Adding aluminium powder and micro balloons

Mixing in aluminium powder and micro balloons in the ANFO

Time required to prepare 1 x 50kg bag of ANFO using the above method

It took around 30-40 minutes to prepare each 50kg bag of ANFO. So I spent around 3-4 nights (from 23.00 to 8.00) working this way until I was completely done. I chose to work at nighttime because I wanted to do everything I could to prevent detection. I covered the windows and closed the door on the inside (I had to install a closing mechanism on the door). Due to the loud noise made from the 4 blenders you can't really hear anyone approaching so I wrote a note on the door of the main building which encouraged them to call my mobile if they needed my presence (add a smiley<3). This work is very tedious so I had my iPod on for most of the time at max volume. I took a 5 minute break for every 2 bags I completed (so basically every 120 minutes). Occasionally, I would have to drive to the equipment building and fill up my 20L diesel containers.

I originally planned to process 2 more 600kg bags of AN prills but I was so exhausted that I decided 1800kg would have to do.

Adding 10% (by weight) of aluminium powder and 2-3% (by weight) of micro balloons will increase the sensitivity and power of your ANFO substantially. Considering the fact that we do not have access to 34-0-0 (much purer AN) I assumed adding at least the micro balloons would be required to ensure detonation.

Considering the fact that AN powder will absorb water so quickly I concluded that it would be appropriate to add the AL and MB after I had saturated the AN powder with diesel.

You now have around 36 x 50kg bags packed with ANFO

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.

Дата добавления: 2015-05-31