Integrated combined process for improving viscosity concentration of washed kaolin

Abstract

The invention discloses an integrated combined process for improving the viscosity concentration of washed kaolin, and relates to the technical field of kaolin processing, the integrated combined process for improving the viscosity concentration of washed kaolin comprises the following operation steps: S1, raw ore conveying and crushing treatment; s2, raw ore conveying and iron removal treatment; s3, superconductive slurry feeding raw materials; s6, carrying out filter pressing on the slurry feeding raw material; s7, optimizing parameters of the filter press; and S8, joint coordination control. According to the integrated combined process for improving the viscosity concentration of the washed kaolin, process parameters such as superconductive pulp feeding dispersion, superconductive impurity removal and chemical bleaching are researched; the viscosity concentration index is influenced by three key process parameters of pulp feeding, washing and squeezing of the filter press; the washing effect is judged by rapidly detecting the conductivity index of the filtered water of the filter press; the production efficiency of a filter pressing section is improved, the production cost is reduced, and optimized parameters for producing high-viscosity-concentration products are explored; meanwhile, data support is provided for subsequent production of products with different viscosity concentration index requirements, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of kaolin processing, in particular to an integrated combined process for improving the viscosity of washed kaolin. Background Art

[0002] Kaolin has unique properties and good crystallinity. It has a highly ordered hypothetical hexagonal flake structure, fine particle size, high whiteness, and high viscosity. It is a high-quality raw material for application areas such as paper coatings, paints and coatings, rubber fillers, ceramic blanks and glazes, refractory materials, and high-performance concrete additives. Kaolin is mainly used in the papermaking industry as paper fillers and surface coating pigments. Viscosity is an important indicator for evaluating the physical and chemical properties of kaolin, and its value determines the product positioning and application areas.

[0003] The existing viscosity of kaolin is determined by factors such as the degree of mineral weathering and geological origin. Kaolin products need to meet whiteness index requirements. The commonly used process is chemical bleaching, but the addition of chemicals in chemical bleaching will reduce the viscosity of kaolin by 2-3 points.

[0004] Therefore, in view of this, the existing structure and deficiencies were studied and improved, and an integrated combined process for increasing the viscosity of washed kaolin was proposed. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an integrated combined process for increasing the viscosity of washed kaolin, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: an integrated joint process for increasing the viscosity of water-washed kaolin, the integrated joint process for increasing the viscosity of water-washed kaolin comprising the following operating steps:

[0007] S1. Raw ore feeding and crushing:

[0008] After the kaolin ore is collected, it is transported through the feeding equipment. During the transportation process, the roller shaft of the transmission belt rotates so that the first gear drives the second gear to mesh and rotate, so that the rolling roller rotates along the surface of the transmission belt to crush the ore. During the rotation of the rolling roller, the transmission gear drives the gear at the end of the crankshaft to rotate, so that the crankshaft rotates, thereby causing the pressure strip to expand and contract on the surface of the rolling roller, and the pressure strip is distributed in a ring shape, thereby cooperating with the rotation of the rolling roller to further apply pressure to the ore to crush it;

[0009] S2. Iron removal treatment of raw ore feeding:

[0010] The ore is crushed and then continues to be transported. The other roller of the transmission belt rotates so that the third gear drives the fourth gear to rotate, so that the rotating roller rotates close to the surface of the ore. When the electromagnetic sheet rotates to the bottom of the rotating roller, it is powered on to absorb the iron in the ore. When the electromagnetic sheet absorbs the iron and moves to the upper right side of the rotating roller close to the discharge chute, it is powered off. At this time, the iron falls to the surface of the discharge chute and is transported to the designated position along its surface.

[0011] S3, Superconducting slurry raw materials:

[0012] After the raw ore is crushed and iron-removed, it is processed in turn through the following processes: slurrying, spiral sand removal, four-stage hydrocyclone classification, horizontal centrifugal classification, butterfly centrifugal concentration, superconducting impurity removal and chemical bleaching to obtain the superconducting slurry raw material;

[0013] S4. Optimization of filter press parameters:

[0014] The superconducting slurry raw materials are subjected to filter press treatment, and the filter press slurry pressure, washing pressure, washing time, tympanic membrane pressure and pressing time are studied and tested to optimize the operating parameters, thereby obtaining high-viscosity kaolin.

