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Method for preparing anhydrous magnesium carbonate by directly utilizing salt lake brine

A technology of anhydrous magnesium carbonate and salt lake brine, applied in the direction of magnesium carbonate, etc., can solve the problems of good dispersibility of anhydrous magnesium carbonate, harsh reaction conditions, cumbersome preparation process, etc., to increase additional utilization value, simple equipment, and process flow simple effect

Pending Publication Date: 2021-03-12
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] Technical problem to be solved: Aiming at problems such as harsh reaction conditions, long reaction time, high equipment requirements, and cumbersome preparation process in the process of extracting anhydrous magnesium carbonate in the prior art, the present invention provides a method for directly using salt lake brine to prepare anhydrous magnesium carbonate. The method for magnesium carbonate has simple process, mild conditions, low raw material price, and the prepared anhydrous magnesium carbonate has good dispersibility and relatively uniform size

Method used

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  • Method for preparing anhydrous magnesium carbonate by directly utilizing salt lake brine
  • Method for preparing anhydrous magnesium carbonate by directly utilizing salt lake brine
  • Method for preparing anhydrous magnesium carbonate by directly utilizing salt lake brine

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Embodiment 1

[0029] A kind of method that directly utilizes salt lake brine to prepare anhydrous magnesium carbonate, the steps of this method are as follows: add urea in brine, control urea and Mg in brine 2+ The molar ratio was 2.5:1, the initial pH of the mixed solution was adjusted to 8.5 with 5 mol / L NaOH solution, the above mixed solution was magnetically stirred for 20 min at a stirring speed of 200 r / min, and then placed in a 100 mL reaction kettle, Then put the reaction kettle into an oven, set the oven temperature to 180 °C, and cool the reaction kettle to room temperature after 6 hours of reaction to obtain the reaction solution; filter the reaction solution with suction, and then wash three times with deionized water until the pH value is 7.0 , and dried in an oven at 80 °C for 12 h to obtain anhydrous magnesium carbonate powder. Depend on figure 1 It can be seen that the particle size of the obtained anhydrous magnesium carbonate is about 5 um, and under this reaction system,...

Embodiment 2

[0031] A kind of method that directly utilizes salt lake brine to prepare anhydrous magnesium carbonate, the steps of this method are as follows: add urea in brine, control urea and Mg in brine 2+ The molar ratio was 2.0:1, the initial pH of the mixed solution was adjusted to 8.0 with 5 mol / L NaOH solution, the above mixed solution was magnetically stirred for 20 min at a stirring speed of 300 r / min, and then placed in a 100 mL reaction kettle, Then put the reaction kettle into an oven, set the oven temperature to 180 °C, and cool the reaction kettle to room temperature after 3 hours of reaction to obtain the reaction solution; filter the reaction solution with suction, and then wash with deionized water three times until the pH value is 7.0 , and dried in an oven at 80 °C for 12 h to obtain anhydrous magnesium carbonate powder. Depend on figure 2 It can be seen that the particle size of the obtained anhydrous magnesium carbonate is about 3~6 um, and under this reaction syst...

Embodiment 3

[0033] A kind of method that directly utilizes salt lake brine to prepare anhydrous magnesium carbonate, the steps of this method are as follows: add urea in brine, control urea and Mg in brine 2+ The molar ratio was 2.5:1, the initial pH of the mixed solution was adjusted to 9.0 with 5 mol / L NaOH solution, the above mixed solution was magnetically stirred for 20 min at a stirring speed of 400 r / min, and then placed in a 100 mL reaction kettle, Then put the reaction kettle into an oven, set the oven temperature to 180 °C, and cool the reaction kettle to room temperature after 2 hours of reaction to obtain the reaction solution; filter the reaction solution with suction, and then wash three times with deionized water until the pH value is 7.0 , and dried in an oven at 80 °C for 12 h to obtain anhydrous magnesium carbonate powder. Depend on image 3 It can be seen that the particle size of the obtained anhydrous magnesium carbonate is about 3~6 um, and under this reaction syste...

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Abstract

The invention relates to a method for preparing anhydrous magnesium carbonate by directly utilizing salt lake brine, and the method comprises the following steps: extracting potash magnesium sulphatefertilizer from the salt lake brine, then extracting potassium chloride, and then extracting boron to finally obtain sulfate type brine; adding urea into the brine, adjusting the pH value of the mixedsolution to 7.0-14.0, uniformly stirring, putting into a reaction kettle, controlling the reaction temperature to be 120-250 DEG C and the reaction time to be 1-12 hours, and naturally cooling to room temperature to obtain a reaction solution; carrying out suction filtration on the reaction solution, performing washing until the pH value is 7.0, and drying at 40-200 DEG C for 4-48 hours to obtainthe anhydrous magnesium carbonate. The preparation method provided by the invention is simple to operate, efficient and energy-saving, the used raw materials are low in price, large-scale industrialproduction of the anhydrous magnesium carbonate powder can be realized, and the prepared anhydrous magnesium carbonate is used as a novel inorganic flame retardant and can be used as an inorganic flame retardant additive of products such as plastics, rubber and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of anhydrous magnesium carbonate micro-nano materials, and in particular relates to a method for directly using salt lake brine to prepare anhydrous magnesium carbonate. Background technique [0002] The Qaidam Basin in Qinghai is the lake area with the most abundant salt lake resources in my country. The proven mineable magnesium salt reserves are about 6.5 billion tons, accounting for about 96.8% of the national reserves. The biggest feature of magnesium salts in salt lakes is the close symbiosis of magnesium and potassium, sodium, calcium, lithium and other salts. However, due to the lack of applicable technology and corresponding basic research, compared with the development of potassium and lithium resources in salt lakes, the development and utilization of magnesium resources lag behind seriously. During the production of potassium salt, 10 times as much magnesium salt as potassium salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24
CPCC01F5/24C01P2004/61
Inventor 徐世爱鲁云花毕秋艳赵春艳柴克松
Owner EAST CHINA UNIV OF SCI & TECH
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