Device for preparing arsenic-iron alloy from arsenic oxide and iron oxide

Abstract

The utility model discloses a device for preparing an arsenic-iron alloy by using arsenic oxide and iron oxide. The device comprises a raw material bin, a mixer, a briquetting machine, a block mass bin, a rotary kiln and a briquetting machine, a raw material conveying belt is arranged below the raw material bin; the tail end of the raw material conveying belt extends to the position above a feeding port of the mixer. A discharge port of the mixer is connected with a feed port of the briquetting machine through a mixed material conveying belt; a discharging hole of the briquette pressing machine is connected with a feeding hole of the briquette stock bin; a discharging opening of the block mass bin is connected with a feeding opening of the rotary kiln through a block mass conveying slide way; a discharge port of the rotary kiln is connected with the head end of the furnace charge conveying belt; and the tail end of the furnace burden conveying belt is connected with a feeding hole of the briquetting machine. The device disclosed by the utility model can be used for recycling arsenic trioxide and ferric oxide raw materials, and is perfect and reasonable in structure, convenient to operate, low in manpower and material resource cost, green, environment-friendly, high in production efficiency and suitable for industrial production.

Description

Technical Field

[0001] The utility model relates to a device for preparing arsenic-iron alloy, in particular to a device for preparing arsenic-iron alloy by using arsenic oxide and iron oxide. Background Art

[0002] Arsenic is present in various hazardous wastes, posing a high pollution risk and placing significant pressure on non-ferrous metallurgical companies. However, arsenic is also a resource, and effectively utilizing it and expanding its disposal options are crucial.

[0003] Arsenic-iron alloy is a safe material that can be used as a counterweight for construction, excavators, elevators, ships, etc. Therefore, research and development of arsenic-iron alloy is ongoing.

[0004] CN117737494A discloses a method for preparing a high-arsenic-iron alloy, a high-arsenic-iron alloy, and its applications. The method comprises the following steps: vacuum ball milling arsenic powder and iron powder under a protective atmosphere to obtain ferroarsenic powder; the method requires a molar ratio of arsenic powder to iron powder of 0.8 to 1.5:1; concurrently, mixing the ferroarsenic powder with a ferrous agent to obtain an alloy base; and hot-pressing and sintering the alloy base at high temperature to obtain the ferroarsenic alloy. Although the ferroarsenic alloy obtained by this method has low arsenic loss, i.e., a high arsenic content, it requires high-grade raw materials, such as high-content arsenic powder (As ≥ 98%) and iron powder (Fe ≥ 98%). Furthermore, the preparation process is extremely demanding, requiring an argon atmosphere, a vacuum ball mill, at room temperature and pressure, under argon protection, and prolonged tumbling and shaking on a tumbling shaker. Therefore, this method has certain limitations for large-scale production and is also costly.

[0005] CN115491534A discloses an arsenic-iron alloy, as well as a preparation method and resource recovery method. The method comprises the following steps: ball milling arsenic powder and iron powder at a molar ratio of 0.1 to 2:1 under an inert atmosphere to obtain a pretreated product; then vacuum hot pressing and sintering the pretreated product to obtain the arsenic-iron alloy; wherein the pretreated product is subjected to a pressure of 30 to 50 MPa; and the sintering process comprises heating the pretreated product from room temperature to 400 to 500°C, holding the temperature for 0.5 to 1 hour, and then heating the pretreated product from 400 to 500°C to 600 to 800°C, holding the temperature for 0.5 to 1 hour. While this method can produce an arsenic-iron alloy with high performance and low leaching toxicity, it has certain limitations. First, it requires high-content arsenic powder (As ≥ 98%) and iron powder (Fe ≥ 98%) as raw materials. Second, the production process is demanding and complex, requiring an inert atmosphere and vacuum hot pressing.

