Fluidized calcination device and method for treating high-iron low-aluminum coal series kaolinite

Abstract

The invention relates to a fluidized calcination device and method for treating high-iron low-aluminum coal series kaolinite. The device comprises a feed bin, a gas burner, a suspended preheater, a suspended calcination unit, a cyclone separator, an iron removal reductor, an electric magnetic iron remover, a whiteness monitor, a material cooler and a Roots blower. The method comprises the following steps: putting the raw material high-iron low-aluminum coal series kaolinite in the feed bin, preheating the material subjected to primary separation in the suspended preheater, calcining in the suspended calcination unit, and carrying out reduction reaction in the iron removal reductor; and cooling to normal temperature, carrying out magnetic separation in the electric magnetic iron remover to remove magnetic iron minerals, inspecting by the whiteness monitor to obtain the acceptable product, and cooling to normal temperature. The device can efficiently treat high-iron coal series kaolinite, has the advantages of sufficient calcination process and high product whiteness, can effectively remove iron tramp minerals in the raw material, and can easily implement large-size industrial production.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a fluidized calcination device and method for processing high-iron and low-aluminum coal series kaolin. Background technique [0002] Coal-measure kaolin is a solid waste produced during coal mining and washing. It is mainly composed of kaolinite and carbonaceous. Coal-measure kaolin has become a unique kaolin resource in my country; coal-measure kaolin is mainly composed of kaolinite minerals Mainly, followed by a large amount of impurity components such as combustible carbon, organic matter and iron minerals. Coal series kaolin can obtain calcined kaolin with a certain whiteness after dehydration, decarburization, and iron removal. Calcined kaolin is characterized by its unique Its performance is widely used in papermaking, paint, coating, rubber, cable, ceramics and other industries. At the same time, calcined kaolin, as a raw material for some new resourc...

AI Technical Summary

Problems solved by technology

[0003] Iron is the main dyeing factor of kaolin. Iron mostly exists in kaolin in the form of hematite, limonite, siderite, pyrite, ilmenite and other minerals. The above iron minerals will become Fe when calcined at high temperature. 2 o 3 , causing calcined kaolin to turn yellow or brick red, unable to improve its whiteness and other properties; at present, high-iron coal-measure kaolin (TFe>2%) accounts for the majority of coal-measure kaolin in my country, and is limited by the current technology that cannot efficiently remove calcined kaolin Iron minerals make the high-iron coal series kaolin with abundant reserves in my country unable to be effectively utilized

[0004] At present, China's coal series kaolin calcination technology mainly adopts fixed bed tunnel kiln or downdraft kiln, moving bed vertical kiln, and rotary kiln for calcination. The above processes have small production scale, large investment, low output, high energy consumption, and product quality is not easy to control

In addition, there is a fluidized bed calcination technology in its infancy, such as the invention title of CN1915814A "The Fluidized Instant Calcination Technology of Coal Series Kaolin". The material is in contact with high-temperature and high-speed airflow to complete the transient calcination, but the process is transient calcination and does not circulate. The mineral material is a cold material. When it reacts with the high-temperature airflow transiently, due to the short reaction time, the internal reaction of the particles cannot be completely and easily occurs. Insufficient calcination of "blackening" phenomenon, in addition the process can only deal with high raw material whiteness, low-iron coal-based kaolin, can not handle high-iron coal-based kaolin materials; Publication No. CN1600687 title of invention "Ultra-fine kaolin rapid cycle Fluidized calcination process and its equipment", the process is a circulating fluidized calcination, which can achieve the purpose of whitening by repeated calcination, and the calcination process is sufficient; but the process has a long residence time of materials, insufficient heat utilization, and insufficient production Stability and small production capacity, and the process cannot handle high-iron coal series kaolin materials

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