appliion of bacterial iron reduction for the removal of iron impurities from

possibilities of bacterial leaching to remove high iron content present in kaolin. Different strains were used to leach iron from kaolin. The feed kaolin clay is highly contaminated with iron of 11% and 42% iron reduction is observed. Chandrasekhar S and Ramaswamy S [3, 14] carried out detailed

Request PDF | Removal of Fe from Kaolin Using Dissimilatory Fe(III)-Reducing Bacteria | LongYan kaolin has a large Fe content which affects the coloring. Bioleaching treatments to remove Fe ...

It was found that iron-oxidizing bacteria (IOB) enhanced ZVI oxidation by using iron as the sole electron donor. Iron-reducing bacteria (IRB) with high activity of Fe (III) reduction, also significantly accelerated rather than inhibited ZVI oxidation. ZVI oxidation activity was increased from 3.42% to 24.28% by IOB and 19.49% by IRB.

These applications include decolorization of kaolin and silica, iron removal from bauxite, recovery of iron from low-grade or difficult-to-process ores, and promoting breakdown of iron-rich rocks ...

river water and indigenous bacteria increased the bacterial reduction of iron. The Fe content in granite samples treated by bioleaching decreased by about 60 %. The process needs controlled conditions for the bacterial iron reduction and is depend-ent on the mineralogical composition of non-metallic ores.

removal by sedimentation and filtration. Viruses are the smallest waterborne microbes (20 to about 100 nanometers in size) and the most difficult to remove by filtration and other size exclusion methods. Bacteria are somewhat larger than viruses (about 0.5 to 3 micrometers) but too small to be readily removed by plain sedimentation or settling.

Direct reduced iron (DRI), also called sponge iron, is produced from the direct reduction of iron ore (in the form of lumps, pellets, or fines) into iron by a reducing gas or elemental carbon produced from natural gas or coal.Many ores are suitable for direct reduction. Direct reduction refers to solid-state processes which reduce iron oxides to metallic iron at temperatures below the melting ...

Jan 01, 2020· Dissimilatory Iron Reducing Bacteria (DIRB) in specific has found wide range of application in bio-beneficiation for removal of iron impurities from different ores and in bioremediation for detoxification of heavy metals, hazardous pollutants, etc. Numerous research works have been reported for bio-beneficiation of kaolin, bauxite by IRB.

Mar 15, 2018· Thus, PVP has four effects on the synthesis of these iron oxide powders: (1) change of the powder morphology, (2) dispersion of the powders, (3) restriction of crystal growth, and (4) limitations of oxidation. Ruiz-Baltazar et al. [3] reported that a variation in PVP amount, from PVP:Fe = 100:1 to 1.25:1, can change the powder morphology from ...

Oct 23, 2018· Iron production. After the reduction of iron ores in the blast furnace or Midrex furnace, the third step in which the production of different types of iron such as cast iron and steel, The steel industry depends on two essential processes: Removal of unwanted impurities from iron resulting from the reduction furnaces.

Recently, microbial-based iron reduction has been considered as a viable alternative to typical chemical-based treatments. The iron reduction is an important process in kaolin refining, where iron-bearing impurities in kaolin clay affects the whiteness, refractory properties, and its commercial value. In recent years, Gram-negative bacteria has been in the center stage of iron reduction ...

The iron reduction is an important process in kaolin refining, where iron-bearing impurities in kaolin clay affects the whiteness, refractory properties, and its commercial value.

for iron content, as well as to conduct color measurements. The results of the kaolin powder XRF showed 52% iron removal from kaolin by A. niger fungal isolated from pistachio skin after 14 days and 47.7% iron removal after 28 days at a temperature of 25°C and 33.8% iron removal after 28 days at a temperature of 30°C.

The presence of metal impurities such as iron in the silver salt cannot only reduce the antimicrobial properties but can even promote the growth of microbiological agents. [9] In this particular case, siderophores will be sent by the bacteria removing the impurities from the solution (Fig. 4) 222

Jul 22, 2015· An, Y. et al. Decreasing ammonium generation using hydrogenotrophic bacteria in the process of nitrate reduction by nanoscale zero-valent iron. Sci. Total. Environ. 407, 5465–5470 (2009).

