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Method for preparing basic magnesium carbonate from bittern through mixed alkali method and separating sodium salt and potassium salt in bittern

A separation method and technology of magnesium carbonate, applied in the direction of purification of magnesium carbonate, alkali metal chloride, alkali metal halide, etc., can solve problems such as difficulty in utilization of bittern resources, damage to marine ecological environment, etc., and achieve easy industrialization and economic advantages. Significant, difficulty-reducing effect

Active Publication Date: 2019-10-25
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of efficient utilization of bittern in bittern to solve the problems such as the difficulty in utilization of bittern resources and the destruction of marine ecological environment caused by the enrichment of bittern near the sea. 2+ method, and design a process for separating and utilizing the remaining ions

Method used

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  • Method for preparing basic magnesium carbonate from bittern through mixed alkali method and separating sodium salt and potassium salt in bittern
  • Method for preparing basic magnesium carbonate from bittern through mixed alkali method and separating sodium salt and potassium salt in bittern
  • Method for preparing basic magnesium carbonate from bittern through mixed alkali method and separating sodium salt and potassium salt in bittern

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: the specific operations are as follows:

[0045] 1. Preparation of Basic Magnesium Carbonate Crystals

[0046] The bittern raw material used in the present invention basically consists of: MgCl 2 : 165g·L -1 ;NaCl: 85g·L -1 ; KCl: 20g·L -1 ;MgSO 4 : 67.5g·L -1 .

[0047] (1) Take 250ml of bittern and place it in a 500ml three-neck round bottom flask, and place it in a water bath at 60°C, with a stirrer, add 2.5mol·L -1 Na 2 CO 3 and 3mol L -1 NaOH, guaranteed Mg 2+ :CO 3 2- :OH - The molar ratio of the mixture is 5:4.8:2. After stirring for 120s, it is allowed to stand still for 2.5h to obtain a slurry.

[0048] (2) Filter the slurry obtained in step (1) to obtain 533.5g filtrate and 52.8g solid, and wash the solid to neutral with deionized water, and the quality of the filtrate is composed of: Na + : 7.29%; K + : 0.49%; Cl - : 8.64%; SO 4 2- : 2.53%; CO 3 2- : 0.99%; H 2 O: 80.06%.

[0049] (3) Drying: Dry the solid product obtained i...

Embodiment 2

[0056] Embodiment 2: specific operation is as follows:

[0057] 1. Preparation of Basic Magnesium Carbonate Crystals

[0058] The bittern raw material used in the present invention basically consists of: MgCl 2 : 165g·L -1 ;NaCl: 85g·L -1 ; KCl: 20g·L -1 ;MgSO 4 : 67.5g·L -1 .

[0059] (1) Take 250ml of bittern and place it in a 500ml three-neck round bottom flask, and place it in a water bath at 60°C, with a stirrer, add 2.5mol·L -1 Na 2 CO 3 and 3mol L -1 NaOH, guaranteed Mg 2+ :CO 3 2- :OH - The molar ratio of the mixture is 5:4.8:1.9. After stirring for 120s, let stand for 2.5h to obtain a slurry.

[0060] (2) Filter the slurry obtained in step (1) to obtain 531.3g filtrate and 50.5g solid, and wash the solid to neutral with deionized water, and the quality of the filtrate is composed of: Na + : 7.25%; K + : 0.49%; Cl - :8.68%; SO 4 2- : 2.54%; CO 3 2- : 0.90%; H 2 O: 80.14%

[0061] (3) Drying: Dry the solid product obtained in step (2) at 100°C for...

Embodiment 3

[0068] Embodiment 3: specific operations are as follows:

[0069] 1. Preparation of Basic Magnesium Carbonate Crystals

[0070] The bittern raw material used in the present invention basically consists of: MgCl 2 : 165g·L -1 ;NaCl: 85g·L -1 ; KCl: 20g·L -1 ;MgSO 4 : 67.5g·L -1 .

[0071] (1) Take 250ml of bittern and place it in a 500ml three-neck round bottom flask, and place it in a water bath at 60°C, with a stirrer, add 2.5mol·L -1 Na 2 CO 3 and 3mol L -1 NaOH, guaranteed Mg 2+ :CO 3 2- :OH - The molar ratio of the mixture is 5:4.8:2.1. After stirring for 120s, it is allowed to stand still for 2.5h to obtain a slurry.

[0072] (2) Filter the slurry obtained in step (1) to obtain 538.7g filtrate and 52.8g solid, and wash the solid to neutral with deionized water, and the quality of the filtrate is composed of: Na + : 7.24%; K + : 0.48%; Cl - : 8.56%; SO 4 2- : 2.51%; CO 3 2- : 1.02%; H 2 O: 80.19%.

[0073] (3) Drying: Dry the solid product obtained i...

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Abstract

The invention discloses a method for preparing basic magnesium carbonate from bittern through a mixed alkali method and separating sodium salt and potassium salt in the bittern. The method comprises the following steps that (1) a basic magnesium carbonate crystal is prepared, specifically, bittern is added into a reactor, and then a Na2CO3 solution and a NaOH solution are added to obtain slurry, filtering is conducted to obtain filtrate and a solid, and the solid is dried for 8-10 h to obtain the basic magnesium carbonate crystal; (2) an equivalent CaCl2 solution is added into the obtained filtrate, after reaction, filtering is conducted to obtain filtrate, isothermal evaporative crystallization is conducted, and filtering is conducted to obtain related substances; and (3) KCl and NaCl inresidual mother liquor are separated and extracted. After reaction, magnesium ions are nearly completely converted, the bittern is efficiently utilized, and subsequent separation is simplified. The bittern reacts with mixed alkali, the mother liquor does not contain bicarbonate ions after reaction, compositions of the mother liquor after reaction are simplified, and the difficulty of subsequent separation is lowered.

Description

technical field [0001] The invention relates to a new method for synthesizing basic magnesium carbonate by a mixed alkali method and the separation of subsequent mother liquor. Background technique [0002] The mother liquor after seawater evaporation and salt production is called bittern. The mother liquor contains a large amount of sodium, magnesium, potassium and other inorganic salts. It is a treasure house of valuable resources. The by-product of bittern in my country is 20 million cubic meters per year. 3 , but the utilization rate of bittern is less than 20%, and a large amount of bittern resources are discharged into the sea or circulated in salt pans, which not only causes a waste of resources but also affects the ecological balance of offshore waters. Therefore, the efficient and comprehensive utilization of bittern resources has always been a topic worthy of discussion and research. [0003] Bittern contains a large amount of magnesium salt, which is converted in...

Claims

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Application Information

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IPC IPC(8): C01F5/24C01D3/14C01D3/06
CPCC01D3/06C01D3/14C01F5/24
Inventor 曹吉林王晶瑶郭宏飞赵斌陈学青谭朝阳张广林
Owner HEBEI UNIV OF TECH
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