Multi-stage clay calcination process for controlling product color: Fid-Bau Portal

Multi-stage clay calcination process for controlling product color

FESS MARC

The invention relates to a method for heat-treating clay, comprising the following steps: preheating clay suspended in a carrier gas in a heat exchanger (150); heat treating the clay in a calcining stage (160) operating under chemically oxidizing conditions; followed by heat treatment of the clay in a calcining stage (170) operating under chemically reducing conditions; cooling the clay in a cooling stage (180) operating under chemically reducing conditions; the clay is cooled in a cooling stage (190) operating under chemical oxidation conditions. The alternating order of redox potentials of the environment causes black to gray products rather than reddish brown products while reducing harmful gas emissions. Such a guided method can be operated stably.

本发明涉及一种用于热处理粘土的方法，具有如下步骤：在换热器(150)中预加热在载气中悬浮的粘土；在化学氧化条件下运行的煅烧级(160)中热处理粘土；随后在化学还原条件下运行的煅烧级(170)中热处理粘土；在化学还原条件下运行的冷却级(180)中冷却粘土；在化学氧化条件下运行的冷却级(190)中冷却粘土。环境的氧化还原电位的交替的次序在有害气体排放少的同时引起黑色的至灰色的产物而不是红棕色产物。这样引导的方法能够稳定地运行。

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