Paste emulsion matrix for upward hole blasting, paste emulsion explosive and method thereof

Abstract

The invention discloses a paste emulsion matrix for upward hole blasting, a paste emulsion explosive and a method of the paste emulsion matrix and the paste emulsion explosive, and relates to the technical field of industrial explosives, a water-in-oil type paste emulsion matrix is prepared by mixing a specially-made oil phase solution and a specially-made water phase solution in an emulsifier. When an upward blast hole is filled with the paste emulsion matrix by a charging truck on an underground construction site, and the matrix and a specially-made lubricant are conveyed to a conveying pipe orifice by a conveying pipeline together, the paste emulsion matrix and the lubricant are mixed uniformly by a static mixer, so that the paste emulsion matrix is formed. At the moment, the pasty emulsion matrix and active substances in the lubricant are subjected to partial cross-linking reaction to form a thicker pasty emulsion explosive which is attached to the inner wall of the blast hole. The method has the advantages that hole returning is avoided, cost is saved, and the blasting effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of industrial explosives, in particular to a paste emulsion matrix for upward hole blasting, a paste emulsion explosive and a method thereof. Background Art

[0002] At present, there are many methods used for underground mining in China, among which the upward hole blasting method is the most efficient and the lowest cost mining method. This method is to drill holes upward in the tunnel, use a special charging vehicle to charge upwards, and blast, which can mine more ore and is easy to mine. However, there are also certain defects: the charge is easy to fall, resulting in a waste of explosives and seriously affecting the blasting effect. Summary of the invention

[0003] In view of the defects existing in the prior art, the purpose of the present invention is to provide a paste emulsion matrix, a paste emulsion explosive and a method thereof for upward hole blasting. The paste emulsion matrix is ​​sensitized and cross-linked during the underground charging process to form a viscous emulsion explosive, which has the advantages of no back-hole (dropping of emulsion explosive), cost saving and good blasting effect.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a method for preparing a paste emulsified matrix for upward hole blasting, comprising the following steps:

[0005] Step S101. Prepare the aqueous phase by taking 82-84% ammonium nitrate, 1-3% sodium nitrate, 0.15-0.25% thiourea and the balance water by mass percentage, stir and mix evenly, heat to 90-95°C, adjust the pH value of the aqueous phase to 3.0-3.5 with citric acid, and set aside;

[0006] Step S102. Prepare the oil phase by taking 18-22% of Span emulsifier, 9-11% of polymer emulsifier, 4-6% of higher fatty acid alkali metal salt, and the balance of No. 10 engine oil, mix and stir evenly, and heat to 85-90°C for standby use;

[0007] Step S103: 93.5-94.0% of the water phase and 6.0-6.5% of the oil phase are taken by mass percentage and mixed by an emulsifier to obtain a paste emulsified base.

[0008] On the basis of the above technical solution, the higher fatty acid alkali metal salt is potassium stearate.

[0009] The invention also discloses a paste emulsified matrix prepared by the method.

[0010] The present invention also discloses a method for preparing and using a paste emulsion explosive, comprising the following steps:

[0011] Step S201. Lubricant preparation: 3-5% sodium nitrite, 2.5-3.5% polyvalent metal nitrate, and the balance water are mixed and stirred evenly for use;

[0012] Step S202. The lubricant and the above-mentioned paste emulsion matrix are sent to the delivery pipe mouth by a delivery pipe in a mass ratio of 2.0-4.0%:96-98% through a charging vehicle used at the underground construction site. The paste emulsion matrix and the lubricant are mixed evenly through a static mixer to form a paste emulsion explosive, which is attached to the inner wall of the blast hole.

[0013] Based on the above technical solution, the multivalent metal nitrate is calcium nitrate or aluminum nitrate.

[0014] The invention also discloses a paste-like emulsion explosive prepared by the method.

[0015] Based on the above technical solution, the viscosity of the paste emulsion explosive is 102.1-113.8 mPa.S.

[0016] The beneficial effects of the present invention are:

[0017] The present invention uses a paste emulsified matrix, and in the process of underground charging, the paste emulsified matrix is ​​mixed with a lubricant, sensitized and cross-linked to form a viscous emulsion explosive, which has the advantages of no back-hole (dropping of emulsion explosive), cost saving and good blasting effect. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the examples, which are explanations of the present invention and are not limited to the following examples. The present invention limits the amount of addition to facilitate the implementation of the present invention, and does not mean that it cannot be implemented outside the scope of the present invention.

[0019] The present invention provides a method for preparing a paste-like emulsified matrix for upward hole blasting, comprising the following steps:

[0020] Step S101. Prepare the aqueous phase by taking 82-84% ammonium nitrate, 1-3% sodium nitrate, 0.15-0.25% thiourea and the balance water by mass percentage, stir and mix evenly, heat to 90-95°C, adjust the pH value of the aqueous phase to 3.0-3.5 with citric acid, and set aside;

[0021] Step S102. Prepare the oil phase by taking 18-22% of Span emulsifier, 9-11% of polymer emulsifier, 4-6% of higher fatty acid alkali metal salt, and the balance No. 10 engine oil by mass percentage, mix and stir evenly, and heat to 85-90°C for standby use; specifically, the higher fatty acid alkali metal salt is potassium stearate.

[0022] Step S103: 93.5-94.0% of the water phase and 6.0-6.5% of the oil phase are taken by mass percentage and mixed by an emulsifier to obtain a paste emulsified base.

[0023] The invention also provides a creamy emulsified matrix prepared by the method.

[0024] The present invention also provides a method for preparing and using a paste emulsion explosive, comprising the following steps:

[0025] Step S201. Lubricant preparation: 3-5% sodium nitrite, 2.5-3.5% polyvalent metal nitrate, and the balance water are mixed and stirred evenly for use; specifically, the polyvalent metal nitrate is calcium nitrate or aluminum nitrate.

