Modified magnesium sulfate composition, preparation method and applications thereof

A technology of composition and magnesium sulfate, applied in the field of modified magnesium sulfate composition and its preparation, can solve the problems of increasing manufacturing cost and increasing corrosion of steel, and achieve the effects of reducing cost, reducing consumption and reducing pollution

Inactive Publication Date: 2016-02-03
NANJING FORTUNE RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it increases the manufacturing cost; on the other hand, the addi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] (1) According to the mass ratio of sulfuric acid and magnesium oxide of 1:2, take industrial waste acid and magnesium oxide, mix and stir evenly, and cool to room temperature.

[0023] (2) Add 1% of the total mass of attapulgite crystals and 0.5% of the total mass to the mixture obtained in step (1), and stir evenly at a constant temperature of 15°C;

[0024] (3) Stir the mixture obtained in step (2) until the modified magnesium sulfate crystallizes out;

[0025] (4) Separate the modified magnesium sulfate crystals from the mother liquor by suction filtration to obtain the modified magnesium sulfate composition 1-1;

[0026] (5) Recycle the mother liquor obtained in step (4) in step (1).

Example Embodiment

[0027] Example 2

[0028] (1) According to the mass ratio of sulfuric acid and magnesium oxide of 1:3, take industrial waste acid and magnesium oxide, mix and stir evenly, and cool to room temperature.

[0029] (2) Add 0.5% of the total mass of attapulgite crystals and 1% of the total mass to the mixture obtained in step (1), and stir evenly at a constant temperature of 20°C;

[0030] (3) Stir the mixture obtained in step (2) until the modified magnesium sulfate crystallizes out;

[0031] (4) Separate the modified magnesium sulfate crystals from the mother liquor by a filter press method to obtain a modified magnesium sulfate composition 1-2;

[0032] (5) Recycle the mother liquor obtained in step (4) in step (1).

Example Embodiment

[0033] Example 3

[0034] (1) According to the mass ratio of sulfuric acid and magnesium oxide of 1:2.5, take industrial waste acid and magnesium oxide, mix and stir evenly, and then cool to room temperature.

[0035] (2) Add 0.2% of the total mass of attapulgite crystals and 0.5% of the total mass to the mixture obtained in step (1), and stir evenly at a constant temperature of 25°C;

[0036] (3) Stir the mixture obtained in step (2) until the modified magnesium sulfate crystallizes out;

[0037] (4) Separating the modified magnesium sulfate crystals from the mother liquor by a filter press method to obtain a modified magnesium sulfate composition 1-3;

[0038] (5) Recycle the mother liquor obtained in step (4) in step (1).

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PUM

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Abstract

The invention relates to a modified magnesium sulfate composition, a preparation method and applications thereof. The composition is composed of the following components in percentage by weight: 90 to 99.5% of magnesium sulfate, 0.2 to 5% of attapulgite crystal, and 0.3 to 5% of cellulose. The preparation method comprises the following steps: mixing heavy acid with magnesium oxide, stirring, adding attapulgite crystal and cellulose, evenly stirring, and carrying out crystallization to obtain the modified magnesium sulfate composition. The obtained composition can be used to prepare magnesium oxysulfate cement, the manufacture cost can be reduced, the compatibility among components in cement is increased, and the corrosive property to steel is reduced.

Description

technical field [0001] The invention relates to a cement additive composition and its preparation method and application, in particular to a modified magnesium sulfate composition and its preparation method and application. Background technique [0002] Magnesium cement is made of lightly calcined powder obtained by calcining magnesite or ash powder obtained by calcining dolomite at low temperature (the main component is MgO) as a cementing agent, and magnesium chloride hexahydrate (MgCl 2 ·6H 2 O) and other water-soluble magnesium salts are used as blending agents, and water is added to form light-burned magnesium powder and magnesium chloride hexahydrate as the main raw materials. Therefore, in general, magnesium cement refers to magnesium oxychloride cement. [0003] The main component of the hardened body formed by magnesium cement is 5Mg (OH) 2 · MgCl 2 ·8H 2 O and 3Mg(OH) 2 · MgCl 2 ·8H 2 Magnesium oxide-magnesium chloride-water ternary compound crystal phase do...

Claims

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Application Information

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IPC IPC(8): C04B26/28
Inventor 祁守岗朱曼莉缪亮
Owner NANJING FORTUNE RECYCLING TECH
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