[0015] S5. Joint coordinated control:

[0016] The same experiment is carried out on the optimization of kaolin whiteness parameters and particle size parameters as in step S4, and then the operating parameters of each process equipment are deduced based on the required kaolin whiteness, particle size and viscosity concentration indicators. Kaolin with the required indicators can be obtained by jointly controlling the operating parameters of the corresponding process. The operating parameters of the corresponding process refer to the operating parameters of the equipment used in the corresponding process. The operating parameters are adjusted through the control panel of the equipment. The operating parameters include but are not limited to pressure, time, speed and temperature.

[0017] Furthermore, in step S3, sulfuric acid and hydrosulfite are added in the chemical bleaching process to reduce the trivalent iron in the kaolin to divalent iron to improve the whiteness.

[0018] Furthermore, in step S3, the superconducting impurity removal process can whiten and remove iron from kaolin, thereby reducing the amount of sulfuric acid and sodium hypochlorite used in the chemical bleaching process.

[0019] Furthermore, in step S4, the test conditions for optimizing the slurry inlet pressure are as follows:

[0020] Under the conditions of fixed washing time of 1800s, washing pressure of 0.8MPa, pressing time of 700s and tympanic membrane pressing pressure of 1.0MPa, the effects of different slurry inlet pressures on the viscosity and moisture content of kaolin filter cake were compared. The results are as follows: under the conditions of fixed other experimental conditions, the viscosity and moisture content of the filter cake gradually decreased with the increase of slurry inlet pressure;

[0021] Conclusion: The best slurry inlet pressure is 0.3MPa, at which time the moisture content and viscosity of the filter cake are better.

[0022] Furthermore, in step S4, the washing time optimization test conditions are as follows:

[0023] Under the conditions of washing pressure of 0.8MPa, pressing time of 700s and tympanic membrane pressing pressure of 1.0MPa, the effect of washing time on the viscosity and moisture content of kaolin filter cake was studied, and the washing effect was judged by combining the pH value, suspended matter content and conductivity of the washed filter water after washing.

[0024] Conclusion: Considering the viscosity, moisture content and production efficiency, the optimal washing time during production should be 1800s.

[0025] Furthermore, in step S4, the washing pressure optimization test conditions are as follows:

[0026] Under the conditions of slurry inlet pressure of 0.3Mpa, pressing time of 700s and tympanic membrane pressing pressure of 1.0MPa, the effects of washing pressure and washing time on the viscosity and moisture content of kaolin filter cake were studied, and the washing effect was judged by combining the pH value, suspended matter content and conductivity of the washing filtrate after washing. The test results are as follows: when other conditions are fixed, the viscosity of kaolin gradually increases with the increase of washing pressure; the pH value of the filtrate shows an upward trend with the increase of washing pressure; the suspended matter content and conductivity both show a downward trend with the increase of washing pressure;

[0027] Conclusion: Taking into account the durability of the filter cloth and the viscosity of the filter cake, the optimal washing pressure is 0.8 MPa.

[0028] Furthermore, in step S4, the conditions for optimizing the pressing time are as follows:

[0029] Under the conditions of slurry pressure of 0.3MPa, washing time of 1800s, washing pressure of 0.8MPa and tympanic membrane pressing pressure of 1.0MPa, the effect of pressing time on the viscosity and moisture content of kaolin filter cake was studied, and the washing effect was judged by the pH value and conductivity of the washing filtrate after washing. The test results are as follows. When other conditions are fixed, the viscosity of kaolin first decreases and then increases with the increase of pressing time, the pH value of the filtrate gradually decreases with the increase of pressing time, and the conductivity increases slowly with the increase of pressing time.

[0030] Conclusion: Taking into account the difficulty of cake unloading and production efficiency, the optimized pressing time is 700s.

[0031] Furthermore, in step S4, the tympanic membrane compression pressure optimization test conditions are as follows:

[0032] Under the conditions of slurry inlet pressure of 0.3MPa, washing time of 1800s, washing pressure of 0.8MPa and pressing time of 700s, the effect of pressing pressure on the viscosity and moisture content of kaolin filter cake was studied. The test results are as follows: when other conditions remain unchanged, the viscosity and moisture content of kaolin first increase and then decrease with the increase of pressing pressure, and both are within a relatively low error range;

[0033] Conclusion: The best tympanic membrane compression pressure is 0.9 MPa.

[0034] Furthermore, the feeding equipment includes a transmission belt, a roller end of the transmission belt is connected to a first gear, and the top of the first gear is meshed with a second gear, the side of the second gear is rotatably connected to a first support plate, and a rolling roller is fixed to the other side of the second gear, the end of the rolling roller is rotatably connected to a second support plate, and a fixed disk is provided on the side of the second support plate, the fixed disk is passed through the interior of the rolling roller, and the side of the fixed disk is distributed in a ring shape and is rotatably connected to a crank shaft, the surface of the crank shaft is sleeved with a pressure strip, and a transmission gear is provided on the inner wall of the rolling roller close to the second gear.

