Sponge cadmium reduction smelting furnace

Abstract

The utility model belongs to the technical field of sponge cadmium smelting, and discloses a sponge cadmium reduction smelting furnace which comprises a smelting furnace body, reduction auxiliary materials added into the smelting furnace body and a stirring device used for stirring in the reduction process. The reduction auxiliary material is anthracite fragments; the smelting furnace further comprises an auxiliary material adding device, the auxiliary material adding device comprises a spiral feeder, a material guiding barrel and a material basket, the material guiding barrel is vertically installed at the top of the smelting furnace body, a feeding port is formed in the side wall of the exposed end of the material guiding barrel and connected with a discharging port of the spiral feeder, a discharging port in the bottom of the material guiding barrel is connected with the material basket, and the material basket is used for receiving reduction auxiliary materials. According to the utility model, the anthracite fragments are used as reduction auxiliary materials, the spiral feeder is used for quantitatively adding the anthracite fragments into the material basket, and the material basket is positioned below the metal melt liquid level, so that the anthracite fragments are effectively contacted with the metal melt liquid, and the reduction smelting impurity removal effect of sponge cadmium is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sponge cadmium smelting, in particular to a sponge cadmium reduction smelting furnace. Background Art

[0002] In the cadmium production system, sponge cadmium is mainly used as raw material. Sponge cadmium is easily oxidized into cadmium oxide in the air. Cadmium oxide needs to be reduced to metallic cadmium, and the reduction process is completed in the reduction smelting furnace. In the specific operation: a certain amount of sodium hydroxide is added to the reduction smelting furnace, and the raw material-sponge cadmium is added after the sodium hydroxide is melted. After melting, it is mechanically stirred, and a certain proportion of reduction auxiliary material-coal powder is added at the same time. The surface is covered with molten sodium hydroxide during the reduction process. The role of sodium hydroxide is to isolate oxygen, transfer heat and make slag. In this process, zinc oxide also participates in the thermal reduction of carbon, and Zn remains in the alkaline slag in the form of sodium zincate. The alkaline slag and crude cadmium are discharged successively through different discharge ports. The existing sponge cadmium reduction smelting furnace has the following defects:

[0003] 1. During the smelting process, since the density of the reduced pulverized coal is small while the density and viscosity of the molten cadmium and zinc are large, it is very easy to form a segregation effect in the furnace where the auxiliary materials float up and the molten metal sinks, resulting in unsatisfactory reduction smelting and impurity removal effect of sponge cadmium;

[0004] 2. The reducing coal powder needs to be added manually in a quantitative manner, and there is a problem of insufficient reducing auxiliary materials due to missed addition, which also affects the reduction smelting and impurity removal effect of sponge cadmium.

[0005] Based on this, the present application provides a sponge cadmium reduction smelting furnace to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the technical problems of separation effect between reducing coal powder and molten metal and artificial leakage of adding reducing coal powder in the prior art. To this end, the utility model provides a sponge cadmium reduction smelting furnace.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A sponge cadmium reduction smelting furnace is provided, comprising a smelting furnace body, a reducing auxiliary material added into the smelting furnace body and a stirring device for stirring during the reduction process; the reducing auxiliary material is anthracite fragments; and an auxiliary material adding device is also provided, the auxiliary material adding device comprises a screw feeder, a material guide barrel and a material basket, the material guide barrel is vertically installed on the top of the smelting furnace body, a material feed port is provided on the side wall of the exposed end of the material guide barrel, the material feed port is connected to the material discharge port of the screw feeder, the bottom material discharge port of the material guide barrel is connected to the material basket, and the material basket is used to receive the reducing auxiliary material.

[0009] In a preferred embodiment of the utility model, a pushing screw shaft is rotatably installed in the material guiding cylinder, and the pushing screw shaft is connected to a driving motor installed on the top of the material guiding cylinder.

