CN110510841B - Muck and silt separating agent and using method thereof - Google Patents

Abstract

The invention discloses a muck silt separating agent, which is prepared by mixing water and diisooctyl succinate sodium sulfonate, wherein the optimal use concentration of the diisooctyl succinate sodium sulfonate is 1.20-1.65%. The silt separating agent utilizes the difference of the specific gravity of silt in the residue soil and the property of sodium diisooctyl succinate sulfonate solution protective colloid to suspend soil particles with lighter specific gravity in the solution, and sand and stone particles with heavier specific gravity naturally settle to the bottom, thereby realizing silt separation. The invention improves the sediment separation efficiency of the sediment, reduces the sediment treatment cost by using a small amount of water, and realizes the recycling of the sediment resources.

Description

Muck and silt separating agent and using method thereof

Technical Field

The invention relates to a separating agent for dregs and silt and a using method thereof.

Background

With the vigorous promotion of national modernization construction, the tunnel construction of various cities is vigorous, but a large amount of engineering dregs can be generated in the development process. Although the state has established clear regulations for waste disposal, the phenomenon of illegal spoil still exists. According to initial investigation and incomplete statistics, the muck with the volume of about 900 can be produced in one subway construction site every day. If the dregs are not treated or effectively utilized, the ecological environment and sustainable development of cities and the periphery are seriously affected, and the problem of recycling the dregs is always solved.

Through research by the inventor, the sand content of the residue soil generated by the development of some tunnels is huge, and the highest sand content can reach eighty percent. At present, a large amount of sand is needed in the urban construction and building industry of China, the price of the sand is continuously increased, the sand is a more precious building material, and the sand contained in the tunnel muck completely meets the building standard. If can carry out effectual processing to the dregs, separate out the sand from the dregs, recycle in the construction, can alleviate the situation that building sand is in short supply greatly, accord with sustainable development theory, effectively solved the dregs processing problem.

The current common silt separation techniques include natural sedimentation and mechanical equipment treatment. The natural settling method utilizes the difference of the density of mud, sand and water to achieve the effect of separating silt through natural standing. The natural precipitation method has the advantages of simplicity, easy operation, no need of complex mechanical equipment and low cost, but also has the defects of long treatment time, general separation effect and low efficiency. The mechanical equipment processing method is to use equipment consisting of a motor, a high-pressure pump, a silt separator, a cleaning tank, a screen and the like to perform separation operation. Although the method has high treatment speed, the method needs to be washed by a large amount of water, has higher cost, is not environment-friendly and has unsatisfactory separation effect.

Disclosure of Invention

In view of the above, the invention provides a silt separating agent and a using method thereof, which are used for solving the problems of high silt treatment cost, difficulty in recycling silt resources and the like, so that when silt is separated from silt, mud and sand are quickly separated, the mud is suspended but not dropped, the sand is settled at the bottom, the boundary is obvious, and the effect is good.

The invention is realized as follows:

a separating agent for dregs and silt: the sodium diisooctyl succinate sulfonate is obtained by mixing sodium diisooctyl succinate sulfonate and water, wherein the mass percentage concentration of the sodium diisooctyl succinate sulfonate is 0.60-2.25%, and the preferable concentration is 1.20-1.65%.

The using method of the silt separating agent comprises the following steps:

(1) conveying the muck and silt separating agent to a first treatment pool, uniformly stirring and standing;

(2) pumping the upper layer slurry in the first treatment tank into a second tank by using a water pump to obtain lower layer coarse sand;

(3) injecting clear water into the first treatment tank, and cleaning coarse sand;

(4) and after the washing is finished, pumping the upper suspension into a third pool for later use, digging out the washed sand, and airing to finish a separation process.

In the step (1), the volume ratio of the muck to the silt separating agent is 1: (2-3).

And (3) in the step (1), stirring and uniformly mixing, and standing for 3-5 minutes.

And (4) continuously adding new muck to be treated into the first treatment tank, adding the upper-layer liquid of the second tank and the upper-layer liquid of the third tank, and repeating the separation step to finish the silt separation again.

The silt separating agent of the invention, diisooctyl succinate sodium sulfonate, is a surfactant, and compared with other surfactants, the diisooctyl succinate sodium sulfonate has better silt separating effect and mud suspension effect, and has no pollution to water quality and soil.

According to literature research, the inventor applies the sodium diisooctyl succinate sulfonate to the field of sediment separation for the first time, which is mainly based on the unique physical and chemical properties of the sodium diisooctyl succinate sulfonate, wherein the concentration of the sodium diisooctyl succinate sulfonate is very critical. The optimal use concentration of the sodium diisooctyl succinate sulfonate is 1.20-1.65%, the invention utilizes the difference of the specific gravity of the silt in the residue soil and the protective property of the sodium diisooctyl succinate sulfonate solution on slurry colloid to suspend the soil particles with lighter specific gravity in the solution, and the sand and stone particles with heavier specific gravity naturally settle to the bottom, thereby achieving the purpose of separating the silt. The silt separating agent takes tunnel muck as a sample, and through repeated experiments, mud and sand are quickly separated when the muck is subjected to silt separation, the mud is suspended but does not fall, the sand is settled at the bottom, the boundary is obvious, and the effect is good.

When the silt separation is carried out, the silt separating agent is combined with physical stirring, so that the silt-containing residue soil is fully mixed with the silt separating agent under the stirring action, the separation efficiency is greatly improved, and the silt separation effect is enhanced. The purposes of recycling the silt separating agent and saving resources are achieved by designing a plurality of treatment pools to transport and using the silt separating agent with specific concentration, the silt separating efficiency is improved, the water consumption is low, the silt treatment cost is reduced, and the recycling of silt resources is achieved.