[0035] Furthermore, the other roller end of the transmission belt is connected to a third gear, the third gear is distributed parallel to the first gear, and the top of the third gear is meshed with a fourth gear, a rotating roller is fixed to the side of the fourth gear, and the surface of the rotating roller is in a ring shape and is fitted with an electromagnetic sheet, a discharge chute is provided on one side of the rotating roller, and the end structure of the discharge chute is adapted to the surface of the electromagnetic sheet.

[0036] The present invention provides an integrated combined process for increasing the viscosity of washed kaolin, which has the following beneficial effects:

[0037] 1. The integrated combined process for improving the viscosity concentration of water-washed kaolin, the optimized parameters of the filter press washing process are: slurry feeding time 6000s, slurry feeding pressure 0.3MPa, washing time 1800s, washing pressure 0.8MPa, pressing time 700s, pressing pressure 0.9MPa; the slurry feeding pressure is optimized from 0.6MPa to 0.3MPa, the kaolin content in the filtered water is reduced, and the service life of the filter cloth is increased; the washing time is optimized from 2100s to 1800s, and the filter press cycle is shortened; the kaolin is treated with the pressure washing process after the optimized parameters, and its kaolin viscosity concentration can be stabilized at more than 70%, which meets the requirements of the high-end papermaking industry for kaolin viscosity concentration and improves the added value of the product.

[0038] 2. This integrated process for improving the viscosity of washed kaolin studies process parameters such as superconducting slurry dispersion, superconducting impurity removal and chemical bleaching; judges the washing effect by quickly detecting the conductivity index of filtered water from the filter press; improves the production efficiency of the filter press section, reduces production costs, and explores the optimal parameters for producing high-viscosity concentration products; at the same time, provides data support for the subsequent production of products with different viscosity concentration requirements, thereby achieving the goal of reducing costs and increasing efficiency.

[0039] 3. The integrated combined process for increasing the viscosity of washed kaolin causes the crankshaft to rotate during the rotation of the rolling roller, thereby causing the pressure strip to expand and contract on the surface of the rolling roller to cooperate with the rotation of the rolling roller to further apply pressure to the raw ore to crush it, thereby preliminarily crushing large pieces of raw ore for subsequent processing, and the pressure strip expands and contracts during the rotation of the rolling roller to further increase the crushing pressure, thereby enhancing the crushing effect.

[0040] 4. In this integrated joint process for improving the viscosity of washed kaolin, when the electromagnetic sheet rotates to the bottom of the rotating roller, it is energized to adsorb the iron in the raw ore. When the electromagnetic sheet adsorbs the iron and selects to move to the upper right side of the rotating roller near the discharge chute, it is powered off. At this time, the iron falls onto the surface of the discharge chute and is transported to the designated position along its surface. In this way, the iron in the raw ore can be preliminarily removed and collected in one place for subsequent centralized processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the effect of the slurry inlet pressure on the viscosity and moisture content of the filter cake of the present invention;

[0042] Figure 2 Schematic diagram of the effect of washing time on filter cake viscosity and water content of the present invention;

[0043] Figure 3 It is a schematic diagram of the effect of the washing pressure on the viscosity and moisture of the filter cake of the present invention;

[0044] Figure 4 It is a schematic diagram of the effect of the pressing time on the viscosity and moisture of the filter cake of the present invention;

[0045] Figure 5 This is a schematic diagram of the effect of the squeezing time on the pH and conductivity of the filtered water of the present invention;

[0046] Figure 6 It is a schematic diagram of the effect of the pressing pressure on the viscosity and moisture of the filter cake of the present invention;

[0047] Figure 7 It is a schematic diagram of the front view structure of the transmission belt of the present invention;

[0048] Figure 8 It is a schematic diagram of the internal structure of the rolling roller of the present invention;

[0049] Fig. 9 It is a schematic diagram of the cross-sectional structure of the discharge chute of the present invention.

