Acidolysis tank

Abstract

The utility model relates to the field of magnesium chloride production, in particular to an acidolysis tank. The acidolysis tank comprises an acidolysis tank body (1), and a unit upper cover (7) is arranged above the acidolysis tank body (1); a hydrochloric acid injection opening (3), an ore powder feeding opening (5) and a gas escape collecting opening (4) are formed in the unit upper cover at the front end of the acidolysis tank body; the unit upper cover (7) also comprises an opening for mounting a stirrer; the stirrer can be used for stirring substances in the acidolysis tank; and an acidolysis tank liquid outlet filter screen (13) is arranged on the side of the liquid outlet (11).

Description

Technical Field

[0001] This utility model relates to the field of magnesium chloride production, and in particular to an acid hydrolysis tank. Background Technology

[0002] In inland regions, magnesium chloride (MgCl2) is produced from magnesium-rich ores using a low-cost and environmentally friendly method. This process not only provides an important raw material for electrolytic magnesium production but also has applications in defense, chemical, pharmaceutical, and metallurgical industries. Magnesium chloride is also widely used as a powerful desiccant / hygroscopic agent, moisture absorber, antioxidant, and a key ingredient in certain pharmaceuticals. In the field of metallic magnesium smelting, dolomite, using the thermal reduction method (commonly known as the Pidgeon process) and its improved forms, has accounted for over 99% of metallic magnesium consumption in recent years. However, this method requires high-temperature calcination and reduction, along with the use of large amounts of ferrosilicon. This results in high magnesium content in the reduction residue (i.e., magnesium slag, where the magnesium oxide content is generally higher than 10%), and these residues become "hazardous micro-waste." Furthermore, since the effective component of the ore is MgCO3, the Pidgeon process for metallic magnesium production is a high-energy-consuming, high-polluting, high-emission, and high-cost industry.

[0003] Meanwhile, using brine from salt lakes (or byproducts from carnallite and potash fertilizer production) as raw material to extract magnesium chloride for electrolytic magnesium production was originally a more "green" magnesium production route. However, electrolytic magnesium production requires high-quality anhydrous magnesium chloride as a raw material, and since its practical application in the 1960s, the process of producing anhydrous magnesium chloride has remained extremely difficult, with complex technical routes and high costs. The resulting metallic magnesium is not only expensive, but the multi-stage hydrated magnesium chloride (MgCl2·6H2O) dehydration technology developed by institutions such as Dow Chemical still faces significant challenges in large-scale production of anhydrous magnesium chloride: high cost, low efficiency, and poor production stability. Furthermore, the regions currently requiring magnesium production are inland, often far from salt lakes or the coast, making it inconvenient and commercially unviable to transport naturally crystallized hydrated magnesium chloride (MgCl2·6H2O, with a magnesium content of only 11.95% wt) inland. Dolomite, with its relatively low magnesium content, has an average magnesium content of 13.9% wt, while magnesite has an average magnesium content of 27.13% wt. Therefore, extracting magnesium chloride through ore conversion is particularly necessary.

[0004] On April 2, 2025, a search was conducted in the China Patent Publication Database using "ore and acid hydrolysis and magnesium chloride and hydrochloric acid and power generation" as the abstract keywords and with the option to allow synonym expansion. No relevant literature was found.

[0005] On April 2, 2025, an abstract search was conducted on CNKI (China National Knowledge Infrastructure) for the search term "ore and acidolysis and magnesium chloride and hydrochloric acid and power generation," but no relevant literature was found.

[0006] On April 2, 2025, a search was conducted on the website of the United States Patent and Trademark Office for the search term "ore with acid decomposition with magnesium chloride with hydrochloric acid with power generation", but no relevant literature was found; the search URL is https: / / ppubs.uspto.gov / pubwebapp / .

[0007] On April 2, 2025, a search was conducted on WIPO's website https: / / patentscope2.wipo.int / for the search term "ore and acid decomposition and magnesium chloride and hydrochloric acid and power generation", but no relevant literature was found.

[0008] On April 2, 2025, a search was conducted on the website of the Japan Patent Office (https: / / www.j-platpat.inpit.go.jp / ) for the search term "ore and acid decomposition and magnesium chloride and hydrochloric acid and power generation", but no relevant literature was found.

[0009] Reference patent 1: A system and method for extracting metallic magnesium from seawater desalination residue, CN201811030259;

[0010] Reference Patent 2: Magnesium Chloride Dryer, CN2023200778455

[0011] Note: The core technology of these two patents is the one-step preparation of anhydrous magnesium chloride;

[0012] The downstream technologies that belong to this patent are completely different from the concept and core utility model of this patent. Utility Model Content

[0013] The purpose of this utility model is to provide a more effective method and equipment for producing magnesium chloride from ore. Specific objectives are detailed in the specific implementation section, which outlines several substantial technical effects.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] Option 1: A method and equipment for producing magnesium chloride from ore; this is a comprehensive protection scheme.

[0016] Option 2: Acid hydrolysis tank; The core of this option is to protect the acid hydrolysis tank separately, as it is a product that can be sold and protected separately.

[0017] in:

[0018] Option 1 and Option 2 are closely related as a whole, forming a tightly integrated technical system, but each has its own focus.

[0019] To achieve the above objectives, the present invention adopts the following technical solution:

[0020] A method for producing magnesium chloride from ore, characterized in that the method involves acid hydrolysis of ore to produce magnesium chloride;

[0021] The main process includes the following steps:

[0022] In the ore powder processing industry, hydrochloric acid is passed through an acid hydrolysis tank under stirring to undergo a displacement reaction;

[0023] The obtained clear liquid was subjected to staged evaporation and concentration to obtain high-purity magnesium chloride crystals and calcium chloride + magnesium chloride mixed crystals. The calcium chloride-rich aqueous solution was then evaporated again to obtain magnesium chloride.

[0024] The ore in question is a high-magnesium mineral such as magnesite, dolomite, forsterite, or brucite.

[0025] Magnesium chloride production from magnesite: MgCO3 + 2HCl = MgCl2 + CO2↑ + H2O + ΔH1;

[0026] Magnesium chloride preparation from dolomite: MgCa(CO3)2+4HCl=MgCl2+CaCl2+2CO2↑+2H2O+ΔH2.

[0027] A further technical solution of this utility model is that the production of magnesium chloride by acid hydrolysis of ore also includes one or more of the following side reaction processes;

[0028] Sub-process 1: Thermoelectric conversion and output: Reaction heat ΔH --> Thermoelectric conversion unit --> Output cable system, output DC power;

[0029] Sub-process 2: Hydrogen chloride gas escapes + carbon dioxide gas escapes, hydrogen chloride is recovered by water counter-current spraying, or gaseous hydrogen chloride and solid CO2 are separated by freezing to obtain high-purity CO2, which is then collected, stored / sold / sealed underground.

