The effect of aluminum on human body is still inconclusive. In fact, no cases of aluminum disease have been found. People consume about 10- 18 mg of aluminum from their diet every day, most of which is excreted through the digestive tract with feces, and a small part is accumulated in testicles, kidneys, spleen, muscles, bones and brain tissues. It has always been thought that aluminum has little effect on human health. However, in patients with Alzheimer's disease or mental disorders, the aluminum content in the brain is 10-30 times higher than that in normal people. Further studies have confirmed that high aluminum content in food will lead to early aging. The accumulation of aluminum in the brain will lead to the degeneration of cranial nerves, memory decline, intelligence and personality will also be affected, and even Alzheimer's disease will occur. When the aluminum accumulation in the body exceeds 5- 16 times of the normal value, it can inhibit the absorption of phosphorus in the intestine and interfere with the normal metabolism of calcium and phosphorus in the body. Properties of Aluminum Aluminum is a silvery white metal with a melting point of 660.65438 0℃. The aluminum content in the crust is about 8%. Among all the elements, it ranks third after oxygen and silicon. The density of aluminum is very small, only 2.7 g/cm3, which is less than that of copper 1/3. Its electrical and thermal conductivity is good, second only to silver, gold and copper, ranking fourth. The conductivity of aluminum is only about 65% of that of copper. In conducting the same amount of current, the conductive cross-sectional area of aluminum is about 1.6 times that of copper, but the weight of aluminum is only 30% of that of copper, and the consumption of aluminum is still about half. Aluminum has active chemical properties, which easily combines with oxidation in air, forming a dense oxide film on the surface, isolating aluminum from oxygen, preventing aluminum from further oxidation, and becoming a good material for atmospheric corrosion resistance. Good plasticity, easy processing, can be rolled into thin plates and foils, drawn into extremely fine wires, and extruded into various profiles with complex sections. Good reflection performance, which can reflect both visible light and ultraviolet light; The radiation resistance of aluminum is second only to zirconium and beryllium. The use of aluminum The strength of pure aluminum is small, which can be improved after work hardening, but its plasticity is seriously reduced. If an appropriate amount of other elements are added to aluminum to prepare aluminum alloy, it has the characteristics of high strength, good plasticity and high specific strength, which can be compared with high-quality alloy steel and become an excellent light structural material, known as "flying metal". Aluminum accounts for more than 50% of the aircraft structure. Replacing part of steel with aluminum alloy can reduce the weight of motor vehicles by 20%-75%, reduce fuel consumption by 8% and prolong the life of mechanical parts by 15%. In the electrical appliance industry, using aluminum to make conductive materials such as cables and wires is more economical and widely used than using copper. Aluminum is used as pipeline for transporting liquid natural gas, refrigeration equipment and petroleum refining equipment in chemical industry. Aluminum used in vehicle and ship construction industry is developing rapidly. Aluminum is also widely used in the construction industry. Aluminum is also a good packaging material, reducing agent and deoxidizer. Lead-calcium alloy is superplastic and can be used to make special-shaped appliances and various handicrafts. 1825 Danish Oster made aluminum metal aluminum, and only a few milligrams were obtained for the first time. Later, many scientists did various experiments. They use metals more active than aluminum, such as potassium, sodium or magnesium, to reduce aluminum compounds and get aluminum. However, during this period, the preparation of aluminum was a chemical method. At that time, due to the high cost, it could not be mass-produced and applied. It is only used as valuables such as jewelry, and the abundant aluminum in the earth's crust has become precious metal. Until 1886, American Hall and French Elu obtained the patent of aluminum production by cryolite-alumina molten salt electrolysis almost at the same time, and electrolysis became the main method of aluminum production, which created favorable conditions for the development of aluminum industry. Toxicity analysis of aluminum: aluminum generally enters the human body through the use of food, drinking water, drugs and aluminum cookers, and stays in the brain, lungs, liver, bones and testicles. If the human body accumulates too much aluminum, it will do harm to brain tissue and intellectual development. In order to prevent aluminum poisoning, aluminum containers and cookers are generally coated with a layer of non-toxic paint, so that drinks or food do not directly contact aluminum. Also pay attention to not using or using less aluminum-containing initiators and fixatives to avoid taking aluminum-containing drugs for a long time, such as "Weishuping". Because a certain amount of alum (potassium aluminum alum) is added to the fritters, it is better to eat less. The natural toxicity of aluminum is very weak, and aluminum in food is easy to form insoluble precipitate with phosphoric acid compounds, which is not easy to be absorbed by human body; At the same time, the gastrointestinal tract of normal people has a barrier effect on aluminum, which can prevent excessive aluminum from entering