CN205556747U - Oxidation manganese ores electromagnetism reducing roasting device - Google Patents

Abstract

The utility model discloses an electromagnetic reduction roasting device for manganese oxide ore. The device includes a vertically arranged roasting tube, the top of the roasting tube is a feed inlet, and two LC oscillating lines are wound outside the roasting tube, wherein the winding pitch of the LC oscillating lines wound on the upper half of the roasting tube is 100‑300mm, as the preheating section, and the winding pitch of the LC oscillation circuit wound in the lower half of the roasting tube is 20‑100mm, as the reduction section. The utility model has the beneficial effects of energy saving, uniform temperature, long service life, continuous discharge and good operating environment.

Description

An electromagnetic reduction roasting device for manganese oxide ore

technical field

The utility model relates to a reduction and roasting device for manganese oxide ore, in particular to an electromagnetic reduction and roasting device for manganese oxide ore.

Background technique

At present, my country has become the world's largest consumer of manganese resources. Iron and steel output has jumped to the first place in the world, and iron and steel smelting must not be separated from manganese resources. The output of electrolytic manganese metal products accounted for the world's 90% Above, my country is also the world's most important producer of electrolytic manganese dioxide and industrial manganese sulfate. However, my country's manganese resource reserves are very limited, mainly distributed in Hunan, Guangxi, Guizhou and other provinces, and most of them are poor ores, and there are almost no high-grade rich ores that meet international commodity grades. my country needs manganese ore every year 1500 10,000 tons, forcing the iron and steel and manganese product industries to import a large amount of foreign manganese ore every year, and the import volume of manganese ore exceeds 10% speed increases. Due to economic reasons, most of the imported manganese ores are high-grade natural manganese dioxide ores. After importing, the hydrometallurgical industry must undergo reduction roasting to manganous oxide before it can be used. The reduction roasting of natural manganese dioxide ore has become an important research topic in the metallurgical industry.

last century 80 In the 1990s, reverberatory furnaces were mostly used for the roasting and reduction of natural manganese dioxide ore, and thousands of reverberatory furnaces of different sizes were built in China. Reverberatory furnace reduction roasting has disadvantages such as high energy consumption, poor reduction uniformity, low reduction rate, and high labor intensity of manual operation. The second is rotary kiln reduction roasting, the production environment has improved, but the problem of high energy consumption has not been resolved. Regarding the issue above, 1984 In 2010, Beijing General Research Institute of Mining and Metallurgy and Baodai Chemical Experimental Factory of Zhulu County, Hebei Province jointly designed and built a single-tube moving bed natural manganese dioxide ore reduction shaft furnace. The test was successful and passed the provincial technical appraisal. This enabled my country to take the lead in the world in natural manganese dioxide reduction roasting technology, but it was not popularized and applied in time until 2007 In 2010, Hunan Luxi Jinxu Metallurgical Group, based on the Beijing General Research Institute of Mining and Metallurgy, built four multi-tubular moving bed shaft furnaces with gas generator gas as the heat source after transformation. factory. 2010 In 2010, Hechi, Guangxi, and Longgong Manganese Industry of Guangxi have built multi-tubular moving bed shaft furnaces and put them into production. The maximum size is 2010 Ningxia Tianyuan Manganese Industry completed annual production 40 10,000 tons reduced manganese multi-tubular moving bed shaft furnace. Domestic enterprises that use imported high-grade manganese dioxide ore as raw material have built multi-tubular moving bed reduction shaft furnaces with gas as heat source in just a few years. Guizhou Nengkuang Manganese Industry Group is also 2011 annual output 6 10,000 tons reduced manganese single furnace 12 The tube moving bed reduction shaft furnace was completed and put into production that year. Guizhou Nengkuang Manganese Industry Group, with its strong and multi-professional technical team, conducts research on the multi-tubular moving bed reduction shaft furnace that has been put into production, conducts economic and technical evaluations, and also sends technicians in batches to conduct research on the same type of large-scale domestic equipment. To investigate and compare. Today, the industry has reached a consensus that the multi-tube moving bed reduction shaft furnace is more advanced than the reverberatory furnace and the rotary kiln roasting reduction furnace, the operating conditions of the workers are improved, and the environmental pollution is reduced, but there are still many defects.

First, according to three-year production statistics, each ton of manganese dioxide ore will consume 340kg Gas coal is used as the fuel of the gas generator, and the whole furnace is heated with gas, and the heat is transmitted to the manganese dioxide ore in the tube through the heat-resistant stainless steel tube wall. The temperature of residual gas discharged from the furnace is still as high as 600 ℃, plus heat conduction, convection, and radiation energy loss during the operation of the roaster, the overall heat energy utilization rate is low, which is only 25% , according to economic accounting, the cost of roasting and reducing one ton of imported manganese dioxide ore needs to reach 480 Yuan.

