Device for producing calcium acetate by using phosphate tailings

Abstract

The utility model provides a device for producing calcium acetate by utilizing phosphate tailings, which comprises a phosphate tailings conveying belt and a reaction tank, the phosphate tailings conveying belt conveys the phosphate tailings into the reaction tank, a glacial acetic acid tank is connected with the reaction tank through a pipeline to provide acetic acid for the reaction tank, and the reaction tank is sequentially connected with a slurry conveying pump and a mixing adjusting tank through pipelines. Calcium powder is added into the mixing and adjusting tank, the mixing and adjusting tank is sequentially connected with a mixed slurry conveying pump and a filter press through pipelines, filter slurry of the filter press is conveyed to the extraction tank, the ethanol tank is connected with the extraction tank through a pipeline and used for providing ethanol for the extraction tank, and the extraction tank is sequentially connected with an extraction slurry pump and a belt filter through pipelines. The primary washing pipe supplies water to the belt filter to wash the filter material, and the filter material of the belt filter is conveyed to the calcium acetate finished product drying system to be dried. According to the device for producing calcium acetate by using the phosphate tailings, the phosphate tailings are recycled and used for producing calcium acetate, and waste is reduced.

Description

Technical Field

[0001] The utility model relates to the field of calcium acetate production equipment, in particular to a device for producing calcium acetate by utilizing phosphate tailings. Background Art

[0002] In addition to phosphorus, phosphate tailings also contain many useful mineral elements, such as calcium, magnesium, manganese, antimony, copper, iron, aluminum, etc., especially rich in calcium and magnesium, and the calcium grade (calculated as calcium oxide) can reach about 30%. It can be seen that the disposal of phosphate tailings is also a huge waste of resources. Using phosphate tailings as a calcium source to prepare calcium acetate can not only achieve resource recycling, but also reduce the emission of "three wastes", reduce pollution to the environment, avoid occupying precious land resources, and produce calcium acetate products with higher added value, which has considerable economic benefits. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a device for producing calcium acetate by utilizing phosphate tailings, so as to recycle the phosphate tailings for the production of calcium acetate and reduce waste.

[0004] In order to solve the above technical problems, the technical scheme adopted by the utility model is: a device for producing calcium acetate using phosphate tailings, including a phosphate tailings conveying belt and a reaction tank. The phosphate tailings conveying belt conveys the phosphate tailings into the reaction tank. The glacial acetic acid tank is connected to the reaction tank through a pipeline to provide acetic acid to the reaction tank. The reaction tank is connected to a slurry conveying pump and a mixing and adjusting tank in sequence through a pipeline. Calcium powder is added to the mixing and adjusting tank. The mixing and adjusting tank is connected to a mixed slurry conveying pump and a filter press in sequence through a pipeline. The filter slurry of the filter press is conveyed to an extraction tank. The ethanol tank is connected to the extraction tank through a pipeline to provide ethanol to the extraction tank. The extraction tank is connected to an extraction slurry pump and a belt filter in sequence through a pipeline. A primary water washing pipe supplies water to the belt filter to wash the filter material. The filter material of the belt filter is conveyed to a calcium acetate finished product drying system for drying.

[0005] In a preferred embodiment, a partition is provided in the reaction tank to separate the reaction tank into reaction zone 1 and reaction zone 2, acetic acid is added to both reaction zone 1 and reaction zone 2, the phosphate tailings conveyor belt conveys the phosphate tailings to reaction zone 1, and the slurry in reaction zone 1 overflows into reaction zone 2 for a second reaction.

[0006] In a preferred solution, the reaction tank is connected to a fan through an exhaust duct to transport the reaction waste gas to the tail gas absorption system.

[0007] In a preferred embodiment, the filter press is connected to a slurry tank via a pipeline to flush the filtered filter cake into the slurry tank. The slurry tank is connected to a slurry pump via a pipeline, and the slurry pump transports the slurry to a wet phosphoric acid system for reuse.

