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Preparation method of single-component geopolymer cement

A geopolymer cement, a single-component technology, applied in the field of cement materials, can solve the problems of low comprehensive utilization rate of metal tailings, resource waste environment, tailings accumulation, etc., and achieve low price, energy saving and carbon emission reduction Effect

Active Publication Date: 2020-08-25
SANMING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a single-component geopolymer cement preparation method to solve the problems of low comprehensive utilization rate of metal tailings resulting in tailings accumulation, waste of resources and environmental pollution caused thereby

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preparation example Construction

[0015] The invention provides a method for preparing single-component geopolymer cement, comprising the following steps:

[0016] S1, obtain raw materials, and count SiO in said raw materials respectively 2 、Al 2 o 3 and the content of Ca-containing compounds to obtain the analysis results, wherein the raw materials are selected from metal tailings, feldspar, papermaking lime mud and cement kiln dust, etc. The main components are SiO 2 、Al 2 o 3 and industrial by-products of Ca-containing compounds. The Ca-containing compound is CaO and / or CaCO 3 , where CaCO 3 CaO can be obtained by high temperature calcination. Through the comprehensive utilization of solid waste such as metal tailings, on the one hand, it can reduce the environmental pressure caused by the stockpiling of tailings. efficient utilization and energy saving.

[0017] Further, in terms of mass percentage, in the metal tailings, the SiO 2 35% to 45%, the Al 2 o 3 5% to 8%, the CaO is 25% to 30%, and i...

Embodiment 1

[0031] A kind of single-component geopolymer cement preparation method provided by the present embodiment comprises the following steps:

[0032] (1) Preparation of admixtures: The composition of metal tailings, papermaking lime mud and feldspar is shown in Table 1. According to SiO in Table 1 2 、Al 2 o 3 The mass ratio of CaO and CaO is calculated by mass percentage, and the metal tailings, papermaking lime mud and feldspar are blended at 50%, 30% and 20% respectively to prepare the admixture. Among them, by mass percentage, in the admixture, SiO 2 35.6%, CaO 30.1%, Al 2 o 3 6.3%, SiO 2 and Al 2 o 3 The mass ratio is 5.65:1.

[0033] Table 1 Analysis results of metal tailings, papermaking lime mud and feldspar composition (mass ratio %)

[0034] Element SiO 2

CaO MgO Fe 2 o 3

Al 2 o 3

SO 3

Na 2 o

K 2 o

Loss on ignition metal tailings 41.0 28.6 4.0 8.4 6.7 3.1 0.2 0.2 7.8 Papermaking clay 2.1 ...

Embodiment 2

[0038] A kind of single-component geopolymer cement preparation method is provided in the present embodiment, differs from embodiment 1 in that:

[0039] Preparation of admixtures in step (1): the composition of metal tailings, cement kiln dust and feldspar is shown in Table 2. According to SiO in Table 2 2 、Al 2 o 3 The mass ratio of CaO and metal tailings, papermaking lime mud and feldspar are blended at a mass ratio of 5:3:2 to prepare the admixture. Among them, by mass percentage, in the admixture, SiO 2 37.2%, CaO 30.6%, Al 2 o 3 6.9%, SiO 2 and Al 2 o 3 The mass ratio is 5.4:1.

[0040] Table 2 Analysis results of metal tailings, cement kiln dust and feldspar composition (mass ratio %)

[0041]

[0042]

[0043] The 28d cube compressive strength of the one-component geopolymer cement obtained by this embodiment is 45MPa, and the 28d cube compressive strength of this single-component geopolymer cement reaches No. 42.5 cement strength standard, and its 3d c...

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Abstract

The invention provides a preparation method of single-component geopolymer cement. Industrial by-products such as metal tailings, feldspar, papermaking white mud, cement kiln powder and the like of which the main components are SiO2, Al2O3 and Ca-containing compounds are utilized, a solid alkali activator is added, so that the single-component geopolymer cement can be prepared. On one hand, environmental pressure caused by the stockpiling of metal tailings is reduced; and on the other hand, the resource utilization of solid waste such as the metal tailings can be achieved due to wide sources and low prices of raw materials. The 28d cube compressive strength of the single-component geopolymer cement is 35-45MPa, so that the single-component geopolymer cement can be widely applied to concrete preparation, rock-soil body grouting reinforcement, highway or airfield runway rapid repair, concrete prefabricated part manufacturing, wall body building block manufacturing and production raw materials of permeable pavement bricks, kerbs and other building material products.

Description

technical field [0001] The invention relates to the field of cement materials, and in particular to a preparation method of single-component geopolymer cement. Background technique [0002] Mineral resources are the material basis for the survival and development of society. At present, more than 95% of domestic primary energy, more than 80% of industrial raw materials and more than 70% of agricultural production materials come from mineral resources. Due to the low effective comprehensive utilization rate of mineral resources, a large amount of useful resources have entered into the tailings and waste rocks. There are industrial waste residues and metal tailings almost everywhere in my country, and some industrial waste residues are still very large, such as fly ash. If not treated and comprehensively utilized, tailings will occupy more and more land, causing secondary environmental pollution, resulting in waste of resources, and further affecting the sustainable developm...

Claims

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Application Information

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IPC IPC(8): C04B12/00C04B7/24
CPCC04B12/005C04B7/24Y02P40/10
Inventor 张会芝刘纪峰杨悦陈孝国连跃宗付晓强
Owner SANMING UNIV
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