CN102627468A - Waste foundry sand aerated concrete building block and production process thereof - Google Patents

Waste foundry sand aerated concrete building block and production process thereof Download PDF

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Publication number
CN102627468A
CN102627468A CN2012101054349A CN201210105434A CN102627468A CN 102627468 A CN102627468 A CN 102627468A CN 2012101054349 A CN2012101054349 A CN 2012101054349A CN 201210105434 A CN201210105434 A CN 201210105434A CN 102627468 A CN102627468 A CN 102627468A
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China
Prior art keywords
foundry sand
building block
concrete building
discarded
gypsum
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Pending
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CN2012101054349A
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Chinese (zh)
Inventor
金立虎
秦大春
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金立虎
秦大春
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Priority to CN2012101054349A priority Critical patent/CN102627468A/en
Publication of CN102627468A publication Critical patent/CN102627468A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to a waste foundry sand aerated concrete building block and a production process thereof, and belongs to the technical fields of building materials and production processes. The waste foundry sand aerated concrete building block is characterized in that: the main production raw material of the aerated concrete building block is waste foundry sand and is proportioned with a proper amount of cement, quick lime, gypsum, gas forming agent and water; the waste foundry sand aerated concrete building block comprises the materials in percentage by mass: 65-80 percent of sand, 5-10 percent of cement, 15-20 percent of quick lime, 0-5 percent of gypsum, 0.04-0.08 percent of gas forming agent and a certain amount of water; and the requirement on concentration of waste foundry sand ground slurry is met. The production process has the flow comprising the following steps of: sieving and grinding the waste foundry sand; grinding the quick lime; grinding the gypsum; metering the three materials and the cement, the gas forming agent and the water respectively; mixing and stirring; and performing static stop pre-curing, reverse cutting and autoclaved curing to obtain a finished product. According to the invention, the waste foundry sand is used as the main raw material to prepare the energy-saving thermal insulation wall material which meets the requirements of national standard GB11968; and recycling of the waste foundry sand is facilitated.

