Microbiological leaching system for recleaning of rare elements in rare earth tailings

Abstract

The invention provides a system for recleaning rare elements in rare earth tailings by microbiological leaching, comprising: a wastewater tank comprising a wastewater inlet located at the top of the wastewater tank, a pH regulator feed port located at the top of the wastewater tank, a standing water discharge port located at the lower end of the wastewater tank, and an openable and closable precipitate discharge port located at the lower end of the wastewater tank, raw rare earth ore wastewater enters the wastewater tank from the wastewater inlet; the slag treatment mechanism comprises a drying device and a crushing device, and the rare earth ore tailings enter the slag treatment mechanism, then are dried in the drying device firstly, and then are crushed by the crushing device to form ore powder particles with the particle size not exceeding 0.08 mm; the bacterial liquid culture mechanism comprises a plurality of groups of bacterial liquid culture tanks, and the bacterial liquid culture tanks comprise a wastewater bacterial liquid culture group, a slag powder bacterial liquid culture group and a sediment bacterial liquid culture group; the reaction kettles comprise a wastewater reaction kettle, a slag reaction kettle and a precipitate reaction kettle.

Description

Technical Field

[0001] The invention relates to the technical field of rare earth tailings wastewater and waste residue treatment, in particular to a microbial leaching system for rare earth tailings rare element reselection. Background Art

[0002] Rare earth tailings specifically refer to wastes after beneficiation during the rare earth mining process. These wastes still contain a certain amount of rare earth elements, but due to their low grade or difficulty in extraction, they cannot be extracted again economically and effectively, so they are regarded as tailings. They are usually composed of solid particles, liquids or gases, and contain a variety of metal elements and non-metallic elements, including rare earth elements and some other valuable minerals. The generation of these tailings is accompanied by the risk of environmental pollution, because the tailings may contain toxic substances or heavy metals, which will have adverse effects on the environment and ecology if not properly handled. Therefore, the treatment and comprehensive utilization of rare earth tailings has always been an important research topic in the mining field.

[0003] The most common treatment method for rare earth tailings is to use microorganisms to treat rare earth tailings to reduce their pollution to the environment and extract a small amount of rare earth elements in the tailings. However, this type of treatment method is relatively simple and there is no integrated system. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a microbial leaching system for rare earth tailings rare elements reselection, and the present invention is implemented as follows:

[0005] A microbial leaching system for rare earth tailings rare element reselection system, comprising:

[0006] A wastewater tank, the wastewater tank comprising a wastewater inlet located at the top of the wastewater tank, a pH regulator feed port located at the top of the wastewater tank, a standing water drain port located at the lower end of the wastewater tank, and a closable sediment discharge port located at the lower end of the wastewater tank, and raw rare earth mine wastewater enters the wastewater tank from the wastewater inlet;

[0007] A slag treatment mechanism, wherein the slag treatment mechanism comprises a drying device and a crushing device. After the rare earth ore tailings enter the slag treatment mechanism, they are first dried in the drying device and then crushed by the crushing device to form mineral powder particles with a particle size not exceeding 0.08 mm;

[0008] A bacterial liquid culture mechanism, the bacterial liquid culture mechanism comprising a plurality of bacterial liquid culture tanks, wherein the bacterial liquid culture tanks include a wastewater bacterial liquid culture group, a slag powder bacterial liquid culture group and a sediment bacterial liquid culture group;

[0009] A reactor, comprising:

[0010] A wastewater reactor, the wastewater reactor comprising a raw water inlet connected to the stationary water drain outlet pipe, a wastewater bacteria liquid inlet connected to the drain outlet pipe of the wastewater bacteria liquid culture group, a first tail liquid discharge outlet and a sludge discharge outlet, a stirring device is arranged in the wastewater reactor, and a batching feed port is also arranged on the reactor;

[0011] A slag reactor, the slag reactor comprising a slag feed port, a liquid injection port, a slag powder bacterial liquid water inlet, and a discharge port, the ore powder particles enter the slag reactor from the feed port, and the configured liquid is injected from the liquid injection port, the slag powder bacterial liquid water inlet is connected to the drain outlet pipeline of the slag powder bacterial liquid culture group, the slag reactor comprises a stirring device and a roasting device, and the ore powder particles are reacted and roasted in the slag reactor to obtain bacterial liquid ore;

[0012] The sedimentation reactor comprises a sedimentation feed port, a sedimentation bacterial liquid water inlet, a slag discharge port and a second tail liquid discharge port. A stirring device is arranged in the sedimentation reactor. The sedimentation bacterial liquid water inlet is connected to the sedimentation bacterial liquid culture group pipeline.

