CN202945068U - Equipment for producing manganous oxide by reduction of low-grade manganese oxide ore via biomass - Google Patents

Abstract

The utility model discloses a device for producing manganese monoxide by reducing low-grade manganese oxide ore by biomass, which belongs to the technical field of black metallurgy. The tail of the rotary kiln of the device is provided with a biomass gas burner. The furnace is connected, the reaction furnace is connected with the simmering tank, and the simmering tank is connected with the spiral cooler. The utility model first crushes the minerals, reduction catalysts and biomass respectively and then mixes them. In the rotary kiln, the minerals, reduction catalysts and biomass are mixed. Drying, through the combustion of biomass gas, the reduction reaction between biomass and minerals is ignited, the raw materials enter the reaction furnace, enter the autothermal reduction reaction, use the reaction heat in the reaction furnace to further accelerate the reduction of minerals, and then enter the Stew in the tank to make the reaction more complete, and then cool to normal temperature to obtain mineral powder grade manganese monoxide. Overcoming the traditional reduction of manganese oxide mainly using coal as a reducing agent, its reduction temperature is high, energy consumption is large, and production cost is high.

Description

A device for producing manganese monoxide by reducing low-grade manganese oxide ore with biomass

technical field

The utility model belongs to the technical field of black metallurgy, in particular to a device for producing manganese monoxide by reducing low-grade manganese oxide ore with biomass. the

Background technique

my country is a big country of manganese production, and at the same time it is a country that is very short of manganese ore resources. It needs to import a large amount of manganese ore from abroad. In 2010, the import of manganese ore exceeded 10 million tons. At present, most domestic electrolytic manganese enterprises use manganese carbonate as raw material for production. The manganese ore in manganese carbonate ore has low manganese content and high calcium and magnesium content, resulting in excessive acid consumption and large tailings in the electrolysis process. The environment creates enormous pressure. In order to solve resource and environmental problems, reduce the cost of electrolytic manganese enterprises, and improve the market competitiveness of electrolytic manganese enterprises, it is necessary to replace manganese carbonate ore with low-grade manganese oxide ore, which is rich in resources and not fully utilized at present. the

Traditional manganese oxide reduction mainly uses coal as a reducing agent, which has high reduction temperature, high energy consumption, high production cost, and no mature process equipment, which limits the development of manganese dioxide reduction to manganese monoxide technology. the

Utility model content

The purpose of this utility model is to mainly use coal as the reducing agent for traditional manganese oxide reduction, which has high reduction temperature, high energy consumption, high production cost, and no mature process equipment at the same time, thereby limiting the technology of reducing manganese dioxide to manganese monoxide Insufficient in the development, provide a kind of equipment that biomass reduces low-grade manganese oxide ore to produce manganese monoxide, it is characterized in that, the equipment that described biomass reduces low-grade manganese oxide ore to produce manganese monoxide includes rotary kiln, reaction furnace and smoldering A feeding screw propeller is set in front of the rotary kiln, and a biomass gas burner is set at the rear of the rotary kiln. The rotary kiln is connected to the reaction furnace through the reaction furnace propeller, the reaction furnace is connected to the simmering tank, and the simmering tank is connected to the spiral cooling tank. The outlet of the spiral cooler is provided with a sprinkler and a circulating water pump, and the biomass gas burner is connected with the burners of the biomass gasification furnace and the reaction furnace through the biomass air duct. the

The material outlet of the cyclone dust removal is connected to the feeding screw propeller, and the discharge port of the bag dust removal is connected to the lower feeding port of the feeding screw propeller. the

A stirring device is arranged in the reaction furnace, and the reaction furnace is connected with the heat return pipe of the reaction furnace. the

The rotary kiln is connected with bag dust removal and induced draft fan through cyclone dust removal, and the gas and dust in the rotary kiln are discharged into the atmosphere through cyclone dust removal, bag dust removal and induced draft fan in sequence. the

The beneficial effect of the utility model is that the utilization and heat preservation of heat are fully considered in the whole process circuit. In order to improve the thermal efficiency of the system and reduce the consumption of biomass, the purpose of heat preservation is to avoid the bonding of materials and equipment. Blockage of process equipment. Overcoming the traditional reduction of manganese oxide mainly using coal as a reducing agent, its reduction temperature is high, energy consumption is large, and production cost is high. The present invention proposes to use biomass as a reducing agent to reduce its reduction temperature to below 450 degrees. Through the heat utilization system, the reaction heat is fully utilized, the energy is used reasonably, and the production cost is further reduced. the

