Molybdenum concentrate roasting device

Abstract

The utility model belongs to the technical field of molybdenum concentrate processing, and discloses a molybdenum concentrate roasting device which comprises an electric furnace support and a roasting furnace fixedly connected to the electric furnace support, the bottom end of the roasting furnace is connected with a preheating furnace through a furnace tube, and the air inlet end of the preheating furnace is connected with an air blower. One side of the top of the furnace tube is connected with a feeder through a feeding pipe, the top end of the roasting furnace is communicated with a molybdenum reaction product collector through a collecting pipeline, and one side of the top end of the molybdenum reaction product collector is communicated with a rhenium reaction product collector through a connecting pipeline. The required temperature in the roasting furnace is quickly reached, and the roasting speed and efficiency are improved; in addition, reaction products (molybdenum reaction products and rhenium reaction products) with different desublimation temperatures generated by molybdenum concentrate oxidizing roasting can be collected through accurate temperature control, and classified collection of the reaction products in the molybdenum concentrate roasting process is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molybdenum concentrate processing, and in particular relates to a molybdenum concentrate roasting device. Background Art

[0002] Molybdenum concentrate is lead gray, similar to graphite, with metallic luster, belonging to the hexagonal system, and the crystals are often in the form of hexagonal flakes, with patterns on the bottom, soft and slippery, and thin and flexible flakes. Molybdenum concentrate is usually processed by roasting in a roasting furnace, because the useful components in molybdenum concentrate are molybdenum sulfide and a small amount of rhenium sulfide. After high-temperature roasting, molybdenum and rhenium can form oxides and volatilize (MoO 3 It starts to volatilize when the temperature is above 700℃. 2 O 7 When the temperature is above 360℃, it starts to volatilize. After the oxides of molybdenum and rhenium are volatilized and cooled, the oxides of molybdenum and rhenium can be collected separately by using the difference in their condensation temperatures (MoO 3 It starts to condense at 700-750℃. 2 O 7 When the temperature is lower than 300℃, it starts to desublimate, while impurities such as silicon dioxide and calcium carbonate remain in the calcined slag, so that the useful components molybdenum and rhenium can be recovered.

[0003] Existing molybdenum concentrate roasting devices, such as a molybdenum concentrate roasting device disclosed in a utility model patent with authorization announcement number CN208653218U, include a furnace body, a cooling plate and a flue gas recovery device, wherein an explosion-proof port is fixedly installed on the upper outer surface of the furnace body near the middle portion, and the interior of the furnace body near the middle portion is a roasting layer, a boiling layer is fixedly installed below the roasting layer, and a distribution plate is fixedly installed below the boiling layer, a collecting box is fixedly installed on the outer surface of one side of the furnace body, and a collecting pipe is fixedly installed on the upper outer surface of the collecting box, and the volatilized useful component molybdenum and rhenium is recovered by arranging the cooling plate.

[0004] The current molybdenum concentrate roasting device has the following obvious shortcomings: first, the existing device is not designed with a preheating device, and the required temperature in the furnace cannot be quickly reached during the processing, which takes a long time and the roasting speed and efficiency are low; and the existing technology simply sets a collection box, cools and condenses through a cooling plate to achieve separation, and cannot accurately control the temperature, and cannot achieve selective condensation and collection of different volatile products. For example, when rhenium-containing molybdenum concentrate is processed using the existing molybdenum concentrate roasting device, the volatile products molybdenum and rhenium oxides (MoO 3 and Re 2 O 7 ) are condensed and mixed together, making it impossible to separate and recover the oxides of molybdenum and rhenium.

[0005] Based on this, the utility model designs a molybdenum concentrate roasting device to solve the problems raised in the above background technology. Utility Model Content

