Subramaniam, Appalasami
(1977)
The crystallisation of Alkaline-earth Metal Tungstates from solutions in Sodium Tungstate Melts.
Masters thesis, Universiti Sains Malaysia.
Abstract
Kerja ini mengemukakan suatu kajian mengenai penghabluran
Tungstat logam Alkali-Bumi dari larutan lebur Natrium Tungstat.
Keterlarutan Garam-Garam logam Alkali-Bumi pada suhu-suhu
yang berbeza antara 600° ke 1200°C telah didapati dari bahan bacaan yang
tertentu. Kajian kuantitatif peringkat awal mengenai penghabluran Titanat
Logam Alkali-Bumi dibuat dengan cora penyejukan perlahan yang berterusan
kepada larutan tepu lebur Logam Klorid Alkali-Buml dart suhu pengabl.wan
awtd, T~ = 1000° ke 1200°C, ke takat suhu ambien. Kesan suhu penghabluran
awol dan keterlarutan zat laruton suhu penghabluran awal(soling tindakon zat
larutan-pelarut) dan kadarcepat penyejukan atas bentuk hablur ohkir dikaii.
Hastl kojion ini dibanding dengon hasil kojion peringkat awol mengenai
penghobluran Tungstat Logam Alkali-Bumi dengan cora penyejukan perlahan
berterusan kepada larutantepu lebur Tungstat Natrium dari suhu-suhu penghabluran awal, T 0 = 800 ke 1000 C, ke takat suhu ambien. Tungstat
Natrium digunakan sebagai pelarut yang sesuai bagi penghabluran Tungstat
Logam Alkali~Bumi dalam lingkungkan bezantara suhu T
0 = 800° ke 1000°C dan kadar-kadar penyejukan RT = 40° ke 200° C sejam.
This work presents a study of the crystallisation of Alkaline-earth
Metal Tungstates from solutions in Sodium Tungstate Melts.
The solubilities of the Alkaline-earth Metal Salts in Sodium Tungstate
at various temperatures from 600° to 1200° C were obtained from the
I i terature •
Preliminary quantitative studies were made on the crystallisation of
Alkaline-earth Metal Titanates by slow continuous cooling of saturated solutions
in Alkaline-earth Metal Chloride Melts from initial crystallisation temperatures,
T0 = 1000° to 1200° C, down to ambient temperature. The effects of initial
crystallisation temperature and solute solubility at the initial crystallisation
temperature (solute-solvent interaction) and the rate of cooling on the final
crystal form and size were investigated. These results were compared with the
results of the preliminary studies on the crystallisation of Alkaline-earth Metal
Tungstates by slow continuous cooling of saturated solutions in Sodium Tungstate
Melts from initial crystallisation temperatures, T0 = 800°to 1000° C, down to
ambient temperature. Sodium Tungstate was a suitable solvent for crystallisation
of the Alkaline-earth Metal Tungstates within the temperature range T0 =8000
to I000°C and rates of cooling RT = 40° to 2000C/hr.
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