Red Mud as an Additional Source of Titanium Raw Materials

In this study the extraction of titanium from bauxite residue (red mud) with 2 step acid leaching was proposed. In the first step red mud was leached with diluted hydrochloric acid under stirring to remove the soluble Ca, Na, Al, Si and K at 25 0C and pH=3 for 1 hour. The content of iron and titanium in the solid residue increased to 57.7% and 6.4%, respectively. The factors influencing sulfuric acid leaching of the solid residue in the second stage were examined by factorial design. The optimal iron and titanium extraction efficiency was obtained after leaching at 50 oC and L:S ration 20:1 for 90 min when 80 g/L sulfuric acid was used. The titanium oxide content in the concentrate obtained under the optimum conditions amounted to 46.7%. The maximum recovery of titanium in the sulfuric acid solution has not exceeded 6%. Keywords: red mud, acid leaching, TiO2, iron extraction, precipitation, comprehensive utilizatio

Alkali Fusion-Leaching Method For Comprehensive Processing Of Fly Ash

Fly ash, composed of mullite, hematite, amorphous silica and quartz, is a promising source for the recovery of alumina and silica. Desilication with help of NaOH and alkali fusion-leaching method and utilization of alumina and silica in the fly ash for preparation of sodalite and silica white were explored in this research. The samples were characterized by using wet chemical analysis and X-ray diffraction. The optimal extraction of SiO2 from Reftinskaya power plant fly ash was 46.2% with leaching at 95 oC for 3 h. Sodalite was synthesized at 200 °C for 1 h followed water leaching at 95 °C for 1 h. Silica white with specific surface area 180-220 m2/g was prepared by carbonation of the Na2SiO3 solution at 40 oC for 90-120 min. The as-prepared silica has a purity of 98,8%. The proposed method is suitable for the comprehensive utilization of the fly ash. Keywords: fly ash, alkali fusion, desilication, sodalite, silica white, carbonization, comprehensive utilizatio

Modern notions of health of newborns from mothers with gestational diabetes mellitus

The aimed of the study was to research of health of newborns from mothers with gestational diabetes mellitus. Methods: The study included 210 pregnant women with gestational diabetes mellitus (GDM) and 200 without disorders of carbohydrate metabolism, who gave birth during the period: II quarter of 2017 III quarter of 2018 in the maternity ward of the city clinical hospital No. 29 named after N.E. Bauman in Moscow. This was a prospective case-control study. Results: One of the leading problems of the early neonatal period was morpho-functional immaturity: more than half of the children from mothers with GDM were born with signs of immaturity - 115 (54.8%). In the "on insulin therapy" group, children were 5 times more likely to have cardiomyopathy than those from mothers who were on a diet. With the same frequency in the control group, and for newborns from mothers with GDM, heart defects occurred: 20 (9.5%) and 24 (12.1%), respectively (p> 0.05). The main part of them were small (valvular) heart defects: defects of the interventricular and interatrial septums (18 (8,6%) in GDM group). Conclusion: The level of health in the early neonatal period of newborns from mothers with GDM in modern conditions is determined mainly by morpho-functional impairments. The incidence of newborns from mothers who were on insulin therapy was higher than from mothers who only had a diet. © Advanced Scientific Research. All rights reserved