Adding aluminium powder and micro balloons

Commercial ANFO contains approximately 2-3% of micro balloons according to a couple of sources, which makes the ANFO more sensitive and thus requires only a standard blasting cap to detonate. However, commercial ANFO is much purer than the 27-0-0 CAN available to farmers.

I'm now going to mix in the AL and MB using:

45kg of ANFO

5kg of AL (I'm using 400 mesh(62 microns) leafed AL

1,2kg of micro balloons

For a total of 51,2kg per bag

The 150kg of AL came in 4 hermetically sealed drums each containing around 37kg of AL. After reading the "security precautions", however, I was completely freaked out. The drum openings where wielded with a soft metallic substance so it was not going to be easy to open them without extreme risk (I thought). According to the warnings; contact with oxygen will risk detonation of the AL, contact with metal, concrete and even plastic will significantly increase the chance of static electricity which can cause a detonation. Friction and shock can also cause detonation. Close proximity of oxidizers (gas, diesel) or close proximity to electrical outputs etc can cause detonation.

At first, I thought I would manage to create enough picric acid booster material (1,5kg in total) to disregard the addition of AL powder. But considering the fact that I only managed to produce 200-300g of booster I had no choice than to continue the AL addition.

I first planned on creating an outdoor mechanism that allowed me to thrust a steel spear like object, by using gravity, creating a 3 cm hole in the top of the drum. However, I ended up taking a regular knife and starting to file down the wielded enclosement, even if it involved high risk. Eventually, I manage to file open the enclosement. I then considered putting the drum upside down in one of my empty fertilizer bags to prevent the presence of an abundance of oxygen.

This method proved to be too exhausting since I had to hold up the 37kg drum with my hands. I ended up with putting a large 3 x 4m plastic sheet on the concrete floor and carefully pouring the AL powder out of the opening. Small clouds of dust began to generate but nothing happened. I carefully continued until the drum was empty rolling the side of the drum in a circular pattern from the center of the AL powder already poured out, until the drum was empty. There were small clouds of AL powder generated but the biggest one was aprox 20 cm in diameter, which settled down after a while. I continued after the small clouds had settled. It's also worth noting that I had closed all the windows of the cellar basement so the humidity was relatively high, while oxygen level was below average.

In any case, this method worked well and I had gathered all the AL powder on the sheet, and thus preparing it for the addition to the ANFO.

I plan to mix up 1,2kg of micro balloons per 45kg ANFO. I have a total of 40kg of MB in 5 large bags. It is a powder-like substance and inert. But according to the sources; when mixed with ANFO or ANALFO it will generate hot spots and thus making the ANFO or ANALFO more sensitive. I just hope I have the correct type of micro balloons... I assumed that the micro balloons were 2 mm in diameter but these seems to be 0,2 mm or so.

Date: 2015-12-17; view: 753