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The method for preparing potassium chloride and magnesium sulfate by using kainite

A kind of technology of magnesianite and potassium chloride, applied in the direction of magnesium sulfate, alkali metal chloride, etc., can solve the problems that potassium chloride and/or magnesium sulfate have no relevant reports, so as to improve the separation efficiency of nanofiltration and improve the Recycling rate, effect of ensuring high purity

Active Publication Date: 2018-12-04
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no related report on the technology of preparing potassium chloride and / or magnesium sulfate by using kainite

Method used

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  • The method for preparing potassium chloride and magnesium sulfate by using kainite
  • The method for preparing potassium chloride and magnesium sulfate by using kainite
  • The method for preparing potassium chloride and magnesium sulfate by using kainite

Examples

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Embodiment 1

[0032] This embodiment discloses a method for preparing potassium chloride and magnesium sulfate by using magnesia. The method for preparing potassium chloride and magnesium sulfate by using magnesia according to this embodiment includes the following steps:

[0033] S1. Dissolve the potassium magnesia in water to obtain a potassium magnesia solution.

[0034] In the potassium salt magnesia solution, the concentration of KCl is 15g / L~35g / L, MgSO 4 The concentration is 30g / L~60g / L.

[0035] S2, one-stage nanofiltration step: a nanofiltration membrane system is used to perform one-stage nanofiltration treatment on the potassium magnesia solution to obtain one-stage concentrated water and one-stage product water.

[0036] Specifically, the nanofiltration membrane system includes a first nanofiltration membrane module, and a first concentrated water tank and a first produced water tank connected to the first nanofiltration membrane module; the first concentrated water tank is used to store...

Embodiment 2

[0043] This embodiment discloses another preferred method for preparing potassium chloride and magnesium sulfate using potassium magnesia, specifically refer to figure 1 , The device on which it is based includes a dissolution tank 1 and a nanofiltration membrane system connected in sequence; specifically, the nanofiltration membrane system includes a first nanofiltration membrane module 21, a first concentrated water tank connected to the first nanofiltration membrane module 21 ( (Not shown in the figure) and the first produced water tank (not shown in the figure), the second nanofiltration membrane module 22 connected to the first concentrated water tank, and the second concentrated membrane module 22 connected to the second nanofiltration membrane module The water tank (not shown in the figure) and the second produced water tank (not shown in the figure).

[0044] Preferably, the aforementioned nanofiltration membrane system further includes a first booster pump 23 arranged bef...

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Abstract

The invention discloses a method for preparing potassium chloride and magnesium sulfate from kainite. The method comprises the following steps: dissolving the kainite in water to obtain a kainite solution, and performing primary nanofiltration: performing primary nanofiltration treatment on the kainite solution by adopting a nanofiltration membrane system to obtain primary concentrated water and primary producing water, wherein the nanofiltration membrane system comprises a first nanofiltration membrane assembly and a first concentrated water tank and a first producing water tank which are connected to the first nanofiltration membrane assembly, the primary concentrated water is stored in the first primary concentrated water tank, and the primary producing water is stored in the first producing water tank; performing evaporative crystallization on the primary producing water to obtain potassium chloride; performing evaporative crystallization on the primary concentrated water to obtain magnesium sulfate, or performing secondary nanofiltration to obtain secondary concentrated water, and performing evaporative crystallization on the secondary concentrated water to obtain the magnesium sulfate. The invention provides a novel method for producing the potassium chloride and the magnesium sulfate from the kainite serving as a raw material; and furthermore, the method has the advantages of simple process, high product purity and high yield.

Description

Technical field [0001] The invention belongs to the technical field of inorganic salt preparation, and specifically relates to a method for preparing potassium chloride and magnesium sulfate by using potassium magnesia. Background technique [0002] Potassium is one of the three essential nutrient elements (nitrogen, phosphorus, and potassium) for the growth of crops. Among them, potassium chloride is the most important type of potassium fertilizer, accounting for more than 90% of the total amount of potassium fertilizer. China is a country with serious soil potassium deficiency. With the continuous increase in crop yields and the use of nitrogen and phosphate fertilizers, the amount of potassium removed from the soil by crops has gradually increased, and the amount of potassium removed from the soil by the crops is gradually increased. The amount of potassium returned to the soil cannot make up for the amount of crops removed from the soil. The soil potassium is depleted and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08C01F5/40
CPCC01D3/08C01F5/40
Inventor 时历杰王敏杨红军
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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