Coal-series kaolin gas suspension calcination method

A coal-measure kaolin, suspension calcination technology, applied in chemical instruments and methods, climate sustainability, sustainable manufacturing/processing, etc., can solve the problems of small adjustment range of material residence time, large equipment investment, long firing time, etc. , to achieve the effect of small fluctuation range of calcination temperature, good gas-solid heat and mass transfer, and stable product quality
CN102795633AInactive Publication Date: 2012-11-28BEIJING GENERAL RES INST OF MINING & METALLURGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING GENERAL RES INST OF MINING & METALLURGY
Publication Date
2012-11-28
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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