Method for producing silicon dioxide and β-quartz from recycled residual materials in waterjet cutting waste sand

Abstract

A method for producing silica and β-quartz from recycled silica material in waterjet cutting consumables aims to obtain silica powder and β-quartz products by washing, dewatering, drying, gravity screening, magnetic adsorption, alkali soaking, water washing, dewatering, drying, and high-temperature melting of waste materials in the inorganic sludge generated after waterjet cutting. This achieves the effect of sustainable recycling of materials and reduces resource waste.

Description

Technical Field

[0001] This invention relates to the technical field of recycling waterjet cutting consumables, and specifically to a method for producing silicon dioxide and β-quartz from silicon material recycled from waste sand of waterjet cutting consumables. Prior Technology

[0002] The consumable material used in waterjet cutting is garnet sand. Garnet sand contains metal materials such as silicon, iron, and aluminum. However, because garnet sand has a high hardness, usually above 7.5, it is usually used in waterjet cutting to cut hard materials such as marble and steel. The waste sand obtained after the garnet sand is sprayed out by the waterjet is usually collected and discarded directly.

[0003] However, the inorganic sludge produced by water jet cutting contains a considerable amount of silicon or quartz. If these substances can be recycled and reused, the waste of natural resources can be reduced. Summary of the Invention

[0004] This invention provides a method for producing silica and β-quartz from the recycled silica material of waste sand from waterjet cutting consumables. The main purpose is to obtain silica powder and β-quartz products by washing, dehydrating, drying, gravity screening, magnetic adsorption, alkali soaking, water washing, dehydration, drying, and high-temperature melting of waste materials in the inorganic sludge generated after waterjet cutting.

[0005] Therefore, the manufacturing process of the present invention includes the following:

[0006] Step 1: Collect the inorganic sludge generated after using the waterjet cutting equipment;

[0007] Step 2: The obtained inorganic sludge is slowly washed with clean water to remove substances with a density lower than 1, resulting in high-density inorganic sludge;

[0008] Step 3: Dewater the high-density inorganic sludge using a centrifuge. The moisture content of the dewatered high-density inorganic sludge is between 10% and 20%.

[0009] Step 4: Dry the dehydrated high-density inorganic sludge to remove moisture, and the inorganic sludge should be in powder form;

[0010] Step 5: Feed the dried high-density inorganic sludge into a gravity screening machine. Set the gravity screening machine to a range of 2.5 grams or more per cubic centimeter to obtain high-density powder.

[0011] Step Six: Pour the high-density powder into a magnetic separator to remove metallic impurities from the powder through magnetic separation;

[0012] Step 7: Add the high-density powder to the high-concentration sodium hydroxide solution. After the high-density powder reacts with the high-concentration sodium hydroxide solution in an exothermic reaction, an insoluble white powder will be produced. Collect the white powder after the exothermic reaction is complete.

[0013] Step 8: Add the white powder from Step 7 to clean water and wash to obtain a slurry containing white powder;

[0014] Step 9: Dehydrate the white powder slurry from Step 8 to obtain a slightly moist white powder with a moisture content between 10% and 20%.

[0015] Step 10: Dry the slightly damp white powder from Step 9 to obtain the dried white powder, which is silicon dioxide powder;

[0016] Step 11: Place the silica powder from Step 10 into a heating kettle and heat it to a temperature exceeding 600°C. The silica powder will melt, and the melted product will be β-quartz.

[0017] The recycling method of this invention can recycle inorganic sludge after water jet cutting to obtain silicon dioxide powder and β-quartz, achieving the effect of sustainable material recycling and reducing resource waste. Simple Explanation of the Diagram

[0018] Figure 1: Block flowchart of the present invention. Figure 2: System diagram of the present invention. Implementation

[0019] As shown in Figure 1, the present invention provides a method for producing silicon dioxide and β-quartz from silicon material recycled from waste sand of water jet cutting consumables, comprising steps one S1 to eleven S11, which are described in detail below.

