A melting homogenization method of high-waste-glass-doped lightweight bottle cans

Abstract

The application discloses a kind of high waste glass content lightweight bottle and can melting homogenization method, it is applicable to waste glass content 30wt%~50wt% sodium calcium silicon glass bottle and can batch material system.The method comprises: waste glass pretreatment;Grading step feeding;Four-stage gradient temperature melting;Platinum rhodium alloy stirring paddle mechanical stirring;Residual heat step utilization and on-line monitoring and feedback control;Cooling to forming temperature.The application reduces the number of finished glass liquid gas bubbles to 3 below / kg, refractive index mean square deviation ≤0.0003, compared with traditional process, the comprehensive energy consumption is reduced by 10%~15%, effectively solve the technical problems of bubble defect and stripe defect coexistence under high waste glass content.

Description

Technical Field

[0001] This invention relates to the field of glass melting technology, specifically to a melting and homogenization method for lightweight bottles and jars with high waste glass content. Background Technology

[0002] Lightweight glass bottles and jars represent the mainstream development direction in the glass container industry. Increasing the amount of waste glass can reduce melting temperature and raw material costs, resulting in significant energy-saving and emission-reduction benefits. However, when the amount of waste glass exceeds 30 wt%, existing processes generally face three technical bottlenecks:

[0003] First, it exacerbates bubble defects. Organic pollutants and trace amounts of carbonates adhering to the surface of waste glass decompose at high temperatures, generating a large amount of gas. When the amount added is too high, the gas source increases sharply, leading to excessive bubbles in the finished glass melt.

[0004] Second, streak defects are prominent. There are differences in chemical composition and softening point between waste glass and new batch materials. If they are not mixed sufficiently, streak (rope) defects that are visible to the naked eye will be formed after molding, which is particularly noticeable in lightweight thin-walled bottles and jars.

[0005] Third, energy conservation and quality are mutually restrictive. To overcome the above-mentioned defects, traditional processes usually increase the melting temperature (above 1500℃) and extend the holding time, which significantly increases energy consumption and contradicts the energy conservation goal.

[0006] Existing technologies lack systematic solutions to the above three problems, and there is no overall process method that can simultaneously achieve defect control and energy saving and consumption reduction under the condition of high waste glass content of 30wt% to 50wt%. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned defects of the prior art and provide a melting and homogenization method for lightweight bottles and cans with high waste glass content, so as to achieve the synergistic elimination of bubble defects and stripe defects under the condition of waste glass content of 30wt% to 50wt%, and reduce the overall energy consumption by 10% to 15%.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A melting and homogenization method for lightweight bottles and cans with high waste glass content includes a waste glass pretreatment step, a graded and stepwise feeding step, a gradient temperature melting step, a stirring and homogenization step, and a cooling and forming step.

[0009] In the waste glass pretreatment step, the waste glass is crushed and screened into two grades: coarse-grained (8mm-15mm) and fine-grained (2mm-8mm), with the coarse-grained grade accounting for 60wt%-70wt% of the total mass of the waste glass. Magnetic separation is used to remove iron, ensuring the residual iron content does not exceed 50mg / kg. Water washing and drying are then performed to ensure the moisture content of the waste glass does not exceed 0.3wt%.

[0010] In the graded and step-by-step feeding process, the materials are fed in a three-layer structure: fine-grained waste glass as the bottom layer, the middle layer of the batch material, and a top layer of coarse and fine mixed waste glass. First, 10wt% to 15wt% of fine-grained waste glass (30mm to 50mm thick) is added as the bottom layer. Second, 50wt% to 60wt% of the batch material is added. Finally, the remaining waste glass (coarse-to-fine ratio 1.5 to 2.5:1) is placed on the surface of the batch material. The fine-grained waste glass at the bottom softens first to form an initial liquid phase, guiding the gas in the batch material to escape upwards. The top waste glass covering layer inhibits the batch material from flying and allows the waste glass and the batch material to gradually penetrate and melt from the outside to the inside, improving the interfacial compatibility between the two and reducing the generation of bubbles and streaks from the source.

