阅读说明：本技术 一种粉煤灰、炉底渣、富水电石渣基地聚物及其制备方法 (Base polymer of fly ash, furnace bottom slag and water-rich carbide slag and preparation method thereof ) 是由 周新星 周亚军 张艳聪 陈毅 刘亚明 边伟 荣亚鹏 高学凯 吕子龙 张必昌 于 2019-11-22 设计创作，主要内容包括：本发明属于新型地聚物注浆材料及其应用技术领域,主要公开了一种粉煤灰、炉底渣、富水电石渣基地聚物及其制备方法,本发明地聚物由循环流化床锅炉燃烧产生的粉煤灰和炉底渣与富水电石渣、碱激发剂溶液、波特兰水泥及减水剂制备而成,其中碱激发剂溶液为氢氧化钠溶液和以下四种钠盐溶液中的至少一种的组合：硅酸钠溶液、硫酸钠溶液、磷酸钠溶液、碳酸钠溶液。本发明地聚物充分利用工业固体废弃物,资源再利用,且掺加的少量波特兰水泥和减水剂可快速固化粉煤灰、炉底渣、富水电石渣基地聚物、安全无毒,对环境友好,强度高,固化时间短；同时该制备方法工艺简单,操作方便。(The invention belongs to the technical field of novel geopolymer grouting materials and application thereof, and mainly discloses a geopolymer based on fly ash, furnace bottom slag and water-rich carbide slag and a preparation method thereof, wherein the geopolymer is prepared from fly ash and furnace bottom slag generated by combustion of a circulating fluidized bed boiler, the water-rich carbide slag, an alkali activator solution, Portland cement and a water reducing agent, wherein the alkali activator solution is a combination of a sodium hydroxide solution and at least one of the following four sodium salt solutions: sodium silicate solution, sodium sulfate solution, sodium phosphate solution and sodium carbonate solution. The geopolymer of the invention fully utilizes industrial solid waste and resources, and the doped small amount of Portland cement and water reducing agent can quickly cure the geopolymer of fly ash, furnace bottom slag and water-rich carbide slag, is safe and nontoxic, is environment-friendly, has high strength and short curing time; meanwhile, the preparation method has simple process and convenient operation.)

1. A base polymer of fly ash, furnace bottom slag and water-rich carbide slag is prepared from fly ash, furnace bottom slag, water-rich carbide slag, alkali activator solution, ordinary Portland cement and water reducing agent;

the total addition amount of the fly ash, the furnace bottom slag, the water-rich carbide slag and the common Portland cement is 79.5 to 91.0 percent;

the addition amount of the alkali activator solution is 8-20%;

the addition amount of the water reducing agent is 0.2-1.0%.

2. The fly ash, bottom slag, and water-rich carbide slag-based geopolymer of claim 1, wherein: the fly ash and the furnace bottom slag are generated by the combustion of the circulating fluidized bed.

3. The fly ash, bottom slag, and water-rich carbide slag-based geopolymer of claim 1 or 2, wherein: the mass ratio of the fly ash to the furnace bottom slag to the water-rich carbide slag to the common Portland cement is 3: 3: 3: 1.

4. the fly ash, bottom slag, and water-rich carbide slag-based geopolymer of claim 3, wherein: the total addition amount of the fly ash, the furnace bottom slag, the water-rich carbide slag and the common Portland cement is 83.4-89.6%; the addition amount of the alkali activator solution is 10 to 16 percent; the addition amount of the water reducing agent is 0.2-0.8%.

5. The fly ash, bottom slag, and water-rich carbide slag-based geopolymer of claim 3, wherein: the furnace bottom slag is the furnace bottom slag which passes through a standard sieve of 0.075mm, and the water-rich carbide slag is the carbide slag with the water content of 20-40 wt%.

6. The fly ash, bottom slag, and water-rich carbide slag-based geopolymer of claim 3, wherein: the alkali activator solution is a combination of 1-10mol/L sodium hydroxide solution and at least one of the following four sodium salt solutions: 1-10mol/L sodium silicate solution, 1-10mol/L sodium sulfate solution, 1-10mol/L sodium phosphate solution and 1-10mol/L sodium carbonate solution; the mass ratio of the sodium hydroxide solution to any one of the sodium salt solutions is 1: 1.

