Integration of Kazakhstan Technologies for Silicon and Monosilane Production with the Suitable World Practices for the Production of Solar Cells and Panels

Serikkanov, Abay; Shongalova, Aigul; Zholdybayev, Kairat; Tokmoldin, Nurlan; Turmagambetov, Tleuzhan; Pavlov, Artem A.; Mukashev, B.N.

doi:10.3390/pr10071303

Cited by 7 publications

(1 citation statement)

References 38 publications

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“…Thermal models for two processes of large-scale PKK production have been seen: the Siemens process, which uses trichlorosilane (TXS) as the main product, and the liquid layer formation process using silane (monosilane, MS). These models were implemented using temperature control in laboratory reactors [20][21].…”

Section: 𝐶 + 𝑆𝑖𝑂 2 → 𝑆𝑖 + 2𝐶𝑂 (1)mentioning

confidence: 99%

Obtaining Technical Silicon From the Sand of the Quartz Deposit “Jerdanak”

Jiyanova,

Turayev,

Eshmurodov

2023

Preprint

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In this article, the chemical and mineralogical composition of the local quartz sands of Surkhandarya region was initially determined by the method of X-ray phase analysis. The sand was then washed and dried several times in distilled water for enrichment. The resulting clean sand was crushed, sifted and returned with magnesium at temperatures of 600–1800°C at intervals of 2–10 hours, technical Silicon (93%-94%) was obtained. Silicon oxide and magnesium metal for magniothermal extraction 2:1, 1:1, 1:2, 1:3, 1:4, 1:7 the goods were taken in proportions. It was washed three to four times in distilled water, hydrochloric acid, alkali to extract Silicon from the composition of the resulting reaction mixtures. The purity of the extracted Silicon was studied using X-ray phase and element Analysis. The study found that the optimum temperature for reaction of silicon oxide with magnesium was 800°C temperature, reaction duration was 6 hours, with a molar ratio of silicon oxide and magnesium of 1:2, the reaction yield showed the highest result of 98,8%.

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Section: 𝐶 + 𝑆𝑖𝑂 2 → 𝑆𝑖 + 2𝐶𝑂 (1)mentioning

confidence: 99%

Obtaining Technical Silicon From the Sand of the Quartz Deposit “Jerdanak”

Jiyanova,

Turayev,

Eshmurodov

2023

Preprint

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Silane Gas Production Through Hydrolysis of Magnesium Silicide by Hydrochloric Acid

Rasouli,

Kuhn,

Lai

et al. 2024

J. Sustain. Metall.

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Monosilane (SiH4) is a common precursor for the production of high-purity silicon for solar PV applications. As an alternative to carbothermic reduction of silica to produce metallurgical grade silicon with subsequent conversion to silane, an alternative route over magnesiothermic reduction of silica to Mg2Si has been explored in our earlier work. In the current work, silane gas production through hydrolysis of Mg2Si in HCl acid solution was studied. Two sources of Mg2Si were chosen: a commercial Mg2Si source and a Mg2Si source produced through magnesiothermic reduction of high-purity natural quartz. Effects of various parameters on the hydrolysis of Mg2Si, including different experimental setups, temperature of the acid solution, acid concentration, reaction time, and relative amounts of reactants were studied. The evolution of produced gases was determined by two different methods: firstly, by passing the produced gas through a KOH solution to capture Si with subsequent analysis of the Si content in the KOH solution by inductively coupled plasma mass spectrometry and secondly, on-line gas analysis by GC–MS. The silane distribution between different silane species with reaction time was evaluated and the activation energy of silane formation was calculated. The results indicated comparable silane yields obtained from the on-line GC–MS method and KOH solution analysis method, as well as for commercial Mg2Si and the Mg2Si–MgO mixture produced through magnesiothermic reduction. Furthermore, adding HCl acid to Mg2Si in water led to higher SiH4 formation yield than adding Mg2Si to acid. However, the total silane yield for the two methods was similar at approximately 32%. Graphical Abstract

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