CN111807813A - Sand washing mud brick making process - Google Patents
Sand washing mud brick making process Download PDFInfo
- Publication number
- CN111807813A CN111807813A CN202010548483.4A CN202010548483A CN111807813A CN 111807813 A CN111807813 A CN 111807813A CN 202010548483 A CN202010548483 A CN 202010548483A CN 111807813 A CN111807813 A CN 111807813A
- Authority
- CN
- China
- Prior art keywords
- product
- sand washing
- washing mud
- making process
- brick making
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
-
- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1328—Waste materials; Refuse; Residues without additional clay
-
- 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
- C04B33/00—Clay-wares
- C04B33/30—Drying methods
-
- 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
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sand washing mud brick making process, which relates to the field of building aggregate production and comprises a concentration process, a filter pressing process, a batching process, a staleness process, a forming process, a drying process and a firing process. The invention has the beneficial effects that: the invention is beneficial to reducing the discharge of waste such as mud and the like generated in the sand washing production; the invention does not use shale and other raw materials which are required to be mined in the traditional brick making process, thereby saving resources; the pressure during curing and forming is large, which is beneficial to improving the compressive strength, and the compressive strength of the finished product brick can reach more than 30 MPa.
Description
Technical Field
The invention relates to the field of production of building aggregates, in particular to a sand washing mud brick making process.
Background
In the production of sandstone, in order to ensure that the indexes such as mud content and the like meet the relevant standards, sand washing is required, and the produced wastes such as sand washing mud and the like contain minerals such as clay and the like as main components. In the production, the treatment mode of the partial wastes is mainly to discharge into a tailing pond or pile up, and a large amount of land is needed to build the tailing pond or a dumping site, so that the resource waste is caused. The tailing pond or the refuse dump brings potential safety hazards, and accidents such as dam break of the tailing pond, collapse of the refuse dump and the like occur. Therefore, research on a treatment process can improve the problems and the utilization efficiency of resources.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a sand washing mud brick making process, solves the problem of difficult treatment of waste sand washing mud in the production of building aggregate, is favorable for protecting the ecological environment and promotes sustainable development.
The purpose of the invention is achieved by the following technical scheme: the sand washing mud brick making process comprises the following steps:
step one, a concentration process: concentrating and dehydrating the waste sand washing mud in the sandstone production through a concentration and dehydration device to obtain concentrated slurry a;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b;
step three, batching process: mixing the product b obtained in the step two with the raw material c, adding water, and uniformly stirring to obtain a product d;
step four, a staling process: aging the product d obtained in the step three to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step to obtain a green brick g;
step seven, a firing process: and (5) firing the green brick g obtained in the sixth step to obtain a brick h.
As a preferable technical scheme, the concentration and dehydration equipment in the step one is one or two of a thickener and a concentration tank; and 2-50 g of flocculating agent is added into each ton of the concentrated and dehydrated solid according to the weight of the solid; the water content of the slurry a is less than or equal to 55 percent by mass.
As a preferable technical scheme, the water content mass fraction of the product b in the step two is less than or equal to 30 percent.
As a preferred technical scheme, the raw material c in the third step is one or more of mine covering soil, clay, loess, laterite, sandy soil and humus; the water content of the product d is less than or equal to 25 percent.
As a preferable technical scheme, the staling time in the fourth step is 5-48 hours.
As a preferable technical scheme, the curing molding pressure in the step five is more than or equal to 20 MPa.
As a preferable technical scheme, the drying temperature in the step six is more than or equal to 100 ℃, and the drying time is 2-5 hours.
Preferably, the firing temperature in the seventh step is 700-1100 ℃, and the firing time is 5-15 hours.
The invention has the beneficial effects that:
1. the invention is beneficial to reducing the discharge of waste such as mud and the like generated in the sand washing production;
2. the invention does not use shale and other raw materials which are required to be mined in the traditional brick making process, thereby saving resources;
3. the pressure during curing and forming is large, which is beneficial to improving the compressive strength, and the compressive strength of the finished product brick can reach more than 30 MPa.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Detailed Description
The process flow of the invention is shown in figure 1.