Description

A kind of discarded foundry sand air-entrained concrete building block and production technique thereof
Technical field
The present invention relates to building materials manufacturing technology field; Be a kind ofly to utilize the discarded foundry sand in the mineral type refuse to be main raw material(s) specifically; Be equipped with a certain amount of cement, unslaked lime, gypsum, foaming agent and water again, produce the novel light insulating wall material that meets GB GB11968 requirement.
Background technology
Since the reform and opening-up, the foundary industry of China has had the great development of great-leap-forward, especially big, the large and medium-sized foundry enterprise of national hundreds of families; The discarded industrial molding sand of annual discharging has up to ten million tons; Most of enterprises all handle with the mode of landfill, have have not only occupied tract, have also polluted environment.The domestic enterprise that only a few is arranged like neat building materials development company in Qiqihar, uses discarded foundry sand instead of part medium sand to produce concrete solid brick and load-bearing concrete perforated brick; Because the addition content of discarded foundry sand is less than 20%; The ratio of utilizing is too little, does not reach the purpose of recycling economy, and major cause is: 1) alkalinity of discarded foundry sand is bigger; Can not be used for Steel Concrete, this has just significantly reduced its use range; What 2) discarded foundry sand used is silica sand, and its particle size is more even, is not continuous grading, lacks larger particles and than small-particle, in the production of concrete brick, can only use by the instead of part medium sand.Therefore, the usage quantity of discarded foundry sand does not just increase.Just because of these two shortcomings of discarded foundry sand, just making discarded foundry sand how to utilize becomes a hang-up, and the admixture ratio of utilizing that how will discard foundry sand increases substantially, and domestic almost is a blank in this respect.
It is main raw material that the present invention attempts with discarded foundry sand, mixes a certain proportion of cement, unslaked lime, gypsum, foaming agent and water, produces a kind of discarded foundry sand air-entrained concrete building block; The mixed ratio of discarded foundry sand can be brought up to 65-80%, and the silicon-dioxide purity of having brought into play discarded foundry sand is high, silt content is little, levigated fineness ratio flyash is wanted thin advantage, in two shortcomings of discarded foundry sand one; Be that grain composition is discontinuous; Through levigate processing, grain composition is discontinuous unimportant continuously, and another shortcoming is that alkalinity is higher; Produce air-entrained concrete building block; Sometimes also need add a spot of alkali, in this sense, this shortcoming becomes an advantage on the contrary.Owing to do not contain flammable charcoal in the discarded foundry sand, advantage such as it is compared with powder ash air-entrained concrete building block, has the intensity height, and frost resistance is good, and is "dead".This kind product meets GB GB11968 regulation, satisfies the requirement of building energy conservation 65%, integrates sharp useless, environmental protection, energy-conservation, reaches the purpose of recycling economy, realizes the high unity of the performance of enterprises, social benefit and environmental benefit.
Summary of the invention
The objective of the invention is to: overcome the obvious technological deficiency that exists in the discarded foundry sand recycle; That is: discarded foundry sand utilization is limited only within the instead of part medium sand; Producing concrete solid brick and load-bearing concrete perforated brick, is blank producing the air-entrained concrete building block technical field.For this reason; A kind of science of selecting materials, reasonable ratio, discarded high a kind of discarded foundry sand air-entrained concrete building block and the production technique thereof of foundry sand volume are provided, have filled up the blank of in producing the air-entrained concrete building block technical field, using the discarded foundry sand of high volume to produce air-entrained concrete building block.
Technical scheme of the present invention is achieved in that a kind of discarded foundry sand air-entrained concrete building block is with material and proportioning and production technique thereof.
A kind of discarded foundry sand air-entrained concrete building block of the present invention; The main production raw material of air-entrained concrete building block is discarded foundry sand; Carry out proportioning with a certain amount of cement, unslaked lime, gypsum, foaming agent and water again, according to mass percent, the proportioning of main raw material(s) is following:
Discarded foundry sand 65-80%;
Cement 5-10%;
Unslaked lime 15-20%;
Gypsum 0-5%;
Foaming agent accounts for the 0.04-0.08% of whole dry material quality, for adding;
The consumption of water satisfies the discarded levigate pulp density requirement of foundry sand.
The starting material physicals: discarded foundry sand particle is below 3mm, and dioxide-containing silica is more than 96%, and silt content is less than 1%; Cement P.042.5R; The calcium oxide content of unslaked lime is more than 80%; Gypsum is natural dihydrate gypsum or phosphogypsum; Foaming agent can be aluminium powder or aluminium powder cream.
A kind of discarded foundry sand air-entrained concrete building block technological process of production is following:
A. discarded foundry sand screening and deironing are handled, and other impurity and iron more than the 3.0mm are removed;
B. oven dry removes the earth processing, and the silt content that makes discarded foundry sand is less than 1%;
C. it is thin that discarded foundry sand adds water mill, and fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, and it is subsequent use that the slurry that mill is good deposits slurry pool in, and the concentration of slurry is at 55-60%;
D. levigate again after the fragmentation of unslaked lime and gypsum difference, fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, lays in feed bin separately subsequent use respectively;
