CN108642240B - Molten iron heat-preservation covering agent prepared from waste dust-removal cloth bags and preparation method - Google Patents
Molten iron heat-preservation covering agent prepared from waste dust-removal cloth bags and preparation method Download PDFInfo
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- CN108642240B CN108642240B CN201810477903.7A CN201810477903A CN108642240B CN 108642240 B CN108642240 B CN 108642240B CN 201810477903 A CN201810477903 A CN 201810477903A CN 108642240 B CN108642240 B CN 108642240B
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- waste
- cloth bag
- waste dust
- removal cloth
- molten iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
Abstract
A molten iron heat-insulating covering agent prepared from waste dust-collecting cloth bags comprises 80 ~ 99 wt% of waste dust-collecting cloth bag fine strips and 0.1 ~ 3 wt% of organic binder,limestone powder or waste clay brick powder or high-alumina brick powder with the particle size less than or equal to 0.088mm is not more than 20 percent. The preparation method comprises the following steps: crushing the whole waste dust removal cloth bag; spraying 50% of the organic binder on the crushed waste dust-collecting cloth bag strips; adding limestone powder or waste clay brick or brick powder of high-alumina brick, and adding 50% of the rest organic binder into the mixture; putting the mixture into a mould for compression molding; bundling and packaging; drying; packaging for later use or directly putting into a foundry ladle or a torpedo ladle. The density of the pressed block of the dust removal cloth bag used in the invention can be 0.80-1.0 g/cm3The loss on ignition is 70-78%, the carbon residue is 22-30%, and the quality of molten iron is not affected; the land occupation of waste materials is reduced, and the waste materials are effectively and comprehensively utilized; simple process and low investment.
Description
Technical Field
The invention relates to the technical field of a metal melt heat-preservation covering agent in the metallurgical industry, and specifically belongs to a molten iron heat-preservation covering agent and a preparation method thereof.
Background
In the ferrous metallurgy industry, due to the environmental protection pressure, the treatment requirement on flue gas is higher and higher, the dust content in the flue gas is high, the emission is not permitted, for a desulfurization and denitration kiln, if the dust content in the flue gas is high, the consumption of a desulfurizer is increased easily, the reaction efficiency is low, a denitration honeycomb body is blocked, and a catalyst fails, so that the dust removal is a commonly used process measure.
From a process perspective: the material of the dust removal cloth bag is C, H, O, N and other elements, the attached dust is also a material brought by the process, carbon combustion can bring certain heat, and the porous structure has a certain heat insulation effect. The covering agent for keeping the temperature of the molten iron in the iron-making system needs to keep the temperature, and certain limestone fine powder is added by utilizing the used dust removal cloth bag briquetting matter, so that the covering agent can be used as the heat-preservation covering agent, can provide heat, improves the heat-preservation effect, and can play a role in desulfurization.
The inventor searches a universal patent database and a Chinese and foreign patent database search platform, searches a keyword 'dust removal cloth bag' + 'recovery' or 'processing' search, and is similar to the invention of 14 patents and 68 utility models. The related patents are as follows:
a method for manufacturing cement admixture by using waste dust removal cloth bag incineration ash (CN201310088484.5) comprises the following steps: the method comprises the steps of taking a waste dust removal cloth bag generated in a cement plant as a raw material, placing the waste dust removal cloth bag into a kiln for calcination, wherein the calcination process is carried out in an oxidizing atmosphere at 850-950 ℃ for 2-4 hours, and the calcined ash is a finished cement admixture; the invention realizes the harmless and resource utilization of the waste dust removal cloth bag; the process is simple and the operation is convenient; the cement admixture prepared by the method has high activity.
A method and a device (CN201611142484.9) for processing a dust removal cloth bag are provided: discloses a method and a device for processing a dust removal cloth bag, wherein the method comprises the following steps: drying treatment, primary dust removal, cutting treatment and dust fiber separation treatment. Compared with the prior art, the method and the device for treating the dust removal cloth bag have the advantages that the treatment process links are few, the dust and fiber separation effect is good, the environmental pollution is effectively reduced, the dust removal cloth bag can be reused, and the resource waste is reduced; the processing device of the dust removal cloth bag has the advantages of reasonable structure, convenience in use and low processing cost.