Example 1: the sand washing mud brick making process comprises the following steps:
step one, a concentration process: adding 5g of flocculating agent into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 45% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 17% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with the mine covering soil according to the weight ratio of 1:1, adding water, and uniformly stirring to obtain a product d with the water content of 15% by mass;
step four, a staling process: ageing the product d obtained in the step three for 24 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step under the pressure of 20MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 4 hours at the temperature of 200-250 ℃ to obtain a green brick g;
step seven, a firing process: and (4) firing the green brick g obtained in the sixth step for 5 hours at the temperature of 850-980 ℃ to obtain a brick h, wherein the brick h is a finished brick.
Through tests, the h compression strength of the finished brick prepared by the embodiment reaches 32.4 MPa.
Example 2: the sand washing mud brick making process comprises the following steps:
step one, a concentration process: adding 7g of flocculant into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 47% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 18% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with mine covering soil according to the weight ratio of 2:1, adding water, and uniformly stirring to obtain a product d with the water content of 14%;
step four, a staling process: ageing the product d obtained in the step three for 16 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step under the pressure of 25MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 4.5 hours at the temperature of 240-290 ℃ to obtain a raw brick g;
step seven, a firing process: and (4) firing the green brick g obtained in the sixth step for 6 hours at the temperature of 750-830 ℃ to obtain a brick h, wherein the brick h is a finished brick.
Through tests, the h compression strength of the finished brick prepared by the embodiment reaches 35.4 MPa.
Example 3: the sand washing mud brick making process comprises the following steps:
step one, a concentration process: adding 5g of flocculant into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 42% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 19.5% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with the mine covering soil according to the weight ratio of 2.5:1, adding water, and uniformly stirring to obtain a product d containing 17.6% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 48 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step under the pressure of 30MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 3 hours at the temperature of 300-350 ℃ to obtain a green brick g;
step seven, a firing process: and (5) firing the green brick g obtained in the sixth step for 5.5 hours at the temperature of 850-900 ℃ to obtain a brick h, wherein the brick h is a finished brick.
Through tests, the h compression strength of the finished brick prepared by the embodiment reaches 32.7 MPa.
Example 4: the sand washing mud brick making process comprises the following steps:
step one, a concentration process: adding 5g of flocculant into the waste sand washing mud in the sand production per ton according to the solid weight, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 41% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 18.3% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with mine covering soil according to the weight ratio of 3.5:1, adding water, and uniformly stirring to obtain a product d containing 16.2% of water by mass;
step four, a staling process: ageing the product d obtained in the step three for 18 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step under the pressure of 25MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 5 hours at the temperature of 280-330 ℃ to obtain a green brick g;
step seven, a firing process: and firing the green brick g obtained in the sixth step at the temperature of 820-880 ℃ for 6 hours to obtain a brick h, wherein the brick h is a finished brick.
Through tests, the h compression strength of the finished brick prepared by the embodiment reaches 36.3 MPa.
Example 5: the sand washing mud brick making process comprises the following steps:
step one, a concentration process: adding 14g of flocculating agent into the waste sand washing mud in the sand production according to the solid weight per ton, and then concentrating and dehydrating by using a thickener to obtain slurry a containing 43% of water by mass fraction;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b containing 17.7% of water by mass fraction;
step three, batching process: mixing the product b obtained in the step two with mine covering soil according to the weight ratio of 1:2, adding water, and uniformly stirring to obtain a product d with the water content of 13%;
step four, a staling process: ageing the product d obtained in the step three for 30 hours to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step under the pressure of 25MPa to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step for 4.5 hours at the temperature of 300-350 ℃ to obtain a raw brick g;
step seven, a firing process: and (4) firing the green brick g obtained in the sixth step for 5.5 hours at the temperature of 780-850 ℃ to obtain a brick h, wherein the brick h is a finished brick.
