Method for recovering electrically fused zirconia cyclone dust and application thereof

Abstract

The present application relates to the technical field of mineral processing, and in particular, relates to a method for recovering electrically fused zirconia cyclone dust and application thereof. The method for recovering electrically fused zirconia cyclone dust comprises the following steps: mixing electrically fused zirconia cyclone dust with water to form a slurry, and then performing gravity separation roughing to obtain gravity separation roughing concentrate and gravity separation roughing tailings; performing gravity separation scavenging on the gravity separation roughing tailings to obtain gravity separation scavenging concentrate; mixing the gravity separation scavenging concentrate and the gravity separation roughing concentrate, and then performing screening to obtain oversize and undersize; performing gravity separation cleaning on the oversize to obtain gravity separation cleaning concentrate and gravity separation cleaning tailings; mixing the undersize with a collector solution and a foaming agent, and then performing reverse flotation roughing to obtain reverse flotation roughing concentrate and reverse flotation roughing tailings; and mixing the reverse flotation roughing concentrate and the gravity separation cleaning concentrate to obtain zircon concentrate. The method can efficiently recover zircon concentrate, and improve the economic added value of electrically fused zirconia cyclone dust waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore dressing, in particular to a method for recycling of fused zirconia cyclone dust and application thereof. BACKGROUND

[0002] Zirconia has excellent properties such as high temperature resistance, corrosion resistance, wear resistance, good thermal stability, high refractive index and good thermal shock resistance, and is widely used in structural ceramics and functional ceramics, and is a rapidly developing industry in the field of new materials. There are two main production processes for zirconia, namely chemical method and electric melting method. The chemical method has long process flow, large reagent consumption and high cost, which limits its development. Although the product performance of the electric melting method is slightly worse than that of the chemical method, the process is simple, the flow is short and the cost is low, so the electric melting method has become the mainstream method for producing zirconia.

[0003] Fused zirconium is produced by controlling the amount of carbon and catalyst in the electric arc furnace high-temperature smelting to separate silicon from zircon sand at high temperature according to the principle of high-temperature carbonization reduction of zircon sand. The specific chemical reaction is:

[0004] SiO2(s)+C(s)=SiO(g)+CO(g).

[0005] That is, silicon is reduced to a gaseous form and discharged from the flue gas pipeline. In this process, a small part of zirconium silicate, zirconia and silicon dioxide are entrained in the form of solid small particles. In industry, this part of solid is collected by a cyclone separator and is called fused zirconia cyclone dust. The main components of the fused zirconia cyclone dust include zirconium silicate, zirconia and silicon dioxide, and there are also a small amount of oxide impurities of iron, titanium, sodium, calcium, etc. The overall particle size is fine, and the 160-mesh undersize is more than 60%.

[0006] Due to the presence of a large amount of silicon dioxide in the cyclone dust, the fused zirconia cyclone dust cannot be directly utilized and is only stacked as solid waste, resulting in waste of resources.

[0007] Therefore, the present application is proposed. SUMMARY

[0008] The first object of the present application is to provide a method for recycling of fused zirconia cyclone dust, which obtains zircon concentrate by recycling the fused zirconia cyclone dust, thereby improving the economic added value of the fused zirconia cyclone dust waste and avoiding waste of resources.

[0009] The second object of the present application is to provide the application of the zircon concentrate prepared by the method for recycling of fused zirconia cyclone dust in the preparation of ceramics, medical materials, refractory materials, high-temperature resistant materials and electrolyte materials.

[0010] In order to achieve the above objects of the present application, the following technical solutions are adopted:

[0011] The application first provides a recovery method of electrofusion zirconia cyclone dust, comprising the following steps:

[0012] (a) after mixing the electrofusion zirconia cyclone dust with water to form a slurry, performing gravity roughing separation to obtain gravity roughing concentrate and gravity roughing tailings; performing gravity scavenging separation on the gravity roughing tailings to obtain gravity scavenging concentrate; mixing the gravity scavenging concentrate and the gravity roughing concentrate and performing screening to obtain oversize and undersize;

[0013] (b) performing gravity concentration on the oversize to obtain gravity concentration concentrate and gravity concentration tailings;

[0014] (c) mixing the undersize with a collector solution and a frother and performing reverse flotation roughing separation to obtain reverse flotation roughing concentrate and reverse flotation roughing tailings; mixing the reverse flotation roughing concentrate with the gravity concentration concentrate obtained in step (b) and performing solid-liquid separation to obtain zircon concentrate;

[0015] The electrofusion zirconia cyclone dust is dust generated in the production of electrofusion zirconia, and the main components of the electrofusion zirconia cyclone dust include zirconium silicate, zirconium dioxide and silicon dioxide.

