Reactor suitable for sulphur dioxide gas leach manganese dioxide ore

Abstract

The invention discloses a reactor suitable for use in leaching pyrolusite with sulfur dioxide gas. The reactor adopts a main structure that: the inside of a cylinder of the reactor is provided with two stages of absorbing and leaching reaction chambers I, II which are connected serially up and down; two reaction chambers are provided with stirrers respectively; an intake air distribution chamber and an exhaust air collection chamber are arranged above each reaction chamber; a plurality of injection pipes which are communicated with the distribution chambers are arranged under the distributionchambers; the collection chambers arranged above the distribution chambers are communicated with the upper space of the reaction chambers through pipes; the I stage reaction chamber is communicated with the II stage reaction chamber through a downward-flowing connection pipe; the collection chamber of the II stage reaction chamber is communicated with the distribution chamber of the I stage reaction chamber through an upward-flowing connection pipe, wherein the II stage reaction chamber is designed with an oxygen intake connection pipe and an after-reaction slurry discharge connection pipe orifice; and the distribution chambers are designed with a sulfur dioxide gas intake, the I stage reaction chamber is designed with a pyrolusite slurry feeding connection pipe, and the cylinder of the reactor is designed with a tail gas exhaust port. The reactor can realize industrial and continuous production and meet tail gas discharge standards.

Description

technical field [0001] The invention relates to pyrolusite leaching reaction technology, more specifically, relates to a reaction device suitable for leaching pyrolusite with sulfur dioxide gas. Background technique [0002] Manganese sulfate is an important chemical basic product with a wide range of uses. In addition to being used as chemical and metallurgical raw materials, it can also be used in medicine, papermaking, ceramics, catalysts, ore flotation, feed additives, production of electrolytic manganese and other manganese salts. production etc. The traditional manganese sulfate production method is to firstly prepare the manganese sulfate mother liquor, and then filter the manganese sulfate mother liquor, purify and remove impurities, evaporate and crystallize, and dry to obtain the manganese sulfate product. At present, the main methods of producing manganese sulfate mother liquor are: (1) rhodochrosite method: generally need to use rhodochrosite powder with a manga...

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Problems solved by technology

The use of tower equipment for sulfur dioxide leaching of pyrolusite is difficult to achieve industrially, because these absorption towers are liquid film surface absorbers, the gas is the continuous phase, and the liquid is the dispersed phase. The mechanism of action is based on the flow of the liquid. properties and wettability form a liquid film on the surface of the filler, and the gas is absorbed on the surface of the liquid film. Increasing the gas velocity can strengthen gas-liquid absorption, but it has little effect on enhancing the mass transfer at the liquid-solid interface. At the same time, due to the density of ore particles in the liquid Large, it is easy to deposit between the fillers and plates of the absorption tower, especially when the car is parked or stopped in an accident, the deposited pyrolusite will form a piece with the filler, causing serious blockage, making the operation difficult and industrialization impossible; and the mechanical The spray absorber belongs to the droplet surface absorption equipment. Although the external circulation of the slurry system is omitted, for the gas absorption controlled by the gas film, the absorption rate is low and the air velocity is small. After industrialization, the occupied area is too large to be used. accomplish

Chinese patent 97102703.X discloses a special agitator for leaching pyrolusite with sulfur dioxide - an aeration type agitator or a pump with a suction pipe installed. The problems of this equipment are: (1) aeration type agitator or a suction pipe Gas pipe pumps are generally used for oxygenation and aeration in the field of sewage biochemical treatment. The basic principle of gas dispersion is to disperse the gas into the liquid by the shear impact of the liquid. It is required to reach 5-10 (L / L). If the gas-water ratio is too high, the gas will not be able to disperse, which will affect the absorption rate of sulfur dioxide; (2) The volume flow rate of sulfur dioxide gas per unit time that needs to be pumped in industrial production is very large, often as high as several thousand ~ tens of thousands of m 3 / h, while aeration mixers or pumps installed with suction pipes are mainly used in industrial occasions with less volume flow per unit time, generally hundreds of m 3 / h, so it is difficult to apply to large-scale industrial production of sulfur dioxide leaching pyrolusite, which limits the actual industrial application of this method.

According to the chemical reaction rate equation, the concentration of the reactant will significantly affect the chemical reaction rate. Therefore, the operating requirements of the absorption process for the reaction of pure sulfur dioxide gas and pyrolusite pulp are obviously different from those of pyrolusite pulp for absorbing a small amount of sulfur dioxide in flue gas: In the case of a single-stage absorption reaction, due to excessive sulfur dioxide, the absorbed sulfur dioxide gas cannot meet the requirements of environmental protection and discharge standards, which not only wastes sulfur resources, but also pollutes the environment. technical measures

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