Method for removing magnesium in seawater potassium extraction process

A seawater and removal technology, which is applied in the fields of potassium extraction from seawater and magnesium removal, can solve problems such as the quality decline of potassium products, and achieve the effects of low cost, easy availability of materials and simple technological process.

Active Publication Date: 2012-08-22
金盛海洋科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: provide a method for removing magnesium in the process of extracting potassium from seawater, and solve the problem that the magnesium in the potassium-rich solution will cause the quality of the final potassium product to decline

Method used

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  • Method for removing magnesium in seawater potassium extraction process
  • Method for removing magnesium in seawater potassium extraction process
  • Method for removing magnesium in seawater potassium extraction process

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Before the potassium enrichment device, a magnesium removal device Ⅰ is installed, which is filled with a fixed bed type 2kgD113 macroporous cation exchange resin, and the filling capacity of the ion exchange resin is to treat 1m 3 The amount of seawater is 22kg, and the magnesium removal device II is installed in front of the evaporation device, which is filled with 2kg of C800 ion exchange resin of fixed bed type, and the filling capacity of the ion exchange resin is to treat 1m 3 Potassium-rich solution, the dosage is 30kg. The temperature of the seawater raw material is 20°C, and the seawater containing 1.27g / L of magnesium is passed into the magnesium removal device Ⅰ from bottom to top, and the superficial velocity of the fixed bed in the seawater into the magnesium removal device Ⅰ is 5m / h. 20L, the seawater is in contact with the ion exchange resin in the magnesium removal device Ⅰ, the magnesium content is reduced to 0.12g / L, and 90% of the magnesium in the sea...

Embodiment 2

[0024] Before the potassium enrichment device, a magnesium removal device Ⅰ is installed, which is filled with 2kg of D152 macroporous cation exchange resin of the moving bed type, and the filling capacity of the ion exchange resin is to treat 1m 3 The amount of seawater is 36kg, and the magnesium removal device II is installed in front of the evaporation device, which is filled with 2kg of C800 ion exchange resin of moving bed type, and the filling capacity of the ion exchange resin is to treat 1m 3 Potassium-rich solution, the dosage is 30kg. The temperature of the seawater raw material is 20°C, the seawater containing 1.27g / L of magnesium is passed into the magnesium removal device Ⅰ from bottom to top, and the superficial velocity of the fixed bed in the seawater into the magnesium removal device Ⅰ is 8m / h. 20L, the seawater is in contact with the ion exchange resin in the magnesium removal device Ⅰ, the magnesium content is reduced to 0.11g / L, and 90% of the magnesium in ...

Embodiment 3

[0026] Before the potassium enrichment unit, a magnesium removal unit Ⅰ is set, which is filled with 2kg of C800 ion exchange resin of fixed bed type, and the filling capacity of the ion exchange resin is to treat 1m 3 The amount of seawater is 50kg, and the magnesium removal device II is installed in front of the evaporation device, which is filled with 2kg of D152 macroporous cation exchange resin of fixed bed type, and the filling capacity of the ion exchange resin is to treat 1m 3 Potassium-rich solution, the dosage is 50kg. The temperature of the seawater raw material is 30°C, the seawater containing 1.27g / L of magnesium is passed into the magnesium removal device Ⅰ from bottom to top, and the superficial velocity of the fixed bed in the magnesium removal device Ⅰ is 10m / h. 20L, the seawater is in contact with the ion exchange resin in the magnesium removal device Ⅰ, the magnesium content is reduced to 0.12g / L, and 90% of the magnesium in the seawater is removed; the seaw...

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Abstract

The invention relates to an ion-exchange method for treating seawater, particularly a method for removing magnesium in a seawater potassium extraction process. The devices for removing magnesium are as follows: a magnesium removing device I is arranged before a potassium enriching device, wherein an ion exchange resin in a bed form is filled in the magnesium removing device I; and a magnesium removing device II is arranged before an evaporator, wherein an ion exchange resin in a bed form is filled in the magnesium removing device II. The method comprises the following steps: introducing seawater into the magnesium removing device I to contact the ion exchange resin in the magnesium removing device I, wherein 90% of magnesium in the seawater is removed; introducing the seawater subjected to magnesium removal into the potassium enriching device; introducing the potassium-enriched solution produced by the potassium enriching device into the magnesium removing device II to contact the ion exchange resin in the magnesium removing device II, wherein 90% of magnesium in the potassium-enriched solution is removed; and sequentially sending the potassium-enriched solution subjected to magnesium removal into the evaporator, a crystallizing device and a separation device to finally obtain the potassium salt product. The method provided by the invention solves the problem that magnesium in the potassium-enriched solution can lower the quality of the finally prepared potassium product.

Description

technical field [0001] The technical scheme of the invention relates to the treatment of seawater by an ion exchange method, specifically a method for removing magnesium in the process of extracting potassium from seawater. Background technique [0002] There are rich potassium resources in seawater. Potassium ion exchangers are used to obtain a solution with a high potassium content-potassium-rich solution through potassium absorption and elution methods, and then the potassium-rich solution is evaporated, crystallized, and separated to produce potassium. Salt. However, because the seawater contains magnesium, it will affect the enrichment effect of the potassium ion exchanger, and the magnesium in the potassium-enriched solution will cause the quality of the finally obtained potassium product to decline. The prior art has not disclosed a method for removing magnesium in the process of extracting potassium from seawater. Contents of the invention [0003] The technical ...

Claims

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Application Information

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IPC IPC(8): C01D3/14
Inventor 袁俊生谢英惠郭小甫纪志永刘杰
Owner 金盛海洋科技股份有限公司
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