E. the discarded foundry sand slurry of levigated and cement, unslaked lime, gypsum, foaming agent etc. are measured respectively, and put into and mix stirring in the liquid stirrers, churning time is controlled in the 4min;
F. the slurry that stirs is poured in the special-purpose mould, the slurry temperature of cast should be not less than 30 ℃;
G. will pour into a mould good slurry and send into the quiet foaming sclerosis in the curing room that stops in the lump together with mould, quiet envrionment temperature of stopping curing room should be not less than 50 ℃; The quiet about 3-4h of maintenance setting time that stops;
When reaching cutting intensity after h. maintenance being hardened, the demoulding in time, and be transferred to cutter special cutting;
I. the idiosome with well cutting makes up, and is sent to and carries out high temperature, high-pressure curing in the autoclave, and curing temperature is at 180-200 ℃, and maintenance pressure is at 0.8-1.3MPa, the about 8-10h of curing time;
J. when air-entrained concrete building block reaches the predetermined strength grade, turn off steam, cooling, step-down go out still, check, and salable product are gone into the finished product stockyard.
Description of drawings
Fig. 1 is technological process of production figure of the present invention
Embodiment
A kind of discarded foundry sand air-entrained concrete building block of the present invention and production technique thereof are described further as follows in conjunction with the technical scheme of 1 pair of invention of accompanying drawing:
Embodiment 1
The quality proportioning:
Discarded foundry sand 80%,
Cement 5%,
Unslaked lime 15%,
Gypsum 0%,
Foaming agent accounts for 0.04% of whole dry material quality, for adding;
The consumption of water satisfies the discarded levigate pulp density requirement of foundry sand.
A kind of discarded foundry sand air-entrained concrete building block technological process of production is following:
A. discarded foundry sand screening and deironing are handled, and other impurity and iron more than the 3.0mm are removed;
B. oven dry removes the earth processing, and the silt content that makes discarded foundry sand is less than 1%;
C. it is thin that discarded foundry sand adds water mill, and fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, and it is subsequent use that the slurry that mill is good deposits slurry pool in, and the concentration of slurry is at 55-60%;
D. levigate again after the fragmentation of unslaked lime and gypsum difference, fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, lays in feed bin separately subsequent use respectively;
E. with metering respectively such as levigated foundry sand slurry and cement, unslaked lime, gypsum, foaming agent, and put into and mix stirring in the liquid stirrers, churning time is controlled in the 4min;
F. the slurry that stirs is poured in the special-purpose mould, the slurry temperature of cast should be not less than 30 ℃;
G. will pour into a mould good slurry and send into the quiet foaming sclerosis in the curing room that stops in the lump together with mould, quiet envrionment temperature of stopping curing room should be not less than 50 ℃; The quiet about 3-4h of maintenance setting time that stops;
When reaching cutting intensity after h. maintenance being hardened, the demoulding in time, and be transferred to cutter special cutting;
I. the idiosome with well cutting makes up, and is sent to and carries out high temperature, high-pressure curing in the autoclave, and curing temperature is at 180-200 ℃, and maintenance pressure is at 0.8-1.3MPa, the about 8-10h of curing time;
J. when air-entrained concrete building block reaches the predetermined strength grade, turn off steam, cooling, step-down go out still, check, and salable product are gone into the finished product stockyard.
Embodiment 2
Weight proportion:
Discarded foundry sand 65%;
Cement 10%;
Unslaked lime 20%;
Gypsum 5%;
Foaming agent accounts for 0.08% of whole dry material quality, for adding;
The consumption of water satisfies the discarded levigate pulp density requirement of foundry sand.
The starting material physicals: discarded foundry sand particle is below 3mm, and dioxide-containing silica is more than 96%, and silt content is less than 1%; Cement P.042.5R; The calcium oxide content of unslaked lime is more than 80%; Gypsum is natural dihydrate gypsum or phosphogypsum; Foaming agent can be aluminium powder or aluminium powder cream.
A kind of discarded foundry sand air-entrained concrete building block technological process of production is following:
A. discarded foundry sand screening and deironing are handled, and other impurity and iron more than the 3.0mm are removed;
B. oven dry removes the earth processing, and the silt content that makes discarded foundry sand is less than 1%;
C. it is thin that discarded foundry sand adds water mill, and fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, and it is subsequent use that the slurry that mill is good deposits slurry pool in, and the concentration of slurry is at 55-60%;
D. levigate again after the fragmentation of unslaked lime and gypsum difference, fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, lays in feed bin separately subsequent use respectively;
E. with metering respectively such as levigated foundry sand slurry and cement, unslaked lime, gypsum, foaming agent, and put into and mix stirring in the liquid stirrers, churning time is controlled in the 4min;
F. the slurry that stirs is poured in the special-purpose mould, the slurry temperature of cast should be not less than 30 ℃;
G. will pour into a mould good slurry and send into the quiet foaming sclerosis in the curing room that stops in the lump together with mould, quiet envrionment temperature of stopping curing room should be not less than 50 ℃; The quiet about 3-4h of maintenance setting time that stops;
When reaching cutting intensity after h. maintenance being hardened, the demoulding in time, and be transferred to cutter special cutting;
I. the idiosome with well cutting makes up, and is sent to and carries out high temperature, high-pressure curing in the autoclave, and curing temperature is at 180-200 ℃, and maintenance pressure is at 0.8-1.3MPa, the about 8-10h of curing time;
J. when air-entrained concrete building block reaches the predetermined strength grade, turn off steam, cooling, step-down go out still, check, and salable product are gone into the finished product stockyard.

