00:00:00.000 [Music] 00:00:00.02000:00:00.030 hey guys so a while ago I did a video 00:00:05.15000:00:05.160 about various ways that I go about 00:00:07.75000:00:07.760 getting my Solutions crystal clear 00:00:10.40000:00:10.410 before actually precipitating the goal 00:00:12.95000:00:12.960 and what we have here as you will see is 00:00:16.03900:00:16.049 a really horrific lis polluted pregnant 00:00:20.47000:00:20.480 chloroauric acid solution so golden 00:00:23.50900:00:23.519 solution it's already been the NOx so 00:00:26.92900:00:26.939 the excess nitric acid has been 00:00:29.25900:00:29.269 converted to sulfuric acid using self 00:00:33.04900:00:33.059 emic acid and now in the past I would 00:00:37.54900:00:37.559 have diluted the solution greatly and 00:00:40.61000:00:40.620 then I would let it settle for a day or 00:00:42.77000:00:42.780 two and siphon off the clear solution at 00:00:46.85000:00:46.860 the top but I figured it's probably a 00:00:51.22900:00:51.239 good time to update my techniques a 00:00:53.06000:00:53.070 little bit and so what I've been doing 00:00:54.56000:00:54.570 for the last while is I've got a very 00:00:57.77000:00:57.780 simple vacuum filter setup I thought it 00:00:59.95900:00:59.969 might be worthwhile showing you guys how 00:01:02.36000:01:02.370 that's going to work so if you bear with 00:01:06.10900:01:06.119 me for a second let's get this underway 00:01:08.99000:01:09.000 so I'm just going to put this aside for 00:01:10.85000:01:10.860 now so we've got about 100 milliliters 00:01:13.78900:01:13.799 of a really terribly dirty solution 00:01:16.39900:01:16.409 there should contain about 3 or 4 grams 00:01:20.35900:01:20.369 of gold so that is upset is quite a 00:01:25.85000:01:25.860 large volume of solution for 3 or 4 00:01:28.52000:01:28.530 grams but it's still far smaller than I 00:01:31.37000:01:31.380 used to do back in the olden days and so 00:01:34.13000:01:34.140 my first big recommendation is to try to 00:01:36.38000:01:36.390 make as little waste as possible by 00:01:39.14000:01:39.150 using as little acid as you really need 00:01:41.78000:01:41.790 to get the job done so that 100 moles 00:01:44.30000:01:44.310 already a little bit deluded probably 00:01:46.24900:01:46.259 started as about 50 moles of 00:01:48.03900:01:48.049 hydrochloric acid okay let's get my 00:01:51.85900:01:51.869 gloves off so I'm going to start with a 00:01:55.27000:01:55.280 catch container that is just in case we 00:01:59.30000:01:59.310 have any spools or breakages and we are 00:02:03.49900:02:03.509 going to use a little vacuum flask a 00:02:07.06900:02:07.079 vacuum filter flask of this is about a 00:02:08.80900:02:08.819 250 mo 00:02:10.33900:02:10.349 and with that I'm going to use just a 00:02:12.89000:02:12.900 standard everyday kitchen type funnel 00:02:17.14900:02:17.159 it's about compared to the size of the 00:02:19.81900:02:19.829 215 or flies the funnels like big 00:02:21.77000:02:21.780 predators quite like the nice finger 00:02:24.02000:02:24.030 that I can slice as it's got a little 00:02:25.61000:02:25.620 bit of hips for the source of our vacuum 00:02:28.67000:02:28.680 and just show you that is going to be a 00:02:35.47000:02:35.480 automotive brake bleeding kit so they 00:02:39.53000:02:39.540 these automotive kids have the little 00:02:41.72000:02:41.730 motor way you're not focusing there that 00:02:45.19900:02:45.209 things up a little bit yeah a little bit 00:02:49.78000:02:49.790 unusual all right 00:02:53.03000:02:53.040 not sure what's going on with the focus 00:02:55.12900:02:55.139 of this but so we've got that little 00:02:56.65900:02:56.669 vacuum pump there that is just a manual 00:02:59.53900:02:59.549 vacuum pump and the only bit out of this 00:03:01.72900:03:01.739 kit we're really going to use is the 00:03:03.70900:03:03.719 vacuum pump and one of the bits of hose 