CN1109090A

CN1109090A - Soil anti-penetrating agent and its application

Info

Publication number: CN1109090A
Application number: CN95110914A
Authority: CN
Inventors: 黄剑朎; 孙达旺; 朱琰; 张金池
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 1995-01-23
Filing date: 1995-01-23
Publication date: 1995-09-27

Abstract

The anti-percolating agent for soil mainly contains tannin, water glass and molysite and may be applied in the condition of existant water source by digging a water pit. The amount of anti-percolating agent to be used does not need high precise and the requirement to operator's skill is lower, so it is widely used for sand control, irrigation, reservoir, fish pond, saltworks, etc.

Description

Soil anti-penetrating agent and its application

The invention belongs to soil remediation chemical grouting sand fixing technology.

The retaining of soil, water-holding power are very important indexs in some occasion.With retaining dyke, reservoir, fishpond and salt pan or the like, all run into the seepage losing issue that how as far as possible reduces water as dune-fixating forestation, irrigation through regular meeting; Fix the sand problem if can solve the retaining in desert, the desertification problem of administering the puzzlement whole world also just will become much easier.

As far back as nineteen fifty-two, Wook and Weed once proposed to utilize crude substance to cook soil conditioner; 1969, Mark extracted the polymer substance saccharan and makees soil improvement agent from plant; 1970, United States Patent (USP) 3530081 reported that also usefulness is rich in the bark of tannin and the mixture of ironic hydroxide carries out chemical grouting, can strengthen soil property intensity and stability.Herrick.F.W adds formaldehyde in report in 1980 with tannin, metal-salt and makes the chemical grouting agent, forms stable anti-hydrogel, to strengthen the intensity and the water tolerance on stratum.The eighties, oil-rich countries such as the U.S., USSR (Union of Soviet Socialist Republics), Belgium, Kuwait and Libya, numerous and confused research and utilization petrochemicals are made soil improvement agent, be used for the pre-treatment of big area sand ground afforestation, ground dune-fixating forestations such as motorway both sides, harbour and nurseries, obtained certain effect.China also introduce this technology in Shandong, the Shanxi chemical treatment small-scale test of carrying out soil improvement.In the above-mentioned the whole bag of tricks, the pharmacy effect that has is not satisfactory, and the dosing that has is big, cost is high, also has certain toxicity in the medicament that has.

The goal of the invention of present technique is a kind of low cost of development, easy working novel nontoxic soil anti-penetrating agent.

Soil anti-penetrating agent main component among the present invention is tannin, water glass and molysite.Tannin is a plant polyphenol, is a kind of natural polymer organism, and the amount of being is the main component of inexpensive important forest products resource-tannin extract extensively.Its ortho position phenolic hydroxyl group has extremely strong coordination ability to metal ion.In the inorganics crystal of the soil grains of sand, there is high volence metal ion, so tannin has good affine performance to the soil grains of sand with residue combining power.The main component of water glass is water glass (Na ₂SiO ₃NH ₂O), polymerization takes place easily, also can produce the chemical reaction of extra-heavy to the soil grains of sand.Molysite can react with tannin and water glass, strengthens anti-seepage effect, and in and the alkalescence of water glass, to adjust the pH value of permeability-reducing admixture, avoid the potential of hydrogen of soil is produced excessive influence.Because soil anti-penetrating agent has good affine performance to the grains of sand in the soil; after soil anti-penetrating agent grouting (or sprinkling) is in soil; produce interlinkage; coordination and polymerization; (or face of land) gelling becomes macromolecular scaffold in the soil gap; with soil is filler; form artificial organic and inorganic-soil composite hydrophilic impervious barrier; the seepage because this impervious barrier can prevent water from running off effectively; therefore; be widely used in dune-fixating forestation; irrigate and use the retaining dyke; reservoir; the antiseepage of occasion such as fishpond and salt pan is handled, and also can be used for fly ash in electric power plant and handles and prevent land management and water resources protection field such as groundwater pollution.

Specify the prescription and the using method of permeability-reducing admixture below in conjunction with each embodiment.

Embodiment 1:

The permeability-reducing admixture prescription is as follows:

1. water glass 510 ^#(Nanjing inorganic chemical industry factory product) ... 1% aqueous solution

2. larch extract (tannin content is about 58%, and Yakeshi tannin extract factory produces) ... 1% aqueous solution

3. iron trichloride (technical grade) ... 0.5% aqueous solution

After the aqueous solution of above-mentioned three kinds of medicaments (order by merging is not limit), promptly get liquid antiseepage hydrophilic colloid.Above-mentioned seepage-proof liquid is sprayed on the sand surface with the mode of spraying, can forms fluid-tight black tannin one iron of one deck one water glass film.The consumption of every kind of component seepage-proof liquid is 0.3L/m ²

Embodiment 2:

The permeability-reducing admixture prescription is as follows:

1. water glass 510 ^#4% aqueous solution

2. larch extract ... 4% aqueous solution

3. iron trichloride ... 2% aqueous solution

The aqueous solution of above-mentioned three kinds of medicaments poured into successively dig in common forest land, the degree of depth is in the heatable adobe sleeping platform of 30cm.Must be during grouting according to first water glass, the order of back tannin, iron trichloride also must pour into a kind of medicament down again after last a kind of medicament all infiltrates in the soil.Every kind of component chemical liquid consumption is 4L/m ²

After grouting treatment finishes, pour into the saturated common salt aqueous solution that seepage is better than fresh water in the heatable adobe sleeping platform and test, the degree of depth is that all miss at 7 days rears of the saturated common salt aqueous solution of 15cm in the heatable adobe sleeping platform; The saturated common salt aqueous solution in the control group heatable adobe sleeping platform, i.e. all leakages in 3 hours.