[0020] Step S1: As shown in Figure 1, inorganic sludge D generated after the water jet cutting equipment is used is collected through inorganic sludge collection device A1.

[0021] Step 2 S2: As shown in Figure 1, the inorganic sludge D obtained can be slowly washed with clean water using a water flow cleaner A2, so that substances with a density lower than 1 in the inorganic sludge D are removed, resulting in high-density inorganic sludge D'.

[0022] Step 3 S3: As shown in Figure 1, the high-density inorganic sludge D' after sedimentation is dewatered through centrifuge A3 to obtain high-density inorganic sludge D' with a water content of less than 20%; wherein, the centrifuge A3 is initially set at 200 rpm for 1 minute of dewatering, then increased to 400 rpm for 3 minutes of dewatering, then increased to 800 rpm for 3 minutes of dewatering in the middle stage, and finally increased to 1300 rpm for 5 minutes of dewatering.

[0023] Step 4 S4: As shown in Figure 1, the high-density inorganic sludge D' with a moisture content of less than 20% in step 3 S3 is dried so that its moisture content is less than 5% and the high-density inorganic sludge D' is in powder form; the aforementioned drying method can be one of the following: (1) natural drying, the inorganic sludge D is dried for 3 to 15 days at an ambient temperature of 20℃~40℃ and a humidity of 20%~60%; (2) or the inorganic sludge D is dried using a dryer A4 at a drying temperature of 55℃~90℃ for 12 to 24 minutes; the aforementioned drying time is inversely proportional to the temperature, the higher the drying temperature, the shorter the drying time.

[0024] Step 5 S5: As shown in Figure 1, use a gravity sieve A5, set the range to a density greater than 2.5 grams, to obtain a high specific gravity powder D1.

[0025] Step 6 S6: As shown in Figure 1, use magnetic separator A6 to perform magnetic separation on the high specific gravity powder D1 from step 5 S5; wherein, magnetic separator A6 is set to above 10000 Gauss and removes metallic impurities from the high specific gravity powder D1.

[0026] Step 7 S7: As shown in Figure 1, high-density powder D1 is added to a high-concentration sodium hydroxide solution through a mixer A7. The concentration of the sodium hydroxide solution is above 3. The soaking ratio is 1 gram of high-density powder D1 added to a high-concentration sodium hydroxide solution of 70°C or above. After the high-density powder and the high-concentration sodium hydroxide solution produce an exothermic reaction, an insoluble white powder D2 will be produced. The white powder D2 is collected after the exothermic reaction is over.

[0027] Step 8 S8: As shown in Figure 1, the white powder D2 from step 7 S7 is added to clean water and washed through a cleaning machine A8 to obtain a slurry D3 containing white powder.

[0028] Step 9 S9: As shown in Figure 1, the white powder slurry D3 from step 8 S8 is dehydrated through a dehydrator A9 to obtain a slightly moist white powder D4 with a moisture content between 10% and 20%.

[0029] Step 10 S10: Dry the slightly moist white powder D4 obtained in step 9 S9 to obtain the dried white powder, which is silicon dioxide powder D5. The aforementioned drying method can be natural exposure, natural air drying, or using a dryer A4, all of which are applicable to this invention.

[0030] Step 11 S11: Place the silica powder D5 from step 10 S10 into an autoclave A10 and heat it to a temperature exceeding 600°C. The silica powder D5 will melt, and the melted product will be β-quartz D6.

[0031] Accordingly, the present invention can recycle the inorganic sludge generated from the use of garnet sand consumables, and then use different processes such as washing, dehydration, drying, gravity screening, magnetic adsorption, alkali soaking, water washing, dehydration, drying, and high-temperature melting to obtain silicon dioxide powder D5 and β-quartz products, thereby achieving the effect of sustainable recycling of materials and reducing resource waste.