00:03:05.95900:03:05.969 we'll get those out and we'll put them 00:03:08.89900:03:08.909 aside get our filter flask set up back 00:03:15.08000:03:15.090 here 00:03:15.64900:03:15.659 now the a lot of normal funnels that you 00:03:19.12900:03:19.139 buy deliberately try to avoid a good 00:03:22.58000:03:22.590 seal around the neck so they have these 00:03:24.31900:03:24.329 little ribs and you can go ahead and buy 00:03:28.93900:03:28.949 the glass type funnel that fits really 00:03:32.21000:03:32.220 well into the the filter flasks but I 00:03:37.11900:03:37.129 prefer to just use the standard system 00:03:39.69900:03:39.709 now obviously putting a normal filter 00:03:42.86000:03:42.870 paper in this funnel is going to be 00:03:45.89000:03:45.900 pointless so what we're going to do is 00:03:48.46900:03:48.479 we're going to make a Charmin plug which 00:03:50.89900:03:50.909 is a plug a filter material that's going 00:03:53.89900:03:53.909 to sit in the bottom of the funnel here 00:03:56.47900:03:56.489 and it will lit basically no solution go 00:04:01.03900:04:01.049 through up into the point where we have 00:04:03.58900:04:03.599 that setup and we apply a little bit of 00:04:05.50900:04:05.519 vacuum through here so for the plug 00:04:08.71900:04:08.729 today I am going to use there's a 00:04:12.58900:04:12.599 standard cheap 00:04:16.18000:04:16.190 Supermarket have non-scented plain white 00:04:21.17000:04:21.180 paper Dells I'm going to grab a couple 00:04:24.62000:04:24.630 of sheets like that I can just start 00:04:28.97000:04:28.980 folding them a few times over and over 00:04:30.83000:04:30.840 and over the idea being that when we put 00:04:36.35000:04:36.360 that into the funnel we want it to be 00:04:40.18000:04:40.190 substantially difficult to to get it 00:04:43.64000:04:43.650 through the funnel so give it a twist 00:04:46.58000:04:46.590 like that see if I can start getting it 00:04:51.10000:04:51.110 yes you can see I'm just basically 00:04:53.33000:04:53.340 squeezing that as well as rotating it so 00:04:56.63000:04:56.640 get as much of it into the funnel as we 00:04:58.94000:04:58.950 can 00:05:06.16900:05:06.179 trying to pull as much of it through as 00:05:08.63900:05:08.649 possible obviously the tighter you can 00:05:12.05900:05:12.069 make this fit in there the better the 00:05:14.07000:05:14.080 whole system is going to work and what 00:05:17.72900:05:17.739 you want to try and avoid is to have 00:05:20.90900:05:20.919 your spiral too loose so that material 00:05:23.24900:05:23.259 that you want to try and filter out can 00:05:25.52900:05:25.539 actually make its way in a spiral down 00:05:27.43900:05:27.449 then it's usually a good idea to just 00:05:29.90900:05:29.919 use some scissors and chop off any 00:05:32.79000:05:32.800 excess down the bottom and then the top 00:05:36.47900:05:36.489 and just squish it with your fingers to 00:05:41.44900:05:41.459 get it really and into that into that 00:05:45.32900:05:45.339 neck of the finalist tight as you can 00:05:46.79900:05:46.809 get it 00:05:47.39900:05:47.409 okay now I'll show you how fast this is 00:05:51.32900:05:51.339 so we have already decided that there's 00:05:54.32900:05:54.339 going to be not a seal up the top here 00:05:56.69900:05:56.709 which is going to make this whole setup 00:05:58.94900:05:58.959 not work particularly well with vacuum 00:06:00.54000:06:00.550 so to create a seal there I'm just going 00:06:03.98900:06:03.999 to use some of this stuff is called blue 00:06:07.16900:06:07.179 tack in New Zealand it's also called pre 00:06:09.20900:06:09.219 stick in other parts of the world it's 00:06:10.73900:06:10.749 basically that kind of gray putty type 00:06:15.41900:06:15.429 stuff so essentially get rid of there so 00:06:19.31900:06:19.329 you're see where I can put this so you 00:06:21.50900:06:21.519 guys can see what I'm going