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blackmountain
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Join Date: Sep 2007
Posts: 5

Solar Grade Silicon from biogenic, reduction in induction furnace

12/23/2007 4:28 AM

Carbo reduction of Sio2 biogenic silica in an induction furnace

We are using 1700 C temperature flash for 6 sec/ pls indicate your experience of carbon to silica mix to obtain silicon of Solar Grade. Our micro furnace is made of a star of 24 quartz and nitride tubes, purged with helium, we use cartridges of silica 99,99% wrapped in purest graphite ( nuclear power station ) or pvc synthetic carbons
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binder428
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Join Date: Dec 2007
Posts: 11
#1

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 9:13 AM

Sounds interesting.

How much sample can you process at a time?

Michael Binder

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blackmountain
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Join Date: Sep 2007
Posts: 5
#5
In reply to #1

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 6:29 PM

Hello Michael

we are processing about 50 grams of Sio2 at a time, they are packed into a Titanium, or Nickel, or Lantalim skin cartridge and pushe dinto a casting chamber very similar to a rifle chamber, it is made of quartz or nitride, ther we cast the cartridge with polythene grains. Our temp flash was very unprecise till now, we got cabronized amterilas and cristobalite crystals. We have a table with 48 different wight samples of this mix also use for isotopcvi research, the table pulls down the cartridegs and we repeat the casting effort to find the best arbon to silica mix. Any suggestions? Please wirte directly to Dr Italiano at pietroitaliano@costech.net thanks and Merry Christams
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RHABE
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Join Date: Dec 2006
Location: Germany 49° 26' N, 7° 46' O
Posts: 1950
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#11
In reply to #5

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 3:46 PM

Hi,

is this evacuated?

If not I estimate large amounts of air and water to be present that severely changes reaction kinetics and proportions needed from pure stochiometry.

I have no experience in this field of silicon but I am brazing diamonds to tool shafts and there as in many critical processes the oxygen and water content is very critical.

RHABE
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binder428
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Posts: 11
#2

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 9:18 AM

What sort of carbon blacks are you using?

My experience is that most have high Al concentrations.

Even 99.99% Silica has high Al content.

Michael Binder
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RHABE
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Location: Germany 49° 26' N, 7° 46' O
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#3

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 10:25 AM

Which purity is needed?

RHABE
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Anonymous Poster
#4
In reply to #3

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 10:30 AM

We are looking for solar grade silicon where B and P should be below 1ppm.

B is usually present in silica.

Michael Binder

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blackmountain
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Join Date: Sep 2007
Posts: 5
#7
In reply to #4

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 6:37 PM

Hello

we shall start construction of a new solar grade silicon casting in Italy, processing 99,9999% silica from refined, purified, leached, pulverized rice hulls. Theri B and P values are well below the limit you set, we certified them at european labs

We shall sell our So Grade Si at 40 Euros 1 kg, starting Otober 2008

Out put will be 100 metric tons per annum

NC
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binder428
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Join Date: Dec 2007
Posts: 11
#15
In reply to #7

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/29/2007 9:58 PM

Please send me additional information about your plant and process (if publically available)

Michael Binder Ph.D.

binder428@yahoo.com
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blackmountain
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Join Date: Sep 2007
Posts: 5
#6
In reply to #3

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/24/2007 6:34 PM

Hello

Sog Si purity is needed at 99,999% or 99,9999%

we are developing an automatic microfractional casting systems ( same as used in gold jewelry ) , istantaneous, the feedup is pneumatic, we want to avoid advanced arc furnaces, saving energy and having a better control of temperature, we can cast 120 kg in 2 hours, instead of 120 kg for 24 hours duty of an arc furnace.

We are researching at temperatures between 1.200 and 1.700 C with different silica to blacks blends, also our casting nut lodge is a problem titanium cracked after some casts, we try now nickel or lantalium

pls e mail dr Pietro Italiano our chief researcher

at pietroitaliano@costech.net

thanks

NC
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Anonymous Poster
#10
In reply to #6

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 3:19 PM

Your process sounds interesting.

Please feel free to send me additional information or a link to your website.

Michael Binder

binder428@yahoo.com

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binder428
Active Contributor

Join Date: Dec 2007
Posts: 11
#16
In reply to #6

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/29/2007 9:59 PM

I e-mailed him and did not receive a reply.

Michael Binder Ph.D.

binder428@yahoo.com
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sirmione571
Participant

Join Date: Aug 2011
Posts: 1
#17
In reply to #3

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

08/02/2011 5:27 PM

sorry for this very late contribution, we developed the followjng process, rice husks pyrilosis, at 505 C, flash, ashes are chemically leached and rectified, pulverized, oxydized and have a sotchiometry of 30/70 SiO2+C naturally bound, we seek now and study: 1 ) pelletization form and method 2 ) charge in advanced arc furnace or induction furnace continuous melt. Our cahrge hs 99,98% purity an boron under 0,1 ppm, we obtain purification with hot HCL washing in 3 to 5 phases ( 25% HCL ) i soxhlet similar reactors
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Anonymous Poster
#8

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 3:14 PM

1. I do not understand how one gets solar grade Si starting with 99.99% SiO2.

2. C/SiO2 ratios should be based on the stochiometry of the reaction:

SiO2 + 2C --> Si + 2CO

3. If C and SiO2 are in close contact, don't you get SiC?

Michael Binder

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Anonymous Poster
#9
In reply to #8

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 3:17 PM

Please feel free to contact me

binder428@yahoo.com

Michael Binder
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Anonymous Poster
#13
In reply to #9

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 4:21 PM

OK we sent you our particulars
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Anonymous Poster
#12
In reply to #8

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 4:17 PM

thanks for your offer. Our process is under IP secrecy protection but any contribution is welcome, therefore I passed your e mial onto Mr Pietro Italiano of www.costech.net

we obtain Silica from rice hulls ( and other biogenic sources ) , after pulverizing and pyrolizing + leaching them

What is you area of work?

regards

N Cerni, www.nico-cerni.com
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RHABE
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Location: Germany 49° 26' N, 7° 46' O
Posts: 1950
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#14
In reply to #8

Re: Solar Grade Silicon from biogenic, reduction in induction furnace

12/25/2007 4:49 PM

Hi MB,

you are right, but:

it is likely that excess water and oxygen is disturbing the reaction, maybe nitrogen ans CO2 too.

I experienced this in the totally different field of brazing diamond.

RHABE

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Anonymous Poster (6); binder428 (4); blackmountain (3); RHABE (3); sirmione571 (1)

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