CN111153641A - Method for preparing high-strength heat-insulation building block from graphite tailings - Google Patents
Method for preparing high-strength heat-insulation building block from graphite tailings Download PDFInfo
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- CN111153641A CN111153641A CN202010046340.3A CN202010046340A CN111153641A CN 111153641 A CN111153641 A CN 111153641A CN 202010046340 A CN202010046340 A CN 202010046340A CN 111153641 A CN111153641 A CN 111153641A
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- graphite
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- tailing powder
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- graphite tailing
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
- C04B20/06—Expanding clay, perlite, vermiculite or like granular materials
- C04B20/068—Selection of ingredients added before or during the thermal treatment, e.g. expansion promoting agents or particle-coating materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
Abstract
The invention discloses a method for preparing a high-strength heat-insulation building block from graphite tailings, which relates to the technical field of composite materials.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a method for preparing a high-strength heat-insulation building block from graphite tailings.
Background
Graphite is an inorganic non-metallic material essential to the chemical and electrical industries, and plays a significant role in the national defense industry and high-tech products. However, a large amount of graphite tailings are left after the graphite is mined from the graphite ore, and the existing treatment method not only occupies a large amount of land, but also seriously pollutes the ecological environment. With the rapid development of the construction industry, the innovation of wall materials and the requirement of energy conservation of buildings, the heat-insulating wall is widely applied due to the characteristics of the heat-insulating wall, the existing heat-insulating wall is mainly made of cement, sand and lime, and aluminum powder and caustic soda are added to react and foam, so that the manufacturing cost is higher.
Disclosure of Invention
In order to fully utilize the graphite tailings and reduce environmental pollution, the invention provides a method for preparing a high-strength heat-insulation building block from the graphite tailings.
The technical scheme adopted by the invention is as follows: a method for preparing a high-strength heat-insulation building block from graphite tailings comprises the following steps:
s1, placing the graphite tailings in a ball milling device for ball milling and crushing, and sieving with a 250-350-mesh sieve;
s2, placing the graphite tailing powder obtained in the previous step into a vibration magnetic separation bed to separate magnetic substances in the graphite tailing powder, and keeping the non-magnetic graphite tailing powder;
s3, placing the graphite tailing powder reserved in the previous step into a reaction kettle, and adding strong acid liquor to carry out acid washing to remove metals and metal oxides, wherein the acid washing temperature is 80-120 ℃, and the acid washing time is 0.5-2 hours;
s4, cleaning the graphite tailing powder after acid washing to be neutral by using industrial pure water;
s5, placing the cleaned graphite tailing powder in an oven to be baked until the water content is 5-10%, wherein the baking temperature is 100-120 ℃;
s6, placing the graphite tailing powder obtained in the previous step into a high-pressure heating kettle, filling nitrogen for protection, heating to 400-600 ℃, and quickly releasing pressure to obtain expanded graphite tailing powder;
s7, mixing materials, namely mixing and stirring 20-40 parts of expanded graphite tailing powder, 20-40 parts of cement, 20-40 parts of kaolin and 10-40 parts of water;
s8, pouring the mixed material into a mold, vibrating for 10-20 seconds to exhaust, placing the mold in a ventilation environment at 20-30 ℃ for pre-curing for 3-5 hours, demolding, placing the shaped mixed material in a steam environment for curing for 5-10 hours, wherein the steam temperature is 120-180 ℃, and the steam pressure is 0.2-0.8 MPa;
and S9, checking and warehousing.
According to the method for preparing the high-strength heat-insulation building block from the graphite tailings, the strong acid solution in the S3 is a hydrochloric acid solution or a nitric acid solution, and the concentration of the hydrochloric acid solution or the nitric acid solution is 10-20%.
In the method for preparing the high-strength heat-insulation building block from the graphite tailings, the total parts of the expanded graphite tailing powder, the cement and the kaolin in the step S7 are 100 parts, and the water accounts for one half of the cement to be as heavy as the cement.
The method has the beneficial effects that the graphite tailings are subjected to deep pretreatment to remove magnetic components and active metal oxides in the graphite tailings, and the graphite tailings are subjected to swelling treatment to improve the specific surface area of the graphite tailings, so that the strength of the heat-insulation building block is improved, the density of the heat-insulation building block is reduced, and the self weight is reduced.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the present invention is further described below, and it is obvious that the following description is only one embodiment of the present invention, and it will be obvious to those skilled in the art that other embodiments can be obtained according to this embodiment without creative efforts, and all fall within the protection scope of the present invention.
