A kind of preparation method of black pyrophyllite

Abstract

The present invention relates to a method for preparing black pyrophyllite, step one: selecting raw stones, picking out black pyrophyllite raw materials and gray pyrophyllite raw materials that meet specifications; step two: after the black pyrophyllite raw materials and gray pyrophyllite raw materials in step one are crushed by a crusher, magnetic separation is performed, and then a linear screen is used for particle size classification, and the black pyrophyllite raw materials and the gray pyrophyllite raw materials are divided into a first particle size, a second particle size and a third particle size; step three: mixing the classified black pyrophyllite particles to obtain a black pyrophyllite premix, and mixing the classified gray pyrophyllite particles to obtain a gray pyrophyllite premix. The present invention uses black pyrophyllite and gray pyrophyllite in a certain ratio, reduces the effect of the maximum synthetic pressure, prolongs the service life of the equipment, and has the effect of saving production costs.

Description

Technical Field

[0001] The invention relates to the technical field of sealing and pressure-transmitting materials, in particular to a method for preparing black pyrophyllite. Background Art

[0002] Pyrophyllite is a must for the synthesis of superhard materials under high temperature and high pressure. Its raw materials are natural minerals, so the price of pyrophyllite has also risen in recent years, and the quality of pyrophyllite has continued to decline, the safety of use has deteriorated, and the production cost has continued to increase. Black pyrophyllite is a mineral raw material that replaces the commonly used yellow pyrophyllite in China. The advantages of black pyrophyllite include: low price, and the maximum pressure used in the synthesis of superhard materials under high temperature and high pressure is relatively low. The disadvantages are: the use process of black pyrophyllite and yellow pyrophyllite is different, the sealing of black pyrophyllite is poor, and the safety factor is easy to explode, causing major safety hazards. Summary of the invention

[0003] The object of the present invention is to provide a method for preparing black pyrophyllite to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for preparing black pyrophyllite, characterized in that:

[0005] Step 1: Select the raw stones and pick out the black pyrophyllite and gray pyrophyllite raw materials that meet the specifications;

[0006] Step 2: The black pyrophyllite raw material and the gray pyrophyllite raw material in step 1 are crushed by a crusher, respectively, and then magnetically separated, and then a linear sieve is used for particle size classification, so that the black pyrophyllite raw material and the gray pyrophyllite raw material are divided into a first particle size, a second particle size and a third particle size;

[0007] Step 3: mixing the classified black pyrophyllite particles to obtain a black pyrophyllite premix, and mixing the classified gray pyrophyllite particles to obtain a gray pyrophyllite premix;

[0008] Step 4: Mix a certain proportion of black pyrophyllite premix and gray pyrophyllite premix, add water glass, and mix with a three-dimensional mixer to obtain a pyrophyllite mixture;

[0009] Step 5: Put the pyrophyllite mixture into a mold and press it using a four-column press with a pressure of 15-40 MPA to obtain a black pyrophyllite block blank;

[0010] Step 6: Place the black pyrophyllite block blank on a tray and send it into an oven, and bake it according to the roasting process to finally obtain the black pyrophyllite block.

[0011] Optionally, the specifications of the black pyrophyllite raw material and the gray pyrophyllite raw material selected in step 1 are: density greater than 1.6 g / cm3 And the purity is greater than 70%.

[0012] Optionally, the magnetic induction intensity of the magnetic separation in step 2 ranges from 0.5 to 1.2*10 4 GS, in the step 2, the first particle size range is: 6-40 mesh, the second particle size range is: 40-70 mesh, and the third particle size range is: 70 mesh or finer.

[0013] Optionally, in the step three, the first particle size of black pyrophyllite particles is 6-40 mesh, the second particle size is 40-70 mesh and the third particle size is 70 mesh in a fine mixing ratio of (5-7): (2-4): (1-2), and the first particle size of gray pyrophyllite particles is 6-40 mesh, the second particle size is 40-70 mesh and the third particle size is 70 mesh in a fine mixing ratio of (5-7): (2-4): (1-2).

[0014] Optionally, the concentration of water glass used in step 4 is 6-12%, the ratio of black pyrophyllite premix to gray pyrophyllite premix in step 4 is (2-10):(2-8), and the mixing time of the three-dimensional mixer in step 4 is greater than 0.5h.

[0015] Optionally, the baking temperature required in step six is ​​200-360° C., and the baking time is 12-30 hours.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The invention uses black pyrophyllite and gray pyrophyllite in a certain ratio, thereby reducing the effect of the maximum synthesis pressure, extending the service life of the equipment, and achieving the effect of saving production costs. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the preferred embodiments.

[0019] Embodiment 1:

[0020] 1. Selection of rough stones: Density range 1.6g / cm 3 Above, purity is more than 70%, and the color is uniform;

[0021] 2. Crushing: The black pyrophyllite raw materials and the gray pyrophyllite raw materials are crushed by crushers respectively, and then magnetic separation is performed. The required range is: 0.5-1.2*10 4 GS. Finally, a linear sieve is used for particle size classification, and the classification standards are 6-40 mesh, 40-70 mesh, and 70 mesh finer.

[0022] 3. Mixing process:

[0023] 1) Mix black pyrophyllite particles, 6-40 mesh, 40-70 mesh, 70 mesh and fine in a ratio of 5:4:1.

[0024] Obtain black pyrophyllite premix

[0025] 2) Mix the gray pyrophyllite particles, 6-40 mesh, 40-70 mesh, and 70 mesh in a fine ratio of 5:4:1.

[0026] Get gray pyrophyllite premix

[0027] 3) Mix a certain proportion of black pyrophyllite premix and gray pyrophyllite premix, and add 6-12% water glass. The ratio of black pyrophyllite premix to gray pyrophyllite premix is ​​5:5. Mix with a three-dimensional mixer for more than 0.5h to obtain a pyrophyllite mixture.

