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1

The effectiveness of modified sodium bicarbonate in the purification of exhaust gases from HCl and HF

Wysocki D., Szymanek A.

Journal of Achievements in Materials and Manufacturing Engineering

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2022

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Vol. 114, nr 2

57--66

EN

Purpose: The effectiveness of gas purification depends on the sorption properties of sorbents. The aim of the research was to determine the ability of sodium sorbents to remove gaseous pollutants such as HCl and HF. Design/methodology/approach: The research used baking soda subjected to mechanical and thermal activation, which was introduced into the hot flue gas circuit, similar to the dry flue gas cleaning method used in all kinds of boilers. Findings: In almost all cases, mechanical and thermal treatment of baking soda allowed for a significant improvement in the reduction of hydrogen chloride and hydrogen fluoride concentrations in the exhaust gases produced during the combustion of polyethylene terephthalate (PET) bottles. Research limitations/implications: The preparation of sorbents must consider the optimum development of the material's specific surface area, especially during thermal activation, to prevent pores from sintering. Practical implications: In wet and dry flue gas cleaning processes, sodium compounds are used in the power industry. Appropriate preparation of the sorbent allows for improving the effectiveness of reducing the concentration of harmful substances and reducing investment and operating costs. Originality/value: From the point of view of process optimisation, the results obtained will contribute to the identification of optimal operating conditions in dry sorbent injection systems to prevent the pores on the surface of the sorbent from clogging when injected into hot flue gases.

2

Non-Ferrous Metal Sorbents Based on Waste and Side Products of Mineral Benefication Plants

Minenko Vladimir, Denisova Julia, Samusev Andrey, Makarov Dmitry

Inżynieria Mineralna

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2019

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R. 21, nr 1

99--104

EN

The saponite-containing product from the stage of process water clearing at benefication plant of the PAO Severalmaz was thickened using the electrochemical separation for use as sorbent of nickel and copper ions. The product features a high sorption capacity relatively the nickel and copper ions. It has been established that the sorption capacity can be enhanced by roasting the product at 750°С to 194 and 212 mg/g for the nickel and copper ions respectively. An organomineral sorbent for nickel ions based on copper-nickel ore tailings of the JSC „The Kolskaya Mining and Metallurgical Company”, thermally activated at 700ºС, has been synthesized. The surface modification was performed by using the non-covalent immobilization of dimethylglyoxime.

PL

Produkt zawierający saponit z etapu oczyszczania wody technologicznej w zakładzie wzbogacania PAO Severalmaz został zagęszczony przy użyciu rozdzielania elektrochemicznego w celu zastosowania jako sorbent jonów niklu i miedzi. Produkt cechuje się dużą pojemnością sorpcyjną, w stosunku do jonów niklu i miedzi. Ustalono, że pojemność sorpcyjna może być zwiększona przez prażenie produktu w temperaturze 750°C do 194 i 212 mg/g odpowiednio dla jonów niklu i miedzi. Zsyntetyzowano organo-mineralny sorbent dla jonów niklu oparty na odpadach z wzbogacania rud miedzi i niklu JSC „The Kolskaya Mining and Metalurgical Company”, aktywowany termicznie w 700ºС. Modyfikację powierzchni przeprowadzono stosując niekowalencyjną immobilizację dimetyloglioksymem.

3

Heterogeneity of mechanical properties and fractures of Co-based metallic glass in a low-temperature thermal activation process

Griner S., Spilka M., Kania A.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 66, nr 2

53--60

EN

Purpose: The paper presents the changes of mechanical properties and the fractures of Co70.5Fe2.5Mn2Mo1Si9B15 metallic glass ribbons after a low-temperature activation process. Design/methodology/approach: The studied alloy was fabricated by continuous casting of the alloy stream on a turning wheel. The plastic properties were determined using the bend test. The investigations of unit cracking energy using the “tearing” test on the testing machine were carried out. The structure testing in transmission electron microscope and the static tensile test on the Instron testing machine were also carried out. Findings: The studies for 5 samples and for 2 ribbon sides were carried out. The highest plasticity occurred after annealing at 200°C for 1 h. The differences of mechanical properties in a function of a cross section of the ribbon were also presented. Practical implications: Despite the occurrence of heterogeneity of properties on the thickness of metallic glass ribbon the essential meaning have the averaging properties of a product which decided about possibility of practical application. Originality/value: In the article there was found that studied samples obtain different plasticity and different value of the yield point in the different bending methods.