TW201643265A - Iron-containing wet agglomerate, method for producing the same and application thereof - Google Patents

Abstract

The present invention relates to an iron-containing wet agglomerate, a method for producing the same and an application thereof. A ferrous-containing briquetting composition is firstly mixed uniformly, and a forming process and a curing process are performed sequentially, thereby obtaining the ferrous-containing wetting briquetting block. The aforementioned ferrous-containing briquetting composition includes an iron sand, an adhesive and a material containing calcium oxide. Moreover, based on the ferrous-containing wetting briquetting block as 100wt%, the ferrous-containing wetting briquetting block includes less than 3 wt% of water.

Description

Iron-containing wet building block and manufacturing method and application thereof

The invention relates to an iron-containing agglomerate and a manufacturing method thereof, in particular to an iron-containing wet building block with low water content, a manufacturing method and application thereof.

In the iron and steel chain process of Xizhi, in order to improve the quality of molten iron, oxygen is generally blown at the supersonic top blowing speed. However, when oxygen is blown into the molten molten iron at a supersonic speed, the oxygen strikes the molten iron surface and causes a spitting phenomenon to produce a small particle splashing iron bath.

When the aforementioned splash iron bath is separated from the molten iron surface, it will cool the spattered iron sand which forms small particles, and the gas flow of the gas generated by decarburization enters the top of the furnace (Off Gas; OG) treatment and dust collection. In the system. When the exhaust gas passes through the first water washing and dust collecting device, the sprayed iron sand is collected to obtain the Basic Oxygen Steelmaking Process (BOP) iron sand. Among them, because the total iron content of BOP iron sand is as high as 85wt% to 90 wt%, and the metal iron content is 65 wt% to 80 wt%, so it is an excellent secondary resource.

In order to effectively use BOP iron sand, BOP iron sand is generally dried and then made into a block (ie, iron-containing dry block), which is put into the converter as scrap steel for effective use. However, the aforementioned drying step requires more energy and increases energy costs. Furthermore, when the direct drying method is adopted, the dried iron sand particles are inhaled by the hot air drying dust collecting device, causing loss; and when the indirect drying method is adopted, in addition to the energy efficiency, the dry BOP is transported. In the case of iron sand, the iron sand particles are still scattered and defective.

In addition, when the drying step is carried out, the water-containing BOP iron sand is affected by the high temperature environment, and the iron in the iron sand is more easily oxidized, and the total iron content is lowered, thereby reducing the recycling efficiency.

In view of this, it is extremely necessary to provide an iron-containing wet building block and a manufacturing method and application thereof to improve the defects of the conventional iron-containing wet building block and its manufacturing method and application.

Accordingly, an aspect of the present invention provides a method for producing an iron-containing wet building block by controlling the water content of the iron sand to effectively solve the disadvantages of the conventional drying process energy consumption.

Another aspect of the present invention is to provide an iron-containing wet building block which is obtained by the aforementioned method.

According to one aspect of the invention, a method of making an iron-containing wet building block is presented. The method for manufacturing the iron-containing wet building block is to first uniformly mix the iron-containing agglomerates Composition. The iron-containing agglomerate composition comprises iron sand, an adhesive, and a material having calcium oxide.

The aforementioned iron sand system is recovered from the alkaline oxygen steel making process. The iron sand contains 85 wt% to 90 wt% of total iron content and 4 wt% to 10 wt% of water based on 100 wt% (wt%) of the total weight of the iron sand. Among them, the iron sand contains 65 wt% to 80 wt% of metallic iron based on the total iron content of 100 wt%.

The aforementioned adhesive contains starch. The material having calcium oxide contains 60% by weight to 90% by weight of calcium oxide based on the total amount of the foregoing material having calcium oxide being 100% by weight.

The total amount of the iron sand and the binder is 100% by weight, the iron sand may be used in an amount of 94% by weight to 99% by weight, and the adhesive may be used in an amount of 1% by weight to 6% by weight, based on the amount of the adhesive used, 100% by weight. The material having calcium oxide may be used in an amount of 5 wt% to 30 wt%.

After uniformly mixing the iron-containing agglomerate composition, the iron-containing agglomerate composition is subjected to a molding step to form the iron-containing agglomerate composition to form an iron-containing wet mass. Next, the iron-containing wet block is subjected to a curing step to obtain a wet iron-containing block. Wherein, the iron-containing wet building block contains no more than 3% by weight of water based on 100% by weight of the iron-containing wet building block.

