CN102744361A - Precise casing and shell-manufacturing method for sodium silicate - Google Patents
Precise casing and shell-manufacturing method for sodium silicate Download PDFInfo
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- CN102744361A CN102744361A CN2012102686651A CN201210268665A CN102744361A CN 102744361 A CN102744361 A CN 102744361A CN 2012102686651 A CN2012102686651 A CN 2012102686651A CN 201210268665 A CN201210268665 A CN 201210268665A CN 102744361 A CN102744361 A CN 102744361A
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- ammonium chloride
- shell
- hydrochloric acid
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- water
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Abstract
The invention discloses a precise casing and shell-manufacturing method for sodium silicate, which specifically comprises the following steps of: configuring and using a hardening agent by the following components by weight: 18-20 parts of ammonium chloride, 3-5 parts of hydrochloric acid and 100 parts of water; firstly, putting 100 parts of water into a hardening pool; then putting 18-20 parts of ammonium chloride powder into water; after the ammonium chloride powder is fully dissolved, slowly injecting weighed 3-5 parts of hydrochloric acid; in the hydrochloric acid injection process, monitoring the current intensity of the solution by a hardening status instrument; when the current reaches 150 milliamperes, stopping injecting into the hardening pool; and then, hardening a casting shell into the hardening pool to finish shell manufacture. According to the precise casing and shell-manufacturing method for sodium silicate, ammonia generated in the shell manufacture process can be fully utilized to improve the working environment, and meanwhile, ammonium chloride can be generated in the shell-manufacturing process so as to reduce the use amount of the ammonium chloride.
Description
Technical field
The invention belongs to casting industry, be specifically related to a kind of method of Lost Wax Casting shell, especially a kind of waterglass Lost Wax Casting shell side method.
Background technology
Particularly in the waterglass casting industry, its system shell adopts magnesium chloride, aluminium chloride and aqueous ammonium chloride solution to carry out cure process usually in casting industry.In these three kinds of process for making shell; Although wherein in use the ammonia generation is few for magnesium chloride and aluminum chloride aqueous solution, its hardening effect is poor, and cast product yield rate and quality are low; The problem of solidifying the bad cleaning in back simultaneously is very obvious, so sector application is less; Aqueous ammonium chloride solution is that the system shell is used the widest a kind of curing agent in the waterglass casting, still is that its ground floor system shell of aluminium chloride all be unable to do without ammonium chloride no matter be to use magnesium chloride.But make a general survey of the sclerosis process for making shell of existing ammonium chloride, it mainly exists in the system shell process can produce a large amount of ammonias, and this ammonia is serious to operator's actual bodily harm, and is also serious to corrosion on Equipment simultaneously; Also there is the high problem of energy consumption in existing in addition ammonium chloride sclerosis process for making shell.
Summary of the invention
The object of the present invention is to provide waterglass Lost Wax Casting shell side method, adopt this method can reduce ammonia emission in a large number, the use amount that can save ammonium chloride simultaneously to improving working environment, realizes that energy-conserving and environment-protective and cleaner production have great importance.
In order to realize the present invention, the technical scheme that a kind of waterglass Lost Wax Casting of the present invention shell side method is taked is following:
A kind of waterglass Lost Wax Casting shell side method, it specifically comprises:
Curing agent configuration and use by weight percentage, wherein:
Ammonium chloride 18-20
Hydrochloric acid 3-5
Water 100
At first fetch water 100 parts and put into the sclerosis pond; Then in water, put into the ammonium chloride powders of 18-20 part, treat that ammonium chloride powders fully dissolves after, slowly inject the hydrochloric acid 3-5 part take by weighing; Injecting the current strength that the hydrochloric acid process adopts hardening state appearance monitoring solution; When electric current reaches 150 MAHs, stop to annotate hydrochloric acid toward the sclerosis pond, then the foundry goods shell is put into the sclerosis of sclerosis pond and accomplishes the system shell.
Need to prove, according to the ratio of ammonium chloride, hydrochloric acid, water in the sclerosis pond, hydrochloric acid in the scope of 3-5 part, injects back solution can reach fully 150 milliamperes reach more than.
Ammonium chloride system shell sclerosis principle of the present invention is:
Its chemical formula is:
Na
2O·mSiO
2·nH
2O+2NH
4Cl→mSiO
2·(n-1)H
2O+2NaCl+2NH
3↑+2H
2O
Waterglass and ammonium chloride produce chemical reaction and generate the ammonia volatilization, and ammonia and hydrochloric acid react and generates ammonium chloride in aqueous ammonium chloride solution but add behind the hydrochloric acid directly, and ammonium chloride continues and waterglass hardens.Wherein the reactive chemistry formula of ammonia and hydrochloric acid is:
Adopt the inventive method can significantly reduce the generation of ammonia in the casting process.The applicant detects through the actual 5 place's difference samplings of workshop, and adopting the inventive method ammonia concentration mean value is 1.02mg/m
3, well below the 1.5mg/m of " odorant pollutant discharge standard " GB14954-93 requirement
3, meet Toxic standard in the yard air that hygiene department requires fully.Simultaneously, owing to utilize ammonia and hydrochloric acid to generate ammonium chloride, the use amount of ammonium chloride can be saved about 20%.
