Method for recycling of bead sand production waste

Abstract

A method for recycling of bead sand production waste, comprising the following steps: S1, collecting waste; collecting waste generated during preparation of bead sand; S2, mixing; mixing water glass into the waste, so that the waste and the water glass are fully mixed; S3, pre-solidification treatment; filling the waste mixed with the water glass into a sprue cup mold, and introducing carbon dioxide gas into the loose waste in the mold; S4, compaction; S5, solidification; taking the compacted material out of the mold as a whole, standing, naturally solidifying, and then placing it in a drying oven for isolated flame drying at a temperature of 160-200 DEG C; S6, coating; S7, coating drying; the application turns waste into treasure, changes the waste into a sprue cup for casting, and changes into economic income; can avoid the lint of fibrous materials such as aluminum silicate fiber or high-aluminum fiber flying everywhere, polluting the environment, can greatly improve the possible environmental pollution, and protect the health of the bead sand related production personnel.

Description

Technical Field

[0001] This invention relates to the field of hazardous waste treatment technology, and in particular to a method for recycling waste materials from the production of alumina. Background Technology

[0002] As is well known, quartz sand is a high-grade substitute for silica sand, made from high-quality bauxite. The advantages of silica sand are its wide range of applications and low cost, but its disadvantages are also quite obvious: first, its large expansion coefficient leads to low casting precision; second, the surface of the casting is severely adhered with sand, making sand removal difficult. Quartz sand can overcome these disadvantages, thereby greatly improving the quality of castings, and is especially suitable for making high-quality castings.

[0003] However, the production of refractory sand generates a large amount of solid waste, mainly a mixture of fibrous materials such as aluminosilicate fibers or high-alumina fibers and granules such as refractory sand and refractory sand powder. The majority of the volume is composed of fibrous materials such as aluminosilicate fibers or high-alumina fibers, with only a small amount of granules such as refractory sand powder. Aluminosilicate fibers or high-alumina fibers could be used as raw materials for producing refractory products, but because they contain a large number of granules such as refractory sand and refractory sand powder of varying diameters, separating the granules is quite difficult.

[0004] Chinese Patent (Announcement No.: CN108046581B) discloses a dry treatment process for solid waste surrounding abrasive sand. This invention belongs to the field of abrasive sand solid waste treatment technology, and particularly relates to a dry treatment process for solid waste surrounding abrasive sand, including steps such as raw material drying, dispersing, loosening and air separation, grading, crushing and screening. It has the advantages of simple process, high recycling efficiency, and no environmental pollution; however, its process steps are complicated and the production cost is high. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention discloses a method for recycling waste materials from the production of abrasive sand.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A method for recycling waste from abrasive production includes the following steps:

[0008] S1. Collect waste materials; collect the waste materials generated during the preparation of alumina, the waste materials are alumina, aluminosilicate fiber, and high-alumina fiber;

[0009] S2. Mixing: Water glass is mixed into the waste material to ensure thorough mixing of the waste material and water glass.

[0010] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold.

[0011] S4. Compaction; Compacting waste material in a mold;

[0012] S5. Curing: Remove the compacted material from the mold as a whole, let it stand and cure naturally, and then place it in a drying oven for isolated flame drying. The drying temperature range is 160℃~200℃. The compacted material is isolated from the flame during the drying process to completely complete the solidification of the compacted material.

[0013] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0014] S7. Coating drying: The compacted material coated with coating is dried as a whole to obtain the pouring cup product.

[0015] Preferably, in step S6, the coating process is dip coating, brush coating, or spray coating.

[0016] Preferably, in step S6, the coating is a water-based refractory coating.

[0017] Preferably, in step S4, compaction is performed once or multiple times, by manually pounding with a hammer or other hand tools, or by using a mechanical, electric, pneumatic or hydraulic thrust device for compaction.