[0010] In a preferred embodiment of the present utility model, the pushing screw shaft includes a shaft body, a material discharge screw located in the material guide barrel, and a material return screw located in the material basket.

[0011] In a preferred embodiment of the present invention, the material basket is arranged below the molten liquid level in the smelting furnace, and the mesh size thereof is smaller than the particle size of the reducing auxiliary material.

[0012] In a preferred embodiment of the present invention, the material basket is arranged below the molten metal liquid level in the smelting furnace, and the mesh size thereof is smaller than the particle size of the reducing auxiliary material.

[0013] In a preferred embodiment of the present utility model, the material guide cylinder, the material pushing spiral shaft, the material basket and the inner liner of the smelting furnace body are all made of 310S stainless steel.

[0014] In a preferred embodiment of the present invention, the feed port of the screw feeder is connected to a storage hopper, and the storage hopper is used to store reducing auxiliary materials.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model uses anthracite fragments as reduction auxiliary materials, and uses a spiral feeder to quantitatively add anthracite fragments into a material basket, and the material basket is located below the surface of the molten metal, thereby ensuring effective contact between the anthracite fragments and the molten metal, thereby ensuring the reduction smelting and impurity removal effect of sponge cadmium;

[0017] 2. The pushing screw shaft arranged in the material guide cylinder can prevent the material from being blocked; and the part of the pushing screw shaft located in the material basket is provided with a return screw, which can pick up the anthracite fragments in the material basket during the rotation of the pushing screw shaft, which can achieve the stirring effect on the one hand and increase the reaction rate of the anthracite fragments and cadmium oxide on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a cross-sectional view of the sponge cadmium reduction smelting furnace provided by the utility model;

[0020] Figure 2 The utility model is a connection structure diagram of the guide tube and the pushing spiral shaft.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1—melting furnace body, 1.1—raw material feeding port, 1.2—crude cadmium outlet, 1.3—alkali slag outlet, 2—reducing auxiliary materials, 3—stirring device, 4—screw conveyor, 5—auxiliary material feeding device, 5.1—screw feeder, 5.2—material guide cylinder, 5.3—material basket, 6—storage hopper, 7—pushing screw shaft, 7.1—shaft body, 7.2—feeding screw, 7.3—returning screw, 8—driving motor. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model; the terms "install", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] Embodiment 1

[0028] This embodiment provides a sponge cadmium reduction smelting furnace, as shown in the attached Figure 1 As shown, the smelting furnace comprises a smelting furnace body 1, a reducing auxiliary material 2 added into the smelting furnace body, and a stirring device 3 for stirring during the reduction process. Among them, a raw material feeding port 1.1 is provided on the top of the smelting furnace body 1, and the raw material feeding port 1.1 is sealedly connected to a screw conveyor 4, and the raw materials (sponge cadmium and sodium hydroxide) are fed into the smelting furnace by the screw conveyor. The smelting furnace is also provided with a crude cadmium outlet 1.2 and an alkali slag outlet 1.3, which are used to discharge the crude cadmium and the alkali slag respectively.

[0029] Preferably, the reduction auxiliary material 2 in this embodiment is anthracite fragments. Anthracite is commonly known as white coal or red coal. It is the coal with the highest degree of coalification and generally has a carbon content of more than 90%. It can completely replace coal powder to undergo reduction reaction with cadmium liquid, and the reaction effect is better.

[0030] Furthermore, the present embodiment is also provided with an auxiliary material adding device 5, the auxiliary material adding device 5 comprises a screw feeder 5.1, a guide barrel 5.2 and a basket 5.3, the guide barrel 5.2 is vertically installed on the top of the smelting furnace body 1, a feed port is provided on the side wall of the exposed end of the guide barrel 5.2, the feed port is connected to the discharge port of the screw feeder 5.1, the bottom discharge port of the guide barrel 5.2 is connected to the basket 5.3, the basket 5.3 is used to receive the reduction auxiliary material 5, and the basket 5.3 is arranged below the molten metal liquid level in the smelting furnace, and its mesh size is smaller than the particle size of the reduction auxiliary material. The present embodiment uses a screw feeder to quantitatively add anthracite fragments into the basket, and the basket is located below the molten metal liquid level, which ensures the effective contact between the anthracite fragments and the molten metal, thereby ensuring the reduction smelting and impurity removal effect of sponge cadmium.

