Soil characterisation used in ceramic industries and an analysis of its feasibility in ecological bricks

Ambiente Construído Pub Date : 2021-08-02 DOI:10.1590/S1678-86212021000400561

A. Queiroz, C. Morais

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Abstract

Abstract In this study, we aimed to characterise soils of three sedimentary deposits used as raw material sources for ceramic industries located in the Brazilian semi-arid region. The samples were collected in deposits located in the cities of Barra de Sao Miguel, Juazeirinho and Santa Cecilia. They were named, prepared and submitted to tests to determine the mineralogical, chemical, physical and thermal characteristics using the XRD, EDX, Casagrande, granulometric analysis, TG and DTA. The soils presented compositions containing quartz, alumina and hematite, predominantly with about 90% of the total, with well-defined peaks in the diffractograms confirming the statement, and averages of plasticity and granulometric distribution that fit them as silt-clay. When heated to 1000 °C, fire losses were 17%, 16% and 29% for samples from Barra de Sao Miguel, Juazeirinho and Santa Cecilia, respectively, which is due to the dehydration and burning of organic matter. Thus, they have met the requirements of the Brazilian standards that deal to produce sealing (with sintering) and soil-cement bricks (by pressing). The studied deposits offer satisfactory raw material for the ceramics industry and can provide soil for soil-cement brick (ecological bricks) production.

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陶瓷工业土壤特性及其在生态砖中的可行性分析

摘要在这项研究中，我们的目的是表征三种沉积沉积物的土壤，这些沉积物被用作巴西半干旱地区陶瓷工业的原料来源。这些样本是在巴拉德圣米格尔、华泽里尼奥和圣塞西莉亚等城市的沉积物中收集的。它们被命名、制备并提交测试，使用XRD、EDX、Casagrande、粒度分析、TG和DTA来确定矿物学、化学、物理和热特性。这些土壤中含有石英、氧化铝和赤铁矿的成分，占总量的90%左右，其衍射图上清晰的峰证实了这一观点，其塑性和粒度分布的平均值也符合粉质粘土的特征。当加热到1000°C时，Barra de Sao Miguel, Juazeirinho和Santa Cecilia样品的火灾损失分别为17%，16%和29%，这是由于有机物的脱水和燃烧。因此，他们符合巴西标准的要求，处理生产密封(烧结)和水泥土砖(压制)。所研究的沉积物为陶瓷工业提供了满意的原料，并可为生产水泥土砖(生态砖)提供土壤。

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Ambiente Construído

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