CN112265997A - Treatment method and process of rock wool waste - Google Patents
Treatment method and process of rock wool waste Download PDFInfo
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- CN112265997A CN112265997A CN202011064952.1A CN202011064952A CN112265997A CN 112265997 A CN112265997 A CN 112265997A CN 202011064952 A CN202011064952 A CN 202011064952A CN 112265997 A CN112265997 A CN 112265997A
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- rock wool
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/157—After-treatment of gels
- C01B33/158—Purification; Drying; Dehydrating
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/96—Methods for the preparation of sulfates in general
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/48—Methods for the preparation of nitrates in general
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/152—Preparation of hydrogels
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a treatment method and a treatment process of rock wool waste, and belongs to the technical field of rock wool waste treatment. The method comprises the following steps: 1. drying and crushing; 2. standing for gelation; 3. aging and crushing; 4. washing with water; 5. and (5) drying. According to the invention, rock wool waste is reacted with the acid catalyst, so that not only is the rock wool waste decomposed, but also silicon dioxide particles or powder are prepared, and the rock wool waste is recycled and changed into valuable.
Description
Technical Field
The invention relates to a treatment method and a treatment process of rock wool waste, and belongs to the technical field of rock wool waste treatment.
Background
Rock wool manufacturing enterprise inevitably can produce more cotton waste in the production process, include: waste cotton boards, waste cotton felts, waste pipe sleeves, broken cotton produced by cutting of a production line, and a dust remover collect waste rock wool waste and the like. Because rock wool is fluffy and difficult to degrade, the open-air accumulation of the rock wool not only occupies a large space, but also pollutes the environment, so that deep burying treatment is usually selected, but not only is the manpower and the transport capacity wasted, but also great environmental pressure is faced.
At present, waste rock wool generated in the rock wool production process is processed through equipment such as a screw extrusion shearing machine, a drying machine and a shearing machine, and a foaming insulation board is prepared by adding cement and gypsum powder, but a more specific technical scheme is not provided for how to process the rock wool in the industry. In addition, the publication "application of rock wool chips in vitrified microbead thermal insulation mortar" discusses that rock wool leftovers are crushed into vitreous rock wool chips, and the vitreous rock wool chips are added into cement and stirred to prepare thermal insulation mortar. In addition, the prior art is still relatively lacked in the comprehensive utilization of rock wool.
Therefore, how to effectively treat and recycle the waste cotton has important significance.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a treatment method and a treatment process of rock wool waste.
A treatment method and a process for rock wool waste are characterized in that: the method comprises the following steps:
1. drying and crushing
Drying rock wool at the temperature of 50-120 ℃, and then crushing to obtain rock wool powder, particles or blocks;
the rock wool is rock wool discarded object, specifically does: waste rock wool felt, plates, pipe sleeves, broken cotton generated by cutting of a production line and waste cotton collected by a dust remover;
the crushing treatment is manual crushing, mechanical crushing, airflow crushing or ultrasonic crushing;
2. standing gel
Uniformly mixing the rock wool powder, the particles or the blocks obtained in the step (1) with a catalyst and water, stirring at the normal temperature and the normal pressure at the speed of 100-500 r/min for 5-120 minutes, and sealing and standing for gelation after the rock wool powder, the particles or the blocks are completely dissolved;
the catalyst is an acidic catalyst, any one or more of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and oxalic acid is adopted, and after the catalyst is mixed with water, 0.1-10 mol/L acidic catalyst solution is obtained;
the rock wool powder, the particles or the blocks are dissolved in 1-200 parts by weight of catalyst solution according to 1-100 parts by weight;
3. aging and crushing
Aging the gel obtained in the step (2) at room temperature to 80 ℃ for 2-12 h, and then crushing to form granular or powdery wet gel;
the crushing treatment is manual crushing, mechanical crushing, airflow crushing or ultrasonic crushing;
4. washing treatment
Washing the granular or powdery wet gel obtained in the step (3) with water, specifically washing with water 5-20 times the volume of the wet gel for 1-5 times, removing impurity metal salts, and filtering to obtain pure hydrogel;
the water washing is heating stirring water washing, the stirring speed is 10-300 r/min, the stirring temperature is room temperature-90 ℃, the stirring time is 1-6 h, and the water is selected from deionized water and tap water;
the impurities are any one or more of sodium salt, calcium salt, ferric salt, magnesium salt, potassium salt and aluminum salt, and the aqueous solution of the metal salt is evaporated and precipitated to obtain some chemical coarse materials;
5. drying treatment
Drying the hydrogel obtained in the step (4) to obtain silicon dioxide powder or particles;
the drying mode is any one of rotary drying, spray drying or forced air drying.
