Method of thermochemical activation of aluminum silicate potassium mineral (synnyrite) by using magnesium carbonate

Authors: Гуляшинов П. А., Алексеева Е. Н., Будаева А. Д., Антропова И. Г. 

The efficient method is developed for the thermochemical activation of rebellious aluminum silicate potassium mineral (synnyrite from Kalyum site of the Synnyr alkaline massif) using an additive of magnesium carbonate (MgCO3) to make K-feldspar component of the initial raw material acid-soluble. It is shown that the basic mineral of synnyrite are microcline and orthoclase

from potash feldspar group (64.2%) with general chemical formula K[AlSi3O8], and a potassic kind of nepheline K[AlSiO4]—calcilite (23.6%). It is found that during thermochemical interaction between synnyrite and magnesium carbonate, decomposition of potassic feldspar (K[AlSi3O8]) takes place with formation of chemically active leucite (K[AlSi2O6]), while silica is bound by magnesium oxide into two magnesium silicate—forsterite (Mg2SiO4). The optimized parameters of synnyrite and magnesium carbonate baking ensure maximum decomposition of K-feldspar component. The developed thermochemical activation method for synnyrite allows reduction in the temperature of thermal treatment with formation of acid-soluble compounds by 100–200 0С as against the known analogs (baking with calcium carbonate—1250–1300 0С; thermal decomposition without additives—1300–1350 0С). Thermochemical activation of synnyrite with magnesium carbonate allows production of magnesium-bearing calcilite–leucite concentrate suitable for the subsequent sulfuric treatment with production of magnesium sulfate in addition to alumina and potassium salts.

Keywords: Synnyrite, magnesium carbonate, potassic feldspar, thermochemical activation, leucite, calcilite.
For citation:

Gulyashinov P. A., Alekseeva E. N., Budaeva A. D., Antropova I. G. Method of thermochemical activation of aluminum silicate potassium mineral (synnyrite) by using magnesium carbonate. MIAB. Mining Inf. Anal. Bull. 2019;(12):180-190. [In Russ]. DOI: 10.25018/0236-1493-201912-0-180-190.


The study was supported in the framework of the Republican Research Contest 2019, Republic of Buryatia.

Issue number: 12
Year: 2019
Page number: 180-190
ISBN: 0236-1493
DOI: 10.25018/0236-1493-2019-12-0-180-190
Article receipt date: 03.10.2019
Date of review receipt: 11.11.2019
Date of the editorial board′s decision on the article′s publishing: 11.11.2019
About authors:

P.A. Gulyashinov1, Cand. Sci. (Eng.),
Junior Researcher, e-mail:,
E.N. Alekseeva1, Leading Engineer, e-mail:,
A.D. Budaeva1, Junior Researcher, e-mail:,
I.G. Antropova1, Cand. Sci. (Eng.), Head of Laboratory, e-mail:,
1 Baikal Institute of Nature Management of Siberian Branch
of Russian Academy of Sciences, 670047, Ulan-Ude, Buryatia, Russia.

For contacts:

P.A. Gulyashinov, e-mail:


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