CN104988308B

CN104988308B - Iron ore pellets richness iron compound binding agent and preparation method and purposes

Info

Publication number: CN104988308B
Application number: CN201510363539.8A
Authority: CN
Inventors: 许满兴; 陈海勇; 张玉兰; 王硕; 孙英杰
Original assignee: Beijing New Bai Ao Technology Co Ltd
Current assignee: Beijing New Bai Ao Technology Co ltd
Priority date: 2015-06-26
Filing date: 2015-06-26
Publication date: 2018-04-17
Anticipated expiration: 2035-06-26
Also published as: CN104988308A

Abstract

It is 100 that the present invention, which provides iron ore pellets richness iron compound binding agent and preparation method and purposes, the iron ore pellets richness iron compound binding agent, including mass ratio,:1-10 iron cement and tackifier, wherein the tackifier are carboxymethyl cellulose, all iron content is 35~40wt%, (SiO in the richness iron compound binding agent₂+Al₂O₃) content be≤25wt%.The rich iron compound binding agent of the present invention, the cementation to iron ore pellets is realized using the dual cohesive action of the sodium metasilicate in iron cement and tackifier substitution bentonite, while can reduce (SiO₂+Al₂O₃) content, improve the balling property of Iron Ore Powder, improve the drop strength and compression strength of green-ball, achieve the purpose that to improve finished ball quality.Furthermore, it is possible to the totle drilling cost for substantially reducing binding agent solves the environmental issue of iron cement at the same time.

Description

Iron ore pellets richness iron compound binding agent and preparation method and purposes

Technical field

The present invention relates to a kind of iron ore pellet binder, and in particular to a kind of iron ore pellets richness iron compound binding agent, belongs to Field of metallurgy.

Background technology

Iron Ore Powder pelletizing production both at home and abroad at present, substantially makees binding agent using bentonite, and bentonitic primary chemical Component is (SiO₂+Al₂O₃).Table 1 is the main several bentonitic chemical compositions (%) in China, as it can be seen from table 1 bentonite In (SiO₂+Al₂O₃) content average value reach 83.60%, Fe₂O₃Content average out to 1.84%, conversion help containing for iron Amount is only 1.29%, therefore bentonitic main component is all the component of blast furnace ironmaking clinker.So production of Iron concentrate pelletizing Bentonite in journey often with addition of 1% makees binding agent, will reduce the ferrous grade 0.65% of pellet, increases SiO₂Content 0.65%, not only cause the quality of finished ball nodulizing to decline, also add pig iron cost.Although China's pellet is produced with addition of swollen Profit soil is reduced to 1.84% in 2014 from 3.42% in 2001, but in actual production many enterprises also more than 2% with addition of Amount, causes huge economic loss to country every year.

The main several bentonitic chemical compositions (%) in 1. China of table

In recent years, domestic Jianping, Liaoning Province Hui Ying Chemical Co., Ltd.s developed bentonite compound binding agent, with addition of ratio 1.2% can be reduced to, wherein bentonite accounts for more than 1.0%, or ferrous grade and SiO to pellet₂Content causes larger Influence.The production of ball body of powder of iron ore nodulizing needs to reduce the ferrous grade of finished ball and increase SiO as few as possible₂Content, but as long as Binding agent is made using bentonite, just inevitably significantly reduces the ferrous grade and increase SiO of finished ball nodulizing₂Contain Amount.Therefore study and invention iron content is high and contains (SiO₂+Al₂O₃) low pellet binder has great economic value.

The content of the invention

Based on problems of the prior art, the present invention provides a kind of iron ore pellets richness iron compound binding agent, using iron Mud and carboxymethyl cellulose tackifier are combined, and are substituted using the dual cohesive action of the sodium silicic acid in iron cement and tackifier swollen Profit soil, realizes the cementation to Iron Ore Powder pelletizing, and reaches improve finished pellet ferrous grade and reduction (SiO at the same time₂+ Al₂O₃) effect.

Technical scheme：

Iron ore pellets richness iron compound binding agent, it is characterised in that including mass ratio be 100:After 1-10 drying grinding All iron content in iron cement and carboxymethyl cellulose, wherein iron cement is 30~40wt%, (SiO₂+Al₂O₃) content for≤ 25wt%, the iron cement water content after drying, grinding are less than 5%.

