Method for preparing hollow sintered batten by using drilling rock debris-based all-solid waste

Abstract

The invention relates to a method for preparing a hollow sintered batten by using drilling rock debris-based all-solid waste. The method comprises the following steps: mixing drilling rock debris, coal gangue, boric sludge, construction waste and waste glass; adding water, mixing, granulating, aging, and carrying out vacuum extrusion to obtain a wet blank sample; carrying out low-temperature shrinkage drying on the wet blank sample, and then carrying out high-temperature dewatering drying; pre-sintering to remove chemical binding water in the green body; and roasting to obtain the sintered hollow batten. According to the method provided by the invention, all solid wastes are used as raw materials, so that a large amount of solid wastes are consumed while the cost is saved, and the problems of land resource waste and environmental pollution caused by solid waste accumulation are solved; the prepared hollow sintered batten not only can be directly used as a common interior wall material, but also can be assembled and compounded with a thermal insulation material and a steel skeleton on an industrial production line through a digital intelligent manufacturing technology to form a composite exterior wall material for a building external envelope wall body, so that the production investment is low, the operation capital is low, the production cost is low, and the production efficiency is high. And great social benefits are achieved.

Description

Technical Field

[0001] The invention relates to a method for preparing a hollow sintered strip plate by utilizing drilling cuttings-based solid waste, and belongs to the technical field of building materials. Background Art

[0002] Drilling cuttings are a mixture of waste cuttings and waste drilling fluid generated during oil and gas extraction. They are formed when the fine particles produced by the friction between the drill bit and the formation carried by the drilling fluid are pumped to the ground from the annulus formed by the drill string and the well wall together with the drilling fluid. They have complex composition, high concentration of organic pollutants and high pH. If not properly disposed of, they can lead to land salinization, death of aquatic plants and animals, etc., seriously threatening the surrounding ecological environment and the health of residents. The traditional way to deal with drilling cuttings is to solidify and landfill them. However, due to the limited capacity of the landfill pool and the influence of construction technology and construction environment, the solidification and landfill method not only occupies a large amount of land, but also has certain pollution risks.

[0003] Sintered slats are a new type of wall material. After high-temperature roasting at 800℃ to 1200℃, the organic harmful and toxic bacteria and substances in the waste have been decomposed, and the heavy metals are solidified in the products and will not be released, that is, they will return to clay after the end of their service life without causing secondary pollution, and can be reused. If drilling cuttings can be used to prepare sintered slats, it can not only consume the stock of drilling cuttings and reduce environmental pollution, but also conform to the sustainable development of the construction industry, and have very considerable social and economic benefits. However, there is currently no technology for using drilling cuttings to prepare sintered slats. In the current market, the preparation of sintered slats still relies on shale resources. If drilling cuttings can be used to prepare sintered slats, while reducing the cost of raw materials, solid waste treatment service fees can be obtained, achieving two-way profits.

[0004] Although manufacturers have studied the preparation of sintered bricks from drilling cuttings, the sintering temperature, time and energy consumption required for sintering bricks from drilling cuttings are high, and in the process of preparing sintered bricks, especially due to the high sulfur and CaO content in the raw materials, the bricks will burst and frost, which seriously affects the quality of sintered bricks. This problem has not been solved. In previous studies, the amount of drilling cuttings in the formula of sintered bricks was only 10% to 40%, and when the amount was too high, its performance was reduced, which greatly limited the utilization rate of drilling cuttings. Compared with sintered bricks, sintered strips have obvious advantages in energy saving, construction convenience and environmental protection. Therefore, the use of drilling cuttings to prepare sintered strips is more in line with the needs of current buildings. However, when the formula of sintered bricks is directly used in the preparation of sintered strips, it is easy to dry and crack. For the common shale strips on the market, the maximum size can only be 1.5 meters due to the influence of drying and cracking. Therefore, making sintered strips larger has always been a barrier in the industry. In addition, in traditional sintering formulas, natural resources such as shale, clay, and kaolin are usually used as plasticizers to improve the plasticity of the raw materials, but adding mineral raw materials with high potassium and sodium content as fluxes to promote sintering results in high production costs. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In order to solve the above problems of the prior art, the present invention provides a method for preparing hollow sintered strips using drilling cuttings-based solid waste. The method uses industrial solid waste to completely replace mineral raw materials. While meeting performance requirements, it further saves costs, reduces the consumption of natural resources, and realizes the recycling and reuse of solid waste, which is in line with the country's strategic requirements for comprehensive resource utilization and energy conservation and emission reduction.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] A method for preparing hollow sintered strips using drilling cuttings-based solid waste comprises the following steps: S1, mixing drilling cuttings, coal gangue, boron mud, construction waste and waste glass;

