CN102784690A - External-circulation iron-removing grinding technology - Google Patents

Abstract

An external-circulation iron-removing grinding technology belongs to grinding technology; the external-circulation iron-removing grinding technology integrates grinding, iron removal, and grading equipment as one body; materials after rolling are blown by high-speed air flow, and then are separated at a vortex grading part; fine powder is brought by the air flow to four cyclone separators distributed uniformly at the periphery for collection; middle-crude powder slides to the outside of the mill along a pipeline, and enters a pipeline iron-removing device below through an air-locking valve; iron impurities separated by the iron-removing device are discharged through a slag discharge port; other materials enters a circulating elevator, and are fed into the mill for grinding. With the material bed-rolling grinding technology and the external-circulation iron-removing technology, powder grading is realized inside the equipment, and iron impurities in the powder are removed in time, and thus steel loss is reduced. A traditional mode in which the millstone rotates and the grinding roller is driven for the vertical mill is changed into a mode in which the millstone is fixed and the grinding roller rolls; powder grading is realized inside the equipment; and thus the working efficiency is high; the fine grinding performance is good; the abrasion is less; the energy consumption is low; the investment is saved; and the maintenance is safe and simple.

Description

A kind of outer circulation deironing grinding process

Technical field

The present invention relates to a kind of grinding process, particularly a kind of outer circulation deironing grinding process.

Background technology

Since China's reform and opening-up, national economy increases fast, and " scientific and technical innovation, autonomous innovation " become the main flow of current industrial development, and China's industry progressively develops to the direction of intensive style, energy-saving and emission-reduction, low-carbon (LC).China is manufacture of cement big country, also is cement consumption big country, reduces the mistake high energy consumption in the cement pulverizing course energetically, and is significant to China's energy-saving and emission-reduction.Add up according to interrelated data; Cement in China factory 1 ton of cement of every production needs the material of grinding more than 30 kinds; And grinding pow consumption accounts for 65%～70% of the total power consumption of manufacture of cement, and the grinding cost accounts for about 35% of total production cost, and the grinding system maintenance capacity accounts for 60% of full plant maintenance capacity.Therefore, grinding is very big to the benefit influence of cement production enterprise, and the energy-saving and emission-reduction task is arduous.Along with implementing of strategy of sustainable development policy; In order further to reduce the manufacture of cement cost, cement industry just in primary study energy savings how, reduces and pollutes; In manufacture of cement, cut down the consumption of energy good, the profitable on ecology high grade cement of exploitation environmental benefit greatly.2009 Chinese cements industry grinding technology summit forum is in Held in Nanjing, and Session Topic is " maximization of production increases with quality up and cost of production down, low cost and benefit " that realizes cement in China grinding technology and technology.Ball mill is that cement powder prepares the most frequently used material grinding equipment, and it is big, firm in structure to have a comminution ratio; Advantages such as single machine yield height and air-tightness are good; But it also has energy utilization efficiency low (generally only reaching 2-3%), and noise is big, the heavy and more high shortcoming of steel consumption of volume.Roll squeezer also is a cement grinding preparatory milling equipment commonly used, roll squeezer technology comparative maturity, and energy-saving effect is apparent in view, and equipment price is also than higher.But roll squeezer to go out machine material particles pattern bad; Influence concrete operability, must all go into abrasive dust mill so roll squeezer goes out the machine material, the material of having reached article requirement goes into to grind once more grinding not only influences mill output; Also cause grinding easily, influenced the clinker strength performance.Over more than 100 year, people have done a large amount of research to the production technology and the mechanical kinetics characteristic of grinding machine, though obtained some progress and achievement, in practice, still have the technical barrier that does not overcome as yet.

Summary of the invention

The objective of the invention is to overcome above deficiency; A kind of outer circulation deironing grinding process is provided; Employing rolls material bed grinding technology, will roll mill and dynamic classification machine organic assembling, realizes particle classifying at device interior; Realize circulation deferrization in device external, high efficiency, performance in small, broken bits is good, abrasion are little, energy consumption is low, reduced investment, maintenance safe are simple.

To achieve these goals, technology of the present invention comprises following several steps:

(1) material that feed proportioning system is prepared feeds elevator through device for transporting objects; Promote through elevator, and drop on mill central authorities, under the effect of distribution device through material blanking tube; Material moves to wear-resisting mill edge; Receive high pressure grinding rolls in the abrasive dust district and mill, be equipped with tramp iron separator on device for transporting objects and the material blanking tube, material is carried out preliminary deironing;

(2) material after the pulverizing is blown afloat by the high velocity air that high pressure positive blower produces at the mill edge; Oarse-grained meal falls back on the mill grinding again, and most of powder is brought to powder concentrator by air-flow and carries out coarse and fine separation, and dust-contained airflow is under the effect of plane eddy current; Middle meal receives action of centrifugal force; After the wind blade wall collides, loses kinetic energy, slide, fall into the meal collection cone along wall;

(3) " the middle meal " that sub-elects slips to mill through logical powder pipeline; Behind air valve, get into the pipeline tramp iron separator of below, discharged by slag-drip opening through the isolated iron tramp of tramp iron separator, rest materials gets into the circularly enhancing machine; Carry out grinding in the feeding mill again, repeat above-mentioned steps;

(4) " fine powder " that sub-elects gets in the cyclone separator that is uniformly distributed with all around with air-flow, is slipped to subsequently in the fines collection device to be collected, and is finished product, and clean gas flow gets into the high pressure positive blower circulation, gets into once more and mills.

