CN111775281A

CN111775281A - Drying-free short-process preparation method of grey tile based on dry process

Info

Publication number: CN111775281A
Application number: CN202010716080.6A
Authority: CN
Inventors: 姚长青; 徐顺涛; 刘纯杰
Original assignee: Shandong Yike Energy Saving Technology Co ltd
Current assignee: Shandong Yike Energy Saving Technology Co ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2020-10-16

Abstract

The invention provides a drying-free short-flow preparation method of a grey tile based on a dry process. The method comprises the following steps: firstly, coarsely crushing raw materials to be less than 40 mm; then sending the mixture into a Raymond mill for dry grinding, and winnowing out particles with the particle size of less than 100 meshes to obtain powder; feeding the powder into a granulator for humidifying granulation, and controlling the moisture content to be 6-8% to obtain granules; then conveying the granules to an automatic brick press to be pressed into semi-finished products; and finally, sintering. The invention introduces the granulation function, the granulated powder has better fluidity and has good exhaust performance when being pressed by a press, so that the defects of interlayers, cracks and the like are not easy to appear, and the yield is improved. The invention abandons the traditional dry and wet process, shortens the process flow, is simple to operate and greatly reduces the production cost; meanwhile, the method can save resources and reduce the emission of atmospheric pollutants in the production process, thereby having the technical advantages of energy conservation, consumption reduction and environmental friendliness.

Description

Drying-free short-process preparation method of grey tile based on dry process

Technical Field

The invention relates to the technical field of green tile preparation, in particular to a drying-free short-process preparation method of green tiles based on a dry process technology.

Background

The green tile is also called as ancient tile, has long production history, is mainly used in the field of ancient buildings and antique buildings, and is mainly prepared by crushing, kneading, extruding and roasting clay and shale. The shape of the utility model is arched, flat and semicircular, which gives people the feeling of primitive simplicity, elegance, stability and tranquility. The green tile has the effects of heat preservation, heat insulation, rain prevention and the like, most of the color tones of the green tile are the result of the action of iron oxide in different atmospheres of the kiln, the oxidation atmosphere forms light red-purple, and the reduction atmosphere is gray-cyan.

The production of the traditional green tile mainly comprises two methods, namely a wet process and a dry process according to different processing modes of raw materials. The wet process has the advantages of more uniform grinding and mixing of materials, higher energy consumption, high production cost, difficult realization of energy conservation and consumption reduction and high enterprise survival pressure. The dry-method powder-making drying-free process is mainly a raw material processing link, so that a vulcanization drying procedure after granulation is omitted, and the energy consumption cost in production is greatly reduced.

However, the conventional dry process still has certain defects, and the process flow is as follows:

grinding → sieving → humidifying → aging → pressing → burning → sorting → packaging.

The existing dry powder process has the defects of interlayer, crack and the like of products in the pressing process of a press because the process is too rough and granulation is not carried out, and the yield is low.

Disclosure of Invention

The invention aims to overcome the technical defects of the prior art, and provides a drying-free short-flow preparation method of a grey tile based on a dry process, so as to solve the technical problem that the product is easy to have the defects of interlayer, cracks and the like in the pressing process of a press in the conventional dry process.

Another technical problem to be solved by the present invention is how to shorten the process flow and simplify the operation amount.

The invention aims to solve the technical problem of reducing pollutant emission.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a drying-free short-flow preparation method of a green tile based on a dry process technology comprises the following steps:

1) coarsely crushing the raw materials to be less than 40 mm;

2) sending the mixture into a Raymond mill for dry grinding, and then air-selecting particles with the particle size of less than 100 meshes to obtain powder;

3) feeding the powder obtained in the step 2) into a granulator for humidifying granulation, and controlling the moisture content to be 6-8% to obtain granules;

4) conveying the granular materials obtained in the step 3) to an automatic brick press to be pressed into semi-finished products;

5) and (4) conveying the semi-finished product obtained in the step 4) to a kiln for sintering.

In the step 2), the raw materials are subjected to spray wetting granulation after Raymond, and the traditional ceramic spray drying and granulation process is not carried out, so that the energy consumption and the discharge of atmospheric pollutants are reduced. The granules obtained in the step (3) are directly used for pressing a semi-finished product by a press without a fluidized bed drying process, so that the energy consumption is reduced.

Preferably, the feedstock in step 1) comprises clay or shale.

Preferably, the powder material in the step 2) is sieved by a 100-mesh sieve, and the sieve residue is less than 6%.

Preferably, the moisture content in step 3) is 7%.

Preferably, the firing temperature in the step 5) is 1120-1160 ℃, and the firing time is 45-70 minutes.

Preferably, the method further comprises the following step 6): sorting and packaging the products fired in the step 5) to obtain finished products.

In the above technical scheme: by adopting the winnowing process, the powder meeting the requirement of the particle size in the grinding process can be immediately selected, and the over-grinding phenomenon in the grinding process is avoided as much as possible, so that the energy consumption required by grinding is greatly reduced. Meanwhile, the dry humidifying granulation method is adopted, so that the spray drying process in the wet process can be omitted, the energy consumption of spray drying is avoided, and the emission of atmospheric pollutants is reduced. In addition, a granulation function is introduced, the granulated powder has good fluidity, and the air exhaust performance is good when the powder is pressed by a press, so that the defects of interlayers, cracks and the like are not easy to occur, and the yield is improved.

