CN101956068A - Method for producing steelmaking iron blocks by using steelmaking sludge - Google Patents
Method for producing steelmaking iron blocks by using steelmaking sludge Download PDFInfo
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- CN101956068A CN101956068A CN2009102732287A CN200910273228A CN101956068A CN 101956068 A CN101956068 A CN 101956068A CN 2009102732287 A CN2009102732287 A CN 2009102732287A CN 200910273228 A CN200910273228 A CN 200910273228A CN 101956068 A CN101956068 A CN 101956068A
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Abstract
The invention relates to a method for producing steelmaking iron blocks by using the iron-containing soot of a converter, which comprises the following steps of: screening steelmaking sludge, wherein the +20-mesh steelmaking sludge accounts for less than or equal to 3 percent of the total weight of the steelmaking sludge; grinding; screening and grading, wherein the grain size is controlled to be -40 meshes; drying, wherein the moisture content before drying is less than or equal to 10 percent and the moisture content after drying is less than or equal to 1 percent; magnetically separating, wherein the purity content after the separation is less than or equal to 5 percent; molding, wherein 95 to 97.5 weight percent of sponge iron containing tetrafluoroethylene (Tfe) is uniformly mixed with the magnetically separated steelmaking sludge, the sponge iron with the grain size of -100 meshes accounts for 8 to 20 percent, and the steelmaking sludge accounts for 92 to 80 percent; or mixing the processed 98 to 95 percent of the steelmaking sludge with 2 to 5 percent of bentonite serving as a binding material directly and uniformly and processing the mixed materials to obtain the required iron blocks. In the invention, the iron-containing soot of the converter is recycled as a secondary resource, the process is simple, the process parameters and the iron block quality can be easily controlled, and the steelmaking is provided the iron blocks which are stable in quality and meets requirements.
Description
Technical field
The present invention relates to the comprehensive utilization of converter refining iron-containing dust, especially belong to the method for producing the steely iron piece with converter refining iron-containing dust.
Background technology
A large amount of research was all done in utilization to steel-smelting sewage sludge for many years both at home and abroad, dry process scheme and wet processing schemes such as ball sintering process, slag handling process, chlorination process have successively been proposed to make, but all there are problems in these schemes, as complex process, or difficult quality control, or cost is high, is difficult to be utilized effectively always.The nineties, climb steel and begin to attempt to extract iron powder and be used for chemical industry and make reductive agent and use with steel-smelting sewage sludge.And present technique is that the iron powder that mud extracts is made high-quality steel-making iron block, is directly used in steel-making, solves the domestic high-quality iron block situation that needs import in short supply.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, a kind of converter refining iron-containing dust secondary resource circulation comprehensive utilization that both not only realized is provided, technology is simple, and processing parameter and iron block quality are easy to control, and the production method of the iron block that meets the demands can be provided for steel-making.
Realize the technical measures of above-mentioned purpose:
Utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤3%, and TFe accounts for 50～64% of total weight percent;
2) carry out grinding, the time is controlled to be 20～30 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is≤10%, and dried weight in wet base per-cent is≤1%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is≤5%;
6) carry out moulding: the sponge iron that will contain the weight percent 95～97.5% of Tfe mixes with steel-smelting sewage sludge after magnetic separation, wherein, the weight percent of sponge iron is 8～20%, and the granularity of control sponge iron is-100 orders, and the weight percent of steel-smelting sewage sludge is 92～80%.
Utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤3%, and TFe accounts for 50～64% of total weight percent;
2) carry out grinding, the time is controlled to be 20～30 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is≤10%, and dried weight in wet base per-cent is≤1%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is≤5%;
6) carry out moulding: adding weight percent and be 2～5% wilkinites as caking agent, is the iron block that 98～95% steel-smelting sewage sludge uniform mixing post-treatment becomes needs with weight percent.
It is: described bentonitic performance index are: inhale blue amount: 23～38 grams/100 grams, and colloid index 50～500 milliliters/5 grams, moisture (weight percent): 10～14%, granularity :-100 orders are (weight percent): 90～99%.
The present invention compared with prior art, its characteristics: both not only realized the utilization of converter refining iron-containing dust secondary resource circulation comprehensive, technology is simple, processing parameter and iron block quality are easy to control, and can provide the iron block that meets the demands for steel-making, the iron block steady quality has satisfied the requirement of steel-making fully.
Embodiment
Be described in detail below:
Embodiment 1
Utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent 2.9%, and TFe accounts for 50% of total weight percent;
2) carry out grinding, the time is controlled to be 20 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is 10%, and dried weight in wet base per-cent is 0.95%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is 5%;
6) carry out moulding: the sponge iron that will contain the weight percent 95% of Tfe mixes with steel-smelting sewage sludge after magnetic separation, and wherein, the weight percent of sponge iron is 8%, and the granularity of control sponge iron is-100 orders, and the weight percent of steel-smelting sewage sludge is 92%.
Embodiment 2
Utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent 2.5%, and TFe accounts for 52% of total weight percent;
2) carry out grinding, the time is controlled to be 23 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is 8%, and dried weight in wet base per-cent is 0.8%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is 4%;
6) carry out moulding: the sponge iron that will contain the weight percent 96.5% of Tfe mixes with steel-smelting sewage sludge after magnetic separation, and wherein, the weight percent of sponge iron is 13%, and the granularity of control sponge iron is-100 orders, and the weight percent of steel-smelting sewage sludge is 87%.