According to an embodiment of the invention, the aforementioned material having calcium oxide may comprise cement, lime or any combination of the above materials.

According to another embodiment of the present invention, the treatment time of the aforementioned curing step is not less than 72 hours.

According to another aspect of the invention, an iron-containing wet building block is proposed. This iron-containing wet building block was obtained by the method described above. Among them, the iron-containing wet building block contains iron sand and water.

The total amount of iron sand used is 100 wt%, the iron sand contains 85 wt% to 90 wt% of total iron content, and the iron sand contains 65 wt% to 80 wt% of metallic iron based on the total iron content of 100 wt%.

Secondly, based on the total content of the aforementioned iron-containing wet building block being 100% by weight, the content of the iron sand may be 94% by weight to 99% by weight, and the content of water is not more than 3% by weight.

The iron-containing wet building block of the invention and the manufacturing method and application thereof use the material with calcium oxide to remove the moisture contained in the wet iron sand, without the conventional drying step, thereby reducing the energy cost and solving the drying Improve the recyclability of waste resources by the defects caused by the dry steps.

100‧‧‧ method

110‧‧‧Steps for uniformly mixing iron-containing agglomerates

120‧‧‧Making steps

130‧‧‧Protection steps

140‧‧‧ Manufactured iron-containing wet blocks

FIG. 1 is a partial flow chart showing a method of manufacturing an iron-containing wet building block according to an embodiment of the present invention.

The making and using of the embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable inventive concepts that can be implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

Please refer to FIG. 1 , which is a partial flow chart showing a method of manufacturing an iron-containing wet building block according to an embodiment of the present invention. In one embodiment, the method of fabrication 100 first uniformly mixes the iron-containing agglomerate composition as shown in step 110. The iron-containing agglomerate composition comprises iron sand, an adhesive, and a material having calcium oxide.

The foregoing iron sand system is recovered from a Basic Oxygen Process (BOP) and is 100% by weight (wt%) based on the total weight of the iron sand, and the iron sand contains 85 wt% to 90 wt% of total iron (Totla Fe; t -Fe) content. Among them, the iron sand contains 65 wt% to 80 wt% of metallic iron based on the total iron content of 100 wt%.

If the total iron content is less than 85 wt% or the metal iron content is less than 65 wt%, the iron-containing wet building block is not suitable for the steel metallurgical chain process because the iron content is too low.

In addition, if the iron-containing wet block with too low iron content is applied to the iron and steel chain process, the iron-containing wet block with lower iron content will increase the impurities of the molten iron and reduce the efficiency of the iron and steel chain process.

The iron sand is used in an amount of from 94% by weight to 99% by weight, based on the total amount of the iron sand and the binder, and is preferably from 97% by weight to 99% by weight.

If the content of the iron sand is less than 94% by weight, the iron content of the prepared iron-containing wet building block is too small, thereby reducing the recycling efficiency and reducing the efficiency of the steel metallurgical chain process.

The aforementioned adhesive may comprise starch, water glass, polyvinyl alcohol, molasses, benton, dextrin, asphalt, other suitable materials or any mixture of the above.

The total amount of the iron sand and the binder to be used is 100% by weight based on the above, and the amount of the adhesive is from 1% by weight to 6% by weight, preferably from 1% by weight to 3% by weight.

In the subsequent forming step, the adhesive can closely bond the various components of the iron-containing agglomerate composition to form a wet iron-containing block.

If the amount of the adhesive used is less than 1% by weight, too little adhesive cannot bond the components in the iron-containing agglomerate composition, so that the iron-containing agglomerate composition cannot form a wet iron-containing block.

If the amount of the adhesive is more than 6% by weight, the excessive adhesive can bond other components, but the content of other components is relatively reduced, and the effect of the prepared iron-containing wet building block on the iron and steel chain process is reduced.

Specific examples of the foregoing material having calcium oxide may include, but are not limited to, cement, lime, other suitable materials, or any mixture of the above materials.

The material having calcium oxide may comprise 60% by weight to 90% by weight of calcium oxide, and preferably 80% by weight to 90% by weight of calcium oxide, based on the total amount of the material having calcium oxide being 100% by weight.