The particle that the granularmetric composition of iron cement after the drying grinding is preferably less than 200 mesh is more than 95%.

The initial water content ＞ 25wt% of the iron cement, granularity are less than 140 mesh.

The purposes of above-mentioned iron ore pellets richness iron compound binding agent, it is characterised in that be used as the bonding of iron ore pellets production Agent.

The preparation method of above-mentioned iron ore pellets richness iron compound binding agent, it is characterised in that comprise the following steps：

Iron cement is dried to aqueous ＜ 5wt% first, it is to be more than 95% less than 200 purposes then to carry out being finely ground to granularity, Then the iron cement that drying and fine grinding are handled is mixed into uniformly with the carboxymethyl cellulose, obtains the iron ore pellets richness iron Compound binding agent.

The preferably iron cement described in fine grinding in Raymond mill.

A kind of processing method of iron ore pellets, it is characterised in that above-mentioned iron ore pellets richness iron compound binding agent, Iron Ore Powder Pelletizing is 0.8%~1.2% with addition of the ratio of the rich iron compound binding agent.

The granularmetric composition of the preferable Iron Ore Powder accounts for 60%~90% for the Iron concentrate less than 200 mesh.

The technique effect of the present invention：

A kind of iron ore pellets richness iron compound binding agent of the present invention, is increased using the sodium silicic acid in iron cement and carboxymethyl cellulose The dual cohesive action substitution bentonite of stick realizes the cementation to iron ore pellets, while can reduce in iron ore pellets (SiO₂+Al₂O₃) content, improve the balling property of Iron Ore Powder, improve the drop strength and compression strength of green-ball, reach improvement into The purpose of product ball quality.Furthermore it is possible to substantially reduce the totle drilling cost of binding agent, while solves the environmental issue of iron cement.

It is in iron ore pellets production using the advantages of rich iron compound binding agent：

First：The ferrous grade of finished pellet can be effectively improved, with addition of 1% rich iron compound binding agent than with addition of 2% Bentonite, which can improve finished ball ferrous grade 0.7%, (when Iron concentrate price is 500 yuan/ton of balls, can reduce pelletizing production cost 6.30 yuan/ton of balls).

Second：The SiO of pellet can effectively be reduced₂Content, to substitute 2% bentonite with addition of 1% rich iron compound binding agent When, the SiO of finished ball nodulizing 1.20% can be reduced₂Content, this can improve the high temperature metallurgical properties and drop of finished ball nodulizing The quantity of slag of low blast furnace ironmaking, so as to reduce fuel ratio (the blast furnace ironmaking statistics of blast furnace ironmaking：Furnace charge SiO₂Containing increase by 1%, The quantity of slag increases 50kg/t iron, and the 100kg quantity of slag will influence blast furnace fuel ratio and each 3.5%) of yield and reduce ironmaking cost.

3rd：Low with addition of ratio, Iron Ore Powder pelletizing is 0.8%~1.2% with addition of the ratio of rich iron compound binding agent, is less than The whole nation is at present with addition of 1.84% bentonite ratio.

4th：Suitable for the Iron concentrate of the mesh of granularmetric composition -200 60%~90%, applicable graininess scope is wide.

Embodiment

In order to which present disclosure is expressly understood, will be described further by specific embodiment.

According to investigations, iron cement is industry byproduct, and annual output is bigger, it is annual in Shandong Province of China and Shanxi Province have 50~ 800000 tons of amount, engineering price are very cheap.Since iron cement belongs to resource regeneration environment-friendly engineering, how effective, environmentally friendly land productivity It is great to environment protection significance with iron cement.

The embodiment of the present invention has selected a kind of iron cement, and wherein ferrous grade is 30~40wt%, (SiO₂+Al₂O₃) content ＜ 25%, water content are 30wt% or so, and granularity is less than 140 mesh.