to do 00:06:23.14900:06:23.159 basically we want to make a want to make 00:06:26.99900:06:27.009 a ring that is the same diameter as the 00:06:32.50900:06:32.519 as the inside of our filter flask so 00:06:37.82900:06:37.839 that it's it's kind of on there like 00:06:40.16900:06:40.179 that and then when we grab the funnel 00:06:42.86900:06:42.879 and we push on the funnel you will see 00:06:45.83900:06:45.849 that it's pushed some of the material 00:06:48.47900:06:48.489 into the glass and then we can just go 00:06:51.02900:06:51.039 round while squeezing on the top just 00:06:54.22900:06:54.239 press on the side and that's going to 00:06:56.85000:06:56.860 make a nice a nice airtight seal okay 00:07:03.38900:07:03.399 now 00:07:05.18000:07:05.190 that is quite good mix tape and attach 00:07:11.48000:07:11.490 the vacuum pump that one to our house 00:07:20.00000:07:20.010 off-camera but that's done and attach 00:07:23.60000:07:23.610 the other end of the hose to the filter 00:07:29.36000:07:29.370 funnel now I have seen some people do 00:07:31.84000:07:31.850 similar things to do this without buying 00:07:35.51000:07:35.520 an actual filter flask but the reality 00:07:38.81000:07:38.820 is this is about a $20 item that will 00:07:42.02000:07:42.030 have almost an infinite life as long as 00:07:44.60000:07:44.610 you look after it so I wasn't really 00:07:46.96000:07:46.970 worried about that so much okay now 00:07:51.11000:07:51.120 let's just grab a little bit of water 00:07:53.96000:07:53.970 and just wait that down a little bit 00:08:00.46000:08:00.470 okay and once again put some water in 00:08:04.94000:08:04.950 there now so I'm just squeezing haven't 00:08:08.03000:08:08.040 touched any solutions yet so I'll put 00:08:10.34000:08:10.350 the gloves on in a second for that but 00:08:13.61000:08:13.620 that's looking pretty good 00:08:14.72000:08:14.730 and now let me just quickly grab my 00:08:18.56000:08:18.570 gloves and then we'll get some solution 00:08:20.15000:08:20.160 into it now the idea is going to be to 00:08:24.56000:08:24.570 not include not increase the volume of 00:08:27.35000:08:27.360 this of the solution too much so I'm 00:08:30.74000:08:30.750 going to pour the solution and let that 00:08:33.68000:08:33.690 filter through completely under vacuum 00:08:35.51000:08:35.520 and then I will wash it out with water a 00:08:38.06000:08:38.070 couple of times so my hundred Mullis 100 00:08:41.30000:08:41.310 milliliters of solution is probably 00:08:43.52000:08:43.530 going to end up in the just start 00:08:46.85000:08:46.860 looking up the Arish 100 millimeters the 00:08:50.42000:08:50.430 solution is probably going to end up 00:08:51.86000:08:51.870 being about 150 or so okay so we've got 00:08:55.25000:08:55.260 the solution there get rid of watch 00:08:57.98000:08:57.990 gloss these things are terrible I've 00:09:00.92000:09:00.930 broken probably about ten of them over 00:09:03.68000:09:03.690 the last couple of years they must be 00:09:06.59000:09:06.600 keeping some watch glass factory in 00:09:08.12000:09:08.130 business so be careful of those just 00:09:13.07000:09:13.080 going to give the thermometer a spray 00:09:15.08000:09:15.090 down there make sure none of the 00:09:18.95000:09:18.960 solution track over with a thermometer 00:09:21.61000:09:21.620 okay now we're going to pour the 00:09:24.02000:09:24.030 solution 00:09:28.49900:09:28.509 to merits 00:09:34.84000:09:34.850 really horrific looking stuff just came 00:09:37.63900:09:37.649 to is that I 00:09:44.44000:09:44.450 play like that okay now you will notice 00:09:51.79000:09:51.800 we've got solution up here 00:09:53.47000:09:53.480 nothing yet filtering through the vacuum 00:09:56.82900:09:56.839 pump as you will see has no vacuum it so 00:09:59.41000:09:59.420 what I'm going to do is I'm going to 00:10:01.18000:10:01.190 start pumping initially