[0006] The purpose of the utility model is to provide a molybdenum concentrate roasting device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a molybdenum concentrate roasting device, comprising an electric furnace support and a roasting furnace fixedly connected to the electric furnace support, the bottom side of the roasting furnace is connected to a preheating furnace through a furnace pipe, the air inlet end of the preheating furnace is connected to a blower, the top side of the roasting furnace is connected to a feeder through a feed pipe, the top of the roasting furnace is connected to a molybdenum reaction product collector through a collecting pipe, the top side of the molybdenum reaction product collector is connected to a rhenium reaction product collector through a connecting pipe, and the top of the rhenium reaction product collector is connected to a waste gas pipe. The collecting pipe is connected to a cyclone dust collector, the top of the cyclone dust collector is connected to a desulfurization tank through a pipeline, the top side of the desulfurization tank is connected to a centrifugal fan through a pipeline, the outer periphery of the collecting pipe and the connecting pipe is equipped with a cooler, the top inner cavity of the molybdenum reaction product collector and the rhenium reaction product collector is provided with a temperature control chamber, the temperature control chamber is installed with a thermometer and a resistance heating sleeve, and the temperature measuring probe of the thermometer is arranged near the end of the gas path of the collecting pipe and the connecting pipe, and the heating end of the resistance heating sleeve is mounted on the inner side of the end of the gas path of the collecting pipe and the connecting pipe.

[0008] Preferably, the top inner walls of the molybdenum reaction product collector and the rhenium reaction product collector are both paved with insulation plates.

[0009] Preferably, the cooler adopts a spiral copper tube, and an electromagnetic regulating valve is installed at the water inlet end of the cooler.

[0010] Preferably, the roasting furnace is a tubular furnace, and is composed of a furnace body, a furnace liner, an insulation layer and a heating element. The insulation layer is built between the inner wall of the furnace body and the outer wall of the furnace liner, and the heating element is arranged inside the furnace liner.

[0011] Preferably, the furnace liner is made of ceramic crystal fiber, the insulation layer is built with ultra-lightweight insulation bricks made of hollow alumina balls, and the heating element is made of high-temperature alloy resistance wire wound into a spiral shape and arranged in the furnace.

[0012] Preferably, the feeder is a micro screw powder feeder, and the feeder is installed on one side of the top end of the electric furnace support through a fixed support.

[0013] Preferably, two ash discharge ports are symmetrically provided on both sides of the bottom end of the roasting furnace.

[0014] Preferably, the electric furnace support is made of steel sections, round steel, and anti-slip steel plates, and includes a working platform, a ladder, and a guardrail.

[0015] Compared with the prior art, the utility model provides a molybdenum concentrate roasting device, which has the following beneficial effects:

[0016] (1) The utility model has a simple structure and is easy to operate. The preheating furnace and the blower are used to preheat the reaction air, so that the temperature in the roasting furnace can be quickly reached, thereby improving the roasting speed and efficiency.

[0017] (2) The utility model can cool down the reaction products and precisely control the temperature of the volatile gas after cooling by setting up a molybdenum reaction product collector and a rhenium reaction product collector, as well as a cooler, a temperature meter and a resistance heating sleeve on the gas path of the reaction products. When the volatile gas cools down too quickly, which is not conducive to the condensation of molybdenum and rhenium, a heating resistance heating sleeve can be used to keep the volatile gas warm and heat it; at the same time, the cooling speed can be controlled by adjusting the flow rate of condensed water passing through the cooler, so that the MoO in the volatile product is 3 and Re 2 O 7 The corresponding desublimation temperatures are reached in the molybdenum reaction product collector and the rhenium reaction product collector respectively, so that the temperature can be accurately controlled to produce different reaction products (MoO 3 and Re 2 O 7 ) for classified collection, thus realizing the classified collection of reaction products during the roasting process of molybdenum concentrate;

[0018] (3) The utility model is equipped with a cyclone dust collector and a desulfurization tank, which can remove dust and desulfurize the exhaust gas generated in the roasting furnace and then discharge it into the atmosphere, which has a good dust removal and purification effect and can effectively prevent pollution to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic structural diagram of the overall side of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the overall top of the utility model;

[0022] Figure 4 It is a schematic diagram of the internal structure of the molybdenum reaction product collector or the rhenium reaction product collector of the utility model;

[0023] Figure 5 It is a schematic diagram of the structure inside the roasting furnace of the utility model;

[0024] In the figure: 1. Electric furnace support; 11. Working platform; 12. Ladder; 13. Guardrail; 2. Roasting furnace; 21. Furnace tube; 22. Furnace body; 23. Furnace liner; 24. Insulation layer; 25. Heating element; 26. Ash discharge port; 3. Preheating furnace; 4. Blower; 5. Feeder; 51. Feed pipe; 52. Fixed support; 6. Collection pipeline; 61. Molybdenum reaction product collector; 62. Rhenium reaction product collector; 63. Connecting pipeline; 64. Cooler; 65. Temperature control room; 651. Thermometer; 652. Resistance heating sleeve; 66. Insulation board; 7. Cyclone dust collector; 71. Exhaust gas pipeline; 8. Desulfurization tank; 9. Centrifugal fan. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Example

