Slurrying system for mixing quicklime with carbide slag

Abstract

The utility model discloses a slurrying system for mixing quicklime with carbide slag. The slurrying system comprises a carbide slag feeding device, a quicklime feeding device, an ash-melting feeding screw feeder, an ash-melting machine, a lime milk sieve, a hot water pipe network, a lime milk barrel, a lime milk pump and an ammonia distillation system, the system disclosed by the utility model can be used for preparing the quicklime slurry for producing sodium carbonate by an ammonia-alkali method from the carbide slag, so that the recycling value of the carbide slag is improved, the raw material cost for preparing the quicklime slurry is reduced, and the consumption of limestone and coke is reduced. And the carbide slag is recycled, so that environmental pollution caused by discharge and accumulation is avoided.

Description

Technical Field

[0001] The utility model relates to the field of comprehensive utilization of chemical production resources, in particular to a slurrying system for mixing quicklime with carbide slag. Background Art

[0002] In the production process of soda ash by the ammonia-soda process, a large amount of limestone and coke are needed to produce quicklime, which accounts for the main proportion of the production cost of soda ash. According to the unit consumption of limestone of 1.2 tons per ton of soda ash and coke of 0.1 tons per ton of soda ash, an annual production of 1 million tons of soda ash requires 1.2 million tons of limestone and 100,000 tons of coke. How to reduce consumption is related to the market competitiveness, survival and development of soda ash production enterprises by the ammonia-soda process.

[0003] On the other hand, acetylene (C2H2) is one of the important raw materials for the basic organic synthesis industry. The process of producing acetylene by adding water (wet process) with calcium carbide (CaC2) as raw material is simple and mature, and accounts for a large proportion in my country. 1 ton of calcium carbide plus water can generate more than 300 kilograms of acetylene gas, and at the same time generate 10 tons of industrial waste liquid with a solid content of about 12%, commonly known as calcium carbide slag slurry. After gravity sedimentation and filtration, the clear liquid part of the calcium carbide slurry is reused in production, and the obtained calcium carbide slag is used to produce cement, mixed with fly ash to make bricks or stacked, which not only greatly reduces the recycling value of calcium carbide slag, but also the discharge and accumulation of calcium carbide slag has caused great pollution to the environment. Summary of the invention

[0004] The utility model aims to provide a slurrying system for quicklime mixed with carbide slag, so as to realize the preparation of quicklime slurry for producing soda ash by the ammonia-soda process using carbide slag, which not only improves the recycling value of carbide slag, but also reduces the raw material cost of preparing quicklime slurry.

[0005] The utility model is implemented by the following technical scheme: a slurry system for quicklime mixed with carbide slag, which comprises a carbide slag feeding device, a quicklime feeding device, a ash feeding screw feeder, a ash machine, a lime milk screen, a hot water pipe network, a lime milk barrel, a lime milk pump and an ammonia distillation system;

[0006] The discharge port of the carbide slag feeding device and the discharge port of the quicklime feeding device are both connected to the feed port of the ash feeding screw feeder, and the discharge port of the ash feeding screw feeder is connected to the feed port of the ash machine; the outlet of the hot water pipe network is respectively connected to the ash water inlet of the ash machine and the backwash inlet of the ash machine through pipelines; the lime milk outlet of the ash machine is connected to the inlet of the lime milk screen; the ash milk outlet of the lime milk screen is connected to the inlet of the ash milk barrel; the outlet of the ash milk barrel is connected to the inlet of the ash milk pump; the outlet of the ash milk pump is connected to the ash milk inlet of the ammonia evaporation system.

[0007] Furthermore, the quicklime-carbide slag slurrying system further includes a waste sand conveying belt, and the waste sand outlet of the lime milk screen is placed above the feeding end of the waste sand conveying belt.

[0008] Furthermore, the carbide slag feeding device includes a carbide slag hopper, a carbide slag bucket elevator and a carbide slag bin, the discharge port of the carbide slag hopper is connected to the feed port of the carbide slag bucket elevator; the discharge port of the carbide slag bucket elevator is connected to the feed port of the carbide slag bin, and the discharge port of the carbide slag bin is connected to the feed port of the ash feeding screw feeder.

