Method for improving phosphorus efficient enriching effect in phosphorus-contained steel slag

A technology of enrichment and steel slag, which is applied to the improvement of process efficiency, fertilizer mixture, manufacturing converters, etc., can solve the problems of phosphorus content that requires steel slag waste heat to be unusable and low phosphorus content, so as to promote efficient migration, increase content, and content increased effect

Active Publication Date: 2019-06-18
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem that in actual production, due to the low phosphorus content in the phosphorus-rich phase, it cannot meet the phosphorus content requirements of phosphate fertilizers or additives, and the waste heat of steel slag cannot be used during the enrichment process. The use has laid the foundation to improve the economic benefits of iron and steel enterprises and reduce environmental pollution

Method used

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  • Method for improving phosphorus efficient enriching effect in phosphorus-contained steel slag
  • Method for improving phosphorus efficient enriching effect in phosphorus-contained steel slag
  • Method for improving phosphorus efficient enriching effect in phosphorus-contained steel slag

Examples

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Effect test

Embodiment 1

[0026]This method is used to treat high-basic phosphorus-containing slag after dephosphorization of a converter in a factory. The specific implementation process is as follows: (1) After the converter smelting and tapping is completed, a certain amount of SiO is added to the bottom of the special slag tank in advance during the high temperature steel slag tapping process. 2 Modifier, SiO 2 10% of the amount of slag produced by the modifier, and the basicity of the modified slag (CaO / SiO 2 ) is 1.5 to 2.0. The components of the original converter slag and modified slag after smelting in this plant are shown in Table 1; (2) After the high-temperature steel slag is poured into the special slag tank, the The steel slag temperature was controlled at 1500°C and kept for 30 minutes to ensure that the slag and the modifier fully melted and reacted; (3) Then the slag was cooled at a temperature drop rate of 5°C / min, and when the slag temperature dropped to 1360°C, the slag was Keep w...

Embodiment 2

[0033] This method is used to treat high-basic phosphorus-containing slag after dephosphorization of a converter in a factory. The specific implementation process is as follows: (1) After the converter smelting and tapping is completed, a certain amount of Al is added to the bottom of the special slag tank in advance during the high temperature steel slag tapping process. 2 o 3 Modifier, Al 2 o 3 15% of the amount of slag produced by the modifier. The composition of the original converter slag after smelting in this plant is shown in Table 3; (2) After the high-temperature steel slag is poured into the special slag tank, the The steel slag temperature is controlled at 1480°C and held for 30 minutes to ensure that the slag and the modifier are fully melted and reacted; (3) Then the slag is cooled at a temperature drop rate of 5°C / min, and when the slag temperature drops to 1350°C, the slag is kept warm 60min to fully promote 3CaO·P 2 o 5 The precipitation of phosphorus in ...

Embodiment 3

[0040] For other steel slags such as phosphorus-containing electric furnace slag and phosphorus-containing molten iron pretreatment slag produced in the iron and steel smelting process, the process method for highly efficient enrichment of phosphorus in phosphorus-containing slag in this embodiment is also applicable. Due to the different parameters such as slag type, slag composition, and phase properties, the control conditions such as the type of modifier, the amount of modifier added, the control temperature, the cooling rate, and the holding time are also different when using the slag treatment process.

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Abstract

The invention discloses a method for improving a phosphorus efficient enriching effect in phosphorus-contained steel slag, and belongs to the technical field of recycling of metallurgy industry wasteslag. After the smelting completion, and in the discharge process of high-temperature furnace slag, a certain quantity of modifying agents are fed at the bottom of a slag tank or along with liquid-state slag currents; the melting modification is performed on the liquid-state phosphorus-contained slag by using afterheat of the steel slag; then, the cooling speed of the furnace slag is controlled tofully guarantee full melting and reaction of the furnace slag and the modifying agents; when the temperature of the furnace slag is reduced to the phosphorus enriching temperature, the furnace slag is insulated to fully accelerate separation of 3CaO.P2O5; and the temperature of the furnace slag is lowered at a certain cooling speed to condense the furnace slag to realize efficient enrichment of phosphorus in the phosphorus-contained slag. The method has the following advantages: the adverse effects of incapability of meeting the requirements of higher phosphorus contents in phosphorus fertilizers or additives due to lower phosphorus content in phosphorus-enriched phases in actual production and incapability of utilizing the afterheat of the steel slag in the enriching process are overcome. The method is simple, reliable, high in operability and convenient to realize, prominently increases the P2O5 content in the phosphorus-enriched phases in the phosphorus-contained slag, and greatlyimproves the enriching effect of phosphorus in the phosphorus-contained slag.

Description

technical field [0001] The invention belongs to the field of metallurgical industry waste slag recycling, and in particular provides a method for improving the effect of high-efficiency enrichment of phosphorus in phosphorus-containing steel slag. Through this method, high-concentration enrichment of phosphorus in phosphorus-containing steel slag can be realized, which is phosphorus-containing steel slag. The separation and recovery of phosphorus resources in steel slag, the resource utilization of phosphorus-containing steel slag as phosphorus fertilizer, the reduction of land occupation and environmental pollution caused by the large amount of phosphorus-containing steel slag dumping, and the increase of economic benefits of iron and steel enterprises are all very important. role. Therefore, the present invention has important reference and guiding significance for efficient recycling of metallurgical industry waste slag, especially large amounts of phosphorus-containing ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C05G1/00
CPCY02P10/20
Inventor 林路何赛梁强吕岩杨利彬吴伟曾加庆
Owner CENT IRON & STEEL RES INST
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