Influence of suspended solids on silica removal by coagulation with aluminum salts. There is provided a process for replacing the magnesium oxide portion of a nature magnesium silicate with sodium oxide thereby to form sodium silicate which comprises melting a natural magnesium silicate and sodium carbonate at a temperature of from 1100° to 1350° C. until a clear melt is obtained, the molar ratio of sodium oxide derived from the sodium carbonate per mole of silica … The relative values of various forms of magesium oxide for silica removal is also generally ndicated by the degree of turbidity, while this haracteristic also offers a means for comparing nagnesia obtained from similar sources. and 100 P. P. M., and the P alkalinity CaCOS CS0O, Ca(Oa 003 40 being between 15% and 85% of the M alkalinity - - and then separating the precipitate from the p.p.M. The removal of silica by this process Is further akln to typical adsorption reactions in that the euantity of magnesium oxide that must be emloyed is not In a constant ratio to the amount of iica nitially present. These removal rates would allow working at 75-80% recovery in RO units without scaling problems. Also, when combining the hot lime-so4a. 6H2O was selected as magnesium source to analyze the effect of pH, dosage, temperature, and contact time on silica removal. Additives used to control fouling contain magnesium, silica, manganese, and/or … ft. for U. S. P. light magnesium oxid to 51.5 lbs. Magnesium oxide being prepared by the dehydration of magnesium hydroxide at 350°C showed the greatest silica removal efficiency. d Table VI has been prepared in order to graphe1 65 ically illustrate advantages possessed by the pres1 ent magnesium oxide process, as compared with e other processes, which to the uninitiated might S appear to be closely allied therewith, if not acS tually the equivalent thereof. Magnesium Oxide: Water Treatment. An object of the invention, therefore, is .to provide a Process for the economical and efficient removal of silica from heated natural water, as for instance under the conditions met with in the widely used hot-process industrial water softeners, In which the water is normally maintained at approximately 95d C. This Process is characterized by the high degree of silica removal -within a relatively short space of time, and the fact that it can be used either with the common limesoda process of water softening, or entirely Independently thereof. 32 92  8 3 2. However, while the alkalinity has thus far been maintained within reasonable limits, an increase of sodium hydroxide to 100 P. P. M. effects a considerable decrease in the hardness of the water, but with the sharp increase in alkalinity there is a pronounced decrease in the efficiency of the silica removal, so that there is under such conditions 3.0 P. P. M. remaining silica, thereby showing that too much sodium hydroxide tends to retard or inhibit the full action otherwise of the magnesium oxide. A brackish water source containing high magnesium concentration (333 mg/L as CaCO 3) for reverse osmosis (RO) was studied for silica scaling. Previous studies have demonstrated that aluminium salts, calcium oxide, and magnesium oxide are capable of removing silica (Tutus and Eroglu 2003; Ma et al. 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. 30 In the last-mentioned use, the removal of silica before the water enters a boiler is for the purpose of Preventing such silica from otherwise being deposited as siltcat6 scale, as such a de-. The MgO–SiO 2 composite prepared by aerogel method was three times higher than the MgO. Streated water. Test 3-Using commercial magnesia (source B). Among the aforementioned desilication agents, aluminium salts have demonstrated excellent silica … Test 6--Using ferric sulfate. The formed magnesium oxide on the surface was carefully dissolved in 17% aqueous hydrochloric acid. If maginum oxide is simply mixed into a slurry in a *mical mixing tank with water, It hydrolyzes to - ---- ---us m une magnesium hydroxide. The salts are generally salts of magnesium/calcium (as in lime softening process) or those of aluminium/ferrous/ferric etc. P. light magnesium oxide-----------.... 16. Quaternary ammonium theophylline-based ionic liquids and imidazolium-based ionic liquids, magnesium oxide and silica nanoparticles were used in order to investigate the interaction with Gram negative Escherichia coli and Gram positive Bacillus cereus.The changes of bacterial sensitivity to both nanoparticles (NPs) and ionic liquids (ILs) were examined. P. P.. As the temperature is increased, while all other factors re- 7 main the same, it will be seen that at 950 C., the silica was reduced to a mere 1 P. P. M. It is also interesting to note that with an increase in temperature, other factors being equal, the hardness of the water as calcium carbonate is de- 7. ased from 88 to 28 P. P. M., while the alkalinity milarly reduced, both of which factors relatto hardness and alkalinity are of prime imtance in the conditioning of water for intrial purposes. To illustrate more specifically, with no sodium hydroxide, but 0.2 gram magnesium oxide added, the silica is reduced from 22 P. P. M. to 16 P. P. M., while upon using substantially the same proportion of magnesium oxide, i. e., 0.3 gram, but adding 20 P. P. M., sodium hydroxide, there is a sharp diminution in the silica to a mere 1.5 P. P. M., and this is only slightly further reduced to 1.0 P. P. M. by doubling the quantity of sodium hydroxide. Lime softening is one of the most common methods for removing silica from water such as make up to cooling towers, make up to boilers or boiler blow down water. the much higher cost of U $. 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. 0 200 SCommercial magnesia (source A)-.------ 17.7 s Commercial magnesia (source B)....----- 21.2 210 24.7 100 Technical magnesium oxide-------- 247 144 2 Comme rcial magnesia (source C) ----- 2 134 U.