Claims (4)

1. discarded foundry sand air-entrained concrete building block is characterized in that: the main production raw material of air-entrained concrete building block is equipped with cement, unslaked lime, gypsum, foaming agent and water again for discarded foundry sand.
2. a kind of discarded foundry sand air-entrained concrete building block according to claim 1, it is characterized in that: according to mass percent, the proportioning of main raw material(s) is following:
Discarded foundry sand 65-80%;
Cement 5-10%;
Unslaked lime 15-20%;
Gypsum 0-5%;
Foaming agent accounts for the 0.04-0.08% of whole dry material quality, for adding;
The consumption of water satisfies the discarded levigate pulp density requirement of foundry sand.
3. a kind of discarded foundry sand air-entrained concrete building block according to claim 1 and 2 is characterized in that: discarded foundry sand dioxide-containing silica is more than 96%, and silt content is less than 1%; Cement P.042.5R; The calcium oxide content of unslaked lime is more than 80%; Gypsum is natural dihydrate gypsum or phosphogypsum; Foaming agent can be aluminium powder or aluminium powder cream.
4. discarded foundry sand air-entrained concrete building block production technique is characterized in that:
A. discarded foundry sand screening and deironing are handled, and other impurity and iron more than the 3.0mm are removed;
B. oven dry removes the earth processing, and the silt content that makes discarded foundry sand is less than 1%;
C. it is thin that discarded foundry sand adds water mill, and fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, and it is subsequent use that the slurry that mill is good deposits slurry pool in, and the concentration of slurry is at 55-60%;
D. levigate again after the fragmentation of unslaked lime and gypsum difference, fineness is controlled at the 0.08mm square hole sieve and tails over less than 20%, lays in feed bin separately subsequent use respectively;
E. the discarded foundry sand slurry of levigated and cement, unslaked lime, gypsum, foaming agent etc. are measured respectively, and put into and mix stirring in the liquid stirrers, churning time is controlled in the 4min;
F. the slurry that stirs is poured in the special-purpose mould, the slurry temperature of cast should be not less than 30 ℃;
G. will pour into a mould good slurry and send into the quiet foaming sclerosis in the curing room that stops in the lump together with mould, quiet envrionment temperature of stopping curing room should be not less than 50 ℃; The quiet about 3-4h of maintenance setting time that stops;
H. when reaching cutting intensity after the maintenance sclerosis, the demoulding in time, and be transferred on the cutter special and cut;
I. the idiosome with well cutting makes up, and is sent to and carries out high temperature, high-pressure curing in the autoclave, and curing temperature is at 180-200 ℃, and maintenance pressure is at 0.8-1.3MPa, the about 8-10h of curing time;
J. when air-entrained concrete building block reaches the predetermined strength grade, turn off steam, cooling, step-down go out still, check, and salable product are gone into the finished product stockyard.
CN2012101054349A 2012-04-12 2012-04-12 Waste foundry sand aerated concrete building block and production process thereof Pending CN102627468A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102875183A (en) * 2012-08-25 2013-01-16 马鞍山豹龙新型建材有限公司 Preparation process for autoclaved curing aerated brick
CN104355657A (en) * 2014-10-09 2015-02-18 合肥向荣环保科技有限公司 Anticorrosive aerated brick
CN104557109A (en) * 2014-12-19 2015-04-29 王仕中 Aerated concrete block and preparation method thereof
CN105272283A (en) * 2015-09-29 2016-01-27 马鞍山杰创塑胶科技有限公司 Fireproof flame retardation aerated building block and making method thereof
CN105272336A (en) * 2015-09-29 2016-01-27 马鞍山杰创塑胶科技有限公司 Aerated building block capable of releasing negative ions, and making method thereof
CN105272334A (en) * 2015-09-29 2016-01-27 马鞍山杰创塑胶科技有限公司 Polyacrylonitrile pulp-containing aerated building block and making method thereof
CN105693178A (en) * 2015-04-03 2016-06-22 湖北益通建设股份有限公司 Method for preparing A3.5B05-grade autoclaved aerated concrete block by quartz weathered sand and application thereof to wall
CN106316328A (en) * 2015-06-26 2017-01-11 安徽建晟纪元新材料科技有限公司 Method for producing autoclaved aerated concrete building blocks
CN108911665A (en) * 2018-07-13 2018-11-30 江苏大学 A method of sand aerated concrete block is prepared using cast waste sand
CN111592253A (en) * 2020-05-19 2020-08-28 建华建材(莱阳)有限公司 Mineral admixture and application thereof
CN111729741A (en) * 2020-05-20 2020-10-02 重庆聚威节能建材有限公司 Aerated concrete production equipment using waste sandstone as raw material

