CN104446032A - Technology for producing S75-level steel and iron slag powder - Google Patents

Abstract

The invention discloses a technology for producing S75-level steel and iron slag powder. The technology comprises steps as follows: a, steel and iron slag with the screen residue with the fineness of 5 mm being decreased to 5% from being smaller than or equal to 15% according to the steel and iron slag purchase standard is selected, and 80 parts of the steel and iron slag, 9.43 parts of MgO and 0.83 parts of SO3, by weight, are mixed; b, in the proportion, a wide-neck discharging bin is used and vibrated, meanwhile, granulated blast-furnace slag and the steel and iron slag are added to a vertical mill, and cement is produced with a vertical mill grinding technology. The technology for producing the S75-level steel and iron slag powder can overcome defects that the production cost is high, the production technology is complex, the ratio is unreasonable and the like in the prior art and has the advantages that the production cost is low, the production technology is simple and the ratio is reasonable.

Description

A kind of technique of producing S75 level iron and steel ground-slag

Technical field

The present invention relates to cement processing technique field, particularly, relate to a kind of technique of producing S75 level iron and steel ground-slag.

Background technology

Companies ask slag vertical-mill is mixed steel slag and is produced iron and steel ground-slag, to reduce the use to granulated blast-furnace slag; It is sufficient that investigation finds that current Liuzhou periphery piles the steel slag starting material after having a large amount of deironing, and the procurement price of the grand slag of plum wants cheap a lot of relative to granulated blast-furnace slag procurement price, can reduce production cost.

Note: 1., iron and steel ground-slag is with steel slag and granulated blast-furnace slag etc. for main raw material, and grinding becomes the powder of certain fineness by a certain percentage; 2., steel slag is product adjoint in smelt production, if not in time effectively process can cause and strive ground with agriculture, silt river up, contaminate environment, slag completely for suffering from, even affects STEELMAKING PRODUCTION.

Country iron and steel ground-slag standard GB/T 28293-2012 issued on May 11st, 2012, and started formal execution on February 1st, 2013; South, Xinyu building materials company 2 phase breeze technology innovation project---produce 400000 t iron and steel ground-slag production lines per year and test-manufacture successfully, this is that China's designed, designed unit production capacity is maximum, Jiangxi Province's first bar iron and steel ground-slag production line.Utilizing steel slag to produce iron and steel ground-slag has at present been a kind of comparatively ripe production technique, and the application of steel slag in cement production process and in concrete gets the nod.

Realizing in process of the present invention, contriver finding at least to exist in prior art that production cost is high, complex manufacturing and the defect such as proportioning is unreasonable.

Summary of the invention

The object of the invention is to, for the problems referred to above, propose a kind of technique of producing S75 level iron and steel ground-slag, to realize, production cost is low, production technique simple and the advantage of reasonable ratio.

For achieving the above object, the technical solution used in the present invention is: a kind of technique of producing S75 level iron and steel ground-slag, comprising:

A, select steel slag procurement criteria by original 5mm tail over≤15% drop to 5% steel slag, by this steel slag, MgO and SO ₃by following parts by weight proportioning:

Steel slag: 80 parts;

MgO:9.43 part;

SO ₃: 0.83 part;

B, according to the above ratio, use wide mouth blanking bin, wide mouth blanking bin is shaken; Meanwhile, granulated blast-furnace slag and steel slag are added vertical mill, produce cement by vertical mill grinding technical matters.

Further, described in step b, use wide mouth blanking bin, to the operation that wide mouth blanking bin shakes, specifically comprise:

Widen feed opening, and set up material baffle, prevent material from trickling down;

While blanking, blanking bin is shaken.

The technique of the production S75 level iron and steel ground-slag of various embodiments of the present invention, owing to comprising: a, select steel slag procurement criteria by original 5mm tail over≤15% drop to 5% steel slag, by this steel slag, MgO and SO ₃by following parts by weight proportioning: steel slag: 80 parts; MgO:9.43 part; SO ₃: 0.83 part; B, according to the above ratio, use wide mouth blanking bin, wide mouth blanking bin is shaken; Meanwhile, granulated blast-furnace slag and steel slag are added vertical mill, produce cement by vertical mill grinding technical matters; Thus can overcome that production cost in prior art is high, complex manufacturing and the irrational defect of proportioning, to realize, production cost is low, production technique simple and the advantage of reasonable ratio.

Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification sheets, or understand by implementing the present invention.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the check result figure of technical solution of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

According to the embodiment of the present invention, as shown in Figure 1, provide a kind of technique of producing S75 level iron and steel ground-slag, comprising:

A, select steel slag procurement criteria by original 5mm tail over≤15% drop to 5% steel slag, by this steel slag, MgO and SO ₃by following parts by weight proportioning:

Steel slag: 80 parts;

MgO:9.43 part;

SO ₃: 0.83 part;

B, according to the above ratio, use wide mouth blanking bin, wide mouth blanking bin is shaken; Meanwhile, granulated blast-furnace slag and steel slag are added vertical mill, produce cement by vertical mill grinding technical matters;

Use wide mouth blanking bin in step b, to the operation that wide mouth blanking bin shakes, specifically comprise:

Widen feed opening, and set up material baffle, prevent material from trickling down;

While blanking, blanking bin is shaken.

In the inventive solutions, utilize 4# line to produce the Vertical Mill production unit of breeze, mix a large amount of steel slags produce iron and steel ground-slag by adjustment production technique, optimization production proportioning.

the target setting of technical solution of the present invention:the S75 level iron and steel ground-slag that production conformance with standard requires: leading indicator: steel slag volume>=20% and≤50%, A7>=55, A28>=75.Note: A7=(50% iron and steel ground-slag+50% base mud) 7 days ultimate compression strength/100% base cement 7 days ultimate compression strength x100%; A28=(50% iron and steel ground-slag+50% base mud) 28 days ultimate compression strength/100% base cement 28 days ultimate compression strength x100%.

the formulation preferred plan of technical solution of the present invention:carried out laboratory test for how mixing steel slag, and the result of experimentally room test is produced in practice, proposes multiple technologies scheme, arranges as follows as a trial:

(1) laboratory test:

1, we in testing laboratory for steel slag self character, the comparative study performance difference of steel slag and granulated blast-furnace slag:

(1) raw-material performance difference is as following table:

starting material total analysis

Fe as seen from the above table in steel slag ₂o ₃content considerably beyond the content in granulated blast-furnace slag, Fe ₂o ₃a kind of mineral of more difficult grinding, when controlling certain specific surface area, larger on impact during production platform:

little mill activation analysis is played by identical specific surface area

As can be seen from Table 3, comparatively granulated blast-furnace slag difference is comparatively large for the activity of steel slag own, and namely the activity of iron and steel ground-slag can reduce with the increasing of steel slag incorporation

(2) the little mill test of steel slag is mixed:

Along with the incorporation of iron and steel ground-slag increases, the activity of iron and steel ground-slag reduces thereupon, and when steel slag volume reaches 40%, the iron and steel ground-slag A7 activity of producing is 53.8, lower than A7 >=55.0 that standard S75 iron and steel ground-slag requires.

2, actual production test

The guidance test of room by experiment, the large mill production test of being correlated with.

(1) research mixes the grand slag of plum of different amount to the impact of activity:

As seen from the above table, in Vertical Mill actual production, when production control specific surface area is 450, when steel slag mixes 50%, still can produce the S75 iron and steel ground-slag meeting standard-required.

Vertical Mill unit-hour output sharply reduces along with the increase of steel slag volume, and during platform, the minimizing of volume directly will improve per-unit production energy consumption, increases production cost.

Group member sits on, and considers the unstable in actual production, and the Active pharmaceutical of iron and steel ground-slag needs certain having more than needed, so the productive capacity of iron and steel ground-slag is decided to be by we: steel slag volume is decided to be 40%, specific surface area Con trolling index is 450 ± 10.