[0011] In the gradient temperature melting process, a four-stage temperature regime is designed: a preheating stage (heating to 550℃~620℃, holding for 20min~30min), a softening and melting stage (heating to 950℃~1020℃, holding for 30min~45min), a main melting stage (heating to 1430℃~1480℃, holding for 2.0h~3.5h), and a clarification and homogenization stage (1450℃~1500℃, holding for 1.5h~2.5h). The peak main melting temperature is controlled below 1480℃, which is 20℃~70℃ lower than the traditional process. Combined with precise staged preheating treatment, the overall energy consumption can be reduced by 10%~15%.

[0012] In the stirring and homogenization step, the platinum-rhodium alloy stirring paddle (rotation speed 40 r / min to 80 r / min, immersion depth 60% to 75%, duration 30 min to 60 min) and the bottom nitrogen bubbling (pressure 0.15 MPa to 0.25 MPa, flow rate 2.0 L / min to 4.0 L / min) work together: mechanical stirring breaks up the uneven regions in the glass melt to eliminate streaks, and the rising nitrogen gas flow carries residual bubbles to the liquid surface to escape and eliminate bubbles. The synergistic effect of the two is better than any single treatment method.

[0013] In the waste heat cascade utilization step (claim 8), the sensible heat of the flue gas is recovered through the waste heat exchanger of the melting furnace flue, and used for hot air heating of waste glass drying (80℃~120℃) and preheating treatment of batch materials (50℃~80℃), respectively. The waste heat recovery efficiency is not less than 60%, further reducing gas consumption.

[0014] In the online monitoring and feedback control step (claim 9), the online refractive index sensor and the thermal imaging temperature field detection system collect glass melt uniformity data in real time. When the refractive index root mean square error exceeds 0.0004, the stirring and bubbling parameters are automatically adjusted to achieve closed-loop quality control.

[0015] The beneficial effects of this invention are as follows: (1) Effectively eliminate bubble defects: By combining graded feeding design with nitrogen bubbling process, the number of bubbles in the finished glass melt is reduced to less than 3 per kg; (2) Effective elimination of stripe defects: Through the combined effect of gradient temperature regime and mechanical stirring, the root mean square error of refractive index is no greater than 0.0003; (3) Significantly reduce energy consumption: The main melting peak temperature is reduced by 20℃~70℃, and combined with the cascade utilization of waste heat, the overall energy consumption is reduced by 10%~15%; (4) Online closed-loop control: Online monitoring and feedback control steps ensure process stability and reduce scrap rate caused by operating condition fluctuations; (5) Wide range of applications: It is compatible with a wide range of batch systems with waste glass content of 30wt% to 50wt%, and has strong engineering applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the process flow for the melting and homogenization method of lightweight bottles and cans with high waste glass content according to the present invention. Figure 2 This is a schematic diagram of the batch material layer structure of the graded and step-by-step feeding method of the present invention; Figure 3 This is a schematic diagram of the gradient temperature melting process curve of the present invention; Figure 4 This is a schematic diagram showing the arrangement of the stirring paddle and bubbling tube in the refining zone of the melting furnace. Figure 5 This is a schematic diagram of a waste heat cascade utilization system; 1 is the bottom layer of fine-grained waste glass, 2 is the middle layer of batch material, 3 is the top layer of coarse and fine mixed waste glass, 4 is the platinum-rhodium alloy stirring paddle, 5 is the bottom nitrogen bubbling tube, 6 is the flue waste heat exchanger, 7 is the waste glass drying hot air pipeline, and 8 is the batch material preheating pipeline. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] Example 1 (a) Waste glass pretreatment Brown waste beer bottles were collected, washed, crushed by a jaw crusher, and then screened by a vibrating screen into coarse particles (8mm-15mm, 65wt%) and fine particles (2mm-8mm, 35wt%). After magnetic separation to remove iron, the residual iron content was 32mg / kg, and the moisture content after hot air drying at 80℃ was 0.21wt%. The chemical composition of the waste glass was: SiO2 71.2wt%, Na2O 12.8wt%, CaO 10.3wt%, MgO 2.1wt%, Al2O3 1.8wt%, Fe2O3 0.04wt%, meeting the formulation requirements.