The method adopts the reaction and decomposition mode of the rock wool and the acid catalyst to treat the rock wool waste, saves a large amount of manpower and material resources compared with the traditional treatment mode which takes burying as the main mode, avoids the damage to the environment, changes the rock wool waste into valuable, prepares silicon dioxide particles and some chemical coarse materials, and relatively presses the rock wool waste into blocks and returns the blocks to the furnace to prepare mortar, thereby solving the problems fundamentally.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The treatment method and the treatment process for rock wool waste comprise the following steps:
1. drying rock wool at the temperature of 60 ℃, and then mechanically crushing to obtain a rock wool block body;
2. uniformly mixing 30 parts of rock wool blocks and 100 parts of 4mol/L hydrochloric acid solution, stirring at the normal temperature and the normal pressure at the speed of 300r/min for 30 minutes, and then sealing and standing for gelation;
3. aging the wet gel obtained in the step 2 at 80 ℃ for 2h, and then carrying out artificial crushing treatment to form wet gel powder;
4. adding the wet gel powder obtained in the step (3) into deionized water, stirring at the speed of 100r/min for 4h at the temperature of 50 ℃, washing with water with the volume 5 times that of the wet gel each time for 5 times, and filtering to obtain pure hydrogel;
5. drying the hydrogel obtained in the step 4 in an air drying oven at 200 ℃ for 2h to obtain silicon dioxide powder;
6. and (4) precipitating and evaporating the aqueous solution of the impurity metal salt obtained in the step (4) to obtain chemical coarse materials of chloride salt.
Example 2
The treatment method and the treatment process for rock wool waste comprise the following steps:
1. drying rock wool at the temperature of 80 ℃, and then mechanically crushing to obtain rock wool particles;
2. uniformly mixing 50 parts of rock wool particles and 100 parts of 3mol/L sulfuric acid solution, stirring at normal temperature and normal pressure at the speed of 300r/min for 40 minutes, and then sealing and standing for gelation;
3. aging the wet gel obtained in the step 2 for 12h at room temperature, and then performing mechanical crushing treatment to generate wet gel powder;
4. adding tap water into the wet gel obtained in the step (3), stirring at the room temperature at the speed of 200r/min for 4h, washing with water with the volume of 5 times that of the wet gel for 5 times, and filtering to obtain pure hydrogel;
5. drying the hydrogel obtained in the step 4 for 2 hours at 200 ℃ by adopting a rotary dryer to obtain silicon dioxide powder;
6. and (4) precipitating and evaporating the aqueous solution of the impurity metal salt obtained in the step (4) to obtain chemical coarse materials of some sulfate.
Example 3
The treatment method and the treatment process for rock wool waste comprise the following steps:
1. drying rock wool at 120 ℃, and then mechanically crushing to obtain rock wool fiber powder;
2. uniformly mixing 40 parts of rock wool particles and 80 parts of 1mol/L sulfuric acid solution, stirring at normal temperature and normal pressure at the speed of 300r/min for 50 minutes, and then sealing and standing for gelation;
3. aging the wet gel obtained in the step 2 at 50 ℃ for 6h, and then carrying out ultrasonic crushing treatment to generate wet gel powder;
4. adding tap water into the wet gel obtained in the step (3), stirring at the room temperature at the speed of 300r/min for 2h, washing with water with the volume of 5 times that of the wet gel for 5 times, and filtering to obtain pure hydrogel;
5. spray drying the hydrogel obtained in the step 4 at 200 ℃ to obtain silicon dioxide powder;
6. and (4) precipitating and evaporating the aqueous solution of the impurity metal salt obtained in the step (4) to obtain some nitrate chemical coarse materials.
Principle analysis: the rock wool waste mainly comprises silicon dioxide, aluminum oxide, calcium oxide, iron oxide, magnesium oxide, potassium oxide, sodium oxide and the like, wherein the content of the silicon dioxide is 40-42% at most, the silicon dioxide mainly exists in a silicate form, the silicon dioxide gel is easily reacted with an acid catalyst to generate silicic acid gel, and the silicon dioxide is generated after the gel is dried. The rock wool waste becomes more easily broken after drying to remove water, so that the reaction of the formed rock wool powder or granular rock wool with the acid catalyst can be rapidly carried out, and the gel reaction is carried out to generate wet gel. The internal crosslinking polycondensation is still proceeding after the wet gel is formed, and therefore, aging is required under a certain environment. Then crushing, heating, stirring and washing to dissolve metal impurity salt generated by the reaction of the metal oxide and the acidic catalyst in the wet gel in water, so that the wet gel becomes pure hydrogel, the hydrogel is dried to obtain silicon dioxide particles, and the aqueous solution of the impurity metal salt is evaporated and precipitated to obtain some chemical coarse materials.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A treatment method and a process for rock wool waste are characterized by comprising the following steps:
1) drying and crushing
Drying rock wool at the temperature of 50-120 ℃, and then crushing to obtain rock wool powder, particles or blocks;
2) gel after standing
Uniformly mixing the rock wool powder, the particles or the blocks obtained in the step (1) with a catalyst and water, stirring at the normal temperature and the normal pressure at the speed of 100-500 r/min for 5-120 minutes, and then sealing and standing for gelation;
3) aging and crushing
Aging the gel obtained in the step (2) at room temperature to 80 ℃ for 2-12 h, and then crushing to form wet gel in the form of particles or powder;
4) washing with water
Washing the granular or powdery wet gel obtained in the step (3) with water, specifically washing with water 5-20 times the volume of the wet gel for 1-5 times, removing impurity metal salts, and filtering to obtain pure hydrogel;
5) drying the mixture
And (4) drying the hydrogel obtained in the step (4) to obtain silicon dioxide powder or particles.
