Method for preparing basic magnesium sulfate whiskers by recycling mother liquor

A technology of magnesium sulfate whiskers and circulating mother liquor, applied in magnesium sulfate, chemical instruments and methods, single crystal growth and other directions, can solve problems such as complicated processes, and achieve the effects of high added value, good quality and simple process

Inactive Publication Date: 2011-01-26
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shape of whiskers prepared by this method is relatively regular (diameter 0.1-2.0 μm, length 10-100 μm), and the oil and moisture absorption are excellent, but the process of this method is more complicated

Method used

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  • Method for preparing basic magnesium sulfate whiskers by recycling mother liquor
  • Method for preparing basic magnesium sulfate whiskers by recycling mother liquor
  • Method for preparing basic magnesium sulfate whiskers by recycling mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 A kind of method of circulating mother liquor method to prepare basic magnesium sulfate whisker, comprises the following steps:

[0031] (1) 1700g of the mother liquor for the preparation of basic magnesium sulfate whiskers is taken, and concentrated to 650g by evaporation in a universal electric furnace. Now, the mother liquor contains 10.0% sodium sulfate mass fraction and 12.0% magnesium sulfate mass fraction.

[0032] Freeze and crystallize the concentrated mother liquor at -3°C in a low-temperature thermostat to precipitate sodium sulfate decahydrate; filter sodium sulfate decahydrate through a circulating water vacuum pump to obtain solid sodium sulfate decahydrate and filter the mother liquor.

[0033] (2) Get 372mL of the filtered mother liquor obtained in step (1), add distilled water and MgSO 4 ·7H 2 O solid, dilute to a magnesium sulfate solution with a molar concentration of 0.8mol / L; then add NaOH solid according to the molar ratio of magnesiu...

Embodiment 2

[0036] Embodiment 2 A kind of method of circulating mother liquor method to prepare basic magnesium sulfate whisker, comprises the following steps:

[0037] (1) 1700g of the mother liquor for the preparation of basic magnesium sulfate whiskers is taken, and concentrated to 600g by evaporation in a universal electric furnace. Now, the mother liquor contains 10.8% sodium sulfate mass fraction and 13.5% magnesium sulfate mass fraction.

[0038] Freeze and crystallize the concentrated mother liquor at 0°C in a low-temperature thermostat to precipitate sodium sulfate decahydrate; filter sodium sulfate decahydrate through a circulating water vacuum pump to obtain solid sodium sulfate decahydrate and filter the mother liquor.

[0039] (2) Get 317mL of the filtered mother liquor obtained in step (1), add distilled water and MgSO 4 ·7H 2 O solid, dilute to a magnesium sulfate solution with a molar concentration of 0.8mol / L; then add NaOH solid according to the molar ratio of magnesium...

Embodiment 3

[0042] Embodiment 3 A kind of method of circulating mother liquor method to prepare basic magnesium sulfate whisker, comprises the following steps:

[0043] (1) 1800g of the mother liquor for the preparation of basic magnesium sulfate whiskers was taken, and concentrated to 610g by evaporation in a universal electric furnace. At this time, the mother liquor contained 12.0% of the sodium sulfate mass fraction and 14.0% of the magnesium sulfate mass fraction.

[0044] Freeze and crystallize the concentrated mother liquor at 3°C ​​in a low-temperature thermostat to precipitate sodium sulfate decahydrate; filter sodium sulfate decahydrate through a circulating water vacuum pump to obtain solid sodium sulfate decahydrate and filter the mother liquor.

[0045] (2) Get 300mL of the filtered mother liquor obtained in step (1), add distilled water and MgSO 4 ·7H 2 O solid, dilute to a magnesium sulfate solution with a molar concentration of 1.1mol / L; then add NaOH solid according to t...

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Abstract

The invention relates to a method for preparing basic magnesium sulfate whiskers by recycling mother liquor. The method comprises the following steps of: (1) concentrating and freezing the mother liquor for preparing the basic magnesium sulfate whiskers to separate sodium sulfate out, and filtering the sodium sulfate to obtain solid sodium sulfate decahydrate and the filtered mother liquor; (2) adding solid MgSO4.7H2O into the filtered mother liquor obtained in the step (1), diluting the mother liquor into solution with distilled water, and adding solid sodium hydroxide (NaOH) with stirring to obtain slurry; (3) transferring the slurry into a magnetic reaction kettle, performing reaction for 6 to 12 hours at the temperature of between 130 and 180 DEG C, and naturally cooling the slurry to the room temperature to obtain white solids; and (4) washing, filtering and drying the white solids in turn to obtain the basic magnesium sulfate whiskers. The method of the invention has the advantages of simple process, low production cost, short cycle, low energy consumption, no pollution and easy realization of large-scale industrial production.

Description

technical field [0001] The invention relates to a production process of whisker materials in the technical field of preparation of inorganic chemical materials, in particular to a method for preparing basic magnesium sulfate whiskers by circulating mother liquor. Background technique [0002] Basic magnesium sulfate whisker is also called magnesium oxysulfide whisker (MOS whisker for short), the chemical formula is MgSO 4 5Mg(OH) 2 ·3H 2 O or MgSO 4 5Mg(OH) 2 2H 2 O, the appearance is white powder, and it is a single needle-shaped or fan-shaped crystal under the microscope. It has many excellent properties and is widely used. It is a hot research topic for many scientific researchers. [0003] my country is a country with large magnesium resources, and the salt lake magnesium resources and magnesite resources are very rich, which provides good conditions for the development of the magnesium salt industry. However, most of the current magnesium salt products are primary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/62C30B7/00C01F5/40
Inventor 乃学瑛卢会刚边绍菊朱东海刘鑫魏明李武
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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