CN111906244A - Process for casting molding sand by using coal gangue - Google Patents
Process for casting molding sand by using coal gangue Download PDFInfo
- Publication number
- CN111906244A CN111906244A CN202010820681.1A CN202010820681A CN111906244A CN 111906244 A CN111906244 A CN 111906244A CN 202010820681 A CN202010820681 A CN 202010820681A CN 111906244 A CN111906244 A CN 111906244A
- Authority
- CN
- China
- Prior art keywords
- coal gangue
- molding sand
- particles
- casting molding
- starch
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/167—Mixtures of inorganic and organic binding agents
Abstract
The invention discloses a process for casting molding sand by using coal gangue, which comprises the steps of soaking the coal gangue in water and calcining; conveying the calcined coal gangue to a fine crushing jaw crusher for primary crushing, and then performing secondary fine crushing by adopting a hammer crusher to obtain coal gangue particles; uniformly mixing and stirring calamine particles, feldspar particles and coal gangue particles, then sequentially adding diatomite, starch, epoxy resin and water glass, and uniformly stirring again to obtain a mixture; covering the mixture with plastic cloth having air holes, and blowing CO into the mixture2And obtaining the coal gangue molding sand. The process for casting the molding sand by using the coal gangue takes the coal gangue as a main frame, the preparation method can effectively improve the thermal stability, the air permeability and the mechanical strength of the molding sand, and meanwhile, the process has the advantages of easily available raw materials, simple steps and excellent industrialization prospect.
Description
Technical Field
The invention relates to the field of molding sand casting, in particular to a process for casting molding sand by using coal gangue.
Background
The coal gangue is the rock associated with coal, is the solid waste separated in the coal mining and washing process, is a mixture of various ore rocks, and belongs to sedimentary rock. The coal gangue is regarded as industrial garbage from ancient times and is not utilized on a large scale all the time, and the coal gangue is the industrial waste with the largest discharge amount at present and accounts for 10% -15% of the coal yield. 1500 more coal gangue piles are accumulated in China at present, the total amount of coal gangue is about 40 hundred million tons, and the occupied land is about 16000hm2The land occupation is increased by 1.5-2.0 hundred million tons every year, and the newly increased land occupation is 400hm every year2. The coal industry invests coal gangue disposal cost about 1 million yuan each year. The accumulation of the coal gangue not only occupies a large amount of land, but also pollutes atmosphere and water source after sulfides contained in the coal gangue are emitted, thereby causing serious consequences; pyrite contained in the coal gangue is easy to be oxidized by air, and the released heat can promote the coal contained in the coal gangue to be weathered to be spontaneous combustion, and emit unpleasant odor and harmful smoke, so that the number of patients suffering from chronic tracheitis and asthma of nearby residents is increased; the falling leaves of surrounding trees and the yield reduction of crops; the coal gangue dump is washed by rain water, so that nearby river beds are often silted, and river water is polluted. Therefore, comprehensive utilization of the coal gangue is vigorously developed, the environment is protected, pollution is treated, and the method is very urgent.
The molding sand can be divided into surface sand, filling sand, single sand and the like. The facing sand is a layer of molding sand tightly attached to a casting, and the quality requirement is high. The filled sand is not contacted with molten metal after being arranged on the surface sand layer, and the quality requirement is not strict. The single sand is molding sand without surface sand and back sand, and is mainly used for machine molding. In addition, the sand mold of the large casting is usually dried and then poured, and the used molding sand contains more clay, which is called dry mold sand; the molding sand used by the wet-type pouring method is less in clay content and is called wet-type sand.
In the present day that the environment is increasingly worsened and natural resources tend to be poor, for countries such as China with numerous population and serious shortage of natural resources, sustainable development strategy that economic development is coordinated with population, resources and environment must be adhered to, coal gangue seems like waste and is a potential huge resource, data reports exist, the total utilization rate of coal gangue in western countries such as America, British, Germany and the like reaches more than 90%, and remarkable benefits are obtained
Therefore, the technical problem to be solved by the technical personnel in the field is to provide a process for casting molding sand by using coal gangue.
