Production system for producing anti-freezing solution and dust suppressant by using carbide slag

Abstract

The utility model discloses a production system for producing an anti-freezing solution and a dust suppressant by using carbide slag, which comprises a stirring tank, a water adding pipeline arranged on the stirring tank, a metering valve arranged on the water adding pipeline and a calcium chloride solution adding pipeline arranged on the stirring tank, and the calcium chloride solution adding pipeline is connected with a mother liquor precipitation tank through a metering pump and a valve. An inlet of the mother liquor precipitation tank is connected with a calcium carbide slag calcium chloride solution preparation unit, a calcium hydroxide adding pipeline is arranged on the stirring tank and connected with a calcium hydroxide solution storage tank, a metering pump and a valve are arranged on the calcium hydroxide adding pipeline, and other raw material adding pipelines are arranged on the stirring tank. Other raw material adding pipelines are connected with other raw material storage tanks through metering pumps and valves, other raw material storage tanks are also provided with water adding pipelines, and the bottom of the stirring tank is provided with a material outlet pipeline which is connected with an anti-freezing solution or dust suppressant finished product tank. The system is simple in structure, can realize continuous batch production, is environment-friendly and efficient, and achieves the purpose of waste utilization.

Description

Technical Field

[0001] This utility model relates to the field of waste utilization technology, specifically a production system for producing antifreeze and dust suppressant using carbide slag. Background Technology

[0002] Calcium carbide slag is the waste residue mainly composed of calcium hydroxide after the hydrolysis of calcium carbide to obtain acetylene gas. For a long time, this waste has not been fully utilized and treated, and is generally disposed of by dumping, which has caused environmental pollution and wasted resources.

[0003] The applicant has developed a project to produce coal antifreeze and dust suppressant using calcium carbide slag. This requires first reacting the calcium carbide slag with synthetic or byproduct hydrochloric acid to generate a calcium chloride solution, which is then used to prepare the antifreeze and dust suppressant. Therefore, a production system suitable for large-scale mass production needs to be developed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a production system for producing antifreeze and dust suppressants using carbide slag. This system has a simple structure, can achieve continuous batch production, and is environmentally friendly and efficient.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a production system for producing antifreeze and dust suppressant using calcium carbide slag, comprising a mixing tank, characterized in that: a mixing structure is provided inside the mixing tank; a water inlet pipeline is provided on the mixing tank; a metering valve is provided on the water inlet pipeline; a calcium chloride solution inlet pipeline is provided on the mixing tank; the calcium chloride solution inlet pipeline is connected to a mother liquor sedimentation tank via a metering pump and a valve; the inlet of the mother liquor sedimentation tank is connected to a calcium carbide slag-based calcium chloride solution production unit; a calcium hydroxide inlet pipeline is provided on the mixing tank and connected to a calcium hydroxide solution storage tank; a metering pump and a valve are provided on the calcium hydroxide inlet pipeline; other raw material inlet pipelines are provided on the mixing tank; other raw material inlet pipelines are connected to other raw material storage tanks via metering pumps and valves; water inlet pipelines are also provided on the other raw material storage tanks; and a material outlet pipeline is provided at the bottom of the mixing tank and connected to an antifreeze or dust suppressant finished product tank.

[0006] In the above scheme: a pH meter is installed inside the mixing tank.

[0007] Various materials are pumped into a mixing tank using a metering pump, maintaining continuous mixing. Corrosion inhibitors, flame retardants, and pH-adjusting calcium hydroxide are added sequentially, followed by uniform mixing. After sampling and analysis confirms compliance, the materials are pumped to a finished product storage tank. The finished product is then packaged in tank trucks or IBCs for sale.

