Two-in-one high-efficiency energy-saving reaction kiln for converting beta crystal into alpha crystal drying and calcining of zinc sulfide

Abstract

The utility model discloses a two-in-one efficient energy-saving reaction kiln for drying and calcining zinc sulfide by converting beta crystal into alpha crystal, which relates to the technical field of zinc sulfide crystal conversion facilities and comprises a rotary barrel body, a discharge port, a drying section, a crystal section, a wedge-shaped acid-resistant material brick layer, a high-alumina brick layer, a heat radiation barrel, a shaftless screw feeder, a tail gas exhaust port, a combustion chamber and the like. According to the zinc sulfide beta crystal transformation device, zinc sulfide beta crystals can be dried and then calcined, the zinc sulfide beta crystal transformation operation is continuously completed, and compared with traditional double-kiln operation, the zinc sulfide beta crystal transformation device has the advantages of saving energy and improving the rate of superior products of finished products.

Description

TECHNICAL FIELD

[0001] The utility model relates to a zinc sulfide crystal transformation facility technical field, specifically is a kind of zinc sulfide beta crystal transforms alpha crystal drying and calcination two-in-one high-efficiency energy-saving reaction kiln. BACKGROUND

[0002] Due to production needs, when our company carries out high-purity industrial zinc sulfide production process, it needs to convert the beta crystal form of zinc sulfide into alpha crystal form, and the method adopted is to purchase existing kiln, first dry the beta crystal form of zinc sulfide through drying kiln, then transport the dried beta crystal form of zinc sulfide after drying to rotary kiln for calcination and crystal transformation. It is found through long-term production that rotary kiln has a lot of heat when calcining, and drying kiln also needs heat to dry. Therefore, technical personnel propose to combine drying kiln and rotary kiln into a two-in-one reaction kiln, in order to achieve the effect of energy saving, and thus reduce production cost. CONTENT OF UTILITY MODEL

[0003] A kind of zinc sulfide beta crystal transforms alpha crystal drying and calcination two-in-one high-efficiency energy-saving reaction kiln, including rotary barrel body, one end of the rotary barrel body is feed end, and feed end is provided with shaftless feeding screw, the other end of the rotary barrel body is discharge end, and discharge end is provided with the discharge port of spiral sealing discharge;Rotary barrel body is set to decline 4.5-5.5 ° to discharge port;The length of rotary barrel body is 50-70m, and is divided into drying section close to feed port and calcination and crystal transformation section close to discharge port, the length of drying section is 3 / 4 of rotary barrel body, and the length of calcination and crystal transformation section is 1 / 4 of rotary barrel body;Drying section includes wedge-shaped acid-resistant material brick layer;The calcination and crystal transformation section includes high-alumina brick layer and is equipped with heat radiation barrel of stainless steel material on the inner side;Every 2m in the calcination and crystal transformation section and every 3m in drying section are provided with temperature measuring thermocouple;The feed end is also provided with tail gas exhaust port;The discharge end is also provided with combustion chamber.

[0004] In the foregoing zinc sulfide beta crystal transforms alpha crystal drying and calcination two-in-one high-efficiency energy-saving reaction kiln, the rotary barrel body is set to decline 5 ° to discharge port.

[0005] In the foregoing zinc sulfide beta crystal transforms alpha crystal drying and calcination two-in-one high-efficiency energy-saving reaction kiln, the diameter of the whole body is 2-5-3.5m.

[0006] In the foregoing zinc sulfide beta crystal transforms alpha crystal drying and calcination two-in-one high-efficiency energy-saving reaction kiln, the length of the rotary barrel body is 60m.

[0007] In the foregoing zinc sulfide beta crystal transforms alpha crystal drying and calcination two-in-one high-efficiency energy-saving reaction kiln, the material of the heat radiation barrel is 310S stainless steel.

[0008] The inner spiral material guide plate and the shell are made of 316L stainless steel.

[0009] The temperature measuring thermocouple is a platinum-rhodium-platinum temperature measuring thermocouple.

[0010] The wedge-shaped acid-resistant material brick layer and the high-aluminum brick layer have a lining thickness of 230 mm.

