Isolation of Iron in Iron-Containing Product From Ash From Burning of Ecibastuz Coal

Dosmukhamedov, N. K.; Kaplan, Valery; Zholdasbay, E. E.; Daruesh, G.S.; Argyn, A.A.

doi:10.18796/0041-5790-2021-1-56-61

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No carbon was found in the cinder, which indicates complete combustion and its volatilization in the form of CO 2 with the exhaust gases. When organizing the technology of chlorinating ash roasting with CaCl 2 to obtain cinder and further leaching it in hydrochloric acid, it is fundamental to preliminarily separate iron by magnetic separation into a commercial product [14]. In addition, conditions for converting mullite, which is not easily soluble in hydrochloric acid, present in the ash, into easily soluble aluminum compounds -anorthite and geleniteshould be provided.…”

Section: Behavior Of Carbon Under Conditions Of Oxidative Roasting Of...mentioning

confidence: 99%

Behavior of the components of carbon-containing ash from the combustion of power coals under the conditions of chlorination roasting

Dosmukhamedov¹,

Zholdasbay²,

Egizekov³

et al. 2022

View full text Add to dashboard Cite

On the basis of thermodynamic calculations of interaction reactions between mullite, oxides of titanium, iron, and Cl 2 (gas) in the presence of carbon, the values of the Gibbs free 2 energy are determined in the current work. It has been established that the probability of reactions occurring in the temperature range 1073-1473 K is very high. The most negative value ΔG°Т = -1029.9 kJ/mol is typical for the titanium oxide reduction reaction at the roasting tem-Т perature (1100 °С). The value of the Gibbs free energy of the destruction reaction of mullite (Al 2 SiO 2 2 5 ), which is important for practice, is ΔG°Т = -269.2 kJ/mol. This makes it possible to Т predict the complete decomposition of mullite from ash to easily soluble aluminum chloride under the conditions of chlorination roasting.The study of the behavior of carbon under the conditions of chlorination roasting of ash with CaCl 2 in an oxidizing atmosphere is also important. The results of the differential thermal 2 analysis of the non-magnetic fraction of ash, previously separated from the TPP ash by magnetic separation, showed clearly defined manifestations on the DTA, DTG and TG curves, caused by the presence of various types of reactions in the system. Low-temperature (20-115 °C) sample dehydration and ash dehydration were determined in the temperature range of 115-375 °C. In the range of further heating of the sample (375-685 °C), an exothermic projection was found on the DTA curve, which is characteristic of the oxidation of thermally active carbon present in the powder. The amount of carbon removed from the ash established as 6.75% by weight of the sample.

show abstract

Section: Behavior Of Carbon Under Conditions Of Oxidative Roasting Of...mentioning

confidence: 99%