Process for preparing potassium borofluoride and co-production of white carbon black and sodium fluosilicate

Abstract

The invention relates to a method for preparing potassium fluoborate with the co-product of white carbon black and sodium fluosilicate, which takes hydrofluosilicic acid, boric acid, industrial salt and potassium chloride as main raw materials and particularly comprises the steps as follows: (1) the hydrofluosilicic acid is firstly added into a leaching tank which is then preheated to 60 DEG C to 100 DEG C and then opened for carrying out stirring, theoretical quantity of boric acid is added into the hydrofluosilicic acid, then the leaching tank is obturated and reaction is carried out continuously for 2.0 hours to 6.0 hours, and leaching is carried out at the constant temperature of 60 DEG C to 100 DEC G; (2) qualified fluoboric acid solution after being leached is filtered, the white carbon black is dried after progressive concentration and washing by levels of water to produce the white carbon black; (3) the filtrate obtained and a first lotion are added with the industrial salt for purifying and disiliconization, then theoretical quantity of industrial salt is added for carrying out reaction for 10 minutes to 30 minutes to prepare sodium fluosilicate slurry; (4) the sodium fluosilicate slurry prepared is filtered, washed and dried to obtain sodium fluosilicate products, and the filtrate obtained is used for synthetizing the potassium fluoborate; (5) theoretical quantity of potassium chloride is added into the filtrate obtained in step (4) for carrying out reaction for 10 minutes to 30 minutes; (6) after the reaction in step (5) completes, filtration is carried out, an ointment is washed by primary water and dried to obtain the potassium fluoborate.

Description

technical field [0001] The invention relates to a method for preparing potassium fluoroborate co-production white carbon black and sodium fluorosilicate, in particular to a method for preparing potassium fluoroborate co-production white carbon black by using fluorosilicic acid, boric acid, industrial salt and potassium chloride as main raw materials. Carbon black and sodium fluorosilicate method. Background technique [0002] Potassium fluoroborate is widely used, mainly used as a flux for heat welding and brazing, as a raw material for aluminum and magnesium casting to produce boron-containing alloys, and as a filler in heavy-duty grinding wheels that use resin as abrasive binder. The related industries that use potassium fluoroborate have a stable scale, and the demand for potassium fluoroborate is stable, so the market for potassium fluoroborate is very good. At present, the traditional production process of potassium fluoroborate mostly uses the potassium hydrofluoric a...

AI Technical Summary

Problems solved by technology

At present, the traditional production process of potassium fluoroborate mostly uses the potassium hydrofluoric acid chloride method, or the potassium carbonate or potassium hydroxide boric acid method that is in short supply and expensive in the market, so that the production and cost of potassium fluoroborate are greatly affected by raw materials. Lack of market competitiveness; and the above two production processes have high raw material prices, high production costs, and relatively complicated production processes

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