CN103172317B - Partition plate - Google Patents

Abstract

The invention discloses a partition board, which is characterized in that the weight ratio of raw materials is as follows: 37-39 parts of iron tailings, 17-19 parts of cement, 14-16 parts of carbon fiber, 6-8 parts of vermiculite powder, 0.8-1 part of paraformaldehyde crosslinking agent, 20-22 parts of water. The production steps include: (1) batching; (2) rolling carbon fiber; (3) loosening carbon fiber; (4) making slurry; (5) copying and making board; Cutting; (8) High temperature steam curing; (9) Drying; (10) Sanding the surface of the board. The partition wall board made by the invention has the characteristics of high strength, good durability, non-toxic and non-corrosive.

Description

partition board

technical field

The invention relates to a partition wall board, in particular to a preparation method of a partition wall board.

Background technique

Iron ore enterprises mainly sell raw ore and primary processed mineral products, lack of deep processing and fine processing, so that the economic and social benefits of mining development have not been fully utilized, and the phenomenon of resource waste is serious. At the same time, the industrial chain is short, and the local value-added rate of iron ore products is poor. The main components of a large amount of tailings produced by iron ore are silicon oxide and calcium carbonate. The iron tailings are used for deep processing to produce partition boards, so that the tailings can truly achieve zero emissions, thus entering a virtuous circle, which fully reflects the comprehensive utilization of waste meaning. The raw materials of traditional partition boards are quartz, asbestos and lime, which are expensive, and asbestos has certain toxicity, so it is not suitable for use in the living room.

Contents of the invention

The technical problem to be solved by the present invention is to provide a partition wall board with good mechanical properties and a preparation method thereof.

For this reason, the weight ratio of the raw materials of the partition board provided by the present invention is: 37-39 parts of iron tailings, 17-19 parts of cement, 14-16 parts of carbon fiber, 6-8 parts of vermiculite powder, tripolymer 0.8-1 part of formaldehyde cross-linking agent, 20-22 parts of water.

The carbonyl group in the paraformaldehyde crosslinking agent can react with the hydroxyl groups on the fiber molecules or fillers to form hemiacetals, and then further react to form acetals. The final result is to connect the fiber molecules or fibers and filler molecules through methylene ether bonds connected together.

Table 1 shows the relationship between the amount of paraformaldehyde crosslinking agent and the strength of the product. The table shows that when the content of paraformaldehyde is less than 0.8 parts, the compressive strength of the product increases rapidly with the increase of the content of paraformaldehyde, but when the content of paraformaldehyde is greater than 1 part, the compressive strength does not change much, while the flexural strength There is a certain decrease in strength. According to the test results, the dosage of paraformaldehyde is selected from 0.8 to 1 part.

Table 1 The relationship between the content of paraformaldehyde and the strength of the product

Paraformaldehyde dosage crosslinking agent (parts) Flexural strength (MPa) Impact strength (KJ/m ² ) 0.4 7.8 1.198 0.6 8.88 1.32 0.8 11.68 1.72 1 11.98 1.81 1.2 11.88 1.73

The present invention also provides a method for manufacturing the above-mentioned partition board, comprising the following manufacturing steps:

(1) Ingredients

Use a magnetic separator to magnetically separate iron tailings with low magnetic field strength, and then use a fine grinder to grind the magnetically separated iron tailings to the required fineness. The fineness is controlled at 0.045mm square hole sieve, and the screen balance is 8%~ 10%. From the analysis of the strength of the plate, the finer the iron tailings, the greater the activity, the faster the interaction between calcium oxide and silicon oxide, the more complete the reaction, the more the number of tobermolite crystals generated, and the higher the quality of the crystals. On the contrary, the coarser the fineness of iron tailings, the slower the reaction speed between the two, the more incomplete the reaction, the less the number of crystals generated, and the worse the crystal quality. Practice has shown that iron tailings with a fineness of 0.045mm square hole sieve is greater than 10%, it will not be easy to ensure the quality of the plate and should not be used; However, due to the filtering effect of the mesh cylinder in the production process of the copying method, fine iron tailings particles will be lost from the mesh, which will increase material consumption and increase production costs. This is the reason why the fineness of iron tailings is required to be 8% to 10% on a 0.045mm square hole sieve.

(2) Rolled carbon fiber

The adsorption of the iron tailings particles by the reinforced fiber interface during the slab forming process enables the two to be firmly bonded together, which is not only a necessary condition for the slab to be formed normally, but also enables the carbon fiber to play a good role. Reinforcement effect.