[0013] As a further improvement, the pH regulator added from the pH regulator feed port is quicklime;

[0014] The wastewater tank is also provided with a pH value detection instrument, and the pH value of the wastewater in the wastewater tank needs to be adjusted to 8-10.

[0015] As a further improvement, the bacterial liquid cultured in the wastewater bacterial liquid culture group is a microbial bacterial liquid that utilizes ammonia nitrogen for self-growth.

[0016] As a further improvement, native plant fibers and sodium carbonate powder are added into the wastewater reactor from the ingredient feed port.

[0017] As a further improvement, a lighting device and a light intensity detection sensor are arranged in the wastewater reactor.

[0018] As a further improvement, the configured medicine solution and the bacterial solution cultured by the slag powder bacterial solution culture group are first injected into the slag reactor, and a gel solution is formed after stirring. Then, mineral powder particles are added into the slag reactor, and after stirring, the mixture is allowed to stand for 8 to 16 hours at 20 to 30° C., and then roasted.

[0019] As a further improvement, the bacterial solution cultured in the sediment bacterial solution culture group is Sinorhizobium alfalfa.

[0020] As a further improvement, the wastewater discharged from the first tail liquid outlet is wastewater that meets the discharge requirements of the Rare Earth Industry Pollutant Emission Standard (GB26451-2011);

[0021] The leachate discharged from the second tail liquid discharge port is a leachate containing lanthanum and rubidium;

[0022] The bacterial liquid ore is a ore block mainly composed of sodium carbonate and containing heavy metal elements.

[0023] The beneficial effects of the present invention are:

[0024] An integrated system is provided, which uses different microorganisms to treat wastewater and waste residues of rare earth tailings in a targeted manner, including a wastewater reactor that renders wastewater harmless and meets discharge standards. The sludge discharged is mainly sludge containing carbon and heavy metal elements, and it is easier to extract heavy metal elements from it.

[0025] The wastewater is treated and regulated in a wastewater tank to obtain a precipitate, and the precipitate is treated with a bacterial solution to obtain a leachate containing heavy metal elements;

[0026] The waste slag is added into the slag reactor for processing to obtain ore blocks containing carbon and heavy metal elements, from which it is easier to extract heavy metal elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall logical structure of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0029] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0030] A microbial leaching system for rare earth tailings rare element reselection system, comprising:

[0031] A wastewater tank 1, wherein the wastewater tank 1 comprises a wastewater inlet 11 located at the top of the wastewater tank 1, a pH regulator feed port 12 located at the top of the wastewater tank 1, a standing water outlet 13 located at the lower end of the wastewater tank 1, and a sediment outlet 14 located at the lower end of the wastewater tank 1 and openable and closable. Raw rare earth mine wastewater enters the wastewater tank 1 from the wastewater inlet 11;

[0032] A slag treatment mechanism, wherein the slag treatment mechanism comprises a drying device and a crushing device. After the rare earth ore tailings enter the slag treatment mechanism, they are first dried in the drying device and then crushed by the crushing device to form mineral powder particles with a particle size not exceeding 0.08 mm;

[0033] A bacterial liquid culture mechanism, the bacterial liquid culture mechanism comprising a plurality of bacterial liquid culture tanks, wherein the bacterial liquid culture tanks include a wastewater bacterial liquid culture group 2B, a slag powder bacterial liquid culture group 3B and a sediment bacterial liquid culture group 4B;

[0034] A reactor, comprising:

[0035] The wastewater reactor 2A includes a raw water inlet 21 connected to the stationary water outlet 13 by a pipeline, a wastewater bacterial liquid inlet connected to the outlet pipeline of the wastewater bacterial liquid culture group 2B, a first tail liquid outlet 22 and a sludge outlet 23, a stirring device is provided in the wastewater reactor 2A, and a batching feed port is also provided on the reactor;

