نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

انتقال فاز پیروفیلیت به ریورسایدیت، زئولیت‎های سدیک و هیدروگروسولر هیب‌شیت تحت شرایط گرمابی قلیایی

نویسندگان
1 دانشگاه تهران، پردیس علوم، دانشکدۀ زمین‌شناسی
2 دانشگاه تهران، پردیس علوم، دانشکدۀ شیمی
چکیده
در این پژوهش، انتقال فاز پیروفیلیت به زئولیتهای سدیک تا کلسیک و گروه توبرمورایت در حضور محلول‌های NaOH وCaCl2 بررسی شد. آزمایش‌ها در سه مرحله جداگانه تحت شرایط ثابت گرمابی (دمای 150 درجۀ سانتی‌گراد، زمان 72 ساعت) در اتوکلاوهای تفلونی انجام شد. ترکیب شیمیائی نمونۀ اولیه از روش XRF تعیین شد. موفورلوژی و کانی‌شناسی نمونه‌ها به‌ترتیب با (SEM) و (XRD) شناسائی شد. نتایج نشان‌ داد که در غلظت متغیر (1 تا 8 مول برلیتر) NaOH لوسیت، زئولیت‌های‎ سدیک آنالسیم و سودالیت تشکیل شد. زئولیت‎ کلسیک تحت تأثیر حضور Na+ (5/2- 5/1 مول برلیتر) و Ca+2 (1- 25/0 مول برلیتر) سنتز نشد بلکه ترکیباتی مانند ریورسایدیت، هیبشیت، هالیت، هیدروکسیکانکرینیت و تری‌کالسیلیت تشخیص داده شد. در بیش‌ترین غلظت Ca+2 (1 مول برلیتر)، ریورسایدیت (یکی از اعضای گروه توبرمورایت) و هیبشیت (یک نوع هیدروگروسولر) و در کم‌ترین غلظت Ca+2 (25/0 مول برلیتر) هالیت به‌عنوان محصول اصلی تشکیل شد. غلظت Ca+2 و نسبت یونی Na/Ca از عوامل مهم در سنتز این محصولات هستند.



کلیدواژه‌ها

عنوان مقاله English

Phase transfer of Pyrophyllite to Riversideite, Sodic Zeolites and Hibschite Hydrogrossular under Alkaline Hydrothermal Conditions

نویسندگان English

Elaheh Miri 1
Ali Kananian 1
Alireza Badiei 2
1 University of Tehran
2 University of Tehran
چکیده English

In this research, pyrophyllite phase transfer to tobermorite group and sodic to calcic zeolites was investigated in presence of NaOH and CaCl2 solutions. The experiments were carried out in three separate stages under constant hydrothermal conditions (temperature 150 °C, time 72 h) in the Teflon-lined autoclaves. The chemical composition of the initial sample was determined by XRF. Morphology and mineralogy of samples were characterized by SEM and XRD, respectively. The results showed that leucite and sodic zeolites (analcime, sodalite) were formed at variable concentration of NaOH (1–8 mol/l). The calcic zeolite was not synthesized in the presence of Na+ (1.5–2.5 mol/l) and Ca+2 (0.25-1 mol/l), but riversideite, hibschite, halite, hydroxycancrinite and trikalsilite were detected. Riversideite (a member of tobermorite group) and hibschite (a type of hydrogrossular) were formed at highest concentration of Ca+2 (1 mol/l), and halite was produced as a main product at lowest concentration of Ca+2 (0.25 mol/l). The concentration of Ca+2 and Na/Ca ratio are the main factors in the synthesis of these products.

کلیدواژه‌ها English

Pyrophyllite
Phase transfer
Hydrothermal alteration
Sodic zeolites
Alkaline solution
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