Reinforcing agent for modifying marine silt by using all-solid waste as well as preparation method and application of reinforcing agent

Abstract

The invention discloses a reinforcing agent for modifying marine facies sludge by using all solid wastes and a preparation method and application thereof, and belongs to the field of marine facies sludge solidification, the reinforcing agent comprises 50-80% of a main material, 10-50% of a structure modifier and 5-30% of an activator, the specific surface areas of the main material, the structure modifier and the activator are greater than or equal to 350m < 2 > / kg, and the main material, the structure modifier and the activator are all derived from solid wastes. The preparation method is simple to operate, the prepared modified marine facies sludge reinforcing agent is added into marine facies sludge according to 5-50% of the weight of the marine facies sludge and is uniformly mixed, so that rapid dehydration and hardening of the marine facies dredged sludge can be promoted, the dredged sludge is rapid in curing and high in strength, the marine facies sludge can be efficiently recycled, and the required raw materials are solid wastes which are environment-friendly. The price and the cost are low, and popularization of resource utilization of the marine dredged sludge is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of marine sludge solidification, and specifically is a solidifying agent for modifying marine sludge using all-solid waste, and a preparation method and application thereof. Background Art

[0003] At present, solidification treatment technology is one of the main ways to utilize marine dredged sludge as a resource. By adding special solidification materials to the dredged sludge, stirring, mixing and curing, a series of chemical reactions occur between the sludge and the solidification materials to form solidified soil with good engineering properties, which can be used in projects such as land reclamation, road pouring, filling, and embankment protection.

[0004] Among the existing marine dredged sludge solidification materials, cement-based solidification materials are generally used, such as the Chinese patent documents disclosed in publication numbers CN111574076 A and CN 118239721 A. The cost of the cement-based marine sludge solidifying agents involved in the above documents is relatively high, which seriously affects the promotion and application of the resource utilization of marine dredged sludge.

[0005] Therefore, there is an urgent need to develop a marine dredged sludge hardener that can improve the structure of marine sludge, make the marine sludge harden quickly, have high strength and low cost, and enable efficient resource utilization of marine dredged sludge. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a strengthening agent for modifying marine sludge using all-solid waste, which can promote the rapid dehydration and hardening of marine dredged sludge. The dredged sludge solidifies quickly and has high strength, and the marine sludge can be efficiently utilized as a resource. Moreover, the required raw materials are all solid waste, which is inexpensive and low in cost, and is conducive to the promotion of the resource utilization of marine dredged sludge.

[0007] In order to solve the above technical problems, the present invention provides a strengthening agent for modifying marine sludge using all-solid waste, which includes 50-80% main material, 10-50% structure modifier and 5-30% activator by weight percentage, wherein the main material is a mixture of one or more of water slag powder, stone powder or steel slag powder; the structure modifier is a mixture of one or more of waste incineration slag powder, fly ash or calcium carbonate powder; the activator is a mixture of one or two of alkali slag powder or magnesium slag powder.

[0008] As a further description of the above technical solution:

[0009] The specific surface area of ​​slag powder is ≥350m 2 / kg; the specific surface area of ​​stone powder ≥350m 2 / kg; the specific surface area of ​​steel slag powder ≥350m 2 / kg.

[0010] As a further description of the above technical solution:

[0011] The specific surface area of ​​the waste incineration slag powder is ≥350m 2 / kg; specific surface area of ​​fly ash ≥350m 2 / kg; the specific surface area of ​​calcium carbonate powder is ≥350m 2 / kg.

[0012] As a further description of the above technical solution:

[0013] The specific surface area of ​​the alkali slag powder is ≥350m 2 / kg; the specific surface area of ​​magnesium slag powder is ≥350m 2 / kg.

[0014] The present invention adds a structural modifier to the marine dredged sludge strengthening agent, which can promote the rapid dehydration and hardening of the marine dredged sludge. The dredged sludge solidifies quickly and has high strength, and the marine sludge can be efficiently utilized as a resource. Moreover, the raw materials used are all solid wastes, which are low in price and cost, and can treat waste with waste and turn waste into treasure. The invention has a broad application prospect. The structural modifier is added to the marine sludge at 15% of the weight of the sludge, the solid content of the marine dredged sludge slurry is controlled to be 65%, and the sludge is injected into a mold for curing for 28 hours to obtain marine sludge solidified soil with a compressive strength of 2.2MPa, which can meet the requirements of various engineering soils.