Embodiment 3
Utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent 2.2%, and TFe accounts for 51% of total weight percent;
2) carry out grinding, the time is controlled to be 25 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is 6.5%, and dried weight in wet base per-cent is 0.75%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is 4.2%;
6) carry out moulding: the sponge iron that will contain the weight percent 99.8% of Tfe mixes with steel-smelting sewage sludge after magnetic separation, and wherein, the weight percent of sponge iron is 120%, and the granularity of control sponge iron is-100 orders, and the weight percent of steel-smelting sewage sludge is 80%.
Embodiment 4
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤2.0%, and TFe accounts for 56% of total weight percent;
2) carry out grinding, the time is controlled to be 28 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is 9%, and dried weight in wet base per-cent is 1%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is 3.6%;
6) carry out moulding: adding weight percent and be 2% wilkinite as caking agent, is the iron block that 98% steel-smelting sewage sludge uniform mixing post-treatment becomes needs with weight percent.
Its described bentonitic performance index are: inhale blue amount: 25 grams/100 grams, and colloid index 50 milliliters/5 grams, moisture (weight percent): 10%, granularity :-100 orders are (weight percent): 90%.
Embodiment 5
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤1.6%, and TFe accounts for 60% of total weight percent;
2) carry out grinding, the time is controlled to be 25 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is 6%, and dried weight in wet base per-cent is 0.8%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is 3.0%;
6) carry out moulding: adding weight percent and be 3.0% wilkinite as caking agent, is the iron block that 97% steel-smelting sewage sludge uniform mixing post-treatment becomes needs with weight percent.
Its described bentonitic performance index are: inhale blue amount: 30 grams/100 grams, and colloid index 350 milliliters/5 grams, moisture (weight percent): 12%, granularity :-100 orders are (weight percent): 95%.
Embodiment 6
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤1.8%, and TFe accounts for 64% of total weight percent;
2) carry out grinding, the time is controlled to be 30 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is 8.5%, and dried weight in wet base per-cent is 0.7.6%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is 1.1%;
6) carry out moulding: adding weight percent and be 5.0% wilkinite as caking agent, is the iron block that 95% steel-smelting sewage sludge uniform mixing post-treatment becomes needs with weight percent.
Its described bentonitic performance index are: inhale blue amount: 37.5 grams/100 grams, and colloid index 500 milliliters/5 grams, moisture (weight percent): 14%, granularity :-100 orders are (weight percent): 99%.
The technical indicator of the steel-smelting sewage sludge after above-mentioned processing sees Table 1
The technical indicator of the steel-smelting sewage sludge after table 1 is handled
| Index | ≥94.8％? | ≥85.6％? | ≤0.99％? | ≤0.09％? | ≤0.018％? | ≤1.78％? | 〉=5.3 gram per centimeters 3 |
Above-mentioned made steely iron piece, after testing, its performance sees Table 2
The technological standard of table 2 steel-making iron block
| Project | Full iron | Metallic iron | Carbon | Phosphorus | Sulphur | Silicon-dioxide | Density |
| Project | Full iron | Metallic iron | Carbon | Phosphorus | Sulphur | Silicon-dioxide | Density |
| Index | ≥90％? | ≥82％? | ≤1.2％? | ≤0.1％? | ≤0.02％? | ≤4.5％? | 〉=4.4 gram per centimeters 3 |
It is used that its steel-making iron block has satisfied steel-making fully.
Claims (3)
1. utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤3%, and TFe accounts for 50～64% of total weight percent;
2) carry out grinding, the time is controlled to be 20～30 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is≤10%, and dried weight in wet base per-cent is≤1%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is≤5%;
6) carry out moulding: the sponge iron that will contain the weight percent 95～97.5% of Tfe mixes with steel-smelting sewage sludge after magnetic separation, wherein, the weight percent of sponge iron is 8～20%, and the granularity of control sponge iron is-100 orders, and the weight percent of steel-smelting sewage sludge is 92～80%.
2. utilize steel-smelting sewage sludge to produce the method for steely iron piece, its step:
1) steel-smelting sewage sludge is sieved its granularity requirements :+20 purpose steel-smelting sewage sludges account for total weight percent≤3%, and TFe accounts for 50～64% of total weight percent;
2) carry out grinding, the time is controlled to be 20～30 minutes;
3) carry out sieve classification, its granularity is controlled at-40 orders;
4) carry out drying, the weight in wet base per-cent before its control is dry is≤10%, and dried weight in wet base per-cent is≤1%;
5) carry out magnetic separation, the weight percent of its impurity of choosing back control is≤5%;
6) carry out moulding: adding weight percent and be 2～5% wilkinites as caking agent, is the iron block that 98～95% steel-smelting sewage sludge uniform mixing post-treatment becomes needs with weight percent.
3. the method for utilizing steel-smelting sewage sludge to produce the steely iron piece as claimed in claim 2, it is characterized in that: described bentonitic performance index are: inhale blue amount: 23～38 grams/100 grams, colloid index 50～500 milliliters/5 grams, moisture (weight percent): 10～14%, granularity :-100 orders are (weight percent): 90～99%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468855A (en) * | 2013-09-30 | 2013-12-25 | 攀钢集团攀枝花钢钒有限公司 | Rotating furnace coolant, preparing method thereof and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468855A (en) * | 2013-09-30 | 2013-12-25 | 攀钢集团攀枝花钢钒有限公司 | Rotating furnace coolant, preparing method thereof and use method thereof |
| CN103468855B (en) * | 2013-09-30 | 2015-04-22 | 攀钢集团攀枝花钢钒有限公司 | Rotating furnace coolant, preparing method thereof and use method thereof |
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Application publication date: 20110126 |