Alumina and Silica Produced by Chlorination of Power Plant Fly Ash Treatment

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

doi:10.1007/s11837-020-04267-5

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…In reactions with chlorine (1)-( 5) oxygen is not present, since experiments with chlorine were carried out in a stream of pure gaseous chlorine [11].…”

Section: Thermodynamic Analysis Of Reactions Of Interaction Of Ash Co...mentioning

confidence: 99%

“…The thermodynamics of the "ash -CaCl 2 -SiO 2 -O" system is considered in detail in [11]. Required amount of both chlorine and calcium chloride is determined by the composition of the ash, depending on the amount of SiO 2 , CaO, Al 2 O 3 in the ash.…”

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

confidence: 99%

“…At the same time, a significant part of carbon up to 80% of its total content in the ash passes into the magnetic fraction. The removal of iron at the initial stage of the technology into a commercial product and the provision of conditions for the conversion of aluminum into easily soluble compounds during the further process of leaching the cinder ensures the production of high-quality silica in the form of a commercial product and the maximum conversion of aluminum into solution [11]. Implementation of the proposed technology does not require large capital and material costs and can be used for processing accumulated ash and slag wastes near existing thermal power plants.…”

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

confidence: 99%

“…The paper [11] presents the theoretical features of the technology, in terms of roasting ash with CaCl 2 , and the behavior of its components during roasting and leaching of cinder. Expanding the boundaries of theoretical knowledge of the technology requires an additional comprehensive study of the behavior of carbon contained in the ash and its effect on the technological parameters of the process.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

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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.

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“…In reactions with chlorine (1)-( 5) oxygen is not present, since experiments with chlorine were carried out in a stream of pure gaseous chlorine [11].…”

Section: Thermodynamic Analysis Of Reactions Of Interaction Of Ash Co...mentioning

confidence: 99%

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

confidence: 99%

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

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

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“…The purpose of this work is to study the effect of the AlCl3 content in the initial solution, the consumption of gaseous HCl, and the behavior of impurities on the crystallization of AlCl3•6H2O from aluminium-containing salt solutions obtained after leaching the cinder of chlorinating ash roasting from thermal power plants in Kazakhstan [ [13], [14]].…”

Section: Introductionmentioning

confidence: 99%

Features of the crystallization of AlCl3·6H2O in the system AlCl3 – MeClx – HCl – H2O

Dosmukhamedov¹,

Zholdasbay²,

Kaplan³

et al. 2022

KIMS/CUMR/MShKP

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A laboratory setup has been developed to study the regularities of crystallization of aluminium chloride hexahydrate from hydrochloric acid solutions. The influence of the AlCl3 content in the initial solution, the consumption of gaseous HCl, and the behavior of impurities on the crystallization of AlCl3·6H2O from aluminium chloride solutions of leaching cinder obtained as a result of chlorinating ash burning from thermal power plants in Kazakhstan have been studied. The behavior of impurity metals in the process of crystallization of aluminium chloride solution has been studied, and their distribution between the products of the crystallization process has been established. It is shown that aluminium chloride content in the solution decreases with an increase in the consumption of hydrochloric acid. It was found that under the conditions of crystallization of AlCl3·6H2O, all impurities, except for barium, pass by 98% into the mother liquor. To reduce barium and other impurities in the obtained crystals of AlCl3·6H2O, it is proposed to carry out multiple washing of the crystals with hydrochloric acid (32% HCl). It has been shown that a decrease in the acidity of the washing solution from pH = 10 to pH = 5.5 ensures the isolation of ACH crystals with a minimum content of impurity metals, ppm: 3-5 Ca; 3-6 Fe; 1-3 Mg; 0.1-0.5 Ti; 1-3 Na; 20-30 P2O5. The moisture content of the obtained crystals is 4-5%; the particle size is 400-900 microns. As a result of mathematical processing, regression equations were constructed that adequately predict aluminium chloride content in the solution and its extraction into crystalline hydrate, depending on the consumption of hydrochloric acid. The optimal parameters of the crystallization process have been established: Т = 60 ºС, HCl concentration in the solution - 26-30%, HCl gas consumption = 0.5 l/min, duration 1 hour.

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Recent Development in Metal Extraction from Coal Fly Ash

Frýdl

Bastl

et al. 2021

Clean Coal Technologies

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Alumina and Silica Produced by Chlorination of Power Plant Fly Ash Treatment

Cited by 10 publications

References 2 publications

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

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

Features of the crystallization of AlCl3·6H2O in the system AlCl3 – MeClx – HCl – H2O

Recent Development in Metal Extraction from Coal Fly Ash

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