Process for preparing potassium sulfate by sea water

A technology of potassium sulfate and seawater, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal compounds, etc., can solve the problem that the potassium reserves of salt lakes cannot meet domestic demand, the production of potassium sulfate is restricted by raw material production, Problems such as high cost of potassium raw material sources, to overcome insufficient potassium reserves, low cost, and good quality

Inactive Publication Date: 2006-06-28
HEBEI UNIV OF TECH +1
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Problems solved by technology

The inventive method overcomes the shortcoming that potassium chloride is used as a raw material to produce potassium sulfate, and the source of potassium raw material cost is high, or the salt lake potassium reserve of producing potassium sulfate as a raw material can not meet the domestic demand far

Method used

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  • Process for preparing potassium sulfate by sea water

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Effect test

Embodiment 1

[0016] The first step, preparation of potassium-rich solution

[0017] Firstly, 4000 grams of sodium-type natural clinoptilolite is filled in a φ30×6000 mm jacketed ion exchange column to form an ion exchange device. Then feed 20 liters of raw material concentrated seawater of 25 ° of B 'e of 24166 grams with the flow velocity of 5 meters / hour to ion-exchange column, carry out adsorption, and adsorption temperature is 30 ℃. The concentration of potassium in the raw material concentrated seawater is 4.30 g / L. After adsorption, the seawater in the ion exchange column is completely ejected with fresh water, and the concentration of potassium in the discharged seawater is 1.15 g / L. Potassium ions in seawater are exchanged into zeolites. According to the data in Table 1, the potassium mother liquor and solid ammonium sulfate after water and the ammonia distillation of the last cycle are formulated as eluent, and the ion exchange column is passed into the above-mentioned ion exchan...

Embodiment 2

[0023] The first step, preparation of potassium-rich solution

[0024]Firstly, 4000 grams of sodium-type natural clinoptilolite is filled in a φ30×6000 mm jacketed ion exchange column to form an ion exchange device. Then feed 600 liters of raw material seawater of 609 kilograms of 2°B'e with a flow velocity of 50 m / h to the ion exchange column for adsorption, and the adsorption temperature is 0°C. The potassium concentration in the raw seawater is 0.32 g / L. After adsorption, the seawater in the ion exchange column is completely ejected with fresh water, and the potassium concentration in the discharged seawater is 0.16 g / L. Potassium ions in seawater are exchanged into zeolites. According to the data in Table 3, the potassium mother liquor and solid ammonium sulfate after water and the ammonia distillation of the last cycle are formulated as eluent, and the ion exchange column is passed into the above-mentioned ion exchange column with a flow velocity of 8 meters / hour. The e...

Embodiment 3

[0030] The first step, preparation of potassium-rich solution

[0031] Firstly, 4000 grams of sodium-type natural clinoptilolite is filled in a φ30×6000 mm jacketed ion exchange column to form an ion exchange device. Then feed 100 liters of raw material concentrated seawater of 109 kilograms of 12 ° B 'e with the flow velocity of 15 m / h to the ion exchange column for adsorption, and the adsorption temperature is 15 ° C. The potassium concentration in the raw seawater is 1.52 g / L. After adsorption, the seawater in the ion exchange column is completely ejected with fresh water, and the potassium concentration in the discharged seawater is 0.75 g / L. Potassium ions in seawater are exchanged into zeolites. According to the data in Table 5, the eluent is formulated with water and the mother liquor and solid ammonium sulfate after the ammonia distillation of the previous cycle, and the eluent with a temperature of 70° C. is passed into the above-mentioned ion exchange column with a ...

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Abstract

A process for preparing potassium sulfate from seawater includes preparing the K-enriched liquid, in which the ammonium sulfate solution is used to elute out the K ions adsorbed by the clinoptilolite in ion exchange column, and preparing potassium sulfate, in which the ammonia is filled in said K-enriched liquid for educing out potassium sulfate. It features no pollution to environment.

Description

technical field [0001] The technical scheme of the present invention relates to the preparation of potassium sulfate, specifically the method for preparing potassium sulfate with seawater. technical background [0002] Potassium sulfate is a high-quality chlorine-free potassium fertilizer. Present potassium sulfate production method mainly contains: take Repone K and sulfuric acid as raw material and adopt high-temperature roasting method (Mannheim method), take Repone K and ammonium sulfate or sodium sulfate as raw material and adopt metathesis conversion method (CN93111750.X, CN93104558 .4, CN94118558.3, CN99115475.4), using salt lake intercrystalline brine as raw material to adopt salt field crystallization method (CN02143641.X, CN03134290.6), and using seawater and sea salt bittern as raw material to adopt ion exchange method (CN02116876.8 ). With the chemical product potassium chloride as raw material, its production cost is directly restricted by the price and source...

Claims

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Application Information

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IPC IPC(8): C01D5/00
Inventor 袁俊生谢英惠张林栋王阳刘燕兰吕铮
Owner HEBEI UNIV OF TECH
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