[0019] (II) Preparation of batch materials Weigh the raw materials as follows: 62wt% quartz sand, 20wt% soda ash, 7wt% limestone, 5wt% dolomite, and 3wt% feldspar. Add water to adjust the moisture content to 4.0wt% and mix thoroughly. Clarifying agents: 0.4wt% sodium sulfate and 0.15wt% antimony oxide (both based on the total amount of the batch). The batch comprises 55.0wt% of the total batch, with 30wt% waste glass added. The standard deviation of the refractive index is 0.00047, meeting the requirement of ≤0.0005.

[0020] (III) Grading and Step-by-Step Feeding Step 1: Add 12 wt% of fine-grained waste glass (particle size 2mm-8mm) to the batch, laying a base layer about 40mm thick; Step 2: Add the batch material (55 wt% of the batch); Step 3: Cover the surface of the batch material layer with the remaining waste glass (18 wt% of the batch, coarse-to-fine ratio 2:1).

[0021] (iv) Gradient temperature melting Preheating stage: The temperature is increased to 580℃ at a rate of 10℃ / min and held for 25 minutes to allow moisture and decomposition gases from organic pollutants in the batch to escape fully. Softening and melting stage: The temperature is increased to 980℃ at a rate of 6℃ / min and held for 40 minutes. Fine-grained waste glass at the bottom begins to soften at approximately 750℃, forming a continuous initial liquid phase at 980℃, effectively guiding gases in the batch to escape upwards. Main melting stage: The temperature is increased to 1450℃ at a rate of 4℃ / min and held for 2.5 hours; full oxygen combustion is used with an oxygen-fuel ratio of 1.07:1; the furnace feed temperature is 1390℃, and the discharge temperature is 1465℃, with a temperature gradient of 75℃. Clarification and homogenization stage: 1470℃ is maintained for 2.0 hours. The flue gas waste heat recovery system is activated, recovering heat for waste glass drying (hot air temperature 95℃) and batch preheating (to 65℃), with a waste heat recovery efficiency of 62%.

[0022] (v) Stirring and homogenization The platinum-rhodium alloy agitator rotated at 60 r / min, with an immersion depth of 68% for 45 minutes. Simultaneous bottom nitrogen bubbling was implemented: pressure 0.20 MPa, flow rate 3.0 L / min, nitrogen purity 99.95 vol%. The mean square deviation of the online refractive index sensor reading was 0.00038, indicating no triggering of enhanced control commands and normal process operation.

[0023] (vi) Quality inspection and cooling molding Sampling and testing: 1.8 bubbles / kg (pass standard ≤3 bubbles / kg), refractive index standard deviation 0.00021 (≤0.0003), maximum diameter of residual broken glass particles 0.06mm (≤0.1mm), outflow deviation ±1.3% (≤±2%), all indicators are qualified. Cooled to 1200℃ at 3℃ / min, pressure blown into shape using an IS machine, 330mL brown beer bottles are produced. Finished product testing: wall thickness deviation ±0.12mm, vertical load 8200N, thermal shock resistance 45℃, internal stress 10nm / mm, 1.5 bubbles / bottle, refractive index standard deviation 0.00018, lightweight coefficient 0.63. Compared with conventional processes (waste glass content 20wt%, melting temperature 1510℃, no waste heat recovery), overall energy consumption is reduced by 12.0%.