Embodiment 3:

The permeability-reducing admixture prescription is with embodiment 2.

The aqueous solution of above-mentioned three kinds of medicaments poured into successively dig in the building soil heatable adobe sleeping platform loosely organized, that voidage is big.Grouting requires with embodiment 2.Every kind of component chemical liquid consumption is 4L/m ²

Grouting can be to pour into the saturated common salt aqueous solution that seepage is better than fresh water to test toward heatable adobe sleeping platform in after finishing, and all miss at four days rears of the saturated common salt aqueous solution that the interior degree of depth of heatable adobe sleeping platform is 15cm; The saturated common salt aqueous solution in the control group heatable adobe sleeping platform, i.e. all leakages in 0.5 hour.

Embodiment 4:

The permeability-reducing admixture prescription is as follows:

1. water glass 510 ^#1% aqueous solution

2. larch extract ... 1% aqueous solution

3. iron trichloride ... 0.5% aqueous solution

With the aqueous solution of above-mentioned three kinds of medicaments pour into successively with the seashore sandy soil surround, in the sand pit of the high 10cm of dykes and dams, grouting requires with embodiment 2.Every kind of component chemical liquid consumption is 5L/m ²

The grouting back that finishes promptly pours into the saturated common salt aqueous solution in the sand pit and tests, and the degree of depth is that all miss at 1 day rear of the saturated common salt aqueous solution of 5cm in the sand pit; The saturated common salt aqueous solution in the control group sand pit, i.e. all leakages in 3 hours.

Embodiment 5:

The permeability-reducing admixture prescription is as follows:

1. water glass 510 ^#5% aqueous solution

2. larch extract ... 2.5% aqueous solution

3. iron trichloride ... 2.5% aqueous solution

With the aqueous solution of above-mentioned three kinds of medicaments pour into successively with the seashore sandy soil surround, in the sand pit of the high 20cm of dykes and dams, grouting requires with embodiment 2.Every kind of component chemical liquid consumption is 4L/m ²

The grouting back that finishes promptly pours into the saturated common salt aqueous solution in the sand pit and tests, and the degree of depth is that all miss at 3 days rears of the saturated common salt aqueous solution of 15cm in the sand pit; The saturated common salt aqueous solution in the control group sand pit, i.e. all leakages in 3 hours.

In the various embodiments described above, in preparation during water glass solution, for preventing that water glass from pH＜10 o'clock hydrolysis, influencing anti-seepage effect, should be earlier the pH regulator of water be added water glass again after more than the pH10 with sodium hydroxide; During preparation tannin extract solution, the pH value of water should be not less than 7.When with 400 ^#Water glass replaces 510 ^#Water glass, the condensed tannin extract of obtaining through refining with other seeds replaces larch extract, with ferric sulphate (Fe ₃(SO ₄) ₂) when replacing iron trichloride, the proportioning of the various embodiments described above, consumption, using method and effect are basic identical.

Soil seepage control technique provided by the present invention as long as possess certain water condition at the construction field (site), digs a puddle and can prepare construction.The allotment metering of permeability-reducing admixture is also very extensive, therefore, not high to operator's technical requirements.Various medicaments in the permeability-reducing admixture not only can not produce soil and pollute, and can also increase organism, activated silica and ferro element etc. in the soil, therefore, can be widely used in dune-fixating forestation, irrigate with the antiseepage of retaining dyke and handle.The antiseepage that also can be used for occasions such as reservoir, fishpond and salt pan is handled, the antiseepage processing in fly ash in electric power plant processings, poison sewage drain way, canal, riverbed and prevent land management and water resources protection field such as groundwater pollution.

Claims

1, a kind of soil anti-penetrating agent that contains tannin, the main component that it is characterized in that soil anti-penetrating agent is tannin, water glass and molysite.

2, a kind of using method of soil anti-penetrating agent as claimed in claim 1 is characterized in that with tannin, water glass and molysite the aqueous solution after soluble in water respectively, and according to first water glass, the order of back tannin, molysite is carried out grouting treatment to soil.

3, a kind of using method of soil anti-penetrating agent as claimed in claim 1 is characterized in that with tannin, water glass and molysite the aqueous solution after soluble in water respectively, is pre-mixed the back and sprays the soil surface that required antiseepage handles and get final product.