[0026] like Figure 1-Figure 5As shown, the utility model provides a molybdenum concentrate roasting device, including an electric furnace support 1 and a roasting furnace 2 fixedly connected to the electric furnace support 1, a bottom side of the roasting furnace 2 is connected to a preheating furnace 3 through a furnace pipe 21, an air inlet end of the preheating furnace 3 is connected to a blower 4, the preheating furnace 3 preheats the reaction air so that the roasting furnace 2 can quickly reach the required temperature in the furnace, a top side of the roasting furnace 2 is connected to a feeder 5 through a feed pipe 51, which is convenient for adding molybdenum sulfide bulk materials into the roasting furnace 2, and the top of the roasting furnace 2 is connected to a molybdenum reaction product collector 61 through a collecting pipe 6, and the molybdenum reaction product collector 61 is connected to the molybdenum reaction product collector 61. The top side of the molybdenum reaction product collector 61 is connected to the rhenium reaction product collector 62 through a connecting pipe 63. The reaction product with a high desublimation temperature can be first collected through the molybdenum reaction product collector 61. At this time, the molybdenum reaction product is first solidified and collected, and then the reaction product with a low desublimation temperature is collected through the rhenium reaction product collector 62. At this time, the rhenium reaction product can be solidified and collected. The top of the rhenium reaction product collector 62 is connected to the cyclone dust collector 7 through an exhaust gas pipeline 71. The top of the cyclone dust collector 7 is connected to the desulfurization tank 8 through a pipeline. The top side of the desulfurization tank 8 is connected to the centrifugal fan 9 through a pipeline. After being purified by the cyclone dust collector 7 and the desulfurization tank 8, the gas is discharged to the atmosphere through the centrifugal fan 9. The outer periphery of the collecting pipe 6 and the connecting pipe 63 is equipped with a cooler 64. The top inner cavity of the molybdenum reaction product collector 61 and the rhenium reaction product collector 62 is equipped with a temperature control chamber 65. The temperature control chamber 65 is installed with a thermometer 651 and a resistance heating sleeve 652. The temperature probe of the thermometer 651 is set at the end of the gas path close to the collecting pipe 6 and the connecting pipe 63. The heating end of the resistance heating sleeve 652 is set on the inner side of the gas path end of the collecting pipe 6 and the connecting pipe 63. The cooler 64 can cool the reaction products quickly and accurately measure the temperature of the cooled gas through the thermometer 651. When the gas cools down too quickly, which is not conducive to the condensation of molybdenum and rhenium respectively, the heating resistor heating sleeve 652 is used to heat the gas to reach the corresponding condensation temperature. At the same time, the temperature drop is controlled by adjusting the flow rate of condensed water passing through the cooler 64. In this way, the molybdenum reaction products and rhenium reaction products produced by the roasting of molybdenum concentrate can be collected according to different degrees of cooling and precise temperature control, thereby realizing the classified collection of reaction products in the roasting process of molybdenum concentrate.

[0027] It should be noted that the molybdenum and rhenium oxides volatilized from the molybdenum concentrate after high-temperature roasting sublimate at different temperatures. After volatilization, molybdenum trioxide sublimates at 700-750°C, and rhenium heptoxide sublimates at 300°C.

[0028] In a preferred embodiment, Figure 3 and Figure 4As shown, the top inner walls of the molybdenum reaction product collector 61 and the rhenium reaction product collector 62 are both paved with an insulation board 66. Specifically, the insulation board 66 is made of a rock wool insulation board or a calcium silicate insulation board, etc., which has excellent insulation performance and can insulate the gas reaction products in the molybdenum reaction product collector 61 and the rhenium reaction product collector 62, thereby ensuring the temperature stability during gas condensation and achieving the effect of precise temperature control.