[0024] Example 1 (a) Waste glass pretreatment Colorless waste liquor bottles and brown waste beer bottles were mixed at a colorless:brown mass ratio of 65:35. The coarse particle size was 63wt%, and the fine particle size was 37wt%; the residual iron content after iron removal was 41mg / kg; the moisture content was 0.27wt%; and the chemical composition met the formulation requirements.

[0025] (II) Preparation of batch materials The composition consists of 60 wt% quartz sand, 21 wt% soda ash, 7.5 wt% limestone, 5.5 wt% dolomite, and 4 wt% feldspar, with a moisture content of 3.5 wt%. Clarifying agents include 0.35 wt% sodium sulfate and 0.12 wt% antimony oxide. The batch material comprises 51 wt% of the total batch, with 45 wt% waste glass added.

[0026] (III) Grading and Step-by-Step Feeding Fine-grained waste glass as a base (13 wt% of the total batch, 45 mm thick) → batching material (51 wt% of the total batch) → remaining mixed waste glass as a cover (32 wt% of the total batch, coarse-to-fine ratio 2:1).

[0027] (iv) Gradient temperature melting Preheating: 9℃ / min to 600℃, hold for 28 min; softening and melting: 7℃ / min to 1000℃, hold for 35 min; main melting: 3.5℃ / min to 1465℃, hold for 3.0 h; full oxygen combustion, oxygen-fuel ratio 1.08:1; feeding end 1405℃, discharge end 1480℃; clarification and homogenization: 1480℃, hold for 2.2 h; simultaneously, electric fluxing is activated, electrode power density 0.8kW / m², strengthening bottom convection of the molten glass to eliminate temperature unevenness. The waste heat exchanger hot air temperature is 105℃, the batch preheats to 70℃, and the waste heat recovery efficiency is 65%.

[0028] (v) Stirring and homogenization The agitator speed was 70 r / min, the immersion depth was 72%, and the duration was 55 min. Nitrogen bubbling: pressure 0.22 MPa, flow rate 3.5 L / min. The online refractive index standard deviation was 0.00041, which automatically triggered enhanced regulation. The speed was increased by 15 r / min to 85 r / min, and the bubbling flow rate was increased by 0.8 L / min to 4.3 L / min. After 10 min, the refractive index standard deviation decreased to 0.00027, returning to normal parameters.

[0029] (vi) Quality inspection and cooling molding Sampling and testing: 2.1 bubbles / kg, refractive index standard deviation 0.00025, maximum residual particle size 0.08mm, outflow deviation ±1.7%, all items passed. Cooled to 1185℃ at 2.5℃ / min, blow-blown to produce 500mL colorless lightweight liquor bottles. Finished product testing: wall thickness deviation ±0.14mm, vertical load 8500N, thermal shock resistance 47℃, internal stress 11nm / mm, 1.8 bubbles / bottle, refractive index standard deviation 0.00020, lightweight coefficient 0.57. Overall energy consumption is reduced by 13.2% compared to conventional processes.

[0030] Example 3 (a) Waste glass pretreatment Colorless waste beverage bottles were collected, with coarse particles at 67 wt% and fine particles at 33 wt%; the residual iron content after iron removal was 29 mg / kg; the moisture content was 0.18 wt%; and the chemical composition met the formulation requirements.

[0031] (II) Preparation of batch materials Quartz sand 63wt%, soda ash 19wt%, limestone 6wt%, dolomite 5wt%, feldspar 4wt% (total 100%), moisture content 4.5wt%. Clarifying agents: sodium sulfate 0.45wt%, antimony oxide 0.18wt%. The batch material accounts for 48wt% of the total batch, with waste glass added at 50wt%.

[0032] (III) Grading and Step-by-Step Feeding Fine-grained waste glass as a base (14 wt% of the total batch, 48 mm thick) → batching material (48 wt% of the total batch) → remaining mixed waste glass as a cover (36 wt% of the total batch, coarse-to-fine ratio 2.2:1).

