A method for producing marble rough blocks based on marble offcuts

Abstract

The application discloses a method for producing marble rough stone based on marble offcuts, and the marble rough stone comprises the following raw materials: marble offcuts, powder, andalusite particles, a binder, and water. The application defines the raw material composition of the marble rough stone, and the marble offcuts and the andalusite particles with high strength and different gradations are matched as aggregates, and then the gaps between the marble offcuts and the andalusite particles are filled by the powder and the binder, so that the obtained marble rough stone is greatly reduced in internal porosity, and the strength of the marble rough stone itself is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of marble rough stone production, and particularly relates to a method for producing marble rough stone based on marble offcut. BACKGROUND

[0002] Artificial marble, also known as artificial stone, artificial stone, artificial synthetic stone, etc., is a whole that is glued from stone slag or stone powder and used as a building material. If the product is in the shape of a large block of hexahedron, it is called artificial marble rough stone. The marble rough stone can be processed by cutting, grinding, polishing, etc. to obtain decorative building boards or profiles.

[0003] The artificial marble glued by cement, gypsum, beryllium, etc. is called inorganic artificial marble. Under normal circumstances, the inorganic artificial marble rough stone is made of natural stone powder, industrial waste slag or inorganic chemical raw materials as basic raw materials, and special cement as adhesive, through stirring, pouring, vibration and curing. Its advantages are that it does not contain volatile organic compounds harmful to human body, has strong heat resistance, fire resistance and aging resistance, but due to the presence of many pores inside, the stone has low strength, low gloss and poor stain resistance, and can only be used as low-grade decorative building materials. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a method for producing marble rough stone based on marble offcut.

[0005] The present application adopts the following technical scheme:

[0006] A method for producing marble rough stone based on marble offcut, the marble rough stone comprises the following raw materials in parts by weight: marble offcut 50-60 parts, powder 30-40 parts, beryl particles 20-30 parts, binder 18-22 parts, and water 25-35 parts.

[0007] The preparation method comprises the following steps:

[0008] Step one: crushing and screening the recycled marble offcut to obtain base material with a particle size of 5-8 mm and fine material with a particle size of less than 5 mm, and then grinding the fine material with a particle size of less than 5 mm to obtain fine powder with a particle size of less than 1 mm;

[0009] Step two: mixing the fine powder obtained in step one with the powder and the binder uniformly, then adding the base material obtained in step one and the beryl particles, and continuing to mix and stir uniformly to obtain a premix;

[0010] Step three: loading the stirred premix into a mold, vibrating and spreading it evenly, and then sending it into a pressing device for pressing and forming;

[0011] Step four, after the pressing is completed, demolding, and curing to obtain the marble rough stone.

[0012] Further, the particle size of the andalusite particles is 3-5 mm, and the particle size of the powder is 80-100 mesh.

[0013] Further, the binder is composed of the following raw materials by weight: 50-60 parts of wollastonite powder, 20-30 parts of mudstone, 15-22 parts of portland cement, and 15-20 parts of attapulgite.

[0014] Further, the powder is composed of bentonite, sepiolite powder, and calcite in a weight ratio of 1:1-1.2:1.5-1.6.

[0015] Further, in step four, the curing process is as follows: first, the demolded blank is sent into a kiln with a preheating temperature of 180-200 DEG C, and after the kiln cooling chamber reaches room temperature, it is placed in the kiln for 12 hours or more, then the kiln is gradually heated to 115-125 DEG C at a rate of 1.5 DEG C / min, and then the kiln is cooled to room temperature for 5-6 hours to complete the curing work and obtain the limited marble rough stone.

[0016] Further, in step three, the pressing pressure of the pressing equipment is 5-6 kg, the vacuum degree is -0.10 MPa, and the amplitude is 0.65 mm.

