A system and method for drying carnallite

Abstract

The invention discloses a carnallite sun-drying system. The carnallite sun-dried system includes a carnallite solar pool, a pre-sun solar pool, a mineralization solar pool, and a tailing brine solar pool connected in sequence. The carnallite solar pond is connected, and the carnallite solar pond collects the old brine discharged from the potassium fertilizer production system with a Baume degree between 28‑34.5 for the first drying to form a primary old brine. When the mass fraction of potassium ions is less than 0.02% The primary old brine is introduced into the pre-solarization solar pool for the second drying to form the second old brine. When the Baume degree of the second old brine is 35.5, the second old brine is introduced into the ore-forming solar pool for the third drying. Tail brine is formed, and when the Baumé degree of tail brine is 36.2 to 36.7, the tail brine is introduced into the carnallite solar pool. According to the carnallite sun-drying system and method provided by the present invention, the carnallite can be precipitated quickly through the joint brine of the tail brine and the old brine, and the sun-drying time is greatly shortened. Sulfate ions in the stone can reduce the cost for the subsequent production of magnesium metal.

Description

technical field [0001] The invention relates to the technical field of resource reuse, in particular to a carnallite drying system and method. Background technique [0002] Qinghai is a resource-rich province with a wide variety of natural resources, among which the representative resources are salt lake resources, and the salt lake resources mainly include sedimentary resources and brine resources. Salt lake brine belongs to liquid chloride mineral resources and is rich in various components. Carnallite, which is rich in content, can be processed to produce potassium chloride to produce potassium fertilizer. Potassium fertilizer is one of the three major chemical fertilizers of nitrogen and phosphorus and potassium. Potassium plays a significant role in regulating the life process of plants, which is beneficial to improve the absorption of water in plants. Conditions, synthesis and transfer of sugars, the use of potassium fertilizers can effectively improve the yield and qu...

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Problems solved by technology

[0004] The object of the present invention is to provide a carnallite drying system and method, which is used to solve the long drying time caused by the insufficient supply of existing old brine, and the problem of SO 4 2- high content problem

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