[0016] The application further provides application of the zircon concentrate prepared by the recovery method of electrofusion zirconia cyclone dust in the preparation of ceramics, medical materials, refractory materials, high-temperature-resistant materials and electrolyte materials.

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] (1) The recovery method of electrofusion zirconia cyclone dust provided by the application can prepare zircon concentrate by recovering electrofusion zirconia cyclone dust, improve the economic added value of electrofusion zirconia cyclone dust waste, and avoid waste of resources.

[0019] (2) The recovery method of electrofusion zirconia cyclone dust provided by the application can obtain zircon concentrate with zirconium dioxide content higher than 60% by performing gravity roughing separation, gravity scavenging separation, screening classification, gravity concentration on coarse particle oversize and reverse flotation roughing separation on fine particle undersize.

[0020] (3) The recovery method of electrofusion zirconia cyclone dust provided by the application can maximize the effective recovery and utilization of zirconium and other zircon-related valuable elements, ensure the overall zircon yield, and improve the overall resource recovery rate.

[0021] (4) The recovery method of electrofusion zirconia cyclone dust provided by the application has a simple process, low cost and is suitable for batch continuous production. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0023] Figure 1 The process flow diagram of the method for recovering the electrically fused zirconia cyclone dust provided in Embodiment 1 of the present application is shown in the figure. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely in combination with the drawings and specific embodiments. However, those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, but not all the embodiments, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application. The specific conditions not mentioned in the embodiments are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not marked with the manufacturer, which are conventional products that can be purchased in the market.

[0025] If not specifically stated, in the present application, "first aspect", "second aspect", "third aspect", "fourth aspect" and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance or quantity, nor can it be understood as implying the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth" and the like only serve the purpose of non-exhaustive enumeration description, and should be understood as not constituting a closed limitation on the quantity.

[0026] If not specifically stated, the "includes" and "contains" mentioned in the present application mean open-ended, and can also be closed. For example, the "includes" and "contains" can mean that other components not listed can also be included or contained, or only the listed components can be included or contained.

[0027] If not specifically stated, in the present application, "one or more" or "at least one" means any one, any two or any two or more of the listed items. Among them, "several" means any two or more.

[0028] In the first aspect, the present application provides a method for recovering electrically fused zirconia cyclone dust, comprising the following steps:

[0029] (a) mixing the electrically fused zirconia cyclone dust with water to form a slurry, and then performing rough gravity separation to obtain a rough gravity separation concentrate and a rough gravity separation tailing; performing a sweep gravity separation on the rough gravity separation tailing to obtain a sweep gravity separation concentrate; mixing the sweep gravity separation concentrate and the rough gravity separation concentrate and performing a screening to obtain a screening oversize and a screening undersize.

[0030] The screening oversize refers to the material that cannot pass through the screen and is retained on the screen.

[0031] The screening undersize refers to the material that can pass through the screen.

[0032] (b) performing a gravity separation on the screening oversize to obtain a gravity separation concentrate and a gravity separation tailing.

[0033] (c) mixing the screening undersize obtained in step (a) with a collector solution and a frother, and performing a reverse flotation rough separation to obtain a reverse flotation rough separation concentrate and a reverse flotation rough separation tailing; mixing the reverse flotation rough separation concentrate and the gravity separation concentrate obtained in step (b), and performing a solid-liquid separation, and then drying to obtain a zircon concentrate.

[0034] The electrically fused zirconia cyclone dust is dust generated in the process of preparing electrically fused zirconia, and the main components of the electrically fused zirconia cyclone dust include zirconium silicate, zirconium dioxide and silicon dioxide.

[0035] In some specific embodiments, the electrically fused zirconia cyclone dust also contains a small amount of oxide impurities of iron, titanium, sodium and calcium.

