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Iron tailing activation method and multi-solid-waste iron tailing concrete

A technology for waste concrete and iron tailings, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as time-consuming and cost-consuming, resource-consuming, and average effect

Inactive Publication Date: 2021-07-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing activation methods for iron tailings include mechanical activation, chemical activation, and thermal activation. If iron tailings are not pretreated and directly mechanically activated, it will take a lot of time and cost, and the effect is mediocre; Scholars have carried out chemical activation of iron tailings, but the effect is not very significant due to unreasonable selection of activators; thermal activation is better, but it will consume a lot of resources and pollute the environment

Method used

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  • Iron tailing activation method and multi-solid-waste iron tailing concrete
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  • Iron tailing activation method and multi-solid-waste iron tailing concrete

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Effect test

Embodiment 1

[0026] An iron tailings activation method, the multi-solid waste admixture includes the following raw materials in parts by weight, 30 parts of iron tailings powder, 10 parts of calcium phase admixture, 10 parts of aluminum phase admixture, 5 parts of composite activator, 1 part of grinding aid.

[0027] The calcium phase admixture is calcium carbide slag with a CaO content of 68%;

[0028] The aluminum phase admixture is coal gangue, Al 2 o 3 Content 28%;

[0029] The composite activator is a mixture of NaOH solution with a mass fraction of 30% and liquid sodium silicate with a modulus of 2.2-2.5 and a Baume degree of 38-45Be in a ratio of 1:2;

[0030] The grinding aid is triethanolamine.

[0031] A method for activating iron tailings, comprising the following steps:

[0032] Step 1: Mix a certain amount of iron tailings powder, calcium phase admixture and aluminum phase admixture in a ratio of 3:1:1, place it in an industrial microwave oven with a frequency of 2450MHz,...

Embodiment 2

[0045] An iron tailings activation method, the multi-solid waste admixture includes the following raw materials in parts by weight, 20 parts of iron tailings powder, 10 parts of calcium phase admixture, 10 parts of aluminum phase admixture, 4 parts of composite activator, 2 parts of grinding aid.

[0046]The calcium phase admixture is papermaking white mud, with a CaO content of 42%;

[0047] The aluminum phase admixture is lithium slag, Al 2 o 3 Content 21%;

[0048] The composite activator is a mixture of NaOH solution with a mass fraction of 30% and liquid sodium silicate with a modulus of 2.2-2.5 and a Baume degree of 38-45Be in a ratio of 1:2;

[0049] The grinding aid is desulfurized gypsum.

[0050] A method for activating iron tailings, comprising the following steps:

[0051] Step 1: Mix a certain amount of iron tailings powder, calcium-phase admixture and aluminum-phase admixture in a ratio of 2:1:1, place it in an industrial microwave oven with a frequency of 2...

Embodiment 3

[0064] An iron tailings activation method, the multi-solid waste admixture includes the following raw materials in parts by weight, 20 parts of iron tailings powder, 15 parts of calcium phase admixture, 15 parts of aluminum phase admixture, 4 parts of composite activator, 2 parts of grinding aid.

[0065] The calcium phase admixture is desulfurization ash 62%;

[0066] The aluminum phase admixture is ceramic powder 36%;

[0067] The composite activator is a mixture of NaOH solution with a mass fraction of 30% and liquid sodium silicate with a modulus of 2.2-2.5 and a Baume degree of 38-45Be in a ratio of 1:2;

[0068] The grinding aid is one or a mixture of triethanolamine and desulfurized gypsum.

[0069] A method for activating iron tailings, comprising the following steps:

[0070] Step 1: Mix a certain amount of iron tailings powder, calcium-phase admixture and aluminum-phase admixture in a ratio of 4:3:3, place it in an industrial microwave oven with a frequency of 245...

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Abstract

The invention belongs to the technical field of building material and solid waste resource utilization, and relates to an iron tailing activation method and iron tailing-containing multi-solid-waste concrete. A multi-solid-waste admixture comprises 20-30 parts of iron tailing powder, 10-15 parts of a calcium phase admixture, 10-15 parts of an aluminum phase admixture, 4-5 parts of a composite activator, and 1-2 parts of a grinding aid. The multi-solid-waste admixture is used as an auxiliary cementing material, and each cubic meter of the multi-solid-waste concrete is prepared from the following components in proportion: 310-336 kg of cement, 144-170 kg of the multi-solid-waste admixture, 492-517 kg of machine-made sand, 221-281 kg of natural sand, 1020-1055 kg of machine-made stone, 1.2-1.5% of an air-entraining and water-reducing agent (with respect to the total amount of the cementing material) and 177-186 kg of water. The iron tailings are activated in a composite activation mode of microwave irradiation, mechanical grinding and chemical excitation, the activity index of the admixture can be well increased, a large amount of solid waste is used, the comprehensive utilization rate of the iron tailings is increased, consumption of natural resources is reduced, and the concrete is more environmentally friendly.

Description

technical field [0001] The invention relates to an activation method of iron tailings and multi-solid waste iron tailings concrete, belonging to the technical field of resource utilization of building materials and solid waste. Background technique [0002] According to statistics, there are more than 9,000 tailings in my country, and nearly 5 billion tons of tailings are stockpiled, which will generate a large amount of tailings, and the utilization rate of tailings in my country is low, and most of them are in a piled state, which not only occupies land, but also Bring management and other costs. Most of the waste rocks produced by mining tailings contain heavy metals, and long-term accumulation will seep into the groundwater layer, pollute the groundwater source, and affect the surrounding environment. At this stage, how to utilize tailings has become a hot topic. If tailings are applied to building materials, it can reduce costs and solve the problem of iron tailings acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/14C04B18/12C04B28/00
CPCC04B40/0046C04B18/12C04B28/00C04B2201/50Y02W30/91
Inventor 顾晓薇李晓慧张伟峰王青胥孝川
Owner NORTHEASTERN UNIV
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