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Strontium is a kind of metallic element, the element symbol is Sr, the atomic number is 38, belongs to group 2A on the periodic table, is a kind of silvery white luster alkali earth metal. Its chemical properties are active. When heated to the melting point (769ºC), it burns, showing a red flame, and generates strontium oxide (SrO). Under the condition of pressure, it combines with oxygen to produce strontium oxide (SrO2). It is easy to combine with sulfur, selenium and halogen. The content of strontium in the Earth's crust is about 0.04%, ranking 15th in abundance. As strontium is very easy to react with air and water, so there is no natural state of strontium, are in the form of compounds, its main minerals are lapis lazuli and strontium. Strontium element widely exists in mineral water, is a kind of human body essential trace element, has the function of preventing arteriosclerosis, preventing bone fracture in osteoporosis patients, preventing thrombosis. Strontium (mass number 90) is a radioactive isotope that can be used as a source of beta rays with a half-life of 28.8 years. The metal strontium is used in the manufacture of alloys, photocells, and analytical chemistry, fireworks and so on. Strontium has a strong ability to absorb X-ray radiation and unique physical and chemical properties. It is widely used in various fields such as electronics, chemical industry, metallurgy, military industry, light industry, medicine and optics.
Introduction to the application of strontium
The metal strontium is used in the manufacture of alloys, photocells, and analytical chemistry, fireworks and so on. Strontium is widely used in various fields such as electronics, chemical industry, metallurgy, military industry, light industry, medicine and optics due to its strong function of absorbing X-ray radiation and unique physical and chemical properties. The majority of strontium compounds are used in the ceramics, glass and fireworks industries, with a small percentage used in other industries. The application of strontium in ceramic ferrite magnets and other applications in glass make the ceramic and glass industry the most important industry for the terminal application of strontium. The use of strontium nitrate in fireworks is as important to the strontium industry as it is to ceramic ferrite magnets. Strontium industrial flow chart
Electronics industry
In the electronic industry, strontium carbonate is widely used in the production of the fluorescent screen glass of color television picture tube (strontium carbonate has a strong ability to absorb X-rays). Using strontium carbonate to produce the fluorescent screen glass of color television picture tube has the advantages of good anti-ray performance, light quality, clear image and small deformation. Because of its high dielectric constant, strontium titanate is used in capacitor manufacturing and computer memory production, and strontium nitrate can be used as the emitter of electron tube. Strontium fluoride is also commonly used in the production of special large crystals in the electronics industry. Strontium titanate sometimes acts as a substrate in semiconductors and some optical and piezoelectric applications. It may also play a role in superconductors and radiation detectors. With rapid advances in science and technology and falling costs, the demand for strontium is likely to rise in the high-tech industry.
metallurgy
Strontium alloys are also used in the metallurgical industry. The addition of strontium metal to aluminum alloys can improve the properties of the finished products, especially those used in aerospace and automotive applications. Strontium also helps remove impurities from lead during the production of electrolytic zinc. Strontium carbonate dissolved in sulfuric acid reduces the amount of lead in the electrolyte and also removes zinc deposited in the cathode.
Light industry: ceramics, paints, fireworks
Strontium oxide, strontium nitrate and strontium chloride can be made of fireworks and flares. Strontium chromate is used as pigment, cement colorant, organic synthesis catalyst and anticorrosive coating. Strontium chromate is added to paint to form an anti-corrosion layer, which can effectively protect aluminum, especially aircraft casings and hulls, so strontium chromate is mainly used in the manufacture of anti-rust pigments. In ceramic glaze, strontium glaze has a good effect in replacing lead glaze. In addition to wide firing range, low firing temperature and can form a glossy glaze surface, but also has good wear resistance. So the strontium glaze becomes a good lead-free glaze, when it is used with the underglaze color agent, almost no adverse effect on the color material can be seen, but when it is shared with chrome tin red, a certain amount of calcium oxide must be added to the glaze to stabilize the tonal quality.
Antirust paint pigment
medicine
1. Medicine Strontium ranelate is a strontium salt containing Rennaic acid used to prevent fractures in osteoporosis patients. This drug helps the bones absorb more calcium. Medical experiments have demonstrated that strontium ranelate has dual pharmacological effects: on the one hand, strontium ranelate can increase collagen and non-collagen synthesis in osteoblast-enriched cells, and promote osteoblast-mediated bone formation by enhancing the proliferation of preosteoblasts. On the other hand, it can dose-dependent inhibit proosteoclast differentiation and thus inhibit osteoclast-mediated bone resorption. The drug is designed to prevent postmenopausal osteoporosis and reduce vertebral and hip fractures.
However, on April 25, 2013, the European Medicines Agency (EMA) issued a message restricting the use of the osteoporosis treatment strontium ranelate because of an increased risk of serious heart problems. Strontium ranelate is recommended only for the treatment of severe osteoporosis in postmenopausal women at high risk of fracture and severe osteoporosis in men at increased risk of fracture; And limit the use of strontium ranelate in patients with heart disease or circulatory disease.
2. Radionuclide strontium-89 is an important therapy for bone metastasis, helping to relieve bone pain and improve quality of life. The therapeutic effect of 89Sr is mainly to kill cancer cells by emitting beta rays to relieve pain, so as to improve the quality of life of patients and reduce the pain before dying. Another purpose is to shrink or disappear bone metastases, in order to alleviate the disease and prolong the patient's life. Strontium-89 has been proved by a large number of clinical studies: the total effective rate is 80%, which can not be compared with other therapeutic means, especially for the bone metastasis of prostate cancer and breast cancer. British research institutions demonstrated that after receiving strontium 89 treatment, 22% of patients with bone pain disappeared completely, more than 60% significantly reduced; Adherence to the use of strontium 89 in addition to control bone pain, but also can prevent recurrence.
3. Strontium chloride is also used in the production of desensitizing toothpaste for people with sensitive teeth. The main reason why strontium chloride is added in toothpaste is that strontium ion has the effect of resisting allergy, and the content of strontium chloride in toothpaste is generally about 1%.
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