[0030] Sub-process 3: A very small amount of acid-insoluble matter in the ore is pushed to the end of the acid hydrolysis tank by the agitator, discharged by the slag discharger, and then rinsed for further utilization;

[0031] Sub-process 4: If the ore contains a small amount of Fe2O3, adjust the pH of the liquid in the external liquid pool at the outlet to 2-4.5, according to Fe... +3 To determine the content, add hydrogen peroxide at a molar ratio of 1:1, filter out the precipitated Fe(OH)3, and then carry out concentration and drying operations.

[0032] Sub-process 5: Recovery of reaction heat ΔH1 (ΔH2): thermoelectric conversion to achieve thermoelectric power generation.

[0033] A further technical solution of this utility model is as follows: The process is described continuously: Selected and cleaned magnesium-containing ores, such as magnesite, dolomite, forsterite, and brucite, are crushed and ground to a fineness of less than 200 mesh. They are then transported in a fully enclosed manner to the feed inlet at the front of the acid leaching tank according to the specified flow rate (kg / H), and continuously poured into the acid leaching tank through the channel on the unit's top cover. Simultaneously, industrial hydrochloric acid with a concentration of 30–36% wt is...

[0034] The ore powder is injected into the acid leaching tank via specialized pipelines and valves in a completely enclosed manner according to the ore powder flow rate. The gas outlet of the acid leaching tank is connected to a water washing chamber, where a small amount of HCl gas in the CO2 is washed away by water spraying. After drying in a drying chamber, the gas enters the collection stage. Alternatively, CO2 can be converted into a solid by freezing, and HCl gas can be separated. Spray water is used at the liquid outlet to quickly wash the crystallized MgCl2 crystals. After neutralization, the crystals enter a new cycle, where a small amount of HCl gas in the CO2 is absorbed by spraying. During the circulation process, the Cl2 content is automatically detected. -The calcium chloride content, once reaching a specific concentration, enters a concentration and crystallization cycle, collecting MgCl2, MgCl2+CaCl2 mixed salt (in this case, dolomite is used as raw material), rich in calcium chloride mixed salt, and aqueous solution; the ore powder + hydrochloric acid slurry in the acidolysis tank is continuously stirred and pushed to the end of the acidolysis tank by a mixer for about 3-10 hours, during which the ore powder in the slurry continuously dissolves, and the generated MgCl2+CaCl2 aqueous solution enters the iron removal sedimentation tank 91 through the outlet filter screen (i.e., the primary filter screen). The solution is continuously discharged to the high-temperature constant-temperature evaporator (i.e., the primary evaporator) through the secondary filter screen, collecting the primary crystals, i.e., high-purity MgCl2. Here, the high-purity MgCl2 is magnesium chloride hexahydrate MgCl2·6H2O with crystal water. The MgCl2 concentration is continuously monitored during the evaporation process, and when it reaches a specified value... The solution is introduced into a cooling evaporator (secondary evaporator) after passing through a three-stage filter. The solution temperature is lowered to 20-30℃ via external cooling. It then passes through a four-stage filter before being introduced into a low-temperature constant-temperature evaporator (tertiary evaporator). During the cooling process, crystals precipitated in the secondary evaporator are collected after rapid spray washing; these are magnesium chloride and calcium chloride mixed salts, i.e., MgCl2 + CaCl2. After thorough evaporation in the tertiary evaporator, the solution passes through four filters to collect the third set of CaCl2-rich crystals. The residual liquid, containing CaCl2 + MgCl2, is pumped back to the outlet via a return pipe, valve, and pump, where it mixes with newly produced clear liquid and re-enters the evaporation cycle. The insoluble solid residue in the acidolysis tank, mainly composed of SiO2, is removed by a slag remover, dried, collected, and reused, such as for silicon smelting.

[0035] For Fe +3 For ores with higher iron content, after acid leaching, the solution is introduced into an iron removal sedimentation tank, upstream of the primary evaporator, by dripping, based on the detected Fe content. +3 The content is determined by adding a certain amount of industrial hydrogen peroxide, letting it stand for several minutes or slowly filtering it through a secondary filter before introducing it into a primary evaporator. The solid precipitate, ferric hydroxide (Fe(OH)3), is collected and reused through a collector.

[0036] The thermoelectric conversion unit installed on the outer wall of the inner liner of the acid hydrolysis tank can convert 3.5% to 20% of the heat released by the acid hydrolysis of the ore into direct current, which is then output through a cable system to generate economic value as a by-product.

[0037] The inner side of the acid hydrolysis tank's outer liner is connected to the hot side of the thermoelectric generator system via a high thermal conductivity adhesive, while the inner surface of the acid hydrolysis tank's outer liner is in contact with the cold side of the thermoelectric generator system via the same adhesive. The outer side of the acid hydrolysis tank's outer liner is in contact with the cooling water in the cooling jacket. The cooling water is circulated; after absorbing heat, it is discharged from the hot water outlet for use in the hot water supply system for the work area or living area. After the heat is released and the temperature drops to near room temperature, it re-enters the cooling water circulation. Further cooling can be achieved using a dedicated cooling tower or cooling water tank. Cold water is introduced into the cooling chamber from the inlet. The bottom of the acid hydrolysis tank's outer liner and the cooling water jacket are supported by a stainless steel or titanium alloy frame structure.

[0038] A further technical solution of this utility model is that: the equipment for producing magnesium chloride by ore method includes an acid hydrolysis tank arranged in a dedicated space;

[0039] The dedicated space includes a cement-filled outer wall 75 arranged in a rammed earth trench. The inner wall of the cement-filled outer wall 75 is in contact with the outer wall of the cooling water jacket made of corrosion-resistant metal. The cooling water jacket is provided with an acid hydrolysis tank water cooling jacket support network structure 77, which is composed of multiple sets of hollow support plates. The holes of the multiple sets of hollow support plates are interconnected.

[0040] A cooling water inlet 79 is arranged below one side of the liquid outlet end of the acid hydrolysis tank water cooling jacket, and a hot water outlet 61 is arranged above the other side of the feed inlet end of the acid hydrolysis tank water cooling jacket.

[0041] The acid hydrolysis tank water cooling jacket support network structure 77 includes a space for accommodating the acid hydrolysis tank outer liner 78; the inner wall of the acid hydrolysis tank outer liner 78 is arranged with a thermoelectric generator assembly 50.

[0042] The inner surface of the thermoelectric generator assembly 50 is provided with a titanium alloy / stainless steel acid hydrolysis tank inner liner 58, and the thermoelectric conversion unit is connected to the outer wall of the acid hydrolysis tank inner liner by a high thermal conductivity adhesive.

[0043] The inner wall surface of the outer tank 78 of the surface acid digester is connected to the cold surface of the thermoelectric conversion unit through a high thermal conductivity adhesive layer 74;

[0044] The outer liner 78 of the acid hydrolysis tank is fastened to the upper end face of the cement-filled outer wall 75 by the upper side fastening plate 59 of the acid hydrolysis tank and the fastening plate connecting bolts 64 thereon. Multiple observation and testing windows 63 are arranged on the side fastening plate 59 of the acid hydrolysis tank.

