阅读说明：本技术 一种利用电石渣与粉煤灰作为混合材的复合水泥 (Composite cement using carbide slag and fly ash as mixed material ) 是由 张红卫 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种利用电石渣与粉煤灰作为混合材的复合水泥,属于水泥生产技术领域,由如下重量份的物质组成：6~10份改性电石渣、8~12份粉煤灰、12~15份矿渣、65~70份硅酸盐水泥熟料、3~6份石膏。本发明在水泥中添加了特殊处理的电石渣和粉煤灰作为混合材,充分利用了废弃物质,降低了水泥成本,保护了自然环境,同时因改性电石渣和粉煤灰的配伍使用,有效的提升了水泥的综合强度及耐候性能,延长了水泥的寿命。(The invention discloses composite cement using carbide slag and fly ash as a mixed material, which belongs to the technical field of cement production and comprises the following substances in parts by weight: 6-10 parts of modified carbide slag, 8-12 parts of fly ash, 12-15 parts of slag, 65-70 parts of portland cement clinker and 3-6 parts of gypsum. According to the invention, the specially treated carbide slag and the fly ash are added into the cement as a mixed material, so that waste substances are fully utilized, the cement cost is reduced, the natural environment is protected, meanwhile, due to the compatibility of the modified carbide slag and the fly ash, the comprehensive strength and the weather resistance of the cement are effectively improved, and the service life of the cement is prolonged.)

1. The composite cement using the carbide slag and the fly ash as mixed materials is characterized by comprising the following substances in parts by weight:

6-10 parts of modified carbide slag, 8-12 parts of fly ash, 12-15 parts of slag, 65-70 parts of portland cement clinker and 3-6 parts of gypsum.

2. The composite cement using the carbide slag and the fly ash as the mixed material according to claim 1, which is characterized by comprising the following components in parts by weight:

8 parts of modified carbide slag, 10 parts of fly ash, 14 parts of slag, 68 parts of portland cement clinker and 5 parts of gypsum.

3. The composite cement using the carbide slag and the fly ash as the admixture as claimed in claim 1, wherein the preparation method of the modified carbide slag comprises the following steps:

(1) firstly, putting the carbide slag into a vacuum drying oven for drying treatment, and taking out for later use after 1-2 hours;

(2) uniformly atomizing and spraying a titanate coupling agent aqueous solution on the carbide slag treated in the step (1), and taking out the carbide slag for later use;

(3) putting the carbide slag treated in the step (2) into a reaction kettle, adding aluminum nitrate, polyethylene glycol, polyurea formaldehyde, zinc stearate and rare earth into the reaction kettle, continuously stirring, and simultaneously carrying out temperature-changing heating treatment on the reaction kettle, controlling the temperature in the reaction kettle to be 110-120 ℃, carrying out heat preservation treatment for 5-8 min, then raising the temperature in the reaction kettle to 200-220 ℃, carrying out heat preservation treatment for 15-20 min, then raising the temperature in the reaction kettle to 330-360 ℃, carrying out heat preservation treatment for 25-30 min, and finally reducing the temperature in the reaction kettle to 22-24 ℃ and taking out the carbide slag.

4. The composite cement using the carbide slag and the fly ash as the admixture as claimed in claim 3, wherein the air pressure in the vacuum drying oven is controlled to be 1 to 10Pa and the temperature is controlled to be 80 to 85 ℃ during the drying treatment in step (1).

5. The composite cement using the carbide slag and the fly ash as the mixed materials according to claim 3, wherein the titanate coupling agent in the titanate coupling agent aqueous solution in the step (2) is 10-15% by mass; the atomization spraying amount of the titanate coupling agent aqueous solution is 12-16% of the total mass of the carbide slag.

6. The composite cement using the carbide slag and the fly ash as the mixed material according to claim 3, wherein the amount of the aluminum nitrate added in the step (3) is 15-20% of the total mass of the carbide slag, the amount of the polyethylene glycol added is 4-6% of the total mass of the carbide slag, the amount of the polyurea formaldehyde added is 3-5% of the total mass of the carbide slag, the amount of the zinc stearate added is 0.2-0.4% of the total mass of the carbide slag, and the amount of the rare earth added is 0.03-0.05% of the total mass of the carbide slag.

