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FORMATION OF HYDROXYL COMPLEXES OF Fe(II) IN AQUEOUS SOLUTIONS

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UDC: 543.632.53; 546.72

Eshova G.B., Rahimova M., Davlatshoeva J.A.,

Miraminzoda F.

REVIEWER: Suyariyon K.J.

 

Candidate of Chemical Sciences,

Associate Professor

 

REFERENCES

  1. Rakhimova M. Processes of formation of iron hydroxo complexes in various media / M. Rakhimova, E.F. Faizulloev, M.U. Boboev, M.A. Ismailova // Monograph. – Germany: “LAPLAMBERT”, 2017. – 145 p.
  2. Sokolovsky A.E. Hydroxo complex formation in the Fe3+-Hg2+-NO3--H2O system / A.E. Sokolovsky, E.V. Radion, N.V. Nazarenko // Journal of Applied Chemistry. 2002. - T. 75. No. 11. – Pp.1780-1783.
  3. Sokolovsky A.E. Hydroxocomplexation in the Fe3+-Co2+-NO3--H2O system. Proceedings of BSTU. Ser. 2, Chemistry and technology of inorganic substances. 2021. No. 1 (241). – Pp.35-39 doi.org/10.52065/2520-2669-2021-241-1-35-39
  4. Davydov Yu.P. Forms of presence of metal ions (radionuclides) in solution / Yu.P. Davydov, D. Yu. Davydov // Monograph. Minsk: Belaruskaya Nauka, 2011. – P.302.
  5. Faizulloev E.F., Hydroxyl complexation of Fe (III) in solutions of various compositions. / E.F. Faizulloev, M.M. Rakhimova, M.A. Ismoilova, Kh.Ch. Kamilov // Bulletin of TNU. Series Natural Sciences. 1/4(153). – Dushanbe: Sino, 2014. – Pp.76 - 81.
  6. Davlatshoeva J.A. /J.A. Davlatshoeva, G.B. Eshova, M. Rahimova, M.O. Guriev, L.V. Kvyatkovskaya // American Journal of Chemistry. 2017.7(2). – Pp.58- 65.
  7. Rakhimova M. Formation of glycinate complexes of iron(II) in solutions of different ionic strengths / M. Rakhimova, G.B. Eshova, D.A. Davlatshoeva, L.V. Kvyatkovskaya, F. Miraminzoda // Russ. J. Phys. Chem. 2020, 94. – Pp. 1560-1564.
  8. Koryakin Yu.V. Pure chemical reagents / Yu.V. Koryakin //M.: Chemistry, 1974. –406 p.
  9. Suslennikova V.M., Kiseleva E.K. Guide to the preparation of titrated solutions / V.M. Suslennikova, E.K. Kiseleva // - L.: Chemistry, 1968. – 144 p.
  10. Charlot G. Methods of analytical chemistry. Quantitative analysis of inorganic compounds / G. Charlot // - M.: Chemistry, 1965. – 930 p.
  11. Yakubov Kh.M. Application of oxometry to the study of complex formation / Kh.M. Yakubov // - Dushanbe, 1966. – 121 p.
  12. Pat. TJ 626 (Application No. 1300789 dated June 19, 2013). Bull. No. 97. 27.07. 2014.
  13. Zakharyevsky M.S. / M.S. Zakharyevsky, L. Oxedometer measurements //- Chemistry, 1968. – 118 p.
  14. Nikolsky B.P. / B.P. Nikolsky, L. Oxredmetry // Chemistry, 1975. – 304 p.
  15. Walkenbach D. Formulas in Excel 2013 / D. Walkenbach // - M.: Dialectics, 2019. – 720 p.

 

FORMATION OF Fe(II) HYDROXYL COMPLEXES IN AQUEOUS SOLUTIONS

Formation of hydroxyl complexes in the Fe(0)-Fe(II)-glycine-water system from pH at I=0.5 mol/l, temperature 298.15 K, СFe(II)=1×10-4 and СGly=3×10-3 mol/l were studied by the Clark–Nikolsky oxidative potential method. Experimental curves of the dependence of the EMF of the system on the concentrations of hydrogen, iron(II) and glycine ions: рН, рСох, pCL, respectively, are obtained. They allowed us to establish that the processes of complexation in the studied system proceed stepwise in a wide pH range from 1.0 to 8.2. The type and number of coordinated ligands and the total composition of the complex compounds formed were determined. Chemical models of complex formation reactions and model parameters of coordination compounds have been compiled. The values of the angular coefficients, the domain of dominance and the constants of the formation of complexes are determined. The formation of the following coordination compounds is shown: [Fe(OH)(H2O)5]+; [FeHL(H2O)5]2+; [Fe(HL)(OH)(H2O)4]+; [Fe(OH)2(H2O)4]0  and [Fe2(HL)2(OH)2(H2O)8]2+.