[0045] The thermoelectric conversion unit 72 is connected to a thermoelectric output cable through hole 69, and the thermoelectric output cable through hole 69 extends out of the outer tank 78 of the acid hydrolysis tank.

[0046] The acid lysis tank includes an acid lysis tank body 1, and a unit cover 7 is arranged on the top of the acid lysis tank body 1; the unit cover at the front end of the acid lysis tank body is provided with a hydrochloric acid injection port 3, an ore powder feeding port 5, and a gas escape collection port 4.

[0047] The unit cover 7 also includes an opening for installing a mixer; the mixer is capable of stirring the substances inside the acid hydrolysis tank.

[0048] A primary filter screen 13, i.e., an acid hydrolysis tank outlet filter screen, is arranged on the side of the outlet 11.

[0049] A further technical solution of this utility model is that: the mixer includes a mixer mounting base 6, and the mixer mounting base 6 can be installed on the mixer mounting hole 19 on the unit cover 7 through the mixer end cover mounting bolt hole 22 to form a mixer array;

[0050] The mixer mounting base 6 is provided with a mixer column tube diagonal brace 24 and a mixer column tube 25 at the lower part; the mixer column tube 25 is hollow and has a rotating shaft in it, and a mixer drive system motor 23 is arranged on its upper part. The mixer drive system motor 23 is powered by a bevel gear and the rotating shaft is powered by a mixer impeller driven by the bevel gear shaft at the bottom of the rotating shaft.

[0051] A further technical solution of this utility model is as follows: the slag discharger includes a slag discharger mounting cover 9, which is fixed to the slag discharger mounting hole on the unit cover 7 by mounting bolts. A double diagonal brace 35 for the slag discharger column pipe is provided below the slag discharger mounting cover 9. A slag discharger drive system motor 31 is arranged on the upper part of the slag discharger mounting cover 9. The slag discharger drive system motor 31 drives the chain to drive the slag discharger bucket to rise and fall. The cover is flipped and the bucket is rotated through the positioning mechanism, which can send the solid residue out of the acid hydrolysis tank.

[0052] A further technical solution of this utility model is that: the slag discharge machine mounting cover 9 is provided with a slag discharge port flip cover 32 and a slag discharge port flip cover hinge 33, and the slag discharge machine mounting cover 9 can be flipped down to cover the slag discharge machine hopper lifting port 34.

[0053] A further technical solution of this utility model is that: the thermoelectric generator assembly 50 of the thermoelectric generator assembly includes thermoelectric elements, cables, and a transformer system, which can convert the heat of acid hydrolysis reaction into direct current output.

[0054] A further technical solution of this utility model is as follows: the outlet 11 of the acid hydrolysis tank is connected to the iron removal sedimentation tank 91, the iron removal sedimentation tank 91 is connected to the high-temperature evaporation crystallizer 93 after passing through the secondary filter screen 92, the high-temperature evaporation crystallizer 93 is connected to the cooling crystallizer 96 after passing through the tertiary filter screen 95, the cooling crystallizer 96 is connected to the low-temperature evaporation crystallizer 98 after passing through the quaternary filter screen 97, the low-temperature evaporation crystallizer 98 is connected to the return liquid pipeline-valve-pump 94 and then connected to the high-temperature evaporation crystallizer 93; a fifth-stage filter screen 99 is arranged at the inlet of the return liquid pipeline-valve-pump 94;

[0055] A ferric hydroxide collector 103 is arranged below the iron removal sedimentation tank 91;

[0056] A magnesium chloride high-temperature crystallization collector 102 is arranged below the high-temperature evaporator crystallizer 93;

[0057] Below the cooling crystallizer 96, there is a cooling crystallizer collector 101 consisting of a mixture of magnesium chloride and calcium chloride.

[0058] A low-temperature crystallizer 100 rich in calcium chloride is arranged below the low-temperature evaporation crystallizer 98.

[0059] A further technical solution of this utility model is that: the thermoelectric conversion unit is a Seebeck effect thermoelectric conversion system; the iron hydroxide precipitation tank collector 103, the magnesium chloride high-temperature crystallization collector 102, the magnesium chloride + calcium chloride mixed cooling crystallization collector 101, and the low-temperature crystallization collector 100 are all moisture-proof special facilities with prominent markings.

[0060] The further technical solution of this utility model is as follows: the inner liner is made of titanium alloy or nickel-based alloy resistant to chloride ion corrosion; the outer liner is made of steel, stainless steel or titanium alloy resistant to hot water corrosion; the outer liner is a segmented composite shell, each segment can be individually peeled off from the overall tank for maintenance of the thermoelectric conversion system; the feeding system consists of a powder feeding system and an acid injection system; the ore powder feeding is carried out by a commercial-grade closed conveyor belt; the hydrochloric acid injection system consists of a commercial-grade acid-resistant pump, pipes, and valves; the column pipe, connecting fan blades and drive shaft of the mixer are made of titanium alloy, nickel-based alloy or austenitic stainless steel resistant to chloride ion corrosion; the slag discharger bucket, column pipe and reversing mechanism are made of corrosion-resistant titanium alloy, nickel-based alloy or austenitic stainless steel;

[0061] The rear end of the acid hydrolysis tank is composed of a head end plate and a tail end plate; the tail end plate is equipped with a liquid outlet with a filter screen and upper and lower baffles of the liquid outlet, all of which are made of corrosion-resistant titanium alloy or stainless steel; the tank body, front end plate, upper and lower baffles of the end, liquid outlet and liquid outlet filter screen of the acid hydrolysis tank are all connected by welding.

[0062] The water-cooled jacket is a trough-type structure made of corrosion-resistant steel or stainless steel. It is connected to the outer liner of the acid-cooling tank through a water-cooled jacket support network made of corrosion-resistant steel or stainless steel. The water-cooled jacket support network is achieved by welding, plugging or gluing.

[0063] The water-cooled jacket is embedded in a cement-filled foundation pit, which is buried in rammed earth. A cold water inlet and inlet pipe are provided on the lower part of one side of the water-cooled jacket, leading to a water source or cooling tower / cooling water pool. A hot water outlet is provided at the upper front part of the other side of the water-cooled jacket, leading to a hot water supply network or cooling tower / cooling water pool.

[0064] The thermoelectric conversion layer consists of thermoelectric generators and a cable network. The hot side of the thermoelectric generator contacts the outer surface of the acid hydrolysis tank liner through a high thermal conductivity adhesive, while the cold side contacts the inner surface of the acid hydrolysis tank liner through the same adhesive. Based on the size of the acid hydrolysis tank, the acid hydrolysis reaction rate, and the thermoelectric efficiency of the thermoelectric generators, the thermoelectric conversion units are grouped and wired together. They are connected in parallel within a group and in series between groups, or in series within a group and in parallel between groups, to form an output cable network. The thermoelectric output is achieved through a transformer and used for self-use, transmission to a local power grid, or transmission to designated users or energy storage systems, generating additional economic income.

