A sodium polyacrylate hydrogel grinding aid and its preparation method and application

Abstract

The present invention provides a sodium polyacrylate hydrogel grinding aid and its preparation method and application, relating to the technical field of mineral grinding. By adding the sodium polyacrylate hydrogel, the present invention significantly reduces the surface energy of mineral powder, thereby greatly reducing the energy barrier for its crushing, improving the grinding efficiency, significantly reducing the grinding resistance, enhancing the fluidity of the powder, and reducing the energy consumption during the grinding process; adding triethanolamine can significantly reduce the surface tension of mineral powder particles, lower the surface energy of mineral powder, overcome the attraction between mineral powders, reduce the resistance, improve the fluidity of mineral powder, thereby improving the grindability. At the same time, it can also greatly increase the specific surface area of mineral powder, improving the grindability and activity of mineral powder; adding sodium hexametaphosphate and polyacrylamide can prevent the aggregation of mineral powder from affecting the grinding, improve the grinding efficiency of mineral powder, increase the output, and reduce the power consumption. After using the sodium polyacrylate hydrogel grinding aid provided by the present invention, the activity, grinding efficiency and output of mineral powder are increased, and the power consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral grinding, and specifically relates to a sodium polyacrylate hydrogel grinding aid and its preparation method and application. Background Art

[0002] Common hard inorganic minerals will use appropriate grinding aids during the grinding operation. The addition of grinding aids can improve the quality of the inorganic mineral powder products after grinding, reduce costs, and reduce power consumption, greatly increasing the economic benefits of enterprises. This is also of great significance for improving the technical level of mineral powder production enterprises, enhancing the market competitiveness of enterprises, and promoting the development of enterprises.

[0003] A grinding aid is the general term for chemical agents added to the mill system during the grinding process of materials. Its main functions are to improve the grinding efficiency, reduce the surface energy of the powder, accelerate the crushing speed of ore particles, and change the rheological characteristics of the mineral powder slurry due to the dispersion effect of the agent. It can also play a corrosion inhibition role on the grinding media (such as steel balls) and liners used during the grinding process, ultimately achieving the effects of reducing energy consumption, reducing steel ball consumption, and improving the crushing efficiency. Currently, the commonly used grinding aids for hard materials mainly include triethanolamine, sodium chloride, alcohol, sodium oleate, sodium silicate, ethylene glycol, and sodium polyacrylate. However, it is difficult to reduce the surface energy of mineral powder and improve the activation degree of mineral powder using the above-mentioned grinding aids, and the grinding and surface modification effects are poor. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a sodium polyacrylate hydrogel grinding aid and its preparation method and application. The sodium polyacrylate hydrogel grinding aid provided by the present invention has good grindability, excellent surface coating modification effect on mineral powder, and increases the activity of minerals.

[0005] The present invention provides a sodium polyacrylate hydrogel grinding aid, which comprises the following components in mass percentage: 68 - 84% of sodium polyacrylate hydrogel, 5 - 10% of sodium hexametaphosphate, 5 - 10% of polyacrylamide, 5 - 10% of triethanolamine, and 1 - 2% of glycerol.

[0006] Preferably, the sodium polyacrylate hydrogel grinding aid comprises the following components in mass percentage: 70 - 82% of sodium polyacrylate hydrogel, 6 - 9% of sodium hexametaphosphate, 6 - 9% of polyacrylamide, 5 - 9% of triethanolamine, and 1 - 2% of glycerol.

[0007] Preferably, the sodium polyacrylate hydrogel comprises the following components in mass percentage: 15 - 30% of sodium polyacrylate, 3 - 6% of corn starch, and 64 - 82% of water.

[0008] The present invention provides a preparation method of the sodium polyacrylate hydrogel grinding aid as described in the above technical solution, which comprises the following steps:

[0009] Mix sodium polyacrylate hydrogel and glycerol for the first time to obtain a mixture;

[0010] Mix the said mixture with triethanolamine, polyacrylamide and sodium hexametaphosphate for the second time to obtain a grinding aid for sodium polyacrylate hydrogel.

[0011] Preferably, the temperature of the first mixing is 60 - 80 °C.

[0012] Preferably, the temperature of the second mixing is room temperature.

[0013] The present invention also provides the application of the grinding aid for sodium polyacrylate hydrogel described in the above technical solution or the grinding aid for sodium polyacrylate hydrogel described in the above technical solution in the grinding of hard minerals.

