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Calcined clay, preparation method thereof, and limestone calcined clay cement

A technology of calcining clay and limestone, which is applied in the direction of cement production, etc., and can solve problems such as unsustainable and large amount of residual sludge

Active Publication Date: 2020-11-03
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of residual sludge generated every year is relatively large, which greatly exceeds the total capacity of the local dumping ground
And in the long run, none of the above three approaches is sustainable

Method used

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  • Calcined clay, preparation method thereof, and limestone calcined clay cement
  • Calcined clay, preparation method thereof, and limestone calcined clay cement

Examples

Experimental program
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Effect test

preparation example Construction

[0028] see figure 1 , the preparation method of the calcined clay of one embodiment, comprises the steps:

[0029] Step S110: Sieve the residual sludge to remove coarse particles with a particle size greater than 75 μm in the residual sludge to obtain clay powder.

[0030] Remaining mud and slag refers to construction waste such as soil, slag, and materials discarded in various construction projects. Traditional disposal methods of residual sludge include local dumping, local backfilling and construction of constructed wetlands. However, the amount of residual sludge generated every year is relatively large, which greatly exceeds the total capacity of the local dumping ground. According to statistics on the situation of residual sludge in Shenzhen City, the annual production amount reaches hundreds of millions of cubic meters. Due to the limited storage of local residual sludge, most of the residual sludge depends on off-site landfill. However, due to its high uncontrollable...

Embodiment 1

[0067] The preparation process of the calcined clay of the present embodiment is specifically as follows:

[0068] (1) Take 1500g of residual sludge and soil A in a clean beaker, then add 4000mL of pure water to soak for 24 hours, and then fully stir to obtain a sludge suspension.

[0069] (2) After the slag suspension obtained in step (1) is stirred completely, the soil sample solution is poured out in batches through a sieve with a mesh number of 0.075 mm, ensuring that there is no residual mud slag in the original beaker, and the sieve that does not pass The remaining granules are taken out and put into appropriate containers to obtain sieved liquid and unscreened granules.

[0070] (3) Continue to inject 1000mL of pure water into the unsifted granules for stirring, and then sieve through a sieve with a mesh number of 0.075mm to obtain the secondary sieving liquid and unsifted granules. Repeat step (3) three times.

[0071] (4) Pour all the sieving liquid obtained after m...

Embodiment 2

[0074] The preparation process of the calcined clay in this example is similar to the preparation process of the calcined clay in Example 1, the difference is that the sludge residue used in Example 2 is sludge residue B, and the prepared calcined clay is named as Calcined clay B.

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Abstract

The invention relates to calcined clay, a preparation method thereof, and limestone calcined clay cement. The preparation method of the calcined clay comprises the following steps: sieving residual mud and muck, and removing coarse particles with the particle size of more than 75 microns in the residual mud and muck to obtain clay powder; and calcining the clay powder at the temperature of 700-850DEG C to obtain calcined clay. According to the preparation method, the waste residue mud and muck is used as the raw material, so that the residue mud and muck is effectively utilized, and the costof the obtained calcined clay is lower than that of the traditional common kaolin. Besides, coarse particles with the particle size larger than 75 microns in the residual mud and muck are removed, thecontent of kaolinite in the residual mud and muck is increased; the kaolinite becomes metakaolinite after calcination treatment, wherein the kaolinite has volcanic ash activity and can serve as calcined clay to be applied to the preparation process of limestone calcined clay cement, and the strength of the limestone calcined clay cement is improved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to calcined clay, a preparation method thereof and limestone calcined clay cement. Background technique [0002] Limestone calcined clay cement (LC3 cement) is a new type of composite cement material proposed in recent years. This material refers to replacing cement clinker with limestone and calcined clay in a certain proportion, and adding gypsum to make it have the same properties as ordinary silicic acid. Salt cement comparable mechanical properties and good durability. LC3 cement also has the advantages of rapid hydration, high early strength, compact pores, and effective resistance to the intrusion of harmful media. At the same time, because limestone and calcined clay are used to replace cement clinker in a high proportion, it can effectively reduce carbon emissions and meet the requirements of sustainable development. It is an ideal composite cementitious material. The ra...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/38
CPCC04B7/24C04B7/38Y02P40/10
Inventor 刘伟高雪崔宏志梁新文董志君唐路平
Owner SHENZHEN UNIV
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