Recently, the national standard of "Water-saving Sanitary Ware" (GB/T 31436-2015) was released, and specific technical requirements were put forward for the water-saving performance of eight kinds of products such as toilets and showers, and it is planned to be implemented at the end of the year. This also makes the topic of water conservation rise again. Visit: not enough water-saving bathroom Recently, the reporter went to a large home store in Jiangbei to learn about the water saving situation of sanitary products. Taking the double-speed water-saving toilet as an example, the reporter found that only one brand has a product of less than 4 liters, which is in line with the new standard “high-efficiency water-saving toiletâ€. Almost all brand salespeople are unaware of the new national standard. In the store, the reporter randomly interviewed several consumers who bought the bathroom. Most of them think that the water-saving toilet can't save a few dollars. The reporter counted such an account: the new national standard water-saving toilet can only save 5 liters of water at a time, which can save 1 liter of water per flush of the old-fashioned toilet. The 3-room home uses 4 toilets per day, and the family saves about one year. 4.3 tons. Weapon: the smooth glaze of the toilet is very important When purchasing a water-saving toilet, it is not the water consumption of the toilet that is less water-saving. If the flushing is not clean, it will be more expensive. Liu Fucheng, the person in charge of the Chongqing area of ​​Kohler bathroom, told the reporter that the choice of water-saving toilets is still to choose a good reputation, big brands, products that have been certified by water. In addition, we must look at the three major hardware indicators: the most basic is to look at the ceramic glaze of the toilet. The general product enamel material is good, if the firing temperature is high, the water absorption rate will be lower, and the surface is not easy to hang dirty. Measure the drain diameter. To wash the dirt away with a small amount of water, first the toilet should have a larger discharge size and observe whether the interior of the sewage pipe is also glazed. Before buying, you can put your hand into the sewage pipe to see if the inner wall of the pipe has a smooth glazed inner wall, and then measure whether the diameter is large enough. The consumer can put the whole hand into the toilet mouth, generally suitable and large enough, the hand can be stretched freely. Finally, the toilet tank fittings are important, like the "heart" of the toilet, which is more prone to quality problems. When purchasing, choose accessories to pay attention to quality, low water injection noise, strong and durable, good air tightness, long-term immersion without water, no corrosion, no scale.
15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
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