Method for preparing artware from salt lake magnesium and sodium wastes

Abstract

The invention provides a method for preparing artware by using salt lake magnesium and sodium wastes, which comprises the following steps: collecting magnesium and sodium-containing wastes generated in the development process of salt lake resources, the wastes comprising salt hexahydrate, sodium chloride and magnesium-containing minerals; preparing a first solution by adopting salt hexahydrate and sodium chloride, and preparing a second solution by adopting sodium chloride; mixing the first solution, the magnesium-containing mineral and quartz to form uniform slurry; and filling a mold with the slurry, then immersing the mold in a second solution, and at least standing under a set temperature condition, so that the slurry is cured in the mold to form a base body of the handicraft, and sodium chloride is deposited on the surface of the base body to form a sodium chloride crystal layer, thereby obtaining the handicraft. According to the method, magnesium and sodium wastes are used for preparing the attractive handicraft with a certain shape, the problems of low utilization rate and serious waste of salt lake resources are solved, and the obtained handicraft is relatively firm, does not easily absorb moisture and is beneficial to storage and later-stage continuous modification.

Description

Technical Field

[0001] The invention belongs to the technical field of salt lake resource utilization, and specifically relates to a method for preparing handicrafts by utilizing magnesium and sodium wastes in salt lakes. Background Art

[0002] Salt lake brine contains rich mineral resources. At present, potassium and lithium resources in salt lake brine are hot spots for utilization, while magnesium and sodium resources are not highly utilized. For example, magnesium resources are mainly used as raw materials for the preparation of potassium-magnesium fertilizers and metallic magnesium, while sodium resources are mainly used for the preparation of sodium chloride and related products. These traditional processes have low utilization rates for magnesium and sodium. For example, the byproduct hexahydrate Epsom salt (MgCl2﹒6H2O) is produced in the late stage of salt lake brine evaporation. This byproduct is produced after the magnesium-containing mother liquor produced in the potash fertilizer process evaporates; in the process of electrolyzing metallic magnesium using salt lake magnesium resources, the dehydration of MgCl2∙6H2O will produce magnesium-containing byproducts (mainly magnesium oxide); sodium chloride is produced in the process of brine evaporation and potash fertilizer section. These byproducts cannot usually be directly used as industrial raw materials in industrial production due to their large production volume, serious mother liquor carryover, and low grade. Therefore, they can only be piled up and discarded, resulting in serious waste of resources and not meeting the requirements of sustainable development. Summary of the invention

[0003] In order to solve all or part of the above technical problems, the present invention provides the following technical solutions: The present invention provides a method for preparing handicrafts by using salt lake magnesium and sodium wastes, comprising: Collecting magnesium- and sodium-containing wastes generated during the development of salt lake resources, including Epsom salt hexahydrate, sodium chloride, and magnesium-containing minerals; A first solution is prepared using Epsom salt hexahydrate and sodium chloride, and a second solution is prepared using sodium chloride; mixing the first solution, the magnesium-containing mineral and quartz to form a uniform slurry; The slurry is filled into a mold, and then the mold is immersed in the second solution and allowed to stand at least under a set temperature condition, so that the slurry is solidified in the mold to form a matrix of the handicraft, and sodium chloride is deposited on the surface of the matrix to form a sodium chloride crystal layer, thereby obtaining the handicraft.

[0004] The present invention utilizes the magnesium and sodium waste resources generated in the process of salt lake resource development to prepare beautiful handicrafts with a certain shape. The preparation process is simple and solves the resource waste problem caused by the accumulation and direct waste of magnesium and sodium waste resources in the current salt lake. In addition, mixing magnesium-containing minerals and quartz in the slurry can make the obtained handicrafts more solid, which is conducive to further modification and carving in the later stage; and it is not easy to absorb moisture and can be stored for a long time in a high humidity environment.

[0005] In some embodiments, the method specifically includes: immersing the mold in the second solution, and first standing at a temperature of 35-30°C for more than 2 hours, and then standing at a temperature of 10-20°C for more than 5 hours. Standing at a higher first temperature first to allow the sodium chloride solution to store heat and heat up is to allow the high-temperature sodium chloride solution to adhere to the mold. At the same time, the sodium chloride solution is easy to evaporate under high temperature conditions and crystallize on the mold wall. Then standing at a lower second temperature to allow sodium chloride crystals to precipitate, and the effect of temperature on the solubility of sodium chloride is used to cause the sodium chloride solution to precipitate during the cooling process.