what I'm doing 00:10:03.04000:10:03.050 is I'm pumping all the air out of the 00:10:04.72000:10:04.730 system but pretty soon all the air will 00:10:08.59000:10:08.600 be gone and you will start drawing a 00:10:10.24000:10:10.250 vacuum now I have decided to limit that 00:10:13.42000:10:13.430 limiters to about 1 inch of mercury for 00:10:16.66000:10:16.670 no particular reason and as you will see 00:10:19.00000:10:19.010 if you look there and some solution is 00:10:22.03000:10:22.040 starting to work its way through that 00:10:23.56000:10:23.570 plug and quite slowly at this point but 00:10:26.23000:10:26.240 once it works its way through things 00:10:28.60000:10:28.610 will speed up a bit now at this point I 00:10:31.66000:10:31.670 know a lot of people are concerned that 00:10:33.43000:10:33.440 they're going to be sitting there and 00:10:35.49000:10:35.500 squeezing the vacuum pump all day I'm 00:10:38.80000:10:38.810 not quite sure what they're doing wrong 00:10:41.86000:10:41.870 but they're doing something wrong I 00:10:43.60000:10:43.610 suspect that they've got problems with 00:10:45.37000:10:45.380 their ceiling up here because I can 00:10:48.10000:10:48.110 basically do those few squeezes and 00:10:51.50900:10:51.519 realistically there's no leaks in the 00:10:53.62000:10:53.630 system so the vacuum is not going to go 00:10:55.32900:10:55.339 anywhere so that's going to stay pretty 00:10:57.00900:10:57.019 much right there so I can put this down 00:10:58.44900:10:58.459 in a few minutes or let's say 10 minutes 00:11:01.96000:11:01.970 maybe 15 I'm going to have to come back 00:11:04.48000:11:04.490 and give that a few more pumps but 00:11:07.65000:11:07.660 that's not really that big a problem it 00:11:10.75000:11:10.760 only takes 2 or 3 pumps and as you will 00:11:13.90000:11:13.910 see we have now got some solution coming 00:11:17.47000:11:17.480 through the filter there you will notice 00:11:23.07900:11:23.089 that it's dropping quite slowly but the 00:11:26.47000:11:26.480 key here is that the solution is coming 00:11:28.48000:11:28.490 out very very very clean obviously the 00:11:32.38000:11:32.390 solution has already had time to cool 00:11:34.12000:11:34.130 which means that any salts that can stay 00:11:38.41000:11:38.420 in a warm solution but are going to come 00:11:40.42000:11:40.430 out when it cools already precipitated 00:11:42.25000:11:42.260 out they should be filtered out no 00:11:44.29000:11:44.300 problem so I I think probably the best 00:11:48.69900:11:48.709 bit of this wind is if I line that up a 00:11:51.55000:11:51.560 little bit better is I will sit this 00:11:56.02000:11:56.030 time lapse and it can just sit here and 00:11:58.85000:11:58.860 filter just for your reference it is now 00:12:01.31000:12:01.320 exactly 8 o'clock 8 p.m. here so I so we 00:12:05.57000:12:05.580 can ever look at how long it basically 00:12:07.10000:12:07.110 takes to Salter this hundred milliliters 00:12:08.90000:12:08.910 of solution but this is not really 00:12:11.84000:12:11.850 something that I have to sit here for it 00:12:14.54000:12:14.550 can just it can just do its thing until 00:12:17.24000:12:17.250 it's finished and as I said I'll have to 00:12:19.85000:12:19.860 come by every 15 minutes or so and give 00:12:21.71000:12:21.720 this pump a few squeezes but you'll see 00:12:24.47000:12:24.480 at a time that I've been talking it's 00:12:26.12000:12:26.130 not really gone down substantially it'll 00:12:28.28000:12:28.290 just it'll just basically sit there 00:12:31.19000:12:31.200 holding its vacuum because there's no 00:12:33.35000:12:33.360 air leaks in the system so yeah I'll put 00:12:36.80000:12:36.810 it on time lapse a bit and be back when 00:12:39.95000:12:39.960 we're finished of this and I think we 00:12:42.32000:12:42.330 might do a live precipitation on camera 00:12:45.20000:12:45.210 ok look