[0018] By employing the technical solution described above, the present invention has the following beneficial effects:

[0019] This invention discloses a method for reusing waste generated during the production of alumina silicate. The waste is used as raw material, primarily a mixture of fibrous materials such as alumina silicate fibers or high-alumina fibers and alumina silicate particles. By mixing these fibrous materials with water glass and then introducing carbon dioxide, a solidified product is obtained and manufactured into casting cups for use in the foundry industry. This method solves the problems of large space requirements for waste disposal and the economic costs associated with solid waste treatment. It transforms waste into valuable resources, converting it into casting cups and generating economic income. Furthermore, it avoids the problem of fibrous materials like alumina silicate fibers or high-alumina fibers causing environmental pollution, significantly reducing potential environmental pollution and protecting the health of personnel involved in alumina silicate production. Detailed Implementation

[0020] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are for the convenience of describing the present invention, and not to indicate or imply that the device or element referred to must have a specific orientation.

[0021] Example 1:

[0022] A method for recycling waste from abrasive production includes the following steps:

[0023] S1. Collect waste materials; collect the waste materials generated during the preparation of alumina, the waste materials are alumina, aluminosilicate fiber, and high-alumina fiber;

[0024] S2. Mixing: Water glass is mixed into the waste material to ensure thorough mixing of the waste material and water glass.

[0025] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold; it is necessary to introduce carbon dioxide gas into the loose waste material in the mold before compaction. The loose waste material has good air permeability, which is conducive to the full integration of carbon dioxide gas, preparing for the curing reaction, and avoiding poor bonding effect of the pouring cup product after compaction due to air permeability, resulting in disintegration and damage;

[0026] S4. Compaction; Compacting waste in a mold; Compacting waste until it forms the size and shape of the pouring cup and the compacted material is able to bond together; It can be done by one or multiple compactions, by hammering or other hand tools, or by mechanical, electric, pneumatic or hydraulic thrust devices.

[0027] S5. Curing: Remove the compacted material from the mold as a whole, let it stand and cure naturally, and then place it in a drying oven for isolated flame drying. The drying temperature range is 160℃~200℃, and the compacted material is isolated from the flame during the drying process; Complete the solidification of the compacted material: Let it stand and cure naturally for a period of time to complete the further curing reaction, and then dry it to remove most of the moisture inside the compacted material and complete the complete solidification reaction;

[0028] S6. Apply coating; apply coating to the outer surface of the compacted material; this helps to make the gate surface smooth and facilitates smooth pouring; applying coating prevents the condensation of fibrous materials such as aluminum silicate fiber or high alumina fiber from falling off during pouring and entering the pouring fluid; the coating process can be dip coating, brush coating, or spray coating; the coating is a water-based refractory coating.

[0029] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating and obtain the pouring cup product.

[0030] Example 2:

[0031] A method for recycling waste from abrasive production includes the following steps:

[0032] S1. Collect waste materials; collect 750 grams of waste materials generated during the preparation of agate sand.

[0033] S2. Mixing: Add 250ml of water glass to the waste and stir by hand to ensure that the waste and water glass are fully mixed.

[0034] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 4 minutes and 30 seconds at a carbon dioxide pressure of 0.05 MPa.

[0035] S4. Compaction; manual hammering for compaction;

[0036] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 80 minutes.

[0037] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0038] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0039] Example 3:

[0040] A method for recycling waste from abrasive production includes the following steps:

[0041] S1. Collect waste materials; collect 600 grams of waste materials generated during the preparation of precious pearl sand.

[0042] S2. Mixing: Add 600ml of water glass to the waste and stir by hand to ensure that the waste and water glass are fully mixed.

[0043] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 3 minutes and 30 seconds at a carbon dioxide pressure of 0.1 MPa.

[0044] S4. Compaction; manual hammering for compaction;

[0045] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 80 minutes.

[0046] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0047] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0048] Example 4:

[0049] A method for recycling waste from abrasive production includes the following steps:

[0050] S1. Collect waste materials; collect 900 grams of waste materials generated during the preparation of precious pearl sand.

[0051] S2. Mixing: Add 300ml of water glass to the waste and stir by hand to ensure that the waste and water glass are fully mixed.

[0052] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 2 minutes at a carbon dioxide pressure of 0.05 MPa.

