CN1746321A

CN1746321A - Composite globular mineral binder and production thereof

Info

Publication number: CN1746321A
Application number: CN 200410073892
Authority: CN
Inventors: 冯炎亮; 李长发
Original assignee: MINGLIANG IRON AND STEEL CO Ltd YICHENG
Current assignee: MINGLIANG IRON AND STEEL CO Ltd YICHENG
Priority date: 2004-09-08
Filing date: 2004-09-08
Publication date: 2006-03-15

Abstract

The invention is about the process to produce a compound agglomerant of spheric agglomeration that contains bovey coal80% and NaOH15%. The process is: (1)heat the mixture of the water and bovey coal(1: 2.5)to ebullience for 30min;(2)heat the mixture of the NaOH and the resin to ebullience for 30min, then add the mixture to the(1), heat the mixture for 30min again, so get the top pasty;(3) isotrope the pasty and press into the module under 20-30MPa, then to dry for 30-60mins in 100-300 Deg C.,last to polish.

Description

Composite globular mineral binder and production technique thereof

Technical field

The present invention relates to a kind of iron-smelting raw material high temperature oxidation roast unity pellet, particularly composite globular mineral binder and production technique thereof.

Background technology

At present, rotary hearth furnace is produced direct-reduced iron and is better than rotary kiln and shaft furnace technology greatly, is positioned at metallurgical technology forward position, the world.The raw material that enters rotary hearth furnace production must pass through scientific ingredients, batch mixing, just can be pressed into carbonaceous pelletizing then, therefore, the intensity of guaranteeing pressure ball balling ratio and pelletizing is to adopt rotary hearth furnace to produce the key of direct-reduced iron, and to reach the technology of pelletizing requirement, select to use binding agent most important, existing compound binding agent is that wilkinite and organic binder bond are combined, with the sodium bentonite is that base-material is allocated a certain amount of organic binder bond into, allocate the additive of a certain amount of increase pellet strength again into, could satisfy the needs that large blast furnace is smelted, but the additive that need allocate larger proportion into just can reach the intensity that improves pellet, so not only can cause waste, and reduced the bentonitic ratio of high-quality in the compound binding agent, influence has reduced the quality of compound binding agent, has reduced the pellet ferrous grade and has increased the pellet production cost.Chinese patent CN1229144A, open day on September 2nd, 1999, a kind of " composite globular mineral binder and processing method thereof " disclosed, mainly be that wilkinite is carried out sufficient sodium upgrading, the additive amount of allocating into is few, improve good sodium bentonite relatively and carry out sufficient sodium upgrading, the additive amount of allocating into is few, improve the ratio of good sodium bentonite relatively, reduce the compound binding agent proportioning of pellet compound, allocation ratio avoids waste for a short time, reduce ball consonance ore deposit roast temperature and reduce ball ore deposit production cost, improve the pellet ferrous grade, strengthen pellet strength, but how many pellet strengths improves, how many ferrous grades improves, how many pellet production costs reduces, and do not relate in the document, is difficult to make the people to convince; Chinese patent CN1120074A discloses a kind of " producing the directly method of reduction furnace charge with cold fixed briquetting method ", is to adopt the humate organic binder bond to produce cold bound pellet, has the not high wretched insufficiency of physical strength; And the cold bound pellet that generally adopts sodium silicate binder to produce in the prior art, as Chinese patent CN1056532A, a kind of " the cold fixed agglomeration process of bulk powder " disclosed, though this pelletizing has very high physical strength, but because water glass decomposes under the high temperature about 700 ℃, cause the high-temperature behavior of cold bound pellet very poor, therefore be difficult to be applicable to direct reduction shaft furnace and blast furnace production.

Summary of the invention

The purpose of this invention is to provide a kind of novel composite globular mineral binder and production technique thereof.

Composite globular mineral binder provided by the invention, its moiety (weight percent) is: brown coal 80%, sodium hydroxide 15%, resin 5%.

Production technique is:

1. in 1: 2.5 ratio water and brown coal are heated with stirring to boiling 30 minutes;

2. sodium hydroxide and resin were heated with stirring to boiling in the time of 30 minutes, during 1. beginning slowly joins; Restir was heated to boiling after 30 minutes, with top pasty state, removed and fell down bits then;

3. after above-mentioned pasty mixture being placed the mixing machine thorough mixing evenly, through the nodulizer compound stalk forming, the green briquette of compacting got final product down at 100-300 ℃ in dry 30-60 minute, wore away then with 30-30Mpa pressure, made finished product and used.

Major advantage of the present invention is:

1. binding agent is an alkalescence, is more suitable in direct reduction, and the reduction rate of pelletizing is obviously accelerated.

2. help desulfurization, sulphur content is reduced.

3. make the carbonaceous pelletizing dropping strength that contains and bring up to 7 times, improve 5 times than a balling-up, yield rate reaches 98%, about this pelletizing resistance to compression 3000N/, has satisfied the needs that rotary hearth furnace is produced, and can be widely used in the production of pellet.

4. use alkaline binding agent, it is extensive to make material, and cost is low, than using acid binding agent pelletizing cost per ton to be reduced to 600 yuan/ton by original 850 yuan/ton, economical and practical.

Embodiment

Choose 80 kilograms in brown coal, 15 kilograms in sodium hydroxide, 5 kilograms of resins, 32 kilograms in water.

Production technique is: 1. water and brown coal are heated with stirring to boiling 30 minutes; 2. then sodium hydroxide and resin were heated with stirring to boiling in the time of 30 minutes, during 1. beginning slowly joined, restir was heated to boiling after 30 minutes, with top pasty state, removed following bits; 3. after above-mentioned pasty mixture being placed the mixing machine thorough mixing evenly, through the nodulizer compound stalk forming, the green briquette of compacting get final product under 100-300 in dry 30-60 minute, wore away then, made the finished product use with 20-30Mpa pressure.

Claims

1. a composite globular mineral binder is characterized in that being made up of following substances in percentage by weight: brown coal 80%, sodium hydroxide 15%, resin 5%.

2. the production technique of the described binding agent of production claim 1 is:

2. sodium hydroxide and resin were heated with stirring to boiling in the time of 30 minutes, during 1. beginning slowly joins; Restir was heated to boiling after 30 minutes, with top pasty state, removed following bits;

3. with thorough mixing in the above-mentioned pasty state mixing machine evenly after, through the nodulizer compound stalk forming, the green briquette of die mould get final product under 100-300 in dry 30-60 minute, wore away then, made the finished product use with 20-30Mpa pressure.