Beneficial effect of the present invention is: hold concurrently grinding, deironing and classifying equipoment of outer circulation deironing grinding process is one; Employing rolls material bed grinding technology, realizes particle classifying at device interior, realizes circulation deferrization in device external; With traditional Vertical Mill mill rotate, grinding roller is driven changes that mill is motionless, grinding roller rolls into; Reduce driving hard, good rigidly reduces improper vibrations; On the grinding roller that rolls, pressurize and roll, make grinding pressure than traditional raising 3-4 doubly, mill efficiency is high, and performance in small, broken bits is good; On-load pressure is at the inner autodigestion of Vertical Mill, and the basis requires low, and civil engineering input cost is little; Adopt the outer circulation deferrization process, in time get rid of iron tramp, reduce the grinding roller wearing and tearing; The indoor uniform distribution device that is provided with of grinding can form uniform and stable material bed on mill.

Description of drawings

Be to combine accompanying drawing and embodiment that the present invention is further described below:

It among the figure a kind of outer circulation deironing grinding process sketch map;

The specific embodiment

Present embodiment is a kind of outer circulation deironing grinding process, and technological process is as shown in the figure, carries out according to the following steps:

(1) material that feed proportioning system is prepared feeds elevator through device for transporting objects; Promote through elevator, and drop on mill central authorities, under the effect of distribution device through material blanking tube; Material moves to the mill edge; Receive high pressure grinding rolls in the abrasive dust district and mill, be equipped with tramp iron separator on device for transporting objects and the material blanking tube, material is carried out preliminary deironing;

(2) material after the pulverizing is blown afloat by the high velocity air that high pressure positive blower produces at the mill edge; Oarse-grained meal falls back on the mill grinding again, and most of powder is brought to powder concentrator by air-flow and carries out coarse and fine separation, and dust-contained airflow is under the effect of plane eddy current; Middle meal receives action of centrifugal force; After the wind blade wall collides, loses kinetic energy, slide, fall into the meal collection cone along wall;

(3) " the middle meal " that sub-elects slips to mill through logical powder pipeline; Behind air valve, get into the pipeline tramp iron separator of below, discharged by slag-drip opening through the isolated iron tramp of tramp iron separator, rest materials gets into the circularly enhancing machine; Carry out grinding in the feeding mill again, repeat above-mentioned steps;

(4) " fine powder " that sub-elects gets in the cyclone separator that is uniformly distributed with all around with air-flow, is slipped to subsequently in the fines collection device to be collected, and is finished product, and clean gas flow gets into the high pressure positive blower circulation, gets into once more and mills.

Hold concurrently grinding, deironing and classifying equipoment of outer circulation deironing grinding process is one, and Vertical Mill top is connected with powder concentrator, establishes the fines collection device around the powder concentrator; Fan outlet is connected with the Vertical Mill bottom; Return air duct is connected with the powder concentrator top, and the middle meal collection cone of powder concentrator is terminal to be connected with logical powder pipeline, and logical tube cell road junction is connected with the elevator charging aperture; The elevator top connects material blanking tube, and the material blanking tube outlet is positioned at the Vertical Mill top middle portion.Rolling grinding tool has the advantage of vertical mill and roll squeezer to overcome its defective again simultaneously, has improved capacity usage ratio, has reduced the loss of iron and steel in the grinding process.This technology puts on the pressure on the pressure roller to the grinding pressure of material from the deadweight and the spring of pressure roller; As long as pressure roller is applied to the intensity of the stress of material greater than material; Just can or crack, promote the energy that abrasive body consumed when ball mill is worked thereby saved the material crushing; The structure that rolls mill has the selection grading to the material of different-grain diameter; And can drag plus-pressure continuously; There is Continuous Tracking to pulverize effect to individual particle; Improved crush efficiency; Simultaneously can realize that thin layer rolls; Do not have the rely material bed effect of work of roll squeezer, saved the energy loss that factors such as material bed precommpression cause; Can in grinding machine, the automatic self-loopa of repeated multiple times roll, more much higher than the operating efficiency of roll squeezer, and roll linear velocity doubly than the fast 2-3 of roll squeezer; Grinding rolls the total work pressure that has reduced pressure roller owing to repeatedly circulate; And the mechanism pulverized of material bed make pressure roller pressure all act on material bed on; Avoided pressure roller to contact with the direct of mill; Adopt the outer circulation deferrization process simultaneously; In time the iron tramp in the powder is got rid of, thereby reduced the loss of iron and steel.

The present invention can also have other embodiments, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of requirement protection of the present invention.

Claims (1)

1. outer circulation deironing grinding process is characterized in that: carry out according to the following steps:

(1) material that feed proportioning system is prepared feeds elevator through device for transporting objects; Promote through elevator, and drop on mill central authorities, under the effect of distribution device through material blanking tube; Material moves to wear-resisting mill edge; Receive high pressure grinding rolls in the abrasive dust district and mill, be equipped with tramp iron separator on device for transporting objects and the material blanking tube, material is carried out preliminary deironing;

(2) material after the pulverizing is blown afloat by the high velocity air that high pressure positive blower produces at the mill edge; Oarse-grained meal falls back on the mill grinding again, and most of powder is brought to powder concentrator by air-flow and carries out coarse and fine separation, and dust-contained airflow is under the effect of plane eddy current; Middle meal receives action of centrifugal force; After the wind blade wall collides, loses kinetic energy, slide, fall into the meal collection cone along wall;

(3) " the middle meal " that sub-elects slips to mill through logical powder pipeline; Behind air valve, get into the pipeline tramp iron separator of below, discharged by slag-drip opening through the isolated iron tramp of tramp iron separator, rest materials gets into the circularly enhancing machine; Carry out grinding in the feeding mill again, repeat above-mentioned steps;

(4) " fine powder " that sub-elects gets in the cyclone separator that is uniformly distributed with all around with air-flow, is slipped to subsequently in the fines collection device to be collected, and is finished product, and clean gas flow gets into the high pressure positive blower circulation, gets into once more and mills.