Coal-series kaolin gas suspension calcination method

Abstract

The invention discloses a coal-series kaolin gas suspension calcination method comprising the following steps of: firstly, crushing and grinding mineral raw materials of coal-series kaolin, feeding the mineral raw materials into a spray drying tower for dehydration, and feeding the materials subjected to spray drying into a furnace external heat exchange decomposition system for treatment; feeding the treated materials into a gas suspension calciner for rapid calcination in an intensive fluidization condition, wherein the fluidizing velocity is 8-40m / s, and the calcination temperature is controlled within 600-1400 DEG C according to the requirements of products; carrying out gas-solid separation on the rapidly calcined materials under the action of whirlwind, then, controlling the proportions of materials returned to the gas suspension calciner through a loop seal, and adjusting the total standing time of the materials in the gas suspension calciner to control the calcination quality of a product; and further carrying out whitening treatment on the calcined materials through a furnace-external reburning heat exchange system, and then, feeding the materials into a product cabin. The method is simple in process, high in heat efficiency, good gas-solid heat and mass transfer and narrow in calcination temperature fluctuation range; and the product is stable and uniform in quality, smoke waste heat can be sufficiently utilized, high handling capacity is realized, and carbon impurities and structural water in the coal-series kaolin can be rapidly removed.

Description

technical field [0001] The invention relates to the technical field of calcination of non-metallic ores, in particular to a method for gaseous suspension calcination of coal series kaolin. Background technique [0002] Coal-series kaolin is an advantageous resource in my country, but it is generally discarded as a kind of industrial waste at present. The natural kaolin storage capacity in my country is about 460 million tons, and the resources have been exhausted for a long time. However, coal-series kaolin resources are very rich, and the future storage capacity is 100 million tons. More than 100 million tons. Coal series kaolin is ground to a certain fineness and calcined. It has high whiteness, easy to disperse and suspend in water, good plasticity and high cohesiveness, excellent electrical insulation performance; and has good acid solubility, very low Physical and chemical properties such as cation exchange capacity and good fire resistance. Kaolin has become a necessa...

AI Technical Summary

Problems solved by technology

At present, the relatively mature technology in China is internal heating rotary kiln calcination, but the heat transfer efficiency of rotary kiln is not high compared with that of fluidized calcination, and the improvement of equipment production capacity is limited, which can only be achieved by increasing the kiln volume, and firing The time is long, the high-temperature flue gas takes away a lot of heat, the energy consumption is large, the adjustment range of the material residence time is small, the huge moving and rotating parts also increase the difficulty of operation and maintenance of the equipment, the equipment investment is large, and the operating cost is high

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