Deleted
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Post by Deleted on Oct 11, 2014 18:26:08 GMT -5
Glenn.. Have you ever heard the term, "better stop while you're ahead"?.. Let it go.. you're trying way too hard to impress those here who have way more experience than you or I.. In this case, I would discontinue wasting the servers space with nonsense threads and move on.. Also, it would appear that you may have ignored several users.. becasue their comments and suggestions have gone unseen or unheard.
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Post by roy on Oct 11, 2014 19:32:42 GMT -5
interesting!
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Post by glennz01 on Oct 12, 2014 1:41:09 GMT -5
Glenn.. Have you ever heard the term, "better stop while you're ahead"?.. Let it go.. you're trying way too hard to impress those here who have way more experience than you or I.. In this case, I would discontinue wasting the servers space with nonsense threads and move on.. Also, it would appear that you may have ignored several users.. becasue their comments and suggestions have gone unseen or unheard. The only person i'm trying to impress is myself... there is a reason i have not responded to several posts in the past and i gave that reason a few posts back. If people don't want to view this thread they don't have to respond or look back at this thread, the people that want to follow can follow if they like. Once there was a person that had 25 computers roughly all broken and said to me that they could not be fixed.. I asked if i could try to fix them and he said "its useless but there will be no harm done so go ahead and do what you like) 4 weeks later i had 20/25 computers running and the other 5 i used as parts to fix the 20... That is how i got hooked into fixing computers where I am going to college to learn more. Enough said on that subject now. The specific gravity is 19600 Kg/M cubed so 4 tablespoons is probably around 1 or 2 lbs (not verified, but i can if requested) Here is a good website with data on it and here is some important excerpts from it relating to why it is good for tumbling among other features. link" Strength - Tungsten carbide has very high strength for a material so hard and rigid. Compressive strength is higher than virtually all melted and cast or forged metals and alloys. Rigidity - Tungsten carbide compositions range from two to three times as rigid as steel and four to six times as rigid as cast iron and brass. Young's Modulus is up to 94,800,000 psi. High resistance to deformation and deflection is very valuable in those many applications where a combination of minimum deflection and good ultimate strength merits first consideration. These include spindles for precision grinding and rolls for strip or sheet metal. Impact Resistant - For such a hard material with very high rigidity, the impact resistance is high. It is in the range of hardened tool steels of lower hardness and compressive strength. Wear-Resistance - Tungsten carbide wears up to 100 times longer than steel in conditions including abrasion, erosion and galling. Wear resistance of tungsten carbide is better than that of wear-resistance tool steels."
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Post by captbob on Oct 12, 2014 9:31:06 GMT -5
Anyone know the specific gravity here. Pretty dense I think. Jim The specific gravity is 19600 Kg/M cubed so 4 tablespoons is probably around 1 or 2 lbs (not verified, but i can if requested) Here is a good website with data on it and here is some important excerpts from it relating to why it is good for tumbling among other features. link" Strength - Tungsten carbide has very high strength for a material so hard and rigid. Compressive strength is higher than virtually all melted and cast or forged metals and alloys. Rigidity - Tungsten carbide compositions range from two to three times as rigid as steel and four to six times as rigid as cast iron and brass. Young's Modulus is up to 94,800,000 psi. High resistance to deformation and deflection is very valuable in those many applications where a combination of minimum deflection and good ultimate strength merits first consideration. These include spindles for precision grinding and rolls for strip or sheet metal. Impact Resistant - For such a hard material with very high rigidity, the impact resistance is high. It is in the range of hardened tool steels of lower hardness and compressive strength. Wear-Resistance - Tungsten carbide wears up to 100 times longer than steel in conditions including abrasion, erosion and galling. Wear resistance of tungsten carbide is better than that of wear-resistance tool steels." well there ya go!
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jamesp
Cave Dweller
Member since October 2012
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Post by jamesp on Oct 12, 2014 9:40:00 GMT -5
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Post by glennz01 on Oct 16, 2014 15:31:26 GMT -5
Going to start test with slag as grit on monday.
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Post by captbob on Oct 17, 2014 9:26:10 GMT -5
< /font = edge of seat >
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Deleted
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Post by Deleted on Oct 17, 2014 10:50:29 GMT -5
Now that's some funny $hit!!! Dave
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azgnoinc
spending too much on rocks
Member since March 2014
Posts: 484
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Post by azgnoinc on Oct 19, 2014 6:49:34 GMT -5
I'm interested to see how the slag works versus the tungsten carbide - or are you adding this in addition to it? captbob - lmao!!
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Post by glennz01 on Oct 19, 2014 20:29:25 GMT -5
I'm interested to see how the slag works versus the tungsten carbide - or are you adding this in addition to it? captbob - lmao!! Just using coal slag, nothing else... I will be using 4 tablespoons.. I'm really not sure how this will do on its own.. will be interesting.
