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Method for efficiently recovering iron and phosphorus resources in phosphorus-containing steel slag

A phosphorus resource and steel slag technology, applied in the field of metallurgical resource recycling, can solve the problems of low utilization value of phosphorus resources, failure to realize the recovery and efficient utilization of iron and phosphorus in steel slag, and low phosphorus concentration, so as to promote resource utilization and reduce implementation costs. Inexpensive, high recycling accuracy effect

Pending Publication Date: 2022-05-13
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the existing steel slag dephosphorization method can realize the effective separation of phosphorus in steel slag to a certain extent, the converter steel slag dephosphorization technology has not realized the recovery and efficient utilization of iron and phosphorus in steel slag
This results in a lower concentration of phosphorus in the phosphorus-rich phase obtained after slag separation (P 2 o 5 <10%), thus making the utilization value of phosphorus resources obtained after separation low

Method used

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  • Method for efficiently recovering iron and phosphorus resources in phosphorus-containing steel slag
  • Method for efficiently recovering iron and phosphorus resources in phosphorus-containing steel slag
  • Method for efficiently recovering iron and phosphorus resources in phosphorus-containing steel slag

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Effect test

Embodiment 1

[0036] figure 1 Flow chart of the method for efficiently recovering iron and phosphorus resources in phosphorus-containing steel slag, according to figure 1 The process shown is to separate and recover iron and phosphorus resources from the five-element slag, where the composition of the five-element slag includes CaO, SiO 2 , FeO, P 2 o 5 , B 2 o 3, the sample obtained by sintering the five-element slag sample under air atmosphere is recorded as 0# slag, and the oxygen partial pressure is changed to 10-6 atm to obtain 1# sample, and on this basis, 6% B2O3 is added to the slag to obtain 2 # slag, the specific composition is as shown in Table 1.

[0037] Table 1. Composition of five-element simulated slag (wt.%)

[0038] CaO SiO 2

FeO P 2 o 5

B 2 o 3

1# 38.57 15.43 36 10 0 2# 34.29 13.71 36 10 6

[0039] The specific steps are as follows:

[0040] (1) will B 2 o 3 Mix it with phosphorus-containing simulated sla...

Embodiment 2

[0060] Based on the composition of steel slag in a certain factory, while changing the partial pressure of oxygen, adding SiO to the simulated slag 2 Obtain modified slag 1# (in slag), or add SiO to slag 2 with B 2 o 3 Get 2# slag, continue to add B 2 o 3 Get 3# slag. The composition of the modified slag is shown in Table 4.

[0061] Table 4. Simulated slag composition (wt%)

[0062] CaO SiO 2

FeO P 2 o 5

B 2 o 3

1# 30 24 36 10 0 2# 28.33 22.67 36 10 3 3# 27.22 21.78 36 10 5

[0063] The test steps are as follows:

[0064] (1) will B 2 o 3 Mix it with phosphorus-containing simulated slag, put it into a platinum crucible, and put it into a VTL-1700 tube furnace. The modifier content ranges from 6% to 8%;

[0065] (2) Pour argon into the furnace to control the partial pressure of oxygen to be less than 10 -4 atm. Control the temperature of the tube furnace to 1550°C and hold it for half an hour to ful...

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Abstract

The invention provides a method for efficiently recovering iron and phosphorus resources in phosphorus-containing steel slag, and belongs to the technical field of recycling of metallurgical resources. According to the method, firstly, the phosphorus-containing steel slag is subjected to slag modification, then heat treatment is adopted to enable a magnetic Fe3O4 phase and a calcium phosphate phase to selectively grow up, and finally, the steel slag subjected to heat treatment is magnetically recycled to achieve the purpose of efficiently recycling iron and phosphorus resources in the phosphorus-containing steel slag. The iron-containing concentrate and the phosphorus-containing concentrate separated by the method can be respectively used as raw materials for ironmaking and phosphate fertilizer preparation, and tailings can be directly returned to the inside of iron and steel enterprises for cyclic utilization, so that not only is the environmental load of steel slag solved, but also comprehensive utilization of resources is realized.

Description

technical field [0001] The invention belongs to the technical field of recycling of metallurgical resources, and in particular relates to a method for efficiently recycling iron and phosphorus resources in phosphorus-containing steel slag. Background technique [0002] Steel slag is the waste produced in the steelmaking process, and its discharge accounts for 15% to 20% of the crude steel output. Because steel slag contains more phosphorus and sulfur impurities, the grade of steel slag is low, making its utilization rate only about 20%. A large amount of accumulation of steel slag (accumulatively exceeding 500 million tons) not only occupies a large amount of land, but also causes great waste of metallurgical resources and environmental pollution. [0003] Compared with the external utilization of steel slag in metallurgical enterprises, a large number of experimental studies and theoretical analysis show that the internal reuse of steel slag is an ideal method. In the cur...

Claims

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Application Information

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IPC IPC(8): B09B3/35B09B3/40B09B3/70B09B5/00B03C1/02B03C1/30B03D1/008B03D1/016B09B101/55
CPCB09B3/00B09B5/00B03C1/02B03C1/30B03D1/016B03D1/008B03D2201/02B03D2201/06
Inventor 李军成李果轩邱锋管东梁金山王蓉钟艺曹玲玲郭长庆
Owner JIANGSU UNIV
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