Active ingredient refers to the major fertilizer nutrients in fertilizers can be absorbed by crops used, the weight percent of the element to be expressed, such as nitrogen% of nitrogen, phosphorus pentoxide% phosphorus and potassium hydroxide to % said nitrogen fertilizer - represents potassium% - phosphorus pentoxide. In addition to the main nutrients, other components contained in the fertilizer are called sub-components, such as ammonium sulfate containing 20 % to 21 % of nitrogen. For the purpose of applying nitrogen fertilizer, sulfate is a by-component; the active ingredient of superphosphate is phosphoric acid. The hydrate of calcium dihydrogenate Ca ( H 2 PO 4 ) 2 · H 2 O and a small amount of free phosphoric acid, and the accessory component is anhydrous calcium sulfate.
Precision Grinding And Polishing Machine
Ultra-precision cutting Ultra-precision cutting refers to the cutting method whose surface roughness is less than Ra0.04μm. The key problem in ultra-precision machining is that the thin surface layer of 0.1μm is cut in the final step. This requires both an extremely sharp tool with a radius of the blunt circle of the tool at the nanoscale and a tool with enough durability to keep it sharp. At present, only diamond tools can meet the requirements. In ultra-precision cutting, the cutting speed should be very high and the cutting amount should be small to ensure that the residual area on the workpiece surface is small, so as to obtain minimal surface roughness
Precision Grinding And Polishing Machine,Hi Tech Lap Grinder,Grinding And Buffing Machine,Diamond Grinding And Polishing Machine
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