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Hi All,Since I have just gotten into abrasive blasting the subject of dust management has been an important consideration for my HF Bench Top Blast Cabinet mod.https://weldingweb.com/vbb/showthread.ph...-and-questionsI also found tons of contradicting info floating around on the web specifically related to glass dust.In a nutshell glass dust is "Amorphous Silica Dioxide" which is safe, while sand (or rock) dust is "Chrystaline Silica Dioxide" and dangerous. OSHA defines glass dust as a "nuisance dust" and generally benign. Of course no dust of whatever sort is good to breathe but based on what I researched I am not going to worry about exposure especially since my dust collection system woks so well.Here is where I got my information from:http://terrazzco.com/osha-silica-rule-glass-dust/https://www.fireapparatusmagazine.co...n-a-cloud.html
Reply:Keep believing that.BTW, kindly post a selfie with the blood dripping from your nose when you've breathed enough of that crap.PS, if you're near one of the bottle recycling plants you can probably get all of it you want free, just for sweeping it up and carrying it off.
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Originally Posted by Virgil5
Keep believing that.BTW, kindly post a selfie with the blood dripping from your nose when you've breathed enough of that crap.PS, if you're near one of the bottle recycling plants you can probably get all of it you want free, just for sweeping it up and carrying it off.
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Originally Posted by 12V71
Last time I looked, glass was made from Silica sand? Would not crushed glass dust be silica sand?
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Originally Posted by Virgil5
Once the sand is melted & combined with lime and other ingredients the silica hazard found in sand pretty much disappears. Refining silica back out of glass is about as possible as breaking down Freon 12 in the upper atmosphere.Glass dust presents an entirely different hazard. Every damn particle is a collection of mini razor blades.
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Originally Posted by Ullihundi
I listed a couple of what I believe to be accurate sources and you reply with what seems logical but with no backup. Don't get me wrong, I am not trying to convince anyone that it is ok to breathe glass dust, but rather than repeating what has been told and re told time and time again like an old wives tale I am trying to get to the bottom of this. Folks work in cement manufacturing and production plants, they work in massive rock quarries where there is always dust flying around. We breathe enough silica dust on dirt roads throughout our lives. All of this stuff is microscopically jagged. How is glass dust any more jagged and dangerous?
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Originally Posted by Virgil5
2 ways to find out; Buy a magnifying glass and look at the particle or breathe it and watch the blood drip out of your nose.If you elect to go with the breathe and bleed option, please take and post pictures. Your results may vary, you may be superman, although I have my doubts.
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Reply:As a kid I did some welding on a glass crusher at a recycling plant in St. Louis. Piles, and piles, of glass. Separate piles for different colors too. They didn't grind it, just crushed it from bottles and plates to particles about the size of an exploded tempered back glass in a automobile. These piles were then loaded into rail cars which were covered before departing. Don't know where the material went for secondary processing. Train cars, (hopper types) were loaded with a belt convey with two large end loaders loading the conveyor hopper at the same time. Don't remember it being dusty but sure was noisy.SlobPurveyor of intimate unparalleled knowledge of nothing about everything.Oh yeah, also an unabashed internet "Troll" too.....
Reply:I sure hope no one on this forum is snorting or smoking glass, that sh!t will really Fu@k up your head.
Reply:2 ways to crush glass for recycling. 1 is a hammermill design that creates a lot of fines. Fines are great for media blasting if you have processing. Processing means washing and sifting to get rid of labels. Fines are also good for making products like concrete counter tops and other things I don't know of. 2nd way of crushing glass for recycling is a spiked roller crusher similar to the crushers used on coal and limestone. That doesn't create many fines. Back when everybody went environuts in the 80s, recycling got big, and bankers threw money at people with business plans to recycle bottles. First generation plants were clusterfugis with all kinds of conveyor and wimmen sitting at computers next to the conveyor to enter the bottle owner's ID for payment. Made good coin building 3 of those plants. You can make money using air tools the conveyor manufacturer never thought of till the manufacturer learns what you're doing and puts his own erection crew together. Such is life.You make more money revising the plant because the management has no idea the blower that moves empty cans from dump hopper to bailer needs to be balanced. Of course they only called us after they broke the 3rd replacement motor free from its mounting flange. Made more money on the cogeneration system till Diesel went above 87¢ a gallon. Whole lot of waste of labor in recycling empty containers. Lot of fun too like when a genius decides to pile bales of cardboard and put trusses across the top. We refused the truss job so they brought in a cheap weldunce contractor. Guess what? Bales of compressed cardboard so burn. They also pizz off firemen who have to pull them apart and drown them. Just to make Slob happy, the contractor running 40 yard containers in used Macks. Guy hauling off bales of metal, cardboard & glass was all Peterbilt. Glass went to a bottle plant for remelt for colored glass bottles.The heavy money in the operation was in selling the plant to a new owner who knew less than the first owner.
