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Composite activated iron tailing sand auxiliary cementing material and preparation method thereof

A technology for assisting cementitious materials and iron tailings sand, applied in cement production and other directions, can solve the problems of single process, low efficiency and poor activation effect.

Pending Publication Date: 2017-10-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and further provide a composite activated iron tailings sand auxiliary cementitious material and its preparation method, so as to solve the technical problems of single process, low efficiency and poor activation effect in the existing method At the same time, expand the promotion and application of iron tailings auxiliary cementitious materials to realize the sustainable utilization of industrial solid waste

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  • Composite activated iron tailing sand auxiliary cementing material and preparation method thereof

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preparation example Construction

[0026] A preparation method for composite activated iron tailings auxiliary cementitious material, comprising the following steps,

[0027] Step 1. Selection of fine iron tailings: select SiO 2 Iron tailings with a content of 65% to 85% are screened with a square hole sieve, and fine iron tailings with a particle size of 0.075mm to 0.6mm are selected as activation targets to prepare auxiliary cementitious materials;

[0028] Step 2, mechanical grinding and activation: using a cement ball mill, the ball-to-material ratio is 3:1 to 8:1, and the grinding time is 1h to 3h, mechanically grinding the iron tailings to obtain primary activated iron tailings;

[0029] Step 3, chemical activation: adding Na 2 SiO 3 or Na 2 CO 3 Alkali metal silicate or carbonate chemical additives for chemical activation, the blending ratio of chemical additives is 0.5% to 3% of the content of the primary activated iron tailings to obtain secondary activated iron tailings;

[0030] Step 4. Thermody...

Embodiment 2

[0033] Choose SiO 2 The iron tailings with a content of 65% to 85% are screened with a square hole sieve, and the fine iron tailings with a particle size of 0.075mm to 0.6mm are selected as the activation target. First, a cement ball mill is used for mechanical grinding. The ball-to-material ratio is 3:1, and the grinding time is 3 hours to obtain primary activated iron tailings; then add 2% Na in the primary activated iron tailings 2 CO 3 Carry out chemical activation to obtain secondary activated iron tailings; finally, mix the secondary activated iron tailings with slag powder at a ratio of 2:1, and continue thermal activation treatment at 750°C for 3 hours to obtain the final composite activated iron tailings sand auxiliary glue condensate material.

Embodiment 3

[0035] Choose SiO 2The iron tailings with a content of 65% to 85% are screened with a square hole sieve, and the fine iron tailings with a particle size of 0.075mm to 0.6mm are selected as the activation target. First, a cement ball mill is used for mechanical grinding. The ball-to-material ratio is 6:1, and the grinding time is 1.5 hours to obtain primary activated iron tailings; then add 1% Na in the primary activated iron tailings 2 SiO 3 Carry out chemical activation to obtain secondary activated iron tailings; finally, mix the secondary activated iron tailings with limestone powder at a ratio of 1:1, and continue thermal activation treatment at 600°C for 2.5 hours to obtain the final composite activated iron tailings auxiliary sand gelling material.

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Abstract

The invention discloses a composite activated iron tailing sand auxiliary cementing material and a preparation method thereof. The technical problems that the fine iron tailing sand activation process is single, low in efficiency and poor in activation effect are mainly solved. The composite activated iron tailing sand auxiliary cementing material is prepared by mixing and activating high-silicon type fine iron tailing, chemical additives and active substances. The invention also discloses a preparation method of the composite activated iron tailing sand auxiliary cementing material. The preparation method comprises a mechanical grinding, chemical activation and thermodynamic activation composite activation process. The preparation method of the composite activated iron tailing sand auxiliary cementing material has the beneficial effects that the activity of the high-silicon type fine iron tailing can be effectively excited, the iron tailing subjected to composite activation can serve as an auxiliary cementing material for cement concrete and related components thereof, the comprehensive utilization rate of the iron tail is increased, environmental pollution and ecological damage are reduced, and a promoting effect on sustainable development of resources is excellent.

Description

technical field [0001] The invention relates to the technical field of civil engineering materials, in particular to a composite activated iron tailing sand auxiliary cementitious material and a preparation method thereof. Background technique [0002] With the development of China's iron and steel industry and the improvement of beneficiation technology, the output of iron tailings is increasing year by year. Iron tailings are the iron ore that the iron beneficiation plant grinds iron ore finely and selects "useful components" under specific economic and technical conditions. The solid or powdery residue discharged after separation. At present, the stockpiling of iron tailings in my country has exceeded 3 billion tons, and it is increasing at a rate of more than 300 million tons every year. However, its stockpiling will occupy a large amount of land and pollute the environment. Destroying the ecology, what's more, some tailings ponds still have the risk of catastrophic water ...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/43C04B7/42
CPCC04B7/243C04B7/427C04B7/43Y02P40/10
Inventor 董泽蛟杨晨李新凯郗凤明
Owner HARBIN INST OF TECH
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