Fluoride silico

Sodium silicate and silico fluoride solutions as concrete surface hardeners 9/104... 

Both sodium silicate and silico fluoride solutions are applied to clean, dry, sound concrete floors as dilute aqueous solutions (10-15 per cent solids) in two to three applications, taking care to ensure that all material penetrates and is absorbed into the concrete surface. The silicate or silico fluoride reacts with the small amount of free lime in the cement to form glassy inert materials in the surface, and the successful application of both materials depends upon filling the micropores in the surface of good-quality concrete, leaving its surface appearance and non-skid characteristics virtually unchanged. 

The main difference between the two types are that the reaction products of the silico fluoride types are less soluble in water and are also harder, which may give better in-service performance but at a slightly higher material cost. However, with recent developments in floor-laying techniques, the concrete substrates for industrial floors are laid with much more dense low-porosity surfaces, so that neither silicate nor silico fluoride treatments are as effective as they used to be, when the concrete used had a slightly more open finish and hence was more receptive to these treatments. With modern concrete floors, it is imperative to wash any material not absorbed into the surface within a short period. Otherwise, unpleasant white alkaline deposits, which are difficult to remove, may occur. 

It is important to stress that neither sodium silicate nor silico fluoride will improve the performance of a poor, low-strength, dusty concrete floor and if the surface is too porous, there is no way that all the material applied can react with the relatively small quantity of free lime in the concrete surface. All that will happen is that the pores will be filled with non-reacted powder, producing a most unpleasant alkaline dust, which can be very irritating to the skin and eyes when the floor is put into service. 

K bicarbonate, K chloride, K iodide, K metaphosphate, K perchlorate, K phosphate, K silico-fluoride, K urea oxalate, sodium ammonium sulfate, sulfur, zinc sulfate and Zr oxide It was claimed that methylene urea reduced the flash to a far greater extent than any of the organic compounds used, ft was also stated that cerium salts were much more effective than any other metallic salts investigated (Ref 4)... 

Aluminum Fluosilicate or Aluminum Silico-fluoride, Al2(SiF6)3 mw 480.83 wh pdr si sol in cold w sol in hot w. Can be prepd by treating alumina crihydrate with fluosilicic acid. Used for prepn of artificial gems, enamels glass... 

Sodium fluosilicate (sodium silico fluoride) has been used to control ectoparasites on livestock, as well as crawling insects in homes and work buildings. It is approximately as toxic as sodium fluoride. 

Chromium Silico-fluoride, Cr2Fg.(SiF4)3, is known in solution (see p. 102). 

Hunter, G.C., Jr. Barringer, M. Spooner, G. Analysis of desensitization of dentin by sodium silico-fluoride and got-tliebis solution. J. Periodontol. 1961, 32, 333-337. 

Magnesium Fluosilicate or Magnesium Silico fluoride, MgSiFs mw 274,51 wh, ef-... 

Used as a secondary accelerator with thiazoles and sulfenamides in NR and SBR compounds. Exhibits better storage stability compared to thiuram and dithiocarbamates but is not as active. Perkacit DPG can be used in latex as a foam stabilizer in the silico-fluoride foam process. 

Ammonium Silico- fluoride Not flammable Not flammable Not flammable Not flammable Not pertinent Not pertinent Not pertinent Not pertinent No ... 

Blocking of the pores in concrete surfaces may be achieved with materials like silicates or silico-fluorides [6]. Once these materials have penetrated the pores, they react chemically with the concrete, in particular with the calcium hydroxide present, and the reaction products block the pores, as seen in Figure 14.1c. Sodium... 

Na2SiFe production unit, effluent treatment plant By product sodium silico fluoride fOT sale Dilute H2Sip6 disposal problem Na2SiFfi can give extra income... 

Beryllium chloride is usually produced by the chlorination of the pure oxide mixed with carbon, the oxide having been obtained via a sulphuric acid or silico-fluoride breakdown of beryl. However, the direct chlorination of beryl has been considered by Sheer and Korman. It is carried out by mixing the ground mineral with about 30 per cent of soft coal and fabricating into electrodes. These are continuously consumed in an electric arc furnace through which chlorine is passed. The chlorides of beryllium, aluminium, silicon and iron, etc., are collected separately, as far as possible, by selective condensation. 

As in the phosphate determination, fluoride of >2.Smmol/L decreases the coloiu intensity of the blue silico complex. Complexing the ion with boric add reduces the interference... 

The chemical adsorption of hydrofluoric acid on glass may be applied, under proper conditions, to the detection of fluoride, and also of silico-... 

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