ALKALI-METAL-CARBONATE-CONTAINING NITRATE SALT COMPOSITIONS AND USE THEREOF AS HEAT TRANSFER MEDIUM OR HEAT STORAGE MEDIUM

摘要

The invention relates to a nitrate salt composition, containing as the essential constituents A) an alkali metal nitrate and optionally an alkali metal nitrite in a total amount in the range of 90 to 99.84% by weight, and B) an alkali metal compound selected from the group comprising B1) alkali metal oxide, B2) alkali metal carbonate, B3) alkali metal compound that decomposes in the temperature range of 250°C to 600°C to form alkali metal oxide or alkali metal carbonate, B4) alkali metal hydroxide MetOH, in which Met denotes lithium, sodium, potassium, rubidium, caesium, B5) alkali metal peroxide Met2O2, in which Met denotes lithium, sodium, potassium, rubidium, caesium, and B6) alkali metal superoxide MetO2, in which Met denotes sodium, potassium, rubidium, caesium in a total amount in the range of 0.16 to 10% by weight, the percentages being relative to the nitrate salt composition.