Calcium oxide in the material with calcium oxide can react with the moisture in the iron-containing wet building block, and reduce the moisture content of the iron-containing wet building block, thereby solving the defects of the conventional iron-containing agglomerate and satisfying the steel metallurgy The need for chain processing.

If the content of the calcium oxide is less than 60% by weight, only a part of the water in the iron-containing wet building block can react with the calcium oxide, and the water content of the iron-containing wet building block cannot be effectively reduced.

If the content of calcium oxide is more than 90% by weight, excessive calcium oxide will lower the moisture content in the iron-containing agglomerate composition and be too dry, so that the components of the iron-containing agglomerate composition are not easily bonded into agglomerates.

The material having calcium oxide may be used in an amount of 5 wt% to 30 wt% based on the total use amount of the foregoing adhesive agent being 100 wt%.

If the amount of the material having calcium oxide is less than 5% by weight, the content of calcium oxide is relatively reduced to cause the same drawback as described above.

If the amount of the material having calcium oxide is more than 30% by weight, the amount of the iron sand used is relatively reduced, and the total iron content of the obtained iron-containing wet building block is lowered, thereby reducing the recovery efficiency.

After performing the foregoing step 110, the iron-containing agglomerate composition is sequentially subjected to a molding step and a curing step to obtain an iron-containing wet building block, as shown in steps 120, 130 and 140, respectively.

The aforementioned molding step utilizes a conventional agglomerating apparatus to form an iron-containing agglomerate composition into an iron-containing wet mass.

Secondly, the aforementioned curing step is to statically store the iron-containing wet block obtained by the molding step in a room temperature (about 10 ° C to 40 ° C) and ventilated environment, so that the iron-containing wet block is formed into a Iron wet building blocks.

In one embodiment, the treatment time of the curing step is preferably not less than 72 hours.

If the curing step is not less than 72 hours, the calcium oxide in the calcium oxide material can more effectively reduce the moisture contained in the iron-containing wet building block, so that the prepared iron-containing wet building block meets the steel metallurgy The need for chain processing.

The prepared iron-containing wet building block is further measured by the Japanese Industrial Standards (JIS) No. M8712-1971, wherein the iron-containing wet building block is rotated 13 times by the drum, Screened by a screen with a mesh size of 6.3 mm, the part of the screen must be greater than 88% to meet the strength requirements.

In one embodiment, the iron-containing wet building block contains no more than 3% by weight of water based on 100 parts by weight of the iron-containing wet building block, and the average wetness of the iron-containing wet building block is not less than 97%.

If the iron-containing wet block contains more than 3% by weight of water, too much water will reduce the efficiency of the steel metallurgical process.

The following examples are used to illustrate the application of the present invention, and are not intended to limit the present invention, and various modifications and refinements can be made without departing from the spirit and scope of the invention.

Example

94 wt% to 99 wt% of iron sand, 1 wt% to 6 wt% of an adhesive, and a material having calcium oxide are uniformly mixed, and the mixed iron-containing agglomerate composition is subjected to a molding step to form an iron-containing wet block. Among them, the amount of the material having calcium oxide is 5 wt% to 30 wt%, based on the amount of the adhesive used, 100 wt%.

Next, the iron-containing wet block was subjected to a curing step, and after 72 hours, the iron-containing wet building block of the example was obtained. Wherein, the iron-containing wet building block contains no more than 3% by weight of water based on 100% by weight of the prepared iron-containing wet building block.

Please refer to Table 1, which is the ratio of the components in the iron-containing agglomerate composition (ie, before agglomeration) and the iron-containing wet block (ie, after agglomeration) of the examples. In particular, since the values in Table 1 are averaged based on the data obtained by the 15 experimental groups, and only the main components are listed, the sum is not 100% by weight, of which the foregoing plurality The experimental group produced an iron-containing wet building block according to the method set forth in the examples.

However, according to the contents of Table 1, the production method of the present invention does not cause loss of composition in the iron-containing agglomerate composition.

Secondly, please continue to refer to Table 1. After the agglomeration, the iron-containing wet blocks still have a relatively high total iron content (greater than 80%), and the metal iron content is also greater than 65%. Accordingly, the manufacturing method of the present invention can effectively improve the defects that the conventional metal iron is oxidized by the influence of high temperature and moisture, and thus the prepared iron-containing wet building block can be applied to the steel metallurgy chain process, thereby reducing The amount of scrap used.

