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Preparation method of high-calcium aluminum residue balls

A technology of aluminum slag balls and high calcium, which is applied in the field of molten steel refining and slag adjustment, can solve the problems of large air pollution and high cost of pure aluminum, and achieve the effects of good surface stability, high raw material utilization rate, and improved quality

Inactive Publication Date: 2018-06-01
天津基纳科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although this composite deoxidizer can solve the problem of high cost of using pure aluminum, it has the following disadvantages: in the process of making the deoxidizer, the barium sulfate contained in the barite will combine with the carbon in the coke powder or coal at 600°C The reaction produces SO X gas, air pollution

Method used

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  • Preparation method of high-calcium aluminum residue balls
  • Preparation method of high-calcium aluminum residue balls

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of high-calcium aluminum slag balls, comprising the following steps:

[0038] S1: Take 100kg of bauxite and pour it into the first reaction tank, add hydrochloric acid to the first reaction tank to submerge the bauxite, and soak for 4 hours, the Al in the bauxite 2 o 3 The content is 70wt%, and the concentration of hydrochloric acid is 5mol / L;

[0039] S2: Filter the solution in the first reaction tank and transfer it to the second reaction tank, and pass ammonia gas into the solution in the second reaction tank until the pH of the solution reaches 7;

[0040] S3: Pump out the solution in the second reaction tank and dry it in a reaction kettle with a pressure of 4kPa and a temperature of 30°C for 2 hours to obtain NH 4 Cl crystallization;

[0041] S4: Take out the solid in the second reaction tank and put it into a stirring pot, add 100kg of limestone, stir evenly, move it to a high-temperature reaction furnace, and calcinate at a temperature of...

Embodiment 2

[0046] A preparation method of high-calcium aluminum slag balls, comprising the following steps:

[0047] S1: Take 110kg of bauxite and pour it into the first reaction tank, add hydrochloric acid to the first reaction tank to submerge the bauxite, and soak for 4 hours, the Al in the bauxite 2 o 3 The content is 68wt%, and the concentration of hydrochloric acid is 5.3mol / L;

[0048] S2: filter the solution in the first reaction tank and transfer it to the second reaction tank, and pass ammonia gas into the solution in the second reaction tank until the pH of the solution reaches 7.5;

[0049] S3: Pump out the solution in the second reaction tank and dry it in a reaction kettle with an air pressure of 3.5kPa and a temperature of 28°C for 2.5 hours to obtain NH 4 Cl crystallization;

[0050] S4: Take out the solid in the second reaction tank and put it into the stirring pot, add 105kg of limestone, stir evenly, move it to a high-temperature reaction furnace, and calcinate at 9...

Embodiment 3

[0055] A preparation method of high-calcium aluminum slag balls, comprising the following steps:

[0056] S1: Take 98kg of bauxite and pour it into the first reaction tank, add hydrochloric acid to the first reaction tank to submerge the bauxite, and soak for 4 hours, the Al in the bauxite 2 o 3 The content is 72wt%, and the concentration of hydrochloric acid is 4.8mol / L;

[0057] S2: Filter the solution in the first reaction tank and transfer it to the second reaction tank, and pass ammonia gas into the solution in the second reaction tank until the pH of the solution reaches 7;

[0058] S3: Pump out the solution in the second reaction tank and dry it for 3 hours in a reaction kettle with an air pressure of 4.5kPa and a temperature of 35°C to obtain NH 4 Cl crystallization;

[0059] S4: Take out the solid in the second reaction tank and put it into a stirring pot, add 95kg of limestone, stir evenly, move it to a high-temperature reaction furnace, and calcinate at a tempera...

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Abstract

The invention relates to a preparation method of high-calcium aluminum residue balls. The preparation method comprises the steps of 1, soaking bauxite in hydrochloric acid for 3-5 hours; 2, conductingsolid-liquid separation on substances formed in step 1, and introducing ammonia gas into obtained liquid till PH of a solution reaches 7-7.5; 3, drying the liquid obtained in step 2 for 2-3 hours inthe environment with the air pressure being 3.5-4.5 kPa and the temperature being 25-35 DEG C, so that NH4Cl crystals are obtained; 4, adding limestone to solid obtained in step 2, and after the materials are stirred uniformly, conducting calcination for 2-2.5 hours at the temperature of 890-920 DEG C, wherein the weight ratio of the bauxite to the limestone is 1: (0.95-1); 5, adding coke powder and barium carbonate to solid obtained in step 4, and fully stirring the materials to be uniform, wherein the weight ratio of the bauxite to the coke powder is 1: (0.12-0.145), and the weight ratio ofthe bauxite to the barium carbonate is 1: (0.015-0.02); 6, heating materials formed in step 5 to 1500-1550 DEG C in a vacuum environment, conducting calcination for 1.5-2 hours, and conducting negative pressure extraction in the calcination process; and 7, pouring molten materials obtained in step 6 into a mold, and delivering the materials out of the mold after the materials are cooled. By meansof the preparation process, no SOX is generated; and the obtained high-calcium aluminum residue balls are stable in surface and good in outward appearance.

Description

technical field [0001] The invention relates to the technical field of molten steel refining and slag adjustment, and more specifically, it relates to a preparation method of high-calcium aluminum slag balls. Background technique [0002] At present, the traditional method of steelmaking plants in the domestic metallurgical industry is to add pure aluminum, aluminum ingots or aluminum wires in the process of smelting molten steel. Reduce the oxygen content in the steel to the required range. But its disadvantage is that the cost of pure aluminum is too high, and the aluminum content is too high, and its reactant Al 2 o 3 It is a fine solid particle, which tends to adhere to the nozzle surface and molten steel in the next process, and the product Al 2 o 3 Supersaturated precipitation can cause nodules to form blockage at the continuous casting nozzle, and the common problem of flocculation in the tundish makes the pouring of molten steel forced to be interrupted. Due to ...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/076C21C7/00
CPCC21C7/00C21C7/0006C21C7/06C21C7/076Y02P10/20
Inventor 齐龙飞齐龙威
Owner 天津基纳科技发展有限公司
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