[0065] Option 2:

[0066] The acid hydrolysis tank is characterized in that it includes an acid hydrolysis tank body 1, and a unit cover 7 is arranged on the top of the acid hydrolysis tank body 1; the unit cover at the front end of the acid hydrolysis tank body is provided with a hydrochloric acid injection port 3, an ore powder feeding port 5, and a gas escape collection port 4.

[0067] The unit cover 7 also includes an opening for installing a mixer; the mixer is capable of stirring the substances inside the acid hydrolysis tank.

[0068] A filter screen 13 for the acid hydrolysis tank outlet is arranged on the side of the outlet 11.

[0069] A further technical solution of this utility model is that a slag discharge machine is provided on the unit cover on the side near the liquid outlet 11; the slag discharge machine can remove the insoluble solid residue that has settled at the bottom of the tank.

[0070] A further technical solution of this utility model is that: the acid hydrolysis tank includes an acid hydrolysis tank outer liner 78; a thermoelectric conversion unit is arranged on the inner surface of the acid hydrolysis tank outer liner 78.

[0071] The hot surface of the thermoelectric conversion unit is in contact with the inner surface of the titanium alloy / stainless steel inner liner 58 of the acid hydrolysis tank through a highly thermally conductive adhesive.

[0072] The thermoelectric conversion unit 72 is connected to a thermoelectric output cable through hole 69, which passes through the outer tank 78 of the acid hydrolysis tank and outputs DC power.

[0073] A further technical solution of this utility model is that: the mixer includes a mixer mounting base 6, and the mixer mounting base 6 can be installed on the mixer mounting hole 19 on the unit cover 7 through the mixer end cover mounting bolt hole 22 to form a mixer array;

[0074] The mixer mounting base 6 is provided with a mixer column tube diagonal brace 24 and a mixer column tube 25 at the lower part; the mixer column tube 25 is hollow and has a rotating shaft in it, and a mixer drive system motor 23 is arranged on its upper part. The mixer drive system motor 23 is powered by a bevel gear and the rotating shaft is powered by a mixer impeller driven by the bevel gear shaft at the bottom of the rotating shaft.

[0075] A further technical solution of this utility model is as follows: the slag discharger includes a slag discharger mounting cover 9, which is fixed to the slag discharger mounting hole on the unit cover 7 by mounting bolts. A double diagonal brace 35 for the slag discharger column pipe is provided below the slag discharger mounting cover 9. A slag discharger drive system motor 31 is arranged on the upper part of the slag discharger mounting cover 9. The slag discharger drive system motor 31 drives the chain to drive the slag discharger bucket to rise and fall. The cover is flipped and the bucket is rotated through the positioning mechanism, which can send the solid residue out of the acid hydrolysis tank.

[0076] A further technical solution of this utility model is that: the slag discharge machine mounting cover 9 is provided with a slag discharge port flip cover 32 and a slag discharge port flip cover hinge 33, and the slag discharge machine mounting cover 9 can be flipped down to cover the slag discharge machine hopper lifting port 34.

[0077] A further technical solution of this utility model is that the slag discharge machine is a tipping bucket elevator.

[0078] The present invention, which adopts the above technical solution, has the following beneficial effects compared with the prior art: there is no need to transport magnesium chloride from coastal or salt lake areas to inland areas. Magnesium chloride can be produced from ore in large quantities, with high efficiency and low cost, simply through the device and technical path of the present invention. Attached Figure Description

[0079] To further illustrate this utility model, the following description is provided in conjunction with the accompanying drawings:

[0080] Figure 1 Schematic diagram of the acid hydrolysis tank system;

[0081] Figure 2 Schematic diagram of the upper unit cover of the acid hydrolysis tank (with agitator mounting holes);

[0082] Figure 3 Schematic diagram of a mixer;

[0083] Figure 4 Schematic diagram of the slag discharge machine;

[0084] Figure 5 Schematic diagram of the end of the acid hydrolysis tank and the outlet;

[0085] Figure 6 Schematic diagram of the cross-section of the acid hydrolysis tank;

[0086] Figure 7 A schematic diagram of the cross-section of the acid hydrolysis tank installation;

[0087] Figure 8 Schematic diagram of the entire process for producing magnesium chloride from acid hydrolysis ore

[0088] The components include: 1. Acid hydrolysis tank body; 2. Left end face of the tank body; 3. Hydrochloric acid injection port; 4. Gas escape collection port; 5. Ore powder feeding port; 6. Agitator mounting base; 7. Unit top cover; 8. Slag discharger drive mechanism; 9. Slag discharger mounting cover; 10. Upper sealing baffle at the end of the acid hydrolysis tank; 11. Liquid outlet; 12. Lower sealing baffle at the end of the acid hydrolysis tank; 13. Filter screen at the liquid outlet of the acid hydrolysis tank; 14. Slag discharger bucket and reversing mechanism; 15. Thermoelectric conversion system and water cooling jacket support; 16. Agitator fan blades;

[0089] 18. Unit top cover mounting bolt holes; 19. Mixer mounting hole; 20. Mixer mounting bolt holes; 22. Mixer end cover mounting bolt holes; 23. Mixer drive system motor; 24. Mixer column tube diagonal brace; 25. Mixer column tube; 26. Mixer bevel gear and longitudinal drive shaft; 27. Mixer impeller; 30. Slag discharger mounting cover mounting bolt holes; 31. Slag discharger drive system motor; 32. Slag discharge port flip cover; 33. Slag discharge port flip cover hinge; 34. Slag discharger hopper lifting port; 35. Slag discharger column tube double diagonal brace; 36. Slag discharger column tube; 37. Slag discharger lifting slide bar; 38. Lower positioning connector - slide bar groove; 39. Slag discharger flip plate mechanism; 40. Slag discharger bucket; 44. Liquid outlet guide groove; 47. Thermoelectric output terminal wiring port; 48. Thermoelectric output terminal positive and negative wiring terminals and transformer; 49. 50. Horizontal lead wire (positive red, negative black); 51. Thermoelectric generator assembly; 52. Vertical lead wire (positive red, negative black); 53. Vertical thermoelectric conversion unit lead wire (positive / negative terminal); 54. Vertical thermoelectric conversion unit lead wire (negative / positive terminal); 55. Unit top cover mounting bolts; 56. Acid hydrolysis tank titanium alloy / stainless steel inner liner; 57. Acid hydrolysis tank side panel; 68. Hot water outlet; 69. Observation and testing window; 60. Panel connecting bolts; 61. Side gap; 62. Thermoelectric output cable through hole; 73. Thermoelectric upper cable; 74. Thermal inert filler strip; 75. Thermoelectric conversion unit; 76. Thermoelectric conversion unit hot surface high thermal conductivity adhesive layer; 77. Thermoelectric conversion unit cold surface high thermal conductivity adhesive layer; 78. Cement-filled outer wall; 79. Water-cooled jacket outer shell; 70. Acid hydrolysis tank water-cooled jacket support network structure; 71. Acid hydrolysis tank outer liner; 72. Cooling water inlet;