[0050] In the figure: 1. transmission belt; 2. first gear; 3. second gear; 4. first support plate; 5. rolling roller; 6. second support plate; 7. fixed plate; 8. crank shaft; 9. pressure bar; 10. third gear; 11. fourth gear; 12. rotating roller; 13. electromagnetic sheet; 14. discharge slide; 15. transmission gear. DETAILED DESCRIPTION

[0051] The following embodiments of the present invention are further described in detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0052] like Figure 1-Figure 9 As shown, the present invention provides a technical solution: an integrated combined process for increasing the viscosity of water-washed kaolin, the integrated combined process for increasing the viscosity of water-washed kaolin includes the following steps:

[0053] S1. Raw ore feeding and crushing:

[0054] After the kaolin ore is collected, it is transported through the feeding equipment. During the transportation process, the roller shaft of the transmission belt 1 rotates so that the first gear 2 drives the second gear 3 to mesh and rotate, so that the rolling roller 5 rotates on the surface of the transmission belt 1 to crush the ore. During the rotation of the rolling roller 5, the transmission gear 15 drives the gear at the end of the crankshaft 8 to rotate, so that the crankshaft 8 rotates, thereby causing the pressure strip 9 to expand and contract on the surface of the rolling roller 5, and the pressure strip 9 is distributed in a ring shape, thereby cooperating with the rotation of the rolling roller 5 to further apply pressure to the ore to crush it;

[0055] S2. Iron removal treatment of raw ore feeding:

[0056] The raw ore is crushed and then continues to be transported, while the other roller of the transport belt 1 rotates so that the third gear 10 drives the fourth gear 11 to rotate, so that the rotating roller 12 rotates close to the surface of the raw ore. When the electromagnetic sheet 13 rotates to the bottom of the rotating roller 12, it is powered on to absorb the iron in the raw ore. When the electromagnetic sheet 13 absorbs the iron and moves to the upper right side of the rotating roller 12 close to the discharge chute 14, it is powered off. At this time, the iron falls onto the surface of the discharge chute 14 and is transported to the designated position along its surface.

[0057] S3, Superconducting slurry raw materials:

[0058] After the crushing and iron removal, the raw ore is processed in turn through slurry pounding, spiral sand removal, four-stage hydrocyclone classification, horizontal centrifugal classification, butterfly centrifugal concentration, superconducting impurity removal and chemical bleaching process to obtain the press filter pulp feed raw material; among them, the superconducting impurity removal process can whiten and remove iron from kaolin to reduce the amount of sulfuric acid and insurance powder used in the chemical bleaching process; in the chemical bleaching process, sulfuric acid and insurance powder are added to reduce the trivalent iron in kaolin to divalent iron to improve whiteness;

[0059] Specifically, the specific operation and process conditions of slurrying are to slurry the kaolin particles using a slurrying machine or a slurrying rod, the slurrying pressure is controlled at 50-200 Newtons, the slurrying time is 5-10 minutes, and whether a second slurrying is required is determined according to the slurrying result, that is, the mud fineness. The slurrying is performed until the mud fineness reaches a preset value. After the slurrying is completed, the mud enters a static stage, and the static stage time is 6-24 hours, which is used to make the water content in the mud evenly distributed;

[0060] The specific operation and process conditions of spiral desanding are to put the static mud and auxiliary materials into the spiral desanding machine, control the feed amount, keep the solid content of the slurry at about 40-60%, and the spiral speed is between 400-550rpm to remove sand particles. After the primary desanding, secondary or multiple desanding can be carried out to further increase the concentration of kaolin.

[0061] The specific operation and process conditions of the four-stage hydrocyclone classification are as follows: feed solid content: 40-50%, first-stage hydrocyclone cyclone speed: 800-1000rpm, overflow concentration: 30-40%; second-stage hydrocyclone cyclone speed: 900-1100rpm, overflow concentration: 40-50%; third-stage hydrocyclone cyclone speed: 1000-1200rpm, overflow concentration: 50-60%; fourth-stage hydrocyclone cyclone speed: 1100-1300rpm, overflow concentration: 60-70%, first-stage hydrocyclone classification: remove coarse particles; second-stage hydrocyclone classification: remove medium particles; third-stage hydrocyclone classification: further remove fine particles; fourth-stage hydrocyclone classification: ultimately increase the slurry concentration;

[0062] The specific operation and process conditions of horizontal centrifugal classification are as follows: the raw material slurry enters the horizontal centrifugal classifier, and under the action of centrifugal force, the coarse particles settle to the bottom, the fine particles are discharged with the upper overflow liquid, and the bottom sediment is discharged through the scraper. The feed solid content is 40-50%, the rotation speed is 1500-2000rpm, and the feed rate is 0.5-2t / h·m 2 , classification effect: overflow concentration: 10-20%, bottom concentration: 60-70%;