Reply:I have my doubts about any government agency when it comes to safety...do you all remember the EPA stating the air around ground zero in NYC after the towers came down is safe to breath???In a series of public statements issued after the terrorist attacks of September 11, 2001, the Environmental Protection Agency (EPA) assured the people of New York that the air around ground zero was safe to breathe. ... The EPA's proclamation of safe air was premature and, as it turned out, wrong.World Trade Center Rescue Workers Believed EPA, Ended Up Sick ...https://www.google.com/url?sa=t&rct=...sgILnI0yzYmtGb
Reply:Even if the glass dust was harmless, some of the things blasted give off some truly interesting particulates.
Reply:That glass plant where I was had unloading docks where a truck would back up to a pit with crusher jaws and an auger in the bottom which would take the glass to a washing vat to remove labels, glues, paint, etc before being processed into the piles described earlier. Everything about that plant was loud in operation but they'd have a steady stream of trucks in and out all day long. They even took laminated glass and were able to separate the glass from the plastic but I don't know how.It's all gone now replaced with a box store lumberyard and most of the former residential neighborhood is built up commercial; and empty as the base has left.SlobPurveyor of intimate unparalleled knowledge of nothing about everything.Oh yeah, also an unabashed internet "Troll" too.....
Reply:Plastic floats on water, glass sinks.Probably caustic in the first stage bath to remove labels & glue.Possibly closed down by tree huggers.
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Originally Posted by Hobbytime
I have my doubts about any government agency when it comes to safety...do you all remember the EPA stating the air around ground zero in NYC after the towers came down is safe to breath???In a series of public statements issued after the terrorist attacks of September 11, 2001, the Environmental Protection Agency (EPA) assured the people of New York that the air around ground zero was safe to breathe. ... The EPA's proclamation of safe air was premature and, as it turned out, wrong.World Trade Center Rescue Workers Believed EPA, Ended Up Sick ...https://www.google.com/url?sa=t&rct=...sgILnI0yzYmtGb
Reply:I have a plan. Let's build a room the size of a school bus and cut loose with "nuisance" material for 6 hours per day for 3 months.They can leave for one hour to get a "lunch at BK or Mcd or other " approved" fine food establishments. These will be "experts' from OSHA. One year later lets review everything and see the results. 50 govt idiots should be sufficient for a semi-accurate conclusion.Last edited by Bonzoo; 12-01-2018 at 07:03 PM.
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Originally Posted by Bonzoo
I have a plan. Let's build a room the size of a school bus and cut loose with "nuisance" martial for 6 hours per day for 3 months.They can leave for one hour to get a "lunch at BK or Mcd or other " approved" fine food establishments. These will be "experts' from OSHA. One year later lets review everything and see the results. 50 govt idiots should be sufficient for a semi-accurate conclusion.
Reply:Yeah. Like'''''''''''http://graphics.wsj.com/jeb-bush-family-tree/
Reply:Ok I'll get this post back on track.At work we use a large shop vac attached to the vent port of the blast cabinet.Besides keeping the air in the shop clean it also keeps the air INSIDE the cabinet clean meaningyou can actually see what you are blasting!Another side benefit is the negative pressure inside the cabinet created by the shop vac keeps theglass from leaking out of every tiny point that is not perfectly sealed.Glass abrasive on concrete is about equal to greased glass in coefficient of friction!
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Originally Posted by rexcormack
Ok I'll get this post back on track.At work we use a large shop vac attached to the vent port of the blast cabinet.Besides keeping the air in the shop clean it also keeps the air INSIDE the cabinet clean meaningyou can actually see what you are blasting!Another side benefit is the negative pressure inside the cabinet created by the shop vac keeps theglass from leaking out of every tiny point that is not perfectly sealed.Glass abrasive on concrete is about equal to greased glass in coefficient of friction!
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Originally Posted by docwelder
are you saying the air around the wtc cleanup site wasn't safe?
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Originally Posted by William McCormick
There is carbon and metal dust in concrete that will kill you quick. Concrete manufactures denied carbon being in cement for years, finally they came out and admitted that there is carbon in cement. Carbon dust forms very nasty compounds in the lungs that damage the lungs. Sincerely, William McCormick
Reply:Pretty much any small dust will contaminate lungs.Rag shop workers called it brown lung.. Coal miners called it Black Lung.SSDD
Reply:Many sand basting operations will not blast with regular sand and choose black sand from crushed furnace slag. What I was told was that the black sand did not produce the silica dust and the particles were more sharp doing a better job. It certainly produces less dust in the air around the operation. Another choice for blasting media is steel shot.