you guys later 00:12:55.73000:12:55.740 you 00:12:59.73000:12:59.740 okay so definitely not my most exciting 00:13:02.92000:13:02.930 video so far so it's about 10 o'clock 00:13:06.01000:13:06.020 now so a couple of hours have gone by 00:13:08.92000:13:08.930 and I probably pop by once every 40 00:13:12.46000:13:12.470 minutes or so to to give the vacuum pump 00:13:16.78000:13:16.790 a few squeezes and you'll see it's if I 00:13:20.67000:13:20.680 get a better vacuum going again now and 00:13:24.90000:13:24.910 fold it up so we're at about 200 00:13:27.91000:13:27.920 milliliters of solution now so I have 00:13:30.03000:13:30.040 diluted this substantially to wash any 00:13:34.12000:13:34.130 excess solution out of the paper and and 00:13:38.11000:13:38.120 the kind of remaining junk up above and 00:13:41.32000:13:41.330 what we have here is a very nice clear 00:13:47.02000:13:47.030 solution I'll see if I can get a bit of 00:13:51.43000:13:51.440 illumination in there it's kind of hard 00:13:53.38000:13:53.390 to glue may that's probably giving you 00:13:56.77000:13:56.780 some idea of the clarity of the solution 00:13:58.84000:13:58.850 so what I'll quickly do so that pretty 00:14:03.37000:14:03.380 much rounds off the whole concept of a 00:14:07.24000:14:07.250 simple cheap effective vacuum filter 00:14:10.39000:14:10.400 system and so what will quickly do now 00:14:12.94000:14:12.950 is I know that we're probably looking at 00:14:15.94000:14:15.950 about three to four grams of gold in 00:14:17.92000:14:17.930 there 00:14:18.31000:14:18.320 so I will measure out eight grams of 00:14:22.33000:14:22.340 sodium metabisulfite and we'll just add 00:14:24.61000:14:24.620 that in the dry form and see if we can 00:14:27.01000:14:27.020 see a nice reaction to round off this 00:14:28.78000:14:28.790 night so I'll just get this over to a 00:14:31.24000:14:31.250 beaker and we'll give that a gap okay so 00:14:34.90000:14:34.910 I've got the solution transferred to the 00:14:37.69000:14:37.700 beaker but a bit of speculum ination and 00:14:40.06000:14:40.070 I'm just going to slowly add the eight 00:14:42.13000:14:42.140 grams of sodium metabisulfite I prefer 00:14:45.43000:14:45.440 to add this as a solid powder at the 00:14:49.63000:14:49.640 time just because it doesn't actually 00:14:51.19000:14:51.200 increase the amount of solution 00:14:55.11000:14:55.120 especially the more solution you end up 00:14:58.45000:14:58.460 with the more white stuff going we're 00:15:00.07000:15:00.080 going to have to treat okay so 00:15:04.46000:15:04.470 we've got it in there see that out and 00:15:12.72000:15:12.730 what we'll do is 00:15:19.04000:15:19.050 give it a quick stir hopefully we should 00:15:22.13000:15:22.140 see a bit of the reaction happening 00:15:23.93000:15:23.94000:15:35.03000:15:35.040 not superfast but as you can see we are 00:15:40.38900:15:40.399 going quite round there 00:15:48.61000:15:48.620 this fear of that 00:15:52.82000:15:52.830 like there's something like that 00:16:08.36000:16:08.370 yeah and that's pretty much it for the 00:16:12.22000:16:12.230 for the precipitation I can already see 00:16:15.01900:16:15.029 a little bit of gold floating at the top 00:16:18.35000:16:18.360 there and I would guess that the golden 00:16:23.09000:16:23.100 this is going to drop relatively quickly 00:16:26.21000:16:26.220 seeing as it's quite concentrated and 00:16:31.54000:16:31.550 there should be a reasonably clean 00:16:34.51900:16:34.529 solution there was it was obviously 00:16:36.29000:16:36.300 green because there's a little bit of 00:16:37.57900:16:37.589 copper in there of the gold but yeah 00:16:40.40000:16:40.410 look forward to seeing all those cars 00:16:42.12900:16:42.139 anyway hope you guys enjoyed this little 00:16:44.60000:16:44.610 video and good luck in visa
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