Synthesis of silicon

Preparation of elemental silicon

Silicon is prepared by reduction of silica (sand) with aluminium.

Preparation of silicon

Preparation of silicon

The reaction, mixture consists of 90 g of dried sand, 100 g of aluminum powder and 120 g of flowers of sulfur, all thoroughly mixed and placed in a clay crucible imbedded in sand. The reaction is started with a thin layer of magnesium powder and a fuse of magnesium ribbon. Much sulfur dioxide escapes during the process: the necessary heat is generated by the reaction between the aluminum and the sulfur. The broken pieces of slag are treated with water under the hood to hydrolyze the aluminum sulfide; the hydrous aluminum oxide and crystalline alumina are easily separated from the grey-black metallic regulus and smaller globules of silicon.

The metal is allowed to stand with concentrated hydro­chloric acid for several days with occasional renewal of the latter until all the excess aluminum has dissolved, leaving a loose mass of silicon leaflets. The crystalline mass is boiled for two hours with more of the acid, drained, and then transferred to a platinum or plastic beaker. The product is treated with 10 ml portions of concentrated hydrofluoric acid until no more silica dissolves and then drained, washed well with water, and dried at 100°C. Yield 20-25 g.

Inorganic laboratory preparations, by G. G. Schlessinger, 2, 1962





InChI Key


Canonical SMILES


MeSH Synonyms


Depositor-Supplied Synonyms

SILICON, Silicone, Silicon tetrahydride, Monosilane, 7440-21-3, Silicon metal, Silicon dust, Defoamer S-10, Flots 100SCO, UNII-Z4152N8IUI, Polyeristalline silicon powder, CCRIS 6599, CCRIS 6831, HSDB 5033, HSDB 6351, EINECS 231-130-8, EINECS 232-263-4, UN1346, UN2203, 7803-62-5, Silicon, containing more than 99.99 per cent by weight of silicon, 90337-93-2, Silicon atomic absorption standard solution, silicio, Silicium, Silizium, Silan, Silicon powder, NanoFET, Silane, compressed, Silicon, elemental, NanoFET-PIP, Nanode-40, AC1NUU7K, Silicon powder, amorphous, 14Si, KSC377Q3L, Monodispersed silicon nanowires, Polydispersed silicon nanowires, 215619_ALDRICH, 267414_ALDRICH, 267422_ALDRICH, 316822_ALDRICH, 333891_ALDRICH, 343250_ALDRICH, 475238_ALDRICH, 633097_ALDRICH, 646687_ALDRICH, 647101_ALDRICH, 647535_ALDRICH, 647543_ALDRICH, 647675_ALDRICH, 647705_ALDRICH, 647764_ALDRICH, 647772_ALDRICH, 647780_ALDRICH, 647799_ALDRICH, 647802_ALDRICH, 647810_ALDRICH, Z4152N8IUI, SILICON, 99.85%, CHEBI:27573, CTK2H7835, 316822_FLUKA, MolPort-003-926-360, LTBB002482, UNII-5J076063R1, ANW-36474, AKOS004909675, AKOS024438062, RTR-024033, AN-19417, SC-81756, LS-145138, LS-145326, TR-024033, 5J076063R1, FT-0630551, Silane, compressed [UN2203] [Flammable gas], Silane, compressed [UN2203] [Flammable gas], 3B4-2161, I14-60155, Silicon powder, amorphous [UN1346] [Flammable solid], Silicon powder, amorphous [UN1346] [Flammable solid], 13537-07-0, 152284-21-4, 157383-37-4, 160371-18-6, 17375-03-0, 71536-23-7, 72516-01-9, 72516-02-0, 72516-03-1

Removed Synonyms

SILANE, Silicane, Silicones, Silicon hydride, Silicon, isotope of mass 31, BLRPTPMANUNPDV-UHFFFAOYSA-N, EPA-E5244751, CID5461123, D012825, D012828, SI, 13825-90-6

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