A semi-solid grinding aid and its preparation method and application

Abstract

The present invention provides a semi-solid grinding aid and its preparation method and application, relating to the technical field of mineral grinding. By adding 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 powder fluidity, and reducing the energy consumption during the grinding process; adding sodium pyrophosphate and polyacrylamide can avoid the aggregation of mineral powder affecting the grinding, improve the grinding efficiency of mineral powder, increase the output, and reduce the power consumption. Adding polyethylene glycol, sucrose, and silane coupling agent KH-560 can further reduce the surface tension of mineral powder particles, reduce the surface energy of mineral powder, overcome the attraction between mineral powders, reduce the resistance, improve the fluidity of mineral powder, and thus improve the grindability and activity of mineral powder. After using the semi-solid grinding aid provided by the present invention, the grinding efficiency of mineral powder is improved, the output is increased, the power consumption is reduced, and the oil absorption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral grinding, and particularly relates to a semi-solid grinding aid and its preparation method and application. Background Art

[0002] Silica powder is a powder with controllable particle size obtained by crushing, grinding, and classifying raw ore quartz ore. Silica powder has high strength, wear resistance, high adhesion, corrosion resistance, good anti-aging and radiation protection effects, good covering power and adhesion, and is widely used in industries such as inks, coatings, plastics, ceramics, construction, and papermaking. For example, due to the bright white color, low oil absorption, and high hardness of silica powder, doping high-purity silica powder in powder coatings can produce high-quality white and soft light-colored coatings, improve the toughness and durability of the coatings, maintain the smooth surface and good gloss of the coatings, resistance to washing and weathering, reduce the adsorption performance of the coatings, and have anti-corrosion ability. The surface-treated silica powder particles are fine, and it is a multi-functional filler with low cost and high benefit, and is widely used in industrial and anti-corrosion, floor paints, and ink coatings.

[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, accelerate the crushing speed of ore particles, and due to the dispersion effect of the agent, change the rheological characteristics of the ore powder slurry, and finally achieve the effects of reducing energy consumption, reducing the consumption of steel balls during the grinding process, and improving the crushing efficiency. Using a suitable grinding aid can improve product quality, reduce costs, and reduce power consumption, greatly increasing the economic benefits of enterprises. Currently, common grinding aids for silica include triethanolamine, alcohol, sodium oleate, sodium silicate, and sodium polyacrylate. However, it is difficult to reduce the surface energy of ore powder and improve the fluidity of ore 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 semi-solid grinding aid and its preparation method and application. The semi-solid grinding aid provided by the present invention has good grindability and excellent surface coating modification effect on minerals, thereby improving the activity of ore powder.

[0005] The present invention provides a semi-solid grinding aid, which comprises the following components in mass percentage: 60 - 78% of polymethyl acrylate sodium hydrogel, 8 - 16% of sodium pyrophosphate, 7 - 12% of polyacrylamide, 5 - 8% of sucrose, 1 - 2% of polyethylene glycol, and 1 - 2% of silane coupling agent KH-560.

[0006] Preferably, the semi-solid grinding aid comprises the following components in mass percentage: 65-78% of sodium polymethacrylate hydrogel, 8-15% of sodium pyrophosphate, 7-10% of polyacrylamide, 5-7% of sucrose, 1-1.5% of polyethylene glycol, and 1-2% of silane coupling agent KH-560.

[0007] Preferably, the sodium polymethacrylate hydrogel comprises the following components in mass percentage: 15-30% of sodium polymethacrylate, 3-6% of sodium alginate, 5-10% of konjac powder, and 54-77% of water.

[0008] The present invention provides a preparation method of the semi-solid grinding aid described in the above technical solution, comprising the following steps:

[0009] Mix sodium polymethacrylate hydrogel and polyethylene glycol for the first time to obtain a mixture;

[0010] Mix the mixture with silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide, and sodium pyrophosphate for the second time to obtain a semi-solid grinding aid.

[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 semi-solid grinding aid described in the above technical solution or the semi-solid grinding aid described in the above technical solution in the grinding of minerals.

[0014] Preferably, the mineral comprises one or more of quartz, calcium carbonate, barite, and wollastonite.

