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О роли гидрокарбоалюминатов кальция в усовершенствовании технологии комплексной переработки нефелинов

About the role of hydrafed calcium carboaluminates in improving the technology of complex processing of nephelines
Authors: V. N. Brichkin; Viktor M. Sizyakov;

О роли гидрокарбоалюминатов кальция в усовершенствовании технологии комплексной переработки нефелинов

Abstract

The scientific justification and development of the method for industrial synthesis of complex aluminates of alkaline earth metals is an innovative solution that determined several directions in the development of technology for complex processing of nepheline raw materials. It ensures the production of high-quality metallurgical alumina, the effective utilization of nepheline sludge and production of new types of multipurpose by-products. The modern development of these technical solutions is associated with ensuring the energy efficiency of the synthesis of hydrafed calcium carboaluminates (HCCA) and increasing the level of purification of aluminate solutions. The conditions for synthesizing HCCA with the use of calcareous materials of natural and technogenic origin have been experimentally determined, which makes it possible to isolate the average particle diameter as one of the determining factors of this process. The effect of the turnover of the hydrogarnet sludge on the removal of kinetic limitations in the process of deep desalination of aluminous solutions is theoretically justified. The conditions of a two-stage dosage of HCCA are experimentally determined. It is shown that the optimum ratio of the amount of the reagent supplied in the first and second stages is about 3: 2. At the same time, the maximum degree of precipitation of silica provides the production of aluminate solutions with a silicon module at the level of 95,000, which is achieved by using a HCCA synthesized based on chemically precipitated calcium carbonate in the processing of wastes from the production of mineral fertilizers.

Научное обоснование и разработка способа промышленного синтеза сложных алюминатов щелочно-земельных металлов представляет собой инновационное решение, определившее целый ряд направлений в развитии технологии комплексной переработки нефелинового сырья. Это обеспечивает получение высококачественного металлургического глинозема, эффективную утилизацию нефелинового шлама и выпуск новых видов попутной продукции широкого назначения. Современное развитие этих технических решений связано с обеспечением энергоэффективности синтеза гидрокарбоалюминатов кальция (ГКАК) и увеличением глубины очистки алюминатных растворов. Экспериментально определены условия синтеза ГКАК с использованием известковых материалов природного и техногенного происхождения, что позволяет выделить средний диаметр частиц в качестве одного из определяющих факторов этого процесса. Теоретически обосновано влияние оборота гидрогранатового шлама на снятие кинетических ограничений в процессе глубокого обескремнивания алюминатных растворов. Экспериментально определены условия двухстадийной дозировки ГКАК. Показано, что оптимальное соотношение количества реагента, подаваемого на первой и второй стадии, составляет около 3:2. При этом максимальная степень осаждения кремнезема обеспечивает получение алюминатных растворов с кремниевым модулем на уровне 95000, что достигается при использовании ГКАК, синтезированного на основе химически осажденного карбоната кальция при переработке отходов производства минеральных удобрений.

№231(3) (2018)

Related Organizations
Keywords

Portland cement, deep desilicination, experimental study, карбонат кальция, complex aluminates, глубокое обескремнивание, синтез реагентов, calcium carbonate, energy efficiency, regimes and indices, Mining engineering. Metallurgy, экспериментальное исследование, TN1-997, режимы и показатели, портландцемент, directions of use, энергоэффективность, сложные алюминаты, направления использования, synthesis of reagents

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    4
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Top 10%
Average
Average
gold