[0063] The specific operation and process conditions of butterfly centrifugal concentration are as follows: the raw material slurry enters the butterfly centrifuge, and the solid particles in the slurry are separated under the action of high-speed centrifugation. The concentrated high-solid content slurry is discharged from the bottom, and the upper clarified liquid is discharged from the overflow port. The feed solid content is 30-40%, the rotation speed is 2500-3000rpm, and the feed rate is 1-3t / h·m 2 , separation effect: overflow concentration: 5-10%, bottom concentration: 60-70%;

[0064] The specific operation and process conditions of superconducting impurity removal are as follows: the raw material slurry enters the superconducting magnetic separator, and under the action of a strong magnetic field, the impurity particles are adsorbed and separated, and the separated kaolin slurry is discharged from the outlet, and the adsorbed impurity particles are cleaned regularly, wherein the feed solid content is 30-40%, the magnetic field strength is 0.8-1.2T, the slurry flow rate is 0.5-1.0m / s, the separation effect is: the discharge concentration is 50-60%, and the impurity removal rate is 90-95%;

[0065] The specific operation and process conditions of chemical bleaching are as follows: adding the washed kaolin slurry into a reaction tank, adding bleaching agents such as hydrogen peroxide, sodium hypochlorite, etc. as needed, carrying out chemical reaction under controlled temperature and pH conditions, washing and filtering after the reaction to remove impurities, and finally obtaining a white, concentrated kaolin slurry, wherein the feed solid content is 30-40%, the amount of bleaching agent is 0.5-2% (relative to the dry weight of kaolin), the reaction temperature is 40-60°C, the reaction time is 1-3 hours, and the pH value is 6-8;

[0066] Kaolin slurry classification and purification: spiral sand removal; the pressure of φ500 cyclone is 0.1±0.02MPa; the pressure of φ250 cyclone is 0.15±0.02MPa; the pressure of φ150 cyclone is 0.2±0.05MPa; the pressure of φ75 cyclone is 0.25±0.05MPa; the pressure of φ25 cyclone is 0.35±0.05MPa. The cyclones at each level are mainly used to adjust the pressure and continuously classify and purify; the relationship between the speed of the horizontal screw and the flow rate of the horizontal screw centrifuge classification corresponds to the particle size, controlling the -2 micron content at 88±2%, the overflow concentration of the horizontal screw is about 8%; the concentration of the disc centrifuge is about 28%;

[0067] Kaolin slurry dispersion: Mix the overflow slurry from the horizontal screw and the concentrated slurry from the disc separator in proportion to a concentration of 18±2%, add liquid alkali to adjust the slurry pH to 5.5-7.0, add 1.5-2.5‰ of sodium polyacrylate or sodium hexametaphosphate dispersant, adjust the slurry viscosity to below 150mPa.s, and make the slurry have better fluidity;

[0068] Superconducting iron and titanium magnetic staining impurities removal: slurry flow rate, 40-55 cubic meters per hour; slurry concentration 18-20%; magnetic field strength: 3T; iron and titanium removal rate: 20-30%; whiteness improvement: 2-5 points and chemical bleaching, that is, adding sulfuric acid to control the pulp pH at 1.8-2.2, adding insurance powder, that is, sodium thiosulfate, under acidic conditions to reduce the trivalent iron in kaolin to divalent iron, and controlling the whiteness after bleaching to be above 85%;

[0069] S4. Optimization of filter press parameters:

[0070] Conduct research and tests on the filter press's inlet pressure, washing pressure, washing time, tympanic membrane pressure and pressing time to optimize operating parameters and obtain high-viscosity kaolin;

[0071] Among them, the test conditions for optimizing the slurry inlet pressure are as follows:

[0072] The test results are as follows Figure 1 As shown in the figure, under the conditions of washing time 2100s, washing pressure 0.8MPa, pressing time 700s and tympanic membrane pressing pressure 1.0MPa, the effects of different slurry inlet pressures on the viscosity and moisture content of kaolin filter cake are compared. The results are as follows: under the condition of fixed other experimental conditions, the viscosity and moisture content of the filter cake gradually decrease with the increase of slurry inlet pressure. When the slurry inlet pressures are 0.3MPa and 0.4MPa respectively, the moisture content and viscosity index of the filter cake are similar, and the effect is better. When the slurry inlet pressure is low, the moisture content of the filter cake is high, the viscosity is large, and it is not easy to fall off; with the increase of slurry inlet pressure, the slurry inlet amount increases and the slurry layer thickness increases; the increase of slurry layer thickness will increase the filtration resistance and slow down the filtration speed, resulting in poor washing effect and reduced viscosity of the filter cake;

[0073] Conclusion: The best slurry pressure is 0.3MPa, at which the moisture content and viscosity of kaolin filter cake are the best;