[0009] Furthermore, the quicklime feeding device includes a lime tank truck, a lime silo, a lime spiral scale and a lime bucket elevator; the discharge port of the lime tank truck is connected to the feed port of the lime silo through a conveying pipeline; the discharge port of the lime silo is connected to the feed port of the lime spiral scale; the discharge port of the lime spiral scale is connected to the feed port of the lime bucket elevator, and the discharge port of the lime bucket elevator is connected to the feed port of the ash feeding spiral feeder.

[0010] Advantages of the utility model:

[0011] The utility model system can realize the use of carbide slag to prepare quicklime slurry for producing soda ash by ammonia-soda process, which not only improves the recycling value of carbide slag, but also reduces the raw material cost of preparing quicklime slurry and the consumption of limestone and coke. The recycling of carbide slag avoids pollution to the environment caused by discharge and accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The utility model is a schematic diagram of the structure of a slurrying system for mixing quicklime with carbide slag.

[0014] Lime feeding screw feeder 1, lime machine 2, lime milk screen 3, hot water pipe network 4, lime milk barrel 5, lime milk pump 6, waste sand conveying belt 7, ammonia distillation system 8, carbide slag hopper 9, carbide slag bucket elevator 10, carbide slag silo 11, lime tank car 12, material conveying pipeline 13, lime silo 14, lime spiral scale 15, lime bucket elevator 16. DETAILED DESCRIPTION

[0015] 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.

[0016] A slurrying system for quicklime mixed with carbide slag comprises a carbide slag feeding device, a quicklime feeding device, a ash feeding screw feeder 1, a ash machine 2, a lime milk screen 3, a hot water pipe network 4, a ash milk barrel 5, a ash milk pump 6, a waste sand conveying belt 7 and an ammonia distillation system 8.

[0017] The carbide slag feeding device includes a carbide slag hopper 9, a carbide slag bucket elevator 10 and a carbide slag bin 11. The discharge port of the carbide slag hopper 9 is connected to the feed port of the carbide slag bucket elevator 10; the discharge port of the carbide slag bucket elevator 10 is connected to the feed port of the carbide slag bin 11.

[0018] The quicklime feeding device includes a lime tanker 12, a lime silo 14, a lime spiral scale 15 and a lime bucket elevator 16; the discharge port of the lime tanker 12 is connected to the feed port of the lime silo 14 through a conveying pipeline 13; the lime tanker 12 usually includes a tank body, a transmission device, an air compressor, a control pipeline and a discharge butterfly valve and other components, and these components work together to ensure the smooth progress of the unloading process; the working power is drawn from the automobile gearbox and drives the air compressor through the transmission device to generate compressed air; the compressed air enters the air chamber through the control pipeline, causing the lime powder material in the tank to fluidize. When the pressure in the tank reaches a certain value (such as 0.196MPa), the discharge butterfly valve is opened, and the fluidized lime powder is discharged through the pipeline under the action of the pressure difference to realize the transportation of the material. The discharge port of the lime silo 14 is connected to the feed port of the lime spiral scale 15; the discharge port of the lime spiral scale 15 is connected to the feed port of the lime bucket elevator 16;

[0019] The discharge port of the carbide slag bin 11 and the discharge port of the lime bucket elevator 16 are both connected to the feed port of the ash feeding screw feeder 1, and the discharge port of the ash feeding screw feeder 1 is connected to the feed port of the ash machine 2; the carbide slag from the carbide slag bin 11 and the quicklime powder from the lime bucket elevator 16 are sent to the ash machine 2 through the ash feeding screw feeder 1, and the carbide slag and quicklime powder can be fully mixed during the spiral conveying process in the ash feeding screw feeder 1, which is helpful for the uniformity of the ash milk prepared in the ash machine. The outlet of the hot water pipe network 4 is respectively connected to the ash water inlet of the ash machine 2 and the backwashing inlet of the ash machine 2 through pipelines; in order to prevent the pipeline in the ash machine 2 from being blocked by the ash milk, the ash machine needs to be backwashed regularly.

[0020] The lime milk outlet of the lime dissolving machine 2 is connected to the inlet of the lime milk screen 3; the lime milk outlet of the lime milk screen 3 is connected to the inlet of the lime milk barrel 5, and the waste sand outlet of the lime milk screen 3 is placed above the feeding end of the waste sand conveying belt 7. The waste sand is transported to the waste sand storage area by the waste sand conveying belt 7 and cleaned regularly. The outlet of the ash milk barrel 5 is connected to the inlet of the ash milk pump 6; the outlet of the ash milk pump 6 is connected to the ash milk inlet of the ammonia distillation system 8, and the ash milk is transported to the ammonia distillation system 8 for producing soda ash.