The ability to remove iron by other means, such as bacterial iron reduction, may reduce costs, allow lower grade material to be mined, and improve the efficiency of mineral processing. Kaolin clay and silica sand are used in a wide range of industrial applications, particularly …

Mar 28, 2006· [1] Iron-hydroxysulfate minerals can be important hosts for metals such as lead, mercury, copper, zinc, silver, chromium, arsenic, and selenium and for radionuclides such as 226 Ra. These mineral-bound contaminants are considered immobilized under oxic conditions. However, when anoxic conditions develop, the activities of sulfate- or iron-reducing bacteria could result in mineral …

May 02, 2019· In the bacterial leaching experiments, the change values of pH medium were measured with iron removal. As a result, the changes in the pH of the environment began to decline rapidly from 3rd day as opposed to iron removal and became stable after the 15th day. The pH of the medium decreased from 5.5 to 2–2.5 and the medium became acidic.

The invention relates to a method for the removal of protein and other impurities from microbial capsular polysaccharides. More particularly, the present invention relates to isolation of microbial capsular polysaccharides in pure form after removal of protein and other impurities.

Jan 06, 2015· On the one hand, due to its high specific surface, nano-zero valent iron is much more reactive in comparison with conventional granular iron; on the other, as a result of its high reactivity, the life time of nano-zero valent iron is very low, so that further research work, for example, on surface modifications, is necessary for stabilization ...

Dec 01, 2013· Two series of bacterial iron-reduction experiments have shown that all tested Shewanella sp. bacterial strains were able to leach iron impurities from industrial kaolins and that among the tested strains, S. putrefaciens CIP8040 is the most efficient in terms of both extent of Fe removal and improvement in the colour properties of the kaolin.

Research paper Refinement of industrial kaolin by microbial removal of iron-bearing impurities Asfaw Zegeye ⁎, Sani Yahaya, Claire I. Fialips, Maggie L. White, Neil D. Gray, David A.C. Manning School of Civil Engineering and Geosciences, Drummond Building, Newcastle University, Newcastle upon …

The purpose of this work was to investigate the phenomenon of microbial iron reduction in industrial minerals and materials. These materials are generally not pure, often associated with impurities usually in the form of Fe3+. In all cases, the presence of iron affects the colour and the physical properties of the mineral and therefore lowers their industrial value and limits their application.

Oct 03, 2021· Iron bacteria – It is easy to distinguish this iron compound because of its offensive smell and slimy texture. Some iron filter cartridges may only address ferric, ferrous, and organic iron, while others can only reduce one or two types. Iron Reduction Performance. A water test will indicate groundwater iron levels in any area.

Aug 01, 2010· LongYan kaolin has a large Fe content which affects the coloring. Bioleaching treatments to remove Fe impurities were conducted here using indigenous dissimilatory Fe(III)-reducing bacteria. The factors that affect bioleaching efficiency include bioleaching time, carbon source, pH, temperature, pulp density, and inoculum density and these were examined. Environmental scanning electron ...

river water and indigenous bacteria increased the bacterial reduction of iron. The Fe content in granite samples treated by bioleaching decreased by about 60 %. The process needs controlled conditions for the bacterial iron reduction and is depend-ent on the mineralogical composition of non-metallic ores.

knowledge on the potential of iron oxide coated sand for iron and manganese removal. 20 Mwacafe plants installed in the Eastern and Greater Accra regions under a Danida funded project have been monitored to provide over four months filter run and iron, manganese and fluoride removal levels listed in table 3. Table 3.

Aug 16, 2019· Elevated iron content in low-grade kaolin is one of the chemical factors detrimental for its industrial applications. Therefore, various physical and chemical methods have been applied to decrease iron concentration in kaolin. One of the more feasible and environmentally friendly method is biobenefication via microbially-induced bioextraction. Therefore, this paper provides data on fungal ...

May 18, 2020· The iron-based nanoparticles are composed chemically either of sole metallic iron (nZVI), oxides of iron, FeO, Fe 2 O 3 or Fe 3 O 4 or metallic iron core encapsulated by thin iron oxide layers . The nanometallic iron behaves as reductant, and further because of its size, it offers large areas (in contrast to metal iron) for the adsorption ...

The results of the kaolin powder XRF showed 52% iron removal from kaolin by A. niger fungal isolated from pistachio skin after 14 days and 47.7% iron removal after 28 days at a temperature of 25 ...