Method for preparing large-particle picromerite

A technology of langbeinite and large particles, which is applied in the field of salt chemical industry, can solve the problems of easy agglomeration of dryness and difficult separation of fine particles of langbeinite, and achieves the effects of high yield, low energy consumption and simple principle
CN103420401BActive Publication Date: 2015-04-01HEBEI UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEBEI UNIV OF TECH
Publication Date
2015-04-01

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Abstract

The invention relates to a method for preparing a large-particle picromerite from picromerite crude product. The method comprises the following steps: taking picromerite crude product gained through flotation as raw materials, and through a crystal transformation step of reducing the temperature from 50-70 DEG C to 20-30 DEG C, enabling compound leonite with four crystal water (or langbeinite without crystal water) to be changed into compound picromerite with six crystal water. The particle diameter of the prepared large particle picromerite can reach 620.5 micrometers to the maximal extent, the problem that fine particle picromerite is not easy to separate and dry and easy to agglomerate is solved, and meanwhile the potassium ion recovery ratio in the technology can reach above 80 %.
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Description

technical field

[0001] The invention relates to the preparation of large-grain langbeinite, in particular to a method for preparing large-grain langbeinite by using powdery langbeinite, and belongs to the technical field of salt chemical industry. Background technique

[0002] Kobeinite, molecular formula K 2 Mg(SO 4 ) 2 ·6H 2 O is a multi-component fertilizer and the main raw material for the production of potassium sulfate fertilizer. Compared with traditional potassium sulfate products, potassium magnesium sulfate fertilizer has added magnesium element, which can provide more comprehensive nutrition for crops, so its use has become more and more extensive. It is of great significance to develop a high-efficiency and energy-saving process for producing large-grain lenbeinite. At present, the patents related to the production method of langbeinite mainly include: patents CN87103934A, CN1038252A, CN1038799A, CN1076435A, CN1236734A, CN1724374A, CN101318844A, CN101481265A...

Claims

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