[0026] Step S202. The lubricant and the above-mentioned paste emulsion matrix are sent to the delivery pipe mouth by a delivery pipe in a mass ratio of 2.0-4.0%:96-98% through a charging vehicle used at the underground construction site. The paste emulsion matrix and the lubricant are mixed evenly through a static mixer to form a paste emulsion explosive, which is attached to the inner wall of the blast hole.

[0027] The present invention also provides a paste emulsion explosive prepared by the above method. Specifically, the viscosity of the paste emulsion explosive is 102.1-113.8 mPa.S.

[0028] The present invention is further described below through several specific embodiments.

[0029] Embodiment 1:

[0030] 1. Preparation of water phase: ammonium nitrate: 82%; sodium nitrate: 3%; thiourea: 0.15%; water: balance. Heat the above mixture to 90°C and adjust the pH value of the water phase to 3.0 with citric acid. Set aside.

[0031] 2. Oil phase preparation: Span emulsifier: 22%; polymer emulsifier: 9%; No. 10 engine oil: 63%; potassium stearate: 6%; heat the above mixture to 85°C and set aside.

[0032] 3. Lubricant preparation: Sodium nitrite: 5%; Calcium nitrate: 2.5%; Water: the balance. Add water to the above mixture and stir evenly. Set aside.

[0033] 4. Mix the above water phase and oil phase in an emulsifier according to the ratio of water phase: 93.5%; oil phase: 6.5% to obtain a paste emulsified base.

[0034] 5. The lubricant and the paste emulsified base are sent to the delivery pipe port by a special charging vehicle at a ratio of 4.0%:96.0% at the underground construction site. Then, the lubricant and the base are mixed by a static mixer. The paste emulsified base and the lubricant are evenly mixed. At this time, the paste emulsified base and the active substances in the lubricant undergo a partial cross-linking reaction, forming a more viscous paste emulsion explosive, which is attached to the inner wall of the blast hole.

[0035] The test return rate and viscosity are shown in Table 1:

[0036] Table 1: Drug return rate and viscosity

[0037]

[0038] Embodiment 2:

[0039] 1. Preparation of water phase: ammonium nitrate: 84%; sodium nitrate: 3%; thiourea: 0.25%; water: the balance. Heat the above mixture to 95°C and adjust the pH value of the water phase to 3.5 with citric acid. Set aside.

[0040] 2. Oil phase preparation: Span emulsifier: 20%; polymer emulsifier: 11%; No. 10 engine oil: 65%; potassium stearate: 4%; heat the above mixture to 85°C and set aside.

[0041] 3. Lubricant preparation: Sodium nitrite: 3%; Aluminum nitrate: 3.5%; Water: the balance. Add water to the above mixture and stir evenly. Set aside.

[0042] 4. The above water phase and oil phase are mixed in an emulsifier according to the ratio of water phase: 94.0%; oil phase: 6.0%. The water phase and oil phase are mixed in an emulsifier to obtain a paste emulsified base.

[0043] 5. The lubricant and the paste emulsified base are sent to the delivery pipe port by a special charging vehicle at a ratio of 2.0%:98.0% through a delivery pipe at an underground construction site. The paste emulsified base and the lubricant are mixed evenly through a static mixer. At this time, the paste emulsified base and the active substances in the lubricant undergo a partial cross-linking reaction to form a more viscous paste emulsion explosive, which is attached to the inner wall of the blast hole.

[0044] The test return rate and viscosity are shown in Table 2:

[0045] Table 2: Drug return rate and viscosity

[0046]

[0047] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A method for preparing a paste emulsified matrix for upward hole blasting, characterized in that: The following steps are involved: Step S101. Prepare the aqueous phase by taking 82-84% ammonium nitrate, 1-3% sodium nitrate, 0.15-0.25% thiourea and the balance water by mass percentage, stir and mix evenly, heat to 90-95°C, adjust the pH value of the aqueous phase to 3.0-3.5 with citric acid, and set aside; Step S102. Prepare the oil phase by taking 18-22% of Span emulsifier, 9-11% of polymer emulsifier, 4-6% of higher fatty acid alkali metal salt, and the balance of No. 10 engine oil, mix and stir evenly, and heat to 85-90°C for standby use; Step S103: 93.5-94.0% of the water phase and 6.0-6.5% of the oil phase are taken by mass percentage and mixed by an emulsifier to obtain a paste emulsified base.

2. The method for preparing the paste-like emulsified matrix for upward hole blasting according to claim 1, characterized in that: The higher fatty acid alkali metal salt is potassium stearate.

3. A creamy emulsified base prepared by the method according to any one of claims 1 to 2.

4. A method for preparing and using a paste emulsion explosive, characterized in that: The following steps are involved: Step S201. Lubricant preparation: 3-5% sodium nitrite, 2.5-3.5% polyvalent metal nitrate, and the balance water are mixed and stirred evenly for use; Step S202. The lubricant and the paste emulsion matrix according to claim 3 are sent to the delivery pipe mouth by a delivery pipe in a mass ratio of 2.0-4.0%:96-98% through a charging vehicle used at the underground construction site. The paste emulsion matrix and the lubricant are mixed evenly through a static mixer to form a paste emulsion explosive, which is attached to the inner wall of the blast hole.

5. The method for preparing the paste-like emulsified base for upward hole blasting according to claim 4, characterized in that: The multivalent metal nitrate is calcium nitrate or aluminum nitrate.

6. A paste emulsion explosive prepared by the method according to any one of claims 4 to 5.

7. The paste emulsion explosive according to claim 6, characterized in that: The viscosity of the paste emulsion explosive is 102.1-113.8 mPa.S.

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