Alkali-activated cementing material and preparation method thereof

A technology of cementitious materials and alkali excitation, applied in cement production and other directions, can solve problems such as limited source of raw materials, environmental pollution, waste of resources, etc., and achieve the effect of expanding comprehensive utilization of resources, expanding sources of raw materials, and saving production costs.

Inactive Publication Date: 2015-03-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides an alkali-activated gelling material prepared from siliceous iron tailings as the main raw material and its preparation method, which expands the comprehensive utilization of iron tailings and solves the environmental pollution and resource pollution caused by the...

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  • Alkali-activated cementing material and preparation method thereof
  • Alkali-activated cementing material and preparation method thereof
  • Alkali-activated cementing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Effects of different proportions of composite powder on the properties of alkali-activated gelling materials with iron tailings as the main raw material.

[0037] First, mix industrial water glass (water content 64%) with a modulus n of 3.3 and chemically pure NaOH at a weight ratio of 1:0.1, stir at room temperature to adjust the modulus n of the water glass to 1.5, and detect different proportions of the composite powder Influence on the mechanical properties of the clean slurry test piece of the alkali-activated gelling material, the preparation method of the alkali-activated gelling material of the present invention comprises the following steps:

[0038] After the raw ore of siliceous iron tailings is dried, it is ball-milled in a ball mill until the specific surface area is 350m 2 / kg.

[0039] The siliceous iron tailings powder, fly ash and slag powder obtained after grinding are mixed according to different proportions to obtain iron tailings powder-...

Embodiment 2

[0047] Example 2: The influence of the modulus and content of water glass on the performance of the alkali-activated gelling material with iron tailings as the main raw material.

[0048] First chemically pure NaOH is added in the undisturbed industrial water glass (modulus n=3.3) to adjust the modulus of water glass (the modulation ratio is shown in Table 3), and the modulus and content of detection water glass are paired with alkali-activated cementitious material clean slurry test Influence on the mechanical properties of parts, the preparation method of alkali-activated gelling material of the present invention comprises the following steps:

[0049] After the raw ore of siliceous iron tailings is dried, it is ball-milled in a ball mill until the specific surface area is 350m 2 / kg.

[0050] The siliceous iron tailing powder with a mass percentage of 50%, 35% of slag powder and 15% of fly ash are mixed to obtain a composite powder material of iron tailing powder-fly ash-s...

Embodiment 3

[0057] Example 3: The effect of water content on the properties of the alkali-activated cementitious material with iron tailings as the main raw material.

[0058] Mix industrial water glass (water content 64%) with a modulus n of 3.3 and chemically pure NaOH at a weight ratio of 1:0.1, stir at room temperature to adjust the modulus n of the water glass to 1.5, and test the alkali-induced gelation of different water-powder ratios The impact of material clean slurry test piece mechanical properties, the preparation method of alkali-activated gelling material of the present invention comprises the following steps:

[0059] After the raw ore of siliceous iron tailings is dried, it is ball-milled in a ball mill until the specific surface area is 350m 2 / kg.

[0060] The composite powder is obtained by mixing siliceous iron tailings powder with a mass percentage of 50%, slag powder with 35% and fly ash with 15%.

[0061] Water glass (Na 2 O nSiO 2 ) and different contents of wa...

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Abstract

The invention relates to an alkali-activated cementing material prepared from siliceous iron tailings and a preparation method of the alkali-activated cementing material. The preparation method comprises the following steps: 1) proportionally and evenly mixing siliceous iron tailing powder, coal ash and slag powder together to obtain iron tailing powder-coal ash-slag powder compound powder; 2) mixing liquid water glass with water to obtain an alkali activating agent solution; 3) adding the alkali activating agent solution to the compound powder and stirring evenly to obtain an alkali-activated cementing material paste; 4) injecting the alkali-activated cementing material paste into a die for vibrating molding and maintaining under a normal temperature condition until knockout, thereby obtaining an alkali-activated cementing material net paste test piece; and 5) performing steam curing on the alkali-activated cementing material net paste test piece. The alkali-activated cementing material has the beneficial effects that the alkali-activated cementing material hardened paste has excellent mechanical properties, the 3d compressive strength of the optimal proportion of the hardened paste is greater than 60MPa and the 28d compressive strength of the hardened paste is greater than 80MPa.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to an alkali-activated gelling material prepared from siliceous iron tailings and a preparation method thereof. Background technique [0002] At present, my country has accumulated more than 10 billion tons of tailings, and its annual output has reached 1.2 billion tons, accounting for 45.8% of the total annual production of bulk industrial solid waste in the country and more than 50% of the world's tailings output. Compared with bulk industrial solid waste such as fly ash and coal gangue, the comprehensive utilization technology of tailings is more complicated and more difficult. At present, the comprehensive utilization rate of tailings in my country is only 13.3%. In contrast, the comprehensive utilization of tailings lags behind other bulk industrial solid wastes. Among them, the production of iron tailings is the largest, accounting for 45% of the production of various types ...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/147
CPCY02P40/10
Inventor 李北星叶茂冯紫豪
Owner WUHAN UNIV OF TECH
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