[0015] In order to solve the above technical problems, the present invention also provides a method for preparing a strengthening agent using all-solid waste to modify marine sludge, comprising the following steps:

[0016] 1) Weigh the main ingredients according to the proportion, and stir them in a blender for 1 to 3 minutes to mix them evenly to obtain the main ingredient;

[0017] 2) adding the structural modifier required for the ingredient measurement to the main ingredient of step 1), and rapidly stirring for 3 to 5 minutes to mix evenly to obtain a mixed material;

[0018] 3) adding the required amount of activator to the mixed material of step 2), and rapidly stirring for 5 to 10 minutes to mix evenly, to obtain a modified marine sludge solidifying agent;

[0019] The main material is one or a mixture of water slag powder, stone powder or steel slag powder, and the specific surface area of ​​the main material is ≥350m 2 / kg;

[0020] The structural modifier is one or a mixture of waste incineration slag powder, fly ash or calcium carbonate powder, and the specific surface area of ​​the structural modifier is ≥350m 2 / kg;

[0021] The activator is one of alkali slag powder or magnesium slag powder or a mixture of the two, and the specific surface area of ​​the activator is ≥350m 2 / kg.

[0022] In order to solve the above technical problems, the present invention also provides the use of this solidifying agent for modifying marine sludge using all-solid waste in the treatment of marine sludge. Specifically, the modified marine sludge solidifying agent is added to the marine sludge at 5 to 50% of the weight of the marine sludge and mixed evenly, and the solid content of the marine sludge is controlled to be 50 to 65%.

[0023] Preferably, the modified marine sludge solidifying agent accounts for 15% of the weight of the marine sludge, and the solid content of the marine sludge is 65%.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. In the process of preparing a strengthening agent using all-solid waste to modify marine sludge, the raw materials used are all solid waste, which is cheap and low in cost. It can treat waste with waste and turn waste into treasure, and has a broad application prospect;

[0026] 2. The marine sludge strengthening agent prepared by the present invention contains a structural modifier, which can promote the rapid dehydration and hardening of the marine sludge, and the dredged sludge solidifies quickly and has high strength, so that the marine sludge can be efficiently utilized as a resource. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] To avoid repetition, the raw materials involved in this specific embodiment are described as follows, and will not be repeated in the examples:

[0029] A reinforcing agent for modifying marine sludge using all-solid waste, comprising a main material, a structure modifier and an activator, wherein the main material is a mixture of water slag micropowder, stone powder or steel slag micropowder, and the specific surface area of ​​the water slag micropowder is ≥350m 2 / kg; the specific surface area of ​​stone powder ≥

[0030] 350m 2 / kg; the specific surface area of ​​steel slag powder ≥350m 2 / kg;

[0031] The structural modifier is one or a mixture of waste incineration slag powder, fly ash or calcium carbonate powder. The specific surface area of ​​waste incineration slag powder is ≥350m 2 / kg; specific surface area of ​​fly ash ≥350m 2 / kg; the specific surface area of ​​calcium carbonate powder is ≥350m 2 / kg;

[0032] The activator is either alkali slag powder or magnesium slag powder or a mixture of the two. The specific surface area of ​​the alkali slag powder is ≥350m 2 / kg; the specific surface area of ​​magnesium slag powder is ≥350m 2 / kg.

[0033] Example 1

[0034] The present embodiment provides a strengthening agent for modifying marine silt using all-solid waste, including 50% slag powder, 10% stone powder, 15% fly ash, 15% calcium carbonate powder, 5% alkali slag powder and 5% magnesium slag powder.

[0035] The preparation method of the modified marine sludge solidifying agent comprises the following steps:

[0036] 1) Weigh 50% of slag powder and 10% of stone powder in a blender and stir quickly for 2 minutes to mix evenly to obtain the main material;

[0037] 2) adding 15% fly ash and 15% calcium carbonate powder to the main material of step 1), stirring rapidly for 5 minutes to mix evenly, to obtain a mixed material;

[0038] 3) Add 5% alkali slag powder and 5% magnesium slag powder to the mixed material in step 2), and stir quickly for 5 minutes to mix evenly, so as to prepare the modified marine sludge solidifying agent.

[0039] The modified marine sludge solidifying agent is added to the marine sludge at 20% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry is controlled to be 50%, and injected into a mold for curing for 28 hours to obtain a marine sludge solidified body with a compressive strength of 1.4 MPa.

[0040] Example 2

[0041] The present embodiment provides a strengthening agent for modifying marine sludge using all-solid waste, including 30% water slag powder, 10% stone powder, 20% steel slag powder, 15% waste incineration slag powder, 15% calcium carbonate powder and 10% alkali slag powder.

[0042] The preparation method of the modified marine mud-removing and strengthening agent comprises the following steps:

[0043] 1) Weigh 50% of water slag powder, 10% of stone powder and 20% of steel slag powder, stir them in a mixer for 5 minutes and mix them evenly to obtain the main material;

[0044] 2) adding 15% of waste incineration slag powder and 15% of calcium carbonate powder to the main material of step 1), stirring rapidly for 5 minutes to mix evenly, to obtain a mixed material;

[0045] 3) Add 10% alkali residue powder to the mixed material in step 2), stir rapidly for 5 minutes to mix evenly, and the modified marine sludge solidifying agent can be prepared.

