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A kind of magnesium oxysulfide cement

A technology of magnesium oxysulfide cement and magnesium sulfate, which is applied in the field of building materials to achieve the effects of no shrinkage of strength, high early strength, and increased coagulation and hardening speed

Active Publication Date: 2019-08-06
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as pointed out in an article "Modification Effect of Citric Acid on Magnesium Oxygen Sulfate Cement" in the fourth issue of Volume 36 of the Journal of Hefei University of Technology, although citric acid improves its mechanical strength, it greatly delays its setting time.

Method used

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  • A kind of magnesium oxysulfide cement
  • A kind of magnesium oxysulfide cement
  • A kind of magnesium oxysulfide cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The lithium and magnesium slag extracted from the salt lake comes from CITIC Guoan Group Corporation, the chemical composition of which is shown in Table 1, and the XRD test is as follows: figure 1 as shown, figure 1 The analysis shows that the slag of lithium and magnesium extracted from salt lake is mainly magnesium hydroxide and magnesium borate, and there is also a small amount of magnesium oxide.

[0028] Table 1: Chemical composition of lithium and magnesium slag extracted from salt lake

[0029]

[0030] LOI*: is the weight loss of lithium and magnesium slag extracted from salt lake at 1000℃.

[0031] Preparation of magnesium oxysulfide cement:

[0032] Activated magnesium oxide powder was obtained by calcining the lithium-magnesium slag extracted from the salt lake at 600° C. for 3 hours.

[0033] Mix 100 parts of light-burned magnesite powder, 1 part of phosphorus pentoxide, and 90 parts of magnesium sulfate with a mass percentage of 25%, harden for 3 day...

Embodiment 2

[0036] The extraction of lithium and magnesium slag from the salt lake is the same as in Example 1.

[0037] Preparation of magnesium oxysulfide cement:

[0038] Activated magnesium oxide powder was obtained by calcining the lithium-magnesium slag extracted from the salt lake at 400°C for 6 hours.

[0039] Mix 50 parts of light-burned magnesite powder, 1 part of phosphorus pentoxide and 140 parts of magnesium sulfate with a mass percentage of 25%, harden for 2 days, crush and grind, and dry at 40°C for 24 hours to obtain a basic magnesium sulfate precursor .

[0040] 50 parts of active magnesium oxide powder, 50 parts of magnesium sulfate heptahydrate, 1 part of phosphorus pentoxide, and 10 parts of basic magnesium sulfate precursor were mixed and ground through a 100-mesh sieve to obtain rapid hardening magnesium oxysulfide cement.

Embodiment 3

[0042] The extraction of lithium and magnesium slag from the salt lake is the same as in Example 1.

[0043] Preparation of magnesium oxysulfide cement:

[0044] Activated magnesium oxide powder was obtained by calcining the lithium-magnesium slag extracted from the salt lake at 900° C. for 1 hour.

[0045] Mix 100 parts of light-burned magnesite powder, 0.5 parts of phosphorus pentoxide and 70 parts of magnesium sulfate with a mass percentage of 25%, harden for 2 days, crush and grind, and dry at 40°C for 24 hours to obtain a basic magnesium sulfate precursor .

[0046] 100 parts of activated magnesium oxide powder, 50 parts of magnesium sulfate heptahydrate, 2 parts of sodium formate, and 5 parts of basic magnesium sulfate precursor were mixed and ground through a 100-mesh sieve to obtain rapid hardening magnesium oxysulfate cement.

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Abstract

The invention discloses a magnesium oxysulfate cement. The magnesium oxysulfate cement is composed of, by mass, 50 to 100 parts of active magnesium oxide powder, 30 to 100 parts of Magnesium sulfate heptahydrate, 0.05 to 2 parts of an additive, 0.5 to 10 parts of a magnesium oxysulfate precursor. According to a preparation method, the above raw materials are mixed and grinded, and are sieved using a mesh of 100 to 200 meshes so as to obtain the rapid hardening magnesium oxysulfate cement. According to the preparation method, active magnesium oxide powder is obtained low temperature calcining of salt lake extracted magnesium lithium carbonate slag, so that a novel raw material source is provided for production of the rapid hardening magnesium oxysulfate cement; adding of the magnesium oxysulfate precursor is capable of accelerating the hardening speed of the magnesium oxysulfate cement, the obtained magnesium oxysulfate cement is high in early strength, and reduction of later strength is avoided.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a magnesium oxysulfide cement. Background technique [0002] Magnesium oxysulfate cement belongs to an air-hardening magnesia material, which is usually an inorganic gelling material produced by mixing magnesium oxide and magnesium sulfate solution. [0003] Compared with ordinary portland cement, magnesium oxysulfate cement has the characteristics of light weight and good decorative performance. However, magnesium oxysulfide cement without any admixture is prone to cracking and low strength. Therefore, the research on the modification of magnesium oxysulfide cement in recent years is how to improve its mechanical strength. Chinese patent application 200510048574.7 discloses a magnesium sulfate lime cement, which essentially adds citric acid to the magnesium sulfate cement system. However, as pointed out in the "Modification Effect of Citric Acid on Magnesium Oxygen Sulfate C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B9/04C04B9/20
CPCC04B9/04C04B9/20
Inventor 吴成友余红发
Owner QINGHAI UNIVERSITY
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