Kiln

A high-temperature, thermally insulated chamber engineered for pyroprocessing: transforming raw materials like clay, limestone, and ores into durable products via calcination and sintering.

The kiln is a foundational thermal technology, a specialized oven that drives permanent chemical and physical changes in nonmetallic solids. Its history dates back millennia: Chinese kilns, for example, achieved firing temperatures of 1,000 °C before 2000 BCE. Modern industrial applications are critical, utilizing configurations like rotary kilns for cement production, where limestone is calcined, and tunnel or shuttle kilns for ceramics and refractories. These systems operate at extreme heat (often over 1,400 °C for cement clinker) and, while essential for materials like Portland cement and advanced ceramics, they are energy-intensive, frequently accounting for 55% to 70% of total production costs in the ceramics sector: efficiency is the constant, high-stakes variable.

https://en.wikipedia.org/wiki/Kiln