Through tests, the h compression strength of the finished brick prepared by the embodiment reaches 34.2 MPa.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.
Claims (8)
1. A sand washing mud brick making process is characterized in that: the method comprises the following steps:
step one, a concentration process: concentrating and dehydrating the waste sand washing mud in the sandstone production through a concentration and dehydration device to obtain concentrated slurry a;
step two, a filter pressing process: carrying out filter pressing on the slurry a obtained in the step one to obtain a product b;
step three, batching process: mixing the product b obtained in the step two with the raw material c, adding water, and uniformly stirring to obtain a product d;
step four, a staling process: aging the product d obtained in the step three to obtain a product e;
step five, a forming procedure: curing and molding the product e obtained in the fourth step to obtain a blank body f;
step six, a drying procedure: drying the blank f obtained in the fifth step to obtain a green brick g;
step seven, a firing process: and (5) firing the green brick g obtained in the sixth step to obtain a brick h.
2. The sand washing mud brick making process according to claim 1, characterized in that: the concentration and dehydration equipment in the step one is one or two of a thickener and a concentration tank; and 2-50 g of flocculating agent is added into each ton of the concentrated and dehydrated solid according to the weight of the solid; the water content of the slurry a is less than or equal to 55 percent by mass.
3. The sand washing mud brick making process according to claim 1, characterized in that: the water content mass fraction of the product b in the step two is less than or equal to 30 percent.
4. The sand washing mud brick making process according to claim 1, characterized in that: the raw material c in the third step is one or more of mine covering soil, clay, loess, laterite, sandy soil and humus; the mass fraction of water contained in the product d is less than or equal to 25 percent.
5. The sand washing mud brick making process according to claim 1, characterized in that: and the staling time in the fourth step is 5-48 hours.
6. The sand washing mud brick making process according to claim 1, characterized in that: and the molding pressure in the fifth step is more than or equal to 20 MPa.
7. The sand washing mud brick making process according to claim 1, characterized in that: and sixthly, drying at the temperature of more than or equal to 100 ℃ for 2-5 hours.
8. The sand washing mud brick making process according to claim 1, characterized in that: and seventhly, the firing temperature is 700-1100 ℃, and the firing time is 5-15 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010548483.4A CN111807813A (en) | 2020-06-16 | 2020-06-16 | Sand washing mud brick making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010548483.4A CN111807813A (en) | 2020-06-16 | 2020-06-16 | Sand washing mud brick making process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111807813A true CN111807813A (en) | 2020-10-23 |
Family
ID=72845089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010548483.4A Pending CN111807813A (en) | 2020-06-16 | 2020-06-16 | Sand washing mud brick making process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111807813A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3886245A (en) * | 1970-12-22 | 1975-05-27 | Giulini Gmbh Geb | Method for producing bricks from red mud |
| JP2002086121A (en) * | 2000-09-13 | 2002-03-26 | Nisshin Steel Co Ltd | Method of treating steel making slag and sand-washing sludge |
| CN110078530A (en) * | 2019-05-05 | 2019-08-02 | 东南大学 | A kind of preparation method of high performance sintered insulating brick |
| CN110642637A (en) * | 2019-11-20 | 2020-01-03 | 浙江寰龙环境科技有限公司 | Ceramsite prepared from sand washing sludge and municipal sludge and preparation method thereof |
| CN110922074A (en) * | 2019-12-27 | 2020-03-27 | 大冶尖峰水泥有限公司 | Method for treating sludge of machine-made sand factory |
| CN110981296A (en) * | 2019-11-28 | 2020-04-10 | 上海智平基础工程有限公司 | Pressing method brick making process for building waste mud |
