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CN-121988114-A - High-stability dust suppression foam based on ion in-situ shielding effect and construction process thereof

CN121988114ACN 121988114 ACN121988114 ACN 121988114ACN-121988114-A

Abstract

The application relates to the technical field of mine safety and dust control, and discloses a high-stability dust suppression foam based on ion in-situ shielding effect and a construction process thereof, wherein the foam is prepared from a film forming auxiliary agent, a surfactant, an ion shielding agent and a hard water solvent, the application utilizes the ion shielding agent to adsorb calcium and magnesium ions in situ in the hard water solvent, the method comprises the steps of preparing a film forming additive solution, compounding a basic foaming liquid, adding an ion shielding agent, performing continuous suspension treatment and interface reconstruction, and finally performing physical foaming. The application effectively solves the problems of poor foam stability and low dust suppression efficiency caused by high-hardness water quality of mines, and the obtained foam has low surface tension, long liquid discharge half-life and high wetting speed on coal dust, and is suitable for high-mineralization water quality environments of mines.

Inventors

  • GAN JIAN
  • WANG WANRU
  • Ren tenglong

Assignees

  • 安徽理工大学

Dates

Publication Date
20260508
Application Date
20260302

Claims (10)

  1. 1. The high-stability dust suppression foam based on the ion in-situ shielding effect is characterized by being prepared from the following raw materials in parts by weight: 2.0-4.0 parts of film forming auxiliary agent; 0.05-0.1 part of surfactant; 2.0-6.0 parts of ion shielding agent; 100 parts of solvent; Wherein the solvent is hard water containing calcium ions and magnesium ions, and the ion shielding agent is dispersed in the solvent.
  2. 2. The high-stability dust suppression foam based on the ion in-situ shielding effect of claim 1, wherein the ion shielding agent is a spherical NaY molecular sieve, the surfactant is dodecyl dimethyl betaine, and the film forming auxiliary agent is polyvinyl alcohol.
  3. 3. The high-stability dust suppression foam based on the ion in-situ shielding effect according to claim 1, wherein the mineralization degree of the solvent is such that the total hardness of calcium ions and magnesium ions is 300mg/L or more.
  4. 4. The high-stability dust suppression foam based on the ion in-situ shielding effect according to claim 1, wherein the balance surface tension of foaming stock solution of the dust suppression foam is 29-31 mN/m.
  5. 5. A build process for preparing the ion in situ shielding effect-based high stability dust suppression foam of any one of claims 1-4, comprising the steps of: Adding the film forming auxiliary agent into the solvent, stirring under heating until the film forming auxiliary agent is dissolved, and then cooling to room temperature to prepare a film forming auxiliary agent solution; adding the surfactant into the film forming auxiliary agent solution, and uniformly mixing to obtain a basic foaming liquid; Adding the ion shielding agent into the basic foaming liquid, starting mechanical stirring to enable the ion shielding agent to be in a suspension state, and continuously treating for a period of time to perform ion in-situ shielding and interface reconstruction to obtain solid-liquid mixed slurry; and (3) introducing gas into the solid-liquid mixed slurry to perform physical foaming, thus obtaining the high-stability dust suppression foam.
  6. 6. The construction process of the high-stability dust suppression foam based on the ion in-situ shielding effect of claim 5, wherein the temperature of the heating condition is 85-95 ℃.
  7. 7. The construction process of the high-stability dust suppression foam based on the ion in-situ shielding effect, which is characterized by being cooled to 20-30 ℃ when the temperature is cooled to room temperature.
  8. 8. The construction process of the high-stability dust suppression foam based on the ion in-situ shielding effect of claim 5, wherein the duration of the continuous treatment is controlled to be 6-10 min.
  9. 9. The construction process of the high-stability dust suppression foam based on the ion in-situ shielding effect, which is disclosed in claim 5, is characterized in that the end point judgment basis of the ion in-situ shielding and interface reconstruction is that the total removal rate of calcium ions and magnesium ions in a system reaches more than 50%, and the surface tension of the system is reduced to 29 mN/m-31 mN/m.
  10. 10. The construction process of the high-stability dust suppression foam based on the ion in-situ shielding effect, which is characterized in that the physical foaming is realized by dispersing the gas into the solid-liquid mixed slurry through a filter plate with the pore diameter of 40-60 μm.