[0074] The washing time optimization test conditions are as follows:

[0075] The test results are shown in Figure 2 As shown in Table 1, under the conditions of fixed washing time of 1800s, washing pressure of 0.8MPa, pressing time of 700s and tympanic membrane pressing pressure of 1.0MPa, the effect of washing time on the viscosity and moisture content of kaolin filter cake was studied, and the washing effect was judged by combining the pH value, suspended matter content and conductivity of the washing filtrate after washing; the test results are as follows: with the increase of washing time, the electrolyte content in the filter cake gradually decreases, and the viscosity of the filter cake increases; the pH value of the washing filtrate shows an upward trend, but the amplitude is not large. When the washing time is 1800s, the viscosity index of the filter cake is higher, the moisture content reaches the lowest value, and the effect is best;

[0076] Conclusion: Considering the viscosity, moisture content and production efficiency, the optimal washing time should be 1800s.

[0077] Table 1

[0078]

[0079] The washing pressure optimization test conditions are as follows:

[0080] The test results are shown in Figure 3 And Table 2, under the conditions of washing time 1800s, pulping pressure 0.3Mpa, pressing time 700s and tympanic membrane pressing pressure 1.0MPa, the effects of washing pressure and washing time on the viscosity and moisture content of kaolin filter cake were studied, and the washing effect was judged by combining the pH value, suspended matter content and conductivity of the washing filtrate after washing. The test results are as follows. From Table 2 and Figure 3 The analysis shows that, under fixed other conditions, the viscosity concentration of kaolin increases gradually with the increase of washing pressure; the pH value of the filtrate increases with the increase of washing pressure; the suspended matter content and conductivity both decrease with the increase of washing pressure. Under the condition of 0.8MPa washing pressure, the conductivity decreases significantly, and the washing effect is better. When the washing pressure is low, the vacuum degree in the filter press is low and the filtration speed is slow; with the increase of washing pressure, the filtration speed increases significantly, the washing efficiency increases, the salt ion content in the filter cake gradually decreases, and the viscosity concentration gradually increases; but when the washing pressure is too high, it will lead to an increase in capillary resistance, damage the filter cloth, and reduce the washing efficiency;

[0081] Conclusion: Taking into account the durability of the filter cloth and the viscosity of the filter cake, the optimal washing pressure is 0.8 MPa.

[0082] Table 2

[0083]

[0084] The conditions for optimizing the pressing time were as follows:

[0085] The test results are shown in Figure 4 and Figure 5 , under the conditions of slurry pressure of 0.3MPa, washing time of 1800s, washing pressure of 0.8MPa and tympanic membrane pressing pressure of 1.0MPa, the effect of pressing time on the viscosity and moisture content of kaolin filter cake was studied, and the washing effect was judged by combining the pH value and conductivity of the washing filtrate after washing. The test results are as follows. With other conditions fixed, the viscosity of kaolin first decreases and then increases with the increase of pressing time, but the change range is not large; the pH value of the filtrate gradually decreases with the increase of pressing time, and the conductivity increases slowly with the increase of pressing time, and the change range is small. The pressing time has little effect on the viscosity of the filter cake, the conductivity of the filtrate and the pH, and mainly affects the moisture content of the filter cake;

[0086] Conclusion: Taking into account the difficulty of cake unloading and production efficiency, the optimized pressing time is 700s.

[0087] The optimized test conditions for tympanic membrane compression pressure are as follows:

[0088] The test results are shown in Table 3 and Figure 6 , under the conditions of slurry inlet pressure of 0.3MPa, washing time of 1800s, washing pressure of 0.8MPa and pressing time of 700s, the effect of pressing pressure on the viscosity and moisture content of kaolin filter cake was studied. The test results are as follows: when other conditions are fixed, the viscosity and moisture content of kaolin first increase and then decrease with the increase of pressing pressure, but the change range is not large and is within a relatively low error range;

[0089] Conclusion: The best tympanic membrane compression pressure is 0.9 MPa.

[0090] Table 3

[0091]

[0092] S5. Joint coordinated control:

[0093] The same experiment is performed on the optimization of the filter press parameters in step S4, and the optimization of the kaolin whiteness parameters and the particle size parameters is performed. Then, the operating parameters of the equipment in each process are reversed based on the required kaolin whiteness, particle size, and viscosity concentration indicators. The kaolin with the required indicators can be obtained by jointly controlling the operating parameters of the corresponding process. The operating parameters of the corresponding process refer to the operating parameters of the equipment used in the corresponding process. The operating parameters are adjusted through the control panel of the equipment. The operating parameters include but are not limited to pressure, time, speed, and temperature.