In this large mill production process, group member's meeting sums up Problems existing in actual production process, and concrete to affect situation as follows:

Operating post personnel and reviewer fail to grasp in time and adjust the change of the ore grinding after mixing steel slag; Slag granularity is comparatively large, affects larger on Vertical Mill ore grinding and Vertical Mill unit-hour output; Steel-making slag powder moisture is large, and easy putty, affects the stable of steel slag and mix; Normally mix the iron and steel quantity of slag comparatively large, need special place to be used for storing up steel slag.

gameeing of technical solution of the present invention:

According to the technological process of production, hold a meeting and analyze various major influence factors in production process, and formulated strategy table:

In the inventive solutions, buying steel slag powder fineness index is reduced: steel slag buying 5mm fineness drops to 5% by original 15%.Technological transformation is carried out to steel slag blanking bin: 1, widen feed opening, and set up material baffle, prevent material from trickling down; 2, shake in blanking bin increase.

Former 4# line associating storehouse 3 ~ 13 collapses all for storing up granulated blast-furnace slag, for convenience of steel slag material loading, collapses 3 ~ 5 wherein for storing up steel slag, and in order to avoid two kinds of material batch mixings, has built barricade specially.

the effect inspection of technical solution of the present invention:

1, on-the-spot trial production S75 level iron and steel ground-slag

Carry out on-the-spot slag 32.5 cement on July 6th, 2013, by specific surface area 450 ± 10m2/kg, steel slag volume 40% is produced as a trial continuously, and in whole production process, production unit works well, inspection by sampling result hourly is stablized, and the inspection of iron and steel ground-slag indices all complies with the national standard requirements.Main test result is as Fig. 1.

From continuous seepage check data, the iron and steel ground-slag activity of producing all meets the requirement of S75 grade standard.Steel slag incorporation is stablized, and Activity determination all meets S75 iron and steel powder standard-required.

the economic benefit of technical solution of the present invention:

1), develop S75 iron and steel ground-slag, enhance the market competitiveness of Products;

2), the procurement price of steel slag is 35 yuan/ton; and the annual procurement price 65 yuan/ton of granulated blast-furnace slag; by the steel slag incorporation production calculation of 40%; compared with the production cost of S75 level breeze, the cost producing S75 level iron and steel ground-slag will decline (65-35) x40%=12 yuan/ton.To at present only, produce iron and steel ground-slag 5800 tons altogether, create economic benefit: 6.96 ten thousand yuan.

the reinforcing measures of technical solution of the present invention:

Carried out S75 iron and steel ground-slag repeatedly in January ,-2014 in August, 2013 to produce, the steel slag powder steady quality of production, indices all complies with the national standard requirements.

2, effect continuity measure

In order to allow the lasts of this activity go down, on the basis of summing up production experience, formulate following measure;

1) strengthen the frequency of making a random inspection into factory's steel slag, it is qualified to ensure into factory's steel slag fineness;

2) service condition monitoring stored up by strength imparting material, ensures that steel slag volume is stablized;

3) iron and steel ground-slag and slag powders divide stock to put, and avoid batch mixing, cause and use inconvenience;

4) strengthen Vertical Mill training on operation, improve employee's operational capability, adjust production decision in time.

Technical scheme of the present invention, development and production S75 iron and steel ground-slag, and then effectively reduce production cost, for company brings good economic benefit.But along with mixing of steel slag, Vertical Mill unit-hour output is a greater impact.Achievement consolidation S75 level iron and steel ground-slag administration measure, quality reaches the indices of formulation.

Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1. produce a technique for S75 level iron and steel ground-slag, it is characterized in that, comprising:

A, select steel slag procurement criteria by original 5mm tail over≤15% drop to 5% steel slag, by this steel slag, MgO and SO ₃by following parts by weight proportioning:

Steel slag: 80 parts;

MgO:9.43 part;

SO ₃: 0.83 part;

B, according to the above ratio, use wide mouth blanking bin, wide mouth blanking bin is shaken; Meanwhile, granulated blast-furnace slag and steel slag are added vertical mill, produce cement by vertical mill grinding technical matters.

2. the technique of production S75 level iron and steel ground-slag according to claim 1, is characterized in that, use wide mouth blanking bin described in step b, to the operation that wide mouth blanking bin shakes, specifically comprise:

Widen feed opening, and set up material baffle, prevent material from trickling down;

While blanking, blanking bin is shaken.