Originally Posted by lotechman
Many sand basting operations will not blast with regular sand and choose black sand from crushed furnace slag. What I was told was that the black sand did not produce the silica dust and the particles were more sharp doing a better job. It certainly produces less dust in the air around the operation. Another choice for blasting media is steel shot.
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Originally Posted by CAVEMANN
The town where I live had a plant that made the blast media from the slag from the copper smelter, the slag is mostly iron, but silica is used in "fluxing" the furnace, the slag also contains arsenic, some lead, molybdenum, and lord knows what else. It was marketed as BLACK BEAUTY.
Reply:Harsco formerly Reed Minerals who produced millions of tons of blasting media from scrap slag.Dam fine blasting materials produced by a quality company. The individual components of the slag really aren't relevent since they are compounded into the ceramic slag and not readily seperable in blasting conditions.Only drawback to Black Beauty is it shatters on impact and isn't very usable in a recycled media operation.
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Originally Posted by Virgil5
Only drawback to Black Beauty is it shatters on impact and isn't very usable in a recycled media operation.
Reply:Guy I use for paint and rust removal around here uses a soft river sand imported from Missouri. It does really well stripping truck bodies and eating rust out without warping the steel. Small parts I do myself of course but depainting automotive sheet metal is more cost advantageous to sublet. He tried "Black Beauty" when it first started showing up to replace silica sand but it just didn't work as well as the river sand. They blast 7-8 hours a day non stop as that's their business.SlobPurveyor of intimate unparalleled knowledge of nothing about everything.Oh yeah, also an unabashed internet "Troll" too.....
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Originally Posted by Slob
Guy I use for paint and rust removal around here uses a soft river sand imported from Missouri. It does really well stripping truck bodies and eating rust out without warping the steel. Small parts I do myself of course but depainting automotive sheet metal is more cost advantageous to sublet. He tried "Black Beauty" when it first started showing up to replace silica sand but it just didn't work as well as the river sand. They blast 7-8 hours a day non stop as that's their business.
Reply:Just link to Reed's site http://www.blackbeautyabrasives.com/...-abrasives.php where you can learn plenty about slag material.You can also click on products and learn about Black Beauty crushed glass. There's even a nice picture of crushed glass showing the multiple cutting surfaces on each granule.Norton seems have taken a liking to making minimovies for the illiterate set to watch on devices.There is already 3 boxcars of information on hurling small chunks of rock and corncob, walnut shell, rice hulls, wheat hulls and Dry Ice along with soda at objects with compressed air, to say nothing of water under pressure, and it always boils down to my cousin Bill lives in a house that backs up to a house where the guy blasts crap in a tin box from China and Bill says it works good.What you ain't gonna find is a solitary solid definition of what the hell white metal condition is, and how long it has to remain in that condition sitting next to a swamp in Louisiana till somebody squirts a rattle can of Krylon at it.You also won't find a lick on off label misuse of Phosphoric Acid containing Polymeric temporary coatings as a base coat/adhesion layer, and why it's a pathetic substitute for proper coating.What the hell do I know? I only been at it for over 50 years.
Reply:Just about anything going in your lungs can kill ya. Other than clean air.Worst sinus/lung infection I ever got was from planting one year. Mold spores in the dust.
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Originally Posted by ronsii
Great name!!!! seem to recall some drugs in the 70's-80's with similar names that were to die for...
Reply:I visited the black beauty sit & found nothing of the origins of the media, the plant here in Ajo shut down a little over a year ago and moved the old Clarkdale smelter slag heap, that one should be even dirtier since that smelter shut down in the late 40's/ early 50's and never had any controls. Maybe the crushed slag was being used for their roofing product. There was one company that tried using it in leach fields and had to redo more than a few because they didn't work properly.IMPEACH BIDEN!NRA LIFE MEMBERUNITWELD 175 AMP 3 IN1 DCMIDSTATES 300 AMP AC MACHINEGOD HELP AMERICA!Freedom is never more than one generation away from extinction.We didnt pass it to our children in the bloodstream".RONALD REAGAN
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Originally Posted by Virgil5
There's even a nice picture of crushed glass showing the multiple cutting surfaces on each granule.Norton seems have taken a liking to making minimovies for the illiterate set to watch on devices. |
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发表于 2021-9-1 23:18:11