[0036] More specifically, the electrically fused zirconia cyclone dust refers to the cyclone dust obtained by collecting small solid particles through a cyclone separator in the process of preparing electrically fused zirconia by the principle of high-temperature carbonization reduction of zircon sand to remove silicon. The electrically fused zirconia cyclone dust has a fine particle size, and the undersize of 160 mesh is more than 60 wt.%.

[0037] The present application is based on the characteristics that the main components of the electrically fused zirconia cyclone dust are zirconia and silicon dioxide, and that a large part of the particles are fine particles. After rough gravity separation of the cyclone dust, coarse and fine particle classification is performed to achieve the purpose of using the most suitable separation method for different particle sizes.

[0038] Furthermore, the present application uses the method of gravity separation-screening-reverse flotation, and first removes silicon by gravity separation once, and then removes silicon by reverse flotation of fine particles after screening of coarse particles, so that the zircon content of the zircon concentrate obtained by recovery can be improved.

[0039] The recovery method can obtain high-grade zircon concentrate with high zircon yield, which not only improves the economic added value of the electrically fused zirconia cyclone dust waste, but also avoids waste of resources.

[0040] The principle of the method for recovering the electrically fused zirconia cyclone dust provided by the application is as follows:

[0041] The main components of the electrically fused zirconia cyclone dust are zirconium silicate, zirconia and silicon dioxide, and the three phases have no magnetism and no conductivity. Therefore, the zirconium element cannot be effectively enriched by the magnetic separation and electric separation in the common mineral separation method. The zirconium silicate and the zirconia have obvious differences in specific gravity and density from the silicon dioxide. The gravity separation can be used as a roughing method to preliminarily recover the zirconium silicate and the zirconia. However, the gravity separation roughing concentrate cannot completely recover the zirconium silicate and the zirconia, and cannot completely remove the silicon dioxide. Therefore, the gravity separation tailings are subjected to the cleaning separation in the application to improve the overall zirconium recovery rate. The gravity separation roughing concentrate and the gravity separation cleaning concentrate are first subjected to the screening classification. The screening upper material has a relatively coarse particle size, and the gravity separation cleaning can achieve a good effect of enriching the zirconium and removing the silicon. The screening lower material has a relatively fine particle size, and the reverse flotation roughing can float the silicon dioxide by adding appropriate flotation reagents. The gravity separation cleaning concentrate and the reverse flotation roughing concentrate are combined to obtain the high-quality zirconium concentrate. The gravity separation has a better separation effect on the relatively coarse particle size minerals, and the flotation has a better separation effect on the fine particle size minerals. Therefore, the gravity separation roughing concentrate and the gravity separation cleaning concentrate are screened into coarse and fine particle sizes for the separation to obtain the best separation effect.

[0042] The method for recovering the electrically fused zirconia cyclone dust provided by the application can be continuously produced.

[0043] In some specific embodiments, the gravity separation cleaning tailings in step (b) are collected and subjected to the gravity separation cleaning again. In this way, the zirconium recovery rate can be further improved.

[0044] That is, the gravity separation cleaning tailings are mixed with the next batch of gravity separation roughing tailings, and the gravity separation cleaning is performed again.

[0045] In some specific embodiments, the reverse flotation roughing tailings in step (b) are collected and subjected to the reverse flotation cleaning to obtain the reverse flotation cleaning concentrate; the reverse flotation cleaning concentrate is recovered and subjected to the reverse flotation roughing again.

[0046] That is, the reverse flotation cleaning concentrate is mixed with the next batch of screening lower material, and the reverse flotation roughing is performed again.

[0047] The reverse flotation cleaning tailings still have a relatively high zirconium content. To avoid introducing too much silicon dioxide into the upper flotation system, the reverse flotation cleaning can be performed on the reverse flotation cleaning tailings to remove part of the silicon dioxide, and then the reverse flotation cleaning concentrate is returned to the upper flotation system to improve the overall zirconium recovery rate.

[0048] In some specific embodiments, 50-150 g / t of the collector and 80-150 g / t of the frother are added during the reverse flotation cleaning.

[0049] In some embodiments, the collector and / or frother used in the reverse flotation scavenging process is the same as the collector and / or frother used in the reverse flotation roughing process.

[0050] In order to further comprehensively consider the zircon concentrate grade and the zircon recovery rate, the present application optimizes the parameters in the recovery process, such as the stroke and frequency of the gravity separation, the mesh number of the screening, the type and amount of the collector and frother, and the concentration of the slurry.