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unclesoska
freely admits to licking rocks
All those jade boulders tossed in search of gold!
Member since February 2011
Posts: 934
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Post by unclesoska on Oct 19, 2014 21:08:18 GMT -5
Glen- Coal slag has a reputation for being highly toxic, even at low exposure or concentrations, mainly due to its Beryllium content. I mention this since I've not heard you speak to safety issues when using this material, and this being a public forum and all, I think others may appreciate a head's up when using hazardous materials. Oh, and the Moh's hardness of coal slag is in the 5 range, so unless you're tumbling something real soft, I would expect you to be wasting your time and endangering your health.
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azgnoinc
spending too much on rocks
Member since March 2014
Posts: 484
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Post by azgnoinc on Oct 19, 2014 22:21:24 GMT -5
Glen- Coal slag has a reputation for being highly toxic, even at low exposure or concentrations, mainly due to its Beryllium content. I mention this since I've not heard you speak to safety issues when using this material, and this being a public forum and all, I think others may appreciate a head's up when using hazardous materials. Oh, and the Moh's hardness of coal slag is in the 5 range, so unless you're tumbling something real soft, I would expect you to be wasting your time and endangering your health. Thanks for the heads up as I was not aware of it being potentially toxic let alone highly toxic.
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Post by glennz01 on Oct 19, 2014 22:47:51 GMT -5
Glen- Coal slag has a reputation for being highly toxic, even at low exposure or concentrations, mainly due to its Beryllium content. I mention this since I've not heard you speak to safety issues when using this material, and this being a public forum and all, I think others may appreciate a head's up when using hazardous materials. Oh, and the Moh's hardness of coal slag is in the 5 range, so unless you're tumbling something real soft, I would expect you to be wasting your time and endangering your health. Your thinking of a different byproduct probably fly ash also you are not breathing it in (which is as harmful as other things we cab) ... It doesn't have a great hardness which is why i mainly used it for an addative, anyway heres the info. From link 1 "Silicon Dioxide = 41-53%, Silicon Dioxide- Crystalline "Free Silica" Quartz= <0.1%, Aluminum oxide= 17-25%, Titanium dioxide= 0-2%, Iron Oxide (FeO)= 7-31%, Calcium oxide= 3-15%, Magnesium Oxide= 0-4%, Potassium Oxide= 0-3% and Sodium Oxide= 0.62%. Source= Harsco Minerals MSDS Mohs Hardness @20°C 6-7" From link 2 "Coal slag is an black, glass matrix alumina-silicate which is produced when wet bottom boiler power plants burn pulverized coal. The bottom ash is kept in a molten state until it is tapped and introduced to water. The water quenches the molten slag and instantly vitrifies it producing the raw glassy slag which Ensio Resources recycles through its processing facility to produce a variety of beneficial products for market. It has the optimal hardness, density, and particle shape to provide for an exceptional silica free blasting abrasive, roofing granule, non-skid, and sealcoating surface material. Coal slag is not to be confused with fly ash or other forms of coal combustion byproducts which have completely different physical and chemical characteristics. Coal slag is an inert material and environmentally safe. ERI coal slag products do not exhibit any hazardous waste characteristics and pass all tests concerning heavy metals analysis, TCLP testing, and is approved by the United States Navy for blasting at our nation’s major warship and submarine bases. Because Coal Slag is vitrified, the chemical attributes within the amorphous glass-like structure are encapsulated even when the granules are shattered at highspeeds during blasting. Because Coal slag products are recycled, their production don’t impact our environment like mined sources of competing products like garnet or sand. Coal Slag products are Low- Free Silica in nature and are THE safer alternative to silica sand and other crystalline silica-rich materials. Learn more: Silica-Free Explained" Link 1Link 2
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unclesoska
freely admits to licking rocks
All those jade boulders tossed in search of gold!
Member since February 2011
Posts: 934
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Post by unclesoska on Oct 19, 2014 23:01:51 GMT -5
In response to Public Citizen’s January request to disclose information about workers’ exposure to beryllium, six major coal slag manufacturers are updating their Material Safety Data Sheets (MSDS) and providing workers with more information about this toxic metal.
Coal slag is used to make roofing and flooring products as well as abrasives used to remove paint and rust. According to Public Citizen, those who work with coal slag abrasive are exposed to potentially dangerous levels of beryllium, which can result in chronic beryllium disease and lung cancer. Even short-term exposure at low levels can be dangerous, Public Citizen said.
“Workers have a right to know what could seriously harm them in the workplace,” said Keith Wrightson, worker safety and health advocate for Public Citizen’s Congress Watch division.