[0006] In some embodiments, the standing time under the first temperature condition is 2 to 20 hours, and the standing time under the second temperature condition is 5 to 20 hours.

[0007] In some embodiments, the mass of the quartz is 10-20% of the total mass of the quartz and the magnesium-containing mineral.

[0008] In some embodiments, the ratio of the mass of the first solution to the total mass of the quartz and the magnesium-containing mineral is 1:1.5-1:2.

[0009] In some embodiments, the first solution has a MgCl2 content of 25.0-35.0 wt%, a NaCl content of 0.5-4.0 wt%, and a H2O content of 60.0-71.0 wt%.

[0010] In some embodiments, the second solution has a NaCl content of 25.0-32.0 wt %, and a H2O content of 68.0-75.0 wt %.

[0011] In some embodiments, the magnesium-containing mineral includes magnesium oxide.

[0012] In some embodiments, the source of the magnesium-containing mineral includes a byproduct produced by dehydration of MgCl2∙6H2O during the electrolytic production of metallic magnesium using salt lake magnesium resources. The byproduct generally contains 15.0-18.0 wt% magnesium oxide.

[0013] In some embodiments, the thickness of the sodium chloride crystal layer is 0.5-1.0 cm.

[0014] In some embodiments, the relative viscosity of the slurry is 5.30-6.80 mPa·s -1 .

[0015] The second object of the present invention is to provide a handicraft, which is obtained by the preparation method described in any of the above technical solutions. The interior of the handicraft is a solid formed by magnesium chloride, sodium chloride, magnesium-containing minerals, and quartz, and the surface layer is sodium chloride crystals of a certain thickness, which can be prepared into any shape, and the crystals on the outer layer show a certain aesthetic appearance.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention utilizes the magnesium and sodium waste resources generated in the process of salt lake resource development to prepare beautiful handicrafts with a certain appearance, and the preparation process is simple, which solves the current problem of resource waste caused by the accumulation and direct disposal of magnesium and sodium waste resources in salt lakes; the method provided by the present invention mixes magnesium-containing minerals and quartz in a slurry, and the prepared handicrafts are relatively strong and conducive to subsequent modification and carving; and are not easy to absorb moisture and can be preserved for a long time in a high humidity environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The present invention is a schematic diagram of a process for preparing a craft product using salt lake magnesium and sodium waste in one embodiment of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below in conjunction with specific embodiments so that those skilled in the art can better understand and implement the technical solution of the present invention. The specific functional details disclosed herein should not be interpreted as limiting, but only as the basis for the claims and as a representative basis for teaching those skilled in the art to adopt the present invention in different ways in any appropriate detailed embodiment.

[0020] The raw materials used for preparing the handicrafts of the present invention are derived from salt lake wastes, wherein the hexahydrate Epsom salt is produced in the evaporation process of salt lake brine and the potash fertilizer section; the magnesium-containing minerals are by-products produced in the dehydration process of MgCl2∙6H2O in the process of electrolyzing magnesium metal using salt lake magnesium resources, and the magnesium oxide content is 18.0wt%; and the sodium chloride is produced in the flotation tailings of the brine evaporation process and the potash fertilizer section.

[0021] Example 1 This embodiment provides a handicraft prepared using the above-mentioned salt lake waste and a preparation method thereof. Figure 1It is a flow chart of the method, which specifically includes the following steps: Solution C1 is prepared by using Epsom salt hexahydrate and sodium chloride, and solution C1 consists of 25.0 wt% MgCl2, 4.0 wt% NaCl, and 71.0 wt% H2O; solution C2 is prepared by using sodium chloride, and solution C2 consists of 25.0 wt% NaCl and 75.0 wt% H2O; Add a silicon-magnesium mixture R0 (the silicon-magnesium mixture is composed of 10wt% of quartz and 90wt% of magnesium-containing mineral) to the above solution C1, the mass ratio of solution C1 to magnesium-containing mineral R0 is 1:1.5, and mix the two thoroughly to form a viscous slurry R1; The slurry R1 is filled into an umbrella-shaped mold, and then the umbrella-shaped mold containing the slurry is placed in an evaporation tank, the evaporation tank contains solution C2, and the umbrella-shaped mold is immersed in solution C2. The mold is first allowed to stand at a temperature of 35°C for 2 hours, and then the temperature is adjusted to 10°C and continued to stand, so that the slurry is solidified in the mold to form a matrix of the handicraft, and a sodium chloride crystal layer grows on the surface of the matrix. When the thickness of the sodium chloride crystal layer reaches 0.5 cm (at this time, the standing time at 10°C is about 5 hours), the model is taken out of the evaporation tank and dried in the air to form the handicraft R2.

