Melting aluminium heat sinks into an oozing ingots 

Was pretty neat to see you squeeze the liquid metal out of the ingot.

"weeping ingots" lol kind of an interesting effect. Nice melt.

To figure out Zinc or Tin content in your Aluminium, you could try a density calculation, seeing as Zn/Sn are about 3 times denser than Al. I've about 150-200kg of stamped cans (2 estate cars full), and the scrapyards stopped taking them a year ago, so I follow you with interest, and am considering taking up melting over the winter.

Brand new to your channel. Like what was posted before, I too have never seen a zinc heat sink. However, if you are ever in doubt as to whether or not a pile of aluminum has some zinc in it, try to find pieces that are the same size and shape. Zinc will be much heavier. I was tearing down a computer server for aluminum and copper. The hard drive mounts were all the same size and shape, but I noticed that some were much heavier than others. I made sure to melt the heavier ones separate from the rest. Sure enough, as I melted down the heavier mounts, I started seeing yellow coming out of my furnace. I poured the metal into the muffin tin I often use for ingot making. Side by side, the zinc ingot looked very much like my aluminum ingots; however, the zinc was three times heavier than an aluminum one ingot of the same size. I hope my experience turns out to be helpful to you.

Actually in process starting to melt my self thanks for videos very intresting i want to try sand casting also

part of me feels you didn't wait long enough for the ingot to cool down, that's why it did that

Not all aluminium is equal. Extruded aluminium ( your heat sinks) are different to cast aluminium ( the casing you added) and there are lots of different cast aluminium alloys. Cast aluminium alloy has other elements added to change its properties. iron, silicon, magnesium, copper, zinc, and manganese can be added to aluminium to make it stronger, wear resistant , heat resistant and its ability to be cast. Your bar remained liquid because you released it too early. Keep your extruded aluminium separate from your cast aluminium. If you want to cast something with detail use the cast aluminium not the extruded metal. Cool video though. I have subscribed and rung the bell. How to tell. Extruded aluminium will bend or deform. Cast aluminium will snap off or fracture.

try melting it all again and let it cool in the crucible, the zinc then goes to the bottem because it's denser. tap a screw in the top part of the alluminium and remelt at low heat (420celcius) and pull out the alluminium then all there's left is molten zinc.......i think ;-)

Hi, bigger ur ingot is...longer its gonna take to solidify, before to drop it in water...nice vid

Well it looked like it was half the weight of the same size bar. It’s hard to say from this side of the screen. When I melt stuff down, if it has zinc in it I know right away from the yellow smoke and the distinct smell.

If you got yellow smoke at all, then you had zinc burning off most likely, not a good thing if you aren't wearing a respirator mask for long exposures. Even as that ingot was cooling in the mold you started to see some yellow forming on the mold. The very first piece you put in the bowl as you were weighing it up looked like it may have been a zinc/alum alloy just by color, but you can normally tell based on weight to size ratio. Ultimately if you have zinc in what you are melting you just don't want to get it so hot that it goes from a liquid into a gas state, IE yellow smoke.

Mistakes what Mistakes I melted those thanks for your time and video

Thanks for sharing

The ingot was probably not fully solidified

Nice ingots

most all heat sinks are aluminum some mixed with copper have never seen a zinc one before my guess is the ingot was not cool enough before you released it

Due to aluminium being non incandescent when it melts, it's not always easy to know when it solidifies after pouring. A frosted surface is no guarantee as you discovered! The temperature to which the melt was heated and the depth of the mould you pour it into will determine how long it takes to set.

This ingot is awesome kkk

Zinc is going to be noticeably heavier than aluminum. In fact, nearly three times the weight of aluminum.

I’ve done that too, not enough cooling time in the mold.

Another nice melt mate give my channel a look silver fox castings 👍

I'm new to your channel and I just wanted to say that I can't read what your scale is reading and what ever you are writing in your binder is too far off and I can't read that one either . Like your melting of brass , copper and aluminum