Quick,safe,very happy with specimens. Will do business again. Thanks.
Revert :
Your feedback is very important to us. Thank you very much.
If you do not mind ,I would like to address your responses further as follows:
1. Our XRD pattern data indicates that your tourmaline sample appears comprising of DARVITE and/or SCHORL tourmaline with the peripheral matrix of lepidolite mica and quartz, including also minor components of muscovite and albite .Could you tell us where your tourmaline source is? Yunnan mine in China? We are curious why is the silica /alumina ratio of the 2500 mesh tourmaline quite different from other 450 and 800 mesh tourmaline powders listed on your web site? Who is handling the milling process for your tourmaline powder products?
2. Where is a port near Shenzhen for exporting to U.S.A.?
3. Your measurement of FIR emittance is direct or indirect? FIR emittance of tourmaline is very important for the performance of the food process and we would appreciate your suggestions for tourmaline or other minerals with higher FIR radiance.
4. Only concern about heavy metals of your tourmaline sample is relatively high level of lead (Pb) around 32 ppm (will fax to you) via ICAP. Is there any way to reduce Pb in tourmaline?
5. The data of 36.72% SiO2 you mentioned might be the total SiO2 of tourmaline. As you know, the majority of SiO2 in tourmaline is the silicate with tetrahedral structures that is not of our concern but an impurity of free crystalline silica (AKA quartz) is strictly limited for a food process in U.S. As indicated in our XRD pattern data (will fax to you), the major pattern of free silica at two theta=26.65 degree is unfortunately overlapped with lepidolite mica and dravite tourmaline peaks of your tourmaline sample. Therefore it is rather difficult to quantify the amount of free silica in your tourmaline sample via XRD.
Revert :
1. Yes, our 2500 mesh tourmaline powder source is in Yunnan indeed. Moreover all of our tourmaline is brown TRAVITE tourmaline, which doesnt contain any SCHORL tourmaline (but its not excluded that a little bit SCHORL tourmaline is interfused in milling process). Of cause this tourmaline powder is made by our company and 450 and 800mesh tourmaline powders are milled with SCHORL tourmaline, whose mineral is from the mid of China, so they both are quite different.
2. Shenzhen has the biggest port to USA in China-Yantian port. Our extreme majority of products are shipped to all over the world through this port.
3. FIR radiance of our tourmaline powder is tested with testing device made in Japan and by ion emitting indirectly. Yes, understand you need fine FIR remittance of our tourmaline powder during food process, however, we need to re-adjust the raw materials and other additional materials of our tourmaline powder, it really needs time and cost.
4. Reducing the high level of lead(Pb) in our tourmaline powder is ambivalent with increasing FIR radiance of tourmaline, usually FIR radiance is related with the amount of zinc oxide in tourmaline powder, but our demiurge asked them both to live together like sisters. In this case, it is really an important and new problem for us how to balance their relationship.
5. Theoretically the SiO2 ratio in tourmaline should be in 35% ~ 42%, this is the best one. For the free crystalline silica you said, it may be caused by the quartz adulterated in tourmaline. Very unfortunately, any tourmaline contains a little quartz unavoidably, no matter how to filtrate and to eliminate. Certainly we can filtrate it carefully and responsibly before milling process, and try to reduce the impurity of quartz.
No Schorl in 2500 mesh tourmaline powder. It might be liked with mica (lepidolite or other mica), instead of tourmaline, right? By the way, which one of dravite or schorl emits generally higher FIR radiance over the wavelength of 5-20 microns?
Revert :
Our DRAVITE tourmaline really lives together with mica (Lepidolite and other micas) &quartz, there appears a overlap on your XRD pattern, which also proves it, that is to say, the peak in the XRD proves that the tourmaline we offered is indeed DRAVITE tourmaline .As for other several overlapped x-rays you marked with L&Q shows that our DRAVITE tourmaline should be higher than the one of SCHORL tourmaline.
We are still interested in your product of the tourmaline powder 2500 mesh. Since our application is related to an agricultural food processing, we hope to know about the nature of your product. Can you tell me your product specification, including tourmaline appellation %, FIR Radiance, max, allowable heavy metals (such as Ca, Pd, Hg, etc.) and free silica (quartz)?
Revert :
You can also know about its 4 aspects of structure, technology, safety and environmental protection form the enclosed testing reports by Chinese Authority Department. Its radiance of FIRthe wavelength is 225m:90%; it contains no Cd, Pd, Hg, etc, but only contains microelements beneficial to human body, such as chrome, manganese, titanium and cesium, etc. It contains 36.72% of free silica (quartz).
What are the major differences of 800 & 2500meshes tourmaline powders beside PSD?
Revert :
The main differences are Granule sizes, Amount of generating negative ions, Radiance of far infrared ray.
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