[0015] Preferably, the incorporation amount of the semi-solid grinding aid is 0.02-0.2 wt%.

[0016] Preferably, the incorporation amount of the semi-solid grinding aid is 0.05-0.15 wt%.

[0017] The present invention provides a semi-solid grinding aid, which comprises components with the following mass percentages: 60-78% of sodium polymethacrylate hydrogel, 8-16% of sodium pyrophosphate, 7-12% of polyacrylamide, 5-8% of sucrose, 1-2% of polyethylene glycol, and 1-2% of silane coupling agent KH-560. In the semi-solid grinding aid provided by the present invention, the sodium polymethacrylate hydrogel can adsorb on the surface of minerals, significantly reducing the surface energy of the minerals, thereby greatly reducing the energy barrier for powder crushing, improving the grinding efficiency, and at the same time can also significantly reduce the grinding resistance and improve the powder fluidity. It has a good surface coating and modification effect on minerals and can also reduce the energy consumption during the grinding process; sodium pyrophosphate and polyacrylamide as dispersants can prevent the aggregation of minerals from affecting the grinding, improve the grinding efficiency of minerals, increase the output, and reduce the power consumption. Polyethylene glycol, sucrose, and silane coupling agent KH-560 act as auxiliary surfactants, further reducing the surface tension of the mineral powder particles, thereby reducing the surface energy of the mineral powder, overcoming the attraction between the mineral powders, reducing the viscosity of the mineral powder, reducing the resistance, and improving the fluidity of the mineral powder, thus improving the grindability and activity of the mineral powder; under the combined action of the above components, the semi-solid grinding aid has good grindability, high activity, and excellent surface coating and modification effects. Adding the semi-solid grinding aid provided by the present invention to minerals for grinding can avoid the huge energy consumption in the processes of water removal and drying in wet grinding, save energy, improve production efficiency, reduce the oil absorption of the mineral powder, and thus well solve the problems of difficult grinding and low activity of silica 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 ground quartz sample is 26.32 μm, and the oil absorption is 22 mL / 100 g; while using the semi-solid grinding aid provided by the present invention, the D 97 of the ground quartz sample is below 18.22 μm, and the oil absorption is below 18.5 mL / 100 g, indicating that the semi-solid grinding aid provided by the present invention has excellent grindability and obvious modification effects. Specific embodiments

[0018] The present invention provides a semi-solid grinding aid, which comprises components with the following mass percentages: 60-78% of sodium polymethacrylate hydrogel, 8-16% of sodium pyrophosphate, 7-12% of polyacrylamide, 5-8% of sucrose, 1-2% of polyethylene glycol, and 1-2% of silane coupling agent KH-560.

[0019] In terms of mass percentage, the semi-solid grinding aid provided by the present invention comprises 60 - 78% of sodium polyacrylate hydrogel, preferably 65 - 78%, more preferably 70 - 78%. In the present invention, the sodium polyacrylate hydrogel preferably comprises the following components in terms of mass percentage: 15 - 30% of sodium polyacrylate, more preferably 18 - 28%, further preferably 20 - 25%; 3 - 6% of sodium alginate, more preferably 4 - 5%; 5 - 10% of konjac powder, more preferably 6 - 9%, further preferably 7 - 8%; 54 - 77% of water, preferably 59 - 72%, more preferably 62 - 69%.

[0020] In terms of mass percentage, the semi-solid grinding aid provided by the present invention comprises 8 - 16% of sodium pyrophosphate, preferably 8 - 15%, more preferably 8 - 12%.

[0021] In terms of mass percentage, the semi-solid grinding aid provided by the present invention comprises 7 - 12% of polyacrylamide, preferably 7 - 10%, more preferably 7 - 9%.

[0022] In terms of mass percentage, the semi-solid grinding aid provided by the present invention comprises 5 - 8% of sucrose, preferably 5 - 7%, further preferably 5 - 6%.

[0023] In terms of mass percentage, the semi-solid grinding aid provided by the present invention comprises 1 - 2% of polyethylene glycol, preferably 1 - 1.5%, further preferably 1 - 1.2%; the number-average molecular weight of the polyethylene glycol is preferably 400 - 6000, more preferably 1000 - 5000.

