Method for preparing thermal and sound insulation material from lead-zinc mine tailings

Abstract

The application discloses a kind of lead-zinc ore tailings preparation heat preservation sound insulation material, raw material includes by weight in parts calculation: lead-zinc ore tailings 60 parts, fly ash 10 parts, modified bentonite 8 parts, water 37 parts and binder 5 parts.Its preparation method includes: after lead-zinc ore tailings, fly ash, modified bentonite are mixed in proportion, conveying to vertical mill for grinding powder;Water is added in the obtained powder, and stirred for 1h at room temperature, to obtain mixed liquor;Binder is added in mixed liquor, and stirred for 4h at room temperature, to obtain mixed slurry;Mixed slurry is subjected to staged heating sintering, and finally heat preservation sound insulation material is obtained.The preparation method step is simple, suitable for large-scale production, provides a new direction for the treatment and utilization of lead-zinc ore tailings;The heat preservation sound insulation material prepared by the above method has the characteristics of fireproof and corrosion-resistant, high durability, sound absorption and noise reduction, fungus resistance and mildew resistance, and is suitable for building field.

Description

Technical Field

[0001] This invention relates to the field of material preparation technology, and in particular to a method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings. Background Technology

[0002] Lead-zinc ore is a major mineral resource in my country, with abundant reserves. However, the mining and processing of lead-zinc ore often results in the formation of large amounts of tailings. Lead-zinc mine tailings are a significant source of heavy metal pollution, and the resulting ecological and environmental problems have gradually become a focus of public attention.

[0003] The main elemental contents of the lead-zinc mine tailings, as analyzed, include: CaF₂ 13.92%, Fe 0.63%, SiO₂ 73.09%, Pb 0.43%, Zn 0.18%, Al₂O 33.74%, Na₂O 0.12%, K₂O 1.09%, BaSO₄ 2.86%, P 0.69%, and Fe₂O 30.17%. Based on the characteristics of lead-zinc mine tailings, researchers have conducted various studies on their resource reuse. For example, Yan Zan et al. explored the comprehensive utilization of lead-zinc tailings in my country from aspects such as re-selection technology, production of building materials, tailings backfilling, and tailings area reclamation. Yi Longsheng et al., based on a review of the advantages and disadvantages of various utilization pathways of lead-zinc tailings, proposed a new approach to prepare non-fired ceramsite from lead-zinc tailings. Ye Lijia, based on the study of tailings process mineralogy, proposed a beneficiation process scheme for the comprehensive recovery of sulfur and iron from tailings. Wang Qinjian et al. introduced the current status of comprehensive utilization of lead-zinc tailings in China from aspects such as re-selection of valuable resources of lead-zinc tailings, application in building materials, and backfilling of mined-out areas. Liu Zhende et al. believed that the tailings stored in the tailings pond of the Fankou lead-zinc mine in Guangdong Province for the recovery of sulfur concentrate and backfilling aggregate have a potential value of over 1 billion yuan. However, the comprehensive utilization of lead-zinc tailings in my country is still at the theoretical or methodological research stage, with actual application rate at only about 18.9%, which is far behind the 60% comprehensive utilization rate abroad. Moreover, the tailings are mainly used for backfilling, mining, and building materials.

[0004] Due to their advantages such as fire resistance, heat insulation, and sound insulation, thermal insulation and soundproofing materials are frequently used in the construction industry. These materials generally include inorganic and organic insulation materials. Inorganic insulation materials include expanded perlite, aerated concrete, glass wool, and rock wool, while organic insulation materials include polystyrene foam and polyurethane foam. If lead-zinc mine tailings could be reused to produce thermal and sound insulation materials for construction, it would not only alleviate the heavy metal pollution problem caused by lead-zinc mine tailings but also allow for resource utilization of these tailings. However, both domestically and internationally, methods for using lead-zinc mine tailings as raw materials to produce thermal and sound insulation materials are virtually nonexistent.

[0005] Therefore, it is necessary to propose a method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings to solve the above problems. Summary of the Invention

[0006] The technical problem to be solved by this invention is to address the resource utilization issue of lead-zinc mine tailings by proposing a method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings.

