Multi-stage continuous refiner set and application of the multi-stage continuous refiner set in clean preparation of layer-like composite metal hydroxide

Abstract

The invention discloses a multi-stage continuous refiner set and application of the multi-stage continuous refiner set in clean preparation of a layer-like composite metal hydroxide, belonging to the technical field of preparation of inorganic functional materials. According to the invention, a metal hydroxide solution is roughly ground by a sand mill at first and then accurately ground by a secondary colloid mill, and at last the layer-like composite metal hydroxide is prepared after heating, crystallization and drying in a reaction kettle. Based on the basic technique of clean preparation of the layer-like composite metal hydroxide, the crystal chemistry theory is utilized to calculate and analyze hydromechanics to design the multi-stage continuous refiner set; by grinding and preprocessing the raw materials, the grain size of the raw materials can be reduced; the reaction rate can be increased, and in particular appearances of unevenness of the system in the reaction kettle and imbalance of the reaction rate can be effectively avoided when a large-size reaction kettle is adopted for production, so that the grain size of the products is remarkably reduced, the reaction time is greatly shortened from 1-10 days to 0.1-1 day, and the grain size d90 of the products is reduced from less than 10 micrometers to less than 2 micrometers.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of inorganic functional materials, in particular to a multi-stage continuous fine grinding unit and its use in the clean preparation of layered composite metal hydroxides. Background technique: [0002] Layered Double Hydroxides (LDHs for short), also known as hydrotalcite, is a typical anionic layered material, and its chemical composition formula is [M 2+ 1-x m 3+ x (OH) 2 ]A n- x / n mH 2 O, where M 2+ , M 3+ represent divalent and trivalent metal cations, respectively, A n- is an interlayer anion, x is M 3+ The mole fraction of ions, m is the number of crystal water. The element types and composition ratios of the main laminates of LDHs, and the types and quantities of interlayer objects can be adjusted in a wide range according to needs, so as to obtain a series of materials with special structures and properties. [0003] The patent (CN1994888) proposes a clean preparation met...

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Problems solved by technology

Generally, sand mill or colloid mill can be used for pretreatment. The advantage of sand mill is that it has high processing efficiency and can be used in industrial production. The disadvantage is that the raw material can only be ground to 10-20 μm, and the particle size of the obtained product is too large. , the reaction time is long; the advantage of the colloid mill is that the raw material can be ground to below 5 μm, and the particle size of the obtained product is small, which can shorten the reaction time. The disadvantage is that the processing capacity is small and the efficiency is low

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