[0090] 91. Iron removal sedimentation tank; 92. Secondary filter screen; 93. High-temperature evaporator crystallizer; 94. Return liquid pipeline-valve-pump; 95. Tertiary filter screen; 96. Cooling crystallizer; 97. Quaternary filter screen; 98. Low-temperature evaporator crystallizer;

[0091] 99. Five-stage filter screen; 100. Low-temperature crystallization collector; 101. Cooling crystallization collector of magnesium chloride and calcium chloride mixture; 102. High-temperature crystallization collector of magnesium chloride; 103. Ferric hydroxide precipitation tank collector. Detailed Implementation

[0092] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that the term "magnesium chloride" unless otherwise emphasized refers to magnesium chloride hexahydrate (MgCl2·6H2O, also known as magnesium chloride hydrate), which is a different substance from "anhydrous magnesium chloride (MgCl2)". Hydrated magnesium chloride (which is further divided into monohydrate, dihydrate, tetrahydrate, hexahydrate, dodecahydrate, etc., containing different numbers of water molecules) only becomes anhydrous magnesium chloride after dehydration or drying to remove all water of crystallization. Other terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0093] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0094] This patent provides multiple parallel solutions; the different descriptions represent improved or parallel solutions based on a basic solution. Each solution has its own unique characteristics. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. Fixing methods not described herein can be any type of fixing, such as threaded fixing, bolt fixing, or adhesive bonding.

[0095] Example 1: Referring to all the accompanying drawings; a method for producing magnesium chloride from ore, characterized in that the method involves acid hydrolysis of ore to produce magnesium chloride;

[0096] The main process includes the following steps:

[0097] The ore powder is heated and then passed through an acid hydrolysis tank with industrial hydrochloric acid for acid hydrolysis under stirring, resulting in a displacement reaction.

[0098] The obtained magnesium chloride or calcium chloride + magnesium chloride aqueous solution is evaporated, concentrated and dried in stages;

[0099] To obtain magnesium chloride;

[0100] The ore in question is either magnesite or dolomite;

[0101] Magnesium chloride production from magnesite: MgCO3 + 2HCl = MgCl2 + CO2↑ + H2O + ΔH1;

[0102] Magnesium chloride production from dolomite: MgCa(CO3)2 + 4HCl = MgCl2 + CaCl2 + 2CO2↑ + 2H2O + ΔH 2。

[0103] The substantive technical effects and implementation process of the technical solution presented herein, i.e., its basic functions, are as follows: Almost every province in the inland region has abundant reserves of dolomite, magnesite, forsterite, or brucite. Generally, dolomite (MgCO3·CaCO3) contains about 13% magnesium, and magnesite contains about 24% magnesium. Therefore, designing and developing the extraction of magnesium chloride from ore is of great strategic significance to the inland electrolytic magnesium industry and other magnesium chloride users. In particular, it can upgrade the high-energy-consuming, high-polluting, high-emission, and high-cost Pidgeon process metallic magnesium on-site into electrolytic green metallic magnesium, which will generate significant economic and social value.

[0104] Since acid hydrolysis of ores is an exothermic reaction, a large amount of acid hydrolysis releases a significant amount of heat. There is no engineering precedent for how to recover and utilize this heat. Simply relying on water or air cooling would be a huge waste. However, by incorporating a heat-to-electricity conversion mechanism into the cooling system to maximize heat-to-electricity conversion for use in the production line's drive system, higher overall efficiency and lower costs can be achieved.

[0105] Main process: Ore powder + industrial hydrochloric acid ---> acid hydrolysis tank, stirring, displacement reaction:

[0106] The obtained magnesium chloride (magnesia magnesite as raw material) or calcium chloride + magnesium chloride (dolomite as raw material) aqueous solution is evaporated and concentrated in stages according to the temperature range ---> dried (Special technology: Patent: A system and extraction method for extracting metallic magnesium from seawater desalination residue CN201811030259) ---> magnesium chloride, magnesium chloride-rich mixed salt and calcium chloride-rich mixed salt (anhydrous magnesium chloride, anhydrous calcium chloride).

[0107] This device extracts and separates magnesium chloride from high-magnesium ores such as dolomite, magnesite, forsterite, and brucite, and generates electricity from the resulting product. The ore is sorted, washed, crushed, and ground into fine powder. This powder is then reacted with industrial hydrochloric acid in an acidolysis tank. The resulting clear liquid is leached out and subjected to staged evaporation and fractional crystallization to collect calcium chloride, a magnesium chloride + calcium chloride mixed salt, and a magnesium chloride + calcium chloride mixed solution, respectively. The magnesium chloride solution is dehydrated in one step to obtain anhydrous magnesium chloride. The magnesium chloride + calcium chloride mixed salt is then returned to the leached clear liquid, repeating the above fractional crystallization process to continuously produce high-purity magnesium chloride. Furthermore, a Seebeck-based thermoelectric conversion system is used to recover the large amount of heat released during the acidolysis process and use it to power the acidolysis tank system, maximizing overall efficiency.

[0108] Example 2: As a further improvement, parallel, or optional independent solution, the production of magnesium chloride by ore acid hydrolysis also includes one or more of the following side reaction processes;

[0109] Sub-process 1: Thermoelectric conversion and output: Reaction heat ΔH --> Thermoelectric unit --> Output cable system, output DC power;

[0110] Sub-process 2: Hydrogen chloride gas escapes + carbon dioxide gas escapes, hydrogen chloride is recovered by water counter-current spraying, or gaseous hydrogen chloride and solid CO2 are separated by freezing to obtain high-purity CO2, which is then collected, stored / sold / sealed underground.

[0111] Sub-process 3: A very small amount of acid-insoluble matter in the ore is pushed to the end of the acid hydrolysis tank by the agitator, discharged by the slag discharger, and then rinsed for further utilization;

[0112] Sub-process 4: If the ore contains a small amount of Fe2O3, adjust the pH of the liquid in the external liquid pool at the outlet to 2-4.5, according to Fe... +3 To determine the content, add hydrogen peroxide at a molar ratio of 1:1, filter out the precipitated Fe(OH)3, and then carry out concentration and drying operations.

[0113] Sub-process 5: Recovery of reaction heat ΔH1 (ΔH2): Thermoelectric conversion to achieve thermoelectric power generation. The substantive technical effects and implementation process of the technical solution here, i.e., its basic functions, are as follows: This solution not only provides a completely new path, but also provides an entire multi-system chemical engineering system, realizing comprehensive material utilization and chemical processes.

