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Method for preparing potassium chloride from seawater

A process method and technology of potassium chloride, applied in directions such as alkali metal chloride, can solve the problems of high overall energy consumption, high energy consumption and the like, and achieve the effects of improving economic benefits, simple process and reducing costs

Active Publication Date: 2010-10-06
东方海钾(厦门)海洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this method is in the potassium-enriched mother liquor that potassium-enriched operation makes K + content of only 19.45-21.45 grams per liter, resulting in higher energy consumption for the subsequent evaporation, concentration and separation process, and the need to add more water for subsequent carnallite decomposition and crude potassium washing, making this method The overall energy consumption is high

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  • Method for preparing potassium chloride from seawater
  • Method for preparing potassium chloride from seawater
  • Method for preparing potassium chloride from seawater

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The first step, preparation of potassium-rich solution

[0022] Firstly, 6000 grams of sodium-type modified zeolite is filled in 6 ion exchange columns with a jacket of φ30×12000 mm, and the ion exchange device is formed in series. Pass into 1000 liters (1014 kilograms) 2 ° of Be ' raw seawater to ion-exchange column with the flow velocity (empty tower flow velocity) of 45 meters / hour then, carry out adsorption, and adsorption temperature is 10 ℃. The potassium concentration in the raw seawater is 0.32 g / L, and the potassium concentration in the seawater discharged after adsorption is 0.22 g / L, and the potassium ions in the seawater are exchanged into the zeolite. Wash all the seawater in the zeolite column with tap water. According to the data in table 1, to above-mentioned ion-exchange column with the flow velocity (superficial tower flow velocity) of 5 meters / hour, pass into the eluent 2700ml (2999 grams) that temperature is 25 ℃ and carry out elution, when obtainin...

Embodiment 2

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

[0031] Firstly, 6000 grams of sodium-type modified zeolite is filled in 6 ion exchange columns with a jacket of φ30×12000 mm, and the ion exchange device is formed in series. Then feed 150 liters (164 kilograms) of 12 ° Be ' raw material concentrated seawater to the ion exchange column with a flow velocity of 25 m / h for adsorption, and the adsorption temperature is 0 ° C. The potassium concentration in the raw seawater is 1.52 g / L, and the potassium concentration in the discharged seawater after adsorption is 0.70 g / L. Wash all the seawater in the zeolite column with tap water. According to the data in Table 3, the eluent 3000ml (3368 grams) of 95 ℃ of temperature is passed into the above-mentioned ion-exchange column with the flow velocity of 8 meters / hour to carry out elution, stops when obtaining potassium-rich liquid 2700ml (3155 grams) elute. The composition of the potassium-rich liquid is shown in Table 3...

Embodiment 3

[0039] The first step, preparation of potassium-rich solution

[0040] Firstly, 6000 grams of sodium-type modified zeolite is filled in 6 ion exchange columns with a jacket of φ30×12000 mm, and the ion exchange device is formed in series. Then feed 600 liters (631 kilograms) of 7 ° Be ' raw material concentrated seawater to the ion exchange column with a flow velocity of 35 m / h for adsorption, and the adsorption temperature is 30 ° C. The potassium concentration in the raw seawater is 0.71 g / L, and the potassium concentration in the discharged seawater after adsorption is 0.55 g / L. Potassium ions in seawater are exchanged into zeolites. Wash all the seawater in the zeolite column with tap water. According to the data in Table 5, 2300ml (2586 grams) of eluent 2300ml (2586 grams) of 85 ℃ of temperature is passed into the above-mentioned ion-exchange column with the flow velocity of 10 meters / hour to carry out elution, stop when obtaining potassium-rich liquid 2100ml (2482 gram...

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Abstract

The invention relates to a method for preparing potassium chloride from seawater. The method mainly comprises a potassium ion adsorbing and eluting process, an evaporating and concentrating process, a heat preserving and settling process, a cooling and crystallizing process and the like. The method comprises the following specific steps of: introducing the seawater serving as a raw material into an ion exchange column which is filled with sodium clinoptilolite at room temperature for adsorbing until potassium ions fully undergoes an exchange reaction with sodium ions on the clinoptilolite, namely, adsorption of the potassium ions reaches a saturated state; washing off the seawater in the ion exchange column with water; introducing an eluent which contains ammonium chloride and sodium chloride into the ion exchange column, wherein the ammonium chloride accounts for 15 to 25 mass percent of the eluent and the sodium chloride accounts for 10 mass percent of the eluent; eluting the potassium ions on the clinoptilolite to obtain potassium-rich fluid; evaporating and concentrating the potassium-rich fluid to obtain supernate; cooling the supernate and introducing ammonia into the cooled supernate; and separating ammonia out and crystallizing the supernate to obtain the potassium chloride. The method has the advantages of simple technical process, no discharge of waste liquid in the technical process and capability of further lowering the cost by recycling the clinoptilolite, ammonia water and saline water, enhancing economic benefit and breaking a new path for national supply of agricultural potassium fertilizers.

Description

technical field [0001] The invention relates to the preparation of potassium chloride, in particular to a process for preparing potassium chloride from seawater. technical background [0002] Potassium chloride is the most important type of potash fertilizer, and it is widely used in chemical industry, petroleum and pharmaceutical industries. At present, potassium chloride at home and abroad is mainly processed from land solid potassium ore or salt lake brine. Due to the shortage of land potassium resources in our country, the domestic potassium chloride mainly depends on imports. Therefore, it is very necessary to develop new technologies for the development of seawater potassium resources with a total reserve of 550 trillion tons. [0003] In terms of extracting potassium from seawater, scientists at home and abroad have successively proposed a variety of process methods including four technical routes including chemical precipitation, solvent extraction, membrane separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06
Inventor 袁俊生陈建新郭小甫纪志永谢英惠邓会宁苏敏王军王阳刘燕兰张林栋
Owner 东方海钾(厦门)海洋科技有限公司
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