Rolling carbon fiber and hydraulic release are effective ways to improve the performance of carbon fiber interface and increase its reinforcing effect on the plate. There are many cracks on the surface of carbon fiber, and the cracks of bundled carbon fiber are more obvious. Rolling carbon fiber through a wheel mill can effectively increase the cracks and weaken the connection between bundled fibers, thereby increasing its surface area. This can not only improve the performance of the carbon fiber interface, increase its reinforcing effect, but also create a new foundation for the next step of hydraulic release. Advantageous conditions, carbon fiber rolling is the first important process to ensure the quality of the board.

If the rolling time is too long, the fibers will be easily broken, and the fiber quality will further deteriorate. If the rolling time is too short, the rolling quality cannot be guaranteed, and the rolling time is determined to be 8 to 10 minutes through experiments.

(3) Release carbon fiber

Put all the carbon fibers into the blender, then add water for loosening, the fiber loosening degree is 95%.

The time taken when the degree of carbon fiber loosening reaches about 95% is regarded as the optimum loosening time, and the loosening time is determined to be 10 to 12 minutes through experiments.

(4) Making slurry

Mix and stir the iron tailings, cement, vermiculite powder and the remaining water, the stirring time is 5 minutes, and the stirring speed is 20-30r/min; then add carbon fiber and paraformaldehyde cross-linking agent and mix and stir, the stirring time is 4-5 minutes, The stirring speed is 30-40r/min to form a slurry.

(5) copy board

The slurry is sent to the wire section of the copying machine for copying and forming.

The screen cylinder is the main part of this process, and its filtering performance is good, which not only directly affects the output of the main machine, but also has a great influence on the quality of the product due to the uniform thickness of the slab. If the filter performance of the mesh cylinder is not good, there will be clogging, even if it is partially clogged, it will form a "bald surface", resulting in thinning of the slab thickness. Especially when the net tube is blocked along the circumferential direction and in the middle of the skeleton, it becomes thinner, and the slab is prone to longitudinal fracture after hardening, resulting in a large number of waste products. Therefore, it is very important to maintain the good filtration performance of the mesh cylinder and prevent clogging, especially to prevent circumferential clogging, to ensure the quality of the material-free board.

The net cylinder of the present invention adopts fan-type water spray holes, and the washing water is sprayed in the form of a fan, which not only increases the water pressure, reduces the water consumption, but also reduces the dead angle of washing, increases the washing area of the net cylinder, and is beneficial to reducing clogging and improving the filtration performance of the net cylinder The effect is obvious.

The invention uses compressed air as the power, and is equipped with a cylinder and a swinging device, and is installed at one end of the net cylinder as a swing washing pipe, which swings and cleans back and forth along the axial direction of the net cylinder, so that the surface of the constantly rotating net cylinder can be effectively cleaned.

(6) Pressurized dehydration into billets

The pressurization pressure of the plane hydraulic press is 8-10MPa to increase the density of the slab and improve the isotropic strength of the plate.

(7) Cut blank

The produced slabs are stacked after cutting off the longitudinal and transverse burrs, and the cutting pressure is 30MPa.

(8) High temperature steam curing

Send the steam-cured trolley with the stacks into the autoclave for autoclave curing. The temperature is 125°C, and the temperature rise rate is not greater than 15°C/h, so as to avoid delamination of the slab. The pressure is 0.9MPa～1MPa, and it is kept at this pressure and temperature for 10h.

The slab enters the curing kiln. As the temperature in the kiln increases, the calcium oxide continuously precipitated in the slab interacts with the silicon oxide in the iron tailings to form hard and stable tobermolite crystals, which makes the slab have a high strength.

(9) drying

The board is dried by a dryer, and the moisture content is lower than 10%.

(10) Surface sanding

After the board surface is sanded on one side by a sander, the finished product is obtained.

The invention has the characteristics of high strength, good durability, non-toxic and non-corrosive. The invention saves resources, reduces costs, and has great environmental and social significance.

Description of drawings

Fig. 1 is an elevation view of a fan-type water spray hole, and Fig. 2 is an A-A sectional view of a fan-type water spray hole.

Detailed ways

The weight ratio of raw materials in this embodiment is: 38 parts of iron tailings, 18 parts of cement, 15 parts of carbon fiber, 7 parts of vermiculite powder, 0.9 parts of paraformaldehyde crosslinking agent, and 21.1 parts of water.

The production steps include:

(1) Ingredients

Use a magnetic separator to magnetically separate iron tailings with low magnetic field strength, and then use a fine grinder to grind the magnetically separated iron tailings to the required fineness. The fineness is controlled at 0.045mm square hole sieve, and the screen balance is 8%~ 10%.

(2) Rolled carbon fiber

The rolling time is 8-10 minutes.

(3) Release carbon fiber

Put all the carbon fibers into the blender, and then add water for loosening. The fiber loosening degree is 95%, and the loosening time is 10-12 minutes.

