CN1162647A

CN1162647A - Method for pelletizing hematite by cold process

Info

Publication number: CN1162647A
Application number: CN 96103680
Authority: CN
Inventors: 杨浚锦; 余兆禄; 王天德; 卢凤武; 吴志刚; 乔开明; 陈光碧; 房桂香
Original assignee: MINE AND METALLURGY GENERAL CO ESHAN YI AUTONOMOUS COUNTY
Current assignee: MINE AND METALLURGY GENERAL CO ESHAN YI AUTONOMOUS COUNTY
Priority date: 1996-04-13
Filing date: 1996-04-13
Publication date: 1997-10-22

Abstract

A cold concretion method for producing balls of brown hematite powder includes such steps as baking brown hematite powder, grinding, mixing with adhesive and making balls. The obtained balls feature high mechanical strength, uniform granularity, stable chemical components, good thermal blast nature and reduction properties, low cost, low energy consumption and less pollution.

Description

Method for pelletizing hematite by cold process

The invention belongs to the ironmaking technology field.Be specially adapted to the manufacturing of brown hematite breeze cold bound pellet.

Mining can produce a large amount of breezes inevitably, and particularly the brown hematite breeze is more, smelts only lump ore direct motion but throw stove, and breeze then is difficult to normally smelt.Therefore, greatly influence the economic benefit that mining must have, brought very big shortcoming for the reasonable utilization of natural resources particularly for people.So, how just can make breeze normally throw stove and smelt, a technical barrier that has just become naturalists to capture as early as possible.In recent years, the breeze agglomeration technology continues to bring out, and the name of publishing as " ironmaking " is called " research of unfired pellets and application " achievement; The name that " agglomerates of sintered pellets " published is called " about some problems of brown hematite sintering mineral powder " achievement.Patent application also is on the increase, and is 91105752 " shaft furnace process is produced the technology and the equipment of limonite pelletizing " as the application number of Jiangxi Province Pingxiang Iron ﹠ Steel Plant application; The application number of Nanjing, Jiangsu Province second Steel Plant application is 93115139 " method of low-temperature sintering rhombohedral iron ore, limonite breeze "; The application number of Jishan County Iron Works, Shanxi Prov.'s application is 88107798 " cold setting pellets of powdered iron concentrate manufacture method and equipment " or the like.

These achievements in research and patented technology have greatly been enriched the human repository of carrying out metallurgical work, for people rationally utilize natural resources fully, improve the metallurgical economic benefit of mining simultaneously and have made significant contribution.But up to now, scientific workers also still the end provide a kind of simple and easy to do relevant method for pelletizing hematite by cold process except that sintering process.

Purpose of the present invention just is to provide a kind of production method simple to society, reduced investment, energy consumption is low, the method for pelletizing hematite by cold process that smelting performance is good, thereby a large amount of brown hematite breezes can rationally fully effectively be utilized, improve the metallurgical economic benefit of mining.

Method for pelletizing hematite by cold process of the present invention is: (1), breeze is dried; (2), the breeze after will drying is levigate; (3), levigated breeze and binding agent are mixed in proportion; (4), refrigeration agglomerated pellet.

The inventive method has satisfied the needs that brown hematite breeze cold bound pellet is produced fully, compare with the particularly existing agglomerates of sintered pellets processing method of prior art that to have technology simple, energy consumption is low, less investment, the little characteristics of pollution, gained cold bound pellet good mechanical property, the ultimate compression strength height, the transportation and store very convenient, the pelletizing epigranular, substantially do not have powder, Chemical Composition is stable, and basicity is higher than rawore, reach half self-fluxing nature, it is Well-recovered to throw stove smelting thermal explosion, and the low temperature Pulverization ratio is low, and working of a furnace operation is smooth and easy.

Accompanying drawing one is the method for pelletizing hematite by cold process process flow sheet.

With reference to the accompanying drawings, we will do further concrete detailed description to method for pelletizing hematite by cold process.

Embodiment one

It is 1% that brown hematite breeze (1) drying machine (2) is dried water content; To dry breeze and carry out its granularity of fine grinding less than 1.5 millimeters, wherein account for more than 40% less than 200 purposes with ball mill (3); Add and to equal binding agent (4) 10% and fine grinding breeze that 6～8 to 4～2 mixed form with the fine grinding blast furnace granulated slag than slaked lime and mix with mixer (5); Then use balling disc (6) to make ball and get brown hematite breeze cold bound pellet (7).

Embodiment two

It is 2% that brown hematite breeze (1) drying machine (2) is dried water content; Breeze after the oven dry is carried out fine grinding with ball mill (3); Its granularity wherein accounts for more than 36% less than 200 purposes less than 2 millimeters, adds binding agent Portland blast (4) 8% (should illustrate that it also is very good that this binding agent adds 4%～12%) and mixes with mixer (5) with the fine grinding breeze; Then use balling disc (6) to make ball and get finished product brown hematite breeze cold bound pellet (7).

Embodiment three

Brown hematite breeze (1) drying machine (2) is dried water content less than 7%; Breeze after the oven dry is carried out fine grinding with ball mill (3); Its granularity wherein accounts for more than 30% less than 200 purposes less than 2.5 millimeters, adds to equal binding agent (4) 15% and fine grinding breeze that 6～8 to 4～2 mixed forms by the fine grinding blast furnace granulated slag than Portland blast and mix with mixer (5); Then use balling disc (6) to make ball and get finished product brown hematite breeze cold bound pellet (7).

Be noted that above-mentioned any one embodiment is not isolated, they all are the particular embodimenies of whole method for pelletizing hematite by cold process, such embodiment also can enumerate many, and the water content after specific targets that occur among each embodiment such as the breeze oven dry; Breeze granularity after the fine grinding; Ratio of binding agent and binding agent and fine grinding breeze or the like all can be intersected practical.In addition, the water content that will look when balling disc is made ball behind binding agent and the fine grinding breeze mixing adds suitable quantity of water, so that finished product brown hematite breeze cold bound pellet water content is between 8%～15%.

Claims

1, be the method for pelletizing hematite by cold process of raw material with binding agent and brown hematite breeze, it is characterized in that: the production method of brown hematite breeze cold bound pellet is: (1), the brown hematite breeze is dried; (2), the breeze after will drying is levigate; (3), breeze after levigate and binding agent are mixed in proportion; (4), refrigeration agglomerated pellet.

2, according to claims 1 described method for pelletizing hematite by cold process, it is characterized in that; Binding agent is to equal mixture that 6～8 to 4～2 mixed forms or Portland blast or equal the mixture that 6～8 to 4～2 mixed forms by the fine grinding blast furnace granulated slag than Portland blast than slaked lime by the fine grinding blast furnace granulated slag.

3, according to claims 2 described method for pelletizing hematite by cold process, it is characterized in that: the add-on of binding agent account for brown hematite breeze cold bound pellet dry bulb group heavy 4%～18%.

4, method for pelletizing hematite by cold process according to claim 3 is characterized in that: it is less than 7% that the brown hematite breeze will be dried water content.

5, method for pelletizing hematite by cold process according to claim 4 is characterized in that: oven dry back levigated breeze granularity wherein accounts for more than 30% less than 200 purposes less than 2.5 millimeters.

6, method for pelletizing hematite by cold process according to claim 5 is characterized in that: will add suitable quantity of water during the refrigeration agglomerated pellet, so that finished product brown hematite breeze cold bound pellet water content is between 8%～15%.