[0114] Example 3: As a further improvement, parallel, or optional independent solution, the process is described continuously as follows: Selected and cleaned magnesium-bearing ores, including magnesite, dolomite, forsterite, and brucite, are crushed and ground to a fineness of less than 200 mesh. They are then continuously poured into the acid leaching tank via a closed-loop conveyor at a flow rate of kg / H, as per the acid leaching tank specifications. Simultaneously, industrial hydrochloric acid with a concentration of 30–36% wt is added...

[0115] According to the ore powder flow rate ratio, the ore is injected into the acid leaching tank in a completely closed system through specialized pipelines and valves. The gas outlet of the acid leaching tank is connected to a water washing chamber, where a small amount of HCl gas in the CO2 is washed away by water spraying. After drying in a drying chamber, the gas enters the collection stage. Spray water is used at the liquid outlet to quickly wash the precipitated MgCl2 crystals. Finally, after neutralization, the MgCl2 crystals enter a new cycle, where a small amount of HCl gas in the CO2 is absorbed by spraying. During the cycle, the Cl2 content is automatically detected. - Once the concentration reaches a specific level, the solution is introduced into the acidolysis tank to participate in the acidolysis process. The ore powder + hydrochloric acid slurry in the acidolysis tank is continuously propelled to the bottom of the tank by a mixer for approximately 3-10 hours. During this process, the ore powder in the slurry continuously dissolves, and the resulting MgCl2 or MgCl2 and CaCl2 aqueous solution enters the iron removal sedimentation tank (91) through the outlet filter (primary filter). The solution is then continuously discharged to the high-temperature constant-temperature evaporator through the secondary filter, collecting the high-purity MgCl2 from the primary evaporator crystallizer. The MgCl2 concentration is continuously monitored during the evaporation process, and when a specified value is reached, the solution is introduced into the cooling evaporator through the tertiary filter. When the temperature drops to 20-30℃, the solution then passes through the fourth stage filter. The filter screen is introduced into a low-temperature constant-temperature evaporator, i.e., a three-stage evaporator. The filtered crystals are collected after rapid spray washing, which is a mixed salt of MgCl2 + CaCl2. After thorough evaporation in the low-temperature evaporator, i.e., the three-stage evaporator, the third crystallization, a mixed salt rich in CaCl2, is collected through a four-stage filter screen. The residual liquid is returned to the outlet via a return pipe, valve, and pump, where it is mixed with the newly generated clear liquid and re-enters the evaporation cycle. Insoluble matter and undissolved residue in the acid hydrolysis tank are scooped out by a slag remover, dried, collected, and reused for silicon smelting. The insoluble residue is mainly SiO2.

[0116] For Fe +3For high-grade ore, after acidolysis, the solution is introduced into an iron removal sedimentation tank. A fixed amount of industrial hydrogen peroxide is added to the tank by dripping. After standing for several minutes or slowly passing through a secondary filter, the solution is introduced into a high-temperature evaporation crystallizer, i.e., a primary evaporator. The solid precipitate, ferric hydroxide, is collected by a collector.

[0117] The thermoelectric conversion system installed on the outer wall of the acidolysis tank can convert 3.5% to 20% of the heat released from the acidolysis of ore into direct current, which is then output through a cable system to generate economic value as a by-product.

[0118] The inner side of the acid hydrolysis tank's outer liner is connected to the thermoelectric conversion system via a high thermal conductivity adhesive. The inner surface of the outer liner is in contact with the cold surface of the thermoelectric conversion unit via the same adhesive. The outer side of the outer liner is placed in cooling water. The cooling water is circulated. After absorbing heat, it is discharged from the hot water outlet for use in the hot water supply system for the work area or living area. After the heat is released and the temperature drops to near room temperature, it re-enters the cooling water circulation and is introduced into the cooling chamber from the inlet. The bottom of the acid hydrolysis tank's outer liner and the cooling water jacket are supported by a network structure made of corrosion-resistant steel or titanium alloy.

[0119] Example 4: As a further possible improvement, parallel solution, or optional independent solution, an apparatus for implementing the method of producing magnesium chloride from ore is characterized in that...

[0120] The equipment for producing magnesium chloride from ore includes an acid hydrolysis tank arranged in a dedicated space;

[0121] The dedicated space includes a cement-filled outer wall 75 arranged in a rammed earth trench. The inner wall of the cement-filled outer wall 75 is in contact with the outer wall of the cooling water jacket made of corrosion-resistant metal. The cooling water jacket is provided with an acid hydrolysis tank water cooling jacket support network structure 77, which is composed of multiple sets of hollow support plates. The holes of the multiple sets of hollow support plates are interconnected.

[0122] A cooling water inlet 79 is arranged below one side of the liquid outlet end of the acid hydrolysis tank water cooling jacket, and a hot water outlet 61 is arranged above the other side of the feed inlet end of the acid hydrolysis tank water cooling jacket.

[0123] The acid hydrolysis tank water cooling jacket support network structure 77 includes a space for accommodating the acid hydrolysis tank outer liner 78; the inner wall of the acid hydrolysis tank outer liner 78 is arranged with a thermoelectric generator assembly 50.

[0124] The inner surface of the thermoelectric generator assembly 50 is provided with a titanium alloy / stainless steel liner 58 for acid hydrolysis tank, and the thermoelectric conversion unit is connected to the outer wall of the acid hydrolysis tank liner by a high thermal conductivity adhesive.

[0125] The inner wall surface of the outer tank 78 of the surface acid digester is connected to the cold surface of the thermoelectric conversion unit through a high thermal conductivity adhesive layer 74;

[0126] The outer liner 78 of the acid hydrolysis tank is fastened to the upper end face of the cement-filled outer wall 75 by the upper side fastening plate 59 of the acid hydrolysis tank and the fastening plate connecting bolts 64 thereon. Multiple observation and testing windows 63 are arranged on the side fastening plate 59 of the acid hydrolysis tank.

[0127] The thermoelectric conversion unit 72 is connected to a thermoelectric output cable through hole 69, and the thermoelectric output cable through hole 69 extends out of the outer tank 78 of the acid hydrolysis tank.

[0128] The acid lysis tank includes an acid lysis tank body 1, and a unit cover 7 is arranged on the top of the acid lysis tank body 1; the unit cover at the front end of the acid lysis tank body is provided with a hydrochloric acid injection port 3, an ore powder feeding port 5, and a gas escape collection port 4.

[0129] The unit cover 7 also includes an opening for installing a mixer; the mixer is capable of stirring the substances inside the acid hydrolysis tank.

[0130] A primary filter screen 13, i.e., an acid hydrolysis tank outlet filter screen, is arranged on the side of the outlet 11.

[0131] The substantive technical effects and implementation process of the technical solution presented herein, namely its basic functions, are as follows: the outer tank is made of stainless steel or titanium alloy that is resistant to hot water corrosion; the outer tank is a segmented composite shell, and each segment can be individually detached from the overall tank for maintenance of the thermoelectric conversion system.