Disclosure of Invention
In view of the above, the present invention provides a process for casting molding sand by using coal gangue, so as to improve the thermal stability, air permeability and mechanical strength of the molding sand.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for casting molding sand by using coal gangue comprises the following steps:
(1) soaking the coal gangue in water for 8-12h, and calcining;
(2) conveying the calcined coal gangue to a crusher for primary crushing, and then performing secondary fine crushing by using the crusher to obtain coal gangue particles;
(3) weighing calamine and feldspar, and crushing for later use;
(4) uniformly mixing and stirring calamine particles, feldspar particles and coal gangue particles, then sequentially adding diatomite, starch, epoxy resin and water glass, and uniformly stirring again to obtain a mixture;
(5) covering the mixture with plastic cloth with air holes, and blowing CO into the mixture through the air holes after 12-24 hr2And then uncovering the plastic cloth to obtain the coal gangue molding sand.
Further, the raw materials in parts by weight are as follows: 100-150 parts of coal gangue, 15-20 parts of calamine, 3-8 parts of feldspar, 5-15 parts of water glass, 15-20 parts of diatomite, 5-10 parts of epoxy resin and 10-12 parts of starch.
Furthermore, the starch is one or more of wheat starch, tapioca flour and mung bean starch.
Adopt above-mentioned further beneficial effect to lie in: the raw materials defined by the invention take the coal gangue as a basic skeleton, are compounded with the epoxy resin and the water glass, and are added with the starch and other raw materials, so that various comprehensive properties of the prepared molding sand can be further improved, particularly the fire resistance, the air permeability and the mechanical strength of the molding sand.
Furthermore, the calcination temperature in the step (1) is 1500-.
Adopt above-mentioned further beneficial effect to lie in: according to the invention, gaps among the coal gangue can be reduced by calcining the coal gangue, the quality of the coal gangue is improved, and the crystallized water and ash content in the coal gangue are removed in the calcining process, so that the mechanical strength of the molding sand is improved.
Further, the crushing granularity of the coal gangue particles in the step (2) is 200-300 meshes, a fine jaw crusher is adopted for primary crushing, and a hammer crusher is adopted for secondary crushing; the crushing particle sizes of the calamine and the feldspar in the step (3) are both 150-250 meshes.
Adopt above-mentioned further beneficial effect to lie in: according to the invention, the coal gangue, the calamine and the feldspar are crushed, so that the raw materials are mixed more uniformly, and the fire resistance and the air permeability of the molding sand are improved.
Further, the stirring speed of the two times in the step (4) is 70-95r/min, and the stirring time is 10-20 min.
Further, 4-6 air holes are arranged in each square meter of the plastic cloth provided with the air holes in the step (5).
Further, each pore CO in the step (5)2The blowing amount of the air is 15-20m3The air blowing time is 2-3 min; carrying out CO2When blowing, 1-2 air holes are reserved in each square meter as air outlet holes.
Adopt above-mentioned further beneficial effect to lie in: the invention adopts the plastic cloth for covering and then blowing, so that the molding sand can be quickly hardened, and the mechanical strength of the molding sand is further improved.
The invention has the beneficial effects that: the process for casting the molding sand by using the coal gangue takes the coal gangue as a main frame, simultaneously water glass and epoxy resin are matched as binders, and then auxiliary materials such as starch, diatomite, calamine and the like are compounded to prepare the molding sand.
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
A process for casting molding sand by using coal gangue comprises the following steps:
(1) weighing 100kg of coal gangue, 15kg of calamine, 8kg of feldspar, 15kg of water glass, 15kg of diatomite, 10kg of epoxy resin and 12kg of wheat starch.
(2) After soaking the coal gangue in water for 12 hours, calcining the coal gangue for 2 hours at 1700 ℃;
(3) conveying the calcined coal gangue to a fine crushing jaw crusher for primary crushing, and then performing secondary fine crushing by adopting a hammer crusher to obtain coal gangue particles of 200 meshes;
(4) weighing calamine and feldspar, pulverizing to 250 meshes for later use
(5) Mixing calamine particles, feldspar particles and coal gangue particles, stirring for 20min at 70r/min, then sequentially adding diatomite, starch, epoxy resin and water glass, and stirring for 20min at 70r/min to obtain a mixture;
(6) covering the mixture with plastic cloth with 6 pores per square meter, and blowing CO into the mixture via the pores 12 hr later2Each pore CO2The blowing amount of (2) is 15m3And blowing for 2min, reserving 2 air holes as air outlet holes in each square meter of plastic cloth, and then uncovering the plastic cloth to obtain the coal gangue molding sand.
Example 2
A process for casting molding sand by using coal gangue comprises the following steps:
(1) weighing 150kg of coal gangue, 20kg of calamine, 3kg of feldspar, 5kg of water glass, 20kg of diatomite, 5kg of epoxy resin and 10kg of cassava powder.
