阅读说明：本技术 环氧丙烷皂化废渣固化在基层铺筑材料中的应用 (Application of epoxy propane saponification waste residue in curing of base layer paving material ) 是由 张格亮 刘钰 张学兵 马慧 朱峰 于 2020-06-30 设计创作，主要内容包括：本发明提出的是环氧丙烷皂化废渣固化在基层铺筑材料中的应用。首先将皂化渣在105～110℃下烘干,在皂化渣中加入粉煤灰简单拌合,皂化渣与粉煤灰的重量比为8:2,皂化渣与粉煤灰混合物的水分含量控制在重量的23～28%,其次添加固化剂与水泥进行混合土拌合,水泥为干皂化渣重量的6～8%,固化剂与水泥的重量比为4：5,再其次,将环氧丙烷皂化废渣作为基层铺筑材料在工程中铺筑、压实,最后对其进行室外保养,替代传统的施工材料。本发明采用皂化渣土中加入粉煤灰,添加固化剂与水泥,作为基层铺筑材料使用。既实现皂化渣资源化,又可消除皂化渣存放及存放可能产生的安全和环境次生污染隐患。适宜作为环氧丙烷皂化废渣回收应用。(The invention provides an application of propylene oxide saponification waste residue solidification in a base layer paving material. Firstly, drying the saponification slag at 105-110 ℃, adding fly ash into the saponification slag for simple mixing, wherein the weight ratio of the saponification slag to the fly ash is 8:2, the water content of a mixture of the saponification slag and the fly ash is controlled to be 23-28% of the weight, secondly, adding a curing agent into the mixture for mixing with cement, the weight ratio of the cement to the dry saponification slag is 6-8%, and the weight ratio of the curing agent to the cement is 4: and 5, secondly, paving and compacting the epoxy propane saponified waste residue serving as a basic layer paving material in engineering, and finally performing outdoor maintenance on the basic layer paving material to replace the traditional construction material. The invention adopts the saponified dregs soil added with fly ash and added with curing agent and cement as basic paving material. Not only realizes the recycling of the saponification slag, but also eliminates the hidden troubles of safety and environmental secondary pollution possibly caused by the storage and storage of the saponification slag. The method is suitable for recycling and applying the saponified waste residue of the propylene oxide.)

1. The application of the solidified saponified waste residue of the epoxypropane in the base layer paving material is characterized in that: aiming at the characteristic condition of the saponification waste residue soil of the epoxypropane, a curing agent is selected for recycling the saponification waste residue soil, and the saponification waste residue soil is mixed to prepare a base layer paving material, firstly, the saponification waste residue is dried at 105-110 ℃, the fly ash is added into the saponification waste residue for simple mixing, and the weight ratio of the saponification waste residue to the fly ash is 8:2, controlling the water content of the mixture of the saponification slag and the fly ash to be 23-28% of the weight; secondly, adding a curing agent and cement to mix the mixed soil, wherein the weight of the cement is 6-8% of that of the dry saponification slag, and the weight ratio of the curing agent to the cement is 4: 5; secondly, paving and compacting the saponified waste residue of the epoxy propane as a basic paving material in engineering; and finally, performing outdoor maintenance on the composite material to replace the traditional construction material.

2. The use of the saponified residue of propylene oxide as defined in claim 1, wherein:

the curing agent is selected from alumina or silicon dioxide.

3. The use of the saponified residue of propylene oxide as defined in claim 1, wherein:

the cement is 325 # or 425 # in type.

Technical Field

The invention relates to propylene oxide saponified waste, in particular to application of the cured propylene oxide saponified waste in a base layer paving material.

Background

The saponified waste residue is the waste residue produced in the process of producing the epoxypropane by the chlorohydrination method, and is named as the saponified residue because the saponified waste residue is the waste residue produced in the saponification reaction stage. Millions of tons of saponification slag are produced every year by a plurality of chemical enterprises producing propylene oxide in China. The main component of the saponified slag is CaO, which is similar to a lime material and can be used for roadbed filling. However, the saponified slag also has the characteristics of water swelling and gelatinization and basic loss of strength, and is easy to cause water damage when being singly used as a roadbed layer.