[0022] Example 2 This embodiment provides a handicraft prepared using the above-mentioned salt lake waste and a preparation method thereof, which specifically includes the following steps: Solution C1 is prepared by using Epsom salt hexahydrate and chlorination, and solution C1 consists of 35.0 wt% MgCl2, 0.5 wt% NaCl, and 60.0 wt% H2O; solution C2 is prepared by using sodium chloride, and solution C2 consists of 32.0 wt% NaCl and 68.0 wt% H2O; Add a silicon-magnesium mixture R0 (the silicon-magnesium mixture is composed of 20 wt% of quartz and 80 wt% of magnesium-containing mineral) to the above solution C1, the mass ratio of solution C1 to magnesium-containing mineral R0 is 1:2, and the two are fully mixed to form a viscous slurry R1; The slurry R1 is filled into the moon-shaped mold, and then the moon-shaped mold containing the slurry is placed in an evaporation tank, the evaporation tank contains solution C2, and the moon-shaped mold is immersed in solution C2. The evaporation tank is placed in a sun room, and the sun is exposed to heat by solar radiation (about 30°C) during the day, and then the night temperature (about 20°C) after cooling is used to precipitate sodium chloride crystals. The thickness of the sodium chloride crystals grown on the surface of the model reaches 1.0 cm, and it is taken out from the evaporation tank and dried in the air to form the handicraft R2.

[0023] Since salt lake resources are mainly located in the Qinghai-Tibet Plateau, magnesium and sodium wastes from salt lakes are accumulated in the Qinghai-Tibet Plateau and cannot be effectively utilized. The above method can be used to prepare these magnesium and sodium wastes into beautiful handicrafts with certain shapes. In addition, the method can utilize the temperature difference between day and night in the Qinghai-Tibet Plateau (usually reaching more than 15-20°C) to precipitate sodium chloride crystals without additional production energy consumption, which is in line with the regional development characteristics.

[0024] Example 3 This embodiment provides a handicraft prepared using the above-mentioned salt lake waste and a preparation method thereof, which specifically includes the following steps: Solution C1 is prepared by using Epsom salt hexahydrate and chlorination, and solution C1 consists of 30.0 wt% MgCl2, 3.5 wt% NaCl, and 66.5 wt% H2O; solution C2 is prepared by using sodium chloride, and solution C2 consists of 30 wt% NaCl and 70 wt% H2O; Add a silicon-magnesium mixture R0 (the silicon-magnesium mixture is composed of 15wt% of quartz and 85wt% of magnesium-containing mineral) to the above solution C1, the mass ratio of solution C1 to magnesium-containing mineral R0 is 1:1.9, and mix the two thoroughly to form a viscous slurry R1; The slurry R1 is filled into the hill-shaped mold, and then the hill-shaped mold containing the slurry is placed in an evaporation tank, the evaporation tank contains solution C2, and the hill-shaped mold is immersed in solution C2. The mold is first allowed to stand at 33°C for 3 hours, and then the temperature is adjusted to 15°C and allowed to stand continuously to allow sodium chloride crystals to precipitate, until the thickness of the sodium chloride crystals grown on the surface of the model reaches 0.8 cm (at this time, the standing time at 15°C is about 6 hours), and then taken out from the evaporation tank and dried in the air to form craft R2.

[0025] Comparative Example 1 Solution C1 is prepared by using Epsom salt hexahydrate and sodium chloride, and solution C1 consists of 25.0 wt% MgCl2, 4.0 wt% NaCl, and 71.0 wt% H2O; solution C2 is prepared by using sodium chloride, and solution C2 consists of 25.0 wt% NaCl and 75.0 wt% H2O; Add a silicon-magnesium mixture R0 (the silicon-magnesium mixture is composed of 10wt% of quartz and 90wt% of magnesium-containing mineral) to the above solution C1, the mass ratio of solution C1 to magnesium-containing mineral R0 is 1:1.5, and mix the two thoroughly to form a viscous slurry R1; The slurry R1 is filled into an umbrella-shaped mold, and then the umbrella-shaped mold containing the slurry is placed in an evaporation tank, the evaporation tank contains solution C2, and the umbrella-shaped mold is immersed in solution C2. The evaporation tank is placed in a temperature environment of 24°C until the thickness of the sodium chloride crystals grown on the surface of the model reaches 0.5 cm. The model is taken out of the evaporation tank and dried in the air to form a handicraft R2.