Description of drawings

Fig. 1 Biomass reduction process. the

Fig. 2 is a schematic diagram of process equipment for reducing manganese dioxide to manganese monoxide with biomass. the

Labels in the figure: 1-induced fan; 2-bag dust removal; 3-cyclone dust removal; 4-rotary kiln; ;9-reaction furnace propeller; 10-biomass gasification furnace; 11-reaction furnace; 12-stewing tank; 13-spiral cooler; 14-water shower; Screw propeller 17-reaction furnace burner, 18-circulating water pump; 19-gas distribution valve group;

Detailed ways

The utility model provides a device for producing manganese monoxide by reducing low-grade manganese oxide ore with biomass. Below in conjunction with embodiment and accompanying drawing, the utility model is further described, but does not limit the utility model in any way. the

Figure 2 shows the process equipment for reducing manganese dioxide to manganese monoxide with biomass. In the figure, the rotary kiln 4 is provided with a feeding screw propeller 16, and the tail of the rotary kiln 4 is provided with a biomass gas burner 6. 4 The reaction furnace propeller 9 is connected to the reaction furnace 11, the reaction furnace 11 is connected to the simmering tank 12, a stirring device is arranged in the reaction furnace 11, and the reaction furnace 11 is connected to the reaction furnace return heat pipe 8; the simmering tank 12 is connected to the spiral cooling The device 13 is connected, and the outlet of the spiral cooler 13 is provided with a shower 14 and a circulating water pump 18 . The biomass gas burner 6 and the reaction furnace burner 17 are connected to the biomass gasifier 10 through the biomass air duct 7 . The gas and dust in the rotary kiln 4 pass through the cyclone dust removal 3 and the bag dust removal 2 successively, and the dust-cleaned gas passes through the induced draft fan 1 and is discharged into the atmosphere. The material discharge port of the cyclone dust collector 3 is connected to the feeding screw propeller 16 , and the discharge port of the bag dust collector 2 is connected to the lower feeding port of the feeding screw propeller 16 . The reaction furnace 11, the stewing pot 12, the preheating rotary kiln 4, the cyclone dust removal 3, and the bag dust removal 2 are all coated with heat-insulating ceramic wool for heat preservation. The interconnected pipelines are also insulated. the

Figure 1 shows the reduction process of biomass reduction of low-grade manganese oxide ore to produce manganese monoxide. In the figure, the ground ore powder, biomass and reduction catalyst are mixed into a raw material mixture at a ratio of 100:3:15 (mass ratio), and the mineral, reduction catalyst and biomass, and the raw material mixture enter the feeding screw propeller 16 It is transported to the rotary kiln 4, where the raw material mixture is heated in countercurrent and dried. At the tail of the rotary kiln 4, a biomass gas burner 6 is arranged, through which the reduction reaction between biomass and minerals is ignited. Afterwards, the raw material enters the reaction furnace propeller 9, which is further transported to the reaction furnace 11. On the top of the reaction furnace 11, a motor-driven reaction furnace agitator is arranged to stir the raw material mixture, and at the same time, promote the reduction reaction happened. The temperature of the reaction furnace is controlled between 350-450 degrees Celsius. At this temperature, the feed mixture is approximately semi-fluid. After reacting for a period of time, it enters the stewing tank 12, and the material reacts further in the stewing tank 12, and is gradually pushed out by the screw propeller into the spiral cooler 13, and the reaction is complete at this time; The outlet of the cooler 13 is cooled by countercurrent water, and the outlet is cooled by water shower 14 to obtain roasted products, which are collected by the collector, and the water spray cooling is controlled by the circulating water pump 18. The amount of water sprayed is 5% of the mineral amount. -10%. To reduce the activity of minerals to facilitate preservation. the

During the above reduction reaction process, the biomass gas produced by the biomass gasification furnace 10 is mixed with hot air for combustion, and in the rotary kiln 4, the raw material mixture is heated in countercurrent and dried. In the reaction furnace 11, the bottom of the reaction furnace is directly heated, and the biomass gas generated in the reaction furnace 11 contains CO and H ₂ , thereby forming a reducing atmosphere, and the temperature in the reaction furnace is 350°C to 450°C, and the mixed ore The material remains in a fluid state; wherein, firstly, the ambient air is blown into the jacket of the stewing tank 12 for preliminary heating, and the heated air enters the jacket of the reaction furnace, and then enters the gas distribution valve group 19 , at this time, the hot air is divided into three paths, one path enters the biomass gasification furnace to perform gasification reaction on the biomass, and the other path enters the rotary kiln 4 through the gas distribution valve group 19 to preheat the rotary kiln 4 , and another way, through the gas distribution valve group 19, it enters the reactor burner 17, and is mixed with biomass gas for combustion.

