Effect of high temperature on immobilization of heavy metals in concrete with an addition of galvanic sludge

Król, Anna

doi:10.2495/wm080351

Cited by 3 publications

(1 citation statement)

References 3 publications

(5 reference statements)

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“…Given this, there is a need to develop reliable methods for processing galvanic waste. Known methods of neutralization of hydroxide sludge are associated with their use as additives in the production of various materials: concrete [5], expanded clay [6], asphalt [7], Portland cement [8], bricks and ceramics [9]. It is also possible to produce pigments and catalysts from them [10].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of technology of utilization of products of ferritization processing of galvanic waste in the composition of alkaline cements

Kochetov

Kovalchuk

Samchenko

2020

EEJET

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A study of the products of ferritization processing of galvanic waste: sludge and spent process solutions is carried out. As a result of experiments on dynamic leaching of heavy metal ions, the immobilization properties of the sludge, obtained at different process parameters of ferritization are determined. It is shown that the level of immobilization of heavy metals in ferrite sludge after leaching is 99.96 wt % and in the sludge of traditional wastewater neutralization <97.83 wt %. The studies determine the possibility of reliable utilization of ferritized galvanic waste-introduction into the charge to produce alkaline cements. It is found that the main crystalline phases in the structure of alkaline cements with ferrite sludge are calcite, quartz and heavy metal ferrites. In addition, jelly-like formations are found, which are further capable of crystallization. Such formations reliably bind heavy metals in the chemical structure of cement. It is found that when using up to 10 wt % of ferrite sludge in the total weight of cement, the compressive strength of artificial stone reaches 40 MPa, which meets the requirements of the current standard. The chemical stability of the alkali cement matrix using ferrite sludge is confirmed by the study of leaching of heavy metals for one day in neutral, alkaline and acidic media. It is shown that the degree of immobilization of heavy metal ions in cement with a ferrite sludge content of 30 wt % is >99.98 %. In addition, the concentrations of heavy metal ions during leaching meet the national and international standards for their MPC in drinking water and soil. This approach will allow solving the problem of utilization of hazardous galvanic waste and production of general construction materials

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of technology of utilization of products of ferritization processing of galvanic waste in the composition of alkaline cements

Kochetov

Kovalchuk

Samchenko

2020

EEJET

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Еnergy-saving technology for processing of galvanic sludge with obtaining of radio-absorbing materials

Samchenko¹,

Kochetov²,

Vasiliev³

2020

esanr

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The prospective for increasing of environmental safety level of industrial enterprises is considered as result of realization of energy- and resource saving technology for processing galvanic sludge by hydrophase ferritisation method. The possibility of obtaining Ni-Cu-Zn ferrites by processing of galvanic sludge based on of ferritization technology has been studied. Influence of different technological parameters and activation methods of the ferritisation process: thermal and electromagnetic pulse at temperatures of 75°С and 20°С, respectively, on qualitative and quantitative phase content of ferrite sediments has been experimentally determined. The method of electromagnetic pulse activation provides the appropriate degree of heavy metal ions extraction – 99.96%, and also has undeniable energy advantages over thermal, since energy consumption is reduced more than 60%. The efficiency of electromagnetic pulse discharges with magnetic induction amplitude of 0.298 T and a pulse frequency from 0.5 to 10 Hz to obtain environmentally friendly ferrite precipitates has been confirmed. The use of Ni-Cu-Zn ferrite powder for production of coatings that shield the electromagnetic rays in the ultrahigh frequency range is proposed. Obtained sediments have maximum content of crystalline ferromagnetic phases of ferrites – more than 93%. The proposed resource-saving ferritisation process prevents environmental pollution, ensures efficient and rational use of raw materials and energy in industry, as well as allows to obtain marketable products from industrial waste.

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Leaching of Non-Ferrous Metals from Galvanic Sludges

Makovskaya

Kostromin

2019

MSF

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The problem of processing slimes of galvanic production, formed as a result of neutralization of technological solutions and wastewater containing heavy non-ferrous metals is considered. At present, sludges are transported to disposal area and are not used in any way. Typically, such sludges contain significant amounts of chromium and nickel, which creates environmental hazard. Investigated sludge of Dimitrovgrad Automobile Units Plant (Russia) contains up to 6.6% Ni and up to 7,4% Cr. The hydrometallurgical process is proposed to treatment of these sludges. Solutions of sulfuric acid, ammoniaс chloride and Trilon B were used as lixiviants. It is shown that when using a solution of sulfuric acid with pH=1,5, extraction of up to 93,3% Cu, 70,2 Ni, 90,3 Zn is achieved.

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Effect of high temperature on immobilization of heavy metals in concrete with an addition of galvanic sludge

Cited by 3 publications

References 3 publications

Development of technology of utilization of products of ferritization processing of galvanic waste in the composition of alkaline cements

Development of technology of utilization of products of ferritization processing of galvanic waste in the composition of alkaline cements

Еnergy-saving technology for processing of galvanic sludge with obtaining of radio-absorbing materials

Leaching of Non-Ferrous Metals from Galvanic Sludges

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