[0011] The zinc sulfide beta crystal to alpha crystal drying and calcining two-in-one high-efficiency energy-saving reaction kiln can dry the beta crystal type zinc sulfide first, and then calcine to complete the calcining beta crystal type zinc sulfide crystal conversion operation without interruption, and compared with the traditional double-kiln technology, the zinc sulfide beta crystal to alpha crystal drying and calcining two-in-one high-efficiency energy-saving reaction kiln has the advantages of energy saving and improving the finished product superior rate. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the utility model;

[0013] Figure 2 It is Figure 1 It is an enlarged schematic view of the structure of the middle circular region;

[0014] Reference signs: 1-rotary barrel; 2-discharge port; 3-drying section; 4-calcining crystal conversion section; 5-wedge-shaped acid-resistant material brick layer; 6-high-aluminum brick layer; 7-heat radiation barrel; 8-axleless feeding screw; 9-tail gas exhaust; 10-combustion chamber. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0016] Embodiment, a zinc sulfide beta crystal to alpha crystal drying and calcining two-in-one high-efficiency energy-saving reaction kiln, the reaction kiln utilizes the structure of the existing calcining rotary kiln, and is innovated and transformed on the basis thereof, and the transformation structure is referred to Figures 1-2 The rest of the structures not specifically introduced and the structures in the existing rotary kiln are similar, and the specific transformation structure includes:

[0017] The diameter of the rotary barrel 1 is set to 3 m and the length is set to 60 meters, one end of the rotary barrel 1 is reserved as a feeding end, the axleless feeding screw 8 is additionally arranged at the feeding end, so that feeding is facilitated; the other end of the rotary barrel 1 is reserved as a discharge end, and the discharge end is provided with the spiral sealing discharge discharge port 2, so that discharging is facilitated.

[0018] The rotary barrel 1 is divided into a drying section 3 close to the feeding port 1 and a calcination and crystal transformation section 4 close to the discharging port. The length of the drying section 3 is 45 m, and the drying section 3 is used to retain the heat conducted from the calcination and crystal transformation section as much as possible, so as to effectively dry the β crystal zinc sulfide. The length of the calcination and crystal transformation section 4 is 15 m, and the calcination and crystal transformation section 4 is used to calcine and transform the crystal of the dried β crystal zinc sulfide.

[0019] The rotary barrel 1 is inclined downward by 5° towards the discharging port 2, and the zinc sulfide is conveniently discharged along with the rotation of the rotary barrel 1.

[0020] The discharging end is further provided with a combustion chamber 10, which is used to provide heat for the calcination and crystal transformation section 4. The calcination and crystal transformation section 4 comprises a high-alumina brick layer 6 and is internally provided with a heat radiation barrel 7 made of stainless steel. The heat radiation barrel 7 has good heat conduction performance, so that the temperature in the calcination and crystal transformation section 4 can be quickly conducted, and the temperature of each heat radiation barrel 7 can be uniformly reached to a predetermined temperature, so as to calcine the zinc sulfide by the temperature. The feeding end is further provided with a tail gas discharge port 9, and the tail gas is finally discharged from the tail gas discharge port 9.

[0021] In terms of material, in order to guarantee the heat resistance and acid resistance of the kiln body, the drying section 3 needs to resist high temperature of 500℃, and the drying section 3 comprises a wedge-shaped acid-resistant material brick layer 5 with a lining thickness of 230 mm. The calcination and crystal transformation section 4 needs to resist high temperature of 1000℃, and the calcination and crystal transformation section 4 comprises a high-alumina brick layer 6 with a lining thickness of 230 mm. In order to provide better heat conduction effect, the heat radiation barrel 7 is made of 310S stainless steel. The rotary barrel 1 comprises an inner spiral material guide plate and an outer shell, and the material of the inner spiral material guide plate and the outer shell is 316L stainless steel.