The industrial solid waste recycling is an important component of an energy-saving and environment-friendly strategic emerging industry, the scale and the level of the industrial solid waste recycling are accelerated to be improved, the energy-saving and environment-friendly industry is actively cultivated and developed, the application of a roadbed building material of a road construction project taking soil as a main material is replaced, the use amount of materials such as broken stones and sand and the like of the traditional road construction materials is reduced or not used, and the cement is reduced, so that the industrial solid waste recycling becomes a strategic choice for promoting green development of countries in the world. Because of the environmental protection requirement, the exploitation of essential materials for resource type engineering infrastructure such as mountain-opening stone-blasting, river-digging sand-mining is forbidden, and the rare goods of the sandstone materials can live in and the price is soared. It is imperative to seek an emerging material as a substitute for the traditional infrastructure materials.

Disclosure of Invention

In order to change the hydrophilicity of the saponified residual soil particles, the saponified residual soil particles are changed from hydrophilic materials into hydrophobic materials, and the water resistance of the solidified saponified residual soil is improved; meanwhile, the connection strength among saponified dregs is improved, the compression strength and the fracture toughness of the solidified saponified dregs are enhanced, the water stability and the strength of the solidified saponified dregs are improved, the construction quality requirement of heavy-duty pavement construction is met, and the solidified saponified dregs can be used as a base layer paving material. According to the application, the coal ash is added to improve the porosity of the saponification slag, reduce the water content of the saponification slag, and the curing agent and the cement are added, so that a hydrophobic layer is formed on the surface of a saponification slag mixture, water molecules are prevented from entering the inside of slag soil particles, the saponification slag mixture is prevented from being pasted and collapsed in strength due to water absorption expansion, the application of road base layer building materials of road construction projects taking soil as a main material is replaced, the use amount of materials such as broken stones and sands of traditional road construction materials is reduced or not used, the use amount of the cement is reduced, and the technical problem of recycling and applying of the saponification waste slag of the epoxypropane is solved.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the application of the epoxy propane saponified waste residue solidification in the base course paving material aims at the characteristic condition of the epoxy propane saponified waste residue soil, selects a curing agent for carrying out resource treatment on saponified waste residue soil, and mixes the curing agent and the saponified waste residue soil to prepare the base course paving material, firstly, the saponified slag is dried at 105-110 ℃, the fly ash is added into the saponified slag for simple mixing, and the weight ratio of the saponified slag to the fly ash is 8:2, controlling the water content of the mixture of the saponification slag and the fly ash to be 23-28% of the weight; secondly, adding a curing agent and cement to mix the mixed soil, wherein the weight of the cement is 6-8% of that of the dry saponification slag, and the weight ratio of the curing agent to the cement is 4: 5; secondly, paving and compacting the saponified waste residue of the epoxy propane as a basic paving material in engineering; and finally, performing outdoor maintenance on the composite material to replace the traditional construction material.

Further, the curing agent is selected from alumina or silicon dioxide.

Furthermore, the type of the cement is 325 # or 425 #.

The method has the advantages that the saponification slag soil is subjected to resource treatment by preferably selecting the curing agent according to the characteristic condition of the saponification slag soil, the coal ash is added into the saponification slag soil to improve the porosity of the saponification slag and reduce the water content of the saponification slag, the curing agent and the cement are added, a hydrophobic layer is formed on the surface of the saponification slag mixture, water molecules are prevented from entering the interior of slag soil particles, and the saponification slag mixture is prevented from being gelatinized and collapsed in strength due to water absorption expansion and is used as a base layer paving material. The epoxy propane saponified waste residue is used as a solid waste, the water content of the epoxy propane saponified waste residue is 20-40%, and the solidified saponified residue mixture is used for paving a roadbed layer, so that the saponification residue is recycled, and the potential safety and environmental secondary pollution hazards possibly generated by storage and storage of the saponification residue can be eliminated. The solidified saponification slag mixed material soil can be widely applied to infrastructure such as highway base, simple express roads or yards, and has good economic, environmental and social benefits. The method is suitable for recycling and applying the saponified waste residue of the propylene oxide.

