| 摘要 |
A method of reducing the calcium concentration of aqueous solutions which comprises contacting the solution, preferably at an elevated temperature, with magnesium carbonate which preferably has been freshly prepared. The amount of the magnesium carbonate is such as to effect substantial precipitation of the calcium as a calcium containing carbonate. The carbonate can either be left with the solution to stabilize it against pH shifts, for example in the extraction and processing of beet sugar, or can be separated from the solution, as where the presence of the calcium containing solid is objectionable, such as in boiler feed water treatment. The method is also useful in reducing calcium concentrations in sea salt solutions during recovery of table salt, in preventing scaling in boiler water and in the production of products where process conditions are sensitive to calcium levels. |