[0028] 4. Put the pyrophyllite mixture into the mold, use a four-column press with a pressure of 15-40MPA, start the machine to press, and obtain a black pyrophyllite block blank.

[0029] 5. Place the black pyrophyllite block blank on a tray and send it into an oven for baking according to the baking process at a temperature of 200-360°C for 12-30 hours to finally obtain a black pyrophyllite block.

[0030] 6. After assembling the black pyrophyllite blocks into diamond synthesis blocks, put them into a six-sided top press and set the synthesis pressure to 77-79.4Mpa. After the synthesis is completed, the abnormal deformation coefficient of the black pyrophyllite is measured to be 0.6-0.9‰.

[0031] Embodiment 2:

[0032] The steps are the same as those in Example 1, except that: black pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 7:3:2; gray pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 7:3:2; the ratio of black pyrophyllite to gray pyrophyllite is 6:4; and the pressure / Mpa used for synthetic diamond is: 75.5-78MPA pressure.

[0033] The abnormal deformation coefficient of black phyllite blocks is 0.2-0.4‰.

[0034] Embodiment three:

[0035] The steps are the same as those in Example 1, except that: black pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 5:3:2; gray pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 5:3:2; the ratio of black pyrophyllite to gray pyrophyllite is 7:3; and the pressure / Mpa used for synthetic diamond is: 73-76.2MPA pressure.

[0036] The abnormal deformation coefficient of black phyllite blocks is 0.06-0.1‰.

[0037] Embodiment 4:

[0038] The steps are the same as those in Example 1, except that: black pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 5:2:1; gray pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 5:2:1; the ratio of black pyrophyllite to gray pyrophyllite is 8:2; and the pressure / Mpa used for synthetic diamond is: 73.4-76MPA pressure.

[0039] The abnormal deformation coefficient of black phyllite blocks is 0.3-0.6‰.

[0040] Embodiment five:

[0041] The steps are the same as those in Example 1, except that: black pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 6:4:1; the gray pyrophyllite particles are mixed, and the ratio of 6-40 mesh, 40-70 mesh, and 70 mesh is 6:4:1; the ratio of black pyrophyllite and gray pyrophyllite is that only black pyrophyllite is used for pressing, and the pressure / Mpa used for synthesizing diamond is: 72-75MPA pressure.

[0042] The abnormal deformation coefficient of black phyllite blocks is 1-3‰.

[0043] The experimental data is as follows:

[0044]

[0045] By comparing the data in the examples, it can be obtained that when the black pyrophyllite particles and the gray pyrophyllite particles are in the fine ratio of 5:3:2 at 6-40 mesh, 40-70 mesh, and 70 mesh, and the particle size ratio of black pyrophyllite to gray pyrophyllite is 7:3, the abnormal deformation coefficient is the lowest and the safety is the highest.

[0046] Specifically, black pyrophyllite is used as a sealing material for high-temperature and high-pressure synthetic superhard materials. The smaller the abnormal deformation, the better the sealing and the better the safety.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing black pyrophyllite, characterized in that: Step 1: Select the raw stones and pick out the black pyrophyllite and gray pyrophyllite raw materials that meet the specifications; Step 2: The black pyrophyllite raw material and the gray pyrophyllite raw material in step 1 are crushed by a crusher, respectively, and then magnetically separated, and then a linear sieve is used for particle size classification, so that the black pyrophyllite raw material and the gray pyrophyllite raw material are divided into a first particle size, a second particle size and a third particle size; Step 3: mixing the classified black pyrophyllite particles to obtain a black pyrophyllite premix, and mixing the classified gray pyrophyllite particles to obtain a gray pyrophyllite premix; Step 4: Mix a certain proportion of black pyrophyllite premix and gray pyrophyllite premix, add water glass, and mix with a three-dimensional mixer to obtain a pyrophyllite mixture; Step 5: Put the pyrophyllite mixture into a mold and press it using a four-column press with a pressure of 15-40MPa to obtain a black pyrophyllite block blank; Step 6: Place the black pyrophyllite block blank on a tray and send it into an oven, and bake it according to the baking process to finally obtain a black pyrophyllite block; Among them, in the step three, the first particle size of black pyrophyllite particles is 6-40 mesh, the second particle size is 40-70 mesh and the third particle size is 70 mesh, and the mixing ratio of the fine particles is (5-7): (2-4): (1-2). In the step three, the first particle size of gray pyrophyllite particles is 6-40 mesh, the second particle size is 40-70 mesh and the third particle size is 70 mesh, and the mixing ratio of the fine particles is (5-7): (2-4): (1-2).

2. The method for preparing black pyrophyllite according to claim 1, wherein: The specifications of the black pyrophyllite raw material and the gray pyrophyllite raw material selected in step 1 are: density greater than 1.6g / cm 3 And the purity is greater than 70%.

3. The method for preparing black pyrophyllite according to claim 1, wherein: The magnetic induction intensity range of the magnetic separation in step 2 is 0.5-1.2*10 4 GS, in the step 2, the first particle size range is: 6-40 mesh, the second particle size range is: 40-70 mesh, and the third particle size range is: 70 mesh or finer.

4. A method for preparing black pyrophyllite according to claim 1, characterized in that: The concentration of water glass used in step 4 is 6-12%, the ratio of black pyrophyllite premix to gray pyrophyllite premix in step 4 is (2-10):(2-8), and the mixing time of the three-dimensional mixer in step 4 is greater than 0.5h.

5. A method for preparing black pyrophyllite according to claim 1, characterized in that: The baking temperature required in step six is ​​200-360° C., and the baking time is 12-30 hours.

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