Preparation method for potash magnesium sulphate fertilizer, potassium chloride and potassium sulphate
A technology of potassium sulfate and magnesium fertilizer and potassium chloride, which is applied in the fields of alkali metal sulfite/sulfite, chemical instruments and methods, potassium fertilizer, etc., and can solve the problems of low yield of potassium chloride, retention of carnallite, and loss of potassium resources and other issues, to achieve high yield, less stringent process conditions, and reduce the effect of process flow
Active Publication Date: 2020-07-03
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology
In the same way, the yield of potassium chloride produced by its conversion is related to the ratio of sulfate, the higher the sulfate content, the lower the yield of potassium chloride
At the same time, the introduced flotation technology has almost no flotation ability for the carnallite phase, which can easily cause the risk of carnallite staying in the tailings and being abandoned, resulting in the loss of potassium resources
Method used
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[0029] One aspect of the embodiments of the present invention provides a method for preparing potassium magnesium sulfate fertilizer, potassium chloride and potassium sulfate, comprising:
[0030] (1) Carry out flotation treatment to sulfate-type potassium mixed salt ore with anionic flotation agent to obtain potassium-sulfur mixed-salt concentrate and chloride-type tailings, wherein the potassium-sulfur mixed-salt concentrate includes The following components: NaCl 1.0~2.5wt%, KCl 23~28wt%, K 2 SO 4 3~11wt%, MgSO 4 42~47wt%, MgCl 2 0-1.5wt%, the chloride-type tailings include the following components calculated by mass percentage: NaCl 16-76wt%, KCl 6.5-11.0wt%, K 2 SO 4 0.2~0.7wt%, MgSO 4 2.0~5.5wt%, MgCl 2 4.0~32.5wt%;
[0031] (2) Contact the hot solvent with the chloride-type tailings, and perform selective heat-dissolution treatment at 75-100°C, and then separate the obtained mixture from solid-liquid to obtain high-temperature potassium-rich saturated liqui...
Embodiment 1
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Embodiment 2
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[0101]
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The invention discloses a preparation method for a potash magnesium sulphate fertilizer, potassium chloride and potassium sulphate. The method comprises the steps of: carrying out flotation treatmenton sulfate type potassium mixed salt ore with an anionic flotation agent so as to obtain potassium-sulfur mixed salt concentrate and chloride type tailings; then allowing a hot solvent to be in contact with the chloride type tailings for selective hot melting treatment so as to obtain a high-temperature potassium-rich saturated solution, sodium chloride and kieserite; then supplementing fresh water, carrying out stepped closed cooling crystallization treatment on the obtained high-temperature potassium-rich saturated solution at the same time so as to prepare the potassium chloride; meanwhile,evaporating a low-temperature potassium saturated solution obtained by cooling crystallization treatment, and carrying out fresh water decomposition treatment so as to obtain the potassium chloride;and converting the obtained potassium-sulfur mixed salt concentrate, carrying out refining treatment so as to obtain the potash magnesium sulphate fertilizer, and allowing the potash magnesium sulphate fertilizer to react with the obtained potassium chloride and fresh water so as to obtain the potassium sulphate. The preparation method provided by the invention is high in separation efficiency, simple in process condition flow and convenient for technical popularization and implementation.
Description
technical field [0001] The invention belongs to the technical field of inorganic salt industry, and in particular relates to a preparation method of potassium magnesium sulfate fertilizer, potassium chloride and potassium sulfate. Background technique [0002] Potassium fertilizer is the basic material material for the stable growth of grain production. It can effectively improve the quality of agricultural products and improve the stress resistance of crops. It is one of the nutrients necessary for the growth of crops. With the reduction of arable land and the continuous growth of population, large-scale development of potassium resources and improvement of potassium fertilizer yield are of great significance to food security. [0003] Potassium fertilizer product types are mainly potassium chloride fertilizer, accounting for more than 90% of the total potash fertilizer; there are also sulfate type (potassium sulfate, potassium sulfate magnesium fertilizer), nitrate type (p...
Claims
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Login to view more IPC IPC(8): C05D1/02C01D3/08C01D3/14C01D5/00B03D1/018B03D101/02B03D103/02
CPCB03D1/018B03D2201/02B03D2203/02C01D3/08C01D3/14C01D5/00C05D1/02
Inventor 时历杰王敏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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