Drawings

FIG. 1 is a diagram showing the relationship between the water content and the density of the soaping slag in the compaction test;

FIG. 2 is a water content change trend chart of a mixture of saponified residues and fly ash;

FIG. 3 is a flow chart of the solidification process of the propylene oxide saponification waste residue.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to the application of the epoxy propane saponified waste residue in the base layer paving material, aiming at the characteristic condition of the soil quality of the epoxy propane saponified waste residue, a curing agent is selected for carrying out resource treatment on saponified waste residue soil, and the saponification waste residue soil is mixed to prepare the base layer paving material, firstly, the saponification waste residue is dried at 105-110 ℃, the fly ash is added into the saponification waste residue for simple mixing, and the weight ratio of the saponification waste residue to the fly ash is 8:2, controlling the water content of the mixture of the saponification slag and the fly ash to be 23-28% of the weight; secondly, adding a curing agent and cement to mix the mixed soil, wherein the weight of the cement is 6-8% of that of the dry saponification slag, and the weight ratio of the curing agent to the cement is 4: 5; secondly, paving and compacting the saponified waste residue of the epoxy propane as a basic paving material in engineering; and finally, performing outdoor maintenance on the composite material to replace the traditional construction material.

The curing agent is selected from alumina or silicon dioxide.

The cement is 325 # or 425 # in type.

Curing performance of the propylene oxide saponification waste residue:

the soaping slag is special powder solid waste, has wet sinking property, can sink when meeting water, thereby generating uneven settlement and leading the pavement to crack. Therefore, the compaction test is very important for ensuring that the saponified soil roadbed reaches the standard compaction degree. The maximum dry density and the maximum water content with the compaction degree of more than 96 percent can be obtained through compaction tests, and important basic data are provided for paving a road base layer after the saponified soil is recycled. As shown in FIG. 1, the results of the compaction test were: the optimum water content is 22.7%, and the maximum dry density is 1.235g/cm³。

Drying the saponified residue at 105 deg.C. Taking 1.2KG of dry saponification slag, adding 0.3g of curing agent, wherein 72g of cement accounts for 6% of the mass of the dry saponification slag, fully and uniformly stirring, and adjusting the water content, wherein the water content of the mixed soil is about 23%. Adopting static pressure to prepare a sample into a 50mm multiplied by 50mm test piece, controlling the dry density of the sample piece to be 1.235g/cm and the pressure to be 10kN³The product is kept for 6 days at 25 +/-2 ℃, soaked in water for 24 hours, and then tested for unconfined compressive strength, and the results are shown in table 1.

TABLE 1 saponification slag solidification mixing ratio and physical properties

Mixing ratio/curing agent cement	Water content of mixed soil	Water absorption/%)	7 days unconfined intensity mean/Kpa
				3 : 3	29.51	5.23	2286.32
3 : 5	27.88	5.12	3055.77
				3 : 7	27.43	4.75	3345.66

Curing performance of the mixture of the saponification slag and the fly ash:

the water content of the saponification slag is 20-40%, and the optimum water content is higher than 22.7%, so that the construction requirements cannot be met. Because the granularity of the saponification slag is small, the moisture migration channel is narrow, and the salt content is high, the drying speed is slow when the saponification slag is aired under natural conditions, and the direct utilization can only adopt a heating and drying mode.

However, millions of tons of saponification slag wastes need to consume a large amount of energy, and construction is inconvenient, so that large-scale resource utilization of the saponification slag is seriously influenced. In order to solve the problem, the coal ash is added into the saponification slag by utilizing the porous characteristic of the coal ash, and the mixture is simply mixed, so that the porosity in the saponification slag is improved, and the moisture migration speed under the natural environment condition is accelerated.

The saponification slag and the fly ash are mixed according to the mass ratio of 7:3 and 6:4, the mixture of the saponification slag and the fly ash with the water content of about 30.70 percent and 25.57 percent is tested for the water change under the natural condition. The results are shown in FIG. 2. The soaping slag and the fly ash are mixed to have obvious improvement effect on water migration, wherein the ratio of 6:4 to 7:3 can meet the construction requirement of water content after days.

