Method for preparing potassium sulfate

A technology of potassium sulfate and sodium sulfate, which is applied in the preparation of sulfate/bisulfate, can solve the problems of research work staying in the experimental stage and increasing production costs, and achieve the goals of shortening the growth cycle, improving production efficiency, and saving fresh water resources Effect

Inactive Publication Date: 2015-04-01
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Abstract
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Problems solved by technology

The membrane separation method uses sulfuric acid and potassium chloride as raw materials, and uses a membrane distillation reactor to produce potassium sulfate. It has the advantages of low energy consumption and no chlorine in the product. However, because many exchange membranes need to be imported, the production cost is grea...

Method used

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  • Method for preparing potassium sulfate

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Embodiment 1

[0051] 1) Potassium mixed salt ore, potassium chloride, sodium sulfate, the first mother liquor (consist of: 1.9% K + , 7.0% Mg 2+ , 20.1% Cl - , 4.8% SO 4 2- , 0.5% Na + , 68.3% H 2 0), the second mother liquor (high-sodium mother liquor) is mixed in the mass ratio of 9:1.2:5.5:16:13.2 and dropped into a transformation tank, and stirred at a speed of 230~270r / min for 1.0h at room temperature to fully transform the raw materials, React to obtain a solid-liquid mixture;

[0052] 2) Import the solid and liquid mixture obtained in step 1) into the flotation tank, adjust the volume ratio of solid and liquid to 1:4, add flotation reagents for flotation, and then filter and separate the obtained flotation foam to obtain soft Kobeinite and the first mother liquor (such as figure 1 shown in ), the first mother liquor is introduced into the tail salt pond to be evaporated and concentrated, and returned to step 1) for recycling in the first section of the conversion tank, and can...

Embodiment 2

[0057] 1) Potassium mixed salt ore, potassium chloride, sodium sulfate, salt lake brine (salt lake brine is composed of: 1.9% K + , 7.0% Mg 2+ , 20.1% Cl - , 4.8% SO 4 2- , 0.5% Na + , 68.3% H 2 0), the second mother liquor (high-sodium mother liquor) is mixed and dropped into a transformation tank in a mass ratio of 12:1.5:7:20:16.8, and stirred at a speed of 230 to 270r / min for 1.0h at room temperature to fully transform the raw materials, React to obtain a solid-liquid mixture;

[0058] 2) Import the solid and liquid mixture obtained in step 1) into the flotation tank, adjust the volume ratio of solid and liquid to 1:4, add flotation reagents for flotation, and then filter and separate the obtained flotation foam to obtain soft Kobeinite and the first mother liquor (such as figure 1 shown in ), the first mother liquor is introduced into the tailing salt pond to be evaporated and concentrated, and returned to step 1) as the salt lake brine for recycling in the first s...

Embodiment 3

[0063] 1) Potassium mixed salt ore, potassium chloride, sodium sulfate, salt lake brine (salt lake brine is composed of: 1.9% K + , 7.0% Mg 2+ , 20.1% Cl - , 4.8% SO 4 2- , 0.5% Na + , 68.3% H 2 0), the second mother liquor (high-sodium mother liquor) is mixed and dropped into a transformation tank in a mass ratio of 10:1.5:7:18:17.1, and stirred at a speed of 230 to 270r / min for 1.0h at room temperature to fully transform the raw materials, React to obtain a solid-liquid mixture;

[0064] 2) Import the solid and liquid mixture obtained in step 1) into the flotation tank, adjust the volume ratio of solid and liquid to 1:4, add flotation reagents for flotation, and then filter and separate the obtained flotation foam to obtain soft Kobeinite and the first mother liquor (such as figure 1 shown in ), the first mother liquor is introduced into the tailing salt pond to be evaporated and concentrated, and returned to step 1) as the salt lake brine to be recycled in the first ...

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Abstract

The invention discloses a method for preparing potassium sulfate. The method comprises the following steps: 1) mixing and stirring potassium mixed salt mine, potassium chloride, sodium sulfate and a solvent to obtain a solid-liquid mixture; 2) regulating the solid-liquid volume ratio of the solid-liquid mixture to 1:(3-5), adding a flotation medicament for flotation, and then filtering and separating obtained flotation foam to obtain soft leonite and first mother liquor; 3) mixing the obtained soft leonite and potassium chloride according to the mass ratio of (1.6-2.0): (0.8-1.2), adding a washing solution to basically clean Na<+> in the mixture, and then filtering and separating to obtain a solid phase and second mother liquor; and 4) adding the solid phase in the step 3) into fresh water according to the solid-water mass ratio of (1.0-1.5):1, converting for 1-1.5h at the temperature of 60-70 DEG C, and then cooling, filtering and separating to obtain a potassium sulfate product and third mother liquor. According to the method disclosed by the invention, a byproduct of a salt lake, namely sodium sulfate is fully utilized, fresh water resources are saved in the production process, the production period is shortened, the production efficiency is improved and the production cost is further reduced.

Description

technical field [0001] The invention belongs to the field of salt lake chemistry, and in particular relates to a method for preparing potassium sulfate by utilizing salt lake resources. Background technique [0002] The production method of potassium sulfate at present mainly contains: (1) sulfuric acid method produces potassium sulfate; (2) double decomposition method produces potassium sulfate; (3) seawater or brine produces potassium sulfate; (4) solid potassium ore extraction method produces potassium sulfate; (5) Other specific or developing methods for obtaining potassium sulfate. [0003] Wherein the sulfuric acid method produces the method for potassium sulfate including the Mannheim method: [0004] The Mannheim method is a process for producing potassium sulfate from sulfuric acid and potassium chloride. Its production method is to use potassium chloride and concentrated sulfuric acid to react step by step in the Mannheim furnace. First, the reaction generates po...

Claims

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Application Information

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IPC IPC(8): C01D5/06
Inventor 张永明张志宏赵冬梅杜建宁马艳芳董生发付振海王婧安东胡天琦
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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