A method (201510105873.3) for preparing activated carbon by using waste dust-collecting cloth bags comprises the following steps: discloses a method for preparing activated carbon by using a waste dust removal cloth bag, which comprises the steps of beating, shearing and drying; and putting the sample into a 500-degree muffle furnace for carbonization for 2 hours to obtain the product.
Other documents are not concerned with the handling of the recycle bags. In the reported data of a network document, the filter bag amount of a coal-fired power generation dust removal cloth bag is only 3255 tons, and the potential market for recycling and reproducing plastic particle products reaches 2.3 billion.
From the results of the technical search: the key point of the invention is that the cut raw materials have different specifications, processing, pressurizing and drying processes and proportioning processes. In conclusion, no process and formula report which are completely the same as the content of the molten iron heat-preservation covering agent prepared by utilizing the waste dust-removal cloth bags are reported.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the molten iron heat-preservation covering agent which is prepared by treating the waste dust-removal cloth bags and meets the requirements, so that the problems of waste dust-removal cloth bag accumulation and the like are solved, the waste dust-removal cloth bags are comprehensively utilized, the environmental pollution is reduced, the process is simple, the investment is low, the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags has a good heat-preservation effect, and the molten iron pollution is small.
It is desirable to provide a measure for achieving the above object:
the molten iron heat insulating covering agent prepared with waste dust collecting cloth bag consists of waste dust collecting cloth bag sliver 80 ~ 99 wt%, organic binder 0.1 ~ 3 wt%, and limestone powder or waste clay brick powder or alumina brick powder of size not greater than 0.088mm in 20 wt%.
It is characterized in that: the limestone powder is prepared by firing at 1200 ℃ for 3 hours, wherein the content of calcium oxide in percentage by weight is not less than 95%, and the particle size is not more than 0.088 mm.
It is characterized in that: the organic binder is: polyvinyl alcohol emulsion or styrene-acrylic emulsion or polyvinyl acetate emulsion.
It is characterized in that: the waste dust removal cloth bag thin strips contain iron wires or iron sheets in the waste dust removal cloth bags.
The method for preparing the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying 50% of the organic binder on the crushed waste dust-collecting cloth bag strips, and uniformly stirring;
3) adding limestone powder or waste clay brick or high-alumina brick powder which is not more than 20 percent, then adding 50 percent of the rest organic binder into the mixture, and uniformly stirring;
4) putting the uniformly stirred mixture into a die for compression molding;
5) bundling and packaging the waste dust removal cloth bag thin strips which are formed by pressing by adopting plastic or metal bundling bands or plastic packaging films with holes;
6) and (3) drying: natural drying or heating drying is adopted, and the moisture content after drying is not more than 2%;
7) drying, packaging, and directly adding into foundry ladle or torpedo ladle.
The density of the pressed block of the dust removal cloth bag used in the invention can be 0.80-1.0 g/cm3The loss on ignition is 70-78%, the carbon residue is 22-30%, and the quality of molten iron is not affected; the land occupation of waste materials is reduced, and the waste materials are effectively and comprehensively utilized; simple process and low investment.
Detailed Description
The present invention is described in detail below:
example 1
A molten iron heat-preservation covering agent prepared by using waste dust-removal cloth bags comprises the following raw materials in percentage by weight: waste dust-removing cloth bag fine strips: 99%, the organic binder is polyvinyl alcohol emulsion: 0.3 percent of limestone powder with the granularity less than or equal to 0.088 mm: 0.7 percent; the waste dust removal cloth bag strips comprise attached iron wires or iron segments; the limestone powder is prepared by burning at 1180 ℃ for 3 hours; the calcium oxide content is 96.8 percent by weight, and the granularity is less than or equal to 0.088 mm.
The method for preparing the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying 50% of 0.3% of polyvinyl alcohol emulsion on the crushed waste dust removal cloth bag strips, and uniformly stirring;
3) adding 0.7% of limestone powder, then adding 50% of the rest organic binder into the mixture, and uniformly stirring;
4) putting the uniformly stirred mixture into a die for compression molding;
5) bundling and packaging the waste dust removal cloth bag strips formed by pressing by adopting plastics;
6) and (3) drying: the natural drying mode is adopted; the moisture content after drying is wt 1.5%;
7) after being dried, the mixture is directly put into a foundry ladle for trial use.