[0036] A slag reactor 3A, the slag reactor 3A comprises a slag feed port 32, a liquid injection port 31, a slag powder bacterial liquid water inlet, and a discharge port 33. The ore powder particles enter the slag reactor 3A from the feed port, and the configured liquid is injected from the liquid injection port 31. The slag powder bacterial liquid water inlet is connected to the drain pipe of the slag powder bacterial liquid culture group 3B. The slag reactor 3A comprises a stirring device and a roasting device. The ore powder particles are reacted and roasted in the slag reactor 3A to obtain bacterial liquid ore;

[0037] The sedimentation reactor 4A comprises a sedimentation feed port 41, a sedimentation bacterial liquid water inlet, a tailings discharge port 42 and a second tailings discharge port 43. A stirring device is arranged in the sedimentation reactor 4A. The sediment in the wastewater tank 1 is transported into the sedimentation reactor 4A through the sedimentation feed port 41. The sedimentation bacterial liquid water inlet is connected to the sedimentation bacterial liquid culture group 4B by a pipeline.

[0038] As a further improvement, the pH regulator added from the pH regulator feed port 12 is quicklime;

[0039] The wastewater tank 1 is also provided with a pH value detection instrument, and the pH value of the wastewater in the wastewater tank 1 needs to be adjusted to 8-10.

[0040] As a further improvement, the bacterial liquid cultured in the wastewater bacterial liquid culture group 2B is a microbial bacterial liquid that utilizes ammonia nitrogen for self-growth. Preferably, microalgae are selected as the cultured microorganisms of the wastewater bacterial liquid culture group 2B.

[0041] As a further improvement, native plant fibers and sodium carbonate powder are added into the wastewater reactor 2A from the ingredient feed port.

[0042] As a further improvement, a lighting device and a light intensity detection sensor are provided in the wastewater reactor 2A.

[0043] As a further improvement, the configured medicine solution and the bacterial solution cultured by the slag powder bacterial solution culture group 3B are first injected into the slag reactor 3A, and a gel solution is formed after stirring. Then, mineral powder particles are added into the slag reactor 3A, and after stirring, the mixture is allowed to stand for 8 to 16 hours at 20 to 30° C., and then roasted.

[0044] As a further improvement, the bacterial solution cultured in the sediment bacterial solution culture group 4B is Sinorhizobium meliloti.

[0045] As a further improvement, the wastewater discharged from the first tail liquid outlet 22 is wastewater that meets the discharge requirements of the Rare Earth Industry Pollutant Emission Standard (GB26451-2011);

[0046] The leaching solution discharged from the second tail liquid discharge port 43 is a leaching solution containing lanthanum and rubidium;

[0047] The bacterial liquid ore is a ore block mainly composed of sodium carbonate and containing heavy metal elements.

[0048] Specifically, the native plant fibers can be low-cost plant fibers that need to be incinerated, such as corn cobs, loofahs, sawn wood, and straw.

[0049] The light intensity in the wastewater reactor 2A is maintained at 8000-12000 Lx.

[0050] Among them, the surface water of the wastewater reactor 2A after standing is wastewater that meets the discharge standards. Heavy metal elements and microorganisms are attached to the surface of native plant fibers. In order to avoid blockage of the drain outlet or the discharged wastewater does not meet the standards, as a further improvement, the first tail liquid discharge outlet 22 is located at a height of at least 100 to 150 cm from the bottom of the wastewater reactor 2A.

[0051] The bacterial solution of the slag powder bacterial solution culture group 3B is prepared according to the formula ATCC1376NH4-YE recommended by the American Type Culture Collection, and the bacterial solution of the slag powder bacterial solution culture group 3B is a bacterial solution of Bacillus subtilis.

[0052] The solution injected into the slag reactor 3A is an anhydrous calcium chloride and urea solution with a molar ratio of 1:1, and deionized water is added for mixing.

[0053] The volume ratio of the ore powder particles, the prepared drug solution and the bacterial solution in the slag reactor 3A is 1.5:1:1.

[0054] The sludge discharged from the wastewater reactor 2A and the bacterial liquid ore obtained from the slag reactor 3A are mainly sodium carbonate and contain solid components of heavy metal elements. The sludge and the bacterial liquid ore are transported to extract rare earth elements as raw materials.