[0032] In conclusion, the technical methods of this invention have not been seen in any books or publications or publicly used, and thus meet the requirements for an invention patent application. We earnestly request your esteemed authority to grant the patent as soon as possible, and we are deeply grateful for your consideration.

[0033] It should be noted that the above description is a specific embodiment of the present invention and the technical principles used. Any changes made according to the concept of the present invention, if the resulting functions do not exceed the spirit covered by the specification and drawings, should be within the scope of the present invention and are hereby stated.

[0034] S1: Step One S2: Step Two S3: Step Three S4: Step Four S5: Step Five S6: Step Six S7: Step Seven S8: Step Eight S9: Step Nine S10: Step Ten S11: Step Eleven D: Inorganic sludge D': High-density inorganic sludge D1: High specific gravity powder D2: White powder D3: White powder paste D4: Slightly moist white powder D5: Silicon dioxide powder A1: Inorganic sludge collection device A2: Water Flow Cleaning Machine A3: Centrifuge A4: Dryer A5: Gravity Screening Machine A6: Magnetic separator A7: Mixer A8: Cleaning Machine A9: Dehydrator A10: High-pressure autoclave

Claims

1. A method for producing silica and β-quartz from silicon material recycled from waste sand of waterjet cutting consumables, comprising: Step 1: collecting inorganic sludge generated after the use of waterjet cutting equipment; Step 2: slowly washing the obtained inorganic sludge with clean water to remove substances with a density less than 1, obtaining high-density inorganic sludge; Step 3: dewatering the high-density inorganic sludge to obtain high-density inorganic sludge with a moisture content of 10% to 20%; Step 4: drying the high-density inorganic sludge with a moisture content of 10% to 20% in Step 3, so that its moisture content is below 5% and the high-density inorganic sludge is in powder form; Step 5: feeding the dried high-density inorganic sludge into a gravity screening machine, the gravity screening machine being set to a specific gravity value of 2.5 grams or more per cubic centimeter for gravity screening to obtain high-density powder; Step Six: Use a magnetic separator to remove metallic impurities from the high-density powder. Step Seven: Add the high-density powder to a high-concentration sodium hydroxide solution. An exothermic reaction occurs between the powder and the solution, producing an insoluble white powder. Collect this white powder after the reaction is complete. Step Eight: Wash the white powder from Step Seven with water to obtain a slurry containing the white powder. Step Nine: Dehydrate the slurry from Step Eight to obtain a slightly moist white powder with a moisture content of 10%–20%. Step Ten: Dry the slightly moist white powder from Step Nine to obtain dried white powder, which is silicon dioxide powder. Step Eleven: Place the silicon dioxide powder from Step Ten into a heating kettle and heat it to a temperature exceeding 600°C. The silicon dioxide powder melts, and the melted powder is β-quartz.

2. The method for producing silica and β-quartz from recycled silica material of waste sand from waterjet cutting consumables as described in claim 1, wherein, Step 3: Initially, the centrifuge speed is set at 200 rpm for 1 minute of dehydration. Then, the speed is increased to 400 rpm for 3 minutes of dehydration. In the middle stage, the speed is increased to 800 rpm for 3 minutes of dehydration. Finally, the speed is increased to 1300 rpm for 5 minutes of dehydration.

3. The method for producing silica and β-quartz from recycled silica material of waste sand from waterjet cutting consumables as described in claim 1, wherein, Steps four and nine are performed using natural drying, with an ambient temperature of 20℃~40℃ and humidity of 20%~60%, for 3 to 15 days.

4. The method for producing silica and β-quartz from recycled silica material of waste sand from waterjet cutting consumables as described in claim 1, wherein, Steps four and nine are dried using heating equipment at a temperature between 55°C and 90°C for 12 to 24 minutes.

5. The method for producing silica and β-quartz from recycled silica material of waste sand from waterjet cutting consumables as described in claim 1, wherein, Step 5: Set the magnetic separator to above 10,000 Gauss to remove metallic impurities from high-density powders.

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