[0010] S2, adding water, mixing and granulating, and vacuum-extruding the wet embryo sample after aging;

[0011] S3, shrinking and drying the wet embryo sample at low temperature first, and then removing water and drying at high temperature;

[0012] S4, pre-sintering to remove chemically bound water in the green body; and then sintering to obtain a sintered strip.

[0013] In the method as described above, preferably, in step S1, each raw material is first crushed, and then the drilling cuttings are sieved through a 30-mesh sieve, the coal gangue, boron mud and waste glass are sieved through a 100-mesh sieve, and the construction waste is sieved through a 10-mesh sieve.

[0014] In the method as described above, preferably, in step S1, the raw materials are measured by weight, including 40-70 parts of drilling cuttings, 15-45 parts of coal gangue, 5-10 parts of boron mud, 5-15 parts of construction waste, and 5-10 parts of waste glass.

[0015] Further preferably, the drilling cuttings are 40-60 parts, coal gangue is 20-40 parts, boron mud is 5 parts, construction waste is 10 parts, and waste glass is 5 parts.

[0016] In the above method, preferably, in step S1, the main component of the drilling cuttings is SiO 2 40-50%, CaO 10-15%, SO 3 It is 4-6%, and BaO is 6-8%.

[0017] In the method as described above, preferably, in step S2, the amount of water added is 15-20% of the weight of the dry material.

[0018] In the above method, preferably, in step S2, the aging time is 12 to 72 hours.

[0019] In the method as described above, preferably, in step S3, the temperature of the low-temperature shrinkage drying is 55-65°C for 1-4 hours; the temperature of the high-temperature dehydration drying is 120°C, and after high-temperature dehydration drying, the moisture content of the green body is <2%.

[0020] In the method as described above, preferably, in step S4, the pre-burning condition is to increase the temperature to 500-550°C at 5°C / min and keep it at that temperature for 30 minutes to eliminate moisture and easily decomposable substances, and then increase the temperature to 800-950°C and pre-burn for 30 minutes.

[0021] In the method as described above, preferably, in step S4, the calcination condition is 1000° C. to 1060° C., and the sintering time is 60 to 120 min.

[0022] (III) Beneficial effects

[0023] The beneficial effects of the present invention are:

[0024] The method for preparing hollow sintered strips by utilizing drilling cuttings-based solid waste provided by the present invention adopts drilling cuttings, coal gangue, boron mud, construction waste and waste glass, which are all solid wastes, as raw materials, which saves costs while consuming a large amount of solid waste, thereby solving the waste of land resources and environmental pollution caused by the accumulation of solid waste.

[0025] The method for preparing hollow sintered strips using drilling cuttings-based solid waste provided by the present invention uses drilling cuttings as the basic material. The traditional sintering formula uses clay as a plasticizer and the mineral raw material feldspar as a sintering aid. The present invention uses coal gangue as a plasticizer, which provides plasticity and part of the heat at the same time, saving energy consumption. The drilling cuttings used have not been pre-treated, and the organic matter contained in the drilling fluid can produce special ion adsorption and lubrication effects on the surface of the mud particles, improving the flow properties of the mud when being squeezed; Boron mud and waste glass are used as sintering aids. During the sintering process, the glass first softens and becomes a viscous liquid, and wets other powders. Driven by capillary pressure, the particles begin to rearrange. As the temperature further increases, the boron oxide contained in the glass and the boron mud melts to form a large amount of liquid. The liquid phase wets the powder and reacts chemically with it at the same time. After the reaction is completed, the liquid phase forms capillary pressure, driving the powder to rearrange and complete densification. The method of the invention solves the cracking problem of bricks during drying, can make the length of sintered strips up to 3m, reduces the mineral raw material additives in the sintered brick formula, lowers the sintering temperature, and solves the technical problems of frost and easy cracking of the brick body.