the body. Therefore, as long as proper attention is paid, there is no need to worry too much about the toxicity of aluminum. Known as the "Central Plains", Henan Province is rich in mineral resources, with bauxite, molybdenum and gold as the main non-ferrous metal deposits. Among them, bauxite reserves rank among the top in China. The development of aluminum smelting industry in Henan Province is rich in bauxite, coal and electricity. Zhengzhou Aluminum Factory and Sanmenxia Aluminum Factory are important aluminum smelters in China. Zhongyuan has become one of the aluminum smelting bases of China nonferrous metal industry. In the coal sea, Shanxi province has the richest aluminum mine coal reserves, ranking first in the country, and is known as the "coal sea". There are also rich non-ferrous metal mineral resources in the "coal sea". The copper mine in Zhongtiaoshan has long been famous, and the bauxite in Xiaoyi and other places is also very considerable. Industrial reserve, where Xiaoyi aluminum mine has been proved, can be used by 654.38 million tons alumina plant for more than 654.38 million years. Such a large-scale aluminum mine is rare in China. Shanxi is also one of the provinces rich in bauxite, electric power and coal resources, and has unique conditions for developing aluminum smelting industry. Shanxi Aluminum Factory under construction is one of the aluminum industrial bases in China. Guinea is one of the countries with the largest bauxite reserves, located in Guinea in western Africa. Although the land area is small, it is one of the countries with the largest bauxite reserves in the world. Guinea's bauxite reserves are about 6 billion tons, mainly distributed in Fengtai FoutaDjallon Plateau, and the main producing areas are Fria, Bok, Kindia and Luosi Island. The mining industry is dominated by local aluminum mines and iron mines. Local aluminum mines rank first in Africa, and alumina exports account for a large proportion in foreign trade. Fengtai FoutaDjallon Plateau is rich in hydraulic resources, which have been developed, and the electricity needed for aluminum smelting will be provided by hydropower. Jamaica's native aluminum mineral resources rank third in the world. Jamaica is located in the northwest of the Caribbean Sea, about 0/40 km north of Cuba. It is an island country with a length of 130 kilometers from east to west and a width of 82 kilometers from north to south. Although the land area is small, bauxite reserves are very rich, estimated at 500-600 million tons. Mainly distributed in the central part of Jamaica Island. 1993 bauxite output1170,000 tons, ranking third in the world. Aluminum smelting is also quite large, and more than a quarter of bauxite production is processed into alumina. Export bauxite and alumina. Foreign exchange income of bauxite and alumina ranks first in China. Trade targets are the United States, Britain and Canada. Guyana is one of the exporters of bauxite, located in the eastern part of South America, bordering on the Atlantic Ocean. The mineral resources here are very rich, among which bauxite is the most important, with a reserve of 360 million tons, ranking among the best in the world. The main mining centers are Linden, Kwakwani and other areas in the northeast. Bauxite in Guyana contains high alumina and few impurities. Bauxite production plays an important role in the country's economy. Bauxite, sugarcane and timber are the "three pillars" of Guyana's economy. The annual output of 1993 bauxite exceeds1650,000 tons, which is one of the major bauxite producers in the world and one of the famous bauxite exporters. The main trade targets are the United States, Britain, Canada and other countries. Georgetown, the capital, is the largest seaport in China, mainly exporting bauxite. Aluminum ingot aluminum, our daily industrial raw material is called aluminum ingot. According to the national standard (GB/T 1 196-93), it should be called "aluminum ingot for remelting", but everyone is used to calling it "aluminum ingot". It is produced by electrolysis with alumina-cryolite. There are two kinds of aluminum ingots after entering industrial application: cast aluminum alloy and forged aluminum alloy. Casting aluminum and aluminum alloy are aluminum castings produced by casting method; Deformed aluminum and aluminum alloys are processed products that produce aluminum through pressure processing: plates, strips, foils, pipes, bars, molds, wires and forgings. Follow? Aluminum ingot for remelting? According to the national standard, "aluminum ingots for remelting are divided into six grades according to chemical composition, namely, al99.85, Al99.80, Al99.70, Al99.60, Al99.50 and Al99.00" (note: the number after Al is aluminum content). At present, what some people call "A00" aluminum is actually aluminum with a purity of 99.7%, which is called "standard aluminum" in the London market. As we all know, China's technical standards in the 1950s all came from the former Soviet Union. "A00" is a Russian brand in Soviet national standards, and "A" is a Russian letter, not an English "A" or a Chinese phonetic alphabet. In line with international standards, it is more accurate to call it "standard aluminum". Standard aluminum is an aluminum ingot with 99.7% aluminum content, registered in London market.
This guy, there should be no problem But copper is a heavy metal, and copper ions may be toxic. Be careful not to deal with the solution containing copper ions for a long time, or you will lose out one day. One more thing, getting sick is a long process. Will not affect your normal work life. And it's good for you to go to the hospital regularly every year.