[0055] The waste residue discharged from the precipitation reactor 4A is useless waste residue and can be used as building filling material or landfilled without any hazard.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microbial leaching system for rare earth tailings rare element reselection, characterized in that: include: A wastewater tank, the wastewater tank comprising a wastewater inlet located at the top of the wastewater tank, a pH regulator feed port located at the top of the wastewater tank, a standing water drain port located at the lower end of the wastewater tank, and a closable sediment discharge port located at the lower end of the wastewater tank, and raw rare earth mine wastewater enters the wastewater tank from the wastewater inlet; A slag treatment mechanism, wherein the slag treatment mechanism comprises a drying device and a crushing device. After the rare earth ore tailings enter the slag treatment mechanism, they are first dried in the drying device and then crushed by the crushing device to form mineral powder particles with a particle size not exceeding 0.08 mm; A bacterial liquid culture mechanism, the bacterial liquid culture mechanism comprising a plurality of bacterial liquid culture tanks, wherein the bacterial liquid culture tanks include a wastewater bacterial liquid culture group, a slag powder bacterial liquid culture group and a sediment bacterial liquid culture group; A reactor, comprising: A wastewater reactor, the wastewater reactor comprising a raw water inlet connected to the stationary water drain outlet pipe, a wastewater bacteria liquid inlet connected to the drain outlet pipe of the wastewater bacteria liquid culture group, a first tail liquid discharge outlet and a sludge discharge outlet, a stirring device is arranged in the wastewater reactor, and a batching feed port is also arranged on the reactor; A slag reactor, the slag reactor comprising a slag feed port, a liquid injection port, a slag powder bacterial liquid water inlet, and a discharge port, the ore powder particles enter the slag reactor from the feed port, and the configured liquid is injected from the liquid injection port, the slag powder bacterial liquid water inlet is connected to the drain outlet pipeline of the slag powder bacterial liquid culture group, the slag reactor comprises a stirring device and a roasting device, and the ore powder particles are reacted and roasted in the slag reactor to obtain bacterial liquid ore; The sedimentation reactor comprises a sedimentation feed port, a sedimentation bacterial liquid water inlet, a tailings discharge port and a second tailings discharge port. A stirring device is arranged in the sedimentation reactor. The sedimentation bacterial liquid water inlet is connected to the sedimentation bacterial liquid culture group pipeline.

2. A microbial leaching system for rare earth tailings rare element reselection as claimed in claim 1, characterized in that: The pH regulator added from the pH regulator feed port is quicklime; The wastewater tank is also provided with a pH value detection instrument, and the pH value of the wastewater in the wastewater tank needs to be adjusted to 8-10.

3. The microbial leaching system for rare earth tailings rare element reselection as claimed in claim 1, characterized in that: The bacterial liquid cultured in the wastewater bacterial liquid culture group is a microbial bacterial liquid that utilizes ammonia nitrogen to proliferate itself.

4. A microbial leaching system for rare earth tailings rare element reselection as claimed in claim 3, characterized in that: Add native plant fiber and sodium carbonate powder into the wastewater reactor from the ingredient feed port.

5. A microbial leaching system for rare earth tailings rare element reselection as claimed in claim 4, characterized in that: A lighting device and a light intensity detection sensor are arranged in the wastewater reactor.

6. The microbial leaching system for rare earth tailings rare element reselection as claimed in claim 1, characterized in that: The slag reactor is first injected with the configured drug solution and the bacterial solution cultured by the slag powder bacterial solution culture group, and a gel solution is formed after stirring. Then, mineral powder particles are added into the slag reactor, and after stirring, the mixture is allowed to stand for 8 to 16 hours at 20 to 30° C., and then roasted.

7. The microbial leaching system for rare earth tailings rare element reselection as claimed in claim 1, characterized in that: The bacterial liquid cultured in the sediment bacterial liquid culture group is Sinorhizobium alfalfa.

8. The microbial leaching system for rare earth tailings rare element reselection as claimed in claim 1, characterized in that: The wastewater discharged from the first tail liquid outlet is wastewater that meets the discharge requirements of the Rare Earth Industry Pollutant Emission Standard (GB26451-2011); The leachate discharged from the second tail liquid discharge port is a leachate containing lanthanum and rubidium; The bacterial liquid ore is a ore block mainly composed of sodium carbonate and containing heavy metal elements; The sludge discharged from the sludge discharge port of the wastewater reactor is sludge mainly composed of sodium carbonate and containing heavy metal elements.

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