System for preparing chromium sesquioxide from chromium-containing waste

Abstract

The utility model relates to the technical field of chromium-containing waste treatment, in particular to a system for preparing chromium sesquioxide from chromium-containing waste, which comprises a furnace body, a stainless steel inner container is fixed at the top in the furnace body through bolts, a combustion chamber is arranged in the furnace body at the bottom of a filter pressing component, and the filter pressing component is arranged at the top of the furnace body. The filter pressing assembly comprises an electric hydraulic cylinder mounted at the top of the furnace body through a mounting frame, and an output shaft, located in the stainless steel inner container, of the electric hydraulic cylinder is fixedly provided with a pressing plate through a flange; the electric hydraulic cylinder pushes the pressing plate to move downwards, water-soluble hexavalent chromium in the stainless steel inner container can be leached through the pressing plate and the filter screen, the infusion pump works to pump out leached liquid-phase chromium through the water inlet pipe and the telescopic pipe, fuel enters the combustion cavity through the feeding pipe and is ignited through the electronic igniter, and then the fuel is combusted. The device can be used for roasting chromium-containing waste and chromium hydroxide in the stainless steel inner container, and can complete most steps of preparing chromium sesquioxide from the chromium-containing waste.

Description

Technical Field

[0001] The utility model relates to the technical field of chromium-containing waste treatment, in particular to a system for preparing chromium trioxide from chromium-containing waste. Background Art

[0002] Chromium has excellent properties such as hardness, brittleness and corrosion resistance, so it is widely used in metallurgy, chemical industry, cast iron, refractory and high-precision technology. Chromium-containing waste is a kind of highly toxic and carcinogenic hazardous waste, which is mainly produced in chemical industry (chromium compound production), metallurgy (ferrochrome alloy), light industry (electroplating, tanning, dyes, pigments) and other production processes. The recovery and harmless disposal of chromium in chromium-containing waste is of great significance to environmental governance and resource recycling.

[0003] The prior art uses roasting, water immersion, hydrolysis, reduction, filtration and other steps to prepare chromium-containing waste into chromium trioxide. In order to complete the above steps, equipment such as a rotary kiln, a plate and frame filter press, and a reactor are required, and it is impossible to complete them on a single device. Therefore, a system for preparing chromium trioxide from chromium-containing waste is proposed, in which roasting, filtration and other structures are added to the furnace body, and a single device can prepare chromium trioxide from chromium-containing waste. Utility Model Content

[0004] In view of the problems in the prior art, the utility model provides a system for preparing chromium trioxide from chromium-containing wastes, by adding structures such as roasting and filter pressing to a furnace body, so that chromium-containing wastes can be prepared into chromium trioxide using a single device.

[0005] The technical solution adopted by the utility model to solve the technical problem is a system for preparing chromium trioxide from chromium-containing waste, comprising a furnace body, a stainless steel inner tank is fixed to the top of the furnace body by bolts, a combustion chamber is opened inside the furnace body at the bottom of the filter press assembly, a filter press assembly is arranged on the top of the furnace body, the filter press assembly comprises an electric hydraulic cylinder installed on the top of the furnace body through a mounting frame, the output shaft of the electric hydraulic cylinder located inside the stainless steel inner tank is fixed with a pressure plate through a flange, and a filter screen is fixed to the bottom of the pressure plate by bolts;

[0006] A liquid pumping assembly is provided at the top of the furnace body on one side of the electric hydraulic cylinder. The liquid pumping assembly includes a liquid pump installed at one end of the top of the furnace body through a mounting frame. The liquid inlet end of the liquid pump is connected to a water inlet pipe through a pipe joint, and a telescopic tube is fixed to the bottom end of the water inlet pipe through a clamp.

[0007] By adopting the above technical solution, the electric hydraulic cylinder pushes the pressure plate downward, and the water-soluble hexavalent chromium in the stainless steel inner tank can be leached through the pressure plate and the filter screen. The liquid pump can extract the leached liquid phase chromium through the water inlet pipe and the telescopic pipe.

