Register to reply

Practical question liquid nitrogen stump removal

by Warpspeed13
Tags: liquid, nitrogen, practical, removal, stump
Share this thread:
Warpspeed13
#1
Aug7-14, 12:51 PM
Warpspeed13's Avatar
P: 106
Ok so I need to get a 3foot stump out of concrete without damaging the concrete. It's at that terrible stage where it's to rotten to pull out and to solid to scoop out. My idea is to drill a hole and pour liquid nitrogen down the hole to make the wood brittle and then smash it with a pry bar. Will it make the wood brittle or will it make the wood stronger like it does with a banana?
Phys.Org News Partner Engineering news on Phys.org
Philips introduces BlueTouch, PulseRelief control for pain relief
3-D printing leads to another advance in make-it-yourself lab equipment
Nanoscience makes your wine better
berkeman
#2
Aug7-14, 06:52 PM
Mentor
berkeman's Avatar
P: 41,320
Quote Quote by Warpspeed13 View Post
Ok so I need to get a 3foot stump out of concrete without damaging the concrete. It's at that terrible stage where it's to rotten to pull out and to solid to scoop out. My idea is to drill a hole and pour liquid nitrogen down the hole to make the wood brittle and then smash it with a pry bar. Will it make the wood brittle or will it make the wood stronger like it does with a banana?
Unless you routinely work with liquid nitrogen, this sounds like a bad way to go.

Instead, I googled Stump Remover Chemical Home Depot, and got hits:

http://www.homedepot.com/p/Spectraci...20-4/202097353

Looks like there are standard products that do the kind of disolving that you want. Be sure to follow the directions and stay safe!
Baluncore
#3
Aug18-14, 01:53 AM
Sci Advisor
Thanks
P: 1,955
Ice can be made very strong by adding sawdust. A tree stump will not become brittle when very cold.

Spectracide Stump Remover Granules are; Potassium Nitrate 100%.
Directions for use include;
THIS IS NOT AN INSTANT PRODUCT. IT IS AN AID TO NATURAL DECOMPOSITION.
To remove stumps, drill several 1-inch holes up to 12 inches deep into stump. Then into the side of the stump, approximately 3 to 4 inches from the top, drill a 1-inch hole slanting down to connect
with the bottom of the center hole (see illustration above.) Pour approximately 4 oz of Spectracide Stump Remover Granules into each hole. Then fill with hot water to dissolve the granules. Continue to add water to the holes for several days to ensure Spectracide Stump Remover Granules dissolve completely. Allow the decomposition process to take place for four to six weeks before removing the stump.

AlephZero
#4
Aug18-14, 08:45 AM
Engineering
Sci Advisor
HW Helper
Thanks
P: 7,285
Practical question liquid nitrogen stump removal

The main issue with stump remover chemical products is that they are basically nutrients to encourage bacteria and fungi to do the job naturally. That may take a few weeks for a fairly small stump in a warm climate, or it might take two or three years.

The right tool for the job is a vertical stump grinder, but if the tree was growing through concrete that would be probably be a job for a professional, rather than hiring a grinder and hoping you don't wreck it by attacking the concrete instead of the tree.

If you want to try "100% potassium nitrate", you might be able to get it cheaper from a chemical supplier, rather than as a product sold for stump removal.
Warpspeed13
#5
Aug18-14, 10:58 AM
Warpspeed13's Avatar
P: 106
Na solved it the best way possible the thing was only about half a foot in diameter so we drilled a hole into it and poured thermite in. Turned it to charcoal and broke it out a piece at a time


Register to reply

Related Discussions
Liquid nitrogen transfer into nitrogen purged enclosure Engineering Systems & Design 2
Liquid Nitrogen Question Materials & Chemical Engineering 2
Thermodynamics question. In Dewar flask liquid nitrogen. Advanced Physics Homework 1
Liquid Nitrogen vs. Liquid Helium General Physics 2
Liquid Nitrogen Introductory Physics Homework 2