7. the fly ash, bottom slag, and water-rich carbide slag-based geopolymer of claim 6, wherein: the alkali activator solution is 1mol/L sodium hydroxide solution and one of the following four sodium salt solutions in a mass ratio of 1: 1, mixed solution: 1mol/L sodium silicate solution, 1mol/L sodium sulfate solution, 1mol/L sodium phosphate solution and 1mol/L sodium carbonate solution.

8. The fly ash, bottom ash, and hydrocarbonated slag-based geopolymer according to any one of claims 4 to 7, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.

9. The fly ash, bottom ash, and hydrocarbonated slag-based geopolymer according to any one of claims 4 to 7, wherein: the ordinary portland cement is p.o52.5.

10. A method for preparing the coal ash, bottom slag and water-rich carbide slag-based geopolymer as defined in any one of claims 1-9, comprising the steps of:

(1) preparing an alkali activator solution;

(2) preparing a solid waste mixture of fly ash, furnace bottom slag and water-rich carbide slag: mixing the furnace bottom slag with the fly ash, the water-rich carbide slag and the common Portland cement, and uniformly stirring;

(3) preparation of geopolymer gel: mixing the fly ash, the furnace bottom slag, the water-rich carbide slag solid waste mixture, the alkali activator solution and the water reducing agent, and uniformly stirring;

(4) preparing a geopolymer: injecting geopolymer gel into the position needing grouting filling by a grouting pump, and standing until solidification.

Technical Field

The invention belongs to the technical field of novel geopolymer grouting materials and application thereof, and particularly relates to a geopolymer based on fly ash, furnace bottom slag and water-rich carbide slag and a preparation method thereof, wherein three industrial solid wastes are fully utilized.

Background

The geopolymer is a novel high-performance gel material, is an inorganic gel material with a high-performance three-dimensional network structure and similar performance to ceramics, has the advantages of corrosion resistance, permeation resistance, high temperature resistance, high strength, good durability and the like, and has the characteristics of wide raw material source, low price, environmental protection, simple process and the like compared with common portland cement. The geopolymer has a plurality of excellent properties, so that the geopolymer becomes a hot spot of domestic and foreign research and is widely concerned.

At present, geopolymer research includes single solid waste raw material based geopolymer, composite solid waste (usually two solid wastes) raw material based geopolymer, etc., however, they generally have the disadvantages of poor mechanical properties, especially durability, high raw material comprehensive cost, long solidification time, and difficulty in maintaining good compression resistance and bending resistance, etc. The invention aims to prepare the geopolymer by taking three solid wastes of fly ash, furnace bottom slag and water-rich carbide slag as main raw materials, and can obviously reduce the material cost, improve the durability of the geopolymer and the like.

Disclosure of Invention

The invention provides a geopolymer based on fly ash, furnace bottom slag and water-rich carbide slag and a preparation method thereof, aiming at solving the problems of complex preparation process, high cost, poor stability, long solidification time, difficulty in maintaining better compression resistance and bending resistance and the like of the current geopolymer. The preparation method has the advantages of simple process and equipment, environmental protection, low price and convenient operation.

The technical scheme adopted for realizing the above purpose of the invention is as follows:

a base polymer of fly ash, furnace bottom slag and water-rich carbide slag is prepared from fly ash, furnace bottom slag, water-rich carbide slag, alkali activator solution, ordinary Portland cement and water reducing agent;

the mass ratio of the fly ash to the furnace bottom slag to the water-rich carbide slag to the common Portland cement is 3: 3: 3: 1;

the total addition amount of the fly ash, the furnace bottom slag, the water-rich carbide slag and the common Portland cement is 79.5 to 91.0 percent;

the addition amount of the alkali activator solution is 8 to 20 percent;

the addition amount of the water reducing agent is 0.2-1.0%.

The addition amount refers to the mass percentage of a single raw material or the total amount of a plurality of raw materials in all raw materials.

Preferably, the total addition amount of the fly ash, the bottom slag, the water-rich carbide slag and the common Portland cement is 83.4-89.6%; the addition amount of the alkali activator solution is 10 to 16 percent; the addition amount of the water reducing agent is 0.2-0.8%.