[0021] In this embodiment, the outer wall of the ash milk barrel 5, the outer wall of the pipe connecting the outlet of the ash milk barrel 5 and the inlet of the ash milk pump 6, and the outer wall of the pipe connecting the outlet of the ash milk pump 6 and the ash milk inlet of the ammonia distillation system 8 are all covered with an insulation layer to prevent the ash milk from settling after the temperature drops during storage and transportation, thereby ensuring that the concentration of the ash milk can meet the use requirements.

[0022] The process flow of the pulping system of this embodiment is as follows: the carbide slag is unloaded from the warehouse to the carbide slag hopper 9 by a forklift, and the carbide slag hopper 9 enters the carbide slag bucket elevator 10 after unloading, and is transported to the carbide slag bin 11 by the carbide slag bucket elevator 10, and enters the ash feeder 2 through the ash feed screw feeder 1 after being buffered by the carbide slag bin 11. At the same time, quicklime powder is transported by the lime tank car 12, and is transported to the lime bin 14 by pneumatic force, and enters the lime bucket elevator 16 through the lime spiral scale 15 after unloading, and then enters the ash feed screw feeder 1. The lime spiral scale 15 is equipped with a weighing module, and the feed ratio of carbide slag and quicklime powder is adjusted by the speed regulating device of the lime spiral scale 15. The carbide slag and quicklime powder are fully mixed by the ash feeding screw feeder 1 and the ash machine 2, and the steam condensed water at 48°C is injected for ash ash, and the residence time is 8 minutes. The obtained ash milk is filtered through the lime milk screen 3 to remove the sediment and enter the ash milk barrel 5, and then sent to the ammonia distillation system 8 by the ash milk pump 6. The waste sand filtered out by the lime milk screen 3 is sent to the waste sand storage area by the waste sand conveyor belt 7 and is regularly cleared and transported.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A slurrying system for quicklime mixed with carbide slag, characterized in that: It includes a carbide slag feeding device, a quicklime feeding device, a lime feeding screw feeder, a lime machine, a lime milk screen, a hot water pipe network, a lime milk barrel, a lime milk pump and an ammonia distillation system; The discharge port of the carbide slag feeding device and the discharge port of the quicklime feeding device are both connected to the feed port of the ash feeding screw feeder, and the discharge port of the ash feeding screw feeder is connected to the feed port of the ash machine; the outlet of the hot water pipe network is respectively connected to the ash water inlet of the ash machine and the backwash inlet of the ash machine through pipelines; the lime milk outlet of the ash machine is connected to the inlet of the lime milk screen; the ash milk outlet of the lime milk screen is connected to the inlet of the ash milk barrel; the outlet of the ash milk barrel is connected to the inlet of the ash milk pump; the outlet of the ash milk pump is connected to the ash milk inlet of the ammonia evaporation system.

2. A slurrying system for quicklime mixed with carbide slag according to claim 1, characterized in that: It also includes a waste sand conveying belt, and the waste sand outlet of the lime milk screen is placed above the feeding end of the waste sand conveying belt.

3. A slurrying system for quicklime mixed with carbide slag according to claim 1 or 2, characterized in that: The carbide slag feeding device includes a carbide slag hopper, a carbide slag bucket elevator and a carbide slag bin. The discharge port of the carbide slag hopper is connected to the feed port of the carbide slag bucket elevator; the discharge port of the carbide slag bucket elevator is connected to the feed port of the carbide slag bin, and the discharge port of the carbide slag bin is connected to the feed port of the ash feeding screw feeder.

4. A slurrying system for quicklime mixed with carbide slag according to claim 1 or 2, characterized in that: The quicklime feeding device includes a lime tank car, a lime silo, a lime spiral scale and a lime bucket elevator; the discharge port of the lime tank car is connected to the feed port of the lime silo through a conveying pipeline; the discharge port of the lime silo is connected to the feed port of the lime spiral scale; the discharge port of the lime spiral scale is connected to the feed port of the lime bucket elevator, and the discharge port of the lime bucket elevator is connected to the feed port of the ash feeding spiral feeder.

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