CN104844033A

CN104844033A - Cement preparation method

Info

Publication number: CN104844033A
Application number: CN201510241561.5A
Authority: CN
Inventors: 张芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-13
Filing date: 2015-05-13
Publication date: 2015-08-19

Abstract

The invention provides a cement preparation method. Stone to be broken comprises limestone, clay, iron ore and coal; a pre-homogenization technique is defined as that in the raw material storage and taking processes, a stacking/reclaiming technique is utilized to realize preliminary homogenizing of raw materials; the fundamental of the pre-homogenization of the raw materials is that when the materials are stacked, a stacker is utilized to continuously stack the incoming raw materials into parallel and vertically overlapped material layers with the same thickness as many as possible according to a certain mode; during material taking, in the direction vertical to the material layers, all the material layers are cut simultaneously as much as possible, the cutting is carried out sequentially, until all the materials layers are used up. The cement preparation method provided by the invention is simple in manufacturing process and high in cement quality.

Description

A kind of cement preparation process

Technical field

The present invention relates to a kind of cement preparation process, belong to cement technology field.

Background technology

In cement production process, often produce 1 ton of silicate cement and at least want grinding 3 tons of materials, comprise various raw material, fuel, grog, compound, gypsum, according to statistics, dry cement production line grinding operation needs the power consumed to account for more than 60% of full factory power, wherein raw grinding accounts for more than 30%, and coal mill accounts for about 3%, and cement grinding accounts for 40%.Therefore, choose reasonable milling equipment and technical process, Optimizing Process Parameters, proper operation, controls operation system, is significant to guarantee quality product, reduction energy consumption.

Summary of the invention

The invention provides a kind of cement preparation process, manufacture craft is simple, and cement quality is good.

For solving above technical problem, the invention provides following technical scheme: a kind of cement preparation process, (1) is broken: the building stones of needs fragmentation are: Wingdale, clay, iron ore and coal; Adopt composite vertical crusher, broken building stones particle diameter is 3-10mm (2) raw material prehomogenization: pre-homogenizing technology is exactly deposit, withdraw in process at raw material, use heap feeding technology, realize the preliminary homogenisation of raw material, the ultimate principle of raw material prehomogenization is exactly when material is stacked, by stacker the raw material of coming in piled continuously in a certain way to be as much as possiblely parallel to each other, the bed of material of overlapping and same thickness up and down; During feeding, in the direction perpendicular to the bed of material, cut all bed of materials as far as possible simultaneously, cut successively, until take; (3) preheating: the preheating of raw material and decomposed have been come by preheater, the temperature of preheating remains on 180-250 DEG C, make to carry out gas material heat transfer process with stacking states in kiln, move on in preheater and carry out under suspended state, raw material are fully mixed with the hot gases of discharging in kiln; (4) burn till: after folding raw material complete preheating and predecomposition in cyclone preheater, next process enters in rotary kiln to carry out burning till of grog; In rotary kiln, carbonate further decomposes rapidly and a series of solid state reaction occurs, and generates the mineral in cement clinker; Along with when temperature of charge raises near, mineral can become liquid phase, are dissolved in liquid phase and carry out reaction generation grog; After sinter leaching, temperature starts to reduce; The temperature that the last high temperature chamotte drawn off by rotary kiln by cement clinker cooler is cooled to downstream conveying, depots and cement grinding mill can bear, reclaims the sensible heat of high temperature chamotte simultaneously, improves thermo-efficiency and the clinker quality of system; (5) grinding: adopt association type pulverizer to carry out powder to grog, powder step by step.

This cement preparation process that the present invention relates to, manufacture craft is simple, and cement quality is good.

