Evaluation of the Influence of the Waste Originated by the Production of Titanium Dioxide (URM) on the Physical-Mechanical Properties of Coating Mortars

Waste generation is one of the main problems of contemporary society, resulting in high economic costs and environmental impacts, such as the contamination of water sources, groundwater and soil. In this context, there is the unreacted mineral (URM), a waste originated by the production of titanium dioxide, which currently does not have an effective reuse plan, being deposited in a controlled landfill, generating a high economic expense for the generating company. In this way, the present work aims to evaluate the influence of URM on the properties of coating mortars. Firstly, it was carried out a physical, chemical and mineralogical characterization of the waste and, afterwards, coating mortar was prepared with additions of 0% (reference), 5%, 10% and 15% of the waste, in relation to the cement mass. The mortars were evaluated for density, porosity, capillary absorption by capillarity and mechanical strength. It was noted that the waste increased the mechanical strength of the mortars studied and did not significantly influence the other evaluated properties. Therefore, the incorporation of the waste into mortars is an interesting and feasible alternative for the destination of the URM.

Download Full-text

Performance of Precursor Materials and Fired Ceramics for Structural Blocks

Materials Science Forum ◽

10.4028/www.scientific.net/msf.820.13 ◽

2015 ◽

Vol 820 ◽

pp. 13-17

Author(s):

Neila Gondim Azeredo ◽

Euzébio Barnabé Zanelato ◽

Jonas Alexandre ◽

Afonso Rangel Garcez de Azevedo ◽

Gustavo de Castro Xavier ◽

...

Keyword(s):

Building Construction ◽

Structural Ceramic ◽

X Ray Diffraction ◽

Mineralogical Characterization ◽

X Ray ◽

Physical Chemical ◽

Ceramic Blocks ◽

Clay Body ◽

Structural Blocks

The physical, chemical and mineralogical characterization of a precursor clay body before firing is of relevance for understanding the technological performance of the fired clay ceramic. In particular, structural clay ceramic blocks used in building construction need to attend standard properties specified by the norms. In the present work the precursor clay body, typically used to fabricate structural blocks in Campos dos Goytacazes, state of Rio de Janeiro, Brazil, was characterized in terms of particle size distribution, X-ray diffraction, chemical composition and Atterberg limits. In addition, the performance of structural ceramic blocks, fabricated from the extruded clay body and fired at 850oC, was evaluated. The results indicated that the ceramic mechanical strength complies with the Brazilian norm but the water absorption is higher than the maximum specified by the norm. The characteristic of the clay body contribute to justify the structural blocks performance.

Download Full-text

Physical, Chemical and Mineralogical Characterization of Fluorspar Flotation Tailings

Materials Today Proceedings ◽

10.1016/j.matpr.2017.11.086 ◽

2018 ◽

Vol 5 (1) ◽

pp. 302-310 ◽

Cited By ~ 1

Author(s):

Thembelihle Portia Lubisi ◽

Willie Nheta ◽

Freeman Ntuli

Keyword(s):

Mineralogical Characterization ◽

Flotation Tailings ◽

Physical Chemical

Download Full-text

Caracterização do solo em comunidades agrícolas no Município de Sousa para fins de produtividade

Revista Principia - Divulgação Científica e Tecnológica do IFPB ◽

10.18265/1517-03062015v1n48p112-118 ◽

2020 ◽

Vol 1 (48) ◽

pp. 112

Author(s):

Maíre Gomes De Meneses ◽

Denis Patricio Vidal ◽

Hiago Aristides Da Silva ◽

Luís Carlos Dos Santos ◽

Alexsandra Cristina Chaves ◽

...

Keyword(s):

Electrical Conductivity ◽

Diffraction Analysis ◽

Nutrient Deficiency ◽

X Ray Diffraction ◽

Mineralogical Characterization ◽

X Ray ◽

Physical Chemical ◽

Potassium Magnesium

The present work had the objective of performing a physical-chemical and mineralogical characterization of soils collected from three agricultural settlements located in the region of Sousa / PB in order to identify problems for planting and inadequate management in these areas. All the analysis were performed according to Teixeira et al. (2017), except the electrical conductivity analysis, which followed the methodology of Tedesco et al. (1995). Results showed that average and high values of Calcium, Potassium, Magnesium, Sodium and Phosphorus were compared to the literature, which does not characterize a nutrient deficiency of these soils. It was also observed that most of the analyzed soils present an average alkalinity and that all have sodium traces. X-ray diffraction analysis indicated that all soils are composed of quartz, feldspar, mica, smectite and albite.

