Original title: Precautions for use and maintenance of down-the-hole drill! The application of down-the-hole drill in geotechnical engineering is more and more extensive. It is closely used in open-pit mining, hydropower stations, highways, railways and other infrastructure projects. In order to ensure the safety and reliability of geotechnical engineering construction technology and extend its...

Original Title: Devouring Countless Children Every Year, don't Parents Pay Attention to These Fatal Hidden Dangers? Every parent has a safety responsibility letter about their children in their hearts. Although no one assesses them, they will strive to achieve 100% of the target. Recently, there is a piece of news that makes people heartache. At the time of the accident, two children were...

Original Title: Devouring Countless Children Every Year, don't Parents Pay Attention to These Fatal Hidden Dangers? Every parent has a safety responsibility letter about their children in their hearts. Although no one assesses them, they will strive to achieve 100% of the target. Recently, there is a piece of news that makes people heartache. At the time of the accident, two children were...

Original Title: Common Problems and Cause Analysis of Cemented Carbide Pressing Cemented carbide is a kind of alloy material made of hard compound of refractory metal and bonding metal by powder metallurgy process, which has high hardness, wear resistance, good strength and toughness. Because of its unique properties, it is often used to make rock drilling tools, mining tools, drilling tools,...

Original Title: Difference between Short-path Distillation and Molecular Distillation-Shanghai DEA Short-path distillation, "short path" refers to a shorter distance, in a broad sense, the evaporator adopts the design scheme that the distance from the evaporation surface to the condensation surface is less than 300 MM, which can be called a short-path distiller. In terms of design structure, it...

Original Title: Treatment Technology of Seawater Desalination Since the 1950s, seawater desalination technology has become one of the important ways to develop new water sources. Different departments and fields have different requirements for water quality. Let's take a look at the desalination technology: 1. Distillation method of seawater desalination treatment technology: A method of...

Original Title: [Dry Goods] Structures and Working Principles of 22 Kinds of Evaporation and Crystallization Equipment, Illustrated Central-circulation tubular evaporator The heating chamber of the central circulation tube evaporator is composed of a vertical heating tube bundle (boiling tube bundle). In the center of the tube bundle, there is a tube with a larger diameter, called the central...

Original title: What are the guard column and online filter of liquid chromatography? How to use it? In the previous video of ChromClass, we mentioned the protective column and online filter of liquid chromatography. At that time, some students were very confused. They look like the same thing, aren't they? What's the difference? Today we will tell you in detail. Guard post The guard column of...