![]() ![]() We are also not responsible for any deliverable/unclaimed/lost/stolen packages. In addition, We are not responsible for any duty/import taxes/customs charges you may incur. Typically shipments arrive within 7-10 days but please allow up to 30 days at times depending on the custom situation with your country. Unfortunately since we have no control over the customs, we can't guarantee the delivery date. KOKOIST USA is not liable for any products lost or stolen. All fees imposed during or after shipping are the responsibility of the customer (tariffs, taxes, etc.). KOKOIST USA is not responsible for any customs and taxes applied to your order. The tracking number will be active within 24 hours. You will receive a Shipment Confirmation email once your order has shipped containing your tracking number(s). KOKOIST USA ships to addresses within the U.S., U.S. Shipping charges for your order will be calculated and displayed at checkout. If there will be a significant delay in shipment of your order, we will contact you via email or telephone. ![]() Please allow additional days in transit for delivery. ![]() *If we are experiencing a high volume of orders, shipments may be delayed by a few days. Orders are not shipped or delivered on weekends or holidays. Shipment processing time: All orders are processed within 2-3 business days. It can also be used to learn about plate tectonics and the movement of continents over time.Ī similar orientation of tiny magnetite grains occurs in the settling of sediment particles, locking clues to Earth's magnetic history into some sedimentary rocks.Thank you for visiting and shopping at KOKOIST USA.įollowing are the terms and conditions that constitute our Shipping Policy. This information is available for multiple locations on multiple continents. Today, geologists can study the magnetic properties of rocks of various age and reconstruct the history of change in Earth's magnetic field. This preserves the orientation of Earth's magnetic field within the rock at the moment of crystallization. In the crystallization of an igneous rock, tiny crystals of magnetite form in the melt, and because they are magnetic, they orient themselves with the direction and polarity of Earth's magnetic field. Tiny crystals of magnetite are present in many rocks. Small amounts of magnetite are also used as a toner in electrophotography, as a micronutrient in fertilizers, as a pigment in paints, and as an aggregate in high-density concrete. In the past few decades, synthetic abrasives have filled many of the applications where magnetite was previously used. Some finely ground magnetite is also used as an abrasive in waterjet cutting. The production of synthetic emery gives the manufacturer control over the particle size and the relative abundance of aluminum oxide and magnetite in the product. Some synthetic emery is produced by mixing magnetite with aluminum oxide particles. The abrasive known as "emery" is a natural mixture of magnetite and corundum. They can be directly loaded into a blast furnace at a mill and be used to produce iron or steel. These pellets are easy to handle and transport by ship, rail, or truck. The concentrate is then mixed with small amounts of limestone and clay, then rolled into small round pellets. Today's commercial taconites contain 25 to 30% iron by weight.Īt the mine site, the taconite ore is ground to a fine powder, and strong magnets are used to separate magnetically susceptible particles containing magnetite and hematite from the chert. Once considered a waste material, taconite became an important ore after higher grade deposits were depleted. Most of the iron ore mined today is a banded sedimentary rock known as taconite that contains a mixture of magnetite, hematite, and chert. Creative Commons photo by Harvey Henkelmann. The pellets are approximately 10 millimeters in diameter. Taconite pellets: These red spheres are taconite pellets that are ready to ship to a steel mill. ![]()
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