Preparation system and preparation method of high-activity metakaolin finished product with controllable color

Abstract

The invention discloses a preparation system and a preparation method of a high-activity metakaolin finished product with controllable color. The preparation system comprises a suspension preheating system, a calcining furnace system, a first cooling system and a second cooling system, the calcining furnace system comprises a preheating furnace and a modification furnace, a top outlet of the preheating furnace is connected with a bottom inlet of the modification furnace, and a reduction area is arranged in the modification furnace; an oxidizing furnace system is arranged between an air outlet of a lowermost-stage cyclone preheater and an inlet of a penultimate-stage cyclone preheater of the suspension preheating system, and an oxidizing area is arranged in an oxidizing furnace; and a discharge port of the lowermost-stage cyclone preheater is connected with a material inlet of the first cooling system, the oxygen concentration of a cooling medium of the first cooling system is 4% or less, the first cooling system is used for cooling materials to 200-350 DEG C, and a material outlet of the first cooling system is connected with a material inlet of the second cooling system. The metakaolin which meets the color control requirement can be produced, and the problems that a preparation system is high in energy consumption and small in processing capacity, and the product quality is difficult to control are solved.

Description

technical field [0001] The invention relates to the technical field of metakaolin, in particular to a preparation system and method for highly active metakaolin with controllable finished color. Background technique [0002] Mixed materials are common raw materials for cement and concrete, mainly traditional industrial solid wastes such as finely ground slag and fly ash, which are limited by the quality of these industrial wastes and the inability to obtain them at close distances, or the amount of alternative clinker is not enough. High or large dosage will significantly reduce the cement strength. [0003] Kaolin (Al 2 o 3 2SiO2 2 2H 2 O, AS 2 h 2 ) is a common mineral in natural clay or clay tailings, which can be dehydrated at an appropriate temperature (600-900°C) to generate metakaolin (MK for short). Kaolin belongs to layered silicate structure, and the layers are combined by van der Waals bonds, and the OH-hydroxyl groups are firmly bonded in it. When kaolin ...

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Problems solved by technology

[0008] In order to solve the problems existing in the prior art, the present invention provides a high-activity metakaolin preparation system and preparation method with controllable color of the finished product. The preparation system and preparation method fully consider the control requirements of the concrete and cement industry on the color of metakaolin finished products , can produce metakaolin that meets the color control requirements, and at the same time solve the problems of high energy consumption, small processing capacity, and difficult control of product quality in the metakaolin preparation system

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