(1) Curing performance of the mixture of the saponification slag and the fly ash 9: 1:

drying the saponified residue at 105 deg.C. Taking 1.2KG of dry saponification slag, adding 0.3g of solid72g of cement, namely 72g of agent, is 6 percent of the mass of the dry saponification slag, the mixture is fully stirred uniformly, the moisture content is adjusted, and the moisture content of the mixed soil is about 23 percent. Adopting static pressure to prepare a sample into a 50mm multiplied by 50mm test piece, controlling the dry density of the sample piece to be 1.235g/cm and the pressure to be 10kN³Keeping moisture and keeping health for 6 days at the temperature of 25 +/-2 ℃, soaking for 24 hours, and then testing the unconfined compression strength.

TABLE 2 curing mix ratio and Properties of saponification slag and fly ash 9:1 mixture

Mixing ratio/curing agent cement	Water content of mixed soil	Water absorption/%)	7 days unconfined intensity mean/Kpa
				3 : 5	22.82%	10.73	2364.83
3 : 6	22.58%	10.61	2746.8
				4 : 5	22.35%	10.62	2728.13
4 : 6	24.46%	9.79	2368.23

(2) Curing Properties of 8:2 mixture of saponification slag and fly ash

TABLE 3 curing blend ratio and Properties of 8:2 mixture of soaping slag and fly ash

Mixing ratio/curing agent cement	Water content of mixed soil	Water absorption/%)	7 days unconfined intensity mean/Kpa
				3 : 5	24.02%	10.15	2548.18
3 : 6	22.27%	10.75	2909.78
				4 : 5	25.12%	9.78	2244.3
4 : 6	23.92%	9.98	2470.08

(3) Curing Properties of 7:3 mixture of soaping slag and fly ash

TABLE 4 curing blend ratio and Properties of 7:3 mixture of soaping slag and fly ash

Mixing ratio/curing agent cement	Water content of mixed soil	Water absorption/%)	7 days unconfined intensity mean/Kpa
				3 : 5	21.98%	12.05	2942.03
3 : 6	23.56%	11.02	2667.01
				4 : 5	23.58%	11.25	2762.08
4 : 6	23.03%	11.86	3116.89

(4) Curing property of 6:4 mixture of saponification slag and fly ash

TABLE 5 curing blend ratio and Properties of 6:4 mixture of soaping slag and fly ash

Mixing ratio/curing agent cement	Water content of mixed soil	Water absorption/%)	7 days unconfined intensity mean/Kpa
				3 : 5	22.69%	11.39	2746.8
3 : 6	23.93%	11.19	2736.62
				4 : 5	23.41%	10.48	2439.53
4 : 6	23.87%	11.27	2734.92

The conclusion from the completed test data is as follows: the water content of the mixture of the saponification slag and the fly ash is controlled to be 23-28%, the water content of the saponification slag, the water migration rate and the economic benefit requirement are integrated, the mixture ratio of the saponification slag to the fly ash is 8:2, and the mixture ratio of the curing agent to the cement is 4: 5; the unconfined compression strength of the mixture is more than 2MPa within seven days of solidification, and the performances of the mixture completely meet the requirements of roadbed paving.

Chemical composition of saponified residue (%)

The invention has the advantages that:

the saponified slag has the properties of water absorption expansion, gelatinization and the like, is easy to generate water damage when being singly used for a roadbed layer, and basically loses the strength of the roadbed.

The novel base layer paving material is prepared by mixing the saponified residual soil and the curing agent. The original hydrophilicity of the saponification slag is changed, the hydrophilic property is changed into the hydrophobic material, the water resistance of the saponification slag is improved, and the water damage of a roadbed layer is reduced; the joint strength among the saponified muck particles is improved, the compression strength and the fracture toughness of the saponified muck particles are enhanced, the water stability and the strength of the solidified saponified muck are greatly improved, and the construction quality requirement of the heavy-duty pavement is met.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.