Content Of Iron Compounds Research Articles

Radial differentiation of chemical composition of cryogenic soils in the Chara river valley, north of Transbaikalia

The subject of the study is the content of iron compounds and their radial differentiation in the profiles of cryogenic soils of the Chara River valley (Transbaikalia). The studied soils belong to post-pyrogenic permafrost gleyzems, the depths of the seasonal active‐layer of these soils are from 34 to 44 cm. Macronutrient concentrations, with the exception of Si, rarely exceed 5.0%, while the silicon content reaches 24.3%. Si is also characterized by removal from the upper part of soil profiles and accumulation in permafrost soil horizons. The highest concentrations are characteristic in the O horizons (Mg – 4.8 and Ca – 1.5 mg/kg) for a significant part of the macroelements. The trace elements, Sr and Zr are distributed vary contrastingly (from 5.0 to 29.7 and from 5.6 to 47.1 mg/kg). Values of the R coefficient from 0.3 to 0.9 indicate the initial stage of post-pyrogenic restoration of soil properties, and the active accumulation of Mg, Ca, Ti, Fe, Sr, and other elements in the upper part of oxidized-gley permafrost gleyzem observed in the profile is a sign of active restoration. The soils contain about 3.4% iron, which more than 60–75% is the silicate group of compounds (Feс). The moisture content of soils and the prevailing reducing environmental conditions contribute to the formation of monotonous distributions in their profiles, and in soils without signs of stable hydromorphism, permafrost horizons contain almost 2 times more Feox and Feextr.

Comparative evaluation of the coagulation methods effectiveness in the extraction of biologically active components from highly concentrated effluents

A characteristic feature of highly concentrated effluents is the presence of valuable components - biologically active substances, which are secondary raw materials. The effectiveness of physico-chemical coagulation and electrocoagulation methods in relation to highly concentrated wastewater from a poultry processing enterprise, as well as the prevention of the secondary pollution of the effluent supplied to biological treatment, were analyzed in the work. The objects of the study included poultry stock (suspended solids 1770.0 mg / dm3, dry residue 1920.0 mg / dm3, chemical oxygen demand (COD) 1769.0 mg O2 / dm3), iron (III) FeCl3 chloride, iron soluble electrodes as the coagulant. The objectives of study involved determination of wastewater treatment effectiveness by the studied methods (physico-chemical coagulation and electrocoagulation) with the priority indicators changing: suspended solids, dry residue, chemical consumption of oxygen, iron, chlorides, and the precipitated residue mass. As a result of testing of highly concentrated effluents with a COD index of at least 1700.0 mg O2 / dm3, it was found out that during physico-chemical coagulation with FeCl3 at a concentration of 0.75 g / dm3, the content of priority indicators decreased by no less than 60%, while the effectiveness of electrocoagulation in relation to reducing the concentration of priority indicators was at least 70%. The content of iron compounds in wastewater with the application of electrochemical coagulation was 2.08 mg / dm3, which is 34% lower than after treatment of the effluent with iron (III) chloride FeCl3 at a concentration of 0.75 g / dm3. The chloride concentration did not change. As a result of the treatment of the effluent during the coagulation of (III) FeCl3, the secondary contamination of the treated effluent and the isolated products with iron and chlorides took place. This aspect may adversely affect the subsequent biological wastewater treatment, as well as lead to a decrease in the quality of the isolated product and its use limitation. Electrocoagulation is a more preferred way of isolating valuable components in relation to physico-chemical coagulation.

Investigation of ultrasonic treatment of wastewater from iron compounds

The high level of wastewater pollution in the mining and metallurgical industries by compounds of heavy metals, including iron, enhances their migration into the environment. Due to the lack of universal high-performance and inexpensive methods of wastewater treatment and purification, the development of new technologies is very relevant. The article discusses the possibility of wastewater treatment by ultrasonic coagulation of iron compounds in a suspended colloidal state. It has been shown that the frequency of ultrasound does not affect the coagulation rate. The concentration of iron compounds in wastewater is inversely proportional to the intensity of ultrasound. It was also found that the dependence of the residual content of iron compounds on the processing time is extreme, which is associated with the formation of agglomerates and their subsequent destruction. The results obtained served as the basis for the development of the technological scheme.

Thermal stability of limestone with a low iron content

The thermal stability of reagent-grade calcite and limestone samples with high and low content of iron compounds was compared. The causes of the revealed differences were discussed.

Sulfoxide concentrates from crude oil feedstock

The water solubility and thermal stability of sulfoxide concentrates obtained by oxidation of Arlan Crude Oil Diesel fuel cuts with hydrogen peroxide followed by separation of sulfuric acid were investigated. A dependence was found between the cutpoints and water solubility of the sulfoxide concentrates obtained from these cuts. The effect of the degree of oxidation of the sulfides and content of iron compounds in the feedstock on the quality of the sulfoxide concentrates was examined.

Cobalt Content of Iron Compounds and Its Possible Relation to Treatment of Anemia

SummaryA selection of common laboratory compounds of iron has been analyzed and found to contain significant, though extremely variable, quantities of cobalt. The possible significance of this finding in the treatment of certain types of anemia is discussed.