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Novel technique for producing large-particle high-grade soft leonite from potassium mixed salt by hot crystallization

A technology of strontite and potassium mixed salt, applied in the preparation of bisulfate and other directions, can solve problems such as many impurities, and achieve the effects of simple process, large particle size and good quality

Inactive Publication Date: 2008-07-30
潘向东 +1
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Problems solved by technology

[0004] But the lenbeinite obtained by all existing methods is a fine powder product, the particle size is generally 0.1mm, the grade is generally not more than 98%, and there are many impurities

Method used

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  • Novel technique for producing large-particle high-grade soft leonite from potassium mixed salt by hot crystallization

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Embodiment Construction

[0013] 1000g of potassium mixed salt prepared by drying brine in a salt lake contains 16% sodium chloride, 12% magnesium chloride, 8% magnesium sulfate, 32% langbeinite, 30% water, and the total mass component is 98%. After adding the washing mother liquor obtained in the previous reaction process for pulping, pulverize to below 80 mesh, separate the solid and liquid, discard the excess mother liquor, and wash the potassium mixed salt with the solid to contain 7% of magnesium chloride; add sodium salt washing water to the solid, And add a certain amount of hot water, stir for a certain period of time, separate the solid and liquid, and use the mother liquor as the next pulverized raw material to adjust the slurry. The solid material is coarse langbeinite with a sodium content of 20%. Mix the mother liquor, heat to 75-90°C, the insoluble matter is sodium salt, separate the solid from the liquid by pouring, add 30g of compound growth agent to the hot mother liquor, cool down to 2...

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Abstract

The invention relates to method for extracting schoenite of high purity from the raw material such as potassium magnesium sulfate subtype brine, sea salt bitter brine, lake salt, well salt brine, belonging to the salt chemistry industry, characterized in that potassium mixed with salt is wetly ground and crushed to remove the free magnesium chloride; potassium compound is discomposed by adding water; the magnesium chloride is dissolved and removed to obtain crude schoenite with sodium; the thermosol recrystallizing method is adopted to obtain large particle schoenite and at the same time separate sodium salt under the condition that compound growth substance and denaturant are added,. The novel process adopts the crystallization method to remove magnesium chloride in liquid phase and sieve the sodium salt in solid phase; developing a new conception for preparing the schoenite from the potassium mixed salt. Recycling rate of the potassium is higher than that of all kings of methods known at present and product grade can reach 99.5 percent with the best product quality in the world; the prepared large particle schoenite with high purity can be used as the raw material for producing potassium sulfate with high purity.

Description

1. Technical field [0001] The invention belongs to the technical field of salt chemical industry, and in particular relates to a method for preparing high-grade and large-sized langbeinite by using potassium mixed salt prepared by sun-drying subtype brine containing potassium-containing magnesium sulfate. It is suitable for producing high-purity langbeinite from raw materials such as potassium-containing magnesium sulfate subtype brine, sea salt bittern, lake salt and well salt brine. 2. Background technology [0002] Potassium mixed salt obtained from potassium-containing magnesium sulfate subtype brine through sun drying, mainly composed of potassium halite, carnallite, kabeinite, kaleinite, halite, epsomite and other minerals mixture. [0003] There are many methods for producing langbeinite from sulfate-type salt lake brine, but the industrialized ones mainly include the following types: (1) Flotation method: use flotation reagents to remove sodium chloride, or use levo...

Claims

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Application Information

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IPC IPC(8): C01D5/12
Inventor 潘向东李正华
Owner 潘向东
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