7. The composite cement using the carbide slag and the fly ash as the mixed material according to claim 6, wherein the rare earth is any one of lanthanum nitrate, cerium nitrate and ytterbium nitrate.

8. The composite cement using the carbide slag and the fly ash as the admixture as claimed in claim 1, wherein the fly ash is fly ash from concrete company.

9. The composite cement using the carbide slag and the fly ash as the admixture as claimed in claim 1, wherein the slag, the portland cement clinker and the gypsum are selected from slag, portland cement clinker and gypsum of cement factories; the grain diameters of the slag, the portland cement clinker and the gypsum are not more than 15 mm.

Technical Field

The invention belongs to the technical field of cement production, and particularly relates to composite cement using carbide slag and fly ash as a mixed material.

Background

The cement is a powdery hydraulic cementing material which is mixed with water to form plastic slurry, can be used for cementing materials such as sand, stone and the like, and can be hardened in air and water. The types of cement are various and are divided into three main types of general cement, special cement and special cement, wherein the composite cement is one of the varieties of the general cement. The cement has better plasticity after being mixed with water, can obtain higher strength after being hardened, and has better durability. Therefore, the cement is not only widely applied to industrial and civil buildings, but also widely applied to projects such as traffic, urban construction, agriculture and forestry, water conservancy and oceans, and the novel cement-based composite material is also applied to the construction of nuclear industry, aerospace industry and other novel industries, plays an important role in ensuring the smooth progress of national construction plans, and has a very wide application prospect.

The main raw materials for cement production comprise limestone, clay and iron powder, and due to the continuous expansion of the production scale of cement, the resources of natural raw material mines are continuously developed and utilized and gradually reduced, so that new raw material resources are urgently needed to replace.

The carbide slag is industrial waste slag discharged in the production process of acetylene, polyvinyl chloride and the like in chemical plants, and the main component of the carbide slag is Ca (OH)₂At present, the main utilization ways of the carbide slag have three aspects: the first is used for producing building materials, the second is used for producing chemical products, and the third is used for environmental governance. In recent years, research on preparation of cement by using carbide slag as a raw material through high-temperature calcination has been carried out, but the production process is complex, the fuel consumption and heat consumption are high, the exhaust emission is large, and the production cost is increased.

The fly ash refers to substances discharged from a flue and collected by a dust collector after pulverized coal ground in a coal-fired power plant is combusted in a boiler, is one of coal-fired byproducts with the largest discharge amount in China at present, and has the specific surface area of 2500-7000cm²(g) SiO as the main component₂，Al₂O₃And Fe₂O₃The fly ash is a typical pozzolanic material with potential activity, the fly ash used as a cement and concrete admixture for the production of cement, sintered bricks and other novel building materials and the engineering fields of civil engineering, water conservancy, ocean and the like is a main way for utilizing the fly ash at home and abroad at present, and the report of preparing composite cement by utilizing carbide slag and fly ash as a mixed material is rarely seen at present. In addition, even if some cement is added with the raw material components, the performance of the cement is generally short, and the strength, the weather resistance and the like can not well meet the use requirements, so that the improvement is continuously needed.

Disclosure of Invention

The invention aims to provide composite cement using carbide slag and fly ash as a mixed material, which can effectively utilize waste materials and enhance the overall performance of the cement.

The technical purpose of the invention is realized by the following technical scheme:

a composite cement using carbide slag and fly ash as a mixed material comprises the following substances in parts by weight:

6-10 parts of modified carbide slag, 8-12 parts of fly ash, 12-15 parts of slag, 65-70 parts of portland cement clinker and 3-6 parts of gypsum.

Preferably, the composition consists of the following substances in parts by weight:

8 parts of modified carbide slag, 10 parts of fly ash, 14 parts of slag, 68 parts of portland cement clinker and 5 parts of gypsum.