[0051] In some embodiments, in step (a), the mass fraction of the electro-fused zirconia cyclone dust in the slurry is 25% to 40%, including but not limited to any one of 25%, 28%, 30%, 32%, 35%, 38%, 40%, or a range value between any two of them.

[0052] In some embodiments, in step (a), the stroke of the gravity separation roughing is 15 to 25 mm, including but not limited to any one of 15 mm, 18 mm, 20 mm, 23 mm, 25 mm, or a range value between any two of them.

[0053] In some embodiments, in step (a), the frequency of the gravity separation roughing is 200 to 300 times / min, including but not limited to any one of 200 times / min, 220 times / min, 250 times / min, 280 times / min, 300 times / min, or a range value between any two of them.

[0054] In some embodiments, in step (a), the stroke of the gravity separation scavenging is 10 to 20 mm, including but not limited to any one of 10 mm, 13 mm, 15 mm, 18 mm, 20 mm, or a range value between any two of them.

[0055] In some embodiments, in step (a), the frequency of the gravity separation scavenging is 250 to 350 times / min, including but not limited to any one of 250 times / min, 280 times / min, 300 times / min, 330 times / min, 350 times / min, or a range value between any two of them.

[0056] In some embodiments, in step (a), the mesh number of the screen used for screening is 120 to 200 meshes, including but not limited to any one of 120 meshes, 130 meshes, 150 meshes, 180 meshes, 200 meshes, or a range value between any two of them.

[0057] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0058] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0059] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0060] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0061] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0062] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0063] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0064] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0065] In some embodiments, the preparation method of the collector solution comprises: uniformly mixing the collector and acetic acid to obtain a collector solution with a mass fraction of 1%-5%.

[0066] In some embodiments, the re-selecting and fine selecting stroke in step (b) is 20-30 mm, including but not limited to any one of 20 mm, 22 mm, 24 mm, 25 mm, 27 mm, 29 mm, 30 mm, or a range value between any two of them.

[0067] In some specific embodiments, in step (c), the amount of the frother added is 400-800 g / t, including but not limited to any one of 400 g / t, 450 g / t, 500 g / t, 550 g / t, 600 g / t, 650 g / t, 700 g / t, 750 g / t, 800 g / t, or a range between any two of them.

[0068] That is, the mass of the frother solution added per t of the underflow-containing ore slurry is 400-800 g.

[0069] In some specific embodiments, in step (c), the main components of the zirconium concentrate include zirconium silicate and zirconium dioxide.

[0070] In some specific embodiments, in step (c), the grade of the zirconium concentrate is ≥62% in terms of ZrO2, including but not limited to any one of 62%, 63%, 64%, 65%, 66%, 67%, 68%, 70%, or a range between any two of them.

[0071] In some specific embodiments, in step (c), the recovery rate of the zirconium concentrate is ≥87% in terms of ZrO2, including but not limited to any one of 87%, 88%, 89%, 90%, 91%, 92%, 93%, 95%, or a range between any two of them.

[0072] The use of the above-mentioned parameters such as the gravity separation stroke and frequency, the screening mesh size, the type and amount of the collector and the frother, and the ore slurry concentration is conducive to further improving the grade of the zirconium concentrate and the zirconium recovery rate.

[0073] In some specific embodiments, in step (a), the gravity separation roughing is performed using a shaking table, a spiral chute, or the like, but is not limited thereto, and preferably a shaking table is used.

[0074] In some specific embodiments, in step (a), the gravity separation scavenging is performed using a shaking table, a spiral chute, or the like, but is not limited thereto, and preferably a shaking table is used.

[0075] In some specific embodiments, in step (b), the gravity separation cleaning is performed using a shaking table, a spiral chute, or the like, but is not limited thereto, and preferably a shaking table is used.

[0076] In a second aspect, the present application provides a use of the zirconium concentrate prepared by the above-mentioned method for recovering the electrically fused zirconia cyclone dust in the preparation of ceramics, medical materials, refractory materials, high-temperature-resistant materials, and electrolyte materials.

[0077] The embodiments of the present application will be described in detail below with reference to Examples, but those skilled in the art will understand that the following Examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application. The specific conditions not specified in the Examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, and are all conventional products that can be obtained commercially.

