HoweVer, although as 5 3. The salts are generally salts of magnesium/calcium (as in lime softening process) or those of aluminium/ferrous/ferric etc. Helps prevent scale formation in boilers, heat exchangers, and piping. Removal of permanent hardness is carried out cold with sodium carbonate which may or may not be combined with calcium and magnesium bicarbonate precipitation using lime. Magnesium oxide, using a two-stage countercurrent process, will … We are one of the worlds principal manufacturers and suppliers of high purity calcined magnesium oxide and magnesium hydroxide products. Test 5-Using magnesium sulfate. They are magnesium bicarbonate, magnesium chloride, magnesium sulfate, iron sulfate, and iron chloride. lime-soda water softening. Comparative tests show MgO to be superior to silica sand and garnet sand for the filtration of several different particulates. EFFICIENCY OF VARIOUS FORMS OF MAGNESIUM OXIDE By comparing magnesium oxide from various difference in the physical as well as the chemical characteristics of the magnesia and magnesite, a s shown by the accompanying Table V: TABLE V Turbidity Lbs./cu. - .o g su8 0.20---------------------------~ 3.10t 0.15------------------------- 8 4 8 15 tir O ---- - ---- - 8 24 57 era 0.10---------------------.---------- ap From this table, it will be noted that with an initial silica concentration in the water of 42 of p. P. M. at a temperature of 95d C., with 40 20 f p. p. M. sodium hydroxide added and 15 minutes o retention and stirring time, a mere 0.1 gram pe magnesium oxide, equivalent to 100 P. P. M., re- in duced the silica to 18 P. P. M., while an increase st in the magnesium oxide to 0.3 gram effected a further reduction in the silica to only 0.1 P. P. M., 25 or in other words a removal efficiency of Q9.9.% t Effect of temperature fr It has been found that an increase in tem- r perature results in an increase in the efficiency 30 ci of the reaction, and in the consequent removal P of silica from water by means of magnesium I oxide in the presence of a fixed proportion of a sodium hydroxide, as indicated by the accom- 35 t panying Table II: . Conditions as in test 1. This invention relates particularly to a Process for treating and urifying natural waters, nd relates more especially to the treatment of such waters as contain silica and/or its coof Pounds, such waters being distinguished from brines In which the silica, together with other impurities,... Click for automatic bibliography 2009). Hardness as CaCO3 ---------------- 36 40 P alkalinity as CaCO3 .--------------- 0 M alkalinity as CaC03' --------------- 26 Silica as S102---------------------Conditions: 45 15 minutes retention and stirring time 45 0.1 gram magnesium oxide added 40 P. P. M. sodium hydroxide added 1 liter samples of water -1P alkalinity is the titratable alkalinity to the phenol- 50 phthalell colorless end point (pH 8.3). Two applications are described where magnesium oxide can be used to purify process water in two ways: to filter out suspended solids and to precipitate dissolved heavy metals. Learn more about their applications and sol type. Magnesium oxide is the preferred chemical because it does not increase the dissolved solids concentration of the water. The results are expressed on the standard scale for measurement of turbidity as SiO2 in P. P. M. Adsorptive properties are known to increase with the degree of particle subdivision, therefore, with a smaller particle size and consequently greater turbidity, as measured above, one can expect greater adsorptive properties generally in the removal of dissolved silica from the solution. water. Magnesium oxide (MgO) is used for many applications in various industries, namely for neutralizing acidic solutions and reducing silica, hardness and alkalinity in aqueous solutions. P.P.M. In situ precipitation works much better than already precipitated magnesium, probably due to surface area of the precipitant and proximity to a silica molecule. Since silica becomes part of the magnesium precipitant, some means of adding already precipitated magnesium (magnesium oxide) or of precipitating magnesium in situ is used. By adding 0.1 gram magnesium oxide and without the aid of sodium hydroxide, the-silicd was sharply reduced to but 1.0 P. P, M., and the 78 xrently tends to decrease the hardness of the ter and also its alkalinity, with the further deable result of a decrease in the solids content. Among the aforementioned desilication agents, aluminium salts have demonstrated excellent silica … Thus, natural water and brines, such as are obtained from salt lakes and wells, are uniformly considered as cornm- 15 prising two entirely different raw materials, substances or liquids. Silica is generally present in water in the form of silicilic acid polymer. P. M. added Hardne - 25 _ _ as CaCO a 0ml$ ia31 as 10 Gram. Results confirmed that the coagulant required for silica removal in the process water is 20-50% lower than in the effluent, especially in DAF2, where the amount of suspended solids is higher and their size is smaller. Avoid taking other medicines within 2 hours before or 2 hours after you take magnesium oxide. Whereas a ratio of PProximately 24 parts or less of magnesium ide perppart of silica will effect efficient silica mov. .. . "" The residual silica even after the most diligent efforts to date, still forms a degree of impervious scale such as is extremely costly in boiler maintenance Among such efforts are those which comprise the use of salts of cadmium manganese or zinc combined with an alkali; ferrous, ferric and zinc hydroxides; and similar reagents. fciency of silica removal, coninal hardness as calcium carbonate was 124 P. P. M., and the silica 20 P. P.M. In the last two columns of Table IV 0 a 50% increase in magnesium oxide to 0.15 gram, both with 15 minutes and 60 minutes retention times, the silica removal was further increased to a net result of something less than 1.0 P. p. M. 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