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Activity optimization method of iron tailing powder used as concrete mineral admixture

A technology for mineral admixtures and iron tailings powder, which is applied in the field of activity optimization of iron tailings powder, can solve the problems of difficulty in wide-scale promotion of results, high energy consumption of iron tailings powder, complicated technology, etc. The effect of promotion, beneficial to industrial production, and significant technical effect

Active Publication Date: 2020-06-09
HEBEI AGRICULTURAL UNIV. +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In "The Activation Process and Mechanism of Iron Tailings Powder and Its Effect on Concrete Properties", the chemical activation was selected by comparing mechanical grinding and chemical activation, but the activation efficiency of this method was not high, only increased by 5%. Chemical activators have the potential to adversely affect the durability of concrete
[0011] However, the above two articles only studied the activity and activation method of iron tailings powder, and did not give the optimization range suitable for engineering.
[0012] To sum up, it can be seen that most of the existing technologies focus on simply pursuing the high activity of iron tailings powder, and the technologies used are either relatively complicated or have a high degree of grinding, which leads to high energy consumption and high cost of iron tailings powder, making it difficult to obtain results in the future. Therefore, it is urgent to study a method for optimizing the activity of iron tailings powder that can replace fly ash and has low energy consumption and low cost, so as to be used as a concrete mineral admixture

Method used

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  • Activity optimization method of iron tailing powder used as concrete mineral admixture
  • Activity optimization method of iron tailing powder used as concrete mineral admixture
  • Activity optimization method of iron tailing powder used as concrete mineral admixture

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Experimental program
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Effect test

Embodiment 1

[0060] The first step is to pass the iron tailings through a 3mm sieve, dry at 105°C for 1 hour, and use a cement test mill for 7min, 10min, 12min, 15min, 25min, 35min cascade mechanical grinding to obtain iron tailings of different fineness Mineral powder, code-named Z1, Z2, Z3, Z4, Z5, Z6. The obtained powder specific surface area is shown in Table 1:

[0061]

[0062] Table 1

[0063] In the second step, a pozzolanic test was carried out on the above-mentioned iron tailings powders Z1-Z6 with different specific surface areas, and the results obtained through chemical analysis are shown in Table 2:

[0064]

[0065]

[0066] The analysis results show that the test points corresponding to the ages of the ground raw ore iron tailings powders of different finenesses all fall above the standard curve, indicating that the mechanically ground iron tailings powders are not pozzolanic or unqualified for pozzolanic properties, and are inert. Material, that is, iron tailing...

Embodiment 2

[0071] In order to prove that the iron tailings powder specific surface area is set to 450m by mechanical activation method in the present invention 2 / kg-550m 2 / kg, as the effectiveness of concrete mineral admixture, in the present invention, the iron tailings powder is mechanically-chemically activated, and ground to a specific surface area of ​​450㎡ / ㎏, wherein the cost of using the chemical activator is relatively low desulfurization gypsum, the obtained activity index is shown in Image 6 . The analysis results show that: when the gypsum content is 0.3%, the activity of the iron tailings powder is stimulated to the greatest extent, and the activity index reaches 74.46%. , the activity of mechanical-chemical activation of iron tailings powder is 4.2 percentage points higher than that of mechanical activation of iron tailings powder. It can be seen that the improvement efficiency is not high, that is, mechanical-chemical activation of iron tailings powder has no obvious a...

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Abstract

The invention relates to an activity optimization method of iron tailing powder used as a concrete mineral admixture. The method comprises the following steps: carrying out mortar activity test on iron tailing powder with different specific surface areas under the same doping amount, and summarizing the change rule of the compressive strength of a mortar test piece, namely the activity index of the iron tailing powder, in the mortar activity test according to increase of the specific surface area; after comparison with the activity index of fly ash under the same mixing amount, determining theoptimal powder specific surface area of the iron tailing powder; on the basis that the iron tailing powder is utilized to the maximum extent and it is guaranteed that the activity of the iron tailingpowder is not lower than that of fly ash under the same doping amount, determining the optimal doping amount of the iron tailing powder. The activity of the specific surface area of the iron tailingpowder determined by the method is higher than that of fly ash, the iron tailing powder can completely replace fly ash to serve as the concrete admixture, and the iron tailing powder has the advantages of low energy consumption, high activity and capable of faciliting industrial production and large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of concrete preparation by utilizing industrial solid waste, in particular to an activity optimization method of iron tailings powder used as concrete mineral admixture. Background technique [0002] At present, concrete is the most important and widely used building material, and its main admixture is fly ash. In recent years, with the stricter restrictions on coal-fired power plants in the country, the output of fly ash has been decreasing, and the price Higher and higher, resulting in an increasing shortage of mineral admixtures for concrete. [0003] However, the existing iron tailings are piled up in large quantities. Although scholars at home and abroad have conducted a large number of research experiments on the application of waste rock and tailings in the field of concrete and achieved many results, they mainly focus on tailings as coarse aggregate and tailings sand as fine aggregate. Aggregate, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C60/00C04B18/12C04B20/02
CPCG16C60/00C04B18/12C04B20/026Y02W30/91
Inventor 杨明镜孙建恒孟志良马馨鑫敦晨阳段雅静李红梅王军林
Owner HEBEI AGRICULTURAL UNIV.