[0008] In a preferred embodiment, the primary water washing pipe is arranged in the rear half of the belt filter, the front half of the belt filter is connected to the extraction filtrate tank through a pipeline for collecting the extraction filtrate, the extraction filtrate tank is connected to the extraction filtrate pump through a pipeline, and the extraction filtrate pump transports the extraction filtrate to the ethanol recovery system for reuse.

[0009] In a preferred embodiment, the rear half of the belt filter is connected to the finished product washing water tank through a pipeline for collecting washing water, and the finished product washing water tank is connected to the finished product washing water pump through a pipeline, and the finished product washing water pump transports the washing water to the filter press washing system for reuse.

[0010] The utility model provides a device for producing calcium acetate by utilizing phosphate tailings, which has the following beneficial effects:

[0011] 1. This device uses phosphate tailings as a calcium source to facilitate the reuse of waste resources and solve problems related to the accumulation and storage of phosphate tailings.

[0012] 2. Reduce environmental pollution, avoid occupying precious land resources, and produce calcium acetate products with higher added value, which has considerable economic benefits.

[0013] 3. The device has a simple process and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] In the figure: phosphate tailings conveying belt 1, glacial acetic acid tank 2, reaction tank 3, slurry delivery pump 31, fan 32, partition 33, reaction zone 1 34, reaction zone 2 35, mixing and adjusting tank 4, mixed slurry delivery pump 41, filter press 5, slurry tank 6, slurry pump 61, ethanol tank 7, extraction tank 8, extraction slurry pump 81, belt filter 9, primary water washing pipe 91, extraction filtrate tank 10, extraction filtrate pump 101, finished product washing water tank 11, finished product washing water pump 111. DETAILED DESCRIPTION

[0017] like Figure 1As shown, a device for producing calcium acetate using phosphate tailings includes a phosphate tailings conveying belt for conveying phosphate tailings, including a reaction tank, the phosphate tailings conveying belt conveys the phosphate tailings to the reaction tank, and the glacial acetic acid tank is connected to the reaction tank through a pipeline to provide acetic acid to the reaction tank. The reaction tank is connected to the slurry conveying pump and the mixing and adjusting tank in sequence through a pipeline, and calcium powder is added to the mixing and adjusting tank to adjust the pH value in the mixing and adjusting tank. The mixing and adjusting tank is connected to the mixed slurry conveying pump and the filter press in sequence through a pipeline, and the mixed slurry conveying pump conveys the mixed slurry in the mixing and adjusting tank to the extraction tank, and the ethanol tank is connected to the extraction tank through a pipeline to provide ethanol to the extraction tank, and ethanol is added to the extraction tank for mixed extraction. The extraction tank is connected to the extraction slurry pump and the belt filter in sequence through a pipeline, and the primary water washing pipe supplies water to the belt filter to wash the filter material, and the filter material of the belt filter is conveyed to the calcium acetate finished product drying system for drying, and the belt filter uses a fully sealed belt filter to filter and separate the mixed slurry after extraction.

[0018] Preferably, a partition is provided in the reaction tank to separate the reaction tank into a first reaction zone and a second reaction zone, glacial acetic acid is added to both the first reaction zone and the second reaction zone, the phosphate tailings conveying belt conveys the phosphate tailings to the first reaction zone, and the slurry in the first reaction zone overflows into the second reaction zone for a second reaction, thereby achieving a graded reaction of the phosphate tailings and the glacial acetic acid and improving the sufficiency of the reaction.

[0019] The reaction tank is connected to the fan through an exhaust duct to transport the reaction waste gas to the tail gas absorption system, thereby reducing the emission of waste gas during the reaction process.

[0020] Preferably, the filter press is connected to a slurry tank via a pipeline for flushing the filtered filter cake into the slurry tank, and the slurry tank is connected to a slurry pump via a pipeline, and the slurry pump transports the slurry to a wet phosphoric acid system for reuse.

[0021] Preferably, the primary water washing pipe is arranged in the rear half of the belt filter, the front half of the belt filter is connected to the extraction filtrate tank through a pipeline for collecting the extraction filtrate, the extraction filtrate tank is connected to the extraction filtrate pump through a pipeline, and the extraction filtrate pump transports the extraction filtrate to the ethanol recovery system for reuse.