[0007] One of the objectives of this invention is to provide a thermal insulation and soundproofing material prepared from lead-zinc mine tailings, the raw materials of which include: lead-zinc mine tailings, fly ash, modified bentonite, water and adhesive, with lead-zinc mine tailings accounting for 50% of the total weight of the raw materials.

[0008] Furthermore, the raw materials for thermal insulation and soundproofing materials, calculated by weight in parts, include: 60 parts lead-zinc mine tailings, 10 parts fly ash, 8 parts modified bentonite, 37 parts water, and 5 parts adhesive.

[0009] Bentonite, as a resource-rich natural non-metallic mineral, possesses properties such as swelling, catalytic activity, adsorption, cation exchange, lubrication, suspension, dispersibility, binding, stability, and non-toxicity.

[0010] The preparation method of modified bentonite is as follows:

[0011] Take 100g of calcium-based bentonite, put it in a container, add 100mL of 1mol / L hydrogen peroxide, and stir at room temperature for 1h.

[0012] Then heat to 90 degrees Celsius, add 200 mL of 2 mol / L hydrochloric acid solution, continue stirring for 1 hour, stop heating, and cool to room temperature;

[0013] After rinsing the bentonite with water multiple times, it is dried in the sun or by baking to obtain modified bentonite.

[0014] After bentonite is modified with hydrogen peroxide and hydrochloric acid, it can be added to other raw materials of thermal insulation and sound insulation materials to improve its adsorption with other materials, thereby improving the stability of the thermal insulation and sound insulation materials.

[0015] In this application, the adhesive, acting as a polymerizing agent for thermal insulation and soundproofing materials, plays a role in copolymerizing other materials. This application proposes a novel adhesive formulation and method for the raw materials used in thermal insulation and soundproofing materials.

[0016] The adhesive raw materials, by weight, include: 25 parts palmitic acid glyceride, 7 parts No. 10 industrial white oil, 2 parts dodecyl dimethyl benzyl ammonium chloride, 5 parts sodium dodecylbenzene sulfonate, and 11 parts BYKETOL-OK leveling agent.

[0017] The adhesive is prepared by adding glyceryl palmitate, No. 10 industrial white oil, dodecyl dimethyl benzyl ammonium chloride, sodium dodecylbenzene sulfonate, and BYKETOL-OK leveling agent in sequence, mixing them evenly, and then sealing them.

[0018] The adhesive prepared by the above method can not only play a role in the polymerization of various materials, but also reduce the density of thermal insulation and sound insulation materials.

[0019] The second objective of this invention is to provide a method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings, comprising the following steps:

[0020] Lead-zinc mine tailings, fly ash, and modified bentonite are mixed in a certain proportion and then fed into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0021] Add water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0022] Add binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0023] The mixed slurry is heated and sintered in stages to finally obtain a thermal insulation and sound insulation material.

[0024] The segmented heating method is as follows: room temperature - 700℃, heating rate of 50℃ / min, holding for 30min; 700℃ - 1000℃, heating rate of 30℃ / min, holding for 30min; 1000℃ - 1300℃, heating rate of 30℃ / min, holding for 1h; 1300℃ - 1400℃, heating rate of 10℃ / min, holding for 3h; 1400℃ - room temperature.

[0025] This preparation method is simple and suitable for large-scale production, providing a new direction for the treatment and utilization of lead-zinc mine tailings. The thermal insulation and sound insulation material prepared by the above method has the characteristics of fire resistance, corrosion resistance, high durability, sound absorption and noise reduction, and antibacterial and anti-mildew properties, making it suitable for the construction industry. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the process for preparing thermal insulation and soundproofing materials from tailings of this lead-zinc mine. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides a method for preparing thermal insulation and soundproofing material from lead-zinc mine tailings. The raw materials, calculated by weight in parts, include: 60 parts lead-zinc mine tailings, 10 parts fly ash, 8 parts modified bentonite, 37 parts water, and 5 parts adhesive.

