Biochemical Method of Iron Removal and its Effect on the Color Characteristics of Porcelain Stone

Fe(III) Bioreduction in a Kaolin Suspension in Storage

“…Ashby's medium was used as the nutrient medium [8]. The seeding material comprised a stable cenosis of aerobic and anaerobic microorganisms separated beforehand from Prosyanovskoe kaolin and maintained by repeated seeding on the kaolin suspension enriched with Ashby's nutrient medium.…”

“…The chemical composition of kaolin was determined with the use of an SMR-25 x-ray fluorescence spectrometer. For diagnostics of the iron present in the kaolin and the structural state of the iron the oxalate-soluble iron Fe ox was determined by means of Tamm's reagent [8].…”

“…An equation presented in [8] was used to calculate the value showing the activity pe of the electrons in the suspension:…”

“…A KLY-2 kappameter was used to measure the magnetic susceptibility c, and the procedure described in [8] was used to determine the reduction capacity.…”

“…But, unfortunately, the need to maintain the purity of the cultures of the microorganisms introduced complicates the technological process of removing iron [1]. Since iron-reducing microorganisms are common in the environment [6], the most practical variant is to use naturally occurring microorganisms separated beforehand from natural sources, which have already adapted to local conditions [7,8]. To support the development of natural types of microorganisms participating in iron reduction there is no need to sterilize the initial raw material (sterilization is an expensive process and unrealistic under production conditions).…”