The domestic nickel inventories at major ports in April decreased by 1.28 million tons to 19.3 million tons, and the overall decline was lower than that in March. Among them, Indonesia's nickel ore decreased by 162 million tons to 13.48 million tons from 15.1 million tons at the end of March, and the Philippine nickel ore increased by 340,000 tons to 5.82 million tons from 5.48 million tons at the end of March. With the increase in imports, the inventory of nickel in the Philippines in domestic ports increased more significantly in late April. The ports where nickel inventories decreased in April were Tianjin Port and Lianyungang, which were reduced by 500,000 tons and 450,000 tons respectively.
At present, the domestic nickel ore stocks mainly include stockpiles of nickel stockpiles at the port and stocks held by downstream nickel pig iron manufacturers, and the two have overlapping parts. For nickel nickel ore stockpiles available to domestic nickel pig iron manufacturers, we think the following two points are worth noting:
First, the domestic inventories of lateritic nickel ore are still relatively large, but the high-nickel ore stock concentration is relatively high, and a large number of high-nickel ore is held centrally by a few large-scale nickel pig iron manufacturers or nickel pig iron-stainless steel integration companies. Most of the large-scale nickel pig iron raw material stocks are sufficient for use for 4-5 months, and some are even enough for one year or so. The inventory of small and medium-sized nickel pig iron manufacturers is relatively small, and many manufacturers' raw material stocks can only be maintained for one or two months.
2. Nickel deposits from the Philippines will gradually increase. It is expected that a large number of low-nickel high-iron ore mines in the Philippines will be imported into the country in the coming year. These low-grade nickel mines are more suitable for the smelting of low-grade nickel pig iron. A considerable part is considered as Iron ore to use. In addition, it is expected that China will import up to 15 million tons of medium and high grade nickel ore from the Philippines for the rest of the year. Due to the tight supply of nickel ore and the rising nickel price of the LME benchmark, this year, the price of high-grade nickel ore in the Philippines has risen sharply. This means that the raw material acquisition costs of nickel pig iron manufacturers will increase significantly.
Meniscus Cylinder Lens
Meniscus cylinder Lens can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus cylinder Lens is used to increase the focal length of another Cylindrical Lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the cylindrical lens.
Some styles of cylindrical lenses have antireflective coatings to increase the transmission of light through the lens.
Fused silica cylinder lenses are ideal for demanding laser machining and medical applications.
Negative Meniscus cylinder lens
Positive Meniscus cylinder Lens
Specification of our meniscus cylinder lens or Plano-Convex Cylindrical Lens as follow:
*Material: BK7,Ge,UV-grade fuse silica(JGS1,JGS2,JGS3)or other optical materials
*Dimension Tolerance: +0.0 -- -0.1mm
*Center Thickness: +/-0.1mm
*Focal Length Tolerance: +/-1%
*Surface Quality:20/10
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture>90%
*Chamfer: 0.25mm at 45 degree typical
*Coating Optional
Meniscus Cylinder Lens,Optical Glass Meniscus Cylinder Lens,Meniscus Spheric Lens,Meniscus Cylindrical Lens
China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com