[0029] In a preferred embodiment, Figure 1-Figure 4 As shown, the cooler 64 adopts a spiral tube cooler, and an electromagnetic regulating valve is installed at the water inlet end of the cooler 64. When in use, cold water flows through the cooler 64 to take away the heat to achieve cooling. The high-temperature reaction products volatilized after roasting can be accelerated to cool down under the action of the cooler 10 when they pass through the collecting pipe 6 and the connecting pipe 63 in turn. The electromagnetic regulating valve can be used to adjust the flow rate of condensed water to control the temperature drop rate.

[0030] It should be noted that the cooler 64, the thermometer 651 and the resistance heating sleeve 652 use a matching electronic control system, which can realize the functions of automatic control of cooling, temperature measurement and heating, ensuring that the gas temperature in the molybdenum reaction product collector 61 is within 700-750°C and the gas temperature in the rhenium reaction product collector 62 is below 300°C (including 300°C).

[0031] In a preferred embodiment, Figure 1 and Figure 5 As shown, the roasting furnace 2 adopts a tubular furnace, and is composed of a furnace body 22, a furnace liner 23, an insulation layer 24 and a heating element 25. The insulation layer 24 is built between the inner wall of the furnace body 22 and the outer wall of the furnace liner 23, and the heating element 25 is arranged inside the furnace liner 23.

[0032] Furthermore, the furnace liner 23 is made of ceramic crystal fiber, and the insulation layer 24 is built with ultra-light insulation bricks made of hollow alumina balls. It has good insulation effect and low temperature of the outer wall of the furnace. The heating element 25 is wound into a spiral shape with a high-temperature alloy resistance wire and arranged in the furnace. The resistance wire has a low surface load design and a long service life. Specifically, the furnace liner 23 is made of ceramic crystal fiber produced by Shanghai Aesop. The ceramic fiber is vacuum sintered and formed. The temperature can reach 1400 degrees. It has a high insulation coefficient and the furnace is tightly closed and sealed without air leakage.

[0033] It should be noted that the temperature control method of roasting furnace 2 adopts Shanghai Guolong PID intelligent microcomputer program temperature control instrument TCW-32B and Ximanton power module phase shift control, the temperature control accuracy can reach ±1°C, and the furnace temperature uniformity can reach ±5°C.

[0034] In a preferred embodiment, Figure 1-Figure 3As shown, the feeder 5 adopts a micro-screw powder feeder, and the feeder 5 is installed on the top side of the electric furnace support 1 through a fixed bracket 52. Specifically, the feeding capacity of the feeder 5 is 30L / h, the silo volume is 50L, the powder feeding amount of the micro-screw powder feeder is 50-100Kg / h adjustable, the powder feeding amount is stable, and the connecting pipe is connected by a stainless steel bellows.

[0035] In a preferred embodiment, Figure 5 As shown, two ash discharge ports 26 are symmetrically provided on both sides of the bottom of the roasting furnace 2. Specifically, a valve is provided on the two ash discharge ports 26, which are closed during roasting and discharged after the reaction is completed, so as to facilitate the discharge of ash.

[0036] In a preferred embodiment, Figure 1-Figure 3 As shown, the electric furnace support 1 is made of steel, round steel, and anti-slip steel plate, and includes a working platform 11, a ladder 12, and a guardrail 13. The electric furnace support 1 is welded according to the height of the roasting furnace 2 and the experimental needs, and complies with the requirements of the "Steel Structure Design Code" (GB50017-2003). Its structure is firm, safe and reliable.

