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A kind of sodium humate binder solution for iron ore pellets and its preparation method and application

A technology of binder solution and sodium humate, which is applied in the field of metallurgical engineering materials, can solve the problem of low falling strength of green balls, achieve the effect of improving the strength of green balls, meeting industrial production, and improving the grade of total iron

Active Publication Date: 2016-04-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its dosage still reaches 0.5-1%, and for some hard-to-form nodular concentrates (such as specularite, some magnetite concentrates, hematite, etc.), sodium humate binder is used to replace bentonite, and the green balls fall The intensity is still low, 1-2 times / 0.5m
For different iron concentrate ore types, there are still some limitations in the application of sodium humate binder in the preparation of iron concentrate pellets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add CaCl to the sodium humate solution 2 Viscosity adjuster, the total weight of the adjuster accounts for 10wt% of the dry weight of sodium humate. Stir the obtained mixture evenly at normal temperature to obtain the adjusted sodium humate binder. Add this binder solution to 0.5wt% of the weight of the iron ore concentrate to the -200 mesh magnetite concentrate of 89.3%, mix evenly, and perform pretreatment after moistening and grinding to form pellets. The obtained green balls have a moisture content of 7.7%. The ball drop strength is 6.3 times / 0.5m, and the compressive strength is 18.3N / piece. The compressive strength of the preheated ball and the roasted ball is 636N / piece and 2643N / piece respectively, and the TFe grade of the finished ball is 63.99%.

Embodiment 2

[0028] Add AlCl to the sodium humate solution 3 , FeCl 3 , CaCl 2 and MgCl 2 The viscosity regulator formed by mixing, the total weight of the regulator accounts for 8wt% of the dry weight of sodium humate. Stir the obtained mixture evenly at normal temperature to obtain the adjusted sodium humate binder. Add this binder to 98.6% specularite at -200 mesh at a ratio of 0.8wt% of the weight of the iron concentrate, mix evenly, and perform pretreatment after moistening and grinding, and then pelletize. The ball drop strength is 5.2 times / 0.5m, and the compressive strength is 19.8N / piece. The compressive strength of the preheated ball and roasted ball is 489N / piece and 2581N / piece respectively, and the TFe grade of the finished ball is 66.81%.

Embodiment 3

[0030] Add Al to the sodium humate solution 2 (SO 4 ) 3 , Fe 2 (SO 4 ) 3 , MgSO 4The viscosity modifier formed by mixing, the total weight of the modifier accounts for 9wt% of the dry weight of sodium humate. Stir the obtained mixture evenly at normal temperature to obtain the adjusted sodium humate binder. Add this binder solution to 0.2wt% of the weight of the iron concentrate to the -200 mesh magnetite concentrate of 89.3%, mix evenly, and perform pretreatment after moistening and grinding to form pellets. The obtained green pellets have a water content of 7.6%. The ball drop strength is 6.8 times / 0.5m, and the compressive strength is 19.8N / piece. The compressive strength of the preheated ball and the calcined ball is 662N / piece and 2783N / piece respectively, and the TFe grade of the finished ball is 64.09%.

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Abstract

The invention discloses a sodium humate binder solution for iron ore pellets and its preparation method and application. The solute of the sodium humate binder solution is composed of sodium humate, sodium hydroxide and a viscosity regulator, and the solvent It is water, and the viscosity modifier is one or more of the soluble salts of Al3+, Fe3+, Ca2+, Mg2+. The preparation method is to dissolve sodium humate in NaOH solution, then add the viscosity modifier and stir evenly, Promptly obtained; the preparation method of this sodium humate binder solution is simple to operate and low in cost, and the prepared sodium humate binder solution is added in the iron ore concentrate during the pelletizing process of the iron ore pelletizing process, which can effectively It improves the strength of green pellets and the total iron grade of finished pellets, and has the characteristics of less consumption and is suitable for pelletizing various iron concentrates.

Description

technical field [0001] The invention discloses a sodium humate binder solution for iron ore pellets, a preparation method and application thereof, and belongs to the field of metallurgical engineering materials. Background technique [0002] Because of its good mechanical properties and high-temperature metallurgical properties, acid oxidized pellets can significantly improve the air permeability of the blast furnace charge column, and are considered to be high-quality raw materials necessary for the realization of the "concentrated charge" policy of the blast furnace and the optimization of the charge structure. Therefore, in recent years, major domestic iron and steel enterprises are vigorously developing the production of iron ore oxide pellets. For blast furnace ironmaking, the grade of TFe in the furnace charge is increased by 1%, the coke ratio is reduced by 2%, and the output can be increased by 3%. However, at present, most of the domestic pelletizing factories use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/244
Inventor 姜涛周友连张元波李光辉范晓慧黄柱成郭宇峰杨永斌李骞陈许玲彭志伟甘敏孙阳陈军苏子键游志雄刘兵兵刘臣
Owner CENT SOUTH UNIV
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