                Keywords: EMF, complex, iron (II), glycine, model, ionic strength, oxidative function, iteration.

 

                Information about the authors:  Eshova Chaykhana Bobonazarovna - Tajik National University, Candidate of Chemical Sciences, senior researcher. Address: 734025, Dushanbe Republic of Tajikistan, Rudaki Avenue, 17.  Phone: (+992) 918-23-01-82. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. 

                Davlatshoeva Jahonul Asankhonovna - Tajik National University, Candidate of Chemical Sciences, Associate Professor of the Department of Physical and Colloidal Psychology. Address: 734025, Dushanbe Republic of Tajikistan, Rudaki Avenue, 17.  Phone: (+992) 938-98-96-62. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

                Rahimova Mubashirkhan -Tajik National University, Doctor of Chemical Sciences, Professor. Address: 734025, Dushanbe Republic of Tajikistan, Rudaki Avenue, 17.  Phone: (+992) 918-76-90-70. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Miraminzoda Farida - Tajik National University, scientific Centurion. Address: 734025, Dushanbe Republic of Tajikistan, Rudaki Avenue, 17.  Phone: (+992) 987-27-18-93. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Article received 11.10.2023

Approved after review 06.01.024

Accepted for publication 16.03.2024

UDC: 666.941/.949

USE OF BSC AFTER ACID SOLUTION TO DEVELOP THE EXPANSION

PROPERTIES OF CEMENT  

Rajabov Sh.Kh.

INTRIODUCTION

REVIEWER: Samihov Sh.R.,

Doctor of Natural Sciences,

 Professor 

 