Through trial, the ignition loss is 76.11%, the content of residual solids is 23.89%, and the heat preservation effect of the molten iron is good.
Example 2
A molten iron heat-preservation covering agent prepared by using waste dust-removal cloth bags comprises the following raw materials in percentage by weight: waste dust-removing cloth bag fine strips: 90 percent, and the organic binder is styrene-acrylic emulsion: 0.5 percent of limestone powder with the granularity less than or equal to 0.088 mm: 9.5 percent; the waste dust removal cloth bag strips comprise attached iron wires or iron segments; the limestone powder is prepared by burning at 1180 ℃ for 3 hours; the calcium oxide content is 95.6 wt%, and the granularity is less than or equal to 0.088 mm.
The method for preparing the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying 50% of the styrene-acrylic emulsion accounting for 0.5% of the using amount on the crushed waste dust removal cloth bag strips, and uniformly stirring;
3) adding 9.5% of limestone powder at one time, then adding the remaining 50% of styrene-acrylic emulsion into the mixture, and uniformly stirring;
4) putting the uniformly stirred mixture into a die for compression molding; the density of the waste dust collecting cloth bag thin strip rectangular block is 0.92g/cm3；
5) Bundling and packaging the waste dust removal cloth bag strips formed by pressing by adopting a metal bundling belt;
6) heating and drying; the moisture content after drying was 1.9 wt%;
7) after being dried, the mixture is directly put into a foundry ladle for trial use.
Through trial, the ignition loss is 72.48%, the content of residual solid is 27.52%, and the heat preservation effect of the molten iron is good.
Example 3
A molten iron heat-preservation covering agent prepared by using waste dust-removal cloth bags comprises the following raw materials in percentage by weight: waste dust-removing cloth bag fine strips: 95 percent, the organic binder is polyvinyl acetate emulsion: 2.5 percent of waste clay brick with the granularity less than or equal to 0.088 mm: 2.5 percent; the waste dust removal cloth bag strips comprise attached iron wires or iron segments;
the method for preparing the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying 50% of the 2.5% polyvinyl acetate emulsion on the crushed waste dust removal cloth bag strips, and uniformly stirring;
3) 2.5 percent of the waste clay brick is added at one time, and then 50 percent of the rest polyvinyl acetate emulsion is sprayed on the crushed waste dust removal cloth bag strips and is stirred uniformly;
4) putting the uniformly stirred mixture into a die for compression molding; the briquetting density of the waste dust collecting cloth bag thin strips is 1.15g/cm3；
5) Bundling and packaging the waste dust removal cloth bag strips pressed into square shapes by adopting a plastic packaging film with holes;
6) heating and drying; after drying, the water content was 1 wt%.
7) After being dried, the mixture is directly put into a foundry ladle for trial use.
Through trial, the ignition loss is 67.94%, the content of residual solids is 32.06%, and the heat preservation effect of the molten iron is good.
Example 4
A molten iron heat-preservation covering agent prepared by using waste dust-removal cloth bags comprises the following raw materials in percentage by weight: waste dust-removing cloth bag fine strips: 97%, the organic binder is polyvinyl acetate emulsion: 1.5 percent of waste high-alumina bricks with the granularity less than or equal to 0.088 mm: 1.5 percent; the waste dust removal cloth bag strips comprise attached iron wires or iron segments;
the method for preparing the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying 50% of 1.5% of polyvinyl acetate emulsion on the crushed waste dust removal cloth bag strips, and uniformly stirring;
3) 1.5 percent of the waste high-alumina bricks are added at one time, and then 50 percent of the rest polyvinyl acetate emulsion is sprayed on the crushed waste dust removal cloth bag strips and is stirred uniformly;
4) putting the uniformly stirred mixture into a mould and pressing the mixture into a square shape; the density of the waste dust collecting cloth bag thin strip rectangular block is 1.15g/cm3；
5) Bundling and packaging the waste dust removal cloth bag strips pressed into square shapes by adopting a plastic packaging film with holes;
6) heating and drying; the moisture content after drying is 0.5 wt%;
7) drying and directly placing into a foundry ladle for trial; through trial, the ignition loss is 67.94%, the content of residual solids is 32.06%, and the heat preservation effect of the molten iron is good.