[0014] Preferably, the hard minerals include one or more of calcium carbonate, wollastonite, brucite and barite.

[0015] Preferably, the incorporation amount of the grinding aid for sodium polyacrylate hydrogel is 0.02 - 0.2 wt%.

[0016] Preferably, the incorporation amount of the grinding aid for sodium polyacrylate hydrogel is 0.05 - 0.15 wt%.

[0017] The present invention provides a sodium polyacrylate hydrogel grinding aid, which comprises the following components in mass percentage: 68-84% of sodium polyacrylate hydrogel, 5-10% of sodium hexametaphosphate, 5-10% of polyacrylamide, 5-10% of triethanolamine, and 1-2% of glycerol. In the sodium polyacrylate hydrogel grinding aid provided by the present invention, the sodium polyacrylate hydrogel can adsorb on the surface of mineral powder, significantly reduce the surface energy of the mineral powder, thereby greatly reducing the energy barrier for powder breakage, improving the grinding efficiency. At the same time, it can also significantly reduce the grinding resistance, improve the fluidity of the powder, have a good surface coating and modification effect on the mineral powder, and consume less energy during the grinding process; triethanolamine and glycerol are used as auxiliary surfactants, which play a role in further reducing the surface tension of mineral powder particles, thereby reducing the surface energy of the mineral powder, overcoming the attraction between mineral powders, reducing the viscosity, reducing the resistance, improving the fluidity of the mineral powder, thereby improving the grindability. At the same time, it can also greatly increase the specific surface area of the mineral powder and improve the activity of the mineral powder. Sodium hexametaphosphate and polyacrylamide are used as dispersants, which can prevent the aggregation of mineral powder from affecting its grinding. Among them, sodium hexametaphosphate has a good dispersion effect on components such as alumina, titanium oxide, and magnesium oxide in the mineral powder, and polyacrylamide has a good dispersion effect on components such as calcium oxide in the mineral powder. The dispersant has strong pertinence, can improve the grinding efficiency of the mineral powder, increase the output of the mineral powder after grinding, reduce the power consumption, and can also promote the synergistic effect of each raw material component, reduce the surface energy increased after the silicon dioxide particles are broken, and improve the adaptability of the mineral powder grinding aid to the mineral powder. Adding the sodium polyacrylate hydrogel grinding aid provided by the present invention to the mineral powder for grinding can avoid the huge energy consumption in the processes of water removal and drying in wet grinding at the same time, save energy, improve production efficiency, and thus well solve the problems of difficult grinding and low activity of mineral powder in the current market. As shown by the test results of the examples, when sodium polyacrylate is used as the grinding aid, the D 97 of the wollastonite sample after grinding is 25.52 μm, and the activation degree is 8%; while using the sodium polyacrylate hydrogel grinding aid provided by the present invention, the D 97 of the wollastonite sample after grinding is below 16.21 μm, and the activation degree is above 66%. This shows that the sodium polyacrylate hydrogel grinding aid provided by the present invention has excellent grindability, high activity, and obvious modification effect. Specific Embodiments

[0018] The present invention provides a sodium polyacrylate hydrogel grinding aid, which comprises the following components in mass percentage: 68-84% of sodium polyacrylate hydrogel, 5-10% of sodium hexametaphosphate, 5-10% of polyacrylamide, 5-10% of triethanolamine, and 1-2% of glycerol.

[0019] Based on mass percentage, the sodium polyacrylate hydrogel grinding aid provided by the present invention comprises 68 - 84% of sodium polyacrylate hydrogel, preferably 70 - 82%, more preferably 75 - 80%. In the present invention, the sodium polyacrylate hydrogel preferably comprises the following components by mass percentage: 15 - 30% of sodium polyacrylate, more preferably 18 - 28%, further preferably 20 - 25%; 3 - 6% of corn starch, more preferably 4 - 5%; 64 - 82% of water, preferably 68 - 79%, more preferably 70 - 76%.

[0020] Based on mass percentage, the sodium polyacrylate hydrogel grinding aid provided by the present invention comprises 5 - 10% of sodium hexametaphosphate, preferably 6 - 9%, more preferably 7 - 8%.

[0021] Based on mass percentage, the sodium polyacrylate hydrogel grinding aid provided by the present invention comprises 5 - 10% of polyacrylamide, preferably 6 - 9%, more preferably 7 - 9%.

[0022] Based on mass percentage, the sodium polyacrylate hydrogel grinding aid provided by the present invention comprises 5 - 10% of triethanolamine, preferably 5 - 9%, more preferably 5 - 8%.