[0132] The feeding system consists of a powder feeding system and an acid injection system; the ore powder is fed via a commercial-grade enclosed conveyor belt; the hydrochloric acid injection system consists of commercial-grade acid-resistant pumps, pipes, and valves.

[0133] The mixer consists of a mounting base, drive motor, transmission system, column tube, column tube brace, fan blades, and other components. Multiple mixers are installed on the unit cover of the acid hydrolysis tank to form a mixer array, which is connected by bolts. The unit cover is made of the same material as the inner liner of the acid hydrolysis tank, and the impeller and drive shaft are made of titanium alloy, nickel-based alloy or austenitic stainless steel that are resistant to chloride ion corrosion.

[0134] The slag discharger consists of a slag discharger mounting cover, drive system, slag discharge port flap, vertical pipe column, vertical pipe column diagonal brace, slide rail, lower positioning connector, bucket, and longitudinal drive shaft of the flap machine. All components are made of corrosion-resistant titanium alloy, nickel-based alloy or austenitic stainless steel.

[0135] The rear end of the acid hydrolysis tank inner liner is equipped with an upper end plate, a liquid outlet and a liquid outlet filter, and upper and lower baffles, all made of the same material as the acid hydrolysis tank inner liner; the acid hydrolysis tank inner liner body, front end plate, upper and lower end baffles, liquid outlet and liquid outlet filter are all welded together.

[0136] Water-cooled jacket support network: made of corrosion-resistant steel or stainless steel, the support network is achieved by welding, plugging or gluing.

[0137] The water-cooled jacket is embedded in a cement-filled foundation pit, which is then buried in rammed earth. A cold water inlet and inlet pipe are installed at the lower part of one end of the water-cooled jacket, leading to a water source or cooling tower / cooling water pool. A hot water outlet is installed at the upper front part of the other end, leading to a hot water supply network or cooling tower / cooling water pool.

[0138] The thermoelectric conversion layer consists of thermoelectric generators and a wiring network. The hot side of the thermoelectric generator contacts the outer surface of the acid hydrolysis tank liner through a high thermal conductivity adhesive, while the cold side contacts the inner surface of the acid hydrolysis tank liner through the same adhesive. Based on the size of the acid hydrolysis tank, the acid hydrolysis reaction rate, and the thermoelectric efficiency of the thermoelectric generators, the thermoelectric conversion units are grouped and wired together. They are connected in parallel within a group and in series between groups, or in series within a group and in parallel between groups, to form an output cable network, realizing thermoelectric output for self-use (such as driving acid injection pumps, driving powder conveyor belts, mixers, slag dischargers, etc.), or for transmission to the local power grid or to designated users, energy storage systems, etc., generating additional economic income.

[0139] Example 5: As a further possible improvement, parallel solution, or optional independent solution, the mixer includes a mixer mounting base 6, which can be mounted on the mixer mounting hole 19 on the unit cover 7 through the mixer end cover mounting bolt hole 22 to form a mixer array.

[0140] The mixer mounting base 6 is provided with a mixer column tube diagonal brace 24 and a mixer column tube 25 at the lower part; the mixer column tube 25 is hollow and has a rotating shaft in it, and a mixer drive system motor 23 is arranged on its upper part. The mixer drive system motor 23 is powered by a bevel gear and the rotating shaft is powered by a mixer impeller driven by the bevel gear shaft at the bottom of the rotating shaft.

[0141] The substantive technical effects and implementation process of the technical solution described herein, i.e., its basic functions, are as follows: all similar stirring structures on the market are within the scope of protection of this patent.

[0142] Example 6: As a further improvement, parallel, or optional independent solution, the slag discharger includes a slag discharger mounting cover 9, which is fixed to the slag discharger mounting hole on the unit cover 7 by mounting bolts. A double diagonal brace 35 for the slag discharger column pipe is provided below the slag discharger mounting cover 9. A slag discharger drive system motor 31 is arranged on the upper part of the slag discharger mounting cover 9. The slag discharger drive system motor 31 drives the chain to drive the slag discharger bucket to rise and fall. The cover is flipped and the bucket rotates through the positioning mechanism, which can send the solid residue out of the acid hydrolysis tank.

[0143] The substantive technical effects and implementation process of the technical solution described herein, i.e., its basic functions, are as follows: For example, a bucket elevator can be selected. Similar solid residue removal structures are all within the scope of protection of this patent.

[0144] Example 7: As a further improvement, parallel, or optional independent solution, the slag discharge machine mounting cover 9 is provided with a slag discharge port flap 32 and a slag discharge port flap hinge 33. When the slag discharge machine mounting cover 9 is flipped down, it can cover the slag discharge machine hopper lifting port 34.

[0145] The substantive technical effect and implementation process of the technical solution here, i.e., its basic function, are as follows: opening it allows solid residue to be discharged outside the acid hydrolysis tank.

[0146] Example 8: As a further improvement, parallel solution, or optional independent solution, the thermoelectric generator assembly 50 includes thermoelectric elements, cables, and a transformer system, capable of converting the heat of acidolysis reaction into direct current output. The substantial technical effect and implementation process of the technical solution described herein, i.e., its basic function, are as follows: similar heating-to-electric conversion structures are all within the scope of protection of this patent. The electrothermal conversion unit can comprise multiple sets, which, when arranged together, can improve thermal efficiency.

[0147] Example 9: As a further improvement, parallel, or optional independent solution, the outlet 11 of the acid hydrolysis tank is connected to the iron removal sedimentation tank 91. The iron removal sedimentation tank 91 is connected to the high-temperature evaporation crystallizer 93 after passing through the secondary filter 92. The high-temperature evaporation crystallizer 93 is connected to the cooling crystallizer 96 after passing through the tertiary filter 95. The cooling crystallizer 96 is connected to the low-temperature evaporation crystallizer 98 after passing through the quaternary filter 97. The low-temperature evaporation crystallizer 98 is connected to the high-temperature evaporation crystallizer 93 after passing through the return pipeline-valve-pump 94. A quinary filter 99 is arranged at the inlet of the return pipeline-valve-pump 94.

[0148] A ferric hydroxide collector 103 is arranged below the iron removal sedimentation tank 91;

[0149] A magnesium chloride high-temperature crystallization collector 102 is arranged below the high-temperature evaporator crystallizer 93;

[0150] Below the cooling crystallizer 96, there is a cooling crystallizer collector 101 consisting of a mixture of magnesium chloride and calcium chloride.

[0151] A low-temperature crystallizer 100 rich in calcium chloride is arranged below the low-temperature evaporation crystallizer 98.

[0152] Example 10: As a further improvement, parallel, or optional independent solution, the thermoelectric conversion unit is a Seebeck effect thermoelectric conversion system; the ferric hydroxide precipitation tank collector 103, the magnesium chloride high-temperature crystallization collector 102, the magnesium chloride + calcium chloride mixed cooling crystallization collector 101, and the low-temperature crystallization collector 100 are all moisture-proof special facilities with prominent markings.