[0031] Preferably, the feed port of the screw feeder 5.1 is connected to the storage hopper 6, and the storage hopper 6 is used to store the reduction auxiliary material. In this embodiment, the anthracite fragments can be stored in the storage hopper. When the anthracite fragments need to be added, the anthracite fragments can be added in a quantitative proportion according to the input sponge cadmium, and the quantitative feeding function of the screw feeder is used to realize automatic feeding, thereby preventing the leakage of feeding caused by manual feeding.

[0032] Preferably, the material guide barrel 5.2, the material basket 5.3 and the inner liner of the smelting furnace body 1 are all made of 310S stainless steel, which has the characteristics of high heat resistance and ensures the normal operation of the equipment.

[0033] Embodiment 2

[0034] Based on the first embodiment, a push screw shaft 7 is rotatably installed in the guide cylinder 5.2, and the push screw shaft 7 is connected to a drive motor 8 installed on the top of the guide cylinder 5.2. The push screw shaft provided in this embodiment can effectively prevent the guide cylinder from being blocked.

[0035] Preferably, the pushing screw shaft 7 is also made of 310S stainless steel.

[0036] Embodiment 3

[0037] In the airport of the second embodiment, the push screw shaft 7 of this embodiment includes a shaft body 7.1, a material discharge screw 7.2 located in the material guide cylinder 5.2, and a material return screw 7.3 located in the material basket 5.3. In this embodiment, the material return screw is provided at the part of the push screw shaft located in the material basket. During the rotation of the push screw shaft, the anthracite fragments in the material basket can be picked up, which can achieve a stirring effect on the one hand, and can increase the reaction rate of the anthracite fragments and cadmium oxide on the other hand.

[0038] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sponge cadmium reduction smelting furnace, comprising a smelting furnace body, a reduction auxiliary material added into the smelting furnace body, and a stirring device for stirring during the reduction process; characterized in that: The reducing auxiliary material is anthracite fragments; It also includes an auxiliary material adding device, which includes a screw feeder, a guide barrel and a material basket. The guide barrel is vertically installed on the top of the smelting furnace body. A feed port is provided on the side wall of the exposed end of the guide barrel. The feed port is connected to the discharge port of the screw feeder. The bottom discharge port of the guide barrel is connected to the material basket, and the material basket is used to receive reducing auxiliary materials.

2. The sponge cadmium reduction smelting furnace according to claim 1, characterized in that: A material pushing screw shaft is rotatably installed in the material guiding cylinder, and the material pushing screw shaft is connected to a driving motor installed on the top of the material guiding cylinder.

3. The sponge cadmium reduction smelting furnace according to claim 2, characterized in that: The pushing screw shaft comprises a shaft body, a material discharging screw located in a material guiding cylinder and a material returning screw located in a material basket.

4. The sponge cadmium reduction smelting furnace according to claim 3, characterized in that: The material basket is arranged below the molten metal liquid level in the smelting furnace, and the mesh size of the material basket is smaller than the particle size of the reducing auxiliary material.

5. The sponge cadmium reduction smelting furnace according to claim 2, characterized in that: The material guide barrel, the material pushing spiral shaft, the material basket and the inner liner of the smelting furnace body are all made of 310S stainless steel.

6. The sponge cadmium reduction smelting furnace according to any one of claims 1 to 5, characterized in that: The feed port of the screw feeder is connected to a storage hopper, and the storage hopper is used to store reducing auxiliary materials.

Images