Production system for industrial byproduct gypsum

Abstract

The utility model discloses a production system for industrial byproduct gypsum. The production system comprises a grinding and slurrying part, a waste acid neutralizing part, a raw gypsum filter pressing part and an auxiliary part, the grinding and slurrying part comprises a stone powder hopper, a grinding machine, a stone powder bin and a slurrying pool which are connected in sequence; the waste acid neutralization part comprises a waste acid storage pool and a neutralization pool, the waste acid storage pool is respectively connected with a fan, secondary steam of an anthraquinone production workshop and waste sulfuric acid, and the waste acid storage pool and the pulping pool are respectively connected with the neutralization pool; the gypsum filter pressing part comprises a vacuum filter; the vacuum filter is connected with the neutralizing tank; the auxiliary part comprises an air compressor and a mother liquor pool, and the air compressor is connected with the pulping pool, the neutralizing pool and the vacuum