A kind of magnesium sulfate subtype salt lake brine salt field natural evaporation staged mineralization technology

A magnesium sulfate subtype and natural evaporation technology, which is applied in the purification of alkali metal sulfite/sulfate, inorganic fertilizer, agriculture, etc., can solve the problem of large impact on langbeinite production, reduced sulfate content, and increased production costs, etc. problems, to achieve the effect of improving ore-forming efficiency, increasing the ratio of sulfur and potassium, and reducing the loss of brine

Active Publication Date: 2021-10-22
青海中信国安锂业发展有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

This process can meet the requirements of magnesium sulfate subtype brine to produce potassium sulfate, but there is a problem of low efficiency
Due to the setting up of the Epsilon Salt Field in the drying and evaporation process of the salt field, the precipitation of the Epoxy Salt resulted in a decrease in the sulfate content in the brine, and the insufficient sulfur-potassium ratio in the sun-dried potash mixed salt ore had a great impact on the production of langbeinite ; In order to replenish the sulfate radical, the epsom salt that precipitates has to be added into the soft potash conversion section in the conversion process, resulting in increased production costs, which is economically unreasonable

Method used

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  • A kind of magnesium sulfate subtype salt lake brine salt field natural evaporation staged mineralization technology
  • A kind of magnesium sulfate subtype salt lake brine salt field natural evaporation staged mineralization technology
  • A kind of magnesium sulfate subtype salt lake brine salt field natural evaporation staged mineralization technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The raw material is taken from the underground brine brine pumping station in the Xitai Jinaier Salt Lake in Qaidam Basin, Qinghai in January 2018. It has the chemical composition shown in Table 1. From the composition analysis, the hydrochemical type of the brine system belongs to the magnesium sulfate subtype. Potassium ions composed of the brine Jenec J 2K =8.0, Mg Ion Jenec J Mg =68.81, sulfate ion Yenecke J SO4 =23.19, its brine composition point is located at 25℃K + 、Na + , Mg 2+ ∥ Cl - , SO 4 2- -H 2 The Epsom salt region in the metastable phase diagram of the O quinary water-salt system.

[0035] Table 1: Chemical composition of brine from wells in Xitaijinel Salt Lake in January 2018

[0036]

[0037] (1) Take 213.86 liters of brine from a magnesium sulfate subtype salt lake well, and use a plastic basin for natural evaporation to precipitate sodium chloride. + ] to 24.243g·L -1 , [Mg 2+ ] is 67.825g·L -1 , [Cl - ] is 194.580g·L -1 , [SO 4 2...

Embodiment 2

[0044] The raw materials are taken from the brine pumping station in April 2018 in Xitaijiner Salt Lake, Qaidam Basin, Qinghai. It has the chemical composition shown in Table 3. From the composition analysis, the hydrochemical type of the brine system belongs to the magnesium sulfate subtype. Potassium ions composed of the brine Jenec J 2K =7.07, magnesium ion Jenecke J Mg =74.12, sulfate ion Yenecke J SO4 =18.82, its brine composition point is located at 25℃K + 、Na + , Mg 2+ ∥ Cl - , SO 4 2- -H 2The Epsom salt region in the metastable phase diagram of the O quinary water-salt system. Compared with the method provided in Example 1, the main difference between this example is that the selected raw materials have different chemical compositions, and the adaptability of the method under different raw materials is mainly investigated.

[0045] Table 3: Chemical composition of brine from wells in Xitai Jinel Salt Lake in April 2018

[0046]

[0047] (1) Take 46.2 kg of...

Embodiment 3

[0054] The raw material is taken from the underground brine brine pumping station in Xitaijiner Salt Lake, Qaidam Basin, Qinghai in October 2018. It has the chemical composition shown in Table 5. From the composition analysis, the water chemical type of the brine system belongs to the subtype of magnesium sulfate . Potassium ions composed of the brine Jenec J 2K =7.68, magnesium ion Jenecke J Mg =76.26, sulfate ion Yenecke J SO4 =16.07, its brine composition point is located at 25℃K + 、Na + , Mg 2+ ∥ Cl - , SO 4 2- -H 2 The Epsom salt region in the metastable phase diagram of the O quinary water-salt system. Compared with the method provided in Example 2, the main difference between this example is that the selected raw materials have different chemical compositions, and the adaptability of the method under different raw materials is mainly investigated.

[0055] Table 5: Chemical composition of brine from wells in Xitai Jinel Salt Lake in October 2018

[0056]

...

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Abstract

The present invention relates to a sub-type magnesium sulfate subtype salt lake brine natural evaporation staged ore-forming process, comprising the following steps: (1) pumping brine from a magnesium sulfate subtype salt lake well into a sodium salt pool, naturally evaporating to precipitate sodium chloride, and then When the sharp salt is close to saturation, it is introduced into the adjustment pool, and when the brine point reaches the epsom salt and is about to be precipitated, it is imported into the potassium mixed salt pool; (2) in the potassium mixed salt pool, the brine obtained in step (1) continues to be evaporated naturally, and when the brine is close to light brine The stone is saturated and will be imported into the carnallite pool when it is about to be separated out, and the potassium mixed salt ore is separated out, and the potassium mixed salt ore is separated out, and the potassium mixed salt ore enters the potassium magnesium sulfate fertilizer workshop to produce langbeinite products; (3) in the carnallite In the pool, the brine obtained in step (2) continues to be evaporated naturally, and when the brine reaches the old brine point, it is introduced into the old brine storage tank, and carnallite ore is precipitated, and the carnallite ore enters the potassium chloride workshop to produce potassium chloride products . The invention has the advantages of simple process, low production cost and high sulfur-potassium ratio of potassium mixed salt ore.

Description

technical field [0001] The invention relates to the field of inorganic salt chemical industry, in particular to a staged mineralization process of natural evaporation of magnesium sulfate subtype salt lake brine and salt fields. Background technique [0002] According to the chemical composition of salt lake brine, salt lakes can be divided into three types: carbonate, sulfate and chloride. The most common distribution in China is the sulfate-type salt lake, and the number is also the largest. China's sulfate-type salt lake resources are mainly concentrated in Qinghai and Xinjiang, among which sulfate-type magnesium subtype salt lake resources are the main resources. Although the number is small, the area of ​​salt lakes accounts for 1 / 2 of the total area, and the resource reserves are large. An important brine raw material for the production of potassium sulfate. [0003] The technical process of producing potassium sulfate by using sulfate-type salt lake brine is as foll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/06C01D5/16C05D1/02
CPCC01D3/06C01D5/16C01P2006/80C05D1/02
Inventor 李陇岗余明祥秦佳政权彩兄
Owner 青海中信国安锂业发展有限公司
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