[0022] The rear half of the belt filter is connected to the finished product washing water tank through a pipeline for collecting washing water. The finished product washing water tank is connected to the finished product washing water pump through a pipeline. The finished product washing water pump transports the washing water to the filter press washing system for reuse.

[0023] The working principle of this device is as follows:

[0024] The phosphate tailings are conveyed to the reaction tank by a phosphate tailings conveyor belt, glacial acetic acid is added to the reaction tank, the fan is started, and the reaction gas (mainly carbon dioxide, hydrogen fluoride, etc.) in the reaction tank is pumped to the tail gas washing system. At the same time, the slurry after the complete reaction is conveyed to the mixing and adjusting tank, calcium powder is added to the mixing and adjusting tank, the pH of the slurry in the tank is adjusted, and after uniform mixing, it is conveyed to the filter press by a mixed slurry conveying pump. After solid-liquid separation, the filter cake is washed to the slurry tank and conveyed to the wet phosphoric acid system by a slurry pump. The filtrate overflows to the extraction tank, ethanol is added to the extraction tank, and after mixed extraction, the slurry extraction slurry is conveyed to the finished product belt filter, the filtrate flows to the extraction filtrate tank, and is conveyed to the ethanol recovery system by the extraction filtrate pump. The filter cake is washed and conveyed to the finished product drying system to produce qualified calcium acetate products.

Claims

1. A device for producing calcium acetate using phosphate tailings, comprising a phosphate tailings conveying belt, characterized in that: The method comprises a reaction tank, a phosphate tailings conveying belt conveys the phosphate tailings into the reaction tank, a glacial acetic acid tank is connected to the reaction tank through a pipeline to provide acetic acid to the reaction tank, the reaction tank is connected to a slurry conveying pump and a mixing and adjusting tank in sequence through a pipeline, calcium powder is added into the mixing and adjusting tank, the mixing and adjusting tank is connected to a mixed slurry conveying pump and a filter press in sequence through a pipeline, the filter slurry of the filter press is conveyed to an extraction tank, an ethanol tank is connected to the extraction tank through a pipeline to provide ethanol to the extraction tank, the extraction tank is connected to an extraction slurry pump and a belt filter in sequence through a pipeline, a primary water washing pipe supplies water to the belt filter to wash the filter material, and the filter material of the belt filter is conveyed to a calcium acetate finished product drying system for drying.

2. A device for producing calcium acetate using phosphate tailings according to claim 1, characterized in that: A partition is arranged in the reaction tank to separate the reaction tank into a first reaction zone and a second reaction zone. Acetic acid is added to both the first reaction zone and the second reaction zone. The phosphate tailings conveying belt conveys the phosphate tailings to the first reaction zone. The slurry in the first reaction zone overflows into the second reaction zone for a second reaction.

3. A device for producing calcium acetate using phosphate tailings according to claim 1, characterized in that: The reaction tank is connected to the fan through an exhaust pipe to transport the reaction waste gas to the tail gas absorption system.

4. A device for producing calcium acetate using phosphate tailings according to claim 1, characterized in that: The filter press is connected to the slurry tank through a pipeline to flush the filtered filter cake into the slurry tank. The slurry tank is connected to the slurry pump through a pipeline. The slurry pump transports the slurry to the wet phosphoric acid system for reuse.

5. A device for producing calcium acetate using phosphate tailings according to claim 1, characterized in that: The primary water washing pipe is arranged in the rear half of the belt filter, and the front half of the belt filter is connected to the extraction filtrate tank through a pipeline for collecting the extraction filtrate, and the extraction filtrate tank is connected to the extraction filtrate pump through a pipeline, and the extraction filtrate pump transports the extraction filtrate to the ethanol recovery system for reuse.

6. A device for producing calcium acetate using phosphate tailings according to claim 5, characterized in that: The rear half of the belt filter is connected to the finished product washing water tank through a pipeline for collecting washing water. The finished product washing water tank is connected to the finished product washing water pump through a pipeline. The finished product washing water pump transports the washing water to the filter press washing system for reuse.

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