Method for recycling converter slags

A converter steel slag, mass percentage technology, applied in the field of industrial waste slag recycling, can solve the problems of converter steel slag recycling, the lack of a better way to realize the utilization value, reducing the iron grade of sintered ore, and reducing the output of sintered ore, etc. , The effect of reducing the cost of iron making and low cost

Active Publication Date: 2011-09-28
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, converter steel slag is a product after high-temperature melting. The mineral activity in the slag is low, and it is difficult to form a liquid phase at the sintering temperature, which will reduce the output of sintered ore, and the iron content of converter steel slag is only about 15%. Iron grade
Therefore, there is still no better way to realize the recovery and utilization value of converter steel slag

Method used

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  • Method for recycling converter slags
  • Method for recycling converter slags
  • Method for recycling converter slags

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The chemical composition of the broken converter steel slag used in this example is shown in Table 1 at a melting rate of 115 tHM / h.

[0055] The chemical composition (mass percentage, %) of table 1 converter steel slag

[0056] chemical composition

TF

CaO

MgO

SiO2

P

Converter slag

17.8

41.12

8.04

9.06

0.74

[0057] In the case of not using converter steel slag, the content of P in molten iron produced by COREX is 0.084%. The upper limit of the P content in the molten iron in this embodiment is 0.10%. According to the formula [1]:

[0058] m Z (max)=(P L -P)×1000 / Z P [1]

[0059] (0.1-0.084)×1000 / 0.74=21.62kg

[0060] Calculate the maximum use quality M of converter steel slag Z (max)=21.62kg, in the present embodiment, the quality that uses converter steel slag is M Z , [M Z =20.85kg]≤[M Z (max)=21.62kg].

[0061] The composition (mass percentage, %) of auxiliary material ...

Embodiment 2

[0075] The chemical composition of the broken converter steel slag used in this example is shown in Table 4 at a melting rate of 146 tHM / h.

[0076] The chemical composition (mass percentage, %) of table 4 converter steel slag

[0077] chemical composition

TF

CaO

MgO

SiO2

P

Converter slag

17.8

41.12

8.04

9.06

0.74

[0078] In the case of not using converter steel slag, the content of P in molten iron produced by COREX is 0.092%. In this embodiment, the upper limit of P content in molten iron is 0.12%. According to the formula [1]:

[0079] m Z (max)=(P L -P)×1000 / Z P [1]

[0080] (0.12-0.092)×1000 / 0.74=37.84kg

[0081] Calculate the maximum use quality M of converter steel slag Z (max)=37.84kg, in the present embodiment, the quality that uses converter steel slag is M Z , [M Z =37.8kg]≤[M Z (max)=37.84kg].

[0082] The composition (mass percentage, %) of auxiliary material in the table 5COREX ...

Embodiment 3

[0095] At a melting rate of 130 tHM / h, see Table 7 for the chemical composition of the broken converter steel slag used in this example.

[0096] The chemical composition of table 7 converter steel slag (mass percentage, %)

[0097] chemical composition

TF

CaO

MgO

SiO2

P

Converter slag

22.15

48.05

6.7

10.10

1.74

[0098] In the case of not using converter steel slag, the content of P in molten iron produced by COREX is 0.076%. In this embodiment, the upper limit of P content in molten iron is 0.12%. According to the formula [1]:

[0099] m Z (max)=(P L -P)×1000 / Z P [1]

[0100] (0.12-0.076)×1000 / 1.74=25.29kg

[0101] Can calculate the maximum use quality M of converter steel slag Z (max)=25.29kg, in the present embodiment, the quality that uses converter steel slag is M Z , [M Z =25kg]≤[M Z (max)=25.29kg].

[0102] The composition (mass percentage, %) of auxiliary material in the table 8COREX ...

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Abstract

The invention discloses a method for recycling converter slags, comprising the following steps: first, separating remainder iron blocks and shot iron from converter slags by magnetic separation, crushing remaining converter slags to particles with particle size of 0.01-25mm by a crusher, then, screening crushed converter slags according to different particle fractions, selecting converter slags with particle size of 8-25mm to mix with coal, dolomite and silica uniformly, transmitting the mixture into a COREX melter-gasifier via a belt conveyer for feed mixture. The crushed converter slags comprise 10-25wt% TFe, 30-60 wt% CaO, 4-15wt% MgO, 5-25wt% SiO2 and 0-2wt% P. According to the invention, the use of limestone, dolomite and silica in COREX process is reduced, the ironmaking cost is reduced, and discharge capacity of CO2 is also reduced. The method has the advantages of simple technology, low cost, and efficient utilization of industrial waste residues.

Description

technical field [0001] The invention relates to a method for recycling industrial waste slag, in particular to a method for recycling converter steel slag. Background technique [0002] The metallurgical industry consumes a large amount of material resources and energy, and produces a large amount of solid waste. Metallurgical slag is the main solid waste in the metallurgical industry. Although there are already a series of slag utilization technologies that can recycle the slag, to a certain extent, it solves the outlet of the slag and the comprehensive utilization of resources, and also achieves certain economic and social benefits. But its overall utilization efficiency is not high, and the method of using and recycling needs further development and research. [0003] Converter slag is a by-product produced in the process of converter steelmaking, which not only contains a certain amount of iron, but also contains a certain amount of CaO, MgO, SiO 2 And TFe, has good ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04
CPCY02P10/20Y02W30/50
Inventor 赵晓岩李肇毅李建林金嘉王定宇李晓清况志华钱良丰熊林
Owner XINJIANG BAYI IRON & STEEL
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