Method for producing alkali magnesium iodide crystal whisker from bittern of dried lake

A technology of magnesium iodide and brine, applied in the direction of magnesium halide, etc., to achieve low energy consumption, small concentration changes, and good quality

Inactive Publication Date: 2018-04-20
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 of using bittern to prepare basic magnesium iodide whiskers

Method used

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  • Method for producing alkali magnesium iodide crystal whisker from bittern of dried lake
  • Method for producing alkali magnesium iodide crystal whisker from bittern of dried lake
  • Method for producing alkali magnesium iodide crystal whisker from bittern of dried lake

Examples

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Effect test

Embodiment 1

[0031] The synthetic route of the method for producing basic magnesium iodide whiskers from the bittern of dried up salt lake provided by the present embodiment is as follows figure 1 shown. The specific method is as follows:

[0032] (1) In a volume of 7.5m 3 Into the brine pond, introduce 2 tons of brine (the brine of Keke Salt Lake), and add tap water until the brine is completely dissolved (with proper stirring). The measured solution volume is 2.8m 3 , filtered, and the concentration of magnesium ions was 2.600mol / L at this time.

[0033] (2) Prepare a 2.60mol / L NaBr solution, and at the same time, add a small amount of NaOH to it to make the NaOH concentration 0.20mol / L.

[0034] (3) Introduce NaBr / NaOH solution and bittern solution into the above-mentioned salt pool at a volume ratio of 1:1. Then put it in an open place in the salt lake area and expose it to the wind and sun for 72 hours (the temperature is about 35°C and the wind speed is about 4.5m / s), and then f...

Embodiment 2

[0039] The method that the present embodiment provides to produce basic magnesium iodide whiskers from the brine of dried up salt lake is as follows:

[0040] (1) In a volume of 7.5m 3 Into the brine pond, introduce 2 tons of brine (the brine of Keke Salt Lake), and add tap water until the brine is completely dissolved (with proper stirring). The measured solution volume is 2.8m 3 , filtered, and the concentration of magnesium ions was 2.30mol / L.

[0041] (2) Prepare a 2.90mol / L KBr solution, and at the same time, add a small amount of KOH to it to make the KOH concentration 0.22mol / L.

[0042] (3) Introduce the KBr / KOH solution and the bittern solution into the above-mentioned salt pool at a volume ratio of 0.98:1. Then put it in an open place in the salt lake area and expose it to the wind and sun for 67 hours (the temperature is about 0°C and the wind speed is about 5m / s), and then filter the bittern with dense gauze to get basic magnesium iodide whiskers . After washi...

Embodiment 3

[0047] The method that the present embodiment provides to produce basic magnesium iodide whiskers from the brine of dried up salt lake is as follows:

[0048] (1) In a volume of 7.5m 3 Into the brine pond, introduce 2 tons of brine (the brine of Keke Salt Lake), and add tap water until the brine is completely dissolved (with proper stirring). The measured solution volume is 2.8m 3 , and filtered, the concentration of magnesium ions was 2.90mol / L.

[0049](2) Prepare a 2.30mol / L NaBr solution, and at the same time, add a small amount of NaOH to it to make the NaOH concentration 0.18mol / L.

[0050] (3) Introduce NaBr / NaOH solution and bittern solution into the above-mentioned salt pool at a volume ratio of 1.02:1. Then put it in an open place in the salt lake area and expose it to the wind and sun for 77 hours (the temperature is about 50°C and the wind speed is about 4m / s), and then filter the bittern with dense gauze to get basic magnesium iodide whiskers . After washing ...

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Abstract

The invention relates to a method for producing alkali magnesium iodide crystal whiskers from bittern of a dried lake. The method comprises the following steps: S1, dissolving bittern into water so asto obtain brine, wherein the concentration of magnesium ions in the brine is 2.3-2.9mol / L; S2, mixing the brine with an iodate / strong alkali solution, wherein the concentration of iodate in the iodate / strong alkali solution is 2.3-2.9mol / L, the concentration of the strong alkali is 0.18-0.22mol / L, and the volume ratio of the brine to the iodate / strong alkali solution is (0.98-1.02):1; S3, performing moisture evaporation on the solution obtained in the step S2 at minus 1 DEG C to 51 DEG C at an air speed of 4-5m / s for 67-77 hours, filtering so as to obtain precipitate, namely the alkali magnesium iodide crystal whiskers, and recycling obtained filtrate for next circulation treatment. The draw ratio of the alkali magnesium iodide crystal whiskers prepared by using the method provided by theinvention is (20-30):1, and the alkali magnesium iodide crystal whiskers are good in dispersability and high in quality.

Description

technical field [0001] The invention belongs to the field of energy utilization, and more specifically relates to a method for producing basic magnesium iodide 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] Basic magnesium iodide whiskers have no or very few defects, and its atomic arrangement is highly ordered, and it is not easy to symbiosis, entrap or combine with other ions. The preparation of basic magnesium iodide 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 retardan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/26
CPCC01F5/26C01P2004/03C01P2004/10C01P2004/54
Inventor 吴健松
Owner LINGNAN NORMAL UNIV
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