[0008] In the above scheme: the calcium chloride solution production unit from calcium carbide slag includes a reaction tank and a calcium carbide slag silo. The reaction tank is equipped with a calcium carbide slag hopper and a calcium carbide slag conveying structure for transporting calcium carbide slag from the silo to the hopper. A hydrochloric acid solution inlet pipeline is installed on the reaction tank, connected to a hydrochloric acid solution storage tank. A hydrochloric acid metering pump and flow valve are installed on the hydrochloric acid solution inlet pipeline. A tail gas pipeline is installed on the reaction tank, connected to a tail gas absorption device. A drain valve and a reaction liquid outlet valve are installed at the bottom of the reaction tank, respectively connected to… The neutralization tank is connected to the feed pipe. The calcium emulsion tank is equipped with a lime addition port and a lime feeding screw. The feed end of the lime feeding screw is equipped with a lime hopper. The calcium emulsion tank is equipped with a water inlet pipe and a discharge pipe that is connected to the emulsion inlet pipe of the neutralization tank. The neutralization tank and the calcium emulsion tank are respectively equipped with stirring structures. The discharge pipe of the neutralization tank is connected to the feed pipe of the filter press. The filtrate outlet pipe of the filter press is connected to the mother liquor sedimentation tank. The filter press is equipped with a rinsing pipe, and the rinsing liquid outlet pipe of the filter press is connected to the water inlet pipe of the calcium emulsion tank.

[0009] In the above scheme: the reaction vessel is equipped with an exhaust pipe connected to a Roots blower. The Roots blower blows bubbles into the reaction vessel, which can act as a stirrer and maintain a slight positive pressure inside the vessel.

[0010] In the above scheme: the carbide slag conveying structure includes a vibrating feeder located at the discharge port below the carbide slag silo. The outlet of the vibrating feeder is connected to the starting end of a steep-angle belt conveyor, and the tail end of the steep-angle belt conveyor is connected to a horizontal belt conveyor. The horizontal belt conveyor is connected to the carbide slag hopper. Both the vibrating feeder and the steep-angle belt conveyor are existing technologies. The vibrating feeder allows the carbide slag in the carbide slag silo to fall onto the steep-angle belt conveyor, and then the horizontal belt conveyor transports it to the carbide slag hopper and into the reaction tank.

[0011] In the above scheme: pumps and valves are respectively installed on the discharge pipeline of the calcium emulsion tank and the discharge pipeline of the neutralization tank.

[0012] In the above scheme: the flushing liquid outlet pipeline of the filter press is connected to the flushing liquid buffer tank, and the flushing liquid buffer tank is connected to the inlet water pipeline of the calcium emulsion tank through a pump and valves. The flushing water is used for the preparation of the emulsion.

[0013] In the above scheme: the tail gas absorption device includes a primary tail gas absorption tower, a secondary tail gas absorption tower, and a tertiary tail gas absorption tower connected in sequence. The tail gas inlet pipeline in the middle of the primary tail gas absorption tower is connected to the tail gas pipeline of the reaction tank. The bottoms of the primary, secondary, and tertiary tail gas absorption towers are respectively equipped with lime pipelines connected to branch pipes of the discharge pipeline of the calcium slurry tank. The tail gas inlets of the primary, secondary, and tertiary tail gas absorption towers are located in the middle. The upper part of the primary, secondary, and tertiary tail gas absorption towers is filled with packing material, and a spray structure is installed above the packing material. The spray structures of the primary, secondary, and tertiary tail gas absorption towers are connected to the outlet pipelines of their respective circulating pumps. The inlets of their respective circulating pumps are connected to the bottom circulating liquid outlet pipelines of the primary, secondary, and tertiary tail gas absorption towers. Branch pipes from the outlet pipelines of the circulating pumps of the primary and secondary tail gas absorption towers also connect to the feed pipeline of the neutralization tank. After the hydrogen chloride-containing gas is neutralized by the spray, the liquid returns to the neutralization tank, and the gas is discharged through the exhaust stack of the tertiary tail gas absorption tower.

[0014] The aerated concrete block transfer clamp provided by this utility model has the following beneficial effects: This utility model utilizes carbide slag and approximately 31% hydrochloric acid solution (which can be a byproduct of the hydrochloric acid) to first generate a calcium chloride solution of no less than 30%. This calcium chloride solution is used as a raw material for producing antifreeze and dust suppressants, achieving the purpose of utilizing carbide slag waste. The calcium chloride solution preparation unit uses a tail gas absorption device to absorb trace amounts of hydrogen chloride gas during the reaction process with calcium hydroxide emulsion. The absorbed emulsion is returned to the neutralization tank, where calcium chloride can be recovered without generating waste gas. The rinsing wastewater is returned to the calcium emulsion tank for preparing calcium hydroxide emulsion, without generating wastewater. This system achieves the recycling of carbide slag without generating any secondary pollution.

