1. Temperature: The most important condition for the storage quality of tubers. According to the storage experience of the specialized breeding households, the difference between the temperature in the potato stack and the ambient air temperature is about 1.8 times the height of the potato stack. It is generally required that the height of the stack is not more than 2 meters, and the height l/2 height is generally most suitable. Timely adjustment of heap temperature is the key to storage. The initial temperature during storage is maintained at 15~20°C. After the wound is healed, the temperature in the pit should be reduced to a suitable temperature. It is appropriate to keep the temperature at 2~3°C throughout the storage period. During this period, air circulation should be strengthened to prevent overheating of the potato stack. Before and after the beginning of spring, the tubers are in a deep dormant state, breathing weakly and releasing less calories, so this period should prevent the outside cold air from entering the pit and avoid frozen tubers. After the spring begins, the temperature rises rapidly. It is necessary to prevent the entrance of hot air from the outside to prevent sprouting of tubers and to reduce the value of food and planting.
2. Humidity: The seed potatoes that have just been harvested have high humidity, and the amount of water vapor inside the pile is high. In the initial stage, under conditions of high temperature and high humidity, it is necessary to strengthen air convection in order to reduce the temperature and humidity inside the potato heap. However, when entering the severe winter season, the cellar temperature gradually decreased, and the cellar door should be completely closed. It is best to cover the potato stack with a certain thickness of grass or other straw, so that the tubers at the top of the tuber are warm, so that the humidity is too high to cause rot, and the cover can also accept the frost water that melts in the pit. Humidity is 80%~90% most suitable during storage.
3. Concentrations of O2 and CO2: At the early stage of tuber storage, there is more oxygen demand and more CO2 is emitted. Therefore, better ventilation conditions should be created so as not to cause hypoxia and CO2 accumulation. However, if the ventilation is poor, it will cause the choke tissue to suffocate and produce "black heart"; excessive CO2 will cause the germination rate to decrease.
Graphite can be divided into natural graphite and Artificial Graphite, which as the name suggests is made of artificial graphite. Graphite is an allotrope of elemental carbon. The existence of carbon is varied, with crystalline elemental carbon such as diamond, graphite; with amorphous carbon such as coal; complex organic compounds such as animals and plants; carbonate such as marble and so on. Because graphite has many excellent properties, it has been widely used in metallurgy, machinery, monocrystalline polycrystalline solar, electrical, chemical, textile, mold, electronic semiconductor, defense, aviation, aerospace, medical, sports, automotive and other industrial sectors.
In the metallurgical industry, natural flake graphite can be used to produce refractory materials such as magnesia carbon bricks and aluminum carbon bricks because of its good oxidation resistance. Artificial graphite can be used as a steelmaking electrode, and electrodes made of natural graphite are difficult to use in the more demanding steelmaking electric furnaces.
In the mechanical industry, graphite materials are commonly used as wear and lubrication materials. Natural flake graphite lubricity is better, commonly used as lubricant additives. Corrosive medium transport equipment, extensive use of artificial graphite piston rings, seals and bearings, work without the need for lubricating oil. Natural graphite and polymer resin composite materials can also be used in these areas, but wear resistance as artificial graphite.
In the chemical industry, artificial graphite has the characteristics of corrosion resistance, good thermal conductivity and low permeability. In the chemical industry is widely used in the production of heat exchangers, reaction tanks, absorption towers, filters and other equipment. Natural graphite and polymer resin composite materials can also be used in these areas, but the thermal conductivity, corrosion resistance as artificial graphite.
Artificial Graphite
Artificial Graphite,Synthetic Graphite,Carbon Graphite
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