JPS57118021A - Manufacture of high-purity gypsum - Google Patents

Manufacture of high-purity gypsum

Info

Publication number
JPS57118021A
JPS57118021A JP10781A JP10781A JPS57118021A JP S57118021 A JPS57118021 A JP S57118021A JP 10781 A JP10781 A JP 10781A JP 10781 A JP10781 A JP 10781A JP S57118021 A JPS57118021 A JP S57118021A
Authority
JP
Japan
Prior art keywords
gypsum
soln
ions
sodium sulfate
crystals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10781A
Other languages
Japanese (ja)
Inventor
Tomio Fujikawa
Nobuo Kuno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central Glass Co Ltd
Original Assignee
Central Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Central Glass Co Ltd filed Critical Central Glass Co Ltd
Priority to JP10781A priority Critical patent/JPS57118021A/en
Publication of JPS57118021A publication Critical patent/JPS57118021A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates

Abstract

PURPOSE: To manufacture high-purity white gypsum applicable to various uses by reacting a sodium sulfate soln. by-produced from a process for desulfurizing stack gas after burning heavy oil with a soluble calcium salt at a low pH.
CONSTITUTION: An aqueous sodium sulfate soln. contg. several 10ppm V, Fe, Ni and other heavy metallic impurities after desulfurizing stack gas is adjusted to 2W6pH, and a soluble calcium salt such as CaCl2 is added to the soln. to obtain gypsum crystals. Since V ions in the soln. are converted into condensation type ions and made larger as the pH is lowered, the V ions become unfit for the ionic radius of ionic gypsum crystals, and it becomes difficult for the V ions to enter the crystals. Accordingly, the concn. of V in gypsum is reduced. Other heavy metals have similar tendency. By lowering the pH of the sodium sulfate soln. within a range where the apparatus is not corroded prior to the reaction, high-purity gypsum is obtd.
COPYRIGHT: (C)1982,JPO&Japio
JP10781A 1981-01-06 1981-01-06 Manufacture of high-purity gypsum Pending JPS57118021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10781A JPS57118021A (en) 1981-01-06 1981-01-06 Manufacture of high-purity gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10781A JPS57118021A (en) 1981-01-06 1981-01-06 Manufacture of high-purity gypsum

Publications (1)

Publication Number Publication Date
JPS57118021A true JPS57118021A (en) 1982-07-22

Family

ID=11464852

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10781A Pending JPS57118021A (en) 1981-01-06 1981-01-06 Manufacture of high-purity gypsum

Country Status (1)

Country Link
JP (1) JPS57118021A (en)

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