[0026] The method provided by the present invention for preparing sintered hollow sintered strips by utilizing drilling cuttings-based solid waste can directly serve as common interior wall materials, and can also be assembled and composited with insulation materials and steel frames on an industrial production line through digital intelligent manufacturing technology to form composite exterior wall materials for building exterior protective walls with low production investment, low operating capital and low production cost, which not only solves the problem of stacking drilling cuttings-based materials, but also has high social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a picture of drilling cuttings forming according to the preparation method of the present invention;

[0028] Figure 2 This is a picture of sintering drilling cuttings prepared by the method of the present invention. DETAILED DESCRIPTION

[0029] In order to increase the dosage of drilling cuttings, reduce the mineral raw material additives in the sintered brick formula, reduce the sintering temperature, and solve the phenomenon of brick body drying cracking, frost and bursting after sintering, the present invention provides a method for preparing hollow sintered strips from drilling cuttings-based solid waste. Coal gangue is used as a plasticizer to improve the plasticity of drilling cuttings, and waste glass and boron mud are used as sintering aids to reduce the sintering temperature. All raw materials of the present invention are industrial solid waste without any pre-treatment (100% solid waste addition, no secondary pollution discharge). At high temperature, organic harmful and toxic bacteria and substances in the waste are decomposed, and heavy metals are solidified in the product, which saves costs and realizes harmless treatment of solid waste; the coal gangue used provides plasticity while providing part of the calorific value, reduces the use of natural gas, and further saves costs. After the implementation of the scheme of the present invention, a large amount of solid waste can be consumed, the waste of land resources and the pollution to the environment caused by the accumulation of solid waste can be solved, and a hollow sintered strip prepared from solid waste can be provided, which has great social benefits.

[0030] The CaO content in the raw materials of sintered bricks should not exceed 5%, otherwise it will cause difficulties in baking, resulting in lime bursting, moisture absorption, loosening, and powdering. The sulfur content should not exceed 1%, as the product will produce gas during baking. If it exceeds 1%, the brick volume will expand, loosen, and pulverize. CaO and SO in drilling cuttings 3 The contents are 10.59% and 4.68% respectively. The BaO content is 6.07%. XRD analysis shows that BaSO 4 ,BaSO 4 The sintering temperature of the drilling cuttings is high, which may lead to a high sintering temperature of the drilling cuttings. In the solution of the present invention, coal gangue, boron mud and construction waste are added to modify it to form SiO 2 -Al 2 O 3- MgO-CaO system, which can react at high temperature to generate silicates and aluminates, etc. Coal gangue provides ingredients, plasticity and heat, improves the plasticity of drilling cuttings, and saves energy. Boron mud and glass powder are used as sintering aids. During the sintering process, the glass first softens and becomes a viscous liquid, and wets other powders. Driven by capillary pressure, the particles begin to rearrange. As the temperature rises further, the boron oxide contained in the glass and boron mud melts to form a large amount of liquid. The liquid phase wets the powder and reacts chemically with it. After the reaction is completed, the liquid phase forms capillary pressure, which drives the powder to rearrange and complete densification.

[0031] Preparation process: weigh drilling cuttings, coal gangue, boron mud, construction waste and waste glass according to the proportion, and mechanically stir the dry powder; add water (15-20% of the weight of the dry material) to mix and granulate, and stir for 10-20 minutes; aging and homogenization, the aging time is 12-72 hours; mechanically stir and extrude the mud to exhaust; vacuum extrusion; wet embryo drying, low-temperature shrinkage drying at 60°C, transfer to high-temperature dehydration drying at 120°C, the moisture content of the green body is <2%; pre-burning, remove chemically bound water in the green body; sintering, complete the sintering reaction of each component, and obtain a sintered product with strength.