Second, the flame of coal gas burning in the furnace is not very stable, and the temperature of the entire reduction section fluctuates greatly, requiring operators to adjust the gas volume and air flow at any time. The operation requirements are high, the operation adjustment is difficult, and cannot be effectively controlled.

Third, the flame temperature at the gas inlet is higher than that of the entire furnace. 100 Above ℃, the impact of the flame on the heat-resistant stainless steel pipe is relatively serious. Although the direct impact part is covered with a layer of refractory material outside the heat-resistant stainless steel pipe to protect the heat-resistant stainless steel pipe, overheating cannot be avoided. In addition, there is corrosion after gas combustion Sulfur dioxide gas, generally used for heat-resistant stainless steel pipes 6 After one month, it was burned through, and a new tube needs to be replaced. The service life of the heat-resistant stainless steel tube of this structure roasting furnace is short.

Fourth, the multi-tubular moving bed reduction shaft furnace has generally adopted intermittent feeding and discharging methods from the beginning until now. Currently, there are two popular methods: one is the spiral discharging mechanism, and the spiral rotating discharge mechanism is preset. material 4 seconds, then stop 80 The material is discharged after a second; another mechanical transmission plate structure, the plate is opened to discharge the material 4 seconds, then close 80 Second. The materials in these two methods stay in a state of residence most of the time during the roasting process, which is likely to cause clogging, sintering and other phenomena. When the clogging and sintering are serious, the operator needs to poke the material with a steel drill under high temperature conditions.

Fifth, the roasting workshop generally has many reduction grates in a row, and the whole workshop is in a high temperature state. Gas burning also leaks sulfur dioxide gas, and the operating environment for workers is relatively harsh.

Contents of the invention

The purpose of the utility model is to provide a manganese oxide ore electromagnetic reduction roasting device. The utility model has the characteristics of energy saving, uniform temperature, long service life, continuous discharge and good operating environment.

Technical scheme of the utility model: An electromagnetic reduction roasting device for manganese oxide ore, comprising a vertically arranged roasting tube, the top of the roasting tube is a feed inlet, and two LC Oscillating line in which the LC The winding pitch of the oscillating line is 100-300mm , wrapped around the lower half of the firing tube LC The winding pitch of the oscillating line is 20-100mm .

The aforementioned manganese oxide ore electromagnetic reduction roasting device, the said LC The winding pitch of the oscillating line is 150-220mm , as a preheating section, wound around the lower half of the roasting tube LC The winding pitch of the oscillating line is 40-60mm , as the restore segment.

The aforementioned manganese oxide ore electromagnetic reduction roasting device, the described LC The oscillating line is a hollow copper tube, and cooling water is passed through the tube.

In the aforementioned manganese oxide ore electromagnetic reduction roasting device, the outer tube wall of the roasting tube and the LC There is a gap between the oscillating lines, the width of the gap is 10-100mm , There is a layer of insulating glass wool in the gap.

The aforementioned manganese oxide ore electromagnetic reduction roasting device, the outer tube wall of the roasting tube and LC The spacing of the gaps between the oscillating lines is 50-70mm .

The aforementioned manganese oxide ore electromagnetic reduction roasting device, the bottom of the roasting tube is connected with a discharge pipe, the bottom of the discharge pipe is provided with a gap, the roasting tube at the gap is provided with a continuous discharge device, and the continuous discharge The device includes a rotating cone, a scraper 2 is arranged on the rotating cone, and a bottom plate is arranged under the rotating cone, and there is a gap between the bottom plate and the bottom end of the discharge pipe. 8-12mm The bottom of the bottom plate is connected with a gear box, and the gear box is connected with a frequency conversion motor through a shaft.

Beneficial effects of the utility model: the utility model has the following beneficial effects by improving the traditional multi-tube moving bed manganese dioxide ore reduction and roasting furnace:

1 , the utility model by using LC The oscillating circuit directly heats the roasting tube, and the roasting tube transfers heat directly to the material inside it, because the material reaction in the roasting tube itself is an exothermic reaction:

2MnO2+C = 2MnO+CO2 ↑ +174.6KJ

But the heat generated by the chemical reaction is not enough to maintain the reaction required to maintain 830 The energy required for the temperature of ℃, so it is necessary to add a part of heat from the outside to keep the whole reaction system 830 °C, the chemical reaction will continue. Therefore, the utility model is arranged outside the roasting tube LC An oscillating circuit, which can automatically adjust the output power of the circuit through the temperature in the roasting tube, and control the temperature stably at the temperature required for the reaction, without wasting excess energy; at the same time, the utility model LC The oscillating circuit is divided into upper and lower sections. The winding distance of the upper section is larger, and the temperature of this section is lower, which can preheat the materials in the upper section of the roasting tube; the winding spacing of the lower section is smaller. Under the same power, this section The temperature is higher, so that the materials in the roasting tube located in this section undergo reduction reaction, which further improves the reduction efficiency and saves energy consumption.