[0033] (iv) Gradient temperature melting Preheating: 11℃ / min to 610℃, hold for 22 min; softening and melting: 7.5℃ / min to 1010℃, hold for 32 min; main melting: 4.5℃ / min to 1475℃, hold for 3.5 h; oxy-fuel combustion, oxygen-fuel ratio 1.09:1; clarification and homogenization: 1490℃, hold for 2.5 h, electric flux electrode power density 1.0 kW / m². Waste heat recovery efficiency 68%.

[0034] (v) Stirring and homogenization The stirring speed was 75 r / min, the immersion depth was 74%, and the duration was 60 min. Nitrogen bubbling was used at a pressure of 0.24 MPa and a flow rate of 3.8 L / min. The online refractive index root mean square deviation was 0.00032, and no enhanced control was triggered.

[0035] (vi) Quality inspection and cooling molding Sampling and testing: 2.6 bubbles / kg, refractive index standard deviation 0.00028, maximum residual particle size 0.09mm, outflow deviation ±1.9%, all items passed. Cooled to 1200℃ at 3℃ / min, pressure blow molding was performed to produce 200mL colorless lightweight beverage bottles. Finished product testing: wall thickness deviation ±0.13mm, vertical load 7800N, thermal shock resistance 44℃, internal stress 11nm / mm, 1.9 bubbles / bottle, refractive index standard deviation 0.00022, lightweight coefficient 0.61. Overall energy consumption was reduced by 14.6% compared to conventional processes.

[0036] Comparative Example 1 A 330mL brown beer bottle was prepared using a traditional process: 20wt% waste glass was added, all raw materials were mixed and added at once without particle size classification; the melting temperature was 1510℃, with direct and rapid heating without staged preheating; there was no mechanical stirring, no bubbling assistance, and no waste heat recovery; the clarification and homogenization temperature was 1515℃, and the temperature was maintained for 2.5h.

[0037] Comparative test results: 7.8 bubbles / kg (1.8 bubbles / kg in Example 1 of this invention); refractive index variance 0.00062 (0.00021 in Example 1 of this invention); comprehensive energy consumption per unit mass of molten glass 1280 kcal / kg, compared to 1126 kcal / kg in Example 1 of this invention, resulting in an energy saving rate of 12.0%. The comparative results clearly demonstrate that this invention has significant advantages over existing technologies in eliminating bubble defects, eliminating streak defects, and reducing energy consumption.

[0038] The above descriptions of the embodiments are merely illustrative of preferred embodiments of the technical solutions of the present invention. Those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention, and all such modifications and changes fall within the scope defined by the claims of the present invention.

[0039] Table 1 Summary of key technical indicators comparing the embodiments and comparative examples

[0040] Note: “—” in the table indicates that the comparative sample was not tested under the process conditions, or that the process itself is not applicable to this parameter.