[0008] Specifically, the bottom end of the telescopic tube is connected to the top of the pressing plate through a pipe joint, a liquid inlet is opened at one end of the telescopic tube, and a liquid outlet pipe is fixed to the liquid outlet end of the liquid pump through a clamp.

[0009] Specifically, through holes are equidistantly formed inside the pressure plate.

[0010] Specifically, an inlet and outlet are provided on one side of the furnace body, a feed pipe is fixed to one end of the furnace body at the bottom of the inlet and outlet through a flange, and one end of the feed pipe is connected to a valve through a threaded groove.

[0011] Specifically, an electronic igniter is installed at one end of the furnace body through a mounting seat, and the ignition end of the electronic igniter is located inside the combustion chamber of the furnace body. A temperature sensor is installed at one end of the furnace body located on the top of the electronic igniter through a mounting seat, and the detection end of the temperature sensor is located inside the stainless steel inner tank.

[0012] Specifically, a liquid inlet pipe is fixed to one end of the furnace body via a flange, and a liquid discharge pipe is fixed to one end of the furnace body located at the bottom of the liquid inlet pipe via a flange.

[0013] Beneficial effects of the utility model:

[0014] (1) The utility model discloses a system for preparing chromium trioxide from chromium-containing waste. The electric hydraulic cylinder is turned on to push the pressure plate downward. The pressure plate moves downward to leach the water-soluble hexavalent chromium through the filter screen and the through hole.

[0015] (2) In the system for preparing chromium trioxide from chromium-containing waste described in the utility model, the fuel burns in the combustion chamber to roast the chromium-containing waste and chromium hydroxide in the stainless steel inner tank, and the liquid extraction pump can extract the liquid in the stainless steel inner tank through the water inlet pipe and the telescopic pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the furnace body of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the liquid pumping component of the utility model;

[0020] Figure 4 This is a schematic diagram of the feed pipe structure of the utility model;

[0021] In the figure: 1. furnace body; 2. filter press assembly; 201. electric hydraulic cylinder; 202. pressure plate; 203. filter screen; 204. through hole; 3. liquid extraction assembly; 301. liquid extraction pump; 302. water inlet pipe; 303. telescopic pipe; 304. liquid inlet; 305. liquid outlet pipe; 4. feed pipe; 5. inlet and outlet; 6. drain pipe; 7. liquid inlet pipe; 8. electronic igniter; 9. temperature sensor; 10. valve; 11. combustion chamber; 12. stainless steel liner. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] By adding the roasting and filter pressing structures to the furnace body, a single device can prepare chromium-containing waste into chromium trioxide, such as Figure 1-4 As shown, a system for preparing chromium trioxide from chromium-containing wastes described in the utility model comprises a furnace body 1, a stainless steel inner tank 12 is fixed to the top of the furnace body 1 by bolts, a combustion chamber 11 is opened inside the furnace body 1 at the bottom of the filter press assembly 2, a filter press assembly 2 is arranged on the top of the furnace body 1, and the filter press assembly 2 comprises an electric hydraulic cylinder 201 installed on the top of the furnace body 1 through a mounting frame, the output shaft of the electric hydraulic cylinder 201 located inside the stainless steel inner tank 12 is fixed with a pressure plate 202 through a flange, and a filter screen 203 is fixed to the bottom of the pressure plate 202 by bolts;

[0024] A liquid pumping assembly 3 is provided at the top of the furnace body 1 on one side of the electric hydraulic cylinder 201. The liquid pumping assembly 3 includes a liquid pump 301 installed on one end of the top of the furnace body 1 through a mounting frame. The liquid inlet end of the liquid pump 301 is connected to a water inlet pipe 302 through a pipe joint, and a telescopic tube 303 is fixed to the bottom end of the water inlet pipe 302 through a clamp.

[0025] When in use, the electric hydraulic cylinder 201 pushes the pressure plate 202 downward, and the water-soluble hexavalent chromium in the stainless steel inner tank 12 can be leached through the pressure plate 202 and the filter screen 203. The liquid pump 301 can extract the leached liquid phase chromium through the water inlet pipe 302 and the telescopic pipe 303.

