Wyniki wyszukiwania - BazTech

1

Waste Water Purification from Metal Ions by Ultra-Dispersed Natural Sorbents

Yerbolov Sezim, Daumova Gulzhan

Journal of Ecological Engineering

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2022

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Vol. 23, nr 1

43--50

EN

This work is devoted to mine wastewater purification from metal ions, such as copper, zinc, lead, cadmium, iron, and manganese. The rationale was provided for the possibility to purify the wastewater from metal ions with nonactivated and ultra-dispersed natural sorbents. The adsorption capacity of bentonite clay from Tagan deposit and shungite from Koksui deposit of the Republic of Kazakhstan was studied on the basis of its fraction composition. It was found that the most effective method of sorbents modification was mechanical activation. The comparative studies of metal ions adsorption efficiency were carried out with mechanically activated and ultra-dispersed bentonite clay and shungite. The experiment enabled to find out that ultra-dispersed bentonite clay is prospective for use in order to deeply purify multicomponent mine wastewater. The highest degree of metal ions extraction was achieved due to 30-minutes contact of wastewater.

2

Doświadczalne sprawdzenie chłonności pochłaniaczy wilgoci w różnych warunkach klimatycznych

Korzeniowski Janusz

Problemy Techniki Uzbrojenia

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2020

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R. 49, z. 153

87--108

PL

W artykule przedstawiono wyniki badań dostępnych na rynku i aktualnie eksploatowanych pochłaniaczy wilgoci. Doświadczalnie sprawdzono parametry dwóch typów żeli krzemionkowych, glinki bentonitowej i dwóch typów sit molekularnych dostępnych na rynku oraz aktualnie eksploatowanego w sprzęcie uzbrojenia wielokrotnie regenerowanego silikażelu. W ramach pracy określono maksymalną chłonności pochłaniaczy wilgoci dla różnych warunków klimatycznych, minimalny poziom wilgotności względnej (RH) w osuszanej komorze pomiarowej dla różnych ilości absorbentu oraz trwałości wiązania wody w zmiennych warunkach temperaturowych. Analiza otrzymanych wyników pozwoliła porównać rodzaje absorbentów określić ich zalety i wady oraz pozwoliła ocenić stopień zużycia aktualnie eksploatowanego absorbentu wilgoci w sprzęcie uzbrojenia.

EN

The article presents results of tests for moisture absorbers currently used and available on the market. Experimental investigations were carried out for two types of silica gels, the bentonite clay and two types of molecular sieves available on the market, as well as for the reused silica gel currently deployed inweapon systems. As part of the work, the maximum absorbency of moisture absorbers for various climatic conditions, the minimum relative humidity (RH) in the drying measuring chamber for various amounts of absorbent, and the durability of water binding at variable temperature conditions were determined. Analysis of results allowed both to compare advantages and disadvantages of various absorbents, and to assess a degree of the wear for moisture absorbents currently used in armament equipment.

3

The Effect of the Addition of Bentonite Clay to Traditional Sand Mixtures on the Surface Quality of Iron Castings

Kamińska Jadwiga, Puzio Sabina, Angrecki Michał, Stachowicz Mateusz

Journal of Ecological Engineering

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2020

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Vol. 21, nr 1

160--167

EN

Successful casting demands that during pouring of the foundry mould with molten metal the mould cavity suffers no deformation. This, in turn, demands the use of binding materials that can give the base sand adequate strength. The main bonding materials are clay binders. The foundry industry uses minerals rich in clay, such as kaolinite, halloysite, hydromica, montmorillonite, polygorskite, vermiculite and allophane. Due to their binding capacity, montmorillonites are the most interesting minerals of all the plastic clay rocks. The basic clay rock containing montmorillonite, used as a common binding material for traditional foundry sand mixtures, is bentonite. The domestic demand for raw bentonite materials is almost entirely satisfied by imports from Slovakia, Turkey, Italy, Germany and the Czech Republic, in order of import size. In Poland, the bentonite deposits occur in very small quantities. The exploitation of bentonites is carried out only in the Krzeniów deposit, where they constitute a mineral accompanying basalt. Much more common are bentonite clays containing in addition to smectites also a large amount of other clay minerals. The article presents the results of studies of the physico-chemical and mechanical properties of moulding sand mixtures containing pure bentonite, pure clay or hybrid bentonites which are a bentonite-clay mixture. Melting was also carried out to determine the effect of the type of binder on the surface quality of iron castings.

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Effect of Bentonite Clay Addition on the Thermal and Mechanical Properties of Conventional Moulding Sands

Kamińska J., Puzio S., Angrecki M.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 1

111--116

EN

Bentonites and clays are included in the group of drilling fluids materials. The raw materials are mainly clay minerals, which are divided into several groups, like montmorillonite, kaolinite, illite, biotite, muscovite, nontronite, anorthoclase, microcline, sanidine or rutile, differing in chemical composition and crystal lattice structure. Clay minerals have a layered structure forming sheet units. The layers merge into sheets that build up to form the structure of the mineral. The aim of the studies carried out in the ŁUKASIEWICZ Research Network - Foundry Research Institute is to explore the possibility of using minerals coming from Polish deposits. The article outlines the basic properties of hybrid bentonites, which are a mixture of bentonite clay called beidellite, originating from overburden deposits of the Turoszów Mine, and foundry bentonite from one of the Slovak deposits. As part of the physico-chemical tests of minerals, measurements included in the PN-85/H-11003 standard, i.e. montmorillonite content, water content and swelling index, were carried out. Additionally, the loss on ignition and pH chemical reaction were determined. Based on the thermal analysis of raw materials, carried out in the temperature range from 0 to 1000⁰C, changes occurring in these materials during heating, i.e. thermal stability in contact with liquid metal, were determined. Examinations of the sand mixture based on pure clay and bentonite and of the sand mixture based on hybrid bentonites enabled tracing changes in permeability, compressive strength and tensile strength in the transformation zone as well as compactability referred to the clay content in sand mixture. Selected technological and strength parameters of synthetic sands are crucial for the foundry, because they significantly affect the quality of the finished casting. Based on the analysis of the results, the optimal composition of hybrid bentonite was selected.