(4) Making slurry

Mix and stir the iron tailings, cement, vermiculite powder and the remaining water, the stirring time is 5 minutes, and the stirring speed is 20-30r/min; then add carbon fiber and paraformaldehyde cross-linking agent and mix and stir, the stirring time is 4-5 minutes, The stirring speed is 30-40r/min to form a slurry.

(5) copy board

The slurry is sent to the wire section of the copying machine for copying and forming.

Fig. 1 is an elevation view of a fan-type water spray hole, and Fig. 2 is an A-A sectional view of a fan-type water spray hole. The net cylinder adopts fan-type water spray holes, and the washing water is sprayed out in a fan-like manner.

In this embodiment, compressed air is used as the power, and a cylinder and a swinging device are arranged, and a swinging washing pipe is installed at one end of the net cylinder, and is swung back and forth along the axial direction of the net cylinder for cleaning.

(6) Pressurized dehydration into billets

The pressurization pressure of the plane hydraulic press is 8-10MPa to increase the density of the slab and improve the isotropic strength of the plate.

(7) Cut blank

The produced slabs are stacked after cutting off the longitudinal and transverse burrs, and the cutting pressure is 30MPa.

(8) High temperature steam curing

Send the steam-cured trolley with the stacks into the autoclave for autoclave curing. The temperature is 125°C, and the temperature rise rate is not greater than 15°C/h, so as to avoid delamination of the slab. The pressure is 0.9MPa～1MPa, and it is kept at this pressure and temperature for 10h.

The slab enters the curing kiln. As the temperature in the kiln increases, the calcium oxide continuously precipitated in the slab interacts with the silicon oxide in the iron tailings to form hard and stable tobermolite crystals, which makes the slab have a high strength.

(9) drying

The board is dried by a dryer, and the moisture content is lower than 10%.

(10) Surface sanding

After the board surface is sanded on one side by a sander, the finished product is obtained.

Claims (6)

1. A partition board, characterized in that the weight ratio of raw materials is as follows: 37-39 parts of iron tailings, 17-19 parts of cement, 14-16 parts of carbon fiber, 6-8 parts of vermiculite powder, tripolymer 0.8-1 part of formaldehyde cross-linking agent, 20-22 parts of water; It is characterized in that the manufacturing steps include: (1) Ingredients Use a magnetic separator to magnetically separate iron tailings with low magnetic field strength, and then use a fine grinder to grind the magnetically separated iron tailings to the required fineness. The fineness is controlled at 0.045mm square hole sieve, and the screen balance is 8%~ 10%; (2) Rolled carbon fiber (3) Release carbon fiber Put all the carbon fibers into the blender, then add water to loosen, the fiber loosening degree is 95%; (4) Making slurry Mix and stir the iron tailings, cement, vermiculite powder and the remaining water, the stirring time is 5 minutes, and the stirring speed is 20-30r/min; then add carbon fiber and paraformaldehyde cross-linking agent and mix and stir, the stirring time is 4-5 minutes, The stirring speed is 30-40r/min to form a slurry; (5) copy board The slurry is sent to the wire section of the copying machine for copying and forming; (6) Pressurized dehydration into billets The pressurization pressure of the plane hydraulic press is 8-10MPa to increase the density of the slab and improve the isotropic strength of the plate; (7) Cut blank The produced slabs are stacked after cutting off the longitudinal and transverse burrs, and the cutting pressure is 30MPa; (8) High temperature steam curing Send the steam-cured trolley with the stacks into the autoclave for autoclave curing; the temperature is 125°C, and the temperature rise rate is not greater than 15°C/h; the pressure is 0.9MPa-1MPa, and it is kept at this pressure and temperature for 10h ; (9) drying The board is dried by a dryer, and the moisture content is lower than 10%; (10) Surface sanding After the board surface is sanded on one side by a sander, the finished product is obtained. 2. The partition wall panel according to claim 1, characterized in that the optimal raw material weight ratio is as follows: 38 parts of iron tailings, 18 parts of cement, 15 parts of carbon fiber, 7 parts of vermiculite powder, 0.9 parts of paraformaldehyde crosslinking agent parts, 21.1 parts of water. 3. The partition wall panel according to claim 1, characterized in that the rolling time is 8-10 minutes. 4. The partition wall panel according to claim 1, characterized in that the carbon fiber loosening time is 10-12 minutes. 5. The partition wall panel according to claim 1, characterized in that the net cylinder adopts fan-type water spray holes, and the washing water is sprayed out in a fan-shaped manner. 6. The partition wall panel according to claim 1, characterized in that compressed air is used as the power, and a cylinder and a swinging device are arranged, and a swinging washing pipe is installed at one end of the net cylinder, and is swung back and forth along the axis of the net cylinder for cleaning.