According to federal law, manufacturers are required to tell workers about a hazardous substance if a mixture they are working with contains the toxicant at levels that “could be released in concentrations which would exceed an established OSHA permissible exposure limit.”
Public Citizen discovered in January that coal slag manufacturers were failing to properly disclose the toxic contents of beryllium hazards on their MSDSs. As a result, Public Citizen sent a letter to Thomas Galassi, directorate of enforcement programs at OSHA, requesting that the current regulation be enforced.
Since Public Citizen’s letter, six of the eight major coal slag companies – Harsco Corp., Abrasives Inc., American Industrial Minerals, ATI Black Diamond, Mobile Abrasives Inc. and Opta Minerals Inc. – have updated and listed beryllium on their MSDSs.
Two major manufacturers of coal slag, Ensio Inc. and U.S. Minerals, have failed to comply, according to Public Citizen.
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unclesoska
freely admits to licking rocks
All those jade boulders tossed in search of gold!
Member since February 2011
Posts: 934
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Post by unclesoska on Oct 19, 2014 23:16:04 GMT -5
Oxford Journals Medicine & Health & Science & Mathematics Toxicological Sciences Volume 61, Issue 1 Pp. 135-143.
Comparative Pulmonary Toxicity of 6 Abrasive Blasting Agents
A. F. Hubbs*,1, N. S. Minhas*, W. Jones†, M. Greskevitch†, L. A. Battelli*, D. W. Porter*, W. T. Goldsmith*, D. Frazer*, D. P. Landsittel*, J. Y. C. Ma*, M. Barger*, K. Hill*, D. Schwegler-Berry*, V. A. Robinson* and V. Castranova*
+ Author Affiliations
*Health Effects Laboratory Division and †Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, 1095 Willowdale Road, Morgantown, West Virginia 26505
Received October 4, 2000. Accepted December 15, 2000.
Abstract
Inhalation of silica dust is associated with pulmonary fibrosis. Therefore, substitute abrasive materials have been suggested for use in abrasive blasting operations. To date, toxicological evaluation of most substitute abrasives has been incomplete. Therefore, the objective of this study was to compare the pulmonary toxicity of a set of substitute abrasives (garnet, staurolite, coal slag, specular hematite, and treated sand) to that of blasting sand. Rats were exposed to blasting sand or an abrasive substitute by intratracheal instillation and pulmonary responses to exposure were monitored 4 weeks postexposure. Pulmonary damage was monitored as lactate dehydrogenase (LDH) in the acellular lavage fluid. Pulmonary inflammation was evaluated from the yield of polymorphonuclear leukocytes (PMN) obtained by bronchoalveolar lavage. The activity of alveolar macrophages was determined by measuring zymosan-stimulated chemiluminescence. Blasting sand caused lung damage and showed histologic evidence for inflammation and fibrosis. Garnet, staurolite, and treated sand exhibited toxicity and inflammation that were similar to blasting sand, while coal slag caused greater pulmonary damage and inflammation than blasting sand. In contrast, specular hematite did not significantly elevate LDH or PMN levels and did not stimulate macrophage activity 4 weeks postexposure.
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unclesoska
freely admits to licking rocks
All those jade boulders tossed in search of gold!
Member since February 2011
Posts: 934
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Post by unclesoska on Oct 19, 2014 23:17:55 GMT -5
My apologies for pasting entire articles, I can't seem to figure out how to create a link here.
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Post by glennz01 on Oct 19, 2014 23:23:21 GMT -5
Well beryllium like other rocks / elements is mainly harmful if it is inhailed (not even eating pure beryllium is too toxic) It is used in dental bridges by the looks of it in an alloy.
That said used in water should be no problem just like any rock. (I'm sure lots of rocks we tumble contain harmful substances)
That info makes it seem like silica is more dangerous (agates)
I guess the main thing is not to breath any of it in... If you are going to use this as i shall experiment with just dispose of the slurry when you are done with it so you dont breath it in when it drys out.
Just because something contains hazardous materials doesn't mean they will be harmful to you if you use water (like agates, tiger eye, bumblebee jasper, among other things)
Iodine is probably a lot more toxic considering 1 drop if you ingest it is very bad.
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unclesoska
freely admits to licking rocks
All those jade boulders tossed in search of gold!
Member since February 2011
Posts: 934
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Post by unclesoska on Oct 19, 2014 23:33:44 GMT -5
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Post by glennz01 on Oct 19, 2014 23:40:32 GMT -5
Well i guess my new question is: is Beryl more toxic than coal slag? I'd think it is but i'd need to see numbers... ive got a piece i want to polish for display
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Post by glennz01 on Oct 21, 2014 0:04:48 GMT -5
always helps when i remember to bring the rock but not the material... well maybe tomarrow, thursday or friday i'll start the load
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