Further, the preparation method of the modified carbide slag comprises the following steps:

(1) firstly, putting the carbide slag into a vacuum drying oven for drying treatment, and taking out for later use after 1-2 hours;

(2) uniformly atomizing and spraying a titanate coupling agent aqueous solution on the carbide slag treated in the step (1), and taking out the carbide slag for later use;

(3) putting the carbide slag treated in the step (2) into a reaction kettle, adding aluminum nitrate, polyethylene glycol, polyurea formaldehyde, zinc stearate and rare earth into the reaction kettle, continuously stirring, and simultaneously carrying out temperature-changing heating treatment on the reaction kettle, controlling the temperature in the reaction kettle to be 110-120 ℃, carrying out heat preservation treatment for 5-8 min, then raising the temperature in the reaction kettle to 200-220 ℃, carrying out heat preservation treatment for 15-20 min, then raising the temperature in the reaction kettle to 330-360 ℃, carrying out heat preservation treatment for 25-30 min, and finally reducing the temperature in the reaction kettle to 22-24 ℃ and taking out the carbide slag.

Further, the air pressure in the vacuum drying oven is controlled to be 1-10 Pa and the temperature is controlled to be 80-85 ℃ during the drying treatment in the step (1).

Further, the mass fraction of the titanate coupling agent in the titanate coupling agent aqueous solution in the step (2) is 10-15%; the atomization spraying amount of the titanate coupling agent aqueous solution is 12-16% of the total mass of the carbide slag.

Further, the adding amount of the aluminum nitrate in the step (3) is 15-20% of the total mass of the carbide slag, the adding amount of the polyethylene glycol is 4-6% of the total mass of the carbide slag, the adding amount of the polyurea formaldehyde is 3-5% of the total mass of the carbide slag, the adding amount of the zinc stearate is 0.2-0.4% of the total mass of the carbide slag, and the adding amount of the rare earth is 0.03-0.05% of the total mass of the carbide slag.

Further, the rare earth is any one of lanthanum nitrate, cerium nitrate and ytterbium nitrate.

Further, the fly ash is selected from fly ash of concrete company.

Further, the slag, the portland cement clinker and the gypsum are all selected from slag, portland cement clinker and gypsum of cement plants; the grain diameters of the slag, the portland cement clinker and the gypsum are not more than 15 mm.

The carbide slag added in the cement of the invention is rich in Ca (OH)₂The added fly ash particles are fine and have the characteristic of potential pozzolanic activity, the added fly ash particles and the added fly ash particles can effectively improve the strength of cement after being compounded and used, the setting time of the cement can be shortened, in order to further enhance the adding and using quality of the carbide slag, special modification treatment is carried out on the carbide slag, wherein the carbide slag is dried firstly, and is convenient for subsequent processing treatment after being dried completely because the carbide slag contains a large amount of moisture, and then the water solution of titanate coupling agent is atomized and sprayed on the carbide slag, so that the surface activity of the carbide slag is enhanced by the titanate coupling agent, and the modification process is facilitated; then, aluminum nitrate, polyethylene glycol, polyurea formaldehyde, zinc stearate, rare earth and carbide slag are mixed to prepare a reinforced composite material, the composite material has a large number of pore structures, most pores on the surface layer of the composite material are micron-sized, the structure can be better doped and fused with fly ash, and the effect of enhancing the tissue strength and stability in cement is achieved, so that the reinforcing effect of compatibility of the aluminum nitrate, the polyethylene glycol, the polyurea formaldehyde, the zinc stearate, the rare earth and the carbide slag is realized; the comprehensive performance of the finally prepared cement is effectively improved.

Compared with the prior art, the invention has the following advantages:

according to the invention, the specially treated carbide slag and the fly ash are added into the cement as the mixed material, so that waste materials are fully utilized, the cement cost is reduced, the natural environment is protected, meanwhile, due to the compatibility of the modified carbide slag and the fly ash, the comprehensive strength and the weather resistance of the cement are effectively improved, the service life of the cement is prolonged, the market competitiveness of the cement is improved, and the cement has good economic benefits and popularization values.

Drawings

FIG. 1 is a graph of comparative data from the weathering stability test of the present invention.

Detailed Description