Utilization of waste fluosilicic acid (in two parts) by Henry E. Blake, Jr. [and others]
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Utilization of waste fluosilicic acid (in two parts) by Henry E. Blake, Jr. [and others]

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Published by U.S. Dept. of the Interior, Bureau of Mines in Washington .
Written in English

Subjects:

  • Fluosilicic acid

Book details:

Edition Notes

11

The Physical Object
Pagination60 p.
Number of Pages60
ID Numbers
Open LibraryOL22007212M

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  40, tons of fluosilicic acid is recovered from phosphoric acid plants, and then used primarily in rvater fluoridation, sometimes after being processed into sodium silicofl uoride. The removal of fluosilicic acid ions in acid wastewater silicon etched by potassium salt. the remove flu silicic acid in waste acid and the utilization of the metal ion is the maximum;(2) The. Fluosilicic acid (FSA) is obtained in large quantities as a by-product from wet phosphoric acid and phosphate fertiliser plants. Today only a minor part of this acid is utilised. It is therefore not surprising that many attempts have been made to produce hydrofluoric acid using FSA as a raw material. PRODUCTION FROM FLUOSILICIC ACID Received Ma ; reviewed; accepted Studies were performed on the potential for purification of silica, precipitated as a by-product in the course of hydrofluoric acid production, and its possible use as an elastomer filler. The process underwent in the fluosilicic acid-sulphuric acid system.

recovered from industrial waste streams. An estimated 8,–10, metric tons of fluorspar are recovered each year from uranium enrichment, stainless steel pickling, and petroleum alkylation. To supplement fluorspar supplies, fluorosilicic acid is recovered from phosphoric acid .   A better environmental alternative is to use scrubbers to remove fluorides as fluosilicic acid prior to condensing the vapors in barometric condensers. If a market cannot be found for the fluosilicic acid, it can then be neutralized with phosphate rock to produce a weak phosphoric acid.   EXPERIMENTAL CALCIUM FLUORIDE PRODUCTION Experimental set-up and procedure For the production of CaF2 from waste fluosilicic acid solution, according to the flow sheet shown in Fig. 3, waste fluosilicic acid solution containing % H2SiF6 was transferred to a plastic reaction vessel which was placed in a thermostated water bath (Fig. 4).   But what comes away as the most surprising aspect of his account is how the type of fluoride used in water fluoridation is actually just fluosilicic acid, a toxic byproduct of aluminum smelting and other heavy industrial processes. It becomes clear here that the waste is being dumped into the water supply in lieu of having to dispose of it in.

concentrates the FSA. The diluted sulphuric acid is stripped of residual HF in a stripping column with steam and air and is then recycled back to the phosphoric acid plant. The AHF production plant has to be attached to a phosphoric acid plant to close the loop of sulphuric acid and water. This is shown as a block diagram in figure 1. Fig. 1. Select PRODUCTION OF SYNTHETIC FLUOR-SPAR FROM WASTE FLUOSILICIC ACID: Paper delivered during the Conference Book chapter Full text access PRODUCTION OF SYNTHETIC FLUOR-SPAR FROM WASTE FLUOSILICIC ACID: Paper delivered during the Conference.   During the reaction of phosphate ore and sulphuric acid, silicon tetrafluoride (SiF 4) and HF are formed as gases are usually scrubbed with water, forming fluorosilicic acid, H 2 SiF 6 (FSA) as a waste stream. Until recent years, FSA was mostly used for drinking water fluorination and for the production of Aluminium Fluoride (AlF 3) or, in most cases, was neutralised or. A procedure is presented for utilization of waste silicas from hydrogen fluoride synthesis and aluminum fluoride production. A method of purifying silica from fluorine impurities is given. Results of studies on application of by-product silicas from the fluorine processing as fillers for rubber mixtures and urethan elastomers is given.