[0037] Working principle: In actual use, the gas source is generated by a micro-blower, and passes through a ball valve, a glass rotor flowmeter, and then enters the preheating furnace 3 through the blower 4. After being heated to 600°C, it enters the lower port of the furnace tube 21 at the bottom of the furnace of the roasting furnace 2. The gas source enters the roasting furnace 2 through the air inlet at the bottom of the furnace tube 21. Then the feeder 5 adds the molybdenum concentrate into the roasting furnace 2 through the feed pipe 51 for roasting. Then the roasted gas reaction product (the temperature can reach 1000°C) enters the top of the inner side of the molybdenum reaction product collector 61 through the collecting pipe 6. First, it is cooled for the first time through the cooler 64 thereon, and then the temperature of the cooled gas is measured by the thermometer 651. When the gas temperature drops too fast (the gas temperature is lower than 700°C), which is not conducive to the condensation of molybdenum and rhenium respectively, a heating resistor heating sleeve 652 is used. The gas is heated to reach the corresponding desublimation temperature (700-750°C), and the temperature drop rate is controlled by adjusting the condensed water flow rate passing through the cooler 64, so that the gas temperature inside the molybdenum reaction product collector 61 is stably maintained at 700-750°C, ensuring the temperature stability during gas desublimation, and realizing the desublimation collection of molybdenum trioxide after volatilization. Then, the gas reaction product with a lower temperature enters the top of the inner cavity of the rhenium reaction product collector 62 through the connecting pipe 63. Similar to the collection principle of the above-mentioned molybdenum reaction product collector 61, after molybdenum desublimates, the temperature can be accelerated to 300°C to allow rhenium to desublimate, and the desublimation collection of rhenium heptoxide after volatilization can be realized. Therefore, different reaction products (MoO 3 and Re 2 O 7) for collection, the waste gas generated enters the cyclone dust collector 7 through the waste gas pipe 71 for dust removal, and then enters the desulfurization tank 8 for desulfurization treatment, and finally is discharged to the atmosphere through the centrifugal fan 9.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. Molybdenum concentrate roasting device, characterized by: The invention comprises an electric furnace support (1) and a roasting furnace (2) fixedly connected to the electric furnace support (1); the bottom side of the roasting furnace (2) is connected to a preheating furnace (3) via a furnace pipe (21); the air inlet end of the preheating furnace (3) is connected to a blower (4); the top side of the roasting furnace (2) is connected to a feeder (5) via a feed pipe (51); the top of the roasting furnace (2) is connected to a molybdenum reaction product collector (61) via a collecting pipe (6); the top side of the molybdenum reaction product collector (61) is connected to a rhenium reaction product collector (62) via a connecting pipe (63); the top of the rhenium reaction product collector (62) is connected to a cyclone dust collector (7) via an exhaust gas pipe (71); the cyclone dust collector The top of the desulfurization tank (7) is connected to a desulfurization tank (8) through a pipeline, and the top side of the desulfurization tank (8) is connected to a centrifugal fan (9) through a pipeline. The outer periphery of the collecting pipe (6) and the connecting pipe (63) is provided with a cooler (64). The top inner cavity of the molybdenum reaction product collector (61) and the rhenium reaction product collector (62) is provided with a temperature control chamber (65). The temperature control chamber (65) is installed with a temperature measuring instrument (651) and a resistance heating sleeve (652). The temperature measuring probe of the temperature measuring instrument (651) is arranged near the gas path end of the collecting pipe (6) and the connecting pipe (63), and the heating end of the resistance heating sleeve (652) is sleeved on the inner side of the gas path end of the collecting pipe (6) and the connecting pipe (63).

2. The molybdenum concentrate roasting device according to claim 1, characterized in that: The top inner walls of the molybdenum reaction product collector (61) and the rhenium reaction product collector (62) are both paved with a heat insulation plate (66).

3. The molybdenum concentrate roasting device according to claim 1, characterized in that: The cooler (64) is a spiral tube cooler, and a solenoid regulating valve is installed at the water inlet end of the cooler (64).

4. The molybdenum concentrate roasting device according to claim 1, characterized in that: The roasting furnace (2) is a tubular furnace and is composed of a furnace body (22), a furnace inner shell (23), a heat-insulating layer (24), and a heating element (25); the heat-insulating layer (24) is built between the inner wall of the furnace body (22) and the outer wall of the furnace inner shell (23); and the heating element (25) is arranged inside the furnace inner shell (23).

5. The molybdenum concentrate roasting device according to claim 4, characterized in that: The furnace liner (23) is made of ceramic crystal fibers, the insulation layer (24) is built with ultra-lightweight insulation bricks made of hollow alumina balls, and the heating element (25) is made of high-temperature alloy resistance wire wound into a spiral shape and arranged in the furnace.

6. The molybdenum concentrate roasting device according to claim 1, characterized in that: The feeder (5) is a micro screw powder feeder, and the feeder (5) is mounted on one side of the top end of the electric furnace support (1) via a fixed support (52).

7. The molybdenum concentrate roasting device according to claim 4, characterized in that: Two ash discharge ports (26) are symmetrically arranged on both sides of the bottom end of the roasting furnace (2).

8. The molybdenum concentrate roasting device according to claim 1, characterized in that: The electric furnace support (1) comprises a working platform (11), a ladder (12) and a guardrail (13).

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