[0026] For example, Figure 3 As shown, the utility model also includes that the bottom end of the telescopic tube 303 is connected to the top of the pressure plate 202 through a pipe joint, one end of the telescopic tube 303 is provided with a liquid inlet 304, and the liquid outlet end of the liquid pump 301 is fixed with a liquid outlet pipe 305 through a clamp.

[0027] When in use, the arrangement of the telescopic tube 303 allows the pressure plate 202 to move up and down without affecting the extraction of liquid from the stainless steel liner 12 by the liquid extraction pump 301 , and the liquid extracted by the liquid extraction pump 301 is discharged through the liquid outlet pipe 305 .

[0028] For example, Figure 4 As shown, the utility model also includes that through holes 204 are equidistantly opened inside the pressing plate 202 .

[0029] When in use, when the pressing plate 202 squeezes the water-soluble hexavalent chromium, the liquid chromium is squeezed onto the pressing plate 202 through the plurality of through holes 204 .

[0030] For example, Figure 1 As shown, the utility model also includes that an inlet and outlet 5 is provided on one side of the furnace body 1, a feed pipe 4 is fixed to one end of the furnace body 1 at the bottom of the inlet and outlet 5 through a flange, and one end of the feed pipe 4 is connected to a valve 10 through a threaded groove.

[0031] When in use, the inlet and outlet 5 are set to facilitate personnel to pour chromium-containing waste into the stainless steel inner tank 12, and to facilitate personnel to take out the slag in the stainless steel inner tank 12, and open the valve 10 to allow external fuel to enter the feed pipe 4 into the combustion chamber 11.

[0032] For example, Figure 1 As shown, the utility model also includes that an electronic igniter 8 is installed at one end of the furnace body 1 through a mounting seat, and the ignition end of the electronic igniter 8 is located inside the combustion chamber 11 of the furnace body 1. A temperature sensor 9 is installed at one end of the furnace body 1 located at the top of the electronic igniter 8 through a mounting seat, and the detection end of the temperature sensor 9 is located inside the stainless steel inner tank 12.

[0033] When in use, the fuel in the combustion chamber 11 can be ignited by the electronic igniter 8 , and the temperature sensor 9 can detect and display the temperature in the stainless steel inner tank 12 .

[0034] For example, Figure 1 As shown, the utility model further includes that a liquid inlet pipe 7 is fixed to one end of the furnace body 1 through a flange, and a liquid discharge pipe 6 is fixed to one end of the furnace body 1 located at the bottom of the liquid inlet pipe 7 through a flange.

[0035] When in use, the liquid inlet pipe 7 facilitates the addition of clean water, acid solution, etc. into the stainless steel inner container 12 , and the liquid discharge pipe 6 can be opened to discharge waste water, etc. in the stainless steel inner container 12 .

[0036] When the utility model is used, a person uses a power cord to connect the device to an external power source, uses a pipeline to connect the valve 10 to an external feeding device, and pours the chromium-containing waste into the stainless steel inner tank 12 through the inlet and outlet 5;

[0037] A proper amount of water is added into the stainless steel inner container 12 through the liquid inlet pipe 7, the valve 10 is opened to allow the external dye to enter the combustion chamber 11, and the dye is ignited by the electronic igniter 8, the chromium-containing waste and water in the stainless steel inner container 12 are heated, the temperature in the stainless steel inner container 12 can be understood by the temperature sensor 9, the chromium-containing waste and water are heated to 850° C. for roasting, so that the chromium in the chromium-containing waste is oxidized into water-soluble hexavalent chromium;

[0038] After the roasting is completed and the temperature in the stainless steel inner liner 12 is lowered, the electric hydraulic cylinder 201 is opened to push the pressing plate 202 downward, and the pressing plate 202 moves downward to squeeze the water-soluble hexavalent chromium in the stainless steel inner liner 12 for leaching. When the pressing plate 202 moves downward, the filter screen 203 filters the water-soluble hexavalent chromium, so that the liquid chromium is squeezed onto the pressing plate 202 through multiple through holes 204, and the liquid pump 301 is turned on to extract the liquid chromium through the telescopic tube 303 and the water inlet pipe 302 through the liquid inlet 304, and the inlet and outlet 5 are opened to take out the leached residue, and the leaching is completed;