The invention provides a drying-free short-flow preparation method of a grey tile based on a dry process. The method abandons the traditional dry and wet process, shortens the process flow, is simple to operate, and greatly reduces the production cost; meanwhile, the method can save resources and reduce the emission of atmospheric pollutants in the production process, thereby having the technical advantages of energy conservation, consumption reduction and environmental friendliness.

Detailed Description

Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

The overall technical scheme of the invention is as follows:

(1) ingredients

Crushing the raw materials for producing the green tile to be less than 40 mm.

(2) Grinding

Mixing the crushed green tile (composite ancient tile) raw materials, putting the mixture into a Raymond mill, carrying out dry grinding, then carrying out air separation on particles with the particle size of less than 100 meshes, and controlling the residual of 100 meshes to be less than 6% to obtain powder.

(3) Granulating

And (3) putting the powder obtained in the step (2) into a granulator for humidifying granulation, and controlling the moisture content to be about 7% to obtain granules.

(4) Shaping of

And (4) conveying the granular material obtained in the step (3) to a press process, and pressing to obtain a qualified semi-finished product through the press.

(5) Firing into

And (4) feeding the semi-finished product obtained in the step (4) into a sintering kiln along with a conveying line, and then sintering at high temperature.

(6) Sorting

And (5) cooling the product fired in the step (5), and then sorting and packaging to obtain a finished product.

Preferably, the dry grinding in step (2) is carried out by adopting an air separation process to screen out particles with the particle size of less than 100 meshes. The powder meeting the requirement of the particle size in the grinding process by adopting the winnowing process can be immediately selected, and the over-grinding phenomenon in the grinding process is avoided as much as possible, so that the energy consumption required by grinding is greatly reduced.

Preferably, the dry-method humidifying granulation in the step (3) can remove the spray drying process in the wet-method process, does not consume energy in the spray drying process, and can avoid the emission of atmospheric pollutants in the production process.

Preferably, the dry humidifying granulation in the step (3) has 6-8% of granulation moisture, is suitable for a press, has more granulation functions than the existing dry process, has better fluidity for the granulated powder, has good exhaust performance during press pressing, and can improve the yield in the production process.

Preferably, the firing temperature in the step (5) is 1120-1160 ℃, and the firing period is 45-70 minutes.

The comparison between the present invention and the prior art in terms of cost and yield is shown in table 1.

TABLE 1 comparison of cost and yield between different processes

Content providing method and apparatus	Short-flow drying-free drying process	Existing dry process	Conventional wet process
				Pulverized fuel gas m³	0	0	40
Drying Process m³	0	0	7
				Total up to	0	0	47
Conversion money (Yuan)	0	0	126.9
				Content providing method and apparatus	Dry powder making process	Dry powder making process	Conventional wet process
Additive (Yuan)	0	0	8-12
				Electric charge (Yuan)	30-35	30-35	40-45
Total (yuan)	30-35	30-35	174.9-183.9
				The rate of finished products%	99.3	80-85	99.5

Note: real-time price of natural gas is 2.7 yuan/m³And (4) calculating.

Example 1

The new production line of a certain company in Hunan adopts the process:

(1) ingredients

Crushing clay and shale to below 40 mm.

(2) Grinding

Adding a small amount of fine iron powder into the crushed clay and shale according to a proportion, mixing, conveying the mixture into a Raymond mill, carrying out dry grinding, then carrying out air separation on particles with the particle size of less than 100 meshes, and controlling the residual of a 100-mesh sieve to be less than 6% to obtain powder.

(3) Granulating

(4) Shaping of

(5) Firing into

(6) Sorting

Table 1 example 1 finished product index

Item	Detection method	Example 1	National standard class I
				Water absorption (%)	GB/T36584	5.5	≤6
Flexural Strength (mpa)	GB/T36584	11.8	Not less than 10
				Freezing resistance	GB/T36584	18 times of	Not less than 15 times
Resistance to rapid cooling and heating	GB/T36584	15 times of	Not less than 10 times
				Resistance to permeation	GB/T36584	No water drop in 10 hours	3 little no water drop
Salt resistance	GB/T36584	0.3	≤0.4

The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.

Claims

1. A drying-free short-flow preparation method of a green tile based on a dry process technology is characterized by comprising the following steps:

1) coarsely crushing the raw materials to be less than 40 mm;

2. The method for preparing the green tile drying-free short flow based on the dry process according to claim 1, wherein the raw material in the step 1) comprises clay or shale.

3. The dry process-based non-drying short-process preparation method of the cyan tile according to claim 1, wherein the powder in the step 2) is sieved by a 100-mesh sieve, and the sieve residue is less than 6%.

4. The dry process-based non-baking short-process preparation method of cyan tile according to claim 1, wherein the moisture content in step 3) is 7%.

5. The dry process-based baking-free short-flow preparation method of the grey tile according to claim 1, characterized in that the firing temperature in the step 5) is 1120-1160 ℃, and the firing time is 45-70 minutes.

6. The dry process-based green tile drying-free short-process preparation method according to claim 1, characterized by further comprising the following step 6): sorting and packaging the products fired in the step 5) to obtain finished products.