Assertion: magnesium hydroxide | /r/HasProperty | precipitated in stage
Facets:
value: from the mother liquor
type: OTHER
value: from the resulting solution
type: OTHER
Source sentences:
text: In a method of producing magnesium hydroxide and a non-contaminated calcium chloride efiluent solution from an aqueous solution containing magnesium chloride, the steps which comprise, slaking a form of quick lime selected from the group consisting of calcined lime and dolime, reacting said slaked lime in a first stage precipitation with said aqueous solution containing magnesium chloride in an amount such that a slight excess of Ca(OI-I) is maintained corresponding to a soluble alkalinity of from about 4 to about 6 mls., thereby forming a suspension comprising magnesium hydroxide as a first stage precipitate suspended in a solution containing calcium chloride and residual unprecipitated magnesium values, treating the suspension so-produced in a second stage precipitation with an amount of an alkaline precipitant corresponding to a soluble alkalinity of from about 20 to about 24 mls., selected from the group of slaked dolime, slaked lime, and NaOH, sufficient to precipitate the residual magnesium values as magnesium hydroxide, and separating the magnesium hydroxide precipitated in both stages from the resulting solution.
text: In a method of producing magnesium hydroxide from an aqueous brine consisting essentially of from 16 to 18 percent by weight calcium chloride and 8 to 10 percent magnesium chloride, the balance being water and minor amounts of other halide salts, the steps which comprise, slaking a form of quick lime selected from the group consisting of calcined lime and dolime with a slaking solution containing about 10 percent by weight calcium chloride, reacting said selected slaked quick lime with said aqueous brine at a temperature within the range of from about 25 to about 85 C. in a first stage precipitation at a soluble alkalinity of from about 4 to 6 milliliters, inclusive, thereby to form a suspension of first stage magnesium hydroxide precipitate in an aqueous calcium chloride mother liquor containing unprecipitated magnesium values, treating the suspension so-formed in a second stage precipitation at a soluble alkalinity of from about 20 to 24 milliliters, inclusive, with an alkaline precipitant to precipitate the residual magnesium values as second stage magnesium hydroxide precipitate, and separating the magnesium hydroxide precipitated in both stages from the mother liquor.