| CN111004012A (en) * | 2019-11-28 | 2020-04-14 | 上海智平基础工程有限公司 | Sintering method brick making process for building waste slurry |
| CN111018559A (en) * | 2019-12-23 | 2020-04-17 | 湘潭市格物节能建材有限公司 | Light high-strength ceramsite and preparation method thereof |
-
2020
- 2020-06-16 CN CN202010548483.4A patent/CN111807813A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3886245A (en) * | 1970-12-22 | 1975-05-27 | Giulini Gmbh Geb | Method for producing bricks from red mud |
| JP2002086121A (en) * | 2000-09-13 | 2002-03-26 | Nisshin Steel Co Ltd | Method of treating steel making slag and sand-washing sludge |
| CN110078530A (en) * | 2019-05-05 | 2019-08-02 | 东南大学 | A kind of preparation method of high performance sintered insulating brick |
| CN110642637A (en) * | 2019-11-20 | 2020-01-03 | 浙江寰龙环境科技有限公司 | Ceramsite prepared from sand washing sludge and municipal sludge and preparation method thereof |
| CN110981296A (en) * | 2019-11-28 | 2020-04-10 | 上海智平基础工程有限公司 | Pressing method brick making process for building waste mud |
| CN111004012A (en) * | 2019-11-28 | 2020-04-14 | 上海智平基础工程有限公司 | Sintering method brick making process for building waste slurry |
| CN111018559A (en) * | 2019-12-23 | 2020-04-17 | 湘潭市格物节能建材有限公司 | Light high-strength ceramsite and preparation method thereof |
| CN110922074A (en) * | 2019-12-27 | 2020-03-27 | 大冶尖峰水泥有限公司 | Method for treating sludge of machine-made sand factory |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101608483B (en) | Phosphogypsum composite autoclaved brick and preparation method thereof | |
| CN112321254B (en) | Controllable low-strength material using titanium gypsum and engineering waste soil and preparation method thereof | |
| CN105622023B (en) | A kind of sludge curing agent using clinker | |
| CN104177015A (en) | Baking-free brick mainly prepared from river/lake dredging sediment and natural-curing manufacturing method thereof | |
| CN111807815A (en) | Building residue soil brick making and sand and stone process | |
| CN104276809A (en) | Abrasion-proof hollow brick containing purple sand shale | |
| CN108424047B (en) | Red mud-based rapid-setting grouting material suitable for grouting reinforcement and treatment of sandy soil stratum | |
| CN101912866B (en) | Iron tailing solidifying method | |
| CN108409215B (en) | Ductile sludge geopolymer and preparation method thereof | |
| CN103193424A (en) | Method for producing pervious concrete through comprehensive utilization of coal gangues | |
| CN108467234B (en) | Rock mass fracture grouting material prepared from cement stone phase and preparation method | |
| CN111777406A (en) | Process for preparing sintered heat-insulation building blocks from sand washing mud | |
| CN115093181B (en) | High-strength baking-free brick based on shield muck in loess region and preparation method thereof | |
| CN111807813A (en) | Sand washing mud brick making process | |
| CN108675709B (en) | Method for preparing slope protection brick by utilizing soil after thermal desorption remediation and product thereof | |
| CN114853415B (en) | Method for preparing baking-free pressed brick by ball milling activated shield slurry and product thereof | |
| CN111673897A (en) | Process for making bricks and gravels in weathered layer of mine | |
| CN107602026B (en) | Non-sintered water permeable brick and preparation method thereof | |
| CN116102270A (en) | Preparation method of novel cementing material produced by utilizing granite mine solid waste | |
| CN115142578A (en) | Iron tailing and glutinous rice modified rammed earth wall and preparation method thereof | |
| CN111548065B (en) | Dry-mixed mortar prepared from sludge waste residues and preparation method thereof | |
| CN104310896B (en) | A kind of air-entrained concrete building block and preparation method thereof | |
| CN101767979A (en) | Rare earth residue sludge sintering agent | |
| CN111777404A (en) | Filter cake brick making process | |
| CN105669142A (en) | Method for producing urban comprehensive pipe rack concrete culvert pipe by utilizing molybdenum tailings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201023 |
|
| RJ01 | Rejection of invention patent application after publication |