[0026] By comparing Example 1 and Comparative Example 1, it is found that in Comparative Example 1, the small model of sodium chloride crystal particles grown at a constant temperature is distorted, the number of sodium chloride crystals attached to the model is small, and the growth of the raw crystals is slow.

[0027] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that, instead of using quartz, Comparative Example 2 uses solution C1 mixed with a magnesium-containing mineral to form a slurry, and the rest is the same as Example 1.

[0028] By comparing Example 1 and Comparative Example 2, it is found that the hardness of the handicraft prepared in Comparative Example 2 is reduced, and it is easier to absorb moisture than the handicraft in Example 1, and cannot be stored for a long time in a high humidity environment.

[0029] The various aspects, embodiments, features and examples of the present invention should be considered as illustrative in all aspects and are not intended to limit the present invention, the scope of the present invention is defined only by the claims. Other embodiments, modifications and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0030] In addition, the inventors of this case also referred to the aforementioned embodiments and conducted experiments with other raw materials, process operations, and process conditions described in this specification, and obtained relatively ideal results.

[0031] Although the present invention has been described with reference to illustrative embodiments, it will be appreciated by those skilled in the art that various other changes, omissions and / or additions may be made without departing from the spirit and scope of the present invention and that the elements of the embodiments may be replaced by substantial equivalents. In addition, many modifications may be made without departing from the scope of the present invention to adapt specific circumstances or materials to the teachings of the present invention. Therefore, it is not intended herein to limit the present invention to the disclosed specific embodiments for performing the present invention, but it is intended that the present invention will include all embodiments within the scope of the appended claims. In addition, unless specifically stated, any use of the terms first, second, etc. does not indicate any order or importance, but rather uses the terms first, second, etc. to distinguish one element from another element.

Claims

1. A method for preparing handicrafts using salt lake magnesium and sodium wastes, It is characterized in that include: Collecting magnesium- and sodium-containing wastes generated during the development of salt lake resources, including Epsom salt hexahydrate, sodium chloride, and magnesium-containing minerals; A first solution is prepared using Epsom salt hexahydrate and sodium chloride, and a second solution is prepared using sodium chloride; mixing the first solution, the magnesium-containing mineral and quartz to form a uniform slurry; The slurry is filled into a mold, and then the mold is immersed in the second solution and allowed to stand at least under a set temperature condition, so that the slurry is solidified in the mold to form a matrix of the handicraft, and sodium chloride is deposited on the surface of the matrix to form a sodium chloride crystal layer, thereby obtaining the handicraft.

2. The method according to claim 1, It is characterized in that Specifically include: The mold is immersed in the second solution, and is first allowed to stand at a temperature of 35-30° C. for more than 2 h, and then allowed to stand at a temperature of 10-20° C. for more than 5 h.

3. The method according to claim 1, Features: The mass of the quartz is 10-20% of the total mass of the quartz and the magnesium-containing mineral.

4. The method according to claim 1, Features: The ratio of the mass of the first solution to the total mass of the quartz and the magnesium-containing mineral is 1:1.5 to 1:

2.

5. The method according to claim 1, Features: The first solution contains MgCl 2 The content is 25.0~35.0wt%, the NaCl content is 0.5~4.0 wt%, and the H 2 O content: 60.0~71.0 wt%.

6. The method according to claim 1, Features: The second solution contains 25.0-32.0 wt% NaCl and 25.0-32.0 wt% H 2 O content: 68.0~75.0 wt%.

7. The method according to claim 1, Features: The magnesium-containing mineral includes magnesium oxide.

8. The method according to claim 1 or 7, Features: The source of the magnesium-containing mineral includes MgCl 2 ∙6H 2 O is a byproduct of dehydration.

9. The method according to claim 1, Features: The thickness of the sodium chloride crystal layer is 0.5-1.0 cm.

10. A kind of handicraft, Features: It is obtained by the preparation method described in any one of claims 1 to 9.

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