Embodiment

(1) broken

In cement production process, most of raw material will carry out fragmentation, as Wingdale, clay, iron ore and coal etc.Adopt composite vertical crusher, broken building stones particle diameter is 5-8mm; Wingdale produces the maximum raw material of cement consumption, and the granularity after exploitation is comparatively large, and hardness is higher, therefore the fragmentation status that occupation ratio is more important in the material fragmentation in cement mill of Wingdale.Shattering process facilitates than grinding process economy, reasonable selection disintegrating apparatus and and milling equipment extremely important.Before material enters milling equipment, oversize material is crushed to tiny, uniform granularity as far as possible, to alleviate the load of milling equipment, the output of Ti Gao Fen machine.After material fragmentation, the separation phenomenon of material of different grain size in transport and storage process can be reduced, have in the raw material of obtained uniform composition, improve the accuracy of batching.

(2) raw material prehomogenization

Pre-homogenizing technology is exactly deposit, withdraw in process at raw material, uses the heap feeding technology of science, realizes the preliminary homogenisation of raw material, makes material storage yard possess the function of storage and homogenizing simultaneously.The ultimate principle of raw material prehomogenization is exactly when material is stacked, by stacker the raw material of coming in piled continuously in a certain way to be as much as possiblely parallel to each other, the bed of material of overlapping and same thickness up and down.During feeding, in the direction perpendicular to the bed of material, cut all bed of materials as far as possible simultaneously, cut successively, until take, i.e. " tiling is directly got ".

Feature

(1) homogenizing material composition, reduces quality fluctuation, is beneficial to the grog that the quality of production is higher, and stablizes the production of firing system.

(2) expand the utilization of mine resources, improve production efficiency, expand coverture and the interlayer in mine to greatest extent, do not go out in the process of mining or go out barren rock less.

(3) quality and the control requirement of mining can be relaxed, reduce the cost of winning in mine.

(4) to glutinous wet stock strong adaptability.

(5) for factory provides raw material steady in a long-term, also can prepare burden to the raw material of different components in stockyard, become prewired stockpile field, for stably manufactured and raising operation rate create conditions.

(6) level of automation is high.

Homogenizing: in folding System during New Style Dry-Process Production, stablizing into cellar for storing things raw ingredients is the prerequisite of stable sinter leaching thermal regulation, and raw material homogenization system plays the last effect of checking on together of stablizing into cellar for storing things raw ingredients.

Homogenization theory: adopt pneumatic blending, action of gravity, produces " funneling effect ", and when making raw meal powder unload downwards, cutting multilayer charge level, fully mixes as far as possible.Utilize different fluidization airs, make the fluidisation expansion that parallel charge level in storehouse varies in size, the discharging of some regions, some regions fluidisation, thus make charge level in storehouse produce, carry out radial direction mixing homogenizing.

Preheating folding process: the preheating of raw material and decomposed have been come by preheater, the temperature of preheating remains on 200-220 DEG C.Replace rotary kiln partial function, reach and shorten back kiln length, make to carry out gas material heat transfer process with stacking states in kiln simultaneously, move on in preheater and carry out under suspended state, raw material are fully mixed with the hot gases of discharging in kiln, and increase gas material contact area, heat transfer rate is fast, heat exchanger effectiveness is high, reaches the object improving kiln system production efficiency, reduce sinter leaching hear rate.