Download Full-text

Copper Recovery Through Smelter Slag Flotation in Atacama, Chile: An Industrial Case Study

Ingeniería e Investigación ◽

10.15446/ing.investig.v41n1.84162 ◽

2021 ◽

Vol 41 (1) ◽

pp. e84162

Author(s):

Osvaldo Pavez ◽

Pablo Herrera ◽

Miguel González ◽

Oscar Rivera

Keyword(s):

Copper Slag ◽

Copper Smelter ◽

Copper Recovery ◽

Processing Capacity ◽

Industrial Case Study ◽

Mineralogical Characterization ◽

Physical Chemical ◽

Sulfide Ore

Copper slag flotation was studied on an industrial scale at a concentrator plant in the region of Atacama, Chile. This study consisted of the physical, chemical, and mineralogical characterization of the copper slag, along with preliminary flotation tests. This article focuses on industrial flotation, which consisted of two oneyear campaigns (2016 and 2017). The first campaign was carried out using an existing copper slag flotation circuit in the plant. During the second campaign (2017), a circuit for sulfide ore flotation with an additional columnar flotation cleaning stage was evaluated. Results showed an improvement in metallurgical parameters on the second campaign (including improvements in processing capacity, concentrate copper grade, and metallurgical recovery). From the industrial copper slag flotation campaigns, it was concluded that it is possible to obtain a commercialquality copper concentrate, suitable for further processing in a copper smelter. This mitigates certain environmental impacts of copper processing.

Download Full-text

Characterization of Waste from the Production of Titanium Dioxide (UOW) for Reuse in Other Processes

The Journal of Solid Waste Technology and Management ◽

10.5276/jswtm/2021.590 ◽

2021 ◽

Vol 47 (3) ◽

pp. 590-600

Author(s):

José da Silva Andrade Neto ◽

Nilson Santana de Amorim Júnior ◽

Vitor Souza Santos ◽

Bruna Bueno Mariani ◽

Diana Dayse Mariano de Albuquerque ◽

...

Keyword(s):

Titanium Dioxide ◽

Environmental Issues ◽

Ceramic Materials ◽

Raw Material ◽

Industrial Processes ◽

New Materials ◽

Physical Chemical ◽

Expected Performance ◽

Starting Point

The reuse of waste generated in several industrial processes through the development of new materials for civil construction has been shown to be a viable alternative to meet environmental issues. New products can be developed that satisfy the expected performance and durability requirements while including this material. The main starting point for the development of projects that seek the safe use of these wastes is an extensive characterization. Unreacted Ore Waste (UOW), a waste generated during the production of titanium dioxide (TiO2), was characterized in terms of its physical, chemical, mineralogical, environmental, and radiological, as well as thermal properties. There is currently no effective reuse plan for UOW and it is disposed of in industrial landfills. From the characterization, possible routes for using UOW are identified, such as its addition to mortars with photocatalytic potential, and its use as a raw material in the production of Portland cement and ceramic materials.

Download Full-text

Effect of the Addition of Unreacted Ilmenite (UOW) on the Hydration of White Portland Cement - Hydrated Lime Pastes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.803.289 ◽

2019 ◽

Vol 803 ◽

pp. 289-293

Author(s):

José da Silva Andrade Neto ◽

Diana Dayse Mariano de Albuquerque ◽

Nilson Santana Amorim Júnior ◽

Daniel Véras Ribeiro

Keyword(s):

Titanium Dioxide ◽

Portland Cement ◽

Raw Materials ◽

Setting Time ◽

Hydrated Lime ◽

Calcium Sulphate ◽

Mineralogical Characterization ◽

Time Determination ◽

White Portland Cement

This paper evaluates the effect of the incorporation of unreacted ilmenite (UOW), waste from the production of titanium dioxide, on the hydration of white Portland cement – hydrated lime pastes. For this, after the physical and mineralogical characterization of the raw materials, pastes with additions of 5%, 10% and 15% of UOW, in relation to cement weight, besides a reference paste (without UOW), were molded. Tests of setting time determination by Vicat needle and semi-adiabatic calorimetry tests were carried out, as well as thermogravitry analysis of pastes at 7 days of curing. The addition of UOW, due to the presence of anhydrite (calcium sulphate) in its composition, is responsible for delaying the hydration of the white Portland cement – hydrated lime pastes, increasing the setting time and reducing the heat release. Despite the influence in the first hours, the waste did not influence significantly the contents of combined water and portlandite formed in the pastes at 7 days.

Download Full-text