The step of preparing iron ore pellets richness iron compound binding agent using this iron cement raw material is as follows：

The iron cement of the low silicon of iron content is dried first and fine grinding is processed, is 4.5% by being dried to moisture, then add - 200 mesh ＞ 95% will be finely ground to by entering Raymond mill, be improved its cohesive action, be obtained the iron cement of Fu Tie；

Second step is that the carboxymethyl cellulose that 5wt% is incorporated in the iron cement after drying fine grinding is uniformly mixed iron ore ball The compound adhesive of the rich iron of group, its chemical composition are listed in table 2.

From table 2 it can be seen that the compound adhesive all iron content of the rich iron prepared in the present embodiment is high, it is 35 ± 3.0wt%, And (SiO₂+Al₂O₃) content be 25%, far below more than the 80% (SiO contained in bentonite₂+Al₂O₃).Therefore, relatively The compound adhesive iron content of rich iron in swelling great soil group binding agent in the prior art, the present embodiment is high, siliceous, aluminium is low, and granularity is small, Belong to iron content fine powder.

Rich iron compound binding agent obtained above is subjected to ball test to the pelletizing Iron concentrate of Tang Gang and elder brother's steel.With addition of than Example is 1.0%, i.e., Iron concentrate per ton matches somebody with somebody 10kg, and the green-ball created just can fully meet quality requirement, the compression strength of green-ball 10 newton of ＞, drop strength ＞ 5 times, anti-burst temperature are higher than 600 DEG C.Under the conditions of Tang Gang, calculated by economy, pelletizing production Make binding agent compared with the bentonite with addition of 1.9% with addition of 1.0% rich iron compound binding agent, pellet per ton can reduce cost 9.21 Member/t balls.Under the conditions of elder brother's steel, by experiment and economic measuring and calculating, pelletizing production is using 1.0% rich iron compound binding agent substitution mesh Preceding makees binding agent with addition of 3.2% bentonite, and production ton pellet can reduce by 44.35 yuan/t of cost.

The chemical composition (%) of the rich iron compound binding agent of table 2.

By two Case Experiments On As of above Tang Gang and elder brother's steel and comparative example experiment and measuring and calculating, illustrate iron ore pellets of the invention Rich iron compound binding agent is produced for China's pellet, is had great technological achievement and economic value, can be improved pellet Ferrous grade and reduce finished ball SiO₂Content, and the input cost of pellet production can be significantly reduced.

The foregoing is merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in, It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims Subject to enclosing.

Claims

1. iron ore pellets richness iron compound binding agent, it is characterised in that including mass ratio be 100:Iron after 1-10 drying grinding Mud and carboxymethyl cellulose, not comprising bentonite, the wherein all iron content in iron cement is 30~40wt%, (SiO₂+Al₂O₃) Content is≤25wt%, and the iron cement water content after drying, grinding is less than 5%, the granularmetric composition of the iron cement after the drying grinding To be more than 95% less than the particle of 200 mesh.

2. iron ore pellets richness iron compound binding agent according to claim 1, it is characterised in that the initial aqueous of the iron cement ＞ 25wt% are measured, granularity is less than 140 mesh.

3. the purposes of the iron ore pellets richness iron compound binding agent described in claim 1 or 2, it is characterised in that be used as iron ore pellets life The binding agent of production.

4. the preparation method of the iron ore pellets richness iron compound binding agent described in claim 1 or 2, it is characterised in that including following step Suddenly：

Iron cement is dried to aqueous ＜ 5wt% first, it is to be more than 95% less than 200 mesh then to carry out being finely ground to granularity, then will Drying and the iron cement of fine grinding processing are mixed into uniformly with the carboxymethyl cellulose, and it is compound viscous to obtain the iron ore pellets richness iron Tie agent.

5. preparation method according to claim 4, it is characterised in that the iron cement described in fine grinding in Raymond mill.

6. a kind of processing method of iron ore pellets, it is characterised in that the iron ore pellets richness iron described in usage right requirement 1 or 2 is compound Binding agent, Iron Ore Powder pelletizing are 0.8%~1.2% with addition of the ratio of the rich iron compound binding agent.

7. according to the method described in claim 6, it is characterized in that the granularmetric composition of the Iron Ore Powder is the iron essence less than 200 mesh Powder accounts for 60%~90%.