[0032] Material ratio: the mixing ratio of drilling cuttings is preferably 40-70 parts by weight, the mixing ratio of coal gangue is preferably 15-45 parts by weight, the mixing ratio of boron mud is preferably 5-10 parts by weight, the mixing ratio of construction waste is preferably 5-15 parts by weight, and the mixing ratio of waste glass is preferably 5-10 parts by weight. In order to increase the amount of drilling cuttings added and solve the problem of drilling cuttings accumulation, the present invention increases the amount of drilling cuttings. However, after a large number of experimental studies, it is found that when the amount of drilling cuttings is too high, frost burst point will occur, so 40 to 70 parts are preferred; when the amount of coal gangue is less than 15 parts, it will crack when the mud blank is extruded, because it is used as a plasticizer, so the preferred amount of coal gangue is 15 to 45 parts; when the amount of boron mud is less than 5 parts, the sintering temperature is high, the energy consumption increases, and the cost increases. Excessive use will cause alkali blooming, resulting in poor durability of sintered products, and pulverization over time, so the preferred amount of boron mud is 5 to 10 parts. The study also found that when the amount of construction waste exceeds 15 parts, microcracks will occur during the sintering process. If the amount is too little, such as less than 5 parts, cracks will occur when the mud blank is dried, so the construction waste is preferably 5 to 15 parts. When the amount of waste glass exceeds 10 parts, the sintered strips will be difficult to form. If the amount is too little, such as less than 5 parts, the sintering temperature will be too high. Therefore, the waste glass is preferably 5 to 10 parts.

[0033] The forming principle of the present invention: the extrusion quality of the brick depends on the plasticity of the raw material and the friction coefficient between the raw material particles. The plasticity of drilling cuttings is poor and it is easy to crack during the extrusion process. The plasticity can be improved by adding coal gangue. In addition, the drilling fluid mixed in the drilling cuttings can produce special ion adsorption and lubrication effects on the surface of the mud particles, improve the flow performance of the mud when being extruded, and it is easier to be extruded and compacted to produce a brick with a smooth and dense surface.

[0034] The drying principle of the present invention: The drying process is the process of evaporation of water in the green body and reduction of volume. Since the drying speed and shrinkage speed inside and outside the green body are always faster outside and slower inside, that is, the surface layer has dried and started to shrink, while the inside is still "intact", once the amount of its shrinkage exceeds the elastic coefficient of the clay (1-2%), it will "burst" the surface of the green body and produce a network of cracks. Characterized by the drying sensitivity coefficient, generally the higher the plasticity of the clay, the higher the drying linear shrinkage rate and the drying sensitivity coefficient, and the easier it is to crack. Therefore, when adding the plastic material coal gangue, add aggregate construction waste (it can also be replaced by other ridge materials) to offset part of the shrinkage and prevent cracking.

[0035] The sintering principle of the present invention is as follows: during the sintering process, the waste glass first softens and becomes a viscous liquid, and wets other powders. Driven by capillary pressure, the particles begin to rearrange. As the temperature further increases, the boron oxide contained in the glass and the boron mud melts to form a large amount of liquid. The liquid phase wets the powder and reacts chemically with it at the same time. After the reaction is completed, the liquid phase forms capillary pressure, which drives the powder to rearrange and complete densification.

[0036] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods, wherein the drilling cuttings used are from a shale gas production company in Chongqing, and its main component is SiO 2 The content is 45.12%, CaO content is 10.59%, SO 3 The content is 4.68%, the BaO content is 6.07%, and the XRD analysis shows that BaSO 4 , construction waste is the debris produced by construction projects.

[0037] Example 1

[0038] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, coal gangue, boron mud, and waste glass, passing drilling cuttings through a 30-mesh sieve, passing coal gangue, waste glass, and boron mud through a 100-mesh sieve, and discharging construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, construction waste, waste glass, and boron mud are mixed in proportions of 40 parts, 40 parts, 10 parts, 5 parts, and 5 parts. Then, 15 parts of water are added to the mixture for granulation, aged for 12 hours, and then a wet embryo sample is vacuum extruded. The sample is dried at 60°C for 2 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1000°C for 60 minutes to obtain a sintered hollow strip sample.

[0039] Example 2

[0040] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, coal gangue, boron mud, and waste glass, passing drilling cuttings through a 30-mesh sieve, passing coal gangue, waste glass, and boron mud through a 100-mesh sieve, and discharging construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, construction waste, waste glass, and boron mud are mixed in proportions of 50 parts, 30 parts, 10 parts, 5 parts, and 5 parts. Then, 15 parts of water are added to the mixture for granulation, aged for 12 hours, and then a wet embryo sample is extruded in vacuum. The sample is dried at 60°C for 3 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1000°C for 60 minutes to obtain a sintered hollow strip sample.

