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Magnesium sulfite cement and preparation method thereof

A technology of magnesium sulfite and manufacturing method, applied in the field of cement and its manufacturing, to achieve the effects of low overall production cost, cheap price and low production cost

Inactive Publication Date: 2015-05-06
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Magnesium oxide flue gas desulfurization will produce a large amount of magnesium sulfite. If it is directly used in cement production without oxidation, it will produce very good economic benefits. However, no one has tried to use magnesium sulfite directly as a raw material for cement production.

Method used

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  • Magnesium sulfite cement and preparation method thereof
  • Magnesium sulfite cement and preparation method thereof
  • Magnesium sulfite cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0039] Preparation example (magnesium oxide method flue gas desulfurization produces magnesium sulfite raw material)

[0040] The desulfurizer magnesium oxide powder is added to industrial tap water to make desulfurizer slurry-magnesium hydroxide slurry, and pumped to the desulfurization tower for absorbing sulfur dioxide in the flue gas in the sulfur dioxide absorption spray area.

[0041] The flue gas from the coal-fired boiler of the power plant (adjusting the oxygen content to 6vt%) enters the interior of the desulfurization tower from the lower part of the desulfurization tower. During the rising process of the flue gas, it is in contact with the sulfur dioxide absorption spray area, and the flue gas is discharged from the top of the desulfurization tower. The sulfur dioxide absorption spraying area sprays desulfurizer slurry to absorb sulfur dioxide in the flue gas.

[0042] Magnesium sulfite-containing absorption product formed by the desulfurizer slurry after absorbin...

Embodiment 1-5

[0050] Mix the above-mentioned magnesium sulfite raw material with the additive (sodium dihydrogen phosphate) in proportion, add 250mL of water during the mixing process, then add magnesium oxide, fly ash and steel slag in sequence in proportion, and grind it into 300 mesh in a ball mill, and discharge That is, magnesium sulfite cement is obtained. See the table below for detailed parameters.

[0051]

[0052]

[0053] Add 0.9 kg of water to the above magnesium sulfite cement, and stir in a mixer to obtain a cement slurry. Put this slurry into a mold with a size of 30×30×120 mm to make a cement test block. After the specified number of days of curing, test according to the GB177-85 method, and the results are shown in the table below.

[0054]

[0055]

[0056]

[0057] Add 0.8 kg of water to the magnesium sulfite cement, and stir evenly to prepare cement slurry. Put this slurry into a mold with a size of 30×30×120 mm to make a cement test block. Let it stand ...

Embodiment 1

[0058] The product of Example 1 has a maximum temperature of 180° C. during curing. The product is immersed in water for 24 hours, and then placed in a dry environment at 30°C for 24 hours, a total of 5 cycles, and the dissolution rate does not exceed 4%. This shows that magnesium sulfite and magnesium oxide have a significant protective effect on the 517 crystal phase (basic magnesium sulfate cement).

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Abstract

The invention discloses cement and a preparation method thereof, and particularly relates to cement employing magnesium sulfite as a main component and a preparation method of the cement. The cement comprises magnesium sulfite and magnesium oxide. The cement disclosed by the invention has good water resistance and stability. In addition, the amount of the magnesium sulfite generated by flue gas desulfurization in a power plant is much greater than that of magnesium sulfate; the raw materials are relatively available; and the price is relatively low, so that the overall production cost of the cement is relatively low; and the economic benefits are extremely high.

Description

technical field [0001] The invention relates to a cement and a manufacturing method thereof, in particular to a cement with magnesium sulfite as the main component and a manufacturing method thereof. Background technique [0002] Conventional cements include magnesium oxysulfide cement or magnesium oxychloride cement and Sorel cement and the like. Patent document CN1156701A discloses that magnesium sulfate can be used as an expansion agent for cement, and its mixing amount is 0.3-4.0% of the cement weight. Patent document CN 102701616A discloses a high-strength magnesia fly ash clinker-free cement, including 100 parts of fly ash; 30-40 parts of light-burned magnesium oxide; 10-15 parts of magnesium sulfate heptahydrate; calcium sulfate, ferrous sulfate Or 1-5 parts of aluminum sulfate; 0.5-1.0 parts of phosphoric acid or phosphoric acid; 50-100 parts of water. Patent document CN102924038A discloses a modified magnesium oxysulfide cement, comprising 100 parts of magnesium o...

Claims

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Application Information

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IPC IPC(8): C04B9/04C04B9/06
Inventor 童裳慧
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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