Filter materials are often what we can see every day. With the vigorous promotion of the national heavy industry, many pollutants are present in the air. In general, people who come into contact with this area will wear masks or block some air from the air. Harmful impurities that cause a filtration process before inhalation. Activated carbon, which is encountered in daily life, also has this effect. Usually, we most often put it in tea boxes and have a filtering effect. So what exactly is a filtering process? Let's do an experiment.
- 液、固 - 气、大颗粒、小颗粒都很常见。 The process of purifying and purifying fluids through special devices has many filtering methods and a wide range of materials, including solid - liquid, solid - gas, large particles, and small particles. 固体颗粒发热气体）中的液体（或气体）透过介质，固体颗粒及其他物质被 过滤介质截留，从而使固体及其他物质与液体（或气体）分离的操作  。 Filtration is when the liquid (or gas) in the suspension (or heating gas containing solid particles) permeates the medium under the driving force or other external forces , and the solid particles and other substances are trapped by the filter medium, so that the solids and other substances and liquids ( Or gas) separation  .
A method for separating liquids from liquid-insoluble solids by taking advantage of differences in the solubility of substances. 过滤法除去粗 食盐中少量的泥沙烧杯中的混合物在过滤前应用玻璃棒搅拌，然后进行过滤。 For example , the mixture in the beaker with a small amount of coarse salt is removed by filtration. Before filtering, the mixture should be stirred with a glass rod and then filtered. If the solution is still cloudy after filtering, it should be filtered again until the solution becomes transparent. 2~3 次。 3. The method of washing the precipitate in the filter: Add distilled water to the filter with a flask or a dropper to cover the water surface with no sediment. After the solution has been completely filtered, repeat 2-3 times. 大厂矿企业，消毒、过滤等，供养殖、制糖、造纸、 自来水净化、 石油钻探、 化工 炼油、大型油库、新型化工纺织档尘等单位使用，它采用进口设备生产，具有耐酸、耐碱、耐高温、耐腐蚀、耐磨等优点，避免了国产原料效果差，寿命短的弊病。 Gehuajing: It is produced using imported polymer materials and is the latest environmentally friendly product. It is widely used in stable and large factories and mines, disinfection, filtration, etc., for breeding, sugar making, papermaking, tap water purification, oil drilling. It is used in chemical refining, large-scale oil depots, new chemical textiles, dust-proofing and other units. It is produced by imported equipment and has the advantages of acid resistance, alkali resistance, high temperature resistance, corrosion resistance, wear resistance, etc., avoiding the disadvantages of poor domestic raw materials and short life .
The filter paper is cracked. Cause of filtration: The lower end of the glass rod is close to the layer of filter paper. (The filter paper is punctured.) The beaker containing the mixture is not close to the glass rod. (The filter paper was broken by the mixture) Cause: The liquid level is higher than the edge of the filter paper. (The mixture flows directly from the gap between the filter paper and the funnel)
Bucket beaker glass rod, filter paper funnel angle is the same: "fun" refers to the funnel; "frame" refers to the funnel frame. 仪器：漏斗、漏斗架、烧杯、 玻璃棒、滤纸，并且强调滤纸 折叠的角度要与漏斗的角度一样。 These two sentences point out the equipment needed for the filtration operation experiment : funnel, funnel holder, beaker, glass rod, filter paper, and emphasize that the angle of the filter paper folding should be the same as the angle of the funnel. 静置：意思是说在过滤之前须将液体静置一会儿，使固体和液体充分分离。 Let it stand before filtering: This means that the liquid must be allowed to stand for a while before filtering, so that the solid and liquid can be fully separated. Do n’t forget the three leans and two lows: it means do n’t forget the three leans and two lows when filtering. 滤液的烧杯壁上，要使玻璃棒的底端靠在滤纸上，盛过滤液的烧杯嘴要靠在玻璃棒上；“两低”的意思是说滤纸边缘应略低于漏斗的边缘，所倒入的滤液的液面应略低于滤纸的边缘。 "Three leans" means that the end of the funnel neck should rest on the wall of the beaker that receives the filtrate, the bottom end of the glass rod should rest on the filter paper, and the beaker mouth holding the filter liquid should rest on the glass rod; "Means that the edge of the filter paper should be slightly lower than the edge of the funnel, and the liquid level of the filtrate to be poured should be slightly lower than the edge of the filter paper.
The filtering materials used to filter out different substances are different, but the physical conditions they react to are the same. It is useful to filter out the unnecessary things.
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