[0015] Calcium chloride solution and other raw materials (prepared solutions) used to prepare antifreeze and dust suppressants are added to the mixing tank via metering pumps and valves. No solid waste or waste gas is generated, which can realize automated production and reduce labor costs. Attached Figure Description

[0016] Figure 1 This is a process flow diagram of the present invention.

[0017] Figure 2 Layout diagram of the unit reaction vessel for producing calcium chloride solution from carbide slag.

[0018] Figure 3 Layout diagram of calcium emulsion tank and neutralization tank for calcium chloride solution preparation unit from carbide slag.

[0019] Figure 4 Layout diagram of the filter press and mother liquor sedimentation tank for the calcium chloride solution production unit from carbide slag.

[0020] Figure 5 Layout diagram of the tail gas absorption device for the calcium chloride solution production unit from carbide slag. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1-5 As shown, the production system for producing antifreeze and dust suppressant using calcium carbide slag includes a mixing tank 13, which is equipped with a stirring structure. A water inlet pipeline 1301 is installed on the mixing tank 13, and a metering valve is installed on the water inlet pipeline. A calcium chloride solution inlet pipeline is also installed on the mixing tank 13, and the calcium chloride solution inlet pipeline is connected to a mother liquor sedimentation tank 11 via a metering pump and valve. Figure 1 The mother liquor sedimentation tank and the mother liquor sedimentation tank of the calcium chloride solution production unit of carbide slag are connected to each other (the supernatant is taken). The inlet of the mother liquor sedimentation tank is connected to the calcium chloride solution production unit of carbide slag. A branch pipe is split from the outlet pipeline of the metering pump and returns to the mother liquor sedimentation tank 11 to prevent material backflow in case of emergency.

[0023] A calcium hydroxide addition pipeline is installed on the mixing tank 13, connecting it to the calcium hydroxide solution storage tank 14. The calcium hydroxide addition pipeline is equipped with a metering pump and valve. Other raw material addition pipelines are also installed on the mixing tank 13, connected to other raw material storage tanks via metering pumps and valves. Water addition pipelines, equipped with metering valves, are also installed on the other raw material storage tanks. Both the calcium hydroxide solution storage tank 14 and the other raw material storage tanks are equipped with stirring structures for preparing the raw material solutions. Adding the prepared solutions is convenient, does not generate dust pollution, and reduces the labor intensity of workers.

[0024] Other raw material storage tanks, such as Figure 1 The first raw material storage tank 15 and the second raw material storage tank 16 are shown. In this project, in addition to the calcium hydroxide solution and 30% calcium chloride solution used to adjust the pH, the antifreeze also contains silicate corrosion inhibitor, ammonium molybdate and ammonium borate. When using it, the ammonium molybdate and ammonium borate are prepared into a solution and added to the first raw material storage tank, and the silicate corrosion inhibitor is added to the second raw material storage tank.

[0025] When producing dust suppressants, ammonium molybdate and ammonium borate are replaced with carboxymethyl cellulose and sodium dodecyl sulfonate.

[0026] The bottom of the mixing tank 13 is equipped with a material outlet pipeline connected to the antifreeze or dust suppressant finished product tank 17. The finished product in the antifreeze or dust suppressant finished product tank 17 is pumped to a transfer vehicle. A pH meter 16 is installed inside the mixing tank.

[0027] The calcium chloride solution production unit from calcium carbide slag includes a reaction tank 1 and a calcium carbide slag silo 2, such as... Figure 2 As shown, there can be multiple reaction vessels 1 arranged side by side. In practical applications, the calcium carbide slag silo 2 is located underground to reduce surface pollution. The reaction vessels 1 are supported by brackets and are positioned higher than the calcium carbide slag silo.

