the finished product of potassium fluoroborate. Its reaction is:
  2HBF4 + K2CO3 → 2KBF4 + H2O + CO2 ↑ ;

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