[0078] In order to compare the grade and zirconium recovery rate of the zirconium concentrate recovered in each group, the fused zirconia cyclone dust used in the following Examples and Comparative Examples of the present application is the same batch of material, which is the dust collected during the production of fused zirconia. The main components of the fused zirconia cyclone dust include zirconium silicate, zirconium dioxide and silicon dioxide, wherein the mass percentage of zirconium silicate and zirconium dioxide is 37.91% based on ZrO2, and the mass percentage of zirconium silicate and silicon dioxide is 57.27% based on SiO2. The fused zirconia cyclone dust also contains Na2O 0.98% and Fe2O3 1.04%, and the balance is impurities (mainly oxides of aluminum, potassium, calcium, titanium and the like). However, the fused zirconia cyclone dust that can be recycled by the present application is not limited to this, and the above chemical composition should not be regarded as limiting the scope of the present application.

[0079] Example 1

[0080] The method for recovering the fused zirconia cyclone dust provided in this embodiment includes the following steps:

[0081] (1) The cyclone dust is mixed and stirred with water to prepare a slurry with a mass fraction of 30%, and then heavy separation roughing is carried out in a shaking table, with a stroke of 20 mm and a stroke frequency of 250 times / min, to obtain a heavy separation roughing concentrate and a heavy separation roughing tailing.

[0082] The heavy separation roughing tailing is subjected to shaking table heavy separation scavenging, with a stroke of 15 mm and a stroke frequency of 300 times / min, to obtain a heavy separation scavenging concentrate and a heavy separation scavenging tailing (the heavy separation scavenging tailing is useless and is discarded).

[0083] The heavy separation roughing concentrate and the heavy separation scavenging concentrate are combined, and then wet screening is carried out, using a screen mesh with a mesh size of 160 meshes, to obtain oversize and undersize.

[0084] (2) The oversize obtained in step (1) is subjected to shaking table heavy separation cleaning, with a stroke of 25 mm and a stroke frequency of 200 times / min, to obtain a heavy separation cleaning concentrate and a heavy separation cleaning tailing. The heavy separation cleaning tailing is collected and re-enters the heavy separation process.

[0085] (3) The undersize of step (1) is mixed with water to obtain a slurry with a mass fraction of 40%, and a collector solution and a frother are added to the slurry to perform reverse flotation roughing in a flotation tank, wherein the collector is a 2% by mass acetic acid solution of dodecylamine polyoxyethylene ether, the amount of the collector added is 500 g / t, the frother is pine oil, and the amount of the frother added is 600 g / t, to obtain a reverse flotation roughing concentrate and a reverse flotation roughing tailing.

[0086] The reverse flotation scavenging is performed on the flotation roughing tailing, and a 2% by mass acetic acid solution of dodecylamine polyoxyethylene ether is added to the reverse flotation scavenging at a rate of 100 g / t, and a secondary octanol frother is added to the reverse flotation scavenging at a rate of 120 g / t, to obtain a reverse flotation scavenging concentrate and a reverse flotation scavenging tailing (the reverse flotation scavenging tailing is useless and discarded), and the reverse flotation scavenging concentrate is recovered and re-entered into the flotation system.

[0087] The gravity separation concentrate obtained in step (2) is combined with the reverse flotation roughing concentrate, and then filtered and dried to obtain a zircon concentrate. The main components of the zircon concentrate are zirconium silicate and zirconium dioxide.

[0088] The recovery method of the electrically fused zirconia cyclone dust provided in the embodiment is shown in FIG. 1. Figure 1

[0089] It is detected that the grade of the zircon concentrate is 66.41% in terms of ZrO2, and the recovery rate of the zircon concentrate is 90.53% in terms of ZrO2.

[0090] Example 2

[0091] The recovery method of the electrically fused zirconia cyclone dust provided in the embodiment is basically the same as that in Example 1, except that in step (1), the cyclone dust is mixed with water to be stirred and pulped to obtain a slurry with a mass fraction of 35%, and the mesh size of the screen used in the subsequent wet screening is 200 mesh; and in step (3), the undersize is mixed with water to obtain a slurry with a mass fraction of 45%.

[0092] The main components of the zircon concentrate prepared in the embodiment are zirconium silicate and zirconium dioxide. It is detected that the grade of the zircon concentrate is 64.83% in terms of ZrO2, and the recovery rate of the zircon concentrate is 88.15% in terms of ZrO2.

