Dust-removing composition for treating dusty surfaces

FIELD: chemistry.

SUBSTANCE: dust-removing composition for treating dusty surfaces contains a polyelectrolyte and water, and is characterised by that it contains aqueous solutions of an alkali metal polyacrylate and a copolymer of acrylamide with acrylic acid derivatives, wherein copolymers of acrylamide with dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate or dimethylaminopropyl acrylamide are used, the alkali metal polyacrylate solution has concentration of 0.1-1.0 wt %, the solution of the copolymer of acrylamide with acrylic acid derivatives has concentration of 0.05-0.5 wt %.

EFFECT: good erosion resistance of the treated surface.

1 cl

 

The invention relates to the field of environmental protection in iron ore, coal, construction, energy industries, as well as during the construction and operation of roads, and can be used for fastening the dangerous erosion of dust-forming surfaces of the mineral composition of the tailings, dumps, piles of rocks, and in the contaminated areas and roadsides of roads.

Known (SU authorship 1355723) preventive composition to prevent blowing of fine materials containing urea-formaldehyde resin, curing agent, calcium chloride and water.

A disadvantage of known composition are lowered resistance resulting from the destruction of water-soluble polymer precipitation, and low mechanical strength of the resulting polymer film vibration that occurs during transport of fine goods and negative temperatures below minus 20°C.

Also known (SU authorship 1317160) the composition for fixing dusty surfaces, in order to improve the effectiveness of the consolidation by creating a non-dusting layer produce alkaline prophylactic treatment, including acetonitrile resin, chloride salt, the poly is relaid, sulfite-alcohol wine and other

The disadvantage of this composition should recognize its shortcomings are due to the effects of rainfall, drastically reducing the concentration of the solution as a result of erosion of the surface layer, and the high cost of operating components for preparation of the alkaline solution.

Known (EN, application 93011503/03) organic composition for fixing dusty surfaces in the form of 2-10% aqueous solution smilenov tall oil pitch. The latter, being deposited on the surface, is treated with a mineral or organic acid.

The drawbacks of composition are introduced into the structure of the processed surface of the heavy aromatics, which has a negative environmental impact, and corrosion of vehicles and mechanisms in operation.

Known (SU authorship 1030565) the composition for fixing dusty surfaces, including urea-formaldehyde resin and an aqueous solution of inorganic acid.

The disadvantages of this structure are the selection of environmentally hazardous formaldehyde in the formation and operation of the polymer film, poor wettability with respect to the iron-containing minerals, corrosion of vehicles and machinery, due to the high concentration the AI inorganic acid in solution.

The closest analogue of the developed composition can be recognized (SU authorship 1190067) the composition for fixing dusty surfaces, comprising the polyelectrolyte in the form of a copolymer of alkali metal methacrylate and methyl methacrylate, as well as water.

The composition with the positive environmental qualities has poor wettability of the surfaces of mineral particles, unsatisfactory surface tension and the strength of the film, resulting in under the influence of atmospheric factors (solar radiation, wind erosion, precipitation) protective polymer film is destroyed.

Technical result achieved during the implementation of the developed composition, is to increase the strength and durability of the coating of dusty surfaces, which improves the environmental situation in the area of dangerous erosion of dusty surfaces.

To achieve the technical result of the proposed use of the composition for treatment of dust-forming surfaces containing aqueous solutions of alkali metal polyacrylate and copolymer of acrylamide derivative of acrylic acid, used copolymers of acrylamide with dimethylaminoethylacrylate, dimethylaminoethylmethacrylate or dimethylaminopropylamine, and the concentration of the solution of alkali metal polyacrylate SOS is to place 0,1-1,0% (mass), as the concentration of the solution of a copolymer of acrylamide derivative of acrylic acid is 0.05 to 0.5% (mass).

Really use polyacrylate sodium or potassium.

The developed structure is based on the joint use of differently charged high molecular weight polyelectrolytes, one of which (polyacrylate sodium or potassium) connects substances dust due to electrostatic interaction, and a copolymer of acrylamide neutralizes excess electric charge on erosive dangerous dusty surface with the formation of a mesh structure polymer (--) - polymer (+), thereby increasing the strength of binding dust particles anionic polyelectrolyte.