[0006] The above two methods are somewhat inadequate for treating large quantities of arsenic-containing materials, such as low-grade arsenic oxide. Therefore, there is an urgent need to develop a device for preparing arsenic-iron alloys from arsenic oxide and iron oxide that can recycle arsenic trioxide and iron oxide as raw materials, with a comprehensive and rational structure, convenient operation, low labor and material costs, environmental friendliness, high production efficiency, and suitability for industrial production. Utility Model Content

[0007] The technical problem to be solved by the utility model is to overcome the above-mentioned defects of the prior art and provide a device for preparing arsenic-iron alloy from arsenic oxide and iron oxide, which can utilize arsenic trioxide and iron oxide raw materials as resources, has a complete and reasonable structure, is easy to operate, has low manpower and material costs, is green and environmentally friendly, has high production efficiency, and is suitable for industrial production.

[0008] The technical solution adopted by the utility model to solve its technical problems is as follows: a device for preparing arsenic-iron alloy by using arsenic oxide and iron oxide, comprising a raw material silo, a mixer, a briquette machine, a lump silo, a rotary kiln and a briquette machine; a raw material conveyor belt is provided below the raw material silo; the tail end of the raw material conveyor belt extends above the feed port of the mixer; the mixer discharge port is connected to the feed port of the briquette machine through the mixing conveyor belt; the briquette machine discharge port is connected to the feed port of the lump silo; the lump silo discharge port is connected to the feed port of the rotary kiln through a lump conveying slide; the rotary kiln discharge port is connected to the head end of the charge conveyor belt; the tail end of the charge conveyor belt is connected to the feed port of the briquette machine.

[0009] Preferably, the raw material silo is divided into four silos, respectively for containing arsenic trioxide powder, iron oxide powder, coal powder, and reduced iron powder. The raw material silo is made of steel.

[0010] Preferably, a raw material silo inlet is provided at the top of the raw material silo, and a raw material silo outlet is provided at the bottom.

[0011] Preferably, the raw material silo outlet is provided with a discharge valve.

[0012] Preferably, the raw material silo is supported by a support frame.

[0013] Preferably, a meter is provided on the supporting points of the raw material silo and the supporting frame.

[0014] Preferably, the raw material conveyor belt and the mixed material conveyor belt are both made of rubber.

[0015] Preferably, the mixer is a vertical mixer or a horizontal mixer, etc. The material of the mixer is stainless steel or ordinary steel.

[0016] Preferably, the briquetting machine is a mechanical briquetting machine. The material of the briquetting machine is cast iron.

[0017] Preferably, the agglomerate silo discharge port is provided with a control valve.

[0018] Preferably, the rotary kiln is built with refractory materials.

[0019] Preferably, the flue gas outlet of the rotary kiln is connected to the flue gas inlet of the dust collector.

[0020] Preferably, a dust collecting chamber is provided at the lower portion of the dust collector.

[0021] Preferably, the exhaust gas outlet of the dust collector is connected to the exhaust gas chimney.

[0022] Preferably, the dust collector is a conventional bag dust collector or a pulse bag dust collector. The dust collection bag in the dust collector is made of fibers such as polyester, polypropylene, or acrylic. The conventional bag dust collector is a bag dust collector that does not have a pulse device and relies on manual shaking of the material.

[0023] Preferably, the exhaust gas chimney is 25 to 35 meters high and is made of brick or concrete.

[0024] Preferably, the charge conveyor belt is made of stainless steel or ordinary steel.

[0025] Preferably, the briquetting machine is a mechanical or hydraulic briquetting machine.

[0026] Preferably, the discharge port of the briquetting machine is connected to a stacking machine.

[0027] Preferably, the stacker is a mechanical or automated stacker.

