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ElijahLynnyesterday at 5:43 PM5 repliesview on HN

Is it possible to just figure out the ratio of rocks and put them into a grinding machine to make custom sand?


Replies

philipkglassyesterday at 6:18 PM

Yes:

"Crushed rock sand – An economical and ecological alternative to natural sand to optimize concrete mix"

https://www.sciencedirect.com/science/article/pii/S221302091...

The main problem is that even though crushing rocks is affordable, illegal sand mining is even cheaper in regions where law enforcement is weak.

xatttyesterday at 5:52 PM

Zombocom… the only limit is your imagination.

In all seriousness, rock crushing is energy intensive relative to just taking sand from the source.

show 1 reply
darth_avocadoyesterday at 9:06 PM

You’re talking about a product that’s quite literally “pick it up and sell it”. Adding a single step to the process will be economically more expensive. Mining, logging, fishing etc. are all similar examples.

Tyr42yesterday at 6:11 PM

You'd also care about angular sand vs round sand grains.

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liveoneggsyesterday at 7:33 PM

it would be better to farm coral reefs and parrot fish