Example 5
A molten iron heat-preservation covering agent prepared by using waste dust-removal cloth bags comprises the following raw materials in percentage by weight: waste dust-removing cloth bag fine strips: 92% and the organic binder is styrene-acrylic emulsion: 2 percent of limestone powder with the granularity less than or equal to 0.088 mm: 6 percent; (ii) a The waste dust removal cloth bag strips comprise attached iron wires or iron segments; the limestone powder is calcined at 1200 ℃ for 3 hours; the calcium oxide content is 98.3 wt%, and the granularity is less than or equal to 0.088 mm.
The method for preparing the molten iron heat-preservation covering agent prepared by using the waste dust-removal cloth bags comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying the styrene-acrylic emulsion with the dosage of 50% of 2% on the crushed waste dust removal cloth bag strips, and uniformly stirring;
3) adding 6 percent of limestone powder at one time, spraying 50 percent of the rest styrene-acrylic emulsion on the crushed waste dust removal cloth bag strips, and uniformly stirring;
4) putting the uniformly stirred mixture into a mould and pressing the mixture into a square shape; the density of the waste dust collecting cloth bag thin strip rectangular block is 1.15g/cm3；
5) Bundling and packaging the waste dust removal cloth bag strips pressed into square shapes by adopting a plastic packaging film with holes;
6) naturally drying, wherein the moisture content after drying is 0.8 wt%.
7) Drying and directly placing into a foundry ladle for trial; through trial, the ignition loss is 67.94%, the content of residual solids is 32.06%, and the heat preservation effect of the molten iron is good.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (1)
1. A method for preparing a molten iron heat-preservation covering agent prepared by utilizing waste dust-removal cloth bags,
the molten iron heat-insulating covering agent comprises 80 ~ 99 wt% of waste dust-collecting cloth bag strips, 0.1 ~ 3 wt% of organic binder, and 20 wt% or less of limestone powder or waste clay brick powder or high-alumina brick powder with particle size less than or equal to 0.088 mm;
the preparation method comprises the following steps:
1) firstly, crushing the whole waste dust removal cloth bag into thin strips with the width less than or equal to 20mm and the length less than or equal to 0.5 mm;
2) spraying 50% of the organic binder on the crushed waste dust-collecting cloth bag strips, and uniformly stirring;
3) adding limestone powder or waste clay brick or high-alumina brick powder which is not more than 20 percent, then adding 50 percent of the rest organic binder into the mixture, and uniformly stirring;
4) putting the uniformly stirred mixture into a die for compression molding;
5) bundling and packaging the waste dust removal cloth bag thin strips which are formed by pressing by adopting plastic or metal bundling bands or plastic packaging films with holes;
6) and (3) drying: natural drying or heating drying is adopted, and the moisture content after drying is not more than 2%;
7) drying, packaging, and directly adding into foundry ladle or torpedo ladle.
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| CN102941321A (en) * | 2012-11-20 | 2013-02-27 | 高振东 | Preparation method for composite heat-insulating covering agent |
| CN103144221A (en) * | 2013-04-03 | 2013-06-12 | 北京国兴五佳高分子纤维再生科技有限公司 | Method and system of recovering PPS (polyphenylene sulfide) in waste dust removal bag |
| CN104760365A (en) * | 2014-01-08 | 2015-07-08 | 浙江得威德环保科技有限公司 | Method for preparing composite plate by recycling bag type dust remover waste filter bags |
| CN203803905U (en) * | 2014-04-29 | 2014-09-03 | 北京国兴五佳高分子纤维再生科技有限公司 | Waste filtering bag treatment device |
| CN104353658B (en) * | 2014-11-05 | 2016-05-04 | 湖州格尔泰斯环保技术有限公司 | The recoverying and utilizing method of waste and old PTFE dedusting filtering bag |
| CN204325589U (en) * | 2014-11-07 | 2015-05-13 | 镇江垚鑫纤维制品科技有限公司 | Waste and old dust collection filter bag regeneration production line |
| CN104760956A (en) * | 2015-03-11 | 2015-07-08 | 广东工业大学 | Method of preparing activated charcoal from waste dust removal cloth bag |
| CN107500716A (en) * | 2017-09-07 | 2017-12-22 | 绵阳凤面科技有限公司 | A kind of waste material utilizes environment-friendly fireproof heat insulating material |
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