[0023] Based on mass percentage, the sodium polyacrylate hydrogel grinding aid provided by the present invention comprises 1 - 2% of glycerol, preferably 1 - 1.8%, further preferably 1 - 1.5%.

[0024] The present invention provides a preparation method of the sodium polyacrylate hydrogel grinding aid described in the above technical solution, comprising the following steps:

[0025] First mix the sodium polyacrylate hydrogel and glycerol to obtain a mixture;

[0026] Then mix the obtained mixture with triethanolamine, polyacrylamide and sodium hexametaphosphate to obtain the sodium polyacrylate hydrogel grinding aid.

[0027] In the present invention, unless otherwise specified, all raw material components are commercially available products well-known to those skilled in the art.

[0028] In the present invention, the sodium polyacrylate hydrogel and glycerol are first mixed to obtain a mixture. In the present invention, the temperature of the first mixing is preferably 60 - 80°C, more preferably 65 - 75°C, further preferably 70°C, and the first mixing is preferably carried out under water bath conditions; the mode of the first mixing is preferably stirring and mixing; the present invention has no special limitation on the time of the first mixing, and it is only necessary to mix the raw materials evenly.

[0029] After obtaining the mixture, the present invention mixes the mixture with triethanolamine, polyacrylamide and sodium hexametaphosphate for the second time to obtain a sodium polyacrylate hydrogel grinding aid. In the present invention, the temperature of the second mixing is preferably room temperature; the second mixing method is preferably stirring and mixing; the present invention does not have special limitations on the time of the second mixing, and it is only necessary to mix the raw materials evenly; in a specific embodiment of the present invention, the second mixing is preferably to sequentially add triethanolamine, polyacrylamide and sodium hexametaphosphate to the mixture and stir and mix evenly.

[0030] The present invention also provides the application of the sodium polyacrylate hydrogel grinding aid described in the above technical solution or the sodium polyacrylate hydrogel grinding aid described in the above technical solution in the grinding of hard minerals. In the present invention, the hard minerals preferably include one or more of calcium carbonate, wollastonite, brucite and barite, and more preferably include calcium carbonate, wollastonite, brucite or barite. In the present invention, the incorporation amount of the sodium polyacrylate hydrogel grinding aid is preferably 0.02-0.2 wt%, more preferably 0.05-0.15 wt%, and further preferably 0.1-0.15 wt%. The sodium polyacrylate hydrogel grinding aid provided by the present invention has good grindability and high activity, and has good application prospects as a grinding aid in the grinding of hard minerals.

[0031] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0032] Example 1

[0033] The mass percentage composition of the sodium polyacrylate hydrogel grinding aid: 80% sodium polyacrylate hydrogel, 8% sodium hexametaphosphate, 6% polyacrylamide, 5% triethanolamine, 1% glycerol; among them, the components of the sodium polyacrylate hydrogel are: 22% sodium polyacrylate, 4% corn starch, 74% water;

[0034] The sodium polyacrylate hydrogel and glycerol are stirred evenly in a water bath at 60 °C and then cooled to room temperature, and then triethanolamine, polyacrylamide and sodium hexametaphosphate are added in sequence and stirred and mixed evenly to obtain a sodium polyacrylate hydrogel grinding aid.

[0035] Example 2

[0036] The mass percentage composition of the sodium polyacrylate hydrogel grinding aid: 68% of sodium polyacrylate hydrogel, 10% of sodium hexametaphosphate, 10% of polyacrylamide, 10% of triethanolamine, 2% of glycerol; among them, the components of the sodium polyacrylate hydrogel are: 22% of sodium polyacrylate, 4% of corn starch, 74% of water;

[0037] Stir the sodium polyacrylate hydrogel and glycerol evenly in a water bath at 60 °C and then cool to room temperature, and then add triethanolamine, polyacrylamide and sodium hexametaphosphate in sequence, and stir and mix evenly to obtain the sodium polyacrylate hydrogel grinding aid.

[0038] Example 3

[0039] The mass percentage composition of the sodium polyacrylate hydrogel grinding aid: 75.5% of sodium polyacrylate hydrogel, 8% of sodium hexametaphosphate, 9% of polyacrylamide, 6% of triethanolamine, 1.5% of glycerol;. Among them, the components of the sodium polyacrylate hydrogel are: 22% of sodium polyacrylate, 4% of corn starch, 74% of water; Stir the sodium polyacrylate hydrogel and glycerol evenly in a water bath at 60 °C and then cool to room temperature, and then add triethanolamine, polyacrylamide and sodium hexametaphosphate in sequence, and stir and mix evenly to obtain the sodium polyacrylate hydrogel grinding aid.

