CN102784691A

CN102784691A - Open circuit final grinding technology

Info

Publication number: CN102784691A
Application number: CN2011101334788A
Authority: CN
Inventors: 朱顺明; 朱长洪; 王海燕
Original assignee: YANCHENG JIDA MACHINERY MANUFACTURING Co Ltd
Current assignee: YANCHENG JIDA MACHINERY MANUFACTURING Co Ltd
Priority date: 2011-05-15
Filing date: 2011-05-15
Publication date: 2012-11-21

Abstract

Open circuit final grinding technology belongs to grinding technology; materials are fed into a vertical mill; under the action of a material distribution device, the materials move to the edge of a millstone, and are grinded by a high-pressure roller at a powder grinding zone; the pulverized materials are blown at the edge of the millstone by high-speed air flow generated by a high-pressure blower fan; crude powder with a large particle size falls back to the millstone for regrinding; most powder is taken to a powder separator by the air flow for separation by particle sizes; the separated crude powder falls back to the millstone for regrinding through a material-falling pipe; the separated fine powder enters into a subsequent large-scale cloth bag deduster along with the air flow for collection so as to obtain the finished product; the air flow for powder separation is filtered and purified by the cloth bag deduster and is discharged into the atmosphere by the high-pressure blower fan. The rolling mill is organically combined with a dynamic grader; material bed-rolling grinding technology is adopted; 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, and thus the advantages of high working efficiency, good fine grinding performance, less abrasion, low energy consumption, saved investment, and simple maintenance are reached.

Description

The whole grinding process of a kind of open circuit

Technical field

The present invention relates to a kind of grinding process, the whole grinding process of particularly a kind of open circuit.

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; Provide a kind of open circuit whole grinding process; Employing rolls material bed grinding technology; To roll mill and become from the classification milling equipment, reach high efficiency, performance in small, broken bits is good, abrasion are little, energy consumption is low, reduced investment, the simple advantage of maintenance with dynamic classification machine organic assembling.

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

(1) the material feeding separating chamber that feed proportioning system is prepared drops on mill central authorities through logical powder pipeline again, and under the effect of distribution device, material moves to the mill edge, receives high pressure grinding rolls in the abrasive dust district and mills;

(2) material after pulverizing is blown afloat by the high velocity air that high pressure positive blower produces at the mill edge, and 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; Dust-contained airflow is under the effect of plane eddy current; Meal receives action of centrifugal force, after the wind blade wall collides, loses kinetic energy, slides along wall; Fall into the meal collection cone, fall on the mill grinding again through material blanking tube;

(3) " fine powder " that sub-elects gets in the follow-up large-scale sack cleaner with air-flow and is collected, and is finished product, selects the powder air-flow behind the sack cleaner filtration, purification, to enter atmosphere by high pressure positive blower again.

Beneficial effect of the present invention is: hold concurrently grinding and classifying equipoment of the whole grinding process of opening a way is one; Employing rolls a material bed grinding technology, with traditional Vertical Mill mill rotate, grinding roller is driven changes that mill is motionless, grinding roller rolls into, reduce drive diligent; 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; 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 the whole grinding process sketch map of a kind of open circuit.

The specific embodiment

Present embodiment is the whole grinding process of a kind of open circuit, and technological process is as shown in the figure, carries out according to the following steps:

Hold concurrently grinding and classifying equipoment of the whole grinding process of opening a way is one, adopts and rolls a material bed grinding technology, and Vertical Mill top connects powder concentrator, and the powder concentrator upper outlet is connected into the article gatherer through sack cleaner.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, can realize that thin layer rolls simultaneously; 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; Open a way whole grinding since repeatedly circulation roll the total operating pressure that has reduced pressure roller, and the mechanism pulverized of material bed make pressure roller pressure all act on material bed on, avoided pressure roller to contact, thereby reduced the loss of iron and steel with the direct of mill.

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

One kind the open circuit whole grinding process, it is characterized in that: carry out according to the following steps:

(1) the material feeding separating chamber that feed proportioning system is prepared drops on mill central authorities through logical powder pipeline again, and under the effect of distribution device, material moves to the mill edge, receives high pressure grinding rolls in the abrasive dust district and mills;

(2) material after pulverizing is blown afloat by the high velocity air that high pressure positive blower produces at the mill edge, and 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; Dust-contained airflow is under the effect of plane eddy current; Meal receives action of centrifugal force, after the wind blade wall collides, loses kinetic energy, slides along wall; Fall into the meal collection cone, fall on the mill grinding again through material blanking tube;

(3) " fine powder " that sub-elects gets in the follow-up large-scale sack cleaner with air-flow and is collected, and is finished product, selects the powder air-flow behind the sack cleaner filtration, purification, to enter atmosphere by high pressure positive blower again.