Device and method for generating unstable calcium carbonate mineral phase

Abstract

The invention provides a device and a method for generating an unstable calcium carbonate mineral phase. The device consists of a lower reacting area, a middle fluidizing area and a top precipitating area; prepared equimolar Na2CO3 and CaCl2 solutions respectively enter from the two sides of the lower part of a reactor, and are mixed to generate CaCO3 crystals; top backflow is introduced from the bottom at a high flowing speed, which has a certain diluting effect on an inlet aqueous solution, and rising force of the top backflow makes a CaCO3 crystallizing process in a fluidized state; and the generated CaCO3 crystals precipitate in the precipitating area and are separated from the solution, and a reacted solution is discharged from a top water outlet. According to the device and the method for generating the unstable calcium carbonate mineral phase, the generating of CaCO3 stable phase calcite can be inhibited and the generating of unstable phases, such as aragonite and igloite, is promoted through the influence of a backflow effect on the CaCO3 crystallizing process; the problem of scaling of the reactor caused by the generating of the calcite is beneficially solved, and the research of the unstable CaCO3 mineral phase is beneficially development; and compared with other methods, the device and the method have the characteristics of simple operation, low cost, easiness in operation and control and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral synthesis processing engineering, and in particular relates to a device and method for generating an unstable calcium carbonate mineral phase. Background technique [0002] In the field of real life and engineering, most of the heat exchange equipment has different degrees of fouling, which is extremely harmful to the equipment. The annual industrial losses caused by dirt in industrially developed countries account for about 0.3% of their gross national product. my country is a developing country and also a country that consumes a lot of energy. Relatively speaking, the anti-scaling and cleaning technology is backward, and the economic loss caused by dirt will account for a higher proportion of GNP. [0003] CaCO 3 is the main component in dirt and has three different mineral phases, namely calcite, aragonite and aragonite. Calcite is ubiquitous in nature and is the most thermodynamically stabl...

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Problems solved by technology

The former needs to add chemical reagents, the cost is high, and it is easy to cause secondary pollution to the environment; the latter needs to be equipped with optical, electrical, and magnetic related devices, which requires a large investment, and the treatment effect is generally not as good as chemical methods

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