2 , the utility model LC The output power of the oscillating circuit is automatically adjusted according to the temperature in the roasting tube, which ensures that the temperature in the roasting tube can be uniformly within the temperature range required for the reaction.

3 , the utility model through LC The oscillating circuit is used to realize electromagnetic heating, which avoids external high-temperature corrosion and prolongs the service life of the roasting tube.

4 , The utility model can achieve the purpose of continuous discharging and continuous feeding by designing an automatic continuous feeding and discharging mechanism. After measurement, no matter where the frequency conversion motor is set at any frequency position, the discharging speed is very stable. The quantity of material discharged in the time period is very uniform. It can not only prevent material sintering, but also facilitate process control.

5 . The high-temperature part of the roasting reduction of the utility model is completely controlled in the tube, and the temperature outside the tube is close to room temperature, which not only saves energy consumption, but also has a good working environment. Material and feed are carried out under airtight conditions to prevent dust pollution. A small amount of sulfur dioxide gas generated during the roasting process is absorbed by the manganese dioxide in the upper preheating section, and no strong sulfur dioxide gas is released from the furnace top.

Description of drawings

Attached picture 1 It is a longitudinal sectional view of the utility model;

Attached picture 2 It is a partial enlarged view of the automatic discharge device;

Attached picture 3 A top view of a rotating cone.

Explanation of reference signs: 1- case, 2- storage bin, 3- Feed hopper, 4- Stirring motor, 5- Agitator shaft, 6- scraper one, 7- Inlet, 8- roasting tube, 9-LC oscillating line, 10- bakelite bracket, 11- cooling device, 12- water intake, 13- Outlet, 14- rotating cone, 15- Gearbox, 16- shaft, 17- Inverter motor, 18- lower silo, 19- gap, 20- scraper two, twenty one- bottom plate, twenty two- discharge pipe.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for limiting the utility model.

Embodiment of the present utility model: a manganese oxide ore electromagnetic reduction roasting device, as shown in the accompanying drawing 1-3 As shown, the device includes a vertically arranged roasting tube 8 , roasting tube 8 located in the shell 1 In, the roasting tube 8 The top of the feed port 7 , roasting tube 8 There are two outer windings LC Oscillation circuit 9 , LC Oscillation circuit 9 The upper and lower ends are respectively fixed on the roasting tube 8 Bakelite fixing bracket on one side 10 on, which is wound on the roasting tube 8 upper part of LC Oscillation circuit 9 The winding distance is 100-300mm , as a preheating section, wound around the roasting tube 8 lower part of LC Oscillation circuit 9 The winding distance is 20-100mm , as the restore segment.

As a preference, the said winding in the roasting tube 8 upper part of LC Oscillation circuit 9 The winding distance is 150-220mm , wrapped around the roasting tube 8 lower part of LC Oscillation circuit 9 The winding distance is 40-60mm .

As a preference, the LC Oscillation circuit 9 The most is a hollow copper tube, and cooling water is passed through the tube.

As a preference, the roasting tube 8 the outer wall of the LC Oscillation circuit 9 There is a gap between them, the width of the gap is 10-100mm , There is a layer of insulating glass wool in the gap.

As a preference, the roasting tube 8 the outer wall of the LC Oscillation circuit 9 The spacing between the gaps is 50-70mm .

As a preference, the roasting tube 8 There is a discharge pipe connected to the bottom of the twenty two , discharge pipe twenty two notched bottom 19 , the notch 19 roasting tube 8 There is a continuous discharge device inside, and the continuous discharge device includes a rotating cone 14 , a rotating cone 14 Scraper 2 20 , a rotating cone 14 bottom plate twenty one , the bottom plate twenty one with discharge pipe twenty two between the bottom 8-12mm spacing, floor twenty one The lower part is connected to the gearbox 15 ,Gearbox 15 Via shaft 16 Connected with frequency conversion motor 17 .

The working principle of the utility model is as follows: the manganese oxide ore is 7 into the roasting tube 8 middle, LC Oscillation circuit 9 Electricity generates an alternating magnetic field, roasting the tube 8 Self-heating in an alternating magnetic field, where the upper half LC Oscillation circuit 9 The turn spacing is 100-300mm , the section of the roasted tube 8 resulting in a lower temperature, the 300 ℃ -400 ℃, to preheat the manganese oxide ore located in this section, at the same time, the second half of the LC Oscillation circuit 9 The turn spacing is 20-100mm , the section of the roasted tube 8 The resulting higher temperature, in 800 ℃ -850 Between ℃, the manganese oxide ore located in this section is heated and reduced.