[0028] The reaction tank 1 is equipped with a calcium carbide slag hopper 101, and a valve is installed at the bottom of the calcium carbide slag hopper 101. This is existing technology and will not be described in detail here. The reaction tank 1 is equipped with a calcium carbide slag conveying structure to transport calcium carbide slag from the calcium carbide slag silo to the calcium carbide slag hopper. The reaction tank 1 is equipped with a hydrochloric acid solution inlet pipeline, which is connected to a hydrochloric acid solution storage tank 3. A hydrochloric acid metering pump 301 and a flow valve 302 are installed on the hydrochloric acid solution inlet pipeline. It is preferable that multiple hydrochloric acid metering pumps share a single metering pump, and the outlet pipeline of the metering pump enters the reaction tank 1 through the flow valve 302. The reaction tank 1 is equipped with a tail gas pipeline 104 connected to a tail gas absorption device, and a valve is also installed on the tail gas pipeline. A drain valve 102 and a reaction liquid outlet valve 103 are installed at the bottom of the reaction tank 1. The drain valve 102 and the reaction liquid outlet valve 103 are connected to the feed pipe of the neutralization tank 4 through pipelines. There can also be multiple neutralization tanks. Figure 3 There are two neutralization tanks 1, with reaction liquid outlet valves 103 connected to two neutralization tanks 4 respectively, and drain valves 102 connected to only one neutralization tank 4. Each reaction tank 1 is equipped with an induced draft pipe connected to a Roots blower 105. Valves are installed on the induced draft pipes. The Roots blower 105 blows air into the reaction tank.

[0029] Preferably, the carbide slag conveying structure includes a vibrating feeder 201 located at the discharge port below the carbide slag silo 2. The vibrating feeder 201 is existing technology and will not be described in detail here. The outlet of the vibrating feeder 201 is connected to the starting end of a steep-angle belt conveyor 203, and the tail end of the steep-angle belt conveyor 203 is connected to a horizontal belt conveyor 204. The horizontal belt conveyor 204 is connected to the carbide slag hopper 101. Figure 2 As shown, when there is a row of reaction vessels, a plow-type distributor is provided for each calcium carbide slag hopper. The structure of the plow-type distributor is existing technology and will not be described in detail here.

[0030] The calcium emulsion tank 5 is equipped with a lime addition port, which is fitted with a lime feeding screw 501. The feed end of the lime feeding screw 501 is equipped with a lime hopper 502, used for adding lime, which is then fed into the calcium emulsion tank 5 via the lime feeding screw 501. The calcium emulsion tank 5 is equipped with a water inlet pipeline 503, on which a metering valve is installed. The calcium emulsion tank 5 is also equipped with discharge pipelines, each connected to the emulsion inlet pipeline of each neutralization tank 4, and each emulsion inlet pipeline is equipped with a valve. Both the neutralization tank 4 and the calcium emulsion tank 5 are equipped with stirring structures. The discharge pipeline 401 of the neutralization tank 4 is connected to the feed pipeline of the filter press 6. The filter press 6 consists of two plate and frame filter presses, arranged side-by-side and operating simultaneously. The discharge pipeline 401 of the neutralization tank 4 is connected to the feed pipelines of the two filter presses 6. The filtrate outlet pipeline of the filter press 6 is connected to the mother liquor sedimentation tank 11. The filter press is equipped with a flushing pipeline, and valves are installed on the feed pipeline, filtrate outlet pipeline, and flushing pipeline of the filter press. The flushing pipeline is connected to a tap water pipe. Specifically, metering pumps and valves are installed on the discharge pipelines of the calcium emulsion tank 5 and the neutralization tank. The flushing liquid outlet pipeline of the filter press 6 is connected to the inlet pipeline 503 of the calcium emulsion tank 5. Preferably, the flushing liquid outlet pipeline of the filter press 6 is connected to the flushing liquid buffer tank 601, and the flushing liquid buffer tank is connected to the inlet pipeline 503 of the calcium emulsion tank 5 through a pump and valves (not shown in the figure).

