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Method for preparing magnesium potassium sulfate by utilizing seawater salt-making bittern

A technology of potassium magnesium sulfate and potassium sulfate, applied in the direction of bisulphate preparation, etc., can solve the problems of high energy consumption and loss of salinization enterprises, and achieve the effects of low energy consumption, low cost and broad market prospects

Pending Publication Date: 2020-07-03
天津君瑞和科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main products of this method are sodium chloride, magnesium sulfate, potassium chloride and magnesium chloride. Due to the low market price of the products and high energy consumption, the salinization enterprises that process salt bittern are in a serious loss situation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The method for preparing potassium and magnesium sulfate by utilizing seawater salt-making bittern of the present embodiment may further comprise the steps:

[0036] Take 4200L seawater salt bittern and 3000L old bittern respectively, wherein, in the seawater salt bittern, contain the NaCl of 90g / L, the MgCl of 150g / L 2 , 25g / L of KCl and 50g / L of MgSO 4 ; In the old bittern, contain the NaCl of 3g / L, the MgCl of 350g / L 2 , 2g / L of KCl and 10g / L of MgSO 4 .

[0037] Pump salt bittern and old bittern from seawater into the mixing tank for continuous stirring and mixing. A single-effect evaporator (purchased from Changzhou Pointe Environmental Protection Equipment Co., Ltd., specification WZ3000) is used, and the final evaporation temperature is 120°C , and then cooled down to 40°C. The solid that crystallizes out is separated, gets mother liquor, and it contains the NaCl of 3g / L, the MgCl of 300g / L 2 , 10g / L of KCl and 45g / L of MgSO 4 . By adopting the method of t...

Embodiment 2

[0040] The method for preparing potassium and magnesium sulfate by utilizing seawater salt-making bittern of the present embodiment may further comprise the steps:

[0041] Take 9000L seawater salt bittern and 3000L old bittern respectively, wherein, in the seawater salt bittern, contain the NaCl of 150g / L, the MgCl of 200g / L 2 , 40g / L of KCl and 100g / L of MgSO 4 ; In the old bittern, contain the NaCl of 40g / L, the MgCl of 450g / L 2 , 8g / L of KCl and 50g / L of MgSO 4 .

[0042] Pump salt bittern and old bittern from seawater into the mixing tank for continuous stirring and mixing. A three-effect evaporator (purchased from Changzhou Longhu Drying Engineering Co., Ltd., specification SJN-5000) is used, and the final evaporation temperature is 130 °C, and then cooled down to 80 °C. The solid that crystallizes out is separated, gets mother liquor, and it contains the NaCl of 15g / L, the MgCl of 400g / L 2 , 25g / L of KCl and 45g / L of MgSO 4. By adopting the method of this embodim...

Embodiment 3

[0045] The method for preparing potassium and magnesium sulfate by utilizing seawater salt-making bittern of the present embodiment may further comprise the steps:

[0046] Take 5000L seawater salt bittern and 3000L old bittern respectively, wherein, in the seawater salt bittern, contain the NaCl of 97g / L, the MgCl of 169g / L 2 , 31g / L of KCl and 68g / L of MgSO 4 ; In the old bittern, contain the NaCl of 20g / L, the MgCl of 400g / L 2 , 6g / L of KCl and 25g / L of MgSO 4 .

[0047] The seawater salt bittern and the old bittern are pumped into the mixing tank for continuous stirring and mixing, and a double-effect evaporator (purchased from Ge Ling (Shanghai) Environmental Technology Co., Ltd., the specification is GLWXH-03) is used. The evaporation end temperature to 125°C, and then cooled down to 60°C. The crystallized solid is separated, and the mother liquor is taken, which is the brine after removing sodium chloride, containing 11g / L of NaCl and 385g / L of MgCl 2 , 21g / L of KC...

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PUM

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Abstract

The invention discloses a method for preparing magnesium potassium sulfate by utilizing seawater salt-making bittern, belonging to the technical field of sea salt bittern production. The method for preparing the magnesium potassium sulfate by using the seawater salt-making bittern comprises the following steps: mixing the seawater salt-making bittern and old bittern under stirring, carrying out evaporating and cooling, and separating solids separated out by crystallization so as to obtain a mother liquor; and adding an extracting agent into the mother liquor, carrying out separating so as to obtain an intermediate solid, and carrying out conversion refining and drying so as to obtain a magnesium potassium sulfate finished product. According to the method for preparing the magnesium potassium sulfate by utilizing the seawater salt-making bittern, sodium chloride in the seawater salt-making bittern is removed firstly, so the content of the sodium chloride in the sodium chloride removed bittern is low; the extracting agent is then added into the sodium chloride removed bittern to prepare magnesium potassium sulfate crystals at a low temperature; the magnesium potassium sulfate crystals are subjected to conversion refining and drying to obtain the high-quality magnesium potassium sulfate finished product; and thus, the method provided by the invention has good economic prospects and social benefits.

Description

technical field [0001] The invention relates to a method for preparing potassium and magnesium sulfate by using salt bittern prepared from seawater, and belongs to the technical field of sea salt bittern chemical production. Background technique [0002] In the sea salt production process, about 1m of 3 Salt waste liquid (commonly known as bittern). Bittern contains relatively high concentrations of chloride ions, sulfate ions, potassium ions, magnesium ions, sodium ions and other ions, and is mostly used to produce industrial salt, magnesium chloride, potassium chloride, magnesium sulfate and other products. Various chemical elements in bittern are about 40 times more concentrated than seawater, which is an excellent raw material for extracting chemical elements in seawater. However, limited by the technical level, sea salt bittern chemical companies are generally in a state of loss. Realizing the thorough comprehensive utilization of bittern is an effective measure to so...

Claims

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Application Information

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IPC IPC(8): C01D5/12
CPCC01D5/12C01P2006/80
Inventor 杨志梅
Owner 天津君瑞和科技有限公司