[0053] S4. Compaction; manual hammering for compaction;

[0054] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 80 minutes.

[0055] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0056] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0057] Example 5:

[0058] A method for recycling waste from abrasive production includes the following steps:

[0059] S1. Collect waste materials; collect 600 grams of waste materials generated during the preparation of precious pearl sand.

[0060] S2. Mixing: Add 500ml of water glass to the waste and stir by hand to ensure that the waste and water glass are fully mixed.

[0061] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 3 minutes and 30 seconds at a carbon dioxide pressure of 0.1 MPa.

[0062] S4. Compaction; manual hammering for compaction;

[0063] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 80 minutes.

[0064] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0065] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0066] Example 6:

[0067] A method for recycling waste from abrasive production includes the following steps:

[0068] S1. Collect waste materials; collect 2000 grams of waste materials generated during the preparation of precious pearl sand.

[0069] S2. Mixing: Add 1000ml of water glass to the waste and mechanically stir to ensure that the waste and water glass are fully mixed.

[0070] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 60 seconds at a carbon dioxide pressure of 0.5 MPa.

[0071] S4. Compaction; hydraulic compaction;

[0072] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 120 minutes.

[0073] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0074] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0075] Example 7:

[0076] A method for recycling waste from abrasive production includes the following steps:

[0077] S1. Collect waste materials; collect 2000 grams of waste materials generated during the preparation of precious pearl sand.

[0078] S2. Mixing: Add 900ml of water glass to the waste and mix mechanically to ensure that the waste and water glass are fully mixed.

[0079] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 60 seconds at a carbon dioxide pressure of 0.5 MPa.

[0080] S4. Compaction; hydraulic compaction;

[0081] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 120 minutes.

[0082] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0083] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0084] Example 8:

[0085] A method for recycling waste from abrasive production includes the following steps:

[0086] S1. Collect waste materials; collect 2000 grams of waste materials generated during the preparation of precious pearl sand.

[0087] S2. Mixing: Add 800ml of water glass to the waste and mix mechanically to ensure that the waste and water glass are fully mixed.

[0088] S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold for 60 seconds at a carbon dioxide pressure of 0.5 MPa.

[0089] S4. Compaction; hydraulic compaction;

[0090] S5. Curing: Remove the compacted material from the mold as a whole, let it stand for 5 minutes, and then place it in a drying oven for isolated flame drying at 180℃ for 120 minutes.

[0091] S6. Apply coating; apply coating to the outer surface of the compacted material;

[0092] S7. Coating drying: Dry the compacted material coated with coating as a whole to obtain the pouring cup product; dry the compacted material to cure the coating. The drying temperature is 80℃ and the drying time is 60 minutes to obtain the pouring cup product.

[0093] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents within this invention.

Claims

1. A method for recycling waste from the production of abrasive powder, characterized by: comprising... The following steps: S1. Collect waste materials; collect the waste materials generated during the preparation of alumina, the waste materials are alumina, aluminosilicate fiber, and high-alumina fiber; S2. Mixing: Water glass is mixed into the waste material to ensure thorough mixing of the waste material and water glass. S3. Pre-curing treatment: Fill the pouring cup mold with waste material mixed with water glass, and introduce carbon dioxide gas into the loose waste material in the mold. S4. Compaction; Compacting waste material in a mold; S5. Curing: Remove the compacted material from the mold as a whole, let it stand and cure naturally, and then place it in a drying oven for isolated flame drying. The drying temperature range is 160℃~200℃. The compacted material is isolated from the flame during the drying process to completely complete the solidification of the compacted material. S6. Apply coating; apply coating to the outer surface of the compacted material; S7. Coating drying: The compacted material coated with coating is dried as a whole to obtain the pouring cup product.

2. The method for recycling alumina production waste as described in claim 1, characterized in that: In step S6, the coating process is dip coating, brush coating, or spray coating.

3. The method for recycling waste from the production of alumina as described in claim 1, characterized in that: In step S6, the coating is a water-based refractory coating.

4. The method for recycling alumina production waste as described in claim 1, characterized in that: In step S4, compaction may be performed once or multiple times.