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I claim 1. A process for the treatment of fly ash derived from petroleum of bituminous products to recover vanadium oxide present in the ash by the formation of a soluble vanadate comprising reacting the ash with a solution of caustic soda containing 1 to 5 moles of Na 2 O per liter for the period within the range of 4-8 hours and a temperature within the range of between 50°C and the
It is also known to utilize the fly ash however as a source of alkali for removal of SO 2 from the flue gas and in such case the system flow chart is as follows ##STR2## In the utilization of fly ash as a source of alkali the fly ash is acid leached and in general the lower the pH of the leaching solution the more alkali will be removed
The process of extracting aluminum oxide from fly ash has been studied by both institutions in domestic and oversea mainly are methods of alkali sintering and acid leading.Among them acid leading method is the prime choice of comprehensive fly ash utilization. 2 Experimental 2.1 Agentia Material and Instrument
Another process described in U.S. Pat. No. 4 130 627 to Russ et al dated Dec. 19 1978 heats the fly ash in an aqueous alkali solution to form an aqueous blend. The blend is filtered to recover an alkaline solid which is then contacted with hydrochloric or hydrofluoric acid to form soluble salts of iron aluminum and other metals which can
The silica white was prepared using fly ash as raw material. It comprised alkaline fusion of fly ash followed by extraction with hydrochloric acid. The acid concentrations reaction time S/L
I claim 1. A process for the treatment of fly ash derived from petroleum of bituminous products to recover vanadium oxide present in the ash by the formation of a soluble vanadate comprising reacting the ash with a solution of caustic soda containing 1 to 5 moles of Na 2 O per liter for the period within the range of 4-8 hours and a temperature within the range of between 50°C and the
As seen in Table 1 above fly ash although differing somewhat in its chemical makeup generally has sufficient alkali cations for an SO 2 scrubbing system. The fly ash can be preliminarily tested to determine if it has sufficient alkali cations for use in such scrubbing system by extraction of fly ash samples and titration to determine the theoretical alkali available in the fly ash used.
23 Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process Hydrometallurgy 2016 24 A novel process for synthesis of tobermorite fiber from high-alumina fly ash Cement and Concrete Composites 2016
· process. Fly Ash is extracted from the flue gases discharged from the combustion processes by electrostatic and mechanical extraction. Physical state Particulate Component Average by weight Particle density (specific gravity) 1.8 to 2.4 SiO 2 45 to 51 Solubility in
· The first commercial alumina (AI20 3) extraction from bauxite was attributed to Henri Sainte-Claire Deville3 about 1854 whereupon the price of aluminium quickly tumbled to a thirtieth of its price. This method soon gave way to that of Karl Joseph Bayer4 in 1888 and the Bayer Process caused a
The reactive silica of fly ash as that fraction of SiO2 which is soluble after treatment with hydrochloric acid and with boiling potassium hydroxide solution. The quantity of reactive silica is
· Abstract Coal fly ash is a lightweight incombustible particulate generated during coal combustion. Alumina content in the fly ash is present in the mullite phase and its high stability calls for alternative processing for conversion to reactive phase before leaching. Mechanical activation with sodium hydroxide was found unsatisfactory for the breakdown of mullite structure whereas the
· The first process hereafter called sequential acid-alkaline leaching (SAAL) is a two-stage process which involves (i) a H 2 SO 4 leaching step for the preferential extraction of reactive aluminium over silicon followed by (ii) the preferential extraction of silicon over aluminium from the resulting residues using NaOH.
The invention relates to a method for extracting soluble potassium sulfate by using orthoclase. The method comprises the following steps smashing and uniformly mixing the orthoclase limestone ardealite and a roasting auxiliary roasting at the high temperature of DEG C smashing leaching and evaporating to obtain crystals of the soluble potassium sulfate product wherein the
· Coal fly ash (CFA) as the main byproduct of coal combustion enriches REEs in some areas of the world. In this paper a two-stage hydrometallurgical process (alkali fusion-acid leaching) was developed to recover REEs from CFA. The CFA was firstly roasted at high temperature with Na 2 CO 3 addition followed by the leaching step. The effects of
· SCMT4 Las Vegas USA August 7-11 2016 Feasibility Study of Municipal Solid Waste Incinerator Bottom Ash as Geopolymer Precursor . Weiping Zhu1a Xu Chen2a Leslie J. Struble2b and En-Hua Yang 1b . 1School of Civil and Environmental Engineering Nanyang Technological University Singapore 639798.