[0028] The working process of the device of the utility model is as follows: arsenic trioxide powder, iron oxide powder, coal powder and reduced iron powder are respectively loaded into four raw material silos, and the four raw materials are released onto the raw material conveyor belt through the raw material silo discharge port, and the meter measures the weight of each raw material in a decrementing manner. When the weight of each raw material in the raw material silo is reduced to a set value, the meter is linked to the corresponding discharge valve to close, and the raw materials are sent to the mixer through the raw material conveyor belt for mixing. The mixed material discharged from the mixer discharge port is sent to the briquetting machine through the mixing conveyor belt for briquetting. The briquetting is released to the briquetting silo for aging, and then controlled by the control valve of the briquetting silo discharge port to be released to the rotary kiln for calcination. The arsenic-iron alloy powder or block obtained by calcination is sent to the briquetting machine by the charge conveyor belt to be briquetized into a formed arsenic-iron alloy, and the formed arsenic-iron alloy is stacked by a stacker. In the calcination process of the rotary kiln, arsenic-containing smoke dust generated is recovered by the dust collector, the arsenic-containing dust is collected in the dust collecting chamber, and arsenic-free waste gas is discharged through the waste gas chimney.

[0029] The beneficial effects of the device of the utility model are as follows: the device of the utility model can utilize arsenic trioxide and iron oxide raw materials as resources, has a perfect and reasonable structure, is easy to operate, has low manpower and material costs, is green and environmentally friendly, has high production efficiency, and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of embodiment 1 of the device for preparing arsenic-iron alloy using arsenic oxide and iron oxide according to the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0032] Example 1 of a device for preparing arsenic-iron alloy using arsenic oxide and iron oxide

[0033] like Figure 1 As shown, a device for preparing arsenic-iron alloy from arsenic oxide and iron oxide includes a raw material silo 1, a mixer 2, a briquetting machine 3, a lump silo 4, a rotary kiln 5 and a briquetting machine 6; a raw material conveyor belt 7 is provided below the raw material silo 1; the tail end of the raw material conveyor belt 7 extends above the feed port 2-1 of the mixer 2; the discharge port 2-2 of the mixer 2 is connected to the feed port 3-1 of the briquetting machine 3 through the mixing conveyor belt 8; the discharge port 3-2 of the briquetting machine 3 is connected to the feed port 4-1 of the lump silo 4; the discharge port 4-2 of the lump silo 4 is connected to the feed port 5-1 of the rotary kiln 5 through the lump conveying slide 4-3; the discharge port 5-2 of the rotary kiln 5 is connected to the head end of the charge conveyor belt 9; the tail end of the charge conveyor belt 9 is connected to the feed port 6-1 of the briquetting machine 6;

[0034] The raw material silo 1 is divided into four silos, which are respectively used to contain arsenic trioxide powder, iron oxide powder, coal powder and reduced iron powder; the material of the raw material silo 1 is steel; the top of the raw material silo 1 is provided with a raw material silo 1 feed port 1-1, and the bottom is provided with a raw material silo 1 discharge port 1-2; the raw material silo discharge port 1-2 is provided with a discharge valve 1-2-1; the raw material silo 1 is supported by a support frame 1-3; a meter 1-3-1 is provided on the supporting point of the raw material silo 1 and the support frame 1-3; the raw material conveyor belt 7 and the mixing conveyor belt 8 are both made of rubber; the mixer 2 is a vertical mixer; the material of the vertical mixer is stainless steel; the briquetting machine 3 is a mechanical ball press; the material of the mechanical ball press is cast iron; the discharge port 4-2 of the briquette silo 4 is provided with a control valve 4-2-1;

[0035] The rotary kiln 5 is constructed of refractory materials; the flue gas outlet 5-3 of the rotary kiln 5 is connected to the flue gas inlet 11-1 of the dust collector 11; a dust collecting chamber 11-2 is provided at the lower portion of the dust collector 11; the exhaust gas outlet 11-3 of the dust collector 11 is connected to the exhaust gas chimney 12; the dust collector 11 is a pulse bag dust collector; the dust bags in the pulse bag dust collector are made of polyester fiber; the exhaust gas chimney 12 is 30m high; the exhaust gas chimney 12 is brick-built; the charge conveyor belt 9 is made of stainless steel; the briquetting machine 6 is a hydraulic briquetting machine;

[0036] The discharge port 6 - 2 of the briquetting machine 6 is connected to a stacking machine 10 ; the stacking machine 10 is an automatic stacking machine.