[0040] Test Example 1

[0041] Testing of grinding aid effect

[0042] Use a small experimental ball mill to test the grinding aid effect of the grinding aid. The D of the wollastonite sample 97 ≥100μm, the specification of the ball mill cylinder is 0.8m(d)*1.2.m(L), the filling rate is 50%, the material-ball mass ratio is 6:1, and the ball mill speed is 40r / min. The particle size of the ground powder is tested by a laser particle size analyzer, and the D of the result is taken 97 (The particle size value corresponding to when the cumulative particle size distribution percentage reaches 97%) as the comparison result, and the ball milling time is 2h.

[0043] Experimental group: Add 0.15 wt% of the sodium polyacrylate hydrogel grinding aid prepared in Examples 1 to 3 respectively, control group: the grinding aid is 0.15 wt% of sodium polyacrylate; blank group: no grinding aid is added.

[0044] Measure the oil absorption of the product to characterize the modification effect of the grinding aid: Weigh 5 g of the sample before and after grinding (accurate to 0.01 g), place it on a glass plate, and while using a spatula to mix the sample evenly, slowly add refined linseed oil until it reaches a saturated state.

[0045] The D of the ground wollastonite sample 97 And the oil absorption test results are shown in Table 1:

[0046] Table 1 D of wollastonite samples after grinding 97 and oil absorption test results

[0047] Test items Example 1 Example 2 Example 3 Control group Blank group <![CDATA[Sample D 97 (μm)]]> 15.62 16.21 15.95 25.52 33.62 Oil absorption of sample (mL / 100g) 73 68 66 8 0

[0048] As can be seen from Table 1, the sodium polyacrylate hydrogel grinding aid prepared by the present invention can significantly reduce the particle size of wollastonite samples under the condition that the incorporation amount is only 0.15 wt%, and has excellent grinding effect; the sodium polyacrylate hydrogel grinding aid provided by the present invention can also significantly improve the activation degree of wollastonite samples, has obvious modification effect, and has broad application prospects in the development of the grinding industry of inorganic hard minerals such as wollastonite.

[0049] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A sodium polyacrylate hydrogel grinding aid, characterized in that, Comprising components with the following mass percentages: 68 - 84% of sodium polyacrylate hydrogel, 5 - 10% of sodium hexametaphosphate, 5 - 10% of polyacrylamide, 5 - 10% of triethanolamine, and 1 - 2% of glycerol; The sodium polyacrylate hydrogel comprises components with the following mass percentages: 15 - 30% of sodium polyacrylate, 3 - 6% of corn starch, and 64 - 82% of water.

2. The sodium polyacrylate hydrogel grinding aid according to claim 1, wherein The sodium polyacrylate hydrogel grinding aid comprises components with the following mass percentages: 70 - 82% of sodium polyacrylate hydrogel, 6 - 9% of sodium hexametaphosphate, 6 - 9% of polyacrylamide, 5 - 9% of triethanolamine, and 1 - 1.8% of glycerol.

3. The preparation method of the sodium polyacrylate hydrogel grinding aid according to any one of claims 1 to 2, characterized in that, Comprising the following steps: First, mix the sodium polyacrylate hydrogel and glycerol to obtain a mixture; Second, mix the mixture with triethanolamine, polyacrylamide, and sodium hexametaphosphate to obtain the sodium polyacrylate hydrogel grinding aid.

4. The preparation method according to claim 3, wherein, The temperature of the first mixing is 60 - 80°C.

5. The preparation method according to claim 3, wherein The temperature of the second mixing is room temperature.

6. Application of the sodium polyacrylate hydrogel grinding aid according to any one of claims 1 - 2 or the sodium polyacrylate hydrogel grinding aid according to any one of claims 3 - 5 in the grinding of hard minerals.

7. The application according to claim 6, wherein The hard minerals include one or more of calcium carbonate, wollastonite, brucite, and barite.

8. The application according to claim 6 or 7, characterized in that, The incorporation amount of the sodium polyacrylate hydrogel grinding aid is 0.02 - 0.2 wt%.

9. The application according to claim 6 or 7, characterized in that, The incorporation amount of the sodium polyacrylate hydrogel grinding aid is 0.05 - 0.15 wt%.