scholarly journals Production of non-ferrous metal concentrate in the processing of pyrite slags

2021 ◽  
Author(s):  
S.V. Gladyshev ◽  
◽  
M.N. Azlan ◽  
Keyword(s):  
Sodium Hydrogen Carbonate ◽  
Raw Materials ◽  
Chemical Activation ◽  
Ferrous Metal ◽  
Sodium Bicarbonate Solution ◽  
Mineral Raw Materials ◽  
Optimum Mode ◽  
Sodium Aluminosilicate ◽  
Sodium Hydrogen ◽  
Hydrogen Carbonate

The method of preliminary chemical activation of mineral raw materials was used in the conducted studies for the complex processing of pyritic slags. The influence of preliminary chemical activation of kaolinite clays of Alexeevsky deposit in the solution of sodium hydrogen carbonate on the separation of kaolinite and quartz fractions was studied. The temperature of 150 oC, the duration of 120 minutes, and the concentration of sodium bicarbonate solution of 120 g/dm3 should be considered the optimum mode of activation. As a result of activation, the phase composition of the kaolinite fraction changed: the percentage of kaolinite fraction decreased; new phases of muscovite and sodium aluminosilicate appeared; the amount of quartz increased.

scholarly journals Research and development of a comprehensive technology for processing kaolinite clays in Kazakhstan

2021 ◽  
Author(s):  
S. Dyussenova ◽  
◽  
Ahmed A. M. El-Amir ◽  
◽  
◽  
...  
Keyword(s):  
Phase Composition ◽  
Sodium Bicarbonate ◽  
Raw Materials ◽  
Chemical Activation ◽  
Sodium Bicarbonate Solution ◽  
High Quality ◽  
Standard Methods ◽  
Mineral Raw Materials ◽  
Sodium Aluminosilicate ◽  
The Republic

In the Republic of Kazakhstan, the most promising are kaolinite clays of the Alekseevsky deposit. For effective processing of clays, it is necessary to develop special methods of processing, since satisfactory results were not achieved when using standard methods of gravity processing. The article provides the results of studies of the effect of preliminary chemical activation on the yield of the kaolinite fraction during gravitational processing. Previously, the method of preliminary chemical activation of raw materials in a solution of sodium bicarbonate has proven itself well in the processing of various mineral raw materials. It is determined that as a result of preliminary chemical activation, changes in the phase composition occurred. The dependence of the yield of the kaolinite fraction on the temperature of chemical activation, duration, and the ratio of W:T and the concentration of the sodium bicarbonate solution. Based on the results obtained, a technology for the complex processing of kaolinite clays has been developed, which provides for the preliminary chemical activation of the feedstock at the beginning of the process, which will effectively isolate high-quality kaolinite and quartz products, which will significantly reduce the flow of materials entering for sintering. As a result of activation, the phase composition of the kaolinite fraction has changed: the percentage of the kaolinite fraction has decreased; new phases of muscovite and sodium aluminosilicate appeared; the amount of quartz increased.

scholarly journals Kaolinite clays as a source of raw materials for the aluminum industry of the Republic of Kazakhstan

2021 ◽  
Vol 3 (319) ◽  
pp. 5-12
Author(s):  
B. K. Kenzhaliyev ◽  
◽  
L.M. Imangalieva ◽  
A.I. Manapova ◽  
M.N. Azlan ◽  
...  
Keyword(s):  
Sodium Bicarbonate ◽  
Raw Materials ◽  
Chemical Activation ◽  
Sodium Bicarbonate Solution ◽  
Additional Source ◽  
Kaolinite Clay ◽  
Sodium Aluminosilicate ◽  
The Republic ◽  
Enrichment Techniques ◽  
The Aluminum Industry

Kaolinite clays can serve as an additional source of alumina in the Republic of Kazakhstan. The most promising is the Alekseevsky kaolinite deposit. To obtain high-quality kaolinite and quartzite products, it is necessary to develop special enrichment techniques, since no satisfactory results were achieved when using standard methods of gravitational enrichment of kaolinites. The paper presents the results of studies of the effect of preliminary chemical activation during the processing of kaolinite clays of the Alekseevsky deposit. Previously, the method of preliminary chemical activation of raw materials in a solution of sodium bicarbonate has proven itself well in the processing of various mineral raw materials. It was determined that during the preliminary chemical activation in a solution of sodium bicarbonate, changes occurred in the phase composition of the kaolinite fraction: the content of muscovite decreased almost twice; the phase of sodium aluminosilicate was formed. The dependence of the yield of Al2O3 in the kaolinite fraction on the temperature of chemical activation, duration, and the ratio of L:S and the concentration of the sodium bicarbonate solution during chemical activation. The optimal mode of preliminary chemical activation of kaolinite clay of the Alekseevsky deposit has been established: the temperature is 150 oC, the duration is 120 minutes and the concentration of sodium bicarbonate solution is 120 g/dm3. A basic technological scheme is proposed for the processing of kaolinite clays.

scholarly journals Experiments towards the Synthesis of the Ergot Alkaloids and Related Structures. Part 7.1 Novel Syntheses of some 4-Acyl-2,3,4,4a,5,6-hexahydrobenzo[f]quinolin-2-ones

1999 ◽  
Vol 23 (2) ◽  
pp. 94-95
Author(s):  
Mark A. E. Bowman ◽  
Ralph E. Bowman
Keyword(s):  
Sodium Hydrogen Carbonate ◽  
Ergot Alkaloids ◽  
Aqueous Sodium ◽  
Sodium Hydrogen ◽  
Hydrogen Carbonate ◽  
Aqueous Sodium Hydrogen Carbonate

Reaction of the N-formyl enol-lactone 4 and the corresponding N-acetyl 10 and N-methoxycarbonyl 11 derivatives with bis(trimethylsilyl)potassiomalonate in THF at 60°C followed by treatment with aqueous sodium hydrogen carbonate and cyclisation as above, yielded the 4-formyl-, 4-acetyl- and 4-methoxycarbonyl-tricyclic ketones 7, 13 and 14 in yields of 31, 35 and 36%, respectively.

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