· 4. Analysis of Ash and Minerals . 4.1 Introduction. The "ash content" is a measure of the total amount of minerals present within a food whereas the "mineral content" is a measure of the amount of specific inorganic components present within a food such as Ca Na K and Cl termination of the ash and mineral content of foods is important for a number of reasons
· A new process of alumina extraction from coal fly ash in solid state in high temperature fluidized bed has been proposed in our laboratory. As shown in Fig. 3 the main step of this process includes granulation calcining washing crystallization and calcining.Ammonium aluminum sulfate is the key intermediate product for preparation of high-purity aluminum oxide.
23 Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process Hydrometallurgy 2016 24 A novel process for synthesis of tobermorite fiber from high-alumina fly ash Cement and Concrete Composites 2016
The acid-alkali catalyzed two-step method was used. The sample was then modified and dried. low silicon content in the rice husk ash is too low. The simple and economical way of extracting SiO2 from the rice husk ash is the key to developing the technology. 193. CONCLUSION In this paper four preparation methods of silica aerogels by water
· The pH value of fly ash is 12.15 because of its alkaline nature. The EC value of fly ash is 57.68 mS/cm which is 287 times higher than for the soil used in Taghipour and Jalali . This demonstrates that a large amount of soluble salt exists in fly ash and thus increases the difficulty in immobilization.
I claim 1. A process for the treatment of fly ash derived from petroleum of bituminous products to recover vanadium oxide present in the ash by the formation of a soluble vanadate comprising reacting the ash with a solution of caustic soda containing 1 to 5 moles of Na 2 O per liter for the period within the range of 4-8 hours and a temperature within the range of between 50°C and the
The silica white was prepared using fly ash as raw material. It comprised alkaline fusion of fly ash followed by extraction with hydrochloric acid. The acid concentrations reaction time S/L
· process could begin with direct synthesis of Na-P1 resulting in an extract with higher Si levels that produces pure zeolite 4A when combined with a secondary source of Al. The efficiency of silicon and aluminum extraction from fly ash effluent generation and the quality of the produced zeolites were assessed in processes A and B. However it is
· Alumina extraction from coal fly ash (CFA) by Na 2 CO 3 activation-acid leaching method could make Al 2 O 3 and SiO 2 in CFA achieve high value utilization simultaneously which shows wide application prospects. The large consumption of Na 2 CO 3 however limits its industrial application.A novel process of alumina extraction from coal fly ash by "Pre-desilicating—Na 2 CO 3 activation
Another process described in U.S. Pat. No. 4 130 627 to Russ et al dated Dec. 19 1978 heats the fly ash in an aqueous alkali solution to form an aqueous blend. The blend is filtered to recover an alkaline solid which is then contacted with hydrochloric or hydrofluoric acid to form soluble salts of iron aluminum and other metals which can
· EXTRACTION OF A l–S iMASTER ALLOY AND ALUMINA FROM COAL FLY ASH A. Liu a Z. Shi a K. Xie a X. Hu a B. Gao a M. Korenko b Z. Wang a a School of Metallurgy Northeastern University Shenyang China b Institute of Inorganic Chemistry Slovak Academy of Sciences Bratislava Slovakia (Received 16 June 2016 accepted 16 January 2017) Abstract Coal fly ash from coal power
The invention relates to a method for extracting soluble potassium sulfate by using orthoclase. The method comprises the following steps smashing and uniformly mixing the orthoclase limestone ardealite and a roasting auxiliary roasting at the high temperature of DEG C smashing leaching and evaporating to obtain crystals of the soluble potassium sulfate product wherein the
· The efficiency of the extraction process for each step was examined. In addi-tion the results of the microwave-assisted sequential extraction are compared to the results obtained by standard ASTM method. The mobility of most elements contained in the fly ash is markedly pH sensitive.
· Reactive solid aluminosilicate is typically derived from industrial by-product such as fly ash and alkali activator solution is commonly alkali metal hydroxide or silicate solution (Provis 2014). Davidovits was the first to introduce the term geopolymer in 1970s (Davidovits 1979) but the technology of alkali-
· The silicon and aluminum extracted from fly ash was used for the synthesis of pure zeolites. This can be achieved by (1) The fly ash was fused with sodium carbonate to remarkably improve its solubility of silicon and aluminum in alkali solution (2) the fused fly ash was dissolved with small amount water for desilicification.
A process flowsheet has been developed for the extraction of alumina from fly ash and production of a by-product calcium silicate for the regeneration of NaOH to make the process industrially