The application of aqueous solutions of polyelectrolytes on erosive dangerous dusty surface produced by the queue at the beginning of the applied aqueous solution of alkali metal acrylate, and then an aqueous solution of a copolymer of acrylamide. The time interval between application of the two solutions depends on the external conditions (temperature, humidity), and the size of the retained dust particles and their nature.

In the preferred implementation uses the solutions of specified concentrations in the amount of from 1.5 to 2.5 g/m2square.

Research on the effectiveness of the developed composition was carried out according erosion resistance of the sample taken from the dumps heat the new power plant, working coal (Kemerovo). Erosion resistance was evaluated by the magnitude of the weight loss of the treated sample at time intervals of 4-6 hours after treatment with solutions of polyelectrolytes within the composition. The sample is a metal tray area of 50 cm2with a wall height of 1 cm sample Mass of approximately 400 grams. After application of the solutions and their drying on a tray directs the flow of air using a fan for 40 hours (8 days and 5 hours). The loss in weight of less than 8% was accepted as satisfactory.

1. The first experiment was conducted using a composition used as the nearest equivalent. The sample weight 410 grams was treated with composition containing (%):

copolymer of 50 mol.% methacrylate alkaline metal
and 50 mol.% methylmethacrylate10
water90.

After 6-hour exposure for the full formation of a film on the surface of the sample surface blew over 40 hours. Weight loss was 9.7%.

2. A similar sample weight 405 g treated initially with an aqueous solution of polyacrylate sodium concentration is a function of 0.5% (mass) in an amount of 2 g/m 2and then an aqueous solution of a copolymer of acrylamide with dimethylaminoethylacrylate concentration of 0.25% (mass) in an amount of 1.5 g/m2. Blowing air started within 1 hour after termination of treatment. Conditions of ventilation were similar to example 1. Weight loss was 4.4%

3. The experiment is carried out analogously to example 2, but using the solution of sodium polyacrylate concentration of 0,1% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminoethylmethacrylate concentration of 0.05% (mass). Weight loss was 6.2%.

4. The experiment is carried out analogously to example 2, but using a solution of potassium polyacrylate concentration of 1.0% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminopropylamine of 0.5% (mass). Weight loss was 3.7%.

5. The experiment is carried out analogously to example 2, but using the solution of sodium polyacrylate concentration of 0.5% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminoethylmethacrylate 0,1% (mass). Weight loss was 5.1%.

6. The experiment is carried out analogously to example 2, but using a solution of potassium polyacrylate concentration of 0,1% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminopropylamine of 0.5% (mass). Weight loss was 4.8%.

7. The experiment is carried out analogously to example 2, but using the solution in which acrylate potassium concentration of 0.08% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminopropylamine of 0.5% (mass). Weight loss amounted to 9.2%.

8. The experiment is carried out analogously to example 2, but using a solution of potassium polyacrylate concentration of 1.0% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminoethylmethacrylate 0,003% (mass). Weight loss amounted to 10.7%.

9. The experiment is carried out analogously to example 2, but using a solution of potassium polyacrylate concentration of 1.2% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminopropylamine of 0.3% (mass). Weight loss was 9.8%.

10. The experiment is carried out analogously to example 2, but using the solution of sodium polyacrylate concentration of 0.9% (mass) in the same amount and the solution of a copolymer of acrylamide with dimethylaminoethylacrylate of 0.6% (mass). Weight loss was 8.4%.

Examples confirm the achievement of the technical result in the case of the combination of features stated in the independent claim.

The dedusting composition for the treatment of dust-forming surfaces containing polyelectrolyte and water, characterized in that it contains aqueous solutions of alkali metal polyacrylate and copolymer of acrylamide derivative of acrylic acid, used copolymers of acrylamide with dimethylaminoethylacrylate, dimethylaminoethylmethacrylate or dimethylaminopropylamine the Ohm, as the concentration of the solution of alkali metal polyacrylate is 0.1 to 1.0 wt.%, as the concentration of the solution of a copolymer of acrylamide derivative of acrylic acid is 0.05-0.5 wt.%.



 

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The invention relates to the mining industry, and in particular to methods of fixing the dust-forming surfaces of the tailings processing plants and other sandy soils

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