As a result of the economic crisis faced in Brazil, industries in the red ceramic sector have economic problems. The objective of this work was to evaluate, technologically and economically, through analysis of economy, the implementation of the production of ceramic tiles, a material with higher added value than bricks and ceramic blocks, in a ceramic industry located in the state of Rio de Janeiro, Brazil. The ceramic tiles were produced containing the incorporation of ornamental rock waste (ORW). The state has a region that has a red ceramic pole, but produces only products with lower added value. For this, specimens were produced with four different ceramic masses burned at temperatures in the range of 800 to 1050°C. Three masses were produced with different clays from the region (ceramic mass 1, 2 and 3) and a ceramic mass 4 was evaluated containing the clay that presented the best results and with the inclusion of sand and ORW, aiming at the analysis of economy. It was found that the masses containing only clays showed satisfactory parameters of resistance, but showed deficiencies in water absorption. The fourth mass, however, presented acceptable values in all the evaluated properties and was chosen to carry out a full‐scale industrial test, which enabled the development of economic analysis and an economic analysis using the theory of real options. The results obtained in this last stage were also positive, providing an internal rate of return of 16.82%, above the minimum practiced rate of 15%, proving the efficiency of the economy applied to the manufacture of extruded tiles in the industries of the study region.

ResumoBuscar diversificar a oferta de produtos numa empresa é decisão crucial para mantêla no mercado. Diante disso, a produção de telhas cerâmicas extrudadas aparece como uma oportunidade de investimento para uma indústria cerâmica da região de Campos dos Goytacazes/RJ. Com o intuito de auxiliar na decisão por este investimento, este trabalho consiste na formulação de uma massa cerâmica para a produção de telhas. O diagrama de Winkler foi utilizado para direcionar a proporção dos materiais utilizados na formulação das massas. A misturada foi realizada utilizando-se o resíduo de rocha ornamental, areia quartzoza e argila plástica. Para tanto, foram preparados corpos de prova laboratoriais por extrusão e sinterizados em temperaturas de 800, 900 e 1000 °C. Por meio das propriedades investigadas avaliou-se a massa formulada como de melhor desempenho em relação à argila plástica, com resultados adequados às normas técnicas de fabricação de telhas cerâmicas.. Palavras-chave: Incorporação; Reciclagem; Cerâmica vermelha. CERAMIC CLAYEY BODY DEVELOPMENT USING ORNAMENTAL ROCK WASTE AbstractSeeking to diversify the product offering in a company is crucial decision to keep it in the market. Therefore, the production of extruded ceramic tiles appears as an investment opportunity for a ceramic industry in the region of Campos dos Goytacazes -RJ. With the purpose of assisting in the decision for this investment, this work consists in the formulation of a ceramic clayey body for roofing tiles production. The Winkler diagram was used to assist in determining the proportions of each materials used in the clayey body formulation. The formulations was carried out using the ornamental rock residue, quartz sand and plastic clay. For that, laboratory specimens were prepared by extrusion and sintered at temperatures of 800, 900 and 1000 °C. By means of the investigated properties the clayey body formulated presented better performance in relation to the plastic clay, with results adequate to the technical standards of ceramic roofing tiles production..