[0041] Example 3

[0042] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, coal gangue, boron mud, and waste glass, passing drilling cuttings through a 30-mesh sieve, passing coal gangue, waste glass, and boron mud through a 100-mesh sieve, and discharging construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, construction waste, waste glass, and boron mud are mixed in proportions of 60 parts, 20 parts, 10 parts, 5 parts, and 5 parts. Then, 15 parts of water are added to the mixture for granulation, aged for 12 hours, and then a wet embryo sample is extruded in vacuum. The sample is dried at 60°C for 2 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1020°C for 60 minutes to obtain a sintered hollow strip sample.

[0043] Comparative Example 1

[0044] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, coal gangue, and waste glass, passing drilling cuttings through a 30-mesh sieve, passing coal gangue and waste glass through a 100-mesh sieve, and discharging construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, construction waste, and waste glass are mixed in proportions of 40 parts, 45 parts, 10 parts, and 5 parts. Then 15 parts of water are added to the mixture for granulation, aged for 12 hours, and then a wet embryo sample is vacuum extruded. The wet embryo sample is dried at 60°C for 3 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1080°C for 60 minutes to obtain a sintered hollow strip sample.

[0045] Comparative Example 2

[0046] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, coal gangue, and waste glass, passing drilling cuttings through a 30-mesh sieve, coal gangue and waste glass through a 100-mesh sieve, and construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, construction waste, and waste glass are mixed in proportions of 50 parts, 35 parts, 10 parts, and 5 parts. Then 15 parts of water are added to the mixture for granulation, aged for 12 hours, and then a wet embryo sample is vacuum extruded. The sample is dried at 60°C for 3 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1080°C for 60 minutes to obtain a sintered hollow strip sample.

[0047] Comparative Example 3

[0048] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, coal gangue, and waste glass, passing drilling cuttings through a 30-mesh sieve, passing coal gangue and waste glass through a 100-mesh sieve, and discharging construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, construction waste, and waste glass are mixed in proportions of 60 parts, 25 parts, 10 parts, and 5 parts. Then 15 parts of water are added to the mixture for granulation, aged for 3 hours, and then a wet embryo sample is vacuum extruded. The sample is dried at 60°C for 12 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1080°C for 60 minutes to obtain a sintered hollow strip sample.

[0049] Comparative Example 4

[0050] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, and coal gangue, wherein the drilling cuttings are screened through a 30-mesh sieve, the coal gangue is screened through a 100-mesh sieve, and the construction waste is screened through a 10-mesh sieve. The screened drilling cuttings, coal gangue, and construction waste are mixed in proportions of 40 parts, 50 parts, and 10 parts. Then 15 parts are added to the mixture for granulation, aged for 12 hours, and then a wet embryo sample is vacuum extruded. The sample is dried at 60°C for 3 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further roasted at 1100°C for 60 minutes to obtain a sintered hollow strip sample.

[0051] Comparative Example 5

[0052] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, and coal gangue, wherein the drilling cuttings are screened through a 30-mesh sieve, the coal gangue is screened through a 100-mesh sieve, and the construction waste is screened through a 10-mesh sieve. The screened drilling cuttings, coal gangue, and construction waste are mixed in proportions of 50 parts, 40 parts, and 10 parts. The sample is dried at 60°C for 3h, dried at 120°C for 6h, kept at 500°C for 30min, treated at 850°C for 30min, and further calcined at 1100°C for 60min to obtain a sintered hollow strip sample.

[0053] Comparative Example 6

[0054] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, construction waste, and coal gangue, passing drilling cuttings through a 30-mesh sieve, passing coal gangue through a 100-mesh sieve, and discharging construction waste through a 10-mesh sieve. The screened drilling cuttings, coal gangue, and construction waste are mixed in proportions of 60 parts, 30 parts, and 10 parts. The sample is dried at 60°C for 3h, dried at 120°C for 6h, kept at 500°C for 30min, treated at 850°C for 30min, and further calcined at 1100°C for 60min to obtain a sintered hollow strip sample.

[0055] Comparative Example 7

[0056] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, shale, clay, feldspar, and brick slag, passing drilling cuttings and shale through a 30-mesh sieve, clay and feldspar through a 100-mesh sieve, and brick slag through a 10-mesh sieve. The screened drilling cuttings, shale, clay, feldspar, and brick slag are mixed in proportions of 40 parts, 40 parts, 5 parts, 5 parts, and 10 parts. The sample is dried at 60°C for 4 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further calcined at 1100°C for 60 minutes to obtain a sintered hollow strip sample.

