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Post by photoman290 on Jun 5, 2014 11:24:10 GMT -8
i have just brought 25kgs of molochite 200 not sure of the spec. made by imeries so will have a look. i suspect it is local cornish china clay. i am away for a few weeks but if you want any to experiment with i can let you have some to play with. this getting a long way from red bricks and cob.! but hopefully it will produce something worthwhile.
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Post by photoman290 on Jun 5, 2014 11:25:57 GMT -8
pouring though a 5 micron bag filter Will not work. The finer particles are already sieved out and will be sold at a higher price, that is how the mesh system works. Cement qualty is measured in Blaine (specific surface area (cm2 / g). The higher the value the higher is the chemical reactivity. Should not be below 2200 cm²/g. If one divides a 1cm cube with 6cm2 into cubes with each half the side lenght then the resulting 8 cubes will have double the original surface 12cm2. Assumed the density is 1g/cm3 the 400 mesh will result in bout 350 Blaine. Standard Portland has 3000-3500 Blaine, which equals about 2 micron or less. The particles are irregularly shaped, thus the actual Blaine value of the 400 mesh might be higher, but even if it would be four times the value would still be relatively small. The chemical reactivity of normal kaolin may be due to the much larger surface as high or even higher as 400 mesh metakaolin. |
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Post by photoman290 on Jun 5, 2014 11:32:31 GMT -8
sorry didnt explain myself very well. what i meant was put some of the 200 molochite in a ball mill and test the resulting product by filtering it though a 5 micron bag filter to gauge how long it takes to mill it to 5 micron. or if 400 mesh will work mill it till it all passes though that.
i know some fine powders will explode, not sure if molochite will. just a thought.
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Post by photoman290 on Jun 5, 2014 13:47:04 GMT -8
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Post by Deleted on Jun 5, 2014 23:06:53 GMT -8
Do you think that if we calcine Kaolin or any of these other clays he mentions in a rocket fired kiln we could make our own MK-750? Yes. Clay is defined as minerals with particles of 2 microns and below. In purified clays as sold by pottery suppliers all sand and silt is removed. Plastic or fat refers to especialy fine particles, meager or poor to not quite as fine. Kaolin is on the meager side. A fat white clay with high kaolinite content and no iron would be a good starting point and could be sufficient even without calcination. A high shear mixer is required to ensure that all the particles will be separated. |
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Post by Deleted on Jun 5, 2014 23:08:35 GMT -8
As I have said, particle size is the key. |
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Post by smarty on Jun 5, 2014 23:31:46 GMT -8
ARGICAL-M 1200S is an artificial pozzolana (metakaolin). It is obtained by micronising and calcining a kaolinitic clay from the Charentes basin.
ARGICAL-M 1200S is a dehydroxylated aluminium silicate. Its general formula is Al2O3.2SiO2. It is an amorphous non-crystallised material, constituted of lamellar particles ARGICAL-M 1200S est une pouzzolane artificielle (métakaolin), obtenue par broyage et calcination d’une argile kaolinique du bassin des Charentes.
ARGICAL-M 1200S est un silicate d’alumine déshydroxylé, de composition générale Al2O3.2SiO2. C’est un matériaux amorphe, non cristallisé, dont les particules présentent une forme lamellaire
PRODUCT USE
Additive for concretes, mortars and coatings, made from Portland cement or lime Domaine d’utilisation
Additif pour bétons, mortiers, revêtements à base de ciment Portland ou de chaux
CHEMICAL ANALYSIS
Analyse chimique SiO2
Al2O3
K2O + Na2O
Fe2O3
TiO2
CaO + MgO
LOSS ON IGNITION
Perte au feu
TYPICAL PHYSICAL CHARACTERISTICS
55 % 39 % 1,0 % 1,8 % 1,5 % 0,6 %
1 %
Caractéristiques physiques moyennes
pH 6
Pozzolanic index (Chapelle test) / Indice pouzzolanique Brightness photovolt blue filter / Blancheur photovolt filtre bleu Specific area (BET) / Surface spécifique (BET)
Water demand (Marsh cone) / Demande en eau (Cône de Marsh) Specific gravity / Masse spécifique
Bulk density / Densité apparente
Loose / Non tassé Tamped / Tassé
SIEVE ANALYSIS
Distribution granulométrique – Inférieur à 2 μm : 55%
1400 mg Ca(OH)2/g 74 %
19 m2/g
1650 g/kg
2,2 g/cm3
250 kg/m3 400 kg/m3

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Post by smarty on Jun 5, 2014 23:36:22 GMT -8
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Post by Deleted on Jun 6, 2014 0:14:35 GMT -8
I will go the cheap route with a fat white clay with high kaolinite content,
no iron, and mix it with 10% calcium oxide or Prompt.
BTW BASF sells highly reactive metakaolin as MetaMax.
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Post by photoman290 on Jun 6, 2014 3:20:03 GMT -8
just had an intersting chat to someone at laurence industries who are the uk inporters of metamax. she is sending me details of the product and a price. they will send a sample for us to experiment on.
smarty if you can send me a pm with your email i will forward you the info. i am away for the next few weeks so if you get a sample we can see how it performs. i asked for 5 kg which they are happy to send. we can also get it in 25kg bags. they are sending me a price for that later.
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Post by photoman290 on Jun 6, 2014 15:58:55 GMT -8
karl,
what is the best way to use metamax, as an additive to molochite before adding the activator? it is quite expensive so would would be unpractical to use on its own. seems it is added to cement in small amounts, so i assume it would be the same for geopolymer as well.
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Post by smarty on Jun 7, 2014 0:18:25 GMT -8
From what I've been reading the ratio of 2:1 silica is good for our purposes. So I'm guessing that since the pure Metakaolin is about 1:1 you could mix 1 part Diatomaceous earth in as well as 1 part molochite and -if my maths is right you get a ratio of 2:1 silica to alumina precursor. This makes a poly (silate-siloxo) which I believe is better for our purposes from what I've been reading - admittedly without a great deal of comprehension. Does this sound right Karl?
A couple of leads with other materials. Amazon sell Fly-ash, and pulverised blast furnace slag in 25kg bags. I can't find anywhere local that does. Multi-mite powder is Diatomaceous earth sold through oaktreepoultry.com
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Post by Deleted on Jun 7, 2014 2:40:38 GMT -8
karl, what is the best way to use metamax, as an additive to molochite before adding the activator? You have to see the reactive metakaolin and the activator as a kind of cement and the molochite grog as a filler. The ratio would be similar to the ratio of normal cement and sand. |
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Post by Deleted on Jun 7, 2014 2:59:15 GMT -8
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Post by photoman290 on Jun 9, 2014 13:23:10 GMT -8
after a bit more reading it seems potassium silicate is a better and safer option than sodium silicate as an activator. trouble is i cant find any apart from as a plant food at 34% is it feasible to reduce this by evaporating it ? or can use another form of potassium and make silicate from that instead. no one seems to stock it s far as i can tell from a quick look.
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