Positive effect of the present invention is: can suppress the ammonia volatilization on the one hand, two aspects improve the utilization rate of ammonium chloride, and the third aspect does not have ammonia volatilization nature not have smell, can improve workman's working environment.
Description of drawings
Fig. 1 is total principle chemical formula of a kind of waterglass Lost Wax Casting of the present invention shell side method;
Fig. 2 is the react chemical formula of generation ammonium chloride of a kind of waterglass Lost Wax Casting of the present invention shell side method ammonia and hydrochloric acid.
The specific embodiment
Below in conjunction with embodiment the present invention is done further elaboration, need to prove that the time of sclerosis can be set according to different processes:
Embodiment 1:
A kind of waterglass Lost Wax Casting shell side method, component is at first got hydrochloric acid 3-5 part and is placed in the hydrochloric acid container by weight; Take by weighing then 100 parts in water put into the sclerosis pond, then the sclerosis pond water in put into 18 parts ammonium chloride powders, treat that ammonium chloride powders fully dissolves after; Slowly inject the salt that takes by weighing; Injecting the current strength that the hydrochloric acid process adopts hardening state appearance monitoring solution,, stopping to annotate hydrochloric acid toward the sclerosis pond when electric current reaches 150 MAHs; To make the foundry goods of shell then and put into the sclerosis of sclerosis pond, accomplish the system shell.During sclerosis, waterglass and ammonium chloride produce chemical reaction and generate ammonia, wherein ammonia part volatilization, and most of parts are reacted generation ammonium chloride with hydrochloric acid.
Embodiment 2:
A kind of waterglass Lost Wax Casting shell side method, component is at first got hydrochloric acid 3-5 part and is placed in the hydrochloric acid container by weight; Take by weighing then 100 parts in water put into the sclerosis pond, then the sclerosis pond water in put into 20 parts ammonium chloride powders, treat that ammonium chloride powders fully dissolves after; Slowly inject the salt that takes by weighing; Injecting the current strength that the hydrochloric acid process adopts hardening state appearance monitoring solution,, stopping to annotate hydrochloric acid toward the sclerosis pond when electric current reaches 150 MAHs; To make the foundry goods of shell then and put into the sclerosis of sclerosis pond, accomplish the system shell.During sclerosis, waterglass and ammonium chloride produce chemical reaction and generate ammonia, wherein ammonia part volatilization, and most of parts are reacted generation ammonium chloride with hydrochloric acid.
The present invention not only can make full use of the ammonia that produces in the system shell process, improves working environment, in system shell process, can also generate ammonium chloride simultaneously, reduces the use amount of ammonium chloride.
Claims (1)
1. waterglass Lost Wax Casting shell side method is characterized in that: curing agent configuration and use by weight percentage, wherein:
Ammonium chloride 18-20
Hydrochloric acid 3-5
Water 100
At first fetch water 100 parts and put into the sclerosis pond; Then in water, put into the ammonium chloride powders of 18-20 part, treat that ammonium chloride powders fully dissolves after, slowly inject the hydrochloric acid 3-5 part take by weighing; Injecting the current strength that the hydrochloric acid process adopts hardening state appearance monitoring solution; When electric current reaches 150 MAHs, stop to annotate hydrochloric acid toward the sclerosis pond, then the foundry goods shell is put into the sclerosis of sclerosis pond and accomplishes the system shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102686651A CN102744361A (en) | 2012-08-01 | 2012-08-01 | Precise casing and shell-manufacturing method for sodium silicate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102686651A CN102744361A (en) | 2012-08-01 | 2012-08-01 | Precise casing and shell-manufacturing method for sodium silicate |
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|---|---|
| CN102744361A true CN102744361A (en) | 2012-10-24 |
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|---|---|---|---|
| CN2012102686651A Pending CN102744361A (en) | 2012-08-01 | 2012-08-01 | Precise casing and shell-manufacturing method for sodium silicate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104942219A (en) * | 2015-07-31 | 2015-09-30 | 南昌航空大学 | Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1190580A (en) * | 1997-09-18 | 1999-04-06 | Kao Corp | Composition of hardening agent for forming mold |
| CN1817504A (en) * | 2006-03-07 | 2006-08-16 | 陈福文 | Production of precisioning-cast mould |
-
2012
- 2012-08-01 CN CN2012102686651A patent/CN102744361A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1190580A (en) * | 1997-09-18 | 1999-04-06 | Kao Corp | Composition of hardening agent for forming mold |
| CN1817504A (en) * | 2006-03-07 | 2006-08-16 | 陈福文 | Production of precisioning-cast mould |
Non-Patent Citations (2)
| Title |
|---|
| 潘玉洪: "熔模精密铸造硬化液的pH值", 《凿岩机械气动工具》 * |
| 潘玉洪: "熔模铸造硬化工艺参数的再探讨", 《凿岩机械气动工具》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104942219A (en) * | 2015-07-31 | 2015-09-30 | 南昌航空大学 | Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent |
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Application publication date: 20121024 |