Claims

1. A melting and homogenization method for lightweight bottles and jars with high waste glass content, characterized in that, The method is applicable to batch systems of soda-lime-silica glass bottles and jars with a waste glass content of 30wt% to 50wt%, and the method includes the following steps in sequence: Step 1, Waste Glass Pretreatment: The waste glass is crushed and screened to classify it into coarse and fine particles, with coarse particles accounting for 60wt%–70wt% of the total waste glass mass and fine particles accounting for 30wt%–40wt% of the total waste glass mass; the screened waste glass is then subjected to magnetic separation to remove iron, ensuring that the residual iron content does not exceed 50mg / kg; the waste glass is then washed and dried to ensure that the moisture content does not exceed 0.3wt%. Step 2, graded and step-by-step feeding process: Feed the materials into the furnace inlet in the following order: The first step is to continuously and uniformly add 10wt% to 15wt% of fine-grained waste glass, which accounts for 10wt% to 15wt% of the total batch material, to form an initial base layer. The thickness of the base layer is controlled between 30mm and 50mm. The second step involves adding a batching material to the base layer. This batching material is made by mixing quartz sand, soda ash, limestone, dolomite, feldspar, and a clarifying agent. The amount of this batching material added accounts for 50 wt% to 60 wt% of the total batch size. The third step involves mixing the remaining waste glass, including coarse and fine particles, at a mass ratio of coarse to fine particles of (1.5–2.5):1, and then covering the surface of the compound layer to form a top covering material. Step 3, Gradient Temperature Melting Step: Melt the batch material according to the following temperature regime: Preheating stage: The furnace temperature is raised from room temperature to 550℃~620℃ at a heating rate of 8℃ / min~12℃ / min, and held at this temperature for 20min~30min. Softening and melting stage: The furnace temperature is raised from 550℃~620℃ to 950℃~1020℃ at a heating rate of 5℃ / min~8℃ / min, and held at this temperature for 30min~45min. Main melting stage: The furnace temperature is raised from 950℃~1020℃ to 1430℃~1480℃ at a heating rate of 3℃ / min~5℃ / min, and the main melting is carried out within this temperature range. The main melting holding time is 2.0h~3.5h. Clarification and homogenization stage: Adjust the furnace temperature to 1450℃~1500℃ and hold it within this temperature range for 1.5h~2.5h; Step 4, Homogenization Step: In the clarification and homogenization stage, a platinum-rhodium alloy stirring paddle located at the bottom of the clarification zone of the melting furnace is used to mechanically stir the molten glass at a stirring speed of 40 r / min to 80 r / min. The stirring paddle is immersed in the molten glass to a depth of 60% to 75% of the total depth of the molten glass, and the stirring duration is 30 min to 60 min. Simultaneously, nitrogen gas with a pressure of 0.15 MPa to 0.25 MPa and a flow rate of 2.0 L / min to 4.0 L / min is introduced into the molten glass through the bubbling pipe at the bottom of the melting furnace to help remove bubbles. Step 5, Cooling and Forming Step: The homogenized molten glass is cooled to a working temperature of 1180℃~1230℃ at a cooling rate of 2℃ / min~4℃ / min and then sent to the forming process for lightweight bottle and can forming.

2. The method according to claim 1, characterized in that, In step 1, the chemical composition of the waste glass meets the following requirements: SiO2 content not less than 68wt%, Na2O content 10wt%~14wt%, CaO content 8wt%~12wt%, MgO content not more than 4wt%, Al2O3 content not more than 3wt%, and Fe2O3 content not more than 0.06wt%. The waste glass is stored separately according to color classification. When used, it is mixed with colorless:brown:green in a mass ratio of (50~70):(15~30):(10~20) to control the spectral transmittance of the finished glass melt.

3. The method according to claim 1, characterized in that, In step 2, the composition of the batch material by mass percentage is as follows: 58wt%–65wt% quartz sand, 18wt%–22wt% soda ash, 5wt%–8wt% limestone, 3wt%–6wt% dolomite, and 2wt%–4wt% feldspar; the clarifying agent is a composite system of sodium sulfate and antimony oxide, with sodium sulfate accounting for 0.3wt%–0.5wt% of the total batch material and antimony oxide accounting for 0.1wt%–0.2wt% of the total batch material; the moisture content of the batch material is controlled at 3wt%–5wt%, and the mixing uniformity is judged by the standard deviation of the refractive index of the molten glass not exceeding 0.0005.

4. The method according to claim 1, characterized in that, In step 3, the main melting stage is heated by full oxygen combustion, with natural gas as the fuel and an oxygen-fuel ratio of (1.05~1.10):1; the temperature at the feeding end of the furnace is 60℃~100℃ lower than the temperature at the discharge end; the depth of the molten glass in the furnace is controlled at 900mm~1100mm, and the fluctuation range of the molten glass surface does not exceed ±5mm.