Principle of work: the major function of preheater makes full use of the waste gas residual heat heating raw material that rotary kiln Sum decomposition fire grate goes out, and raw material preheating and part thereof are decomposed.In order to improve the heat exchange efficiency between gas-solid to greatest extent, realizing the production increases with quality up and cost of production down of whole calcination system, must possess that gas-solid is uniformly dispersed, heat exchange rapidly and high efficiency separation three functions.(1) material dispersion heat exchange 80% is carried out in inlet duct.Raw material in feeding preheater tubes, with under the impact of high speed upstream, material is turned back upwards with air motion, is disperseed simultaneously.(2) gas solid separation is after air-flow carries material powder enters cyclone cylinder, be forced in the annulus between cyclone muff and inner core (vapor pipe) and do rotational flow, and rotate while move downward, by cylindrical shell to cone, the end of cone can be extended to always, then then rotate up rising, discharged by vapor pipe.(3) appearance of predecomposition using predecomposition technology is a technology leap of cement calcinating process.It between preheater and rotary kiln, is set up decomposing furnace and utilizes Uptake flue at kiln end, if fuel jetting device, make the endothermic process of the exothermic process of fuel combustion and the carbonate decomposition of raw material, to carry out rapidly under suspended state or fluidized in decomposing furnace, the rate of decomposition of kiln raw material is made to bring up to more than 90%.By original carbonate decomposition task of carrying out in rotary kiln, move on in decomposing furnace and carry out; Fuel major part adds in decomposing furnace, and small part is added by kiln hood, alleviates the thermal load of calcining zone in kiln, extends the wadding life-span, is conducive to producing maximizing; Because fuel mixes with raw material, fuel combustion heat passes to material in time, and burning, heat exchange and carbonate decomposition process are optimized.Thus there is a series of premium properties and the features such as high-quality, efficient, low consumption.

Burn till: after folding raw material complete preheating and predecomposition in cyclone preheater, next process enters in rotary kiln to carry out burning till of grog.In rotary kiln, carbonate further decomposes rapidly and a series of solid state reaction occurs, and generates the mineral in cement clinker.Along with when temperature of charge raises near, mineral can become liquid phase, are dissolved in liquid phase and carry out reaction generation a large amount of (grog).After sinter leaching, temperature starts to reduce.The temperature that the last high temperature chamotte drawn off by rotary kiln by cement clinker cooler is cooled to downstream conveying, depots and cement grinding mill can bear, reclaims the sensible heat of high temperature chamotte simultaneously, improves thermo-efficiency and the clinker quality of system.

Grinding: folding cement grinding is the finishing operation that cement manufactures also is the maximum operation of power consumption.Its major function is cement clinker (and jelling agent, performance adjustment material etc.) grinding to suitable granularity (representing with fineness, specific surface area etc.), form certain grain composition, increase its water accessible area, acceleration of hydration speed, meets cement slurry condensation, sclerosis requirement.

Embodiment of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.

Claims

1. a cement preparation process, is characterized in that, (1) is broken: the building stones of needs fragmentation are: Wingdale, clay, iron ore and coal; Adopt composite vertical crusher, broken building stones particle diameter is 3-10mm (2) raw material prehomogenization: pre-homogenizing technology is exactly deposit, withdraw in process at raw material, use heap feeding technology, realize the preliminary homogenisation of raw material, the ultimate principle of raw material prehomogenization is exactly when material is stacked, by stacker the raw material of coming in piled continuously in a certain way to be as much as possiblely parallel to each other, the bed of material of overlapping and same thickness up and down; During feeding, in the direction perpendicular to the bed of material, cut all bed of materials as far as possible simultaneously, cut successively, until take; (3) preheating: the preheating of raw material and decomposed have been come by preheater, the temperature of preheating remains on 180-250 DEG C, make to carry out gas material heat transfer process with stacking states in kiln, move on in preheater and carry out under suspended state, raw material are fully mixed with the hot gases of discharging in kiln; (4) burn till: after folding raw material complete preheating and predecomposition in cyclone preheater, next process enters in rotary kiln to carry out burning till of grog; In rotary kiln, carbonate further decomposes rapidly and a series of solid state reaction occurs, and generates the mineral in cement clinker; Along with when temperature of charge raises near, mineral can become liquid phase, are dissolved in liquid phase and carry out reaction generation grog; After sinter leaching, temperature starts to reduce; The temperature that the last high temperature chamotte drawn off by rotary kiln by cement clinker cooler is cooled to downstream conveying, depots and cement grinding mill can bear, reclaims the sensible heat of high temperature chamotte simultaneously, improves thermo-efficiency and the clinker quality of system; (5) grinding: adopt association type pulverizer to carry out powder to grog, powder step by step.