[0024] In terms of mass percentage, the semi-solid grinding aid provided by the present invention comprises 1 - 2% of silane coupling agent KH-560, preferably 1 - 1.8%, further preferably 1 - 1.5%.

[0025] The present invention provides a preparation method of the semi-solid grinding aid described in the above technical solution, comprising the following steps:

[0026] First mix sodium polyacrylate hydrogel and polyethylene glycol to obtain a mixture;

[0027] Second mix the mixture with silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide and sodium pyrophosphate to obtain the semi-solid grinding aid.

[0028] In the present invention, without special instructions, all raw material components are commercially available products well-known to those skilled in the art.

[0029] The present invention first mixes sodium polymethacrylate hydrogel and polyethylene glycol to obtain a mixture. In the present invention, the temperature of the first mixing is preferably 60-80 °C, more preferably 65-75 °C, and further preferably 70 °C. The first mixing is preferably carried out under water bath conditions; the manner of the first mixing is preferably stirring and mixing; the present invention has no special limitation on the time of the first mixing, as long as the raw materials can be mixed evenly.

[0030] After obtaining the mixture, the present invention second mixes the mixture with silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide and sodium pyrophosphate to obtain a semi-solid grinding aid. In the present invention, the temperature of the second mixing is preferably room temperature; the manner of the second mixing is preferably stirring and mixing; the present invention has no special limitation on the time of the second mixing, as long as the raw materials can be mixed evenly; in a specific embodiment of the present invention, the second mixing is preferably adding silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide and sodium pyrophosphate to the mixture in ethanol in sequence and stirring and mixing evenly.

[0031] The present invention also provides the application of the semi-solid grinding aid described in the above technical solution or the semi-solid grinding aid described in the above technical solution in the grinding of minerals. In the present invention, the mineral preferably includes one or more of quartz, calcium carbonate, barite and wollastonite, more preferably includes quartz, calcium carbonate, barite or wollastonite; the application preferably includes the primary grinding of minerals into mineral powder or the deep grinding of mineral powder. In the present invention, the incorporation amount of the semi-solid 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 semi-solid 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 minerals.

[0032] 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 efforts shall fall within the protection scope of the present invention.

[0033] Example 1

[0034] The mass percentage composition of the semi-solid grinding aid: 60% of sodium polymethacrylate hydrogel, 16% of sodium pyrophosphate, 12% of polyacrylamide, 8% of sucrose, 2% of polyethylene glycol (M = 4000), 2% of silane coupling agent KH-560; among them, the components of the sodium polymethacrylate hydrogel are: 22% of sodium polymethacrylate, 5% of sodium alginate, 7% of konjac powder, 66% of water.

[0035] The sodium polymethacrylate hydrogel and polyethylene glycol were stirred evenly under the condition of a 70 °C water bath and then cooled to room temperature. Subsequently, silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide, and sodium pyrophosphate were added in sequence and stirred and mixed evenly to obtain a semi-solid grinding aid.

[0036] Example 2

[0037] The mass percentage composition of the semi-solid grinding aid: 78% sodium polymethacrylate hydrogel, 8% sodium pyrophosphate, 7% polyacrylamide, 5% sucrose, 1% polyethylene glycol (M = 4000), 1% silane coupling agent KH-560; among them, the composition of the sodium polymethacrylate hydrogel is: 22% sodium polymethacrylate, 5% sodium alginate, 7% konjac powder, 66% water:

[0038] The sodium polymethacrylate hydrogel and polyethylene glycol were stirred evenly under the condition of a 75 °C water bath and then cooled to room temperature. Subsequently, silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide, and sodium pyrophosphate were added in sequence and stirred and mixed evenly to obtain a semi-solid grinding aid.

[0039] Example 3

[0040] The mass percentage composition of the semi-solid grinding aid: 68% sodium polymethacrylate hydrogel, 15% sodium pyrophosphate, 9% polyacrylamide, 5% sucrose, 1% polyethylene glycol (M = 4000), 2% silane coupling agent KH-560; among them, the composition of the sodium polymethacrylate hydrogel is: 22% sodium polymethacrylate, 5% sodium alginate, 7% konjac powder, 66% water;

[0041] The sodium polymethacrylate hydrogel and polyethylene glycol were stirred evenly under the condition of a 65 °C water bath and then cooled to room temperature. Subsequently, silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide, and sodium pyrophosphate were added in sequence and stirred and mixed evenly to obtain a semi-solid grinding aid.

