Ferroboron: Colemanite Reduced by Ferrosilicon above 2000 °C in an Arc Furnace (Hansen, GE, US 982,135, 1911)

Ferroboron should carry little carbon, so Hansen reduced the boron mineral colemanite with silicon instead of coke. The silicon takes the oxygen, joins the lime as a calcium silicate slag, and the boron goes into the iron of the ferrosilicon. Result: ferroboron, low in carbon, under a clean slag. Source: Hansen, US 982,135 (1911). Not given: weights, boron content. Picture drawn by Youblob.

高级

1 day

说明

Dehydrate the colemanite at 450 °C

Heat colemanite to about 450 °C in a suitable container to drive off its water.

此步骤所需材料：

硬硼钙石1 as required

所需工具：

马弗炉

Powder and mix with ferrosilicon

Grind it and mix with powdered ferrosilicon: enough silicon to reduce all the boron and slag off the lime. The amount depends on the silicon content of the ferrosilicon.

此步骤所需材料：

硅铁1 as required

所需工具：

研钵与研杵

Bind and press into pellets

Mix the powder with a binder, e.g. water glass, and press it into pellets.

所需工具：

水玻璃（硅酸钠溶液）

压丸机

Reduce above 2000 °C

Heat the pellets above 2000 °C, e.g. in a Moissan arc furnace (a ferrosilicon-type resistance furnace also works). Silicon reduces the boron; the calcium silicate slag separates cleanly from the ferroboron.

所需工具：