[0046] The modified marine sludge strengthening agent is added to the marine sludge at 10% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry is controlled to be 60%, and injected into a mold for curing for 28 hours to obtain a marine sludge solidified body with a compressive strength of 1.2 MPa.

[0047] Example 3

[0048] The present embodiment provides a strengthening agent for modifying marine sludge using all-solid waste, including 50% water slag powder, 25% calcium carbonate powder, 15% alkali slag powder and 10% magnesium slag powder.

[0049] The preparation method of the modified marine sludge solidifying agent comprises the following steps:

[0050] 1) Weigh 50% of the water slag powder and mix it in a blender for 1 minute to obtain the main material;

[0051] 2) adding 25% of calcium carbonate powder to the main material of step 1), stirring rapidly for 3 minutes to mix evenly, to obtain a mixed material;

[0052] 3) Add 15% alkali slag powder and 10% magnesium slag powder to the mixed material in step 2), and stir quickly for 8 minutes to mix evenly, so as to prepare the modified marine sludge solidifying agent.

[0053] The modified marine sludge strengthening agent is added to the marine sludge at 15% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry is controlled to be 65%, and injected into a mold for curing for 28 hours to obtain a marine sludge solidified body with a compressive strength of 2.2 MPa.

[0054] Example 4

[0055] The present embodiment provides a strengthening agent for modifying marine sludge using all-solid waste, including 40% water slag powder, 30% steel slag powder, 10% waste incineration slag powder, 5% fly ash and 15% alkali slag powder.

[0056] The preparation method of the modified marine sludge solidifying agent comprises the following steps:

[0057] 1) Weigh 50% of water slag powder and 30% of steel slag powder and mix them evenly in a mixer for 3 minutes to obtain the main material;

[0058] 2) adding 10% of waste incineration slag powder and 5% of fly ash to the main material of step 1), stirring rapidly for 5 minutes to mix evenly, to obtain a mixed material;

[0059] 3) Add 15% alkali residue powder to the mixed material in step 2), and stir rapidly for 8 minutes to mix evenly, so as to obtain a modified marine sludge solidifying agent.

[0060] The modified marine sludge strengthening agent is added to the marine sludge at 8% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry is controlled to be 60%, and injected into a mold for curing for 28 hours to obtain a marine sludge solidified body with a compressive strength of 0.9 MPa.

[0061] Example 5

[0062] The present embodiment provides a strengthening agent for modifying marine sludge using all-solid waste, including 30% stone powder, 30% steel slag powder, 20% calcium carbonate powder, 15% alkali slag powder and 5% magnesium slag powder.

[0063] The preparation method of the modified marine sludge solidifying agent comprises the following steps:

[0064] 1) Weigh 30% of stone powder and 30% of steel slag powder, stir them in a mixer for 2 minutes to mix them evenly to obtain the main material;

[0065] 2) adding 20% ​​of calcium carbonate powder to the main material of step 1), stirring rapidly for 5 minutes to mix evenly, to obtain a mixed material;

[0066] 3) Add 15% of alkaline slag powder and 5% of magnesium slag powder to the mixed material in step 2), and stir quickly for 8 minutes to mix evenly, so as to obtain a modified marine sludge solidifying agent.

[0067] The modified marine sludge strengthening agent is added to the marine sludge at 20% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry is controlled to be 50%, and injected into a mold for curing for 28 hours to obtain a marine sludge solidified body with a compressive strength of 1.8 MPa.

[0068] Comparative Example 1

[0069] A marine sludge solidifying agent comprises 50% of slag powder, 15% of stone powder, 10% of fly ash and 25% of calcium carbonate powder.

[0070] The preparation method of the marine sludge solidifying agent is as follows: 50% of slag powder and 15% of stone powder are weighed and mixed in a mixer for 1 minute to obtain a main material; 10% of fly ash and 25% of calcium carbonate powder are added to the mixed main material, and the mixture is mixed for 3 minutes to obtain a marine sludge solidifying agent.

[0071] The above-mentioned marine sludge strengthening agent was added to the marine sludge at 15% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry was controlled to be 65%, and it was injected into the mold for curing for 28 hours. The compressive strength of the marine sludge solidified body was tested to be 0.58MPa.

[0072] Comparative Example 2

[0073] A marine sludge strengthening agent comprises 50% of water slag micropowder, 20% of stone powder and 30% of alkali slag micropowder.