[0042] Test Example 1

[0043] Quartz powder grinding effect test

[0044] The grinding effect of the grinding aid was tested using a small experimental ball mill. The D of the quartz sample 97 ≥120 μm, the specifications of the ball mill cylinder are 0.8 m (d) * 1.2 m (L), the filling rate is 45%, the material-ball mass ratio is 7:1, and the ball mill rotation speed is 35 r / min. The particle size of the ground powder was tested using a laser particle size analyzer, and the D of the result 97 (The particle size value corresponding to when the cumulative particle size distribution percentage reaches 97%) was used as the comparison result, and the ball milling time was 2 h.

[0045] Experimental group: Add 0.15 wt% of the semi-solid grinding aids prepared in Examples 1 to 3 respectively; Control group: The grinding aid is sodium polyacrylate at 0.15 wt%; Blank group: No grinding aid is added.

[0046] Measure the oil absorption of the product to characterize the modification effect of the grinding aid: Weigh 5 g of the samples before and after grinding (accurate to 0.01 g), place them on a glass plate, while mixing the samples evenly with a spatula, slowly drip refined linseed oil until it reaches the saturated state.

[0047] The D of the ground quartz sample 97 and the test results of the oil absorption are shown in Table 1:

[0048] Table 1 The D of the ground quartz sample 97 and the test results of the oil absorption

[0049] Test items Example 1 Example 2 Example 3 Control group Blank group <![CDATA[Sample D 97 (μm)]]> 18.22 17.81 17.95 26.32 34.52 Oil absorption of sample (mL / 100g) 18.5 18 18 22 23

[0050] As can be seen from Table 1, under the condition that the doping amount of the semi-solid grinding aid prepared by the present invention is only 0.15 wt%, the particle size of the quartz sample can be significantly reduced, and it has excellent grinding aid effect; the semi-solid grinding aid provided by the present invention can also significantly reduce the oil absorption of the quartz sample, with obvious modification effect, and has broad application prospects in the development of the quartz grinding industry.

[0051] The above is only the preferred embodiment of the present invention. It should be noted 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 semi-solid grinding aid, characterized in that, Comprising components with the following mass percentages: 60 - 78% of sodium polymethacrylate hydrogel, 8 - 16% of sodium pyrophosphate, 7 - 12% of polyacrylamide, 5 - 8% of sucrose, 1 - 2% of polyethylene glycol, and 1 - 2% of silane coupling agent KH-560; The sodium polymethacrylate hydrogel comprises components with the following mass percentages: 15 - 30% of sodium polymethacrylate, 3 - 6% of sodium alginate, 5 - 10% of konjac powder, and 54 - 77% of water.

2. The semi-solid grinding aid according to claim 1, wherein The semi-solid grinding aid comprises components with the following mass percentages: 65 - 78% of sodium polymethacrylate hydrogel, 8 - 15% of sodium pyrophosphate, 7 - 10% of polyacrylamide, 5 - 7% of sucrose, 1 - 1.5% of polyethylene glycol, and 1 - 2% of silane coupling agent KH-560.

3. The preparation method of the semi-solid grinding aid according to any one of claims 1 to 2, characterized in that, Comprising the following steps: Firstly, mix the sodium polymethacrylate hydrogel and polyethylene glycol to obtain a mixture; Secondly, mix the mixture with silane coupling agent KH-560, sucrose, polyethylene glycol polyacrylamide, and sodium pyrophosphate to obtain the semi-solid grinding aid.

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

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

6. Application of the semi-solid grinding aid according to any one of claims 1 - 2 or the semi-solid grinding aid prepared by the preparation method according to any one of claims 3 - 5 in the grinding of minerals.

7. The application according to claim 6, characterized in that, The minerals include one or more of quartz, calcium carbonate, barite, and wollastonite.

8. The application according to claim 6 or 7, characterized in that The incorporation amount of the semi-solid 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 semi-solid grinding aid is 0.05 - 0.15 wt%.