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Picromerite preparation method based on brine mixing method

A technology of strontium and brine mixing method, applied in the field of comprehensive utilization of salt lake brine, can solve the problems of inability to be reused, waste of land occupation, pollution in the salt lake area, etc. Simple process effect

Inactive Publication Date: 2017-11-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These potassium-containing waste brines cannot be reused, which not only wastes resources, takes up a lot of land, but also pollutes the salt lake area

Method used

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  • Picromerite preparation method based on brine mixing method
  • Picromerite preparation method based on brine mixing method
  • Picromerite preparation method based on brine mixing method

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preparation example Construction

[0022] The invention provides a kind of preparation method based on the lenbeinite of mixing brine method, specifically refer to figure 1 , the preparation method comprises the following steps:

[0023] Step S1, drying the initial brine to obtain low-magnesium and high-potassium sulfate ore.

[0024] Specifically, the initial brine refers to the Na + The mass percentage is 3.0% ~ 5.0%, Mg 2+ The mass percentage is 2.0% ~ 4.5%, K + The mass percentage is 0.5% ~ 1.0%, Cl - The mass percentage of SO is 13.0%~16.0%, SO 4 2- The mass percentage is 3.0%~6.0% salt lake brine, or waste brine or intermediate brine etc. produced in the utilization process of salt lake brine; in the embodiment of the present invention, Keke Salt Lake is preferably produced after producing sodium chloride Discarded brine was used as the initial brine.

[0025] Na + The mass percentage is 18.0% ~ 20.0%, Mg 2+ The mass percentage is 1.5% ~ 4.0%, K + The mass percentage is 5.0% ~ 8.0%, Cl - The ma...

Embodiment 1

[0039] In this example, the initial brine used comes from the waste brine produced after the production of sodium chloride in Keke Salt Lake, and its main ion composition is shown in Table 1.

[0040] Table 1 The main ion composition of the initial brine

[0041]

[0042] After step S1, the main ion composition of the obtained low-magnesium and high-potassium sulfate ore is shown in Table 2.

[0043] Table 2 Main ion composition of low-magnesium and high-potassium sulfate ores

[0044]

[0045] In step S2, the mass ratio of the low-magnesium and high-potassium sulfate ore, the unsaturated magnesium chloride solution, and the second transfer mother liquor is controlled to be 2:1:1, and after mixing the ingredients once, stir for about 15 minutes to remove chlorine by mechanical sieving Sodium chloride; then carry out a transformation at room temperature for 30 minutes, and separate the solid and liquid to obtain a solid low-sodium high-potassium sulfate ore and a mother ...

Embodiment 2

[0056] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between Example 2 and Example 1 is that in step S1, the main ion composition of the initial brine is shown in Table 5.

[0057] The main ion composition of table 5 initial brine

[0058]

[0059] After step S1, the main ion composition of the obtained low-magnesium and high-potassium sulfate ore is shown in Table 6.

[0060] Table 6 The main ion composition of low-magnesium and high-potassium sulfate ore

[0061]

[0062] In step S2, control the mass ratio of low-magnesium and high-potassium sulfate ore, unsaturated magnesium chloride solution, and the second transfer mother liquor to 2.5:1:0.7, and then perform mechanical sieving to remove chlorine after mixing the ingredients for about 10 minutes. Sodium chloride; then carry out a transformation at room temperature for 25 minutes, and sep...

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Abstract

The invention discloses a picromerite preparation method based on a brine mixing method. The picromerite preparation method comprises the following steps: S1, evaporating initial brine in the sun for salt making to obtain low-magnesium and high-potassium sulfate ore; S2, performing primary mixing on the low-magnesium and high-potassium sulfate ore and an unsaturated magnesium chloride solution, performing primary transformation after removal of sodium chloride, and obtaining primary-transformation solid low-sodium and high-potassium sulfate ore after solid-liquid separation; S3, performing secondary mixing on the primary-transformation solid low-sodium and high-potassium sulfate ore and water, performing secondary transformation, and obtaining a wet picromerite filter cake after solid-liquid separation; S4, drying the wet picromerite filter cake to obtain picromerite. According to the method, waste brine or similar-composition brine produced after sodium chloride production based on HohYanhu is taken as the initial brine, the brine resource of complex points in a mirabilite phase area can be used for producing picromerite through one time of brine evaporation for salt making and two times of brine mixing, recycling of potassium and magnesium resources is realized, and salt lake resources are further used comprehensively.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of salt lake brine, and in particular relates to a preparation method of langbeinite based on a brine mixing method. Background technique [0002] my country has abundant salt lake resources, and various potassium salts and lithium salts are separated and extracted from salt lake brine to meet national development and economic needs. Taking the Qinghai-Tibet Plateau region where my country's salt lake resources exist, it is obvious that the composition of salt lake brine in different regions is different, and correspondingly, it is suitable for different preparation processes. [0003] Magnesite (also known as potassium magnesium sulfate fertilizer) is an important potash fertilizer and a raw material for the production of potassium sulfate. The main production area of ​​potassium magnesium sulfate fertilizer in my country is Jinel Salt Lake in Dongxitai, Qinghai. The brine of t...

Claims

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Application Information

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IPC IPC(8): C01D5/12C05D1/02
CPCC01D5/12C05D1/02
Inventor 黄培锦彭时利
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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