Wyniki wyszukiwania - BazTech

1

Possible use of selected types of fly ash in the technology of caving goaf sealing

Pierzyna Piotr

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

|

2024

|

nr 77 (149)

63--68

EN

This article presents selected properties of mixtures produced from two types of fly ashes from one coal-fired power plant. Mixtures made of fly ashes from a conventional boiler without flue gas desulfurization products (10 01 02) and from a fluidized bed boiler with flue gas desulfurization products (10 01 82) are subjected to testing. The mixtures are prepared using mine water. The tested mixtures are characterized by a liquid consistency in terms of flowability in a range from 160 mm to 280 mm. The mixtures made of 10 01 82 ashes show twice as much water demand, shorter setting time, and higher strength than those made of 10 01 02 ashes, but, unfortunately, they have a much higher volume of excess water. Moreover, the mixtures of 10 01 82 ash do not undergo full slaking, in contrast to the mixtures of 10 01 02 ash (conventional boiler). The requirements of the PN-G 11011:1998 standard, relative to the discussed parameters, are met by the mixtures made on the basis of ash 10 01 82 originating from a fluidized bed boiler in terms of flowability of up to 240 mm. This is the ash type useable in sealing technology.

2

Możliwość wykorzystania w górnictwie ubocznego produktu spalania pochodzącego z energetyki stosującej węgiel brunatny

Pierzyna Piotr

Rynek Energii

|

2022

|

Nr 2

54--60

PL

W artykule przedstawiono możliwość wykorzystania w technologiach górnictwa podziemnego ubocznego produktu spalania węgla brunatnego pochodzącego z energetyki zawodowej – popiołu lotnego wapiennego. Na bazie przedmiotowego UPS-u wytworzono hydro mieszaniny popiołowo-cementowe, które poddano badaniom wg normy PN-G 1101:1998, która funkcjonuje w górnictwie, a która odnosi się do technologii podsadzania i wypełniania różnego rodzaju wyrobisk podziemnych. Udział masowy cementu w mieszaninie z popiołem wynosił 3, 6 i 9%. Wielkość wody zarobowej (wskaźnik W/S) dobrano tak, aby powstałe mieszaniny miały przede wszystkim konsystencję płynną, ponieważ wytwarzane są w instalacjach powierzchniowych, skąd za pomocą rurociągu w sposób grawitacyjny transportowane są do miejsca ich aplikacji w podziemnych wyrobiskach górniczych. Odnosząc uzyskane wyniki badań do wymagań normy PN-G 11011:1998 należy stwierdzić, że generalnie wszystkie badane mieszaniny ją spełniają, z wyjątkiem tych które nie mają konsystencji płynnej, a więc mieszanin o wskaźniku W/S większym od 1,0 z udziałem cementu większym niż 3%.

EN

The paper presents the possibility of using in underground mining technologies a by-product of lignite combustion that comes from the utility power industry - lime fly ash. Based on the UPS in question, hydro-ashcement mixtures were produced, which were tested according to the PN-G 1101:1998 standard, which is used in the mining industry and refers to the technology of backfilling and filling various types of underground workings. The mass proportion of cement in the mixture with ash was 3, 6 and 9%. The size of the mixing water (W/S ratio) was selected so that the mixtures would be primarily of liquid consistency, as they are produced in surface installations from where they are gravitationally transported by pipeline to the place of their application in underground mine workings. Relating the test results to the requirements of PN-G 11011:1998 standard, it should be stated that in general all the tested mixtures comply with the standard, except for those that do not have the fluid consistency, i.e. mixtures with W/S ratio greater than 1.0 and cement content greater than 3%.

3

Backfill of a Mined-Out Gold Ore Deposit with the Cemented Rubber-Cord and Waste Rock Paste: Environmental Changes in Aqueous Media

Danilov Alexander, Korelskiy Denis, Matveeva Vera, Horttanainen Mika

Journal of Ecological Engineering

|

2021

|

Vol. 22, nr 7

190--203

EN

Assessment of the dynamics of changes in the physical and chemical properties and morphological composition of the filling mixture as well as the identification of the elements capable of migrating into the environment is an important part of assessing the environmental efficiency of such an environmental measure during the filling of mined-out space of an ore deposit. During scientific research, the environmental safety mined-out space filling technology at the gold ore deposit by the mixture of rock waste, cement and crushed car tires was investigated. The authors carried out a set of laboratory studies and created a physical model of groundwater infiltration. Under laboratory conditions, this model allowed the experiment to evaluate the migration of elements and substances from the filling mixture into the environment to assess the risks of secondary pollution. The potential hazard of element migration from the backfill mixture into the environment was determined as a result of testing the backfill mixture on a bench with washing using the model solution that emits drainage water. During research, it was revealed that under the conditions of an ore deposit, the filling mixture components transformation would not lead to hazardous hydrochemical and hydrogeochemical areas or pollution stream formation.