2. The treatment method and the process for rock wool waste according to claim 1, wherein the rock wool in the step 1) is rock wool waste, and specifically comprises the following steps: waste rock wool felt, plates, pipe sleeves, broken cotton produced by cutting of a production line and waste slag cotton collected by a dust remover.
3. The method and the process for treating rock wool waste according to claim 1, wherein the crushing treatment in the step 1) and the step 3) is manual crushing, mechanical crushing, airflow crushing or ultrasonic crushing.
4. The method and the process for treating rock wool waste according to claim 1, wherein the catalyst in the step 2) is an acidic catalyst, and the acidic catalyst is any one or more of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and oxalic acid, and is mixed with water to obtain 0.1-10 mol/L acidic catalyst solution.
5. The method and process for treating rock wool waste according to claim 1, wherein the rock wool powder, particles or blocks in step 2) are dissolved in 1-200 parts by weight of the catalyst solution in an amount of 1-100 parts by weight.
6. The treatment method and the process for rock wool waste according to claim 1, wherein the washing in the step 4) is heating stirring washing, the stirring speed is 10-300 r/min, the stirring temperature is 0-90 ℃, the stirring time is 1-6 h, and the water is selected from deionized water and tap water.
7. The method and process according to claim 1, wherein the impurities in step 4) are any one or more of sodium salt, calcium salt, iron salt, magnesium salt, potassium salt and aluminum salt, and the aqueous solution of the metal salt is evaporated and precipitated to obtain the chemical coarse material.
8. The method and the process for treating rock wool waste according to claim 1, wherein the drying manner in the step 5) is any one of rotary drying, spray drying or forced air drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064952.1A CN112265997A (en) | 2020-09-30 | 2020-09-30 | Treatment method and process of rock wool waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064952.1A CN112265997A (en) | 2020-09-30 | 2020-09-30 | Treatment method and process of rock wool waste |
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| Publication Number | Publication Date |
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| CN112265997A true CN112265997A (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011064952.1A Pending CN112265997A (en) | 2020-09-30 | 2020-09-30 | Treatment method and process of rock wool waste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023025134A1 (en) * | 2021-08-25 | 2023-03-02 | 中建三局绿色产业投资有限公司 | Method for activating waste rock wool and use of activated waste rock wool |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040011246A1 (en) * | 2000-06-20 | 2004-01-22 | Michael Perander | Colloidal silicate dispersion, method for its preparation and its use |
| CN104030304A (en) * | 2014-06-27 | 2014-09-10 | 西南科技大学 | Method for preparing fibrous porous SiO2 nanometer material |
| CN104030328A (en) * | 2014-06-27 | 2014-09-10 | 西南科技大学 | Method for extracting magnesium oxide and preparing active porous silicon dioxide material by using serpentine |
-
2020
- 2020-09-30 CN CN202011064952.1A patent/CN112265997A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040011246A1 (en) * | 2000-06-20 | 2004-01-22 | Michael Perander | Colloidal silicate dispersion, method for its preparation and its use |
| CN104030304A (en) * | 2014-06-27 | 2014-09-10 | 西南科技大学 | Method for preparing fibrous porous SiO2 nanometer material |
| CN104030328A (en) * | 2014-06-27 | 2014-09-10 | 西南科技大学 | Method for extracting magnesium oxide and preparing active porous silicon dioxide material by using serpentine |
Non-Patent Citations (2)
| Title |
|---|
| 化学工业部天津化工研究院等编: "《化工产品手册 无机化工产品（第二版）》", 31 October 1993 * |
| 李世青 等: "采用蛇纹石石棉制备纳米纤维白炭黑", 《中国粉体技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023025134A1 (en) * | 2021-08-25 | 2023-03-02 | 中建三局绿色产业投资有限公司 | Method for activating waste rock wool and use of activated waste rock wool |
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Address after: 264006 No. 6 Taiyuan Road, Yantai economic and Technological Development Zone, Shandong 6 Applicant after: Wanhua Construction Technology Co.,Ltd. Applicant after: WANHUA ENERGY-SAVING TECHNOLOGY GROUP Co.,Ltd. Address before: 264006 No. 6 Taiyuan Road, Yantai economic and Technological Development Zone, Shandong 6 Applicant before: WANHUA BUILDING TECHNOLOGY (YANTAI) Co.,Ltd. Applicant before: WANHUA ENERGY-SAVING TECHNOLOGY GROUP Co.,Ltd. |
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Application publication date: 20210126 |
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