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In general microorganisms such as chemolithotrophic and chemoorganotrophic bacteria cyanobacteria algae fungi and lichens living on and in stone material may be of importance in biodeterioration These groups contribute substantially to the deterioration of mineral materials such as natural stone concrete ceramics and glass The attack on mineral materials may be
·The assay of the beneficiated slag after washing and calcinations attains 95% TiO 2 In the present work the target was to realize the dissolution of the Rosetta beach ilmenite concentrate and Titania rich slag as reductant in dilute sulfuric acid to prevent the hardness of the pulp in the reactor and
·The aim of our research is to improve low grade silica from quartz sand by removing impurities especially aluminum and iron removal using sulfuric acid leaching In order to achieve the aim the effect of reaction time and sulfuric acid concentration on the leaching process was investigated
·Copper slag a waste solid produced in the copper smelting process is a high quality secondary resource with huge output The recycling and utilization of copper slag is of great interest because it avoids the loss of valuable metals and the threat of harmful metals and saves a lot of natural resources and energy This paper firstly reviews the main methods for
·Kinetics study of leaching calcification roasted vanadium slag with sulfuric acid was critical to increase vanadium extraction Maximum leaching ratio of 93% was obtained in optimal condition of 15% sulfuric acid as leaching agent with particle size smaller than 75 μm at
·The sulfuric acid leaching reactions progressed fast and under a solid to liquid ratio of 1 10 the leaching efficiency of vanadium reached around 84% at 313 K and pH in less than 30 min
·The results show that titanium recovery of pct was obtained under the conditions of sulfuric acid mass fraction of 50 pct ratio of acid to slag of 1 reaction temperature of 160°C and
analysis showed that the main metal components when the Ti bearing blast furnace slag is roasted with concentrated sulfuric acid could be converted to sulfate From these analyses it can be seen that under strong acid conditions the major metal components could react to form sulfate and the effective
penetration depth of sulfuric acid a possible curing process of sulfuric acid on vanadium bearing stone coal ore with different particle sizes was shown 2 RESULTS AND DISCUSSION Effects of Curing Parameters on the Vanadium Leaching Effects of Initial Curing Sulfuric Acid Concentration The influence factors on vanadium leaching
Acid solutions were prepared using sulfuric acid 95 97% dissolved in reverse osmosis water to obtain a solution with a pH of 1 The prepared cement paste specimens with different mix proportions were immersed in the sulfuric acid solutions The pH of the acid solutions was measured daily by using a pH meter
An energy efficient route was adopted to treat titanium bearing blast furnace slag TBBFS in this study Titanium aluminum and magnesium were simultaneously extracted and silicon was separated by low temperature sulfuric acid curing and low concentration sulfuric acid leaching The process parameters of sulfuric acid curing TBBFS were systematically studied Under the
·This study focuses on an improved leaching process through the combination of pressurized conditions and direct filtration of acid leaching slurry which is conductive to improving the filterability of acid leaching systems and the extraction rates of Ti Al and Mg components The effects of sulfuric acid concentration reaction temperature particle size of materials
·the formation of silicic acid in accordance with Eqs I through 3 Therefore short duration 15 min leaching studies were carried out with relatively dilute sulfuric acid solutions followed by decantation and washing steps to recover the metal values Agitation was maintained at 200 rpm Typical results are given in Table 3
·Ultrasound also enhances the efficiency of physical processes such as ore washing and solid/liquid separation In the study of Bese copper recovery from slag with sulfuric acid ferric sulfate mixture was investigated in the absence and presence of ultrasound Under the optimum conditions of 65 °C reaction temperature M sulfuric acid
·In order to extract vanadium from LD Linz Donawitz converter slag of steelmaking plant an alkaline roasting acid leaching study was carried out and the effect of different parameters on the
·The dumping of a large amount of steel slag not only wastes metal resources but pollutes the ecological environment In this study a method for recovery of vanadium titanium iron magnesium and synthesizing anhydrite from steel slag is proposed The leaching efficiency of V Ti Fe and Mg was % % % and % respectively under
·Upgraded slag or UGS is produced by high pressure acid leaching of sulfate slag The production of synthetic rutile includes solid state reduction of ilmenite and leaching of reduced ilmenite under atmospheric Becher process or high pressure conditions Benelite process Tronox s KZN Sands operation includes a mineral sands mine and a
·The initial step of pyrite oxidation in the presence of atmospheric oxygen is described in Eq is a pH controlled reaction with oxidation initiated around pH 6 Evangelou and Zhang 1995 Oxygen directly reacts with pyrite and forms Fe 2 This is subsequently oxidised to Fe 3 Eq 2 Ferric iron has a low solubility around neutral pH but as
·Recovery of Magnesium from Ferronickel Slag to Prepare Magnesium Oxide by Sulfuric Acid Leaching Were the metal extractions evaluated for the washing stages with hot sulfuric acid and included in the calculations prior to quantify η 1 η 2 and η = Mg leaching efficiencies "Recovery of Magnesium from Ferronickel Slag to Prepare
·The reason is that the lithium content in the overhaul slag is relatively low and the minimum amount of sulfuric acid is enough to completely transform the lithium compound into NaLi SO 4 More aluminum compounds are converted to NaAl SO 4 2 when m H 2 SO 4 /m overhaul slag increase from to
·The synergistic mechanism of sulfuric acid and ammonium sulfate on metal extraction by roasting is as follows ① Before roasting sulfuric acid partially destroys the surface structure of ferronickel slag particles forming more pores and channels creating conditions for the rapid diffusion of ammonium sulfate and sulfuric acid into
·A new process of mechanical activation hydrochloric acid leaching concentrated sulfuric acid decomposition water leaching separation of Fe 3 with EDTA during hydrolysis was proposed to prepare high purity TiO 2 from Panzhihua results demonstrated that the process is inexpensive environment friendly and promising in
