Mahenge spinel is a stunning gem that is found from the Mahenge region of Tanzania in East Africa. The stone has a rich, deep red color and is known for its exceptional clarity. Mahenge spinel is relatively rare, making it a sought-after gem by collectors. The stone is also durable, making it ideal for use in jewelry making
Variety : Spinel
Color : Violet
Weight : 1.17 Ct
Dimension : 6.50mm*5.25mm*4.30mm
Shape : Oval
Cut : Mixed Cut
Origin: Sri Lanka (Ceylon)
Clarity : FL - Flawless
Treatment : Not Enhanced
Reference No : 1269
Shipping : Free Registered Air Mail
Shipping Policy
After your payment has cleared, your item(s) will be shipped out within 1-3 working days.
Shipping Charges depend on each case and are clearly mentioned in the Ebay listings.
The following shipping options are available:
Registered Air Mail (Insured, Traceable) : Free (Takes 10-30 days)
EMS Express Mail (Insured, Traceable): 80 USD (Takes 8-20 days)
Import duties, taxes and charges are not included in the item price or shipping charges.
These charges are buyers responsibility and check your country's custom office to determine additional costs prior to buying.
Return Policy
Returns accepted within 30 days after receiving the item.
After receiving the item buyer should contact within 14 Days.
Full Refund will be given as money back.
Contact Information
If you have any questions, concerns or inquiries about this item or any other item listed on Ebay, please contact our support team through the Ebay messaging system. We answer all messages within 24 hours, usually earlier.
Summary
Spinel is a rare mineral in nature, and it must be made by artificial synthesis. According to a certain proportion of raw materials, mixing pressing ball molding (to join the right amount of pulp). The characteristics of electric furnace melting temperature, in the smelting process, to maintain the redox state, avoid Fe2O3 FeO oxidation, to prevent the emergence of elemental Fe, after natural cooling of the hercynite sand. The uniform large crystal (95%) with no grain boundary was revealed under the microscope, which was similar to that of the glassy state. After processing into the iron aluminum spinel brick, mainly used in large-scale cement rotary kiln, instead of the current cement kiln used chrome brick, no Cr6+ pollution. Extended lining service life (magnesia chrome brick 10-12 months and hercynite brick 17-18 months), greatly reducing the consumption of refractory material and manpower, reduces the production cost, the full realization of the cement kiln chrome free production, solve the chromium pollution. Fe Al spinel represents a new generation of high performance chrome free refractories for cement rotary kiln.
The two main methods for the synthesis of spinel are sintering and electric melting. Most spinel material is made from high purity synthetic alumina and chemical grade magnesium oxide, namely in shaft kiln sintering and fused in arc furnace.
Al Mg spinel is a kind of aluminum magnesium oxide, its main component is alumina and Magnesium Oxide. Al Mg spinel has two kinds of natural formation and artificial synthesis. Natural magnesia spinel rarely found industrial applications of magnesium aluminum spinel are all artificial synthesis, the two main methods of synthetic magnesia alumina spinel is sintering and electric melting method. etc.
Spinel application
Sintered magnesia alumina spinel is used for cement rotary kiln, which not only avoids chromium pollution, but also has good resistance to spalling. Sintered magnesia alumina spinel is used for making ladle pouring material, which can greatly improve the anti erosion ability of steel sheet lining. The preparation of high quality synthetic spinel provides a new raw material for the production of amorphous and amorphous high purity refractory materials.
Electric melting magnesium aluminum spinel is manufacturing plate, nozzle brick, open hearth brick material. The high temperature mechanical properties of aluminum and magnesium spinel products are good, which are the basic raw materials of the filter belt, refractory casting material and high. Fused magnesia alumina spinel used in iron and steel smelting and glass industry furnace.