(2) After soaking the coal gangue in water for 8 hours, calcining the coal gangue for 4 hours at 1500 ℃;
(3) conveying the calcined coal gangue to a fine crushing jaw crusher for primary crushing, and then performing secondary fine crushing by adopting a hammer crusher to obtain 300-mesh coal gangue particles;
(4) weighing calamine and feldspar, and crushing to 150 meshes for later use;
(5) mixing calamine particles, feldspar particles and coal gangue particles, stirring for 20min at 95r/min, then sequentially adding diatomite, starch, epoxy resin and water glass, and stirring for 20min at 95r/min to obtain a mixture;
(6) covering the mixture with plastic cloth with 4 pores per square meter, and blowing CO into the mixture via the pores after 24 hr2Each pore CO2The blowing amount of (2) is 15m3And blowing for 3min, reserving 1 air hole per square meter of plastic cloth as an air outlet, and then uncovering the plastic cloth to obtain the coal gangue molding sand.
Example 3
A process for casting molding sand by using coal gangue comprises the following steps:
(1) weighing 125kg of coal gangue, 18kg of calamine, 5kg of feldspar, 12kg of water glass, 18kg of diatomite, 7kg of epoxy resin, 6kg of wheat starch and 6kg of mung bean starch.
(2) After soaking the coal gangue in water for 10 hours, calcining the coal gangue for 3 hours at 1600 ℃;
(3) conveying the calcined coal gangue to a fine crushing jaw crusher for primary crushing, and then performing secondary fine crushing by adopting a hammer crusher to obtain 250-mesh coal gangue particles;
(4) weighing calamine and feldspar, and crushing to 200 meshes for later use;
(5) mixing calamine particles, feldspar particles and coal gangue particles, stirring for 15min at 80r/min, then sequentially adding diatomite, starch, epoxy resin and water glass, and stirring for 15min at 80r/min to obtain a mixture;
(6) covering the mixture with plastic cloth having 5 pores per square meter, and blowing CO into the mixture via the pores after 18 hr2Each pore CO2The blowing amount of (2) is 18m3And blowing for 2min, reserving 1 air hole per square meter of plastic cloth as an air outlet, and then uncovering the plastic cloth to obtain the coal gangue molding sand.
Example 4
A process for casting molding sand by using coal gangue comprises the following steps:
(1) weighing 110kg of coal gangue, 17kg of calamine, 7kg of feldspar, 10kg of water glass, 15kg of diatomite, 9kg of epoxy resin and 10kg of cassava powder.
(2) After soaking the coal gangue in water for 9 hours, calcining the coal gangue for 3 hours at 1600 ℃;
(3) conveying the calcined coal gangue to a fine crushing jaw crusher for primary crushing, and then performing secondary fine crushing by adopting a hammer crusher to obtain 300-mesh coal gangue particles;
(4) weighing calamine and feldspar, and crushing to 150 meshes for later use;
(5) mixing calamine particles, feldspar particles and coal gangue particles, stirring at 90r/min for 12min, then sequentially adding diatomite, starch, epoxy resin and water glass, and stirring at 85r/min for 16min again to obtain a mixture;
(6) covering the mixture with plastic cloth with 6 pores per square meter, and blowing CO into the mixture through the pores after 20 hr2Each pore CO2The blowing amount of (2)0m3And blowing for 3min, reserving 2 air holes as air outlet holes in each square meter of plastic cloth, and then uncovering the plastic cloth to obtain the coal gangue molding sand.
Example 5
A process for casting molding sand by using coal gangue comprises the following steps:
(1) weighing 140kg of coal gangue, 18kg of calamine, 8kg of feldspar, 5kg of water glass, 20kg of diatomite, 6kg of epoxy resin and 12kg of wheat starch.
(2) After soaking the coal gangue in water for 11h, calcining the coal gangue for 4h at 1650 ℃;
(3) conveying the calcined coal gangue to a fine crushing jaw crusher for primary crushing, and then performing secondary fine crushing by adopting a hammer crusher to obtain coal gangue particles of 200 meshes;
(4) weighing calamine and feldspar, and crushing to 200 meshes for later use;
(5) mixing calamine particles, feldspar particles and coal gangue particles, stirring for 20min at 70r/min, then sequentially adding diatomite, starch, epoxy resin and water glass, and stirring for 10min at 95r/min to obtain a mixture;
(6) covering the mixture with plastic cloth having 5 pores per square meter, and blowing CO into the mixture through the pores after 14 hr2Each pore CO2The blowing amount of (2) is 18m3And blowing for 2min, reserving 5 air holes as air outlet holes in each square meter of plastic cloth, and then uncovering the plastic cloth to obtain the coal gangue molding sand.