[ example 1 ]
A method for preparing a high-strength heat-insulation building block from graphite tailings comprises the following steps:
s1, placing the graphite tailings in a ball milling device for ball milling and crushing treatment, and sieving the graphite tailings with a 250-mesh sieve;
s2, placing the graphite tailing powder obtained in the previous step into a vibration magnetic separation bed to separate magnetic substances in the graphite tailing powder, and keeping the non-magnetic graphite tailing powder;
s3, placing the graphite tailing powder reserved in the previous step into a reaction kettle, and adding strong acid liquor to carry out acid washing to remove metals and metal oxides, wherein the acid washing temperature is 120 ℃, and the acid washing time is 0.5 h; the concentration of the hydrochloric acid solution or the nitric acid solution is 20%.
S4, cleaning the graphite tailing powder after acid washing to be neutral by using industrial pure water;
s5, placing the graphite tailing powder cleaned in the previous step into an oven to be baked until the water content is 10%, wherein the baking temperature is 100 ℃;
s6, placing the graphite tailing powder obtained in the previous step into a high-pressure heating kettle, filling nitrogen for protection, heating to 600 ℃, and quickly releasing pressure to obtain expanded graphite tailing powder;
s7, mixing materials, namely mixing and stirring 20 parts of expanded graphite tailing powder, 40 parts of cement, 40 parts of kaolin and 20 parts of water.
S8, pouring the mixed material into a mold, vibrating for 10 seconds to exhaust, placing the mold in a ventilation environment at 20-30 ℃ for precuring for 3 hours, demolding, placing the shaped mixed material in a steam environment for curing for 5 hours, wherein the steam temperature is 120 ℃, and the steam pressure is 0.3 MPa;
and S9, checking and warehousing.
[ example 2 ]
A method for preparing a high-strength heat-insulation building block from graphite tailings comprises the following steps:
s1, placing the graphite tailings in a ball milling device for ball milling and crushing treatment, and sieving the graphite tailings with a 300-mesh sieve;
s2, placing the graphite tailing powder obtained in the previous step into a vibration magnetic separation bed to separate magnetic substances in the graphite tailing powder, and keeping the non-magnetic graphite tailing powder;
s3, placing the graphite tailing powder reserved in the previous step into a reaction kettle, adding strong acid liquor for acid washing to remove metals and metal oxides, wherein the acid washing temperature is 100 ℃, and the acid washing time is 1 h; the concentration of the hydrochloric acid solution or the nitric acid solution is 15%.
S4, cleaning the graphite tailing powder after acid washing to be neutral by using industrial pure water;
s5, placing the graphite tailing powder cleaned in the previous step into an oven to be baked until the water content is 10%, wherein the baking temperature is 110 ℃;
s6, placing the graphite tailing powder obtained in the previous step into a high-pressure heating kettle, filling nitrogen for protection, heating to 500 ℃, and quickly releasing pressure to obtain expanded graphite tailing powder;
s7, mixing materials, namely mixing and stirring 40 parts of expanded graphite tailing powder, 20 parts of cement, 40 parts of kaolin and 20 parts of water.
S8, pouring the mixed material into a mold, vibrating for 10 seconds to exhaust, placing the mold in a ventilation environment at 20-30 ℃ for pre-curing for 4 hours, demolding, placing the shaped mixed material in a steam environment for curing for 7 hours, wherein the steam temperature is 160 ℃, and the steam pressure is 0.5 MPa;
and S9, checking and warehousing.
[ example 3 ]
A method for preparing a high-strength heat-insulation building block from graphite tailings comprises the following steps:
s1, placing the graphite tailings in a ball milling device for ball milling and crushing treatment, and sieving with a 350-mesh sieve;
s2, placing the graphite tailing powder obtained in the previous step into a vibration magnetic separation bed to separate magnetic substances in the graphite tailing powder, and keeping the non-magnetic graphite tailing powder;
s3, placing the graphite tailing powder reserved in the previous step into a reaction kettle, adding strong acid liquor for acid washing to remove metals and metal oxides, wherein the acid washing temperature is 80 ℃, and the acid washing time is 1.5 hours; the concentration of the hydrochloric acid solution or the nitric acid solution is 10%.
