Production of magnesium compound
First Claim
12. IN THE PROCESS FOR MAKING MAGNESIUM HYDROXIDE OF HIGH PURITY AND RAPID SETTLING WHEREIN INCOMING MAGNESIUM CHLORIDE SOLUTION IS MIXED WITH MAGNESIUM HYDROXIDE SEED CRYSTALS AND IS REACTED WITH DRY CALCINED DOLOMITE OF PARTICLES SIZE NOT LESS THAN 200 MESH IN A SERIES OF REACTION ZONES, NAD IMPURITES-ENRICHED UNDER-FLOWS ARE WITHDRAWN FROM THE REACTION ZONES AND MAGNESIUM HYDROXIDE SLURRY IS WITHDRAWN AS OVERFLOW FROM SAID ZONES, THE IMPROVEMENT WHEREIN CONCENTRATED AQUEOUS MAGNESIUM CHLORIDE SOLUTION IS MIXED WITH MAGNESIUM HYDROXIDE SEED CRYSTALS IN AN AMOUNT OF FROM 5 TO 35 TIMES THE AMOUNT OF MAGNESIUM HYDROXIDE BEING PRECIPITATED IN A FIRST REACTION ZONE AND THEN THE MIXTURE IS VIGOROUSLY AGITATED WITH CALCINED DOLOMITE IN A FIRST REACTION ZONE SAID DOLOMITE BEING PRESENT IN AMOUNT GREATER THAN WILL REACT STOICHIOMETRICALLY WITH THE MAGNESIUM CHLORIDE OF SAID SOLUTION, AN OVERFLOW COMPRISING AN AQUEOUS SLURRY OF MAGNESIUM HYDROXIDE CRYSTALS AND UNREACTED ZONE, IN SPENT BRINE IS WITHDRAWN TO A SECOND REACTION ZONE, A MINOR AMOUNT OF MAGNESIUM CHLORIDE SOLUTION SUFFICIENT TO REACT STOICHIOMETRICALLY WITH SAID UNREACTED DOLOMITE IS ADMIXED IN SAID SECOND ZONE WITH GENTLE AGITATION, AN OVERFLOW IS WITHDRAWN THEREFROM, SAID OVERFLOW COMPRISING A MAGNESIUM HYDROXIDE SLURRY IN SPENT BRINE, THE MAGNESIUM ION CONTENT OF THE SPENT BRINE OF EACH SAID OVERFLOW NOT EXCEEDING 0.3 GRAM PER LITER, CALCULATED AS MGO, AND THE TOTAL SOLIDS CONTENT IN EACH REACTION ZONE BEING AT LEAST 40 GRAMS PER LITER, ADN SEPARATING MAGNESIUM HYDROXIDE FROM THE OVERFLOW FROM THE SECOND ZONE.
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8 Citations
12 Claims
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12. IN THE PROCESS FOR MAKING MAGNESIUM HYDROXIDE OF HIGH PURITY AND RAPID SETTLING WHEREIN INCOMING MAGNESIUM CHLORIDE SOLUTION IS MIXED WITH MAGNESIUM HYDROXIDE SEED CRYSTALS AND IS REACTED WITH DRY CALCINED DOLOMITE OF PARTICLES SIZE NOT LESS THAN 200 MESH IN A SERIES OF REACTION ZONES, NAD IMPURITES-ENRICHED UNDER-FLOWS ARE WITHDRAWN FROM THE REACTION ZONES AND MAGNESIUM HYDROXIDE SLURRY IS WITHDRAWN AS OVERFLOW FROM SAID ZONES, THE IMPROVEMENT WHEREIN CONCENTRATED AQUEOUS MAGNESIUM CHLORIDE SOLUTION IS MIXED WITH MAGNESIUM HYDROXIDE SEED CRYSTALS IN AN AMOUNT OF FROM 5 TO 35 TIMES THE AMOUNT OF MAGNESIUM HYDROXIDE BEING PRECIPITATED IN A FIRST REACTION ZONE AND THEN THE MIXTURE IS VIGOROUSLY AGITATED WITH CALCINED DOLOMITE IN A FIRST REACTION ZONE SAID DOLOMITE BEING PRESENT IN AMOUNT GREATER THAN WILL REACT STOICHIOMETRICALLY WITH THE MAGNESIUM CHLORIDE OF SAID SOLUTION, AN OVERFLOW COMPRISING AN AQUEOUS SLURRY OF MAGNESIUM HYDROXIDE CRYSTALS AND UNREACTED ZONE, IN SPENT BRINE IS WITHDRAWN TO A SECOND REACTION ZONE, A MINOR AMOUNT OF MAGNESIUM CHLORIDE SOLUTION SUFFICIENT TO REACT STOICHIOMETRICALLY WITH SAID UNREACTED DOLOMITE IS ADMIXED IN SAID SECOND ZONE WITH GENTLE AGITATION, AN OVERFLOW IS WITHDRAWN THEREFROM, SAID OVERFLOW COMPRISING A MAGNESIUM HYDROXIDE SLURRY IN SPENT BRINE, THE MAGNESIUM ION CONTENT OF THE SPENT BRINE OF EACH SAID OVERFLOW NOT EXCEEDING 0.3 GRAM PER LITER, CALCULATED AS MGO, AND THE TOTAL SOLIDS CONTENT IN EACH REACTION ZONE BEING AT LEAST 40 GRAMS PER LITER, ADN SEPARATING MAGNESIUM HYDROXIDE FROM THE OVERFLOW FROM THE SECOND ZONE.
Specification
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- Resources
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Current AssigneeArthur W. Vettel, Robert D. Israel
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Original AssigneeArthur W. Vettel, Robert D. Israel
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InventorsVettel, Arthur W., Israel, Robert D.
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Application NumberUS03/553,268Time in Patent Office1,300 DaysField of SearchUS Class Current423/160CPC Class CodesC01F 5/22 from magnesium compounds wi...