[0093] Example 3

[0094] The recovery method of the electrically fused zirconia cyclone dust provided in the embodiment is basically the same as that in Example 1, except that in step (1), the stroke of the gravity separation roughing is 18 mm, and the stroke frequency is 275 times / min, and the stroke of the gravity separation scavenging is 18 mm, and the stroke frequency is 275 times / min; and in step (2), the stroke of the gravity separation cleaning is 22 mm, and the stroke frequency is 225 times / min.

[0095] ​The main components of the zirconium concentrate prepared in the embodiment are zirconium silicate and zirconium dioxide. The detection shows that the grade of the zirconium concentrate is 63.37% in terms of ZrO2, and the recovery rate of the zirconium concentrate is 87.48% in terms of ZrO2.

[0096] Example 4

[0097] The method for recovering the fused zirconia cyclone dust provided in the embodiment is basically the same as that in Example 1, except that in step (3), the adding amount of the collector is 400 g / t, and the adding amount of the frother is 500 g / t in the reverse flotation roughing process; and the adding amount of the collector is 75 g / t, and the adding amount of the frother is 100 g / t in the reverse flotation scavenging process.

[0098] The main components of the zirconium concentrate prepared in the embodiment are zirconium silicate and zirconium dioxide. The detection shows that the grade of the zirconium concentrate is 62.71% in terms of ZrO2, and the recovery rate of the zirconium concentrate is 88.06% in terms of ZrO2.

[0099] Example 5

[0100] The method for recovering the fused zirconia cyclone dust provided in the embodiment is basically the same as that in Example 1, except that in step (3), the collector solution is a 2% dodecyl propyl ether amine acetic acid solution by mass fraction, and the frother is sec-octyl alcohol in the reverse flotation roughing process.

[0101] The main components of the zirconium concentrate prepared in the embodiment are zirconium silicate and zirconium dioxide. The detection shows that the grade of the zirconium concentrate is 64.29% in terms of ZrO2, and the recovery rate of the zirconium concentrate is 87.84% in terms of ZrO2.

[0102] Comparative Example 1

[0103] The method for recovering the fused zirconia cyclone dust provided in the comparative example is basically the same as that in Example 1, except that in step (1), the wet screening is not performed, and the gravity separation roughing concentrate and the gravity separation scavenging concentrate are combined and directly subjected to the table gravity separation cleaning of step (2); and in step (3), the reverse flotation roughing is not performed, and the table gravity separation cleaning concentrate obtained in step (2) is directly subjected to the filter pressing and drying to obtain the zirconium concentrate.

[0104] The main components of the zirconium concentrate prepared in the comparative example are zirconium silicate and zirconium dioxide. The detection shows that the grade of the zirconium concentrate is 52.34% in terms of ZrO2, and the recovery rate of the zirconium concentrate is 68.29% in terms of ZrO2.

[0105] Comparative Example 2

[0106] The recovery method of the electrically fused zirconia cyclone dust provided by the comparative example is basically the same as that of example 1, except that in step (1), no wet screening is performed, and no table re-concentration is performed in step (2), but the re-concentration rough concentrate is combined with the re-concentration scavenging concentrate, and then the reverse flotation rough concentration of step (3) is performed, and the reverse flotation rough concentrate is pressure filtered and dried to obtain the zircon concentrate.

[0107] The main components of the zircon concentrate prepared by the comparative example are zirconium silicate and zirconium dioxide. The detection shows that the grade of the zircon concentrate is 52.72% in terms of ZrO2, and the recovery rate of the zircon concentrate is 71.53% in terms of ZrO2.

[0108] As can be seen by comparing example 1, comparative example 2 and comparative example 2, the steps of screening, re-concentration and reverse flotation rough concentration all have substantial effects on the grade of the zircon concentrate and the recovery rate of the zircon concentrate. Comparative example 1 and comparative example 2 do not perform the operations of screening, re-concentration and reverse flotation rough concentration, which results in a significant decrease in the grade of the zircon concentrate or the recovery rate of the zircon concentrate.

[0109] As can be seen by comparing example 1 and examples 2-5, the parameters of each step in the recovery process also affect the grade of the zircon concentrate and the recovery rate of the zircon concentrate, and by using appropriate parameters, the grade of the zircon concentrate and the recovery rate of the zircon concentrate can be further improved. In example 1, the grade of the zircon concentrate can reach 66.41% in terms of ZrO2, and the recovery rate of the zircon concentrate can reach 90.53% in terms of ZrO2.