Drawings

Fig. 1 is a diagram showing the effect of separating silt in different surfactant solutions (concentration of 1.2%) of an experimental soil sample, wherein the surfactant types are diisooctyl succinate sodium sulfonate, calcium lignosulfonate, fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl sulfate, sodium carboxymethylcellulose and hydroxypropyl methyl cellulose from left to right in sequence;

FIG. 2 is a diagram showing the effect of separating silt from a soil sample 1 in sodium diisooctyl succinate sulfonate solutions with different concentrations, wherein the concentration ranges from left to right are 0.30%, 0.60%, 1.50%, 2.10%, 3.00% and 4.50% in sequence;

FIG. 3 is a diagram showing the effect of separating silt from a soil sample 2 in sodium diisooctyl succinate sulfonate solutions with different concentrations, wherein the concentration ranges from left to right are 0.30%, 0.60%, 1.50%, 2.10%, 3.00% and 4.50% in sequence;

FIG. 4 is a block diagram of a process using the silt separating agent of the present invention.

Detailed Description

The invention provides a silt separating agent and a using method thereof, which are used for solving the problems of high cost of muck treatment, difficulty in recycling muck resources and the like.

Example 1

According to the comparison of the experimental effects of different surfactants on silt separation, the surfactant sodium diisooctyl succinate sulfonate is preferably used as the main component of the silt separating agent.

In the embodiment, tunnel muck with a sand content of 60-66% is used as an experimental soil sample, different surfactant solutions with a mass percentage concentration of 1.2% are used as sand separating agents for carrying out experiments, and the muck and the different surfactant solutions are mixed according to a volume ratio of 1:2.5 mixing, fully stirring, standing, and observing the silt separation effect and the slurry suspension effect.

The results of repeated experiments according to the above method are shown in table 1 and fig. 1.

Example 2

According to the comparison of the sand-mud separation experiment effects of the diisooctyl succinate sodium sulfonate with different concentrations, the optimum concentration range of the diisooctyl succinate sodium sulfonate as the sand-mud separating agent is preferably selected, and the concentration range is 1.20-1.65%.

In the embodiment, the method takes the residue soil samples dug by the tunnel construction at two positions of the soil sample 1 (with the sand content of 60-66%) and the soil sample 2 (with the sand content of 78-82%) as experimental soil samples, takes sodium diisooctyl sulfosuccinate solutions with different concentrations as experimental solutions to perform experiments, and comprises the following steps of mixing the residue soil and the sodium diisooctyl sulfosuccinate solutions with different concentrations according to the volume ratio of 1:2.5 mixing, fully stirring, standing for the same time, and observing the silt separation effect and the mud suspension effect (figures 2 and 3).

The conclusion is that for the soil sample 1 and the soil sample 2, the separation effect can be achieved when the concentration range of the sodium diisooctyl succinate sulfonate solution is 0.60-2.25%, wherein 1.20-1.65% is the optimal concentration range, and when the volume ratio of the solution to the muck is 1:2.5, the separation effect is optimal, the sand can be recycled for more than three times, and the separated sand can be directly used as a building material. When the concentration of the solution is too low, mud cannot be suspended, and when the concentration of the solution is too high, part of fine sand can be suspended, so that part of fine sand is lost during separation, and an ideal separation effect cannot be achieved. The actual concentration and water consumption can be adjusted according to the sludge content of the residue soil in the actual sample so as to achieve the optimal sand separating effect.

The invention also provides a using method of the silt separating agent, as shown in figure 4, the method adopts the combination of the silt separating agent and physical stirring, so that the silt-containing residue soil is fully mixed with the silt separating agent under the stirring effect, and the silt separating effect is enhanced. The purposes of recycling the silt separating agent and saving resources are realized by designing a plurality of treatment tanks for transportation and using the silt separating agent.

And (3) conveying the tunnel muck to a first treatment pool, adding the silt separating agent, fully stirring and uniformly mixing, standing for 3-5 min after stirring is finished, and pumping the upper layer slurry in the pool into a second pool by a water pump for later use. And then, injecting a small amount of clear water into the first treatment tank, carrying out secondary cleaning on the sand, pumping the upper suspension into a third tank for later use after the cleaning is finished, digging out the sand from the tank by using an excavator, and transferring the sand to a drying area for drying, thus finishing the primary separation process. And conveying new tunnel muck to be treated to the first treatment tank again, and repeating the steps by using the liquid in the second and third tanks to complete two effective mud-sand separation processes.

The foregoing has described the principles, implementations, and advantages of the present invention. The above examples are merely illustrative of the preferred embodiments of the present invention, and all such modifications and variations are within the scope of the invention as determined by the appended claims.

Claims (3)

1. The residue soil and sediment separating agent is characterized in that: the sand-silt separating agent is prepared by mixing diisooctyl succinate sodium sulfonate and water, wherein the mass percentage concentration of the diisooctyl succinate sodium sulfonate is 1.20-1.65%, and when the sand-silt separating agent is used, the volume ratio of the muck to the sand-silt separating agent is 1: 2.5.

2. the method of using the silt separating agent of claim 1, which comprises the steps of:

(1) conveying the muck and silt separating agent to a first treatment pool, uniformly stirring and standing;

(2) pumping the upper layer slurry in the first treatment tank into a second tank by using a water pump to obtain lower layer coarse sand;

(3) injecting clear water into the first treatment tank, and cleaning coarse sand;

(4) and after the washing is finished, pumping the upper suspension into a third pool for later use, digging out the washed sand, and airing to finish a separation process.

3. Use according to claim 2, characterized in that: and (3) in the step (1), stirring and uniformly mixing, and standing for 3-5 minutes.

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