Description

High-stability dust suppression foam based on ion in-situ shielding effect and construction process thereof Technical Field The invention relates to the technical field of mine safety and dust control, in particular to high-stability dust suppression foam based on an ion in-situ shielding effect and a construction process thereof. Background The coal mining, transportation and washing process can generate a large amount of dust, so that the underground operation environment is deteriorated, the visibility is reduced, the long-term inhalation can also cause serious threat to the occupational health of operators, the foam dust suppression technology captures and settles the dust by utilizing the large specific surface area, good adhesiveness and wettability of foam fluid, and compared with the traditional spray sprinkling dust suppression technology, the foam dust suppression technology has the advantages of small water consumption, wide coverage range and high dust suppression efficiency, and becomes an important technical means for preventing and controlling the dust of the current mine. However, the underground operation environment of the mine is special, the clean tap water supply is usually lacking, the dust suppression water is mostly directly taken from underground mine water, the mine water is influenced by geological conditions, the mine water is generally characterized by high mineralization degree, the mine water contains high-concentration divalent metal cations such as calcium ions and magnesium ions, and the mine water belongs to typical high-hardness water quality, the high-hardness water environment forms a serious challenge for the preparation and performance maintenance of dust suppression foam, excessive calcium ions and magnesium ions in the water body can be subjected to complexation reaction with anionic surfactants to generate insoluble precipitates, or electric double layers of compressed surfactant molecules at gas-liquid interfaces weaken electrostatic repulsive force among molecules, so that the surfactant is desorbed or aggregated from the interfaces, the foaming capacity of the foaming agent is reduced, in addition, the high-ion strength accelerates the gravity drainage speed of the foam liquid film, so that the liquid film is rapidly thinned and broken, the stable existence time of the foam is seriously shortened, and the dust suppression agent cannot effectively cover dust sources. The existing dust suppression foaming agent formula is mostly developed based on low-hardness water quality environment, when the existing dust suppression foaming agent formula is directly applied to high-hardness mine water, the problems of suddenly reduced foaming multiple, short half-life of foam, poor wetting and capturing capability on coal dust and the like often occur, although the water quality can be improved by installing physical softening water equipment in the pit or adding a large amount of chemical chelating agents in advance, the physical treatment equipment is huge in volume and complex in maintenance and is difficult to adapt to the narrow and changeable working space in the pit, and the use of the conventional chemical chelating agents not only increases the cost, but also has limited foam stabilizing effect under the high-hardness condition. Therefore, the development of the dust suppression foam which can be directly suitable for high-hardness water quality and realize high stability by utilizing an in-situ shielding mechanism on the premise of no need of complex pretreatment equipment is a technical problem to be solved urgently in the field of mine dust control at present. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the high-stability dust suppression foam based on the ion in-situ shielding effect and the construction process thereof, and solves the problems that the foaming capacity and the foam stability are obviously reduced due to the damage of high-concentration calcium and magnesium ions when the existing mine foam dust suppression technology directly utilizes high-hardness underground water, and the conventional water quality pretreatment means are limited by the underground operation environment and the cost and are difficult to effectively apply. The high-stability dust suppression foam is prepared from the following raw materials, by weight, 2.0 to 4.0 parts of film forming auxiliary agents, 0.05 to 0.1 part of surfactants, 2.0 to 6.0 parts of ion shielding agents and 100 parts of solvents, wherein the solvents are hard water containing calcium ions and magnesium ions, the ion shielding agents are dispersed in the solvents and are used for adsorbing the calcium ions and the magnesium ions in situ to reduce the ionic strength of a system, and the ion shielding agents, the film forming auxiliary agents and the surfactants cooperate to form a stable bubble interfacial film structure. By adopting the technical scheme, the invent