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A kind of composite calcium ferrite prepared by using red mud and stainless steel pickling sludge and its preparation method and application

A technology for compounding calcium ferrite and pickling sludge, applied in the field of metallurgy, can solve the problems of high price and high steelmaking cost, and achieve the effects of low production cost, low sulfur content and high conversion rate

Active Publication Date: 2022-07-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the calcium ferrite on the market is usually fired from iron concentrate powder and lime, the price is expensive, resulting in high steelmaking costs

Method used

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  • A kind of composite calcium ferrite prepared by using red mud and stainless steel pickling sludge and its preparation method and application
  • A kind of composite calcium ferrite prepared by using red mud and stainless steel pickling sludge and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Grind Bayer red mud, stainless steel pickling sludge and pure graphite powder from a domestic alumina enterprise, and pass through a 200-mesh sieve to take the undersize; according to the total Fe 2 O 3 : CaSO 4 : Calculate the molar ratio of C as 1.6:2:1, weigh 40g of Bayer red mud, 100g of stainless steel pickling sludge and 2.65g of graphite, mix with a mixer for 2 minutes, and press into a cylindrical block of D10mm×H10mm;

[0042] The cylindrical block was placed in a horizontal high temperature resistance furnace, heated to 1150°C at 5°C / min, kept for 4h in a protective atmosphere of Ar gas, and the solid phase was cooled to obtain composite calcium ferrite, including 80% Ca 2 Fe 2 O 4 and 15% Ca 2 FeAlO 5 , the total sulfur content in the product is 0.0169%.

Embodiment 2

[0044] Grind Bayer red mud, stainless steel pickling sludge and pure graphite powder from a domestic alumina enterprise, and pass through a 200-mesh sieve to take the undersize; according to the total Fe 2 O 3 : CaSO 4 Calculate the molar ratio of :C as 2:2:1, weigh 50g of Bayer red mud, 100g of stainless steel pickling sludge and 2.65g of graphite, mix with a mixer for 2 minutes, and press into a cylindrical block of D10mm×H10mm;

[0045] The cylindrical block was placed in a horizontal high temperature resistance furnace, heated to 1150°C at 5°C / min, kept for 3 hours under a protective atmosphere of Ar gas, and the solid phase was cooled to obtain composite calcium ferrite, including 82% Ca 2 Fe 2 O 5 and 12% Ca 2 FeAlO 5 , the total sulfur content in the product is 0.019%, but it has no substantial effect on the subsequent steelmaking desulfurization.

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Abstract

The invention provides a composite calcium ferrite prepared by using red mud and stainless steel pickling sludge and a preparation method and application thereof, belonging to the technical field of metallurgy. The present invention uses red mud as raw material, can utilize the iron oxide in the red mud to the maximum extent, and also contains a certain amount of alumina in the red mud, which can form a low melting point calcium aluminate phase, which is an excellent slagging agent and dephosphorization agent. The present invention adopts stainless steel pickling sludge as calcium supply agent, calcium sulfate in the pickling sludge can generate calcium oxide required for calcium ferrite preparation after high temperature roasting in reducing atmosphere, and the conversion rate of raw materials is high. Red mud and stainless steel pickling sludge are metallurgical solid wastes that are extremely difficult to treat at present. The present invention utilizes red mud and stainless steel pickling sludge to prepare high value-added composite calcium ferrite. The composite calcium ferrite can be used as a high-efficiency dephosphorization agent / fluxing agent in the molten steel smelting and refining process, and the effect is better than that of the expensive calcium ferrite in the market, and the preparation process is simple, the cost is low, and it has broad industrial application prospects.

Description

technical field [0001] The invention relates to a composite calcium ferrite prepared by using red mud and stainless steel pickling sludge, a preparation method and application thereof, and belongs to the technical field of metallurgy. Background technique [0002] Red mud is a solid waste produced by the alumina industry because its main component is Fe 2 O 3 , the color is red and named. About 1.8t of red mud is produced for every 1t of alumina produced in my country, and the current large-scale treatment of red mud is a world-class problem. [0003] Stainless steel pickling sludge is a solid waste precipitated by adding lime to wastewater produced by pickling in order to ensure surface smoothness in the production process of stainless steel. Because its Cr(VI) leaching exceeds the national standard, it is clearly classified as hazardous solid waste. thing. The main component of stainless steel pickling sludge produced with sulfuric acid as pickling medium is Fe 2 O 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/076C01G49/00
CPCC21C7/0645C21C7/076C01G49/00C01G49/009Y02P10/20
Inventor 张延玲赵峥许香帅余阚张威风
Owner UNIV OF SCI & TECH BEIJING
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