[0057] Comparative Example 8

[0058] A method for preparing hollow sintered strips using drilling cuttings-based solid waste, which comprises drying and grinding drilling cuttings, shale, clay, feldspar, and brick slag, passing drilling cuttings and shale through a 30-mesh sieve, clay and feldspar through a 100-mesh sieve, and brick slag through a 10-mesh sieve. The screened drilling cuttings, shale, clay, feldspar, and brick slag are mixed in proportions of 50 parts, 30 parts, 5 parts, 5 parts, and 10 parts. The sample is dried at 60°C for 4 hours, dried at 120°C for 6 hours, kept at 500°C for 30 minutes, treated at 850°C for 30 minutes, and further calcined at 1100°C for 60 minutes to obtain a sintered hollow strip sample.

[0059] With reference to the relevant requirements of "Hollow Partition Boards for Buildings" (GB / T 23451-2023), "Test Methods for Building Wall Panels" (GB / T30100-2013) and "Limits of Radioactive Nuclides in Building Materials" (GB 6566-2010), the sintered boards made in the above Examples 1 to 3 and Comparative Tables 1 to 8 were subjected to relevant tests such as compressive strength and weathering resistance. The test results are shown in Table 1 below.

[0060] Table 1 Test results

[0061]

[0062]

[0063] It can be seen from the above that the method provided by the present invention utilizes drilling cuttings-based solid waste to prepare hollow sintered strips, which have good performance, no frost, no cracking, low water absorption, and significantly improved compressive performance, which is more than 2.5 times higher than the industry standard; and the raw materials used in the present invention are all industrial solid waste, and no raw material costs are required. While making profits from the preparation of sintered strips, solid waste treatment fees can be charged at the same time, which has high economic benefits.

[0064] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any person skilled in the art can use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing hollow sintered strips using drilling cuttings-based solid waste, characterized in that: It includes the following steps: S1. Mixing raw materials such as drilling cuttings, coal gangue, boron mud, construction waste and waste glass; S2, adding water, mixing and granulating, and vacuum-extruding the wet embryo sample after aging; S3, shrinking and drying the wet embryo sample at low temperature first, and then removing water and drying at high temperature; S4, pre-sintering to remove chemically bound water in the green body; After re-firing, a sintered strip is obtained.

2. The method according to claim 1, characterized in that In step S1, each raw material is first crushed, and then the drilling cuttings are sieved through a 30-mesh sieve, the coal gangue, boron mud and waste glass are sieved through a 100-mesh sieve, and the construction waste is sieved through a 10-mesh sieve.

3. The method according to claim 1, characterized in that In step S1, the raw materials are calculated by weight, including 40 to 70 parts of drilling cuttings, 15 to 45 parts of coal gangue, 5 to 10 parts of boron mud, 5 to 15 parts of construction waste, and 5 to 10 parts of waste glass.

4. The method according to claim 3, characterized in that The drilling cuttings are 40 to 60 parts, coal gangue is 20 to 40 parts, boric mud is 5 parts, construction waste is 10 parts, and waste glass is 5 parts.

5. The method according to any one of claims 1 to 4, characterized in that The main components of the drilling cuttings are SiO2 of 40-50%, CaO of 10-15%, SO3 of 4-6% and BaO of 6-8%.

6. The method according to claim 1, characterized in that In step S2, the amount of water added is 15-20% of the weight of the dry material.

7. The method according to claim 1, characterized in that In step S2, the aging time is 12 to 72 hours.

8. The method according to claim 1, characterized in that In step S3, the temperature of the low-temperature shrinkage drying is 55-65°C for 1-4 hours; the temperature of the high-temperature dehydration drying is 120°C, and the moisture content of the green body is less than 2% after the high-temperature dehydration drying.

9. The method according to claim 1, characterized in that In step S4, the pre-burning condition is to increase the temperature to 500-550°C at 5°C / min and keep it at that temperature for 30 minutes to eliminate moisture and easily decomposable substances, and then increase the temperature to 800-950°C and pre-burn for 30 minutes.

10. The method according to claim 1, characterized in that In step S4, the calcination condition is 1000°C to 1060°C, and the sintering time is 60 to 120 minutes.

Images