Chinese name: magnesium chloride
Mbth: magnesium chloride hexahydrate
Chemical formula: magnesium chloride
Relative molecular weight: 95.2 1
Chemical category: inorganic salt-chloride
Control Type: Uncontrolled
Storage: sealed, dried and preserved.
brief introduction
Regulatory information
This product is not regulated. [ 1]
Character; Role; letter
White crystal at room temperature. Easy to absorb moisture. Two molecules of crystal water are lost at 100℃. At 1 10℃, some hydrochloric acid began to lose and decompose, and intense heat was converted into oxychloride, which was decomposed at about 1 18℃ when heated rapidly. 1G is dissolved in 0.6ml water, 0.3ml boiling water and 2ml ethanol. Its aqueous solution is neutral and its pH value is about 7. The relative density is 1.56. The median lethal dose (oral) of rats was 8. 1g/kg. Irritating. [1] Case number: 779 1- 18-6 [2]
use
Quantitative analysis of arsenic acid and phosphoric acid. Preparing magnesium-oxygen mixture, etc. [ 1]
physicochemical property
physical features
Relative density: 1.56 (hexahydrate), 2.325 (anhydrous) melting point: 1 18 (decomposed, hexahydrate), 7 12 (anhydrous)℃ boiling point:14/kloc. Anhydrous substance: colorless hexagonal crystal. Solubility: Soluble in water and ethanol. [3]
chemical property
1. Magnesium chloride hexahydrate can be hydrolyzed when heated, and magnesium oxide is generated by dehydration and hydrogen chloride when heated. 2. Magnesium and chlorine can be produced by electrolyzing anhydrous magnesium chloride in molten state. MgCl2 (melting) = electrolysis = mg+Cl2 = 3. Magnesium hydroxide precipitates in alkaline environment. Magnesium +2OH-= magnesium hydroxide
Precautions for use
Precautions for operation
Closed operation, full ventilation. Prevent dust from being released into the air of the workshop. Operators must be specially trained and strictly abide by the operating procedures. It is suggested that operators wear self-priming filter dust mask, chemical safety glasses, rubber acid and alkali resistant clothes and chemical resistant gloves. Avoid dust. Avoid contact with oxidants. Equipped with leakage emergency treatment equipment. Empty containers may leave harmful substances behind. [5]
Precautions for storage
Store in a cool, dry and well-ventilated warehouse. Stay away from fire and heat sources. Avoid direct sunlight. The package is sealed. Should be stored separately from oxidant, etc. , and should not be mixed. The storage area should be equipped with suitable materials to control leakage. [5]
Emergency treatment
Skin contact: take off contaminated clothes and rinse with plenty of running water. Eye contact: Lift eyelids and rinse with running water or normal saline. See a doctor. Inhalation: leave the scene quickly and go to a place with fresh air. Keep the respiratory tract unobstructed. If you have difficulty breathing, give oxygen. If breathing stops, give artificial respiration immediately. See a doctor. Intake: Drink enough warm water to induce vomiting. See a doctor. [5]
Function and use
1. It is an important inorganic raw material in chemical industry, used to produce magnesium products such as magnesium carbonate, magnesium hydroxide and magnesium oxide, and also used as raw material of antifreeze. 2. Used in metallurgical industry to produce metallic magnesium (molten electrolysis), liquid chlorine and high-purity magnesium oxide. 3. In the building materials industry, it is an important raw material for producing lightweight building materials such as glass fiber tiles, decorative boards, sanitary wares, ceilings, floor tiles, magnesia cement, ventilation pipes, anti-theft manhole covers, fire doors and windows, fire boards, partition boards and other high-rise building supplies such as artificial marble. Magnesite products can be made into high-quality magnesium tiles, high-quality fire boards, magnesium packaging boxes, magnesium decorative boards, lightweight wallboard, abrasives, stoves, fireworks fixatives and so on. 4. It can be used as food additive, protein coagulant, snow melting agent, refrigerant, dustproof agent, refractory material, etc. In other fields. Tofu made of salt water (magnesium chloride aqueous solution) is more tender and delicious than tofu made of gypsum. 5. Metallurgical industry: it is used to make refractories and adhesives for building furnace arms, and it is also the raw material for making No.2 flux and smelting metal magnesium. 6. Machinery industry: In daily life, magnesite can be made into mechanical packing boxes, triangular mats, furniture, etc., which is a good material for "replacing materials with soil". 7. Transportation industry: used as road deicing and snow melting agent, with fast deicing speed and low corrosiveness to vehicles, higher than sodium chloride. 8. Medicine: Dry bittern made of magnesium chloride can be used as medicine. Can be used as a laxative. 9. Agriculture: It can be used as magnesium fertilizer, potassium magnesium fertilizer and cotton defoliant. [6]
prepare
It is made by the reaction of magnesium oxide or magnesite with hydrochloric acid. The chemical equation is: MgO+2hcl = MgCl2+H2O MgO3+2hcl = MgCl2+CO2 = H2O [7].