[0031] The exhaust gas absorption device includes a first-stage exhaust gas absorption tower 7, a second-stage exhaust gas absorption tower 8, and a third-stage exhaust gas absorption tower 9 connected in sequence. The exhaust gas inlets of the first-stage exhaust gas absorption tower 7, the second-stage exhaust gas absorption tower 8, and the third-stage exhaust gas absorption tower 9 are all located in the middle, and the gas outlets are located at the top. The gas outlet of the third-stage exhaust gas absorption tower 9 is connected to an exhaust stack. The tail gas inlet pipeline in the middle of the primary tail gas absorption tower 7 is connected to the tail gas pipeline 104 of the reaction tank 1. The bottom of the primary tail gas absorption tower 7, the secondary tail gas absorption tower 8, and the tertiary tail gas absorption tower 9 are respectively provided with lime pipeline a, which is connected to a branch pipe of the discharge pipeline of the calcium emulsion tank 5. The upper part of the primary tail gas absorption tower 7, the secondary tail gas absorption tower 8, and the tertiary tail gas absorption tower 9 is provided with packing b. A spray structure c is provided above the packing b. The spray structure of the primary tail gas absorption tower 7, the secondary tail gas absorption tower 8, and the tertiary tail gas absorption tower 9 is respectively connected to the outlet pipeline of their respective circulating pump 10. The inlet of their respective circulating pump 10 is connected to the bottom circulating liquid outlet pipeline of the primary tail gas absorption tower 7, the secondary tail gas absorption tower 8, and the tertiary tail gas absorption tower 9. A tap water supply pipe 901 is also provided at the bottom of the tertiary tail gas absorption tower 9. The outlet pipelines of the circulating pumps of the primary and secondary tail gas absorption towers also branch off into branch pipes (d) which connect to the feed pipeline of the neutralization tank 4. The tail gas absorption device can be equipped with an induced draft fan (12), located between the secondary tail gas absorption tower 8 and the tertiary tail gas absorption tower 9.

[0032] The calcium carbide slag is transported from the temporary stockpile to the calcium carbide slag silo by a loader, and then conveyed to the horizontal belt conveyor at the top of the reaction tank by a steeply inclined belt conveyor. Finally, it is evenly added to each reaction tank 1 by a plow-type distributor.

[0033] Synthetic (or by-product) hydrochloric acid from hydrochloric acid solution storage tank 3 is pumped and metered before entering the reaction tank. Under slight positive pressure, the hydrochloric acid reacts with calcium carbide slag to produce calcium chloride solution. During the reaction, some hydrogen chloride gas will escape from the hydrochloric acid. The trace amount of hydrogen chloride gas escaping from the reaction tank is collected and enters the tail gas absorption device, where it is absorbed by the calcium hydroxide solution and then discharged through the exhaust stack (15m high) in compliance with emission standards.

[0034] The acidic calcium chloride solution generated by the reaction is neutralized by adding a corresponding calcium hydroxide emulsion according to the pH value, under normal temperature and pressure. The neutralized calcium chloride solution is then pumped to a plate and frame filter press for filtration. The resulting clear calcium solution is sent to a mother liquor tank for sedimentation and storage for later use. A calcium chloride solution of not less than 30% can be prepared by reacting 31% hydrochloric acid with carbide slag.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A production system for producing anti-freezing fluid, dust suppressant using carbide slag, comprising a stirring tank, characterized in that: The stirring tank is provided with a stirring structure, the stirring tank is provided with a water adding pipeline, the water adding pipeline is provided with a metering valve, the stirring tank is provided with a calcium chloride solution adding pipeline, the calcium chloride solution adding pipeline is connected with a mother liquor precipitation tank through a metering pump and a valve, the inlet of the mother liquor precipitation tank is connected with a calcium chloride solution unit prepared from calcium carbide slag, the stirring tank is provided with a calcium hydroxide adding pipeline connected with a calcium hydroxide solution storage tank, the calcium hydroxide adding pipeline is provided with a metering pump and a valve, the stirring tank is provided with an other raw material adding pipeline, the other raw material adding pipeline is connected with an other raw material storage tank through a metering pump and a valve, the other raw material storage tank is also provided with a water adding pipeline, and the bottom of the stirring tank is provided with a material outlet pipeline connected with an antifreeze or dust suppressant product tank. ​ 2. The production system for producing anti-freezing fluid and dust suppressant using carbide slag according to claim 1, characterized in that: The stirring tank is provided with a pH meter.