[0022] In terms of temperature control, a temperature measuring thermocouple is arranged every 2 m in the calcination and crystal transformation section 4 and every 3 m in the drying section 3. The temperature measuring thermocouple is preferably a platinum-rhodium-platinum temperature measuring thermocouple. The temperature range of the temperature measuring thermocouple in the calcination and crystal transformation section 4 is 0-1000℃, and the temperature range of the temperature measuring thermocouple in the drying section 3 is 0-500℃. The temperature measured by the temperature measuring thermocouple is fed back to the control system, and then the combustion intensity of the combustion chamber 10 is adjusted and controlled.

[0023] The working principle of the reaction kiln is basically the same as that of the existing rotary kiln. The rotary barrel 1 is driven to rotate. The temperature in the rotary barrel 1 is raised to about 700 DEG C in the calcination and crystal transformation section 4 and about 400 DEG C in the drying section 3 through the combustion chamber 10. The beta crystal zinc sulfide is fed into the drying section 3 of the rotary barrel 1 through the shaftless feeding screw 8. With the rotation of the rotary barrel 1 and the guidance of the inner spiral guide plate, the zinc sulfide entering the inner spiral guide plate can move towards the discharge port 2. The rotation speed of the rotary barrel 1 is controlled so that the feeding time through the calcination and crystal transformation section 4 is 1.5 h and the feeding time through the drying section 3 is 4.5 h. In this way, the beta crystal zinc sulfide is dried first and then calcined and crystal transformed in the same facility. According to the calculation, compared with the double-kiln operation mode of first processing in the drying kiln and then processing in the rotary kiln, about 25% of energy can be saved. Compared with the traditional double-kiln non-continuous crystal transformation mode, the drying and calcination and crystal transformation of the beta crystal zinc sulfide in the reaction kiln are continuous, and the actual measurement shows that the rate of the superior product is increased by 15%.

[0024] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacement or change according to the technical solution and concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A high-efficiency and energy-saving reaction kiln combining β-crystal to α-crystal drying and calcination of zinc sulfide, comprising a rotary kiln body (1), characterized in that: One end of the rotary barrel (1) is the feeding end, the feeding end is provided with shaftless feeding screw (8), the other end of the rotary barrel (1) is the discharge end, the discharge end is provided with screw sealing discharge discharge port (2); The rotary barrel (1) is inclined to the discharge port (2) by 4.5-5.5°; The length of the rotary barrel (1) is 50-70m, which is divided into drying section (3) near the feeding port and calcination crystallization section (4) near the discharge port (2), the length of the drying section (3) is 3 / 4 of the length of the rotary barrel (1), the length of the calcination crystallization section (4) is 1 / 4 of the length of the rotary barrel (1); The drying section (3) includes wedge-shaped acid-resistant material brick layer (5); The calcination crystallization section includes high alumina brick layer (6) and is provided with heat radiation barrel (7) made of stainless steel on the inner side; The calcination crystallization section (4) is provided with temperature measuring thermocouple every 2m, and the drying section (3) is provided with temperature measuring thermocouple every 3m; The feeding end is also provided with tail gas exhaust port (9); The discharge end is also provided with combustion chamber (10).

2. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β crystal to α crystal according to claim 1, characterized in that: The rotary barrel (1) is inclined to the discharge port (2) by 5°.

3. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β-crystal to α-crystal according to claim 1, characterized in that: The diameter of the rotary barrel (1) is 2-5-3.5m.

4. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β-crystal to α-crystal according to claim 1, characterized in that: The length of the rotary barrel (1) is 60m.

5. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β-crystal to α-crystal according to claim 1, characterized in that: The material of the heat radiation barrel is 310S stainless steel.

6. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β-crystal to α-crystal according to claim 1, characterized in that: The rotary barrel (1) includes inner spiral guide plate and shell, and the material of the inner spiral guide plate and the shell is 316L stainless steel.

7. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β-crystal to α-crystal according to claim 1, characterized in that: The temperature measuring thermocouple is platinum rhodium platinum temperature measuring thermocouple.

8. The dry and calcine two-in-one high efficiency energy saving reaction kiln for converting zinc sulfide β-crystal to α-crystal according to claim 1, characterized in that: The wedge-shaped acid-resistant material brick layer (5) and the high alumina brick layer (6) are 230mm thick.

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