Test examples
The molding sand obtained in examples 1 to 5 of the present invention was subjected to the performance test, and the molding sand prepared from quartz sand was used as a comparative example, and the test results are shown in Table 1.
TABLE 1
Experimental results show that the coal gangue molding sand prepared by the invention has excellent heat resistance, air permeability and mechanical properties, and has remarkable progress compared with the molding sand prepared by quartz sand in the prior art.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A process for casting molding sand by using coal gangue is characterized by comprising the following steps:
(1) soaking the coal gangue in water for 8-12h, and calcining;
(2) conveying the calcined coal gangue to a crusher for primary crushing, and then performing secondary fine crushing by using the crusher to obtain coal gangue particles;
(3) weighing calamine and feldspar, and crushing for later use;
(4) uniformly mixing and stirring calamine particles, feldspar particles and coal gangue particles, then sequentially adding diatomite, starch, epoxy resin and water glass, and uniformly stirring again to obtain a mixture;
(5) covering the mixture with plastic cloth with air holes, and blowing CO into the mixture through the air holes after 12-24 hr2And then uncovering the plastic cloth to obtain the coal gangue molding sand.
2. The process for casting molding sand by using coal gangue as claimed in claim 1, wherein the raw materials comprise, by weight: 100-150 parts of coal gangue, 15-20 parts of calamine, 3-8 parts of feldspar, 5-15 parts of water glass, 15-20 parts of diatomite, 5-10 parts of epoxy resin and 10-12 parts of starch.
3. The process for casting molding sand by using coal gangue as claimed in claim 2, wherein the starch is one or more of wheat starch, tapioca starch and mung bean starch.
4. The process for casting molding sand using coal gangue as defined in claim 1, wherein the calcination temperature in step (1) is 1500-.
5. The process for casting molding sand using coal gangue as defined in claim 1, wherein the pulverized particle size of the coal gangue particles in step (2) is 200-300 mesh.
6. The process for casting molding sand using coal gangue as claimed in claim 1, wherein the crushing particle sizes of the calamine and the feldspar in the step (3) are 150-250 mesh.
7. The process for casting molding sand using coal gangue as claimed in claim 1, wherein the stirring rate in step (4) is 70-95r/min and the stirring time is 10-20 min.
8. The process for casting molding sand using coal gangue as claimed in claim 1, wherein the plastic cloth provided with air holes in step (5) has 4 to 6 air holes per square meter.
9. The process for foundry molding sand using coal gangue as claimed in claim 1, wherein each pore CO in step (5)2The blowing amount of the air is 15-20m3The air blowing time is 2-3 min.
10. The process for casting molding sand using coal gangue as claimed in claim 9, wherein,carrying out CO2When blowing, 1-2 air holes are reserved in each square meter as air outlet holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820681.1A CN111906244A (en) | 2020-08-14 | 2020-08-14 | Process for casting molding sand by using coal gangue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820681.1A CN111906244A (en) | 2020-08-14 | 2020-08-14 | Process for casting molding sand by using coal gangue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111906244A true CN111906244A (en) | 2020-11-10 |
Family
ID=73278015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010820681.1A Pending CN111906244A (en) | 2020-08-14 | 2020-08-14 | Process for casting molding sand by using coal gangue |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111906244A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521678A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Molding sand capable of increasing brightness of castings and preparation method thereof |
| CN105798223A (en) * | 2016-03-23 | 2016-07-27 | 刘建荣 | Technology for casting molding sand through coal gangue |
| CN105798240A (en) * | 2016-04-27 | 2016-07-27 | 无锡环宇精密铸造有限公司 | Method for forming coal gangue sand for precision casting facing sand |
| CN105880463A (en) * | 2016-06-20 | 2016-08-24 | 安徽宜安精密机械零部件有限公司 | Sand for precision casting and preparation process of sand for precision casting |
| CN107214291A (en) * | 2017-04-18 | 2017-09-29 | 芜湖市和蓄机械股份有限公司 | A kind of high temperature resistant, casting sand of high intensity and preparation method thereof |