The preheated gas and dust in the rotary kiln 4 enter the cyclone dust collector 3 for the first stage dust removal, and then enter the bag dust collector 2 through the pipeline, and discharge the dust-cleaned gas into the dust collector through the induced draft fan 1. In the atmosphere. the

Powdered manganese dioxide ore with a particle size below 80 mesh, reduction catalyst (the reduction catalyst is a mixture of pyrite and coal gangue, wherein the mass ratio of coal gangue to pyrite is 3:1) and biomass powder as raw materials The material is straw, wood chips or bamboo chips and their mixtures; they are mixed at a ratio of 100:3:15 (mass ratio) and dried and preheated through the rotary kiln 4. The temperature inside the rotary kiln 4 is 200°C. The time for preheating and drying is about 20 minutes; the heat source in the kiln is provided by the combustion of biomass gas, the hot gas taken away by the external heating of the reaction furnace 11, the hot gas discharged from the reaction furnace 11 and the hot gas after the cooling of the stewing tank 12, and the rotary The gas discharged from the kiln is drawn by the cyclone dust collector and the bag dust collector, and is drawn by the induced draft fan; the biomass gas is ignited and burned,

Thermocouples and pressure measuring points are installed at the inlet and outlet of the preheating rotary kiln and reaction furnace to measure the temperature and pressure at this point; The discharge pipe) is provided with a flow measurement point; the measurement and control instruments are installed in the control cabinet to implement centralized control. The fuel is also biomass gas. In order to ensure that the temperature of each point can be adjusted during the experiment, the biomass gas pipeline is equipped with a flow measuring point, and the temperature of the equipment is controlled by adjusting the flow of the biomass gas through a valve. the

The reaction furnace of the present invention adopts the form of a vertical mixer, so that the fluid powder is not easy to deposit in the furnace, and the reaction can be accelerated and the reaction is more sufficient; the outlet of the reaction furnace is arranged at a certain height, and when the furnace ore reaches The preset volume will automatically flow out of the furnace. There is a discharge port at the bottom of the furnace for easy cleaning. Experiments show that the present invention is easy to operate, stable and controllable. the

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims. the

Claims (5)

1. a biomass reduction Low grade manganese ore is produced the equipment of manganese monoxide, it is characterized in that: this equipment comprises rotary kiln (4), Reaktionsofen (11) and stewingization tank (12), rotary kiln (4) arranges material loading spiral propeller (16), rotary kiln (4) afterbody is provided with biomass gas burner (6), rotary kiln (4) is connected with Reaktionsofen (11) through Reaktionsofen thruster (9), Reaktionsofen (11) is connected with stewingization tank (12), stewingization tank (12) is connected with spiral water cooler (13), discharge port at spiral water cooler (13) is provided with water drenching device (14).

2. a kind of biomass reduction Low grade manganese ore according to claim 1 is produced the equipment of manganese monoxide, and it is characterized in that: biomass gas burner (6) is connected through the burner (17) of biomass airway (7) with biomass gasifying furnace (10) and Reaktionsofen (11).

3. a kind of biomass reduction Low grade manganese ore according to claim 1 is produced the equipment of manganese monoxide, it is characterized in that: rotary kiln (4) is connected 1 with bag-type dust (2) with induced draft fan through cyclone dust removal (3)) be connected, gas in rotary kiln (4) and dust are successively through cyclone dust removal (3), bag-type dust (2) and induced draft fan (1), and the gas that dedusting is clean is drained among atmosphere.

4. a kind of biomass reduction Low grade manganese ore according to claim 3 is produced the equipment of manganese monoxide, it is characterized in that: the material outlet of cyclone dust removal (3) is connected with material loading spiral propeller (16), the discharge port of bag-type dust (2) is linked into the lower opening for feed of material loading spiral propeller (16).

5. a kind of biomass reduction Low grade manganese ore according to claim 1 is produced the equipment of manganese monoxide, and it is characterized in that: Reaktionsofen is provided with whipping appts in (11), and Reaktionsofen (11) is connected with Reaktionsofen product heat cal rod (8).

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