[0017] From the above description of the present application, compared with the prior art, the beneficial effects of the present application are:

[0018] First, the present application limits the raw material composition of the marble rough stone, uses marble edge and corner material with high strength and different gradation and andalusite particles as aggregate, and fills the gap between the marble edge and corner material and the andalusite particles with the powder and the binder, greatly reducing the pores in the obtained marble rough stone and ensuring the strength of the marble rough stone; wherein the pretreatment method of the marble edge and corner material recycles the fine powder generated during the crushing process as one of the filling materials between the base material and the andalusite particles, effectively improving the recovery rate of waste resources and reducing the impact of waste resource accumulation on the environment.

[0019] Second, the composition of the binder is specifically limited, with wollastonite powder as the main component, combined with adhesive mudstone and attapulgite, which not only ensures the adhesion between the powder, the marble edge and corner material, and the andalusite particles, but also reduces the amount of portland cement added, ensuring the environmental friendliness of the prepared marble rough stone.

[0020] Third, by introducing bentonite and sepiolite with porous structures into the powder and pre-stirring them with the binder, the binder is effectively adsorbed on the surface of bentonite and sepiolite, preventing the binder in the premix from settling, effectively ensuring the bonding force between the raw materials, so that the prepared marble blocks have good bending strength, expanding the application range of marble blocks and improving practicality.

[0021] Fourth, the specific process of curing should be limited. First, the marble blocks should be cooled to room temperature along with the preheated kiln and left to stand for more than 12 hours so that the moisture in the middle of the blank can be slowly discharged to the outside. This prevents the marble blocks from cracking and forming fine lines inside due to direct heating and heat preservation curing, which would affect the strength of the prepared marble blocks. Detailed Implementation

[0022] The present invention will be further described below through specific embodiments.

[0023] A type of marble block produced from marble scrap includes the following raw materials in parts by weight: 50-60 parts marble scrap, 30-40 parts powder, 20-30 parts andalusite particles, 18-22 parts binder, and 25-35 parts water; wherein the andalusite particles have a particle size of 3-5 mm, and the powder has a particle size of 80-100 mesh.

[0024] Specifically, the powder is composed of bentonite, sepiolite powder, and calcite in a weight ratio of 1:1-1.2:1.5-1.6.

[0025] The binder is composed of the following raw materials in parts by weight: 50-60 parts wollastonite powder, 20-30 parts mudstone, 15-22 parts silicate cement, and 15-20 parts attapulgite.

[0026] Its preparation method includes the following steps:

[0027] Step 1: Crush and screen the recycled marble scraps to obtain base material with a particle size of 5-8mm and fine material with a particle size of less than 5mm. Then grind the fine material with a particle size of less than 5mm to obtain fine powder with a particle size of less than 1mm.

[0028] Step 2: First, mix the fine powder obtained in Step 1 with the powder and binder evenly, then add the base material and andalusite particles obtained in Step 1, and continue to mix and stir evenly to obtain the premix.

[0029] Step 3: Pour the mixed premix into the mold, vibrate and spread it evenly, and then send it into the pressing equipment to press and shape it. The pressing equipment has a pressing pressure of 5-6 kg, a vacuum degree of -0.10 MPa, and an amplitude of 0.65 mm.

[0030] Step four: After pressing, demold and cure to obtain the marble block. The specific curing process is as follows: First, send the demolded blank into a kiln preheated to 180-200℃. After the kiln cools to room temperature, place it in the kiln for more than 12 hours. Then, control the kiln to gradually increase the temperature to 115-125℃ at 1.5℃ / min and keep it warm for 5-6 hours. Then, cool it to room temperature with the kiln to complete the curing work.

[0031] Example 1

[0032] A type of marble block produced from marble scrap includes the following raw materials in parts by weight: 50 parts marble scrap, 40 parts powder, 30 parts andalusite particles, 18 parts binder, and 35 parts water; wherein the andalusite particles have a particle size of 3-5 mm, and the powder has a particle size of 80-100 mesh.

[0033] Specifically, the powder is composed of bentonite, sepiolite powder, and calcite in a weight ratio of 1:1:1.5.

[0034] The binder is composed of the following raw materials in parts by weight: 50 parts wollastonite powder, 30 parts mudstone, 22 parts silicate cement, and 15 parts attapulgite clay.