As a preference, by wrapping the roasting tube 8 Up LC Oscillation circuit 9 The hollow copper tube is selected, and the cooling water is passed into the copper tube, and the cooling water will LC Oscillation circuit 9 take away the heat on the tube by lowering the roasting 8 temperature outside the tube.

As a preference, through the LC Oscillation circuit 9 with roasting tube 8 set between 10-100mm The gap, and the insulation glass wool layer is set in the gap, not only for the roasting tube 8 It has the effect of heat preservation, reduces heat loss, and further reduces the temperature of the roasting tube 8 temperature outside the tube.

As a preference, through the roasting tube 8 Set the discharge pipe below the twenty two , and in the discharge pipe twenty two set the gap at the lower end of the 19 , and in the gap 19 discharge pipe at twenty two A continuous discharge device is installed inside, and the frequency conversion motor of the continuous discharge device 17 through shaft 16 and gearbox 15 drive rotating cone 14 turn, spin the cone 14 scraper two on 20 will be located in the discharge pipe twenty two Inner reduced manganese oxide ore from the gap 19 It can be scraped out at any place, realizing the purpose of continuous discharge.

When the utility model is used, it can be used in the roasting tube 8 The top of the feeding device is set, the feeding device includes a storage box 2 , storage bin 2 The top has a feed hopper 3 , a stirring motor is installed in the middle 4 ,Stirring motor 4 agitator shaft 5 Reach into the storage box 2 After that, a scraper is installed on its top 6 , storage bin 2 There is a round hole at the bottom, and the round hole is aligned with the roasting tube 8 feed port 7 ,Stirring motor 4 drive scraper one 6 storage bin 2 The manganese oxide ore inside is evenly scraped into each roasting tube 8 .

When the utility model is used, the discharge pipe can be twenty two set a cooling device on the outside of the 11 , the cooling device 11 Set in the discharge pipe twenty two on the outside, which is provided with a water inlet 12 and a water outlet 13 , cold water from the inlet 12 Enter the device, absorb the discharge pipe twenty two After the heat in the water outlet 13 The outflow in the medium speeds up the cooling rate of the reduced manganese oxide ore.

When the utility model is used, it can also be used in the discharge pipe twenty two Set up a lower silo below the 18 , the lower silo 18 It is in the shape of an inverted triangular cone, which can twenty two The reduced manganese oxide ore that falls out of the process falls into the collection device located below the utility model after being concentrated.

Claims (6)

1. An electromagnetic reduction roasting device for manganese oxide ore, characterized in that: it includes a vertically arranged roasting tube (8), the top of the roasting tube (8) is a feed inlet (7), and the roasting tube (8) There are two LC oscillating lines (9) wound on the outside, the LC oscillating line (9) wound on the upper part of the roasting tube (8) has a winding pitch of 100-300 mm, and the LC oscillating line (9) wound on the lower part of the roasting tube (8) The winding pitch of the oscillating circuit (9) is 20-100mm. 2. The electromagnetic reduction roasting device for manganese oxide ore according to claim 1, characterized in that: the winding distance of the LC oscillating line (9) wound on the upper half of the roasting tube (8) is 150-220mm, as In the preheating section, the LC oscillating line (9) wound on the lower half of the roasting tube (8) has a winding pitch of 40-60 mm, which is used as a reduction section. 3. The electromagnetic reduction and roasting device for manganese oxide ore according to claim 1 or 2, characterized in that: the LC oscillating circuit (9) is a hollow copper tube, and cooling water is passed through the tube. 4. The electromagnetic reduction roasting device for manganese oxide ore according to claim 1, characterized in that there is a gap between the outer tube wall of the roasting tube (8) and the LC oscillation circuit (9), and the width of the gap is 10- 100mm, and a layer of insulating glass wool is provided in the gap. 5. The electromagnetic reduction roasting device for manganese oxide ore according to claim 4, characterized in that the distance between the outer tube wall of the roasting tube (8) and the LC oscillation line (9) is 50-70mm . 6. The electromagnetic reduction roasting device for manganese oxide ore according to claim 1, characterized in that: a discharge pipe (22) is connected below the roasting pipe (8), and a gap is provided at the bottom of the discharge pipe (22) (19), the roasting tube (8) at the gap (19) is provided with a continuous discharge device, the continuous discharge device includes a rotating cone (14), and a scraper is provided on the rotating cone (14). Plate two (20), the bottom of the rotating cone (14) is provided with a base plate (21), and there is a distance of 8-12mm between the base plate (21) and the bottom end of the discharge pipe (22), and the base plate (21) The bottom is connected with a gear box (15), and the gear box (15) is connected with a variable frequency motor (17) via a coupling shaft (16).