[0094] Based on the above description, the following conclusions were drawn: the optimized parameters of the filter press washing process are: 6000s of pulping time, 0.3MPa of pulping pressure, 1800s of washing time, 0.8MPa of washing pressure, 700s of pressing time, and 0.9MPa of pressing pressure; the pulping pressure was optimized from 0.6MPa to 0.3MPa, which reduced the kaolin content in the filtered water and increased the service life of the filter cloth; the washing time was optimized from 2100s to 1800s, which shortened the filter press cycle; the kaolin viscosity concentration of kaolin treated by the pressure washing process after the optimized parameters can be stabilized at more than 70%, which meets the requirements of the high-end papermaking industry for the viscosity concentration of kaolin and improves the added value of the product;

[0095] At the same time, by studying the influence of the three key process parameters of filter press feeding, washing and pressing on the viscosity concentration index; by quickly detecting the conductivity index of the filtered water of the filter press, the washing effect is judged; the production efficiency of the filter press section is improved, the production cost is reduced, and the optimal parameters for producing high viscosity concentration products are explored; at the same time, data support is provided for the subsequent production of products with different viscosity concentration index requirements, so as to achieve the purpose of reducing costs and increasing efficiency.

[0096] The feeding device includes a transmission belt 1, a roller shaft end of the transmission belt 1 is connected to a first gear 2, and a second gear 3 is meshed on the top of the first gear 2, a first support plate 4 is rotatably connected to the side of the second gear 3, and a rolling roller 5 is fixed to the other side of the second gear 3, an end of the rolling roller 5 is rotatably connected to a second support plate 6, and a fixed plate 7 is provided on the side of the second support plate 6, the fixed plate 7 is penetrated inside the rolling roller 5, and the side of the fixed plate 7 is distributed in a ring shape and is rotatably connected to a crank shaft 8, a pressure strip 9 is sleeved on the surface of the crank shaft 8, and a transmission gear 15 is provided on the inner wall of the rolling roller 5 close to the second gear 3;

[0097] The specific operation is as follows: after the kaolin ore is collected, it is transmitted through the feeding equipment. During the transmission process, the roller shaft of the transmission belt 1 rotates so that the first gear 2 drives the second gear 3 to rotate in meshing, so that the rolling roller 5 rotates along the surface of the transmission belt 1 to crush the ore. During the rotation of the rolling roller 5, the fixed plate 7 rotates synchronously therewith, and the transmission gear 15 drives the gear at the end of the crank shaft 8 through the motor drive to rotate, so that the crank shaft 8 rotates, thereby making the pressure strip 9 expand and contract on the surface of the rolling roller 5, and the pressure strip 9 is distributed in a ring shape, thereby cooperating with the rotation of the rolling roller 5 to further apply pressure to the ore to crush it, thereby preliminarily crushing large pieces of ore for subsequent processing, and the pressure strip 9 expands and contracts during the rotation of the rolling roller 5 to further increase the crushing force, thereby enhancing the crushing effect.

[0098] The other roller end of the transmission belt 1 is connected to a third gear 10, which is distributed in parallel with the first gear 2, and a fourth gear 11 is meshed on the top of the third gear 10, a rotating roller 12 is fixed to the side of the fourth gear 11, and an electromagnetic sheet 13 is attached to the surface of the rotating roller 12 in a ring shape, and a discharge chute 14 is provided on one side of the rotating roller 12, and the end structure of the discharge chute 14 is adapted to the surface of the electromagnetic sheet 13;

[0099] The specific operation is as follows: the raw ore continues to be transmitted after being crushed, and the other roller of the transmission belt 1 rotates so that the third gear 10 drives the fourth gear 11 to rotate, so that the rotating roller 12 rotates close to the surface of the raw ore, and when the electromagnetic sheet 13 rotates to the bottom of the rotating roller 12, it is energized to adsorb the iron in the raw ore, and when the electromagnetic sheet 13 adsorbs the iron and selects to the upper right side of the rotating roller 12 near the discharge chute 14, it is powered off. At this time, the iron falls to the surface of the discharge chute 14 and is transported to the designated position along its surface, thereby preliminarily removing the iron in the raw ore and collecting it in one place for subsequent centralized processing.