| CN109093060A (en) * | 2018-08-30 | 2018-12-28 | 安徽惠明机械制造有限公司 | A kind of high-strength sand and preparation method thereof |
| CN111151701A (en) * | 2020-01-07 | 2020-05-15 | 山西超牌煅烧高岭土有限公司 | Method for producing Mullica sand by using coal gangue |
-
2020
- 2020-08-14 CN CN202010820681.1A patent/CN111906244A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521678A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Molding sand capable of increasing brightness of castings and preparation method thereof |
| CN105798223A (en) * | 2016-03-23 | 2016-07-27 | 刘建荣 | Technology for casting molding sand through coal gangue |
| CN105798240A (en) * | 2016-04-27 | 2016-07-27 | 无锡环宇精密铸造有限公司 | Method for forming coal gangue sand for precision casting facing sand |
| CN105880463A (en) * | 2016-06-20 | 2016-08-24 | 安徽宜安精密机械零部件有限公司 | Sand for precision casting and preparation process of sand for precision casting |
| CN107214291A (en) * | 2017-04-18 | 2017-09-29 | 芜湖市和蓄机械股份有限公司 | A kind of high temperature resistant, casting sand of high intensity and preparation method thereof |
| CN109093060A (en) * | 2018-08-30 | 2018-12-28 | 安徽惠明机械制造有限公司 | A kind of high-strength sand and preparation method thereof |
| CN111151701A (en) * | 2020-01-07 | 2020-05-15 | 山西超牌煅烧高岭土有限公司 | Method for producing Mullica sand by using coal gangue |
Non-Patent Citations (1)
| Title |
|---|
| 宋仁伯: "《材料成形工艺学》", 31 January 2019, 北京：冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107141009A (en) | A kind of ceramic water-permeable brick preparation method of use prilling | |
| CN109465378B (en) | Process for preparing artificial spherical ceramic sand for casting by using investment casting waste shell | |
| CN109020318B (en) | Baking-free solid brick utilizing redundant soil of construction waste and preparation method thereof | |
| CN111116070A (en) | Baking-free aggregate prepared from iron tailings and preparation method thereof | |
| CN109704791A (en) | A kind of recoverying and utilizing method of waste and old refractory material | |
| CN106277877A (en) | One utilizes red mud to produce high performance structures lightweight aggregate and preparation method thereof | |
| CN110104979B (en) | Method for preparing coal gangue lightweight aggregate by adopting belt sintering | |
| CN113683393B (en) | Method for preparing high-strength sintered water permeable brick by using copper tailing sand | |
| CN105669243A (en) | Desulfurized gypsum and iron tailings ceramsite and preparation method thereof | |
| WO2020082845A1 (en) | Method for using high alumina fly ash and coal gangue as raw materials to prepare foundry sand | |
| CN110950644A (en) | Steel slag sintered brick and preparation method thereof | |
| CN108996991A (en) | Utilize the architectural pottery and preparation method thereof of gold tailings and recycling gangue preparation | |
| CN109095799B (en) | Method for preparing ecological aggregate by coating modification of coal gangue | |
| CN105461263B (en) | It is non-burning brick and preparation method thereof | |
| CN103360105B (en) | Preparation method of coal gangue-red mud lightweight pottery sand with core-shell structure | |
| CN113912376A (en) | Baking-free ceramsite processed by utilizing red mud, fly ash, iron tailings and carbide slag solid waste as well as preparation method and application thereof | |
| CN113307650A (en) | Method for firing light ceramsite by using subway waste soil and machine-made sand tail mud | |
| CN103319143A (en) | Feldspar tailing unburned brick and preparation method thereof | |
| CN110257046A (en) | A method of petroleum fracturing propping agent is prepared using red mud and oil sludge and sand | |
| CN113248276A (en) | Method for firing light ceramsite by using river sludge and machine-made sand tail sludge | |
| CN111906244A (en) | Process for casting molding sand by using coal gangue | |
| CN104876534B (en) | A method of steam-pressing brisk is prepared using Tungsten tailing and tungsten ore barren rock | |
| CN103951261B (en) | A kind of with golden copper tailing foam glass material that is main raw material and preparation method thereof | |
| CN102994742A (en) | Method for producing sintered pellets by using red mud | |
| CN105669102A (en) | Dry-mixed mortar of replacing natural sand with construction waste machine-made sand |
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: 20201110 |
|
| RJ01 | Rejection of invention patent application after publication |