[0153] Example 11: As a further improvement, parallel, or optional independent solution, the outer tank is made of stainless steel or titanium alloy resistant to hot water corrosion; the outer tank is a segmented composite shell, each segment of which can be individually detached from the overall tank for maintenance of the thermoelectric system; the feeding system consists of a powder feeding system and an acid injection system; the ore powder feeding is carried out via a commercial-grade enclosed conveyor belt; the hydrochloric acid injection system consists of commercial-grade acid-resistant pumps, pipes, and valves; the connecting fan blades and drive shaft of the agitator are made of titanium alloy, nickel-based alloy, or austenitic stainless steel resistant to chloride ion corrosion; the main components of the slag discharger are all made of corrosion-resistant titanium alloy, nickel-based alloy, or austenitic stainless steel;

[0154] The acid hydrolysis tank is equipped with upper and lower baffles, an outlet and an outlet filter at the end, all made of the same material as the inner tank of the acid hydrolysis tank; the inner tank body, front plate, upper and lower baffles at the end, outlet and outlet filter are all welded together.

[0155] The water jacket is made of corrosion-resistant steel or stainless steel, and the water jacket support network is also made of corrosion-resistant steel or stainless steel. The support network assembly consists of hollow plates arranged in a longitudinal and transverse manner, and the plates are assembled by welding, plugging, or gluing.

[0156] The water-cooled jacket is embedded in a cement-filled foundation pit, which is buried in rammed earth. At the end of the acid hydrolysis tank, a cold water inlet and inlet pipe are provided on the lower part of one side of the water-cooled jacket, leading to a water source or cooling tower / cooling water pool. A hot water outlet is provided at the upper front part of the other side of the water-cooled jacket, leading to a hot water supply network or cooling tower / cooling water pool.

[0157] The thermoelectric conversion layer consists of thermoelectric generators and a wiring network. The hot side of the thermoelectric generator contacts the outer surface of the acid hydrolysis tank liner through a high thermal conductivity adhesive, while the cold side contacts the inner surface of the acid hydrolysis tank liner through the same adhesive. Based on the size of the acid hydrolysis tank, the acid hydrolysis reaction rate, and the thermoelectric efficiency of the thermoelectric generators, the thermoelectric conversion units are grouped and wired together. They are connected in parallel within a group and in series between groups, or in series within a group and in parallel between groups, to form an output cable network, thereby realizing thermoelectric output for self-use, transmission to a local power grid, or transmission to designated users or energy storage systems, generating additional economic income.

[0158] Example 12: As a further improvement, parallel solution, or optional independent solution,

[0159] The acid lysis tank includes an acid lysis tank body 1, and a unit cover 7 is arranged on the top of the acid lysis tank body 1; the unit cover at the front end of the acid lysis tank body is provided with a hydrochloric acid injection port 3, an ore powder feeding port 5, and a gas escape collection port 4.

[0160] The unit cover 7 also includes an opening for installing a mixer; the mixer is capable of stirring the substances inside the acid hydrolysis tank.

[0161] A filter screen 13 for the acid hydrolysis tank outlet is arranged on the side of the outlet 11.

[0162] The slag discharge machine is a small tipping bucket elevator.

[0163] Innovatively, each of the above effects exists independently, yet a single structure can be used to combine the results.

[0164] In this case: the inner liner of the acid hydrolysis tank is an integral welded structure; the outer liner is a detachable modular shell with different materials: the inner liner has very high requirements: corrosion-resistant titanium alloy, nickel-based alloy (preferred), and stainless acid-resistant steel (optional).

[0165] It should be noted that the multiple modules in this patent are an integration of existing technology modules and do not involve any new modules. Even if some modules use programs, those programs are undoubtedly known programs.

[0166] It should be noted that the multiple solutions provided in this patent include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other without conflict to achieve multiple effects.

[0167] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. An acid hydrolysis tank, characterized in that, The acid lysis tank includes an acid lysis tank body (1), and a unit cover (7) is arranged on the top of the acid lysis tank body (1); a hydrochloric acid injection port (3), an ore powder feeding port (5), and a gas escape collection port (4) are provided on the unit cover at the front end of the acid lysis tank body. The unit cover (7) also includes an opening for installing a mixer; the mixer is capable of stirring the substances inside the acid hydrolysis tank; A filter screen (13) for the acid hydrolysis tank outlet is arranged on the side of the outlet (11).

2. The acid hydrolysis tank as described in claim 1, characterized in that, A slag remover is installed on the unit cover on the side near the liquid outlet (11); the slag remover is capable of removing the insoluble solid residue that has settled at the bottom of the tank.

3. The acid hydrolysis tank as described in claim 1, characterized in that, The acid hydrolysis tank includes an acid hydrolysis tank outer liner (78); a thermoelectric conversion unit is arranged on the inner surface of the acid hydrolysis tank outer liner (78); The hot surface of the thermoelectric conversion unit is in contact with the inner surface of the titanium alloy / stainless steel inner liner (58) of the acid hydrolysis tank through a highly thermally conductive adhesive. The thermoelectric conversion unit (72) is connected to a thermoelectric output cable through hole (69), which passes through the outer shell (78) of the acid hydrolysis tank and outputs DC power.

4. The acid hydrolysis tank as described in claim 2, characterized in that, The mixer includes a mixer mounting base (6), which can be installed on the mixer mounting hole (19) on the unit cover (7) through the mixer end cover mounting bolt hole (22) to form a mixer array; The mixer mounting base (6) is provided with a mixer column tube brace (24) and a mixer column tube (25) at the bottom. The mixer column tube (25) is hollow and has a rotating shaft. A mixer drive system motor (23) is arranged on its upper part. The mixer drive system motor (23) is connected to the rotating shaft through a bevel gear. A mixer impeller driven by the bevel gear shaft is arranged at the bottom of the rotating shaft.

5. The acid hydrolysis tank as described in claim 4, characterized in that, The slag discharger includes a slag discharger mounting cover (9), which is fixed to the slag discharger mounting hole on the unit cover (7) by mounting bolts. A double diagonal brace (35) for the slag discharger column pipe is provided below the slag discharger mounting cover (9). A slag discharger drive system motor (31) is arranged on the upper part of the slag discharger mounting cover (9). The slag discharger drive system motor (31) drives the chain to lift and lower the slag discharger bucket. The cover is flipped and the bucket is rotated through the positioning mechanism, which can send the solid residue out of the acid hydrolysis tank.

6. The acid hydrolysis tank as described in claim 5, characterized in that, The slag discharge machine mounting cover (9) is equipped with a slag discharge port flap (32) and a slag discharge port flap hinge (33). When the slag discharge machine mounting cover (9) is flipped down, it can cover the slag discharge machine hopper lifting port (34).

7. The acid hydrolysis tank as described in claim 2, characterized in that, The slag discharge machine is a tipping bucket elevator.

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