Method for recycling magnesium oxysulfate building material waste based on magnesite tailings and product

A technology for magnesite tailings and magnesium oxysulfide, which is applied in the field of recycling of magnesite oxysulfide building materials waste based on magnesite tailings, can solve problems such as waste of magnesite resources, and achieve long service life, uniform quality and high strength. Effect

Active Publication Date: 2019-06-18
辽宁科大中驰镁建材科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to provide a method for recycling magnesium oxysulfide building material waste based on magnesite tailings, so as to solve the problem of a large amount of waste of magnesite resources in the prior art;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method of carrying out magnesium oxysulfide building material waste recycling based on magnesite tailings described in this embodiment comprises the following steps:

[0027] (1) Collect magnesium oxysulfide cement-based material waste for recycling, use a jaw crusher for coarse grinding, and use a vertical mill for grinding, and then heat the powder through a flue at 100°C to obtain an activated powder;

[0028] (2) Take 25kg of low-grade magnesite tailings lightly burned magnesia powder, 10.5kg of industrial grade magnesium sulfate heptahydrate powder, activator SW4kg, 0.3kg of sodium dodecylbenzenesulfonate, and 0.2kg of sodium silicate and mix them evenly. Obtain a gel material; and add 60kg of the above-mentioned activated powder and 5kg of water and stir and mix to obtain a slurry;

[0029] (3) The above-mentioned slurry is molded, and after 28 days of natural curing, the required building products are obtained.

Embodiment 2

[0031] The method of carrying out magnesium oxysulfide building material waste recycling based on magnesite tailings described in this embodiment comprises the following steps:

[0032] (1) Collect magnesium oxysulfide cement-based material waste for recycling, use a jaw crusher for coarse grinding, and use a vertical mill for grinding, and then heat the powder through a flue at 200°C to obtain an activated powder;

[0033] (2) Take low-grade magnesite tailings light-burned magnesia powder 21.8kg, industrial grade magnesium sulfate heptahydrate powder 9.2kg, activator SW 3.5kg, water reducing agent 0.3kg, early strength agent 0.2kg and mix evenly to obtain Adhesive material; And add above-mentioned activation powder 65kg, water 10kg and stir and mix and make slurry;

[0034] (3) The above-mentioned slurry is molded, and after 28 days of natural curing, the required building products are obtained.

Embodiment 3

[0036] The method of carrying out magnesium oxysulfide building material waste recycling based on magnesite tailings described in this embodiment comprises the following steps:

[0037] (1) Collect magnesium oxysulfide cement-based material waste for recycling, use a jaw crusher for coarse grinding, and use a vertical mill for grinding, and then heat the powder through a flue at 300°C to obtain an activated powder;

[0038] (2) Take 18.8kg of low-grade magnesite tailings light-burned magnesia powder, 7.8kg of industrial grade magnesium sulfate heptahydrate powder, 3kg of activator SW, 0.2kg of sodium dodecylbenzenesulfonate, and 0.2kg of sodium silicate. Uniformly, obtain gel material; And add above-mentioned activation powder 70kg, water 15kg stir and mix and make slurry;

[0039] (3) The above-mentioned slurry is molded, and after 28 days of natural curing, the required building products are obtained.

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Abstract

The invention belongs to the technical field of building waste recycling, particularly relates to a method for recycling magnesium oxysulfate building material waste based on magnesite tailings, and further discloses a product prepared from the waste. According to the method for recycling the magnesium oxysulfate building material waste based on the magnesite tailings, magnesium oxysulfate building materials are heated and activated by a flue, performances of gel materials of the magnesite tailings are assisted, the compressive strength of a prepared building material product reaches 42.5MPa or more, a softening coefficient reaches up to 0.9 or more, and the product has the advantages of high strength and good water resistance, rapidness in hardening, easiness in strength and the like andcan be used for repairing materials. The product is uniform in quality, stable in performance and long in service life, main materials of the product include more than 95% of the waste, the recyclingrate of the magnesium oxysulfate building material waste can reach 90%, the method is economical and environmentally friendly, energy is saved, emission is reduced, the magnesium oxysulfate building material waste is recycled, waste accumulation of low-grade magnesite tailings is treated, magnesium sulfate produced by waste acid is used and the like.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of construction waste, and in particular relates to a method for recycling magnesium oxysulfide building material waste based on magnesite tailings, and further discloses the obtained product. Background technique [0002] With the continuous development of economic construction, building materials play an important role, and many new building materials are continuously derived. However, at present, my country's building materials industry is still in the "extensive" mode. Not only in the production process, there are widespread problems of low efficiency, high pollution, and high consumption. What is more serious is that the improper disposal of many building material wastes not only leads The ecological environment has been severely damaged, and the resource and energy utilization efficiency is low. With the requirements of today's "energy saving and emission reduction" environment, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30
Inventor 毕万利胡智淇关岩常钧赵九野滕莹雪孟宪章孙美硕
Owner 辽宁科大中驰镁建材科技有限公司
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