3. The production system for producing the anti-freezing solution and the dust suppressant using the carbide slag according to claim 1 or 2, characterized in that: The calcium chloride solution unit prepared from calcium carbide slag comprises a reaction tank and a calcium carbide slag bin, the reaction tank is provided with a calcium carbide slag hopper, the reaction tank is provided with a calcium carbide slag conveying structure for conveying calcium carbide slag from the calcium carbide slag bin to the calcium carbide slag hopper, the reaction tank is provided with a hydrochloric acid solution adding pipeline connected with a hydrochloric acid solution storage tank, the hydrochloric acid solution adding pipeline is provided with a hydrochloric acid metering pump and a flow valve, the reaction tank is provided with a tail gas pipeline connected with a tail gas absorption device, the bottom of the reaction tank is provided with a blowdown valve and a reaction liquid outlet valve, the blowdown valve and the reaction liquid outlet valve are respectively connected with a feed pipe of a neutralization tank, the calcium milk tank is provided with a lime adding port, the lime adding port is provided with a lime feed screw, the feed end of the lime feed screw is provided with a lime hopper, the calcium milk tank is provided with a water inlet pipeline, the calcium milk tank is provided with a discharge pipeline connected with an emulsion inlet pipeline of the neutralization tank, the neutralization tank and the calcium milk tank are respectively provided with stirring structures, the discharge pipeline of the neutralization tank is connected with a filter press feed pipeline, the filtrate outlet pipeline of the filter press is connected with a mother liquor precipitation tank, the filter press is provided with a flushing pipeline, and the flushing liquid outlet pipeline of the filter press is connected with the water inlet pipeline of the calcium milk tank.

4. The production system for producing anti-freezing fluid and dust suppressant using carbide slag according to claim 3, characterized in that: The reaction tank is provided with an air duct connected with a Roots blower.

5. The production system for producing anti-freezing fluid and dust suppressant using carbide slag according to claim 4, wherein: The calcium carbide slag conveying structure comprises a vibrating feeder located at the discharge port below the calcium carbide slag bin, the outlet of the vibrating feeder is connected with the starting end of a large-inclination-angle belt conveyor, the tail end of the large-inclination-angle belt conveyor is connected with a horizontal belt conveyor, and the horizontal belt conveyor is connected with the calcium carbide slag hopper.

6. The production system for producing anti-freezing fluid and dust suppressant using carbide slag according to claim 5, wherein: The discharge pipeline of the calcium milk tank and the discharge pipeline of the neutralization tank are respectively provided with a pump and a valve.

7. The production system for producing anti-freezing fluid and dust suppressant using carbide slag according to claim 6, characterized in that: The flushing liquid outlet pipeline of the filter press is connected with a flushing liquid buffer tank, and the flushing liquid buffer tank is connected with the water inlet pipeline of the calcium milk tank through a pump and a valve.

8. The production system for producing anti-freezing fluid and dust suppressant using carbide slag according to claim 7, characterized in that: The tail gas absorption device comprises a first-stage tail gas absorption tower, a second-stage tail gas absorption tower and a third-stage tail gas absorption tower connected in sequence, the middle tail gas inlet pipeline of the first-stage tail gas absorption tower is connected with the tail gas pipeline of the reaction tank, the bottoms of the first-stage tail gas absorption tower, the second-stage tail gas absorption tower and the third-stage tail gas absorption tower are respectively connected with the branch pipelines of the discharge pipelines of the lime pipelines and the calcium milk pools, the tail gas inlets of the first-stage tail gas absorption tower, the second-stage tail gas absorption tower and the third-stage tail gas absorption tower are arranged in the middle parts, the upper parts in the first-stage tail gas absorption tower, the second-stage tail gas absorption tower and the third-stage tail gas absorption tower are provided with the fillers, the spray structures are arranged above the fillers, the spray structures of the first-stage tail gas absorption tower, the second-stage tail gas absorption tower and the third-stage tail gas absorption tower are respectively connected with the outlet pipelines of the respective circulating pumps, the inlets of the respective circulating pumps are connected with the bottom circulating liquid outlet pipelines of the first-stage tail gas absorption tower, the second-stage tail gas absorption tower and the third-stage tail gas absorption tower, and the outlet pipelines of the circulating pumps of the first-stage tail gas absorption tower and the second-stage tail gas absorption tower further branch out branch pipelines connected with the feed pipelines of the neutralization pools.

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