[0110] Although the present application has been illustrated and described with reference to specific embodiments, it should be recognized that the above embodiments are merely illustrative of the technical solutions of the present application, and are not limiting thereof; it should be understood by those of ordinary skill in the art that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features thereof can be replaced equivalently, without departing from the spirit and scope of the present application; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application; therefore, this means that all such replacements and modifications within the scope of the present application are included in the appended claims.

Claims

1. A method for recovering electrically fused zirconia cyclone dust, characterized by, The method comprises the following steps: (a) mixing the electrically fused zirconia cyclone dust with water to form a slurry, and then performing gravity roughing separation to obtain a gravity roughing concentrate and a gravity roughing tailing; performing gravity scavenging separation on the gravity roughing tailing to obtain a gravity scavenging concentrate; mixing the gravity scavenging concentrate and the gravity roughing concentrate, and performing screening separation to obtain a screening oversize and a screening undersize; (b) performing gravity cleaning separation on the screening oversize to obtain a gravity cleaning concentrate and a gravity cleaning tailing; (c) mixing the screening undersize with a collector solution and a frother, and performing reverse flotation roughing separation to obtain a reverse flotation roughing concentrate and a reverse flotation roughing tailing; mixing the reverse flotation roughing concentrate and the gravity cleaning concentrate obtained in step (b), and performing solid-liquid separation to obtain a zircon concentrate; wherein the electrically fused zirconia cyclone dust is dust generated in the production of electrically fused zirconia, and main components of the electrically fused zirconia cyclone dust include zirconium silicate, zirconium dioxide and silicon dioxide.

2. The method for recovering the electrically fused zirconia oxide spinel according to claim 1, characterized by, The gravity cleaning tailing obtained in step (b) is recovered and gravity scavenging separation is performed again.

3. The method of claim 1, wherein the method is characterized by: The reverse flotation roughing tailing obtained in step (c) is recovered and reverse flotation scavenging separation is performed to obtain a reverse flotation scavenging concentrate; the reverse flotation scavenging concentrate is recovered and reverse flotation roughing separation is performed again.

4. The method of claim 1, wherein the method is characterized by: In step (a), at least one of the following features (1) to (3) is included: (1) the mass fraction of the electrically fused zirconia cyclone dust in the slurry is 25% to 40%; (2) the stroke of the gravity roughing separation is 15 to 25 mm, and the frequency is 200 to 300 times per minute; (3) the stroke of the gravity scavenging separation is 10 to 20 mm, and the frequency is 250 to 350 times per minute.

5. The method of claim 1, wherein the method further comprises: In step (a), the mesh number of the screen used for the screening separation is 120 to 200.

6. The method of claim 1, wherein the method further comprises: In step (b), the stroke of the gravity cleaning separation is 20 to 30 mm, and the frequency is 150 to 250 times per minute.

7. The method of claim 1, wherein the method further comprises: In step (c), at least one of the following features (1) to (5) is included: (1) the screening undersize is mixed with water to obtain a slurry with a mass fraction of 30% to 50%; (2) the collector solution includes at least one of dodecylamine polyoxyethylene ether solution, dodecylamine solution and dodecylpropyl ether amine solution; (3) the solvent in the collector solution includes acetic acid; (4) the mass fraction of the collector solution is 1% to 5%; (5) the addition amount of the collector solution is 300 to 600 g / t.

8. The method of claim 1, wherein the method further comprises: In step (c), the frother includes at least one of pinol oil and secondary octanol; and / or, the addition amount of the frother is 400 to 800 g / t.

9. The method of claim 1, wherein the method further comprises: In step (c), at least one of the following features (1) to (3) is included: (1) main components of the zircon concentrate include zirconium silicate and zirconium dioxide; (2) the grade of the zircon concentrate is ≥62% in terms of ZrO2; (3) the recovery rate of the zircon concentrate is ≥87% in terms of ZrO2.

10. Use of the zircon concentrate prepared by the method for recovering the electrically fused zirconia cyclone dust according to any one of claims 1 to 9 in the preparation of ceramics, medical materials, refractory materials, high-temperature resistant materials and electrolyte materials.

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