Please refer to Table 2, and the values listed in Table 2 are the drum strengths of the iron-containing wet blocks prepared by the above plurality of experimental groups. According to the contents of the second table, the iron-containing wet block produced by the method for producing an iron-containing wet block of the present invention has a good roll strength (average roll strength of 97.1%), so that it can meet the demand of the back end application.

Comparative example

The iron-containing agglomerate of the comparative example firstly mixes the dried iron sand and the adhesive uniformly, and the mixture is subjected to a molding step to form an iron-containing block.

Then, the iron-containing agglomerate of the comparative example was obtained by subjecting the iron-containing block to a drying step, and the roller strength was 97%.

However, after the aforementioned drying step, the total iron content of the iron-containing agglomerates decreased to 55 wt%.

Accordingly, the iron-containing agglomerates of the comparative examples are affected by the high temperature environment and moisture of the drying, and the metallic iron contained therein is oxidized to lower the total iron content of the iron-containing agglomerates.

It can be seen from the examples and comparative examples of the present invention that the present invention utilizes calcium oxide by adding a material having calcium oxide to the iron-containing agglomerate composition. The reaction with the contained water reduces the moisture content of the prepared iron-containing wet building block, thereby preventing the metal iron of the iron-containing wet building block from being oxidized.

Secondly, the manufacturing method of the present invention uses the iron sand produced by the alkaline oxygen steelmaking process as a bulk material to obtain a ferrous iron-containing wet building block rich in metal iron, and the prepared iron-containing wet building block can be used as steel. The scrap steel required for the smelting process can reduce the cost of raw materials and effectively recycle waste gas resources.

Furthermore, since the method for manufacturing the iron-containing wet building block of the present invention does not require a drying step, the energy cost can be reduced, and the defects of the dry iron sand powder flying pollution can be avoided after the conventional drying step/drying step. .

The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100‧‧‧ method

110‧‧‧Steps for uniformly mixing iron-containing agglomerates

120‧‧‧Making steps

130‧‧‧Protection steps

140‧‧‧ Manufactured iron-containing wet blocks

Claims (4)

A method for producing an iron-containing wet building block comprising: uniformly mixing an iron-containing agglomerate composition, wherein the iron-containing agglomerate composition comprises: an iron sand, which is recovered from an alkaline oxygen steelmaking process, based on the total of the iron sand The weight is 100 weight percent (wt%), the iron sand contains 85 wt% to 90 wt% of total iron content and 4 wt% to 10 wt% of water, and based on the total iron content is 100 wt%, the iron sand comprises 65 wt% to 80 wt% a metal iron; an adhesive comprising a starch; and a material having calcium oxide, the total amount of the material based on the calcium oxide being 100% by weight, the material having calcium oxide comprising 60% by weight to 90% by weight of the oxidation Calcium, and wherein the total amount of the iron sand and the adhesive is 100% by weight, the iron sand is used in an amount of 94% by weight to 99% by weight, and the adhesive is used in an amount of 1% by weight to 6% by weight based on the adhesive The amount of the material having calcium oxide is 5 wt% to 30 wt%; the iron-containing agglomerate composition is subjected to a molding step to form the iron-containing agglomerate composition to form an iron-containing wet block. And performing a curing step on the iron-containing wet block to obtain the Wet agglomeration of iron, wherein the iron-based wet agglomeration of 100wt%, the iron-containing wet agglomeration comprising not more than 3wt% water. The method for producing an iron-containing wet building block according to claim 1, wherein the material having calcium oxide comprises cement, lime or any mixture of the above materials. The method for producing an iron-containing wet building block according to claim 1, wherein the curing step has a treatment time of not less than 72 hours. An iron-containing wet building block obtained by the method according to any one of claims 1 to 3, wherein the iron-containing wet building block comprises: an iron sand, wherein the total amount of the iron sand based on the iron sand is 100 wt%, the iron sand comprises a total iron content of 85 wt% to 90 wt%, and based on the total iron content being 100 wt%, the iron sand comprises 65 wt% to 80 wt% of one metal iron; and water, and wherein the iron is wet based thereon One of the agglomerates has a total content of 100% by weight, one of the iron sands has a content of 94% by weight to 99% by weight, and one of the water contents is not more than 3% by weight.