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Method for producing magnesium oxide whiskers from bittern in dry salt lake

A technology of magnesium oxide whiskers and brine, which is applied in the field of energy utilization to achieve the effects of low energy consumption, reduced local over-concentration phenomenon and good quality

Inactive Publication Date: 2018-06-05
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant report on the use of bittern to prepare magnesium oxide whiskers

Method used

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  • Method for producing magnesium oxide whiskers from bittern in dry salt lake
  • Method for producing magnesium oxide whiskers from bittern in dry salt lake
  • Method for producing magnesium oxide whiskers from bittern in dry salt lake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The synthetic route of the method for producing magnesium oxide whiskers from the bittern of dried up salt lake that the present embodiment provides is as follows figure 1 shown. The specific method is as follows:

[0033] (1) In a volume of 7.5m 3 Into the salt pond, introduce 2 tons of brine (the brine of Keke Salt Lake), add

[0034] Tap water until the bittern is completely dissolved (with proper stirring) to obtain bittern. The volume of the bittern solution was measured to be 2.8m 3 , the concentration of magnesium ions is 2.6mol / L, filter.

[0035] (2) Prepare a 0.60mol / L NaOH solution, and at the same time, add a small amount of NaOH to it 2 CO 3 , and make Na 2 CO 3 The concentration is 0.08mol / L.

[0036] (3) NaOH / Na 2 CO 3 The solution and the bittern solution are introduced into the above-mentioned salt pool at a volume ratio of 1:3. Then put it in an open place in the salt lake area and expose to the wind and sun for 72 hours (the temperature is...

Embodiment 2

[0042] The method that present embodiment provides produces magnesium oxide whisker from the brine of dried up salt lake as follows:

[0043] (1) In a volume of 7.5m 3 Into the brine pond, introduce 2 tons of bittern (the bittern of Keke Salt Lake), add tap water until the bittern is completely dissolved (with proper stirring) to get bittern. The volume of the bittern solution was measured to be 2.8m 3 , the concentration of magnesium ions is 2.6mol / L, filter.

[0044] (2) Prepare a 0.57mol / L KOH solution, and at the same time, add a small amount of K to it 2 CO 3 , and make K 2 CO 3 The concentration is 0.09mol / L.

[0045] (3) KOH / K 2 CO 3 The solution and the bittern solution are introduced into the above-mentioned salt pool at a volume ratio of 1:2.98. Then put it in an open place in the salt lake area and expose to the wind and sun for 67 hours (the temperature is about 0°C, the wind speed is about 5m / s), and then filter it with dense gauze to get the precipitate ...

Embodiment 3

[0051] The method that present embodiment provides produces magnesium oxide whisker from the brine of dried up salt lake as follows:

[0052] (1) In a volume of 7.5m 3 Into the brine pond, introduce 2 tons of bittern (the bittern of Keke Salt Lake), add tap water until the bittern is completely dissolved (with proper stirring) to get bittern. The volume of the bittern solution was measured to be 2.8m 3 , the concentration of magnesium ions is 2.9mol / L, filter.

[0053] (2) Prepare a 0.63mol / L NaOH solution, and at the same time, add a small amount of NaOH solution to it 2 CO 3 , and make Na 2 CO 3 The concentration is 0.10mol / L.

[0054] (3) NaOH / Na 2 CO 3 The solution and the bittern solution are introduced into the above-mentioned salt pool at a volume ratio of 1:3.02. Then put it in an open place in the salt lake area and expose to the wind and sun for 77 hours (the temperature is about 50°C, the wind speed is about 4m / s), and then filter it with dense gauze to get...

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Abstract

The invention relates to a method for producing magnesium oxide whiskers from bittern in a dry salt lake. The method comprises the following steps: S1, taking the bittern, dissolving in water, and then filtering to obtain brine, wherein the brine has the magnesium ion concentration of 2.3-2.9 mol / L; S2, mixing the brine with a strong alkali / carbonate solution, wherein the strong alkali / carbonate solution has the strong alkali concentration of 0.57-0.63 mol / L and the carbonate concentration of 0.06-0.1 mol / L, and the volume ratio of the brine to the strong alkali / carbonate solution is (2.98-3.02):1; S3, under the conditions that the temperature is -1 DEG C to 51 DEG C and the wind speed is 4-5m / s, evaporating water of a solution obtained in the S2 for 67-77 hours, then filtering, and lightly roasting an obtained precipitate to obtain the magnesium oxide whiskers, wherein an obtained filtrate is applied to the next cycle. The magnesium oxide whiskers prepared by the method provided by the invention have the ratio of length to diameter of (20-30):1 and have good dispersion and high quality.

Description

technical field [0001] The invention belongs to the field of energy utilization, and more specifically relates to a method for producing magnesium oxide whiskers from bittern in dried up salt lakes. Background technique [0002] Dry salt lakes refer to some salt lakes in Qinghai that are in a dry or semi-dry state due to perennial wind, sun and strong evaporation. The brine in the dry salt lake refers to the salt block that condenses into a solid block after the high-concentration brine loses water. This bittern is rich in inorganic salts such as magnesium chloride and sodium chloride. [0003] Magnesium oxide whiskers have no or very few defects, and their atomic arrangement is highly ordered, and they are not easy to coexist, embed or combine with other ions. The preparation of magnesium oxide whiskers from brine in dried up salt lakes is of great practical significance to meet the market needs of toughening and reinforcing materials and flame retardant materials, turnin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/16C30B29/62C30B7/14
CPCC30B29/16C30B7/14C30B29/62
Inventor 吴健松
Owner LINGNAN NORMAL UNIV
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