[0100] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. An integrated combined process for increasing the viscosity of washed kaolin, characterized in that: The integrated combined process for increasing the viscosity of washed kaolin comprises the following steps: S1. Raw ore feeding and crushing: After the kaolin ore is collected, it is transported through a feeding device. During the transport process, the roller shaft of the transport belt (1) rotates so that the first gear (2) drives the second gear (3) to mesh and rotate, thereby causing the rolling roller (5) to rotate against the surface of the transport belt (1) to crush the ore. During the rotation of the rolling roller (5), the transmission gear (15) drives the gear at the end of the crankshaft (8) to rotate, causing the crankshaft (8) to rotate, thereby causing the pressure strip (9) to expand and contract on the surface of the rolling roller (5), and the pressure strip (9) is distributed in a ring shape, thereby cooperating with the rotation of the rolling roller (5) to further apply pressure to the ore to crush it. S2. Iron removal treatment of raw ore feeding: After the raw ore is crushed, it continues to be transmitted, and the other roller of the transmission belt (1) rotates so that the third gear (10) drives the fourth gear (11) to rotate, so that the rotating roller (12) rotates close to the surface of the raw ore. When the electromagnetic sheet (13) rotates to the bottom of the rotating roller (12), it is energized to absorb the iron in the raw ore. When the electromagnetic sheet (13) absorbs the iron and selects to the upper right side of the rotating roller (12) close to the discharge chute (14), it is de-energized, and the iron falls onto the surface of the discharge chute (14) and is transported to a designated position along the surface. S3, Superconducting slurry raw materials: After the raw ore is crushed and iron-removed, it is processed in turn through pulping, spiral sand removal, four-stage hydrocyclone classification, horizontal centrifugal classification, butterfly centrifugal concentration, superconducting impurity removal and chemical bleaching process to obtain superconducting slurry raw materials; S4. Optimization of filter press washing parameters: The superconducting slurry raw materials were subjected to filter press treatment, and the slurry feed pressure, washing pressure, washing time, tympanic membrane pressure and pressing time of the filter press were studied and tested to optimize the operating parameters, thereby obtaining high-viscosity kaolin; S5. Joint coordinated control: The same experiment is carried out on the optimization of kaolin whiteness parameters and particle size parameters as in the optimization of filter press parameters in step S4. Then, the operating parameters of each process equipment are reversed based on the required kaolin whiteness, particle size and viscosity concentration indicators. Kaolin with the required indicators can be obtained by jointly controlling the filter press parameters in step S4 through the control panel of the equipment.

2. The integrated combined process for increasing the viscosity of washed kaolin according to claim 1, characterized in that: In step S3, sulfuric acid and hydrosulfite are added in the chemical bleaching process to reduce the trivalent iron in the kaolin to divalent iron to improve the whiteness.

3. The integrated combined process for increasing the viscosity of washed kaolin according to claim 1, characterized in that: In step S3, the superconducting impurity removal process can whiten and remove iron from kaolin, thereby reducing the amount of sulfuric acid and hydrosulfite used in the chemical bleaching process.

4. The integrated combined process for increasing the viscosity of washed kaolin according to claim 1, characterized in that: In step S4, the washing time is 1800s, the washing pressure is 0.8MPa, the pressing time is 700s, the tympanic membrane pressing pressure is 0.9MPa, and the pulp feeding pressure is 0.3MPa.

5. The integrated combined process for increasing the viscosity of washed kaolin according to claim 1, characterized in that: The feeding equipment comprises a transmission belt (1), a roller shaft end of the transmission belt (1) is connected to a first gear (2), and the top of the first gear (2) is meshed with a second gear (3), the side of the second gear (3) is rotatably connected to a first support plate (4), and a rolling roller (5) is fixed to the other side of the second gear (3), the end of the rolling roller (5) is rotatably connected to a second support plate (6), and a fixed disk (7) is provided on the side of the second support plate (6), the fixed disk (7) is inserted into the interior of the rolling roller (5), and the side of the fixed disk (7) is distributed in a ring shape and is rotatably connected to a crank shaft (8), the surface of the crank shaft (8) is sleeved with a pressure strip (9), and a transmission gear (15) is provided on the inner wall of the rolling roller (5) close to the second gear (3).

6. The integrated combined process for increasing the viscosity of washed kaolin according to claim 1, characterized in that: The other roller end of the transmission belt (1) is connected to a third gear (10), the third gear (10) is arranged in parallel with the first gear (2), and a fourth gear (11) is meshed on the top of the third gear (10), a rotating roller (12) is fixed to the side of the fourth gear (11), and an electromagnetic sheet (13) is attached to the surface of the rotating roller (12) in a ring shape, and a discharge chute (14) is provided on one side of the rotating roller (12), and the end structure of the discharge chute (14) is adapted to the surface of the electromagnetic sheet (13).

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