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CN102199045A (en) * 2011-03-25 2011-09-28 浙江大学 Method for preparing high-aluminum low-silicon autoclaved aerated concrete

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CN101786839A (en) * 2010-01-22 2010-07-28 广东省建筑材料研究院 Pyrite beneficiation tailing autoclaved aerated concrete block and production process thereof
CN102199045A (en) * 2011-03-25 2011-09-28 浙江大学 Method for preparing high-aluminum low-silicon autoclaved aerated concrete

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102875183A (en) * 2012-08-25 2013-01-16 马鞍山豹龙新型建材有限公司 Preparation process for autoclaved curing aerated brick
CN102875183B (en) * 2012-08-25 2014-09-10 马鞍山豹龙新型建材有限公司 Preparation process for autoclaved curing aerated brick
CN104355657A (en) * 2014-10-09 2015-02-18 合肥向荣环保科技有限公司 Anticorrosive aerated brick
CN104557109A (en) * 2014-12-19 2015-04-29 王仕中 Aerated concrete block and preparation method thereof
CN105693178A (en) * 2015-04-03 2016-06-22 湖北益通建设股份有限公司 Method for preparing A3.5B05-grade autoclaved aerated concrete block by quartz weathered sand and application thereof to wall
CN106316328A (en) * 2015-06-26 2017-01-11 安徽建晟纪元新材料科技有限公司 Method for producing autoclaved aerated concrete building blocks
CN105272283A (en) * 2015-09-29 2016-01-27 马鞍山杰创塑胶科技有限公司 Fireproof flame retardation aerated building block and making method thereof
CN105272336A (en) * 2015-09-29 2016-01-27 马鞍山杰创塑胶科技有限公司 Aerated building block capable of releasing negative ions, and making method thereof
CN105272334A (en) * 2015-09-29 2016-01-27 马鞍山杰创塑胶科技有限公司 Polyacrylonitrile pulp-containing aerated building block and making method thereof
CN108911665A (en) * 2018-07-13 2018-11-30 江苏大学 A method of sand aerated concrete block is prepared using cast waste sand
CN111592253A (en) * 2020-05-19 2020-08-28 建华建材(莱阳)有限公司 Mineral admixture and application thereof
CN111729741A (en) * 2020-05-20 2020-10-02 重庆聚威节能建材有限公司 Aerated concrete production equipment using waste sandstone as raw material

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Application publication date: 20120808