[0030] The modified bentonite in the raw materials is obtained through bentonite modification, and its preparation method is as follows:

[0031] Take 100g of calcium-based bentonite, put it in a container, add 100mL of 1mol / L hydrogen peroxide, and stir at room temperature for 1h; then heat to 90 degrees, add 200mL of 2mol / L hydrochloric acid solution, continue stirring for 1h, stop heating, and cool to room temperature; after rinsing the bentonite with water several times, sun-dry or oven-dry to obtain modified bentonite.

[0032] In the raw materials, the adhesive plays an important role as the polymerizing agent of the thermal insulation and sound insulation material. Based on the characteristics and requirements of other materials, this application proposes a new adhesive formulation and preparation method suitable for this thermal insulation and sound insulation material.

[0033] The adhesive raw materials, by weight, include: 25 parts palmitic acid glyceride, 7 parts No. 10 industrial white oil, 2 parts dodecyl dimethyl benzyl ammonium chloride, 5 parts sodium dodecylbenzene sulfonate, and 11 parts BYKETOL-OK leveling agent.

[0034] The adhesive is prepared by adding glyceryl palmitate, No. 10 industrial white oil, dodecyl dimethyl benzyl ammonium chloride, sodium dodecylbenzene sulfonate, and BYKETOL-OK leveling agent in sequence, mixing them evenly, and then sealing them.

[0035] Please see Figure 1 , Figure 1 A flowchart illustrating the method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings. Based on the above formulation, this invention also provides a method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings, comprising the following steps:

[0036] Lead-zinc mine tailings, fly ash, and modified bentonite are mixed in a certain proportion and then fed into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0037] Add water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0038] Add binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0039] The mixed slurry is heated and sintered in stages to finally obtain a thermal insulation and sound insulation material.

[0040] The segmented heating method is as follows: room temperature - 700℃, heating rate of 50℃ / min, holding for 30min; 700℃ - 1000℃, heating rate of 30℃ / min, holding for 30min; 1000℃ - 1300℃, heating rate of 30℃ / min, holding for 1h; 1300℃ - 1400℃, heating rate of 10℃ / min, holding for 3h; 1400℃ - room temperature.

[0041] The following examples, 1-9, are used to evaluate the performance of this thermal insulation and soundproofing material.

[0042] Example 1

[0043] Mix 60 parts of lead-zinc mine tailings, 10 parts of fly ash, and 8 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0044] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0045] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0046] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃ - 1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃ - 1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃ - 1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃ - room temperature. The final product was thermal insulation and soundproofing material 1.

[0047] Example 2

[0048] Mix 55 parts of lead-zinc mine tailings, 10 parts of fly ash, and 8 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0049] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0050] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0051] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃-1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃-1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃-1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃-room temperature. The final product was thermal insulation and soundproofing material 2.

[0052] Example 3

[0053] Mix 65 parts of lead-zinc mine tailings, 10 parts of fly ash, and 8 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0054] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0055] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0056] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃-1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃-1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃-1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃-room temperature. The final product was thermal insulation and soundproofing material 3.

[0057] Example 4

[0058] Mix 60 parts of lead-zinc mine tailings, 15 parts of fly ash, and 8 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0059] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0060] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0061] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃-1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃-1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃-1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃-room temperature. The final product was thermal insulation and soundproofing material 4.

[0062] Example 5

[0063] Mix 60 parts of lead-zinc mine tailings, 5 parts of fly ash, and 8 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0064] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0065] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0066] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃ - 1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃ - 1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃ - 1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃ - room temperature. The final product was thermal insulation and soundproofing material 5.

[0067] Example 6

[0068] Mix 60 parts of lead-zinc mine tailings, 10 parts of fly ash, and 6 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0069] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0070] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0071] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃ - 1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃ - 1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃ - 1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃ - room temperature. The final product was thermal insulation and soundproofing material 6.

[0072] Example 7

[0073] Mix 60 parts of lead-zinc mine tailings, 10 parts of fly ash, and 10 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0074] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0075] Add 5 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0076] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃-1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃-1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃-1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃-room temperature. The final product was thermal insulation and soundproofing material 7.

[0077] Example 8

[0078] Mix 60 parts of lead-zinc mine tailings, 10 parts of fly ash, and 6 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0079] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0080] Add 3 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0081] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃-1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃-1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃-1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃-room temperature. The final product was thermal insulation and soundproofing material 8.