REFERENCES

  1. But Yu. M. Chemical technology of binders. – M. / Yu.M. Booth, M.M. Sychev, V.V. Timashev // Higher school, 1980. – P. 472.
  2. Volzhensky A.V. Mineral binders / A.V. Volzhensky // – M.: Stroyizdat, 1986. – P.463.
  3. Lotov V.A. Composition, properties of cement raw materials, production and properties of Portland cement clinker / V.A. Lotov // Guidelines for laboratory workshops and independent work on the course “Cement Technology”. – Tomsk: Publishing house. TPU, 2006. – 32 p.
  4. Palgunov P.P. Recycling of industrial waste / P.P. Palgunov, M.V. Sumarokov // – M.: Stroyizdat, 1990. – P. 346.
  5. Kikava O.Sh. Construction materials from industrial waste - “Ecology and Industry of Russia”. / Kikava O.Sh. // - 12 - 1997. – Pp.23-28.
  6. Galevsky G.V. Ecology and waste disposal in aluminum production. / G.V. Galevsky, N.M. Kulagin, M.Ya. Mintsis // - M.: Nauka, 2005. – P. 272.
  7. Kabirov Sh.O. A method for complex processing of solid fluorine-containing waste from aluminum production. Small patent for invention No. 515 / Sh.O. Kabirov, Kh.S. Safiev, N.M. Sirochov, B.S. Azizov, Kh.A. Mirpochaev, D.R. Ruziev, N.P. Mukhamediev, Kh.E. Boboev, Sh.Kh. Radjabov // – Dushanbe, 2012.
  8. Safiev Kh. Technology for producing cryolite and aluminum fluoride from alumina- and fluorine-containing waste from aluminum production / Sh.O. Kabirov, Kh.S. Safiev, N.M. Sirochov, B.S. Azizov, Kh.A. Mirpochaev, D.R. Ruziev, N.P. Mukhamediev, Kh.E. Boboev, Sh.Kh. Radzhabov // DAN of the Republic of Tajikistan. – Dushanbe, 2011. - T.54. - No. 10. – Pp.845-850.
  9. Istomin, S.P. New directions in the technology of processing highly dispersed fluorine-containing waste from aluminum production. / S.P. Istomin, B.P. Kurikov, S.G. Myasnikova // Non-ferrous metals. - 1999.- No. 3. – Pp.45-47.
  10. Sulimenko, L.M. Technology of mineral binding materials and products based on them: textbook. for universities. – 4th ed., revised. and additional / L.M. Sulimenko // – M.: Higher. school 2005. – P. 334.
  11. Yakovets Yu.S., Recycling of aluminum waste / Yu.S. Yakovets, A.V. Nifantieva // Young scientist, 2020. - No. 11 (41). – Pp.46-49.
  12. Istomin S.P. Study of the flotation method for producing cryolite. / S.P. Istomin, S.G. Myasnikova // Non-ferrous metals. - 1999. - No 3. – Pp.56-58.
  13. Rakov E.G. Chemistry and technology of inorganic fluorides / Rakov E.G. // -M.: Publishing house MHTI im. DI. Mendeleeva, 1990. – P. 162.
  14. Sulimenko L.M. Technologies of mineral binders and products based on them / L.M. Sulimenko // Textbook. for universities. – 3rd ed., revised. and additional. – M.: Higher. School, 2000. – P. 302.
  15. Kulikov B.P. Recycling of aluminum production waste. / B.P. Kulikov // Istomin 2nd ed. – Krasnoyarsk, 2004. – P. 480.
  16. Azizov B.S., Technology for processing the solid residue formed during the sulfuric acid decomposition of alumina- and fluorine-containing waste from aluminum production. / B.S. Azizov, Sh.O. Kabirov, D. R. Ruziev, A. Kh. Safiev, Sh. Kh. Radzhabov // DAN of the Republic of Tajikistan. – Dushanbe, - 2015, vol. 58, No. 2. – Pp.153-160.
  17. Rajabov Sh.Kh., Application of secondary solid waste after acid decomposition as an active mineral additive. / Sh.H. Rajabov, A.S. Faizulloev. // Materials of the II International Scientific and Practical Conference of TNU. Modern problems of chemistry, application and their prospects: Dushanbe - May 14-15, 2021. – Pp.234-242.
  18. Rajabov Sh.Kh. Application of secondary solid waste after acid decomposition as an active mineral additive. / Sh.H. Rajabov // Bulletin of Dangara State University. Series No. 4 (18) 2022. – Pp.6-14
  19. Rajabov Sh.Kh. Studying the process of joint acid decomposition of fluorite concentrate and fluorine-containing waste from aluminum production. // Materials of the international scientific and practical conference “The use of modern teaching methods in educational institutions: Problems and prospects”, dedicated to the “2020-2040 years of the twentieth anniversary of the study of natural, exact and mathematical sciences in the field of science and education”, “65th anniversary of the Faculty of Chemistry of TNU " and "55th anniversary of the Department of Methods of Teaching Chemistry of the Faculty of Chemistry of TNU." / Sh.H. Rajabov // Dushanbe October 19-20, 2023. – Pp.262-269.
  20. Rajabov Sh.Kh. The use of calcium sulfate containing aluminum production waste as an active mineral additive to Portland cement. // Materials of the international scientific and practical conference on the topic “Development of natural, exact and mathematical sciences in the present time: problems and prospects. / Sh.H. Rajabov // Dangara State University April 28 – 29, 2023: - “Mulkvar”. – Pp. 405-410.

 

USE OF BSC AFTER ACID SOLUTION TO DEVELOP THE EXPANSION

PROPERTIES OF CEMENT

Currently, the issue of obtaining cement from technogenic, by-products of industrial production or secondary mineral resources has become relevant. When introducing a new technology for sulfuric acid decomposition of solid waste from aluminum production in order to obtain secondary alumina and fluorine salts, a large amount of calcium sulfate-containing residue as tailings is formed. The use of these residues in cement production is not only an economically viable technology, but also a method for solving environmental problems that arise when storing aluminum production waste. The main goal of the study is to reduce the cost of producing cement clinker by reducing the amount of expensive additives and the use of SKO, as well as increasing the activity of clinker and obtaining expansive cement. The proposed composition of clinker and the method of producing cement based on it differ from the known one in that the raw material mixture is made up of 3 components and CKO waste is used as an active mineralizer. It has been established that during physical and mechanical testing, the resulting Portland cement is characterized by fairly high strength characteristics both in compression and in bending after 30 days.

Key words: cement, clinker, research, production, production, waste, SKO - waste, raw material mixture, expanding cement, compression, bending.

 

Information about the author:  Rajabov Shukhrat Kholmurodovich – Tajik National University, candidate of technical sciences, associate professor of the department of chemical production technology. Address: 734025, Dushanbe, Republic of Tajikistan, Rudaki Avenue, 17. Phone: (+992) 555-22-11-85. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

 

Article received 26.11.2023

Approved after review 30.01.2024

Accepted for publication 08.04.2024

   
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