[0039] After the leached residue in the stainless steel inner liner 12 is taken out, the liquid phase chromium is added into the stainless steel inner liner 12, and the leachate is added into the stainless steel inner liner 12 through the liquid inlet pipe 7, the liquid phase chromium is hydrolyzed and impurities are removed, and a hexavalent chromium solution is obtained by filtering, and then an acid is added into the stainless steel inner liner 12 through the liquid inlet pipe 7, and the hexavalent chromium is completely reduced to trivalent chromium by reduction with sodium metabisulfite, and then a sodium hydroxide solution is added into the stainless steel inner liner 12 for precipitation to obtain chromium hydroxide;

[0040] After hydrolysis, reduction and precipitation, chromium hydroxide is obtained, and the valve 10 is opened again to allow the fuel to enter the combustion chamber 11, and the fuel is ignited by the electronic igniter 8, and the chromium hydroxide is heated to 950°C for roasting, and finally washed with hot water until the filtrate is colorless, and dried to obtain the product chromium trioxide.

[0041] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A system for preparing chromium trioxide from chromium-containing waste, characterized in that: The invention comprises a furnace body (1), a stainless steel inner liner (12) is fixed to the top of the furnace body (1) by bolts, a combustion chamber (11) is provided inside the furnace body (1) at the bottom of a filter press assembly (2), a filter press assembly (2) is arranged on the top of the furnace body (1), the filter press assembly (2) comprises an electric hydraulic cylinder (201) mounted on the top of the furnace body (1) by a mounting frame, a pressure plate (202) is fixed to the output shaft of the electric hydraulic cylinder (201) located inside the stainless steel inner liner (12) by a flange, and a filter screen (203) is fixed to the bottom of the pressure plate (202) by bolts; A liquid pumping assembly (3) is provided at the top of the furnace body (1) on one side of the electric hydraulic cylinder (201), the liquid pumping assembly (3) comprising a liquid pump (301) mounted on one end of the top of the furnace body (1) via a mounting frame, the liquid inlet end of the liquid pump (301) being connected to a water inlet pipe (302) via a pipe joint, and a telescopic pipe (303) being fixed to the bottom end of the water inlet pipe (302) via a clamp.

2. A system for preparing chromium trioxide from chromium-containing waste according to claim 1, characterized in that: The bottom end of the telescopic tube (303) is connected to the top of the pressing plate (202) via a pipe joint, a liquid inlet (304) is provided at one end of the telescopic tube (303), and a liquid outlet pipe (305) is fixed to the liquid outlet end of the liquid pump (301) via a clamp.

3. A system for preparing chromium trioxide from chromium-containing waste according to claim 1, characterized in that: Through holes (204) are equidistantly provided inside the pressing plate (202).

4. The system for preparing chromium trioxide from chromium-containing waste according to claim 1, characterized in that: An inlet and outlet (5) is provided on one side of the furnace body (1); a feed pipe (4) is fixed to one end of the furnace body (1) at the bottom of the inlet and outlet (5) via a flange; and a valve (10) is connected to one end of the feed pipe (4) via a threaded groove.

5. The system for preparing chromium trioxide from chromium-containing waste according to claim 1, characterized in that: An electronic igniter (8) is mounted on one end of the furnace body (1) via a mounting seat, and an ignition end of the electronic igniter (8) is located inside a combustion chamber (11) of the furnace body (1). A temperature sensor (9) is mounted on one end of the furnace body (1) located on the top of the electronic igniter (8) via a mounting seat, and a detection end of the temperature sensor (9) is located inside a stainless steel inner tank (12).

6. The system for preparing chromium trioxide from chromium-containing waste according to claim 1, characterized in that: A liquid inlet pipe (7) is fixed to one end of the furnace body (1) via a flange, and a liquid discharge pipe (6) is fixed to one end of the furnace body (1) located at the bottom of the liquid inlet pipe (7) via a flange.

Images