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Method for improving compressive strength of alkaline pellets prepared from limestone

A technology of alkaline pellets and compressive strength, which is applied in the field of improving the compressive strength of alkaline pellets with limestone, and can solve problems such as affecting the compressive strength of pellets, increasing energy consumption, and excessive liquid

Pending Publication Date: 2021-07-23
铜陵博锋实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although increasing the roasting temperature within a certain range can increase the compressive strength of alkaline pellets with limestone, too high a temperature not only increases energy consumption, but also produces too much liquid phase, which affects the compressive strength of pellets instead.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for improving the compressive strength of alkaline pellets with limestone, comprising the steps of:

[0023] In the first step, add 2.5 parts by weight of anhydrous magnesium sulfate and 17.12 parts by weight of urea into deionized water, stir evenly, add 0.2 parts by weight of sodium polyacrylate, stir magnetically for 1 hour, and prepare a mixed solution, and then transfer the mixed solution to the reaction kettle , stirred at a constant speed at 150°C and reacted for 6 hours, cooled to room temperature after the reaction, filtered, washed, and dried to obtain the precursor, then placed the precursor in a muffle furnace, roasted at 500°C for 5 hours, and cooled to obtain Treated magnesium oxide;

[0024] In the second step, 0.5 parts by weight of processed magnesium oxide, 2.3 parts by weight of calcium oxide and 55 parts by weight of fine iron ore are uniformly mixed, pulverized and ground until the particle size is 1mm, and mixed ore powder is obtained;

...

Embodiment 2

[0029] A method for improving the compressive strength of alkaline pellets with limestone, comprising the steps of:

[0030] In the first step, add 2.8 parts by weight of anhydrous magnesium sulfate and 17.35 parts by weight of urea into deionized water, stir evenly, add 0.4 parts by weight of sodium polyacrylate, stir magnetically for 1 hour, and prepare a mixed solution, and then transfer the mixed solution to the reaction kettle , stirred at a constant speed at 150°C and reacted for 6 hours, cooled to room temperature after the reaction, filtered, washed, and dried to obtain the precursor, then placed the precursor in a muffle furnace, roasted at 500°C for 5 hours, and cooled to obtain Treated magnesium oxide;

[0031] In the second step, 1.0 parts by weight of processed magnesium oxide, 3.0 parts by weight of calcium oxide and 60 parts by weight of fine iron ore are uniformly mixed, pulverized and ground until the particle size is 3mm, and mixed ore powder is obtained;

...

Embodiment 3

[0036]A method for improving the compressive strength of alkaline pellets with limestone, comprising the steps of:

[0037] In the first step, add 3.0 parts by weight of anhydrous magnesium sulfate and 17.56 parts by weight of urea into deionized water, stir evenly, add 0.5 parts by weight of sodium polyacrylate, stir magnetically for 1 hour, and prepare a mixed solution, and then transfer the mixed solution to the reaction kettle , stirred at a constant speed at 180°C and reacted for 6 hours, cooled to room temperature after the reaction, filtered, washed, and dried to obtain a precursor, then placed the precursor in a muffle furnace, roasted at 550°C for 5 hours, and cooled to obtain Treated magnesium oxide;

[0038] In the second step, 2.0 parts by weight of processed magnesium oxide, 3.5 parts by weight of calcium oxide and 70 parts by weight of fine iron ore are uniformly mixed, pulverized and ground until the particle size is 5mm, and mixed mineral powder is obtained;

...

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PUM

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Abstract

The invention discloses a method for improving the compressive strength of alkaline pellets prepared from limestone. The method comprises the following steps that 1, treated magnesium oxide is prepared; 2, mixed mineral powder is prepared; and 3, a roasted material is prepared and pelletized, prepared green pellets are screened and roasted, and the use amount of adhesive bentonite is controlled to be 1%-2.5% of the weight of the roasted material. Magnesium oxide is subjected to primary treatment, so that magnesium oxide has high porosity, oxygen can enter the pellets through pores in the oxygen enrichment process, oxidation of iron ore particles is improved, the compressive strength of the pellets is improved, and the technical problems that the compressive strength of the alkaline pellets prepared from the limestone can be improved by increasing the roasting temperature within a certain range, but energy consumption is increased by the too high temperature, and the compressive strength of the pellets is affected due to the fact that excessive liquid phases are generated are solved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, in particular to a method for increasing the compressive strength of alkaline pellets mixed with limestone. Background technique [0002] Pellets are one of the main raw materials for blast furnace ironmaking. At present, ordinary acid pellets are mainly produced in the market. Acid pellets are pellets of natural alkalinity, SiO 2 and Al 2 o 3 The content of other elements is relatively high, while the content of alkaline substances such as calcium and magnesium is low, so it can only be used in conjunction with high-basic sintered ore in blast furnaces. Pellets with binary alkalinity above 0.6% are called alkaline pellets. Alkaline pellets have the advantages of high reducibility and good droplet performance, but it is difficult to improve the compressive strength of alkaline pellets, especially with the increase of alkalinity, the compressive strength of alkaline pellets de...

Claims

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Application Information

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IPC IPC(8): C22B1/243
CPCC22B1/2406C22B1/243
Inventor 何飞
Owner 铜陵博锋实业有限公司
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