[0037] The working process of the device of the utility model is as follows: arsenic trioxide powder, iron oxide powder, coal powder and reduced iron powder are respectively loaded into four raw material silos 1, and the four raw materials are released onto the raw material conveyor belt 7 through the discharge port 1-2 of the raw material silo 1. The meter 1-3-1 measures the weight of each raw material in a decrementing manner. When the weight of each raw material in the raw material silo 1 is reduced to a set value, the meter 1-3-1 is linked to the corresponding discharge valve 1-2-1 to close, and the raw materials are sent to the mixer 2 through the raw material conveyor belt 7 for mixing. The mixed materials discharged from the discharge port 2-2 of the mixer 2 are passed through the mixing machine 2. The mixing material is fed into the briquetting machine 3 by the mixing conveyor belt 8 for briquetting. The briquetting is released into the briquetting silo 4 for aging, and then is controlled to be released into the rotary kiln 5 for calcination through the control valve 4-2-1 of the discharge port 4-2 of the briquetting silo 4. The arsenic-iron alloy blocks obtained by calcination are fed to the briquetting machine 6 by the charge conveyor belt 9 for briquetting into formed arsenic-iron alloy. The formed arsenic-iron alloy is stacked by the stacking machine 10. During the calcination process of the rotary kiln 5, arsenic-containing smoke dust generated is recovered by the dust collector 11, and the arsenic-containing dust is collected in the dust collecting chamber 11-2. Arsenic-free waste gas is discharged through the waste gas chimney 12.

Claims

1. A device for preparing arsenic-iron alloy using arsenic oxide and iron oxide, characterized in that: It includes a raw material silo, a mixer, a briquette machine, a lump silo, a rotary kiln and a briquette machine; a raw material conveyor belt is arranged under the raw material silo; the tail end of the raw material conveyor belt extends to above the feed port of the mixer; the discharge port of the mixer is connected with the feed port of the briquette machine through the mixing conveyor belt; the discharge port of the briquette machine is connected with the feed port of the lump silo; the discharge port of the lump silo is connected with the feed port of the rotary kiln through the lump conveying slide; the discharge port of the rotary kiln is connected with the head end of the charge conveyor belt; the tail end of the charge conveyor belt is connected with the feed port of the briquette machine.

2. The device for preparing arsenic-iron alloy by using arsenic oxide and iron oxide according to claim 1, characterized in that: The raw material silo is divided into four silos; a raw material silo inlet is provided at the top of the raw material silo, and a raw material silo outlet is provided at the bottom; a discharge valve is provided at the raw material silo outlet; the raw material silo is supported by a support frame; a meter is provided at the supporting point of the raw material silo and the support frame; the mixer is a vertical mixer or a horizontal mixer; the briquetting machine is a mechanical briquetting machine; a control valve is provided at the briquetting silo outlet.

3. The device for preparing arsenic-iron alloy by using arsenic oxide and iron oxide according to claim 1 or 2, characterized in that: The smoke outlet of the rotary kiln is connected to the smoke inlet of the dust collector; a dust collecting chamber is provided at the lower part of the dust collector; the exhaust gas outlet of the dust collector is connected to the exhaust gas chimney; the dust collector is an ordinary bag dust collector or a pulse bag dust collector; the briquetting machine is a mechanical or hydraulic briquetting machine.

4. The device for preparing arsenic-iron alloy by using arsenic oxide and iron oxide according to claim 1 or 2, characterized in that: The discharge port of the briquetting machine is connected to a stacking machine; the stacking machine is a mechanical or automatic stacking machine.

5. The device for preparing arsenic-iron alloy by using arsenic oxide and iron oxide according to claim 3, characterized in that: The discharge port of the briquetting machine is connected to a stacking machine; the stacking machine is a mechanical or automatic stacking machine.

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