[0035] Its preparation method includes the following steps:

[0036] Step 1: Crush and screen the recycled marble scraps to obtain base material with a particle size of 5-8mm and fine material with a particle size of less than 5mm. Then grind the fine material with a particle size of less than 5mm to obtain fine powder with a particle size of less than 1mm.

[0037] Step 2: First, mix the fine powder obtained in Step 1 with the powder and binder evenly, then add the base material and andalusite particles obtained in Step 1, and continue to mix and stir evenly to obtain the premix.

[0038] Step 3: Pour the mixed premix into the mold, vibrate and spread it evenly, and then send it into the pressing equipment to press and shape it. The pressing equipment has a pressing pressure of 5-6 kg, a vacuum degree of -0.10 MPa, and an amplitude of 0.65 mm.

[0039] Step four: After pressing, demold and cure to obtain the marble block. The specific curing process is as follows: First, send the demolded blank into a kiln preheated to 180℃. After the kiln cools to room temperature, place it in the kiln for more than 12 hours. Then, control the kiln to gradually increase the temperature to 115℃ at 1.5℃ / min and keep it warm for 6 hours. Then, cool it to room temperature with the kiln to complete the curing work.

[0040] Example 2

[0041] A type of marble block produced from marble scrap includes the following raw materials in parts by weight: 60 parts marble scrap, 30 parts powder, 20 parts andalusite particles, 22 parts binder, and 25 parts water; wherein the andalusite particles have a particle size of 3-5 mm, and the powder has a particle size of 80-100 mesh.

[0042] Specifically, the powder is composed of bentonite, sepiolite powder, and calcite in a weight ratio of 1:1.2:1.6.

[0043] The binder is composed of the following raw materials in parts by weight: 60 parts wollastonite powder, 20 parts mudstone, 15 parts silicate cement, and 20 parts attapulgite clay.

[0044] Its preparation method includes the following steps:

[0045] Step 1: Crush and screen the recycled marble scraps to obtain base material with a particle size of 5-8mm and fine material with a particle size of less than 5mm. Then grind the fine material with a particle size of less than 5mm to obtain fine powder with a particle size of less than 1mm.

[0046] Step 2: First, mix the fine powder obtained in Step 1 with the powder and binder evenly, then add the base material and andalusite particles obtained in Step 1, and continue to mix and stir evenly to obtain the premix.

[0047] Step 3: Pour the mixed premix into the mold, vibrate and spread it evenly, and then send it into the pressing equipment to press and shape it. The pressing equipment has a pressing pressure of 5-6 kg, a vacuum degree of -0.10 MPa, and an amplitude of 0.65 mm.

[0048] Step four: After pressing, demold and cure to obtain the marble block. The specific curing process is as follows: First, send the demolded blank into a kiln preheated to 200℃. After the kiln cools to room temperature, place it in the kiln for more than 12 hours. Then, control the kiln to gradually increase the temperature to 125℃ at 1.5℃ / min and keep it warm for 5 hours. Then, cool it to room temperature with the kiln to complete the curing work.

[0049] Example 3

[0050] A type of marble block produced from marble scrap includes the following raw materials in parts by weight: 55 parts marble scrap, 35 parts powder, 25 parts andalusite particles, 20 parts binder, and 30 parts water; wherein the andalusite particles have a particle size of 3-5 mm, and the powder has a particle size of 80-100 mesh.

[0051] Specifically, the powder is composed of bentonite, sepiolite powder, and calcite in a weight ratio of 1:1.1:1.55.

[0052] The binder is composed of the following raw materials in parts by weight: 55 parts wollastonite powder, 25 parts mudstone, 18 parts silicate cement, and 18 parts attapulgite clay.

[0053] Its preparation method includes the following steps:

[0054] Step 1: Crush and screen the recycled marble scraps to obtain base material with a particle size of 5-8mm and fine material with a particle size of less than 5mm. Then grind the fine material with a particle size of less than 5mm to obtain fine powder with a particle size of less than 1mm.

[0055] Step 2: First, mix the fine powder obtained in Step 1 with the powder and binder evenly, then add the base material and andalusite particles obtained in Step 1, and continue to mix and stir evenly to obtain the premix.

