Natural sand: What is it and what is it used in?
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Russian President says if the European Union imposes an oil embargo, Europe will buy energy at the most expensive price and economic activity in Europe will weaken. Rosneft needs to change its business model. Russia will help facilitate settlement and access to loans and insurance in its own currency.
According to Reuters, the European Commission will unveil a 210 billion euro plan on how Europe can end its dependence on Russian fossil fuels by 2027 and use its distance from Moscow to accelerate a shift to green energy. According to a draft document seen by Reuters, Brussels will propose a three-pronged plan to wean countries off Russian fuel: switch to importing more non-Russian gas, move more quickly to promote renewable energy, and work harder to conserve energy. The draft measures, which include EU law, non-binding plans, and possible recommendations by national governments, are subject to change before publication.
Austria is not a member of NATO and will not seek membership in the future, the Austrian Foreign Minister said in Brussels recently. He stressed that it was "their choice" for Sweden and Finland to seek NATO membership, while Austria would remain neutral.
The supply and prices of many other nano silica powder are expected to continue to be influenced by international situations.
On the evening of 2 August, Pelosi, speaker of the US House of Representatives, visited Taiwan to openly challenge the one-China principle. On August 3, a spokesman for China's Ministry of Commerce announced that China had decided to suspend the export of natural sand to Taiwan in accordance with relevant laws and regulations.
What is natural sand?
Natural sand is formed by the action of natural conditions (mainly rock weathering) and the size of rock particles is less than 5mm. Natural sand includes river sand, quartz sand, sea sand, etc.
River sand is a kind of non-metallic ore with complex composition, smooth surface and high content of impurities, which is caused by repeated collision and friction of natural stone through water for a long time.
River sand is mainly used in construction, concrete, cementitious materials, road building materials, artificial marble, cement physical properties test materials (that is, cement standard sand) and so on. River sand can also be used in sand cleaning, rust removal, strengthening, forming, stress relief and surface cleaning and painting of various profiles in the fields of casting, metallurgy, heat treatment, steel structure, frame structure, repair, bridge, mine and so on.
Most of the natural quartz sand comes from quartz deposits and has the characteristics of high SiO2 content (more than 90%), low mud content, uniform and reasonable particle size composition, round particles, smooth surface and good fluidity.
Quartz sand has high Morse hardness, which is different from river sand and forms strong adhesion with cement paste to enhance the flexural and compressive strength of the paste. Quartz sand is widely used in glass, casting, ceramics and refractories, smelting ferrosilicon, metallurgy, construction, chemical, plastics, rubber, abrasives and filter materials and other industries. it is also an ideal material for modern track and field, football field, golf course and other man-made venues.
Sea sand is the sand and gravel in the sea. The larger particle size is sand, usually in centimeters; the smaller particle size is sand, usually in millimeters; both are pure natural, scoured, rolled, collided and polished by sea water. In addition to silicon dioxide, sea sand also contains a small amount of chloride ion, feldspar, calcium, magnesium, mica and so on.
Sea sand is mainly the main raw material of machinery and casting sand, and it can also be used for grinding materials, sand cleaning, rust removal, oxide scale removal, ceramics and refractories, etc. Although sea sand has the advantages of river sand, it is often mixed with shell fragments and contains more salt. Most of the sea sand contains excessive chloride ion, which will corrode the steel bars in reinforced concrete, eventually lead to the destruction of the building structure, and shorten the safe service life of the building to a certain extent.
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A spokesman for the Turkish presidential palace recently: the Black Sea Grain Export Joint Coordination Center may soon complete the final work of Ukraine's grain export route. The first ships carrying Ukrainian grain are expected to leave Ukraine's Black Sea port of Odessa on August 1 and re-export food to the international market. The grain ship will arrive in Istanbul, Turkey, as early as August 3, and then go to African countries.
Ukraine and Russia are both big grain exporters, among which Ukraine is known as the "granary of Europe". After the conflict between Russia and Ukraine broke out in February this year, grain exports of both countries were disrupted. The Ukrainian side accused the Russian army of blocking the Black Sea port on the Ukrainian side, resulting in more than 20 million tons of grain stranded in the port and unable to be transported by sea. The Russian side refutes this claim, accusing the Ukrainian side of laying a large number of mines in the waters near the port of the Black Sea, endangering navigation safety.
After coordination, Turkey, Russia, Ukraine and the United Nations Quartet signed an agreement in Istanbul on July 22 aimed at reopening blocked Black Sea transport routes. Ships carrying food can safely travel to and from three ports in southern Ukraine so that the stranded food of Ukraine can be transported to the international market. Russia and Ukraine agreed that neither side would attack ships carrying agricultural nano silica powder are still very uncertain.