S4, cleaning the graphite tailing powder after acid washing to be neutral by using industrial pure water;
s5, placing the graphite tailing powder cleaned in the previous step into an oven to be baked until the water content is 5%, wherein the baking temperature is 120 ℃;
s6, placing the graphite tailing powder obtained in the previous step into a high-pressure heating kettle, filling nitrogen for protection, heating to 400 ℃, and quickly releasing pressure to obtain expanded graphite tailing powder;
s7, mixing materials, namely mixing and stirring 40 parts of expanded graphite tailing powder, 40 parts of cement, 20 parts of kaolin and 40 parts of water.
S8, pouring the mixed material into a mold, vibrating for 20 seconds to exhaust, placing the mold in a ventilation environment at 20-30 ℃ for pre-curing for 5 hours, demolding, placing the shaped mixed material in a steam environment for curing for 10 hours, wherein the steam temperature is 180 ℃ and the steam pressure is 0.7 MPa;
and S9, checking and warehousing.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (3)
1. A method for preparing a high-strength heat-insulation building block from graphite tailings is characterized by comprising the following steps:
s1, placing the graphite tailings in a ball milling device for ball milling and crushing, and sieving with a 250-350-mesh sieve;
s2, placing the graphite tailing powder obtained in the previous step into a vibration magnetic separation bed to separate magnetic substances in the graphite tailing powder, and keeping the non-magnetic graphite tailing powder;
s3, placing the graphite tailing powder reserved in the previous step into a reaction kettle, and adding strong acid liquor to carry out acid washing to remove metals and metal oxides, wherein the acid washing temperature is 80-120 ℃, and the acid washing time is 0.5-2 hours;
s4, cleaning the graphite tailing powder after acid washing to be neutral by using industrial pure water;
s5, placing the cleaned graphite tailing powder in an oven to be baked until the water content is 5-10%, wherein the baking temperature is 100-120 ℃;
s6, placing the graphite tailing powder obtained in the previous step into a high-pressure heating kettle, filling nitrogen for protection, heating to 400-600 ℃, and quickly releasing pressure to obtain expanded graphite tailing powder;
s7, mixing materials, namely mixing and stirring 20-40 parts of expanded graphite tailing powder, 20-40 parts of cement, 20-40 parts of kaolin and 10-40 parts of water;
s8, pouring the mixed material into a mold, vibrating for 10-20 seconds to exhaust, placing the mold in a ventilation environment at 20-30 ℃ for pre-curing for 3-5 hours, demolding, placing the shaped mixed material in a steam environment for curing for 5-10 hours, wherein the steam temperature is 120-180 ℃, and the steam pressure is 0.2-0.8 MPa;
and S9, checking and warehousing.
2. The method for preparing the high-strength heat-insulation building block from the graphite tailings as claimed in claim 1, wherein the strong acid solution in the S3 is a hydrochloric acid solution or a nitric acid solution, and the concentration of the hydrochloric acid solution or the nitric acid solution is 10-20%.
3. The method for preparing the high-strength heat-insulation building block from the graphite tailings according to claim 1, wherein the total parts of the expanded graphite tailings powder, the cement and the kaolin in the step S7 are 100 parts, and the water accounts for one half of the cement to the same weight as the cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010046340.3A CN111153641A (en) | 2020-01-16 | 2020-01-16 | Method for preparing high-strength heat-insulation building block from graphite tailings |
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| CN202010046340.3A CN111153641A (en) | 2020-01-16 | 2020-01-16 | Method for preparing high-strength heat-insulation building block from graphite tailings |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875405A (en) * | 2020-06-29 | 2020-11-03 | 沈阳建筑大学 | Graphite tailing foam concrete and preparation method thereof |
| CN115925354A (en) * | 2022-11-23 | 2023-04-07 | 黑龙江大学 | Application of graphite tailing condensate in erosion ditch treatment and waste pit landfill |
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| CN115925354A (en) * | 2022-11-23 | 2023-04-07 | 黑龙江大学 | Application of graphite tailing condensate in erosion ditch treatment and waste pit landfill |
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