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Pellet and production method thereof

A production method and technology of pelletizing, applied in the field of pelletizing, can solve the problems of reducing the grade of pellets, affecting the strength and metallurgical properties of pellets, and achieving the effects of improving grade, reducing production cost, and reducing consumption

Active Publication Date: 2019-01-25
FUJIAN LONGKING DSDN ENGINEERING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of bentonite can easily reduce the grade of pellets and affect the strength and metallurgical properties of pellets

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0030] The present invention also provides a kind of preparation method of pellet, comprising the following steps:

[0031] a) mixing 2 to 4 parts by weight of desulfurization ash mixture and 96 to 98 parts by weight of iron-containing powder to form pellets to obtain green pellets;

[0032] The desulfurization ash mixture is composed of desulfurization ash and bentonite, and the content of the desulfurization ash in the desulfurization ash mixture is 5-30wt%;

[0033] b) Roasting the green pellets to obtain pellets.

[0034] In the preparation method provided by the invention, firstly, the desulfurized ash mixture and iron-containing powder are mixed and pelletized. Wherein, the specific components, specifications and dosage ratios of the desulfurized ash mixture and iron-containing powder have been introduced above, and will not be repeated here. In the present invention, the mixing and pelletizing is preferably carried out in two steps, that is, first mixing the desulfuri...

Embodiment 1

[0043] The method for adding desulfurization ash to produce iron ore pellets comprises the steps:

[0044] mixing the dried bentonite and desulfurization ash to obtain a desulfurization ash mixture; the content of the desulfurization ash in the mixture is 10wt%;

[0045] The obtained desulfurization ash mixture is ground and mixed to 200 mesh in a Raymond mill;

[0046] The ground desulfurization ash mixture and iron fine powder are mixed according to a certain proportion and stirred and mixed to obtain a pellet mixed raw material; wherein, the desulfurization ash mixture is 3 parts by weight, and the iron fine powder is 97 parts by weight;

[0047] The obtained pellet mixed raw materials are pelletized in a disc pelletizer and sieved to obtain qualified green pellets (diameter 8-16mm);

[0048] The obtained qualified green balls are preheated in the grate machine, then roasted in the rotary kiln, cooled in the ring, and finally the finished balls are put into storage; the pr...

Embodiment 2

[0050] The method for adding desulfurization ash to produce iron ore pellets comprises the steps:

[0051] mixing the dried bentonite and desulfurization ash to obtain a desulfurization ash mixture; the content of the desulfurization ash in the mixture is 15wt%;

[0052] The obtained desulfurization ash mixture is ground and mixed to 200 mesh in a Raymond mill;

[0053] The ground desulfurization ash mixture and iron fine powder are mixed according to a certain proportion and stirred and mixed to obtain a pellet mixed raw material; wherein, the desulfurization ash mixture is 3 parts by weight, and the iron fine powder is 97 parts by weight;

[0054] The obtained pellet mixed raw materials are pelletized in a disc pelletizer and sieved to obtain qualified green pellets (diameter 8-16mm);

[0055] The obtained qualified green balls are preheated in the grate machine, then roasted in the rotary kiln, cooled in the ring, and finally the finished balls are put into storage; the pr...

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Abstract

The invention belongs to the field of pellets, and particularly relates to a pellet and a production method thereof. The pellet comprises, by weight, 2-4 parts of desulfurized fly ash mixed materialsand 96-98 parts of iron-containing powder, the desulfurized fly ash mixed materials comprise desulfurized fly ash and bentonite, the desulfurized fly ash accounts for 5-30wt% of the total weight of the desulfurized fly ash mixed materials, and the raw materials are palletized and baked to prepare the pellet. According to the pellet, the desulfurized fly ash replaces part of bentonite to serve as production raw materials of the pellet, and the dosage of the bentonite can be reduced when correlative performances of fresh pellets are met, so that taste, strength and metallurgical performances ofthe pellet are improved. The desulfurized fly ash serves as production raw materials of the pellet, so that resource utilization of the industrial solid waste desulfurized ash is achieved, the problemof waste of land resources caused by land occupation due to long-term stacking of the desulfurized ash is solved, the production cost of the pellet is reduced, and the pellet more has more market competitiveness.

Description

technical field [0001] The invention belongs to the field of pellets, in particular to a pellet and a production method thereof. Background technique [0002] The desulfurization ash produced by the dry desulfurization process is mainly composed of calcium sulfite hemihydrate, calcium carbonate, calcium sulfate, slaked lime and fly ash and other fine solid powders, with low moisture content, which belongs to general industrial solid waste. In recent years, with the comprehensive promotion and application of dry desulfurization process in domestic thermal power plants, steel plants, circulating fluidized bed boilers and glass furnaces and other industrial fields, the by-product desulfurization ash has increased year by year, and the disposal and utilization of desulfurization ash has gradually become a problem. Especially in remote areas far from the city center, most of them are stacked in the open air and deep buried, which not only occupies land resources, but also pollute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/243
CPCC22B1/02C22B1/2406C22B1/243
Inventor 苗建志陈宏史国良赖毅强王军涛苏清发程东乐温明英卢茂源林敏
Owner FUJIAN LONGKING DSDN ENGINEERING CO LTD
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