[0056] Step 3: Pour the mixed premix into the mold, vibrate and spread it evenly, and then send it into the pressing equipment to press and shape it. The pressing equipment has a pressing pressure of 5-6 kg, a vacuum degree of -0.10 MPa, and an amplitude of 0.65 mm.

[0057] Step four: After pressing, demold and cure to obtain the marble block. The specific curing process is as follows: First, send the demolded blank into a kiln preheated to 190℃. After the kiln cools to room temperature, place it in the kiln for more than 12 hours. Then, control the kiln to gradually increase the temperature to 120℃ at 1.5℃ / min and keep it warm for 5.5 hours. Then, cool it to room temperature with the kiln to complete the curing work.

[0058] Tests were conducted on marble blocks of the same specifications and thickness as those in Examples 1-3, and the following test data were obtained:

[0059] Table 1 Test Data for Each Embodiment

[0060] Test item Test standard Example 1 Example 2 Example 3 Comparative Example 1 Dry compressive strength GB / T 9966.1-2020 31.4 32.8 32.5 26.2 Bending strength GB / T 9966.2-2020 17.5 17.6 18.2 12.5 Water absorption GB / T 9966.3-2020 0.52 0.55 0.5 0.75

[0061] As shown in the table above, the marble blocks prepared in this application have high flexural strength and dry compressive strength. Specifically, by limiting the raw material composition of the marble blocks, high-strength marble scraps with different gradations are combined with andalusite particles as aggregate. Then, powder and binder are used to fill the gaps between the marble scraps and andalusite particles, significantly reducing the porosity inside the obtained marble blocks and ensuring their inherent strength. Furthermore, by introducing porous bentonite and sepiolite into the powder and pre-mixing them with the binder, the binder is effectively adsorbed onto the surfaces of the bentonite and sepiolite, preventing the binder from settling in the premix and effectively ensuring the bonding force between the raw materials. This results in marble blocks with good flexural strength, broadening the application range of marble blocks and improving their practicality.

[0062] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A method for producing marble rough blocks based on marble offcuts, characterized by: The marble rough material comprises the following raw materials by weight: marble corner waste 50-60 parts, powder 30-40 parts, andalusite particles 20-30 parts, binder 18-22 parts, and water 25-35 parts; The preparation method comprises the following steps: Step one, crushing and screening the recycled marble corner waste to obtain base material with a particle size of 5-8 mm and fine material with a particle size of less than 5 mm, and then grinding the fine material with a particle size of less than 5 mm to obtain fine powder with a particle size of less than 1 mm; Step two, mixing the fine powder obtained in step one with the powder and the binder uniformly, then adding the base material obtained in step one and the andalusite particles, and continuing to mix and stir uniformly to obtain a premix; Step three, loading the stirred premix into a mold, oscillating and paving it flat, and then sending it into a pressing device for pressing and forming; Step four, after pressing, demolding, and curing, the marble rough material is obtained; The binder is composed of the following raw materials by weight: wollastonite powder 50-60 parts, mudstone 20-30 parts, silicate cement 15-22 parts, and attapulgite 15-20 parts; The powder is composed of bentonite, sepiolite powder, and calcite in a weight ratio of 1:1-1.2:1.5-1.6; In step four, the curing process is as follows: first, send the demolded blank into a kiln with a preheating temperature of 180-200 DEG C, and after the kiln cooling chamber reaches room temperature, place it in the kiln for 12 hours or more, then gradually increase the temperature of the kiln to 115-125 DEG C at a rate of 1.5 DEG C / min, and then maintain the temperature for 5-6 hours, and then cool the kiln to room temperature, to complete the curing work and obtain the limited marble rough material.

2. A method of producing marble rough blocks from marble offcuts according to claim 1, characterized in that: The particle size of the andalusite particles is 3-5 mm, and the particle size of the powder is 80-100 mesh.

3. A method of producing marble rough blocks from marble offcuts according to claim 1, characterized in that: In step three, the pressing pressure of the pressing device is 5-6 kg, the vacuum degree is -0.10 MP, and the amplitude is 0.65 mm.