[0082] Example 9

[0083] Mix 60 parts of lead-zinc mine tailings, 10 parts of fly ash, and 6 parts of modified bentonite in a certain proportion, and then feed them into a vertical grinding mill for grinding. The grinding particle size is no more than 300 mesh.

[0084] Add 37 parts of water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid.

[0085] Add 7 parts of binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry;

[0086] The mixed slurry was subjected to segmented heating and sintering: room temperature - 700℃, heating rate 50℃ / min, holding for 30 min; 700℃ - 1000℃, heating rate 30℃ / min, holding for 30 min; 1000℃ - 1300℃, heating rate 30℃ / min, holding for 1 h; 1300℃ - 1400℃, heating rate 10℃ / min, holding for 3 h; 1400℃ - room temperature. The final product was thermal insulation and soundproofing material 9.

[0087] The thermal insulation and sound insulation materials 1-9 prepared in Examples 1-9 above were subjected to performance tests. The specific test results are shown in Table 1.

[0088] Table 1 Performance test results of thermal insulation and soundproofing materials 1-9

[0089]

[0090] The data in the table show that the various thermal insulation and sound insulation materials prepared by this method have good performance in terms of compressive strength and thermal conductivity. Considering all factors, the formula in Comparative Example 1 is the optimal formula.

[0091] The thermal insulation and sound insulation material prepared by this formula and method has a low thermal conductivity, good thermal insulation effect, and high temperature resistance. Moreover, it utilizes lead-zinc mine tailings waste, which not only creates value but also purifies the environment, thus having great social and economic benefits.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings, characterized in that, The raw materials of the thermal insulation and sound insulation material, calculated by weight in parts, include: 60 parts lead-zinc mine tailings, 10 parts fly ash, 8 parts modified bentonite, 37 parts water, and 5 parts adhesive. The method for preparing the modified bentonite is as follows: S1. Take 100g of calcium-based bentonite, put it in a container, add 100mL of 1mol / L hydrogen peroxide, and stir at room temperature for 1h. S2. Then heat to 90 degrees Celsius, add 200 mL of 2 mol / L hydrochloric acid solution, continue stirring for 1 hour, stop heating, and cool to room temperature; S3. After rinsing the bentonite with water several times, dry it in the sun or oven to obtain modified bentonite. The raw materials of the adhesive, calculated by weight in parts, include: 25 parts palmitic acid glyceride, 7 parts No. 10 industrial white oil, 2 parts dodecyl dimethyl benzyl ammonium chloride, 5 parts sodium dodecylbenzene sulfonate, and 11 parts BYKETOL-OK leveling agent.

2. The method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings according to claim 1, characterized in that, The adhesive is prepared by sequentially adding palmitic acid glyceride, No. 10 industrial white oil, dodecyl dimethyl benzyl ammonium chloride, sodium dodecylbenzene sulfonate, and BYKETOL-OK leveling agent, mixing them evenly, and then sealing them.

3. The method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings according to claim 1, characterized in that, Includes the following steps: S1. The lead-zinc mine tailings, fly ash, and modified bentonite are mixed in proportion and then fed into a vertical grinding mill for grinding. S2. Add water to the obtained powder and stir at room temperature for 1 hour to obtain a mixed liquid; S3. Add binder to the mixture and stir at room temperature for 4 hours to obtain the mixture slurry. S4. The mixed slurry is heated and sintered in stages to finally obtain thermal insulation and sound insulation material.

4. The method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings according to claim 3, characterized in that, In step S1, the grinding particle size is no greater than 300 mesh.

5. The method for preparing thermal insulation and soundproofing materials from lead-zinc mine tailings according to claim 4, characterized in that, The segmented heating method in S4 is as follows: room temperature - 700℃, heating rate of 50℃ / min, holding for 30min; 700℃ - 1000℃, heating rate of 30℃ / min, holding for 30min; 1000℃ - 1300℃, heating rate of 30℃ / min, holding for 1h; 1300℃ - 1400℃, heating rate of 10℃ / min, holding for 3h; 1400℃ - room temperature.

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