[0074] The preparation method of the marine sludge solidifying agent is as follows: 50% of water slag micropowder and 20% of stone powder are weighed and mixed in a mixer for 1 minute to obtain a main material; 30% of alkali slag micropowder is added to the mixed main material, and the mixture is mixed for 8 minutes to obtain a marine sludge solidifying agent.

[0075] The above-mentioned marine sludge strengthening agent was added to the marine sludge at 15% of the weight of the marine sludge, the solid content of the marine dredged sludge slurry was controlled to be 65%, and it was injected into the mold for curing for 28 hours. The compressive strength of the marine sludge solidified body was tested to be 0.43MPa.

[0076] Comparative Example 3

[0077] A marine mud solidifying agent comprises 50% of water slag powder, 20% of stone powder and 30% of steel slag powder.

[0078] The preparation method of the marine sludge solidifying agent is as follows: 50% of water slag micro powder, 20% of stone powder and 30% of steel slag powder are weighed, mixed in a mixer quickly for 10 minutes and mixed evenly to obtain the marine sludge solidifying agent.

[0079] The modified marine sludge strengthening agent was added to the marine sludge at 15% of the weight of the marine sludge, the solid content of the marine dredged sludge was controlled to be 65%, and the slurry was injected into a mold for curing for 28 hours. The compressive strength of the marine sludge solidified body was tested to be 0.41 MPa.

[0080] It can be concluded from the above embodiments and comparative examples that the marine dredged sludge strengthening agent prepared by the present invention contains a structure modifier and an active agent, which can promote the rapid dehydration and hardening of the marine dredged sludge. The dredged sludge solidifies quickly and has high strength, and the marine sludge can be efficiently utilized as a resource.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. A strengthening agent for modifying marine sludge using all-solid waste, comprising, by weight percentage, 50-80% of a main material, 10-50% of a structure modifier and 5-30% of an activator, characterized in that: The main material is one or a mixture of water slag powder, stone powder or steel slag powder; The structural modifier is one or a mixture of waste incineration slag powder, fly ash or calcium carbonate powder; The activator is one of alkali slag micropowder and magnesium slag micropowder or a mixture of the two.

2. The strengthening agent for modifying marine sludge using all-solid waste according to claim 1, characterized in that: The specific surface area of ​​the water slag powder is ≥350m 2 / kg; the specific surface area of ​​stone powder ≥350m 2 / kg; the specific surface area of ​​steel slag powder ≥350m 2 / kg.

3. The strengthening agent for modifying marine sludge using all-solid waste according to claim 1, characterized in that: The specific surface area of ​​the waste incineration slag powder is ≥350m 2 / kg; specific surface area of ​​fly ash ≥350m 2 / kg; the specific surface area of ​​calcium carbonate powder is ≥350m 2 / kg.

4. The strengthening agent for modifying marine sludge using all-solid waste according to claim 1, characterized in that: The specific surface area of ​​the alkali slag powder is ≥350m 2 / kg; the specific surface area of ​​magnesium slag powder is ≥350m 2 / kg.

5. The method for preparing the modified marine sludge solidifying agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: 1) Weigh the main ingredients according to the proportion, and stir them in a blender for 1 to 3 minutes to mix them evenly to obtain the main ingredient; 2) adding the structural modifier required for the ingredient measurement to the main ingredient of step 1), and rapidly stirring for 3 to 5 minutes to mix evenly to obtain a mixed material; 3) adding the required amount of activator to the mixed material of step 2), and rapidly stirring for 5 to 10 minutes to mix evenly, to obtain a modified marine sludge solidifying agent; The main material is one or a mixture of water slag powder, stone powder or steel slag powder; The structural modifier is one or a mixture of waste incineration slag powder, fly ash or calcium carbonate powder; The activator is one of alkali slag micropowder and magnesium slag micropowder or a mixture of the two.

6. The method for preparing the modified marine sludge solidifying agent according to claim 5, characterized in that: The specific surface area of ​​the main material is ≥350m 2 / kg, the specific surface area of ​​the structure modifier is ≥350m 2 / kg, the specific surface area of ​​the activator is ≥350m 2 / kg.

7. Use of the modified marine sludge solidifying agent according to any one of claims 1 to 4 in treating marine sludge.

8. The use of the modified marine sludge solidifying agent according to claim 7 in treating marine sludge, characterized in that: The solidifying agent is added into the marine sludge at 5-50% of the weight of the marine sludge and mixed evenly, and the solid content of the marine sludge is controlled to be 50-65%.

9. The use of the modified marine sludge solidifying agent according to claim 8 in treating marine sludge, characterized in that: The solidifying agent of the modified marine sludge accounts for 15% of the weight of the marine sludge, and the solid content of the marine sludge is 65%.