In this rapidly developing industrial era, major companies and factories are improving their products, and using different methods or materials to manufacture the same product, and then testing its cost-effectiveness and practicality, and finally must be the product in the pre-sale as well as post-sale quality assurance, so in the industry usually use a variety of chemicals, some single use, some mixed use in order to make the product better, and some are used to make the product better. Some are used singly and some are mixed in order to make the product better. Soda lime is one of these chemical mixtures.
A, the main components of soda lime and its use
Soda lime, also known as sodium lime, the surface of the loose and porous, white or beige powder, which consists of about 75% of the calcium oxide CaO, about 20% of the water H?O, about 3% of the sodium hydroxide NaOH, as well as about 1% potassium hydroxide KOH combined into a mixture of calcium oxide CaO, about 20% of the water H?O, about 3% of the sodium hydroxide NaOH, and about 1% potassium hydroxide KOH. KOH. Industrial soda lime is also known as caustic soda.
The main uses of soda lime: Soda lime has a wide range of uses, and plays different roles in different industrial production, and in the society that uses caustic soda the most is the manufacturing sector of chemicals, through a variety of chemical reactions that occur together with the soda lime, so as to get the required
Another chemical substance. Also caustic soda has many applications in aluminum refining, tungsten refining, paper making and soap making. Caustic soda can be used in the production of dyes, plastics, pharmaceuticals and organic intermediates, caustic soda can also be used in the old rubber recycling industry, and can also be used for a variety of metal smelting and the production of inorganic salts. Soda lime can also be used as a desiccant.
Two, soda-lime drying and absorption of what
Soda-lime is also a desiccant, in which the components of the calcium oxide to play a drying role, mainly used for the drying of neutral or alkaline gases, such as: NH?,CO,O?,N?,H?,PH?, so that lighter impurities containing pure oxygen. Pure oxygen with less impurities can be obtained. Desiccants are categorized as alkaline, neutral and acidic, and the acidity or alkalinity of the substance should be determined at the time of selection before drying. Soda lime has drying function and absorption function at the same time, it can absorb gases through reaction, most of them belong to acidic gases, for example: SO?, H?S, HCl, CO? and other acidic gases, after removing these gases, the impurities mixed in the purpose gas are removed, so it can also achieve the purification of the impurities.
Three, the use of soda lime
Caustic soda has a wide range of applications in the national economy, many industrial sectors need caustic soda. The most used caustic soda is the manufacturing sector of chemicals, followed by paper, aluminum, tungsten, rayon, rayon and soap manufacturing sector. In addition, in the production of dyestuffs, plastics, pharmaceuticals and organic intermediates, the regeneration of old rubber, the production of sodium metal, water electrolysis and the production of inorganic salts, the production of borax, chromium salts, manganates, phosphates, etc., but also to use a lot of caustic soda. Industrial sodium hydroxide should be consistent with national standards GB?209-93; industrial ion exchange membrane sodium hydroxide should be consistent with national standards GB/T?11199-89; chemical fiber sodium hydroxide should be consistent with national standards GB?11212-89; edible sodium hydroxide should be consistent with national standards GB?5175-85.
Fourth, soda lime on the Human injury
It has a solubilizing effect on proteins, strong irritation and corrosiveness. With 0.02% solution drops into the rabbit eye, can cause corneal epithelial damage. Intraperitoneal LD50:?40?mg/kg in mice, oral LDLo:500?mg/kg in rabbits.The dust irritates the eyes and respiratory tract, corrodes the nasal septum; splashed on the skin, especially splashed on the mucous membranes, it can produce soft scabs and penetrate into the deeper tissues, leaving scarring after burns; splashed into the eyes, it not only damages the cornea but also causes damage to deeper tissues of the eyes, and in serious cases, can lead to blindness; accidental ingestion can cause The digestive tract burns, colic, mucous membrane erosion, vomiting bloody stomach contents, bloody diarrhea, sometimes mute, dysphagia, shock, gastrointestinal perforation, gastrointestinal stenosis can occur in the late stage.
Fifth, the protection of soda-lime
Large amounts of contact with soda-lime should wear protective gear, coveralls or work cap should be made of cotton or appropriate synthetic materials. Operators must wear work clothes, masks, protective glasses, rubber gloves, rubber aprons, long rubber boots and other labor protection items when working. Neutral and hydrophobic ointment should be applied to the skin. When exposed to slaked lime in flake or granular form, the workplace should be ventilated, and the maximum permissible concentration in the indoor air is China MAC?0.5 mg/m3 (as NaOH), and USA ACGIH?TLVC?2 mg/m3. When there is a possibility of being exposed to its dust, a hood-type electrically-fed, filtered dust respirator must be worn. If necessary, wear an air respirator. Operators must be specially trained and strictly follow the operating procedures. It is recommended that the operator wear a hood-type electrically powered air supply filtering dust respirator, rubberized acid and alkali resistant clothing, and rubberized acid and alkali resistant gloves. Keep away from flammable and combustible materials. Avoid generating dust. Avoid contact with acids. Load and unload lightly when handling to prevent damage to packaging and containers. Equipped with emergency response equipment for leakage. Empty containers may retain hazardous materials. When diluting or preparing solutions, add alkali to water to avoid boiling and splashing.
The above is about the application of soda lime and drying and removing impurities and other functions, I hope to help you understand the use of soda lime in industry and daily life. But the harm of soda lime on the human body is also a lot, it can dissolve the body's protein, at the same time, strong irritation and corrosive make people feel uncomfortable, splashing into the eyes is easy to destroy the cornea, and even damage to the eyes of the deeper tissues, which leads to blindness, so soda lime in the process of applying the use of attention and protective measures together.