Establishment method and application of goethite method iron precipitation process interface reaction model

Abstract

The invention relates to an establishment method and application of a goethite method iron precipitation process interface reaction model. The method mainly includes: establishing a gas film control mass transfer model, a liquid film control mass transfer model and a solid liquid interface reaction rate model. The invention establishes the goethite method iron precipitation process interface reaction model to analyze and control the main factors affecting chemical rate, and under the premise of guaranteeing goethite grade, has important significance to reasonable utilization of oxygen and calcine.

Description

technical field [0001] The invention relates to a method for establishing an interface reaction model in the iron-precipitation process of goethite method and its application, and belongs to the technical field of automatic control. Background technique [0002] As an important non-ferrous metal raw material, zinc is occupying an increasingly important position in the process of national economic development. The iron precipitation process of goethite method is the last process of direct atmospheric pressure oxygen-enriched zinc leaching process of zinc concentrate, and is one of the key links in leaching production. Its iron removal effect directly affects the subsequent purification and zinc electrolysis process. Usually, the process adopts 5 iron sinking reactors connected in series along the chute in a high and low shape, and oxygen is introduced into the reactors and sand is added to make the iron ions in the solution precipitate in the form of goethite. [0003] The g...

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Problems solved by technology

[0004] Since what takes place inside the reactor is a complex multiphase chemical reaction involving three phases, the process is complex, the conditions are harsh, and the reaction involves mass transfer, interfacial reaction and complex smelting process of fluid mechanics, all of which give the reactor internal control over gas-liquid, Difficulties in the research and analysis of liquid-solid interface characteristics and reaction mechanism

The existing iron precipitation process models are based on macro-scale models of reaction kinetics and material balance, without considering the mesoscopic-scale interface characteristics of chemical reactions, and these models are all based on the ion concentration test values ​​of field workers as input, data There is a large hysteresis, and the gap between the manual experience operation value and the actual demand value increases the difficulty of real-time control of the operation amount and chemical reaction rate of the iron sinking process.

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