Recovery of lithium carbonate from contaminated lithium bromide
OwnerBozena Nenna Olssoninventor
Life of this patent
Estimating the term…
Abstract
The invention relates to a method and plant for the recovery of lithium carbonate from contaminated lithium bromide. The contaminated lithium bromide is heated and carbonate is added in order to principate lithium carbonate. The lithium bromide, being contaminated with metals and/or organic compounds. Metals such as Cu2+, Cr3+, Cr6+, Fe2+ and Fe3+ and/or organic compounds such as tensides, anticorrosive agents and antifoaming agents. The lithium carbonate is preferably recovered using sodium carbonate.
Claims17
A method for recovery of lithium carbonate recovery from a metal contaminated lithium bromide comprising the steps of
- a) providing a solution of the metal contaminated lithium bromide,
- b) heating the metal contaminated lithium bromide to a temperature of from about 25 to about 45° C.,
- c) maintaining the temperature throughout the method,
- d) adding carbonate in solid form to the heated metal contaminated lithium bromide solution and
- e) precipitating solid lithium carbonate.
Method according to any of the preceding claims, wherein the temperature is from about 30° C. to about 45° C.
The method according to any of the preceding claims, wherein the carbonate used in step d) is sodium carbonate and lithium carbonate is precipitated and sodium bromide obtained as a solution in step e).
A method of lithium carbonate recovery from an organic compound contaminated lithium bromide comprising the steps of
- a) creating a solution of the organic compound contaminated lithium bromide,
- b) adding saturated carbonate preheated to a temperature of 25-45° C. to the organic compound contaminated lithium bromide solution and
- c) precipitation of solid lithium carbonate
The method according to any of the preceding claims, wherein the precipitated solid lithium carbonate is at least 90% pure lithium carbonate.
The method according to any of the preceding claims, wherein the precipitated solid lithium carbonate is from about 90% to 100% pure lithium carbonate.
Plant for lithium carbonate recovery from a contaminated lithium bromide according to any of the preceding claims.
Use of the solid lithium carbonate obtained according to any of the preceding claims.
Dependencies are inferred from the claim text.