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A kind of ultra-fine carbonate tailings-based active material and its preparation method and application as cement material

A carbonate type, cement material technology, applied in cement active material, cement material application field, can solve the problems of low raw material cost, low utilization rate of ultra-fine tailings, safety, etc., achieve low energy consumption, good hydration Active, cost-reducing effect

Active Publication Date: 2021-06-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the low utilization rate of ultra-fine tailings in heavy metal tailings ponds in the prior art, and excessive accumulation causing environmental and safety problems, the first purpose of the present invention is to provide a method for utilizing ultra-fine carbonate tailings through simple high-temperature activation A method for preparing ultrafine carbonate-type tailings-based active materials, the method is simple, low in energy consumption, low in raw material costs, conducive to industrial production, and can realize the recycling, reduction and harmlessness of bulk industrial solid waste, Expand the market for industrial waste slag building materials, protect the surrounding and underground ecological environment of the tailings reservoir area

Method used

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  • A kind of ultra-fine carbonate tailings-based active material and its preparation method and application as cement material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of ultrafine carbonate type tailings-based active material:

[0028] (1) Take 5Kg of raw material ultra-fine carbonate tailings in an iron container, put it into a 105°C blast drying oven to dry to constant weight, and then pass the massive tailings dried to constant weight through a jaw crusher , crush the tailings to less than 5mm, and finally pass the crushed tailings through a 0.9mm square-hole sieve to obtain dry ultrafine carbonate tailings powder.

[0029] (2) Take 300g of ultra-fine carbonate tailings powder and spread it in an iron pan with a length and width of 25cm×20cm, respectively calcinate at 750°C for 40min at a constant temperature (the heating time is not included), and then naturally cool.

[0030] (3) The ultrafine carbonate-type tailings-based active material that has been calcined and activated is put into an airtight bag, sealed and dried, and the mass loss is weighed.

[0031] Activity evaluation:

[0032]The above activate...

Embodiment 2

[0035] A preparation method of ultrafine carbonate tailings-based active material:

[0036] (1) Take 5Kg of ultra-fine carbonate tailings as raw materials in an iron container, put them in a blast drying oven at 105°C and dry them to a constant weight, and then pass the massive tailings dried to a constant weight through a jaw crusher , crush the tailings to less than 5mm, and finally pass the crushed tailings through a 0.9mm square hole sieve to obtain dry ultrafine carbonate tailings powder.

[0037] (2) Take 300g of ultra-fine carbonate tailings powder and lay it flat on an iron plate with a length and width of 25cm×20cm, and then calcine at a constant temperature of 750°C for 80min (the heating time is not included) and then cool naturally.

[0038] (3) Put the calcined and activated ultrafine carbonate tailings-based active material into a sealed bag and store it in a sealed and dry place, and weigh the mass loss.

[0039] Activity evaluation:

[0040] The above activat...

Embodiment 3

[0043] A preparation method of ultrafine carbonate tailings-based active material:

[0044] (1) Take 5Kg of ultra-fine carbonate tailings as raw materials in an iron container, put them in a blast drying oven at 105°C and dry them to a constant weight, and then pass the massive tailings dried to a constant weight through a jaw crusher , crush the tailings to less than 5mm, and finally pass the crushed tailings through a 0.9mm square hole sieve to obtain dry ultrafine carbonate tailings powder.

[0045] (2) Take 300g of ultra-fine carbonate tailings powder and lay it flat on an iron plate with a length and width of 25cm×20cm, and then calcine at a constant temperature of 800°C for 40min (the heating time is not included) and then cool naturally.

[0046] (3) Put the calcined and activated ultrafine carbonate tailings-based active material into a sealed bag and store it in a sealed and dry place, and weigh the mass loss.

[0047] Activity evaluation:

[0048] The above activat...

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Abstract

The invention discloses an ultrafine carbonate tailings-based active material, a preparation method thereof and an application as a cement material. The ultrafine carbonate tailings are dried and crushed and placed at 750°C to 850°C Calcination treatment is carried out to obtain ultra-fine carbonate-type tailings-based active materials; this active material has good hydration activity, can replace some high-performance sulphoaluminate cement applications, and greatly reduces the sulphoaluminate cement The use cost is low, and the preparation process is simple, the cost is low, and the energy consumption is low, which is beneficial to industrial production.

Description

technical field [0001] The invention relates to a cement active material, in particular to an active material obtained by processing ultrafine carbonate tailings, a preparation method and application as a cement material, and belongs to the technical field of resource utilization of industrial solid waste materials . Background technique [0002] Mining selection and mineral processing provide a lot of valuable resources for China's industrial production and economic development, and play an indispensable role. However, a large amount of tailings will also be left in the process of mining and processing. Residual waste after separation. It is a kind of industrial solid waste of mine mining and selection. The usual disposal method is to store it in a specially opened tailings pond, or use cement and other cementitious materials to cement tailings in the goaf and backfill. The above disposal methods all occupy a large amount of land resources. , tailings ponds will lead to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/32C04B7/38C04B7/40C04B7/44
CPCC04B7/24C04B7/32C04B7/38C04B7/40C04B7/44Y02P40/10
Inventor 侯浩波罗腾谢巍朱华万沙郑凡李嘉豪董祎挈
Owner WUHAN UNIV
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