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Is This Something To Do With Coal ?

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neilep (OP)

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Is This Something To Do With Coal ?

« on: 20/05/2023 15:53:00 »

Coal Slag ?

Our house was built circa 1928 and had a coal bunker built in. Found this whilst doing gardening today....coal slag ?

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Petrochemicals

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Re: Is This Something To Do With Coal ?

« Reply #1 on: 20/05/2023 17:44:02 »

Iron work slag is very hard, sort of tungsten carbide hard. Slag and clinker has been used for many years as hardcore and pathways driveways etc, so probably that. Clinker is also used as soil stabilisation in Civil engineering.

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Re: Is This Something To Do With Coal ?

« Reply #2 on: 22/05/2024 08:30:42 »

could be this
calcined petroleum coke

https://www.qfindustrial.com/low-sulfur-pet-cokecalcined-petroleum-coke-price-for-carbon-product/

« Last Edit: 22/05/2024 08:33:21 by nicephotog »

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Re: Is This Something To Do With Coal ?

« Reply #3 on: 29/05/2024 13:14:07 »

Quote from: Petrochemicals on 20/05/2023 17:44:02

Iron work slag is very hard, sort of tungsten carbide hard.

Blast furnace slag has a hardness of 6 to 7 (on the Mohs scale).
https://www.sandblasters.co.uk/iron-silicate-medium-j-blast-blasting-slag-abrasive-media-460-p.asp

Less than hardened steel (7 to

, never mind tungsten carbide (9 to 9.5).

This is what PC calls "repetitive antagonism" in his signature.

It is a lot harder than limestone, but ...

Having said that, the knobbly rock in the OP does look like fused ash from a coal fire.

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