Гексафторсиликат натрия химические свойства, назначение, производство
Химические свойства
white powder
Использование
In enamels for china and porcelain; manufacture of opal glass; as insecticide, rodenticide; mothproofing of woolens. Fluoridating agent for drinking water. Intermediate in production of synthetic cryolite.
Общее описание
Fine, white, odorless, powdered solid. Toxic by ingestion, inhalation and skin absorption. Used as a rodenticide.
Реакции воздуха и воды
Water soluble.
Профиль реактивности
Sodium fluorosilicate has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive.
Опасность
Toxic by ingestion and inhalation, strong
irritant to tissue.
Угроза здоровью
Inhalation of dust may irritate nose and throat. Ingestion causes symptoms similar to fluoride poisoning; compound is highly toxic; initial symptoms include nausea, cramps, vomiting, diarrhea, and dehydration; in severe cases, convulsions, shock, and cyanosis are followed by death in 2-4 hr. Contact with eyes causes irritation. Contact with skin causes rash, redness, and burning, sometimes followed by ulcer formation.
Пожароопасность
Behavior in Fire: Decomposes at red heat
Промышленное использование
Sodium fluorosilicate (Na2SiF6) is a white, isomorphous powder. Solubility in water is similar to that of NaF. In
acid pH, solubility improves.
Commercially, Na2SiF6 is produced by treatment of fluorosilic acid with sodium chloride,
as shown in the following reaction:
H2SiF6 + 2NaCl = Na2SiF6 + 2HCl
Профиль безопасности
Poison by ingestion and
subcutaneous routes. A skin and severe eye
irritant. An insecticide. When heated to
decomposition it emits very toxic fumes of
Fand Na2O.
Возможный контакт
Sodium hexafluorosilicate is as a rodenticide; as an intermediate in production of synthetic cyrolite; as an insecticide in delousing and in mothproofing of woolens.
Перевозки
UN2674/Sodium fluorosilicate, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.
Методы очистки
Crystallise it from hot water (40mL/g) by cooling.
Несовместимости
Reacts with acids to produce hydrogen fluoride, a highly corrosive and poisonous gas.
Гексафторсиликат натрия препаратная продукция и сырье
сырьё
препарат