The fly ash and the furnace bottom slag are generated by the combustion of the circulating fluidized bed.

The furnace bottom slag is the furnace bottom slag which passes through a standard sieve of 0.075mm, and the water-rich carbide slag is the carbide slag with the water content of 20-40 wt%.

The alkali activator solution is a combination of 1-10mol/L sodium hydroxide solution and at least one of the following four sodium salt solutions: 1-10mol/L sodium silicate solution, 1-10mol/L sodium sulfate solution, 1-10mol/L sodium phosphate solution and 1-10mol/L sodium carbonate solution. The mass ratio of the sodium hydroxide solution to any one of the sodium salt solutions is 1: 1.

preferably, the concentration of the sodium hydroxide solution is 1 mol/L.

Preferably, the alkali activator solution is 1mol/L sodium hydroxide solution and one of the following four sodium salt solutions in a mass ratio of 1: 1, mixed solution: 1mol/L sodium silicate solution, 1mol/L sodium sulfate solution, 1mol/L sodium phosphate solution and 1mol/L sodium carbonate solution.

Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.

Preferably, the ordinary portland cement is p.o52.5.

A preparation method of the base polymer of the fly ash, the furnace bottom slag and the water-rich carbide slag comprises the following steps:

(1) preparing an alkali activator solution: mixing a sodium hydroxide solution with at least one of the four sodium salt solutions, stirring the mixture for 30min at room temperature and 150r/min by a stirrer until the mixture is uniform, and stopping stirring to obtain an alkali activator solution;

(2) preparing a solid waste mixture of fly ash, furnace bottom slag and water-rich carbide slag: mixing the furnace bottom slag with the fly ash, the water-rich carbide slag and the common Portland cement, stirring the mixture for 30min at room temperature of 150r/min by a stirrer until the mixture is uniform, and stopping stirring to obtain a solid-waste mixture of the fly ash, the furnace bottom slag and the water-rich carbide slag;

(3) preparation of geopolymer gel: mixing the fly ash, the furnace bottom slag, the water-rich carbide slag solid waste mixture, the alkali activator solution and the water reducing agent, stirring for 1h at 45 ℃ by a stirrer at 200r/min until the mixture is uniform, and stopping stirring to obtain geopolymer gel;

(4) preparing a geopolymer: pouring geopolymer gel into a cement triple mold, standing for 12h for molding, demolding to obtain geopolymer of the fly ash, the furnace bottom slag and the water-rich carbide slag, and after complete solidification, using the geopolymer for performance test;

in practical application, the geopolymer gel obtained in the step (3) is directly injected to a position needing grouting filling by using a grouting pump, and is kept standing until solidification.

Compared with the prior art, the invention has the advantages and beneficial effects that:

1. the geopolymer takes three industrial wastes of fly ash, furnace bottom slag and water-rich carbide slag generated by the combustion of a circulating fluidized bed as main raw materials, and has the excellent characteristics of economy, high efficiency, environmental protection and the like.

2. The geopolymer has no pollution to the environment, can promote the rapid generation of C-S-H (as shown in figure 5) by using the fly ash, the bottom slag and the water-rich carbide slag together, improves the strength and the durability of the geopolymer, shortens the curing time of the geopolymer, and can be widely applied to the engineering of transportation, civil engineering and construction and the like.

3. The preparation method of the geopolymer is simple and easy to implement, convenient to operate, non-toxic and pollution-free, simple and common in required equipment, free of excessive equipment investment and use cost, and suitable for industrial production.

Drawings

FIG. 1 is an XRD pattern of a sample of the raw material fly ash in examples 1-6 of the present invention.

FIG. 2 is an XRD pattern of a sample of the bottom slag of the raw material furnace in examples 1 to 6 of the present invention.

FIG. 3 is an XRD pattern of a sample of raw carbide slag in examples 1-6 of the present invention.

FIG. 4 is a sample of the geopolymer prepared in example 3.

FIG. 5 is a scanning electron micrograph of the geopolymer prepared in example 3.

Detailed Description

The applicant shall now describe the present invention in further detail with reference to specific examples.