5. The method according to claim 1, characterized in that, In step 4, the bubbling tubes are arranged horizontally and evenly along the bottom of the refining zone of the melting furnace, with a spacing of 500mm to 700mm and an inner diameter of 8mm to 12mm. The purity of the nitrogen gas used is not less than 99.9 vol. After the stirring and bubbling treatment is completed, the qualified criteria are that the number of bubbles does not exceed 3 per kg, the root mean square deviation of the refractive index does not exceed 0.0003, and the uniformity deviation of the glass melt viscosity does not exceed ±0.5%.

6. The method according to claim 1, characterized in that, The method further includes an electric melting assistance step in the clarification and homogenization stage of step 3: an electrode rod is installed in the clarification zone of the melting furnace, and resistance heating is performed by passing alternating current through the glass melt. The electrode power density is controlled at 0.5kW / m² to 1.2kW / m² to enhance the convective heat transfer at the bottom of the glass melt and help eliminate stripe defects caused by temperature gradient.

7. The method according to any one of claims 1 to 6, characterized in that, Before step 5, an online quality inspection step for molten glass is also included: the homogenized molten glass is sampled and tested for the following indicators: (a) number of visible bubbles ≤ 3 / kg; (b) standard deviation of refractive index ≤ 0.0003; (c) diameter of residual broken glass particles ≤ 0.1mm; (d) deviation of molten glass outflow ≤ ±2%; only when the test results meet all the above indicators can the forming process be entered; otherwise, the homogenization treatment time is extended until the quality requirements are met.

8. The method according to claim 1, characterized in that, The method further includes a waste heat cascade utilization step: in the preheating stage and main melting stage of step 3, the sensible heat of the flue gas is recovered through a waste heat exchanger set at the outlet of the melting furnace flue. The recovered heat is used for: (a) hot air heating in the waste glass drying process in step 1, raising the temperature of the drying hot air to 80℃~120℃ to replace the independent heating heat source; (b) preheating treatment of the batch material in step 2, preheating the temperature of the batch material to 50℃~80℃ before feeding, so as to increase the temperature of the batch material entering the furnace, shorten the melting journey of the batch material in the melting furnace, and further reduce the gas consumption; the heat recovery efficiency of the waste heat recovery system is not less than 60%.

9. The method according to claim 1, characterized in that, The method further includes online monitoring and feedback control steps: an online refractive index sensor and a thermal imaging temperature field detection system are installed in the refining zone of the melting furnace to collect data on the uniformity of the glass melt refractive index distribution and the temperature field of the liquid surface in real time; when the online refractive index root mean square error is greater than 0.0004, an automatic triggering command to increase the stirring speed is executed, increasing the stirring speed by 10 r / min to 20 r / min, while simultaneously increasing the nitrogen bubbling flow rate by 0.5 L / min to 1.0 L / min, until the refractive index root mean square error recovers to below 0.0003; when the online thermal imaging detects a liquid surface temperature difference exceeding 50°C, the melting furnace combustion system is automatically adjusted to reduce the area of ​​temperature non-uniformity; the online monitoring data storage cycle is no less than once every 30 seconds, and the data is transmitted to the production management system in real time.

10. A lightweight glass bottle or jar manufactured using the method described in any one of claims 1 to 9, characterized in that, The wall thickness uniformity of the glass bottles and jars shall not exceed ±0.15mm, the lightweight coefficient LW shall not exceed 0.65, the vertical load strength shall not be less than 7000N, the thermal shock resistance shall not be less than 42℃, the internal stress level shall not exceed 12nm / mm, the number of bubbles shall not exceed 2 per bottle, and the refractive index uniformity shall meet the standard deviation ≤0.0002. The waste glass content of the glass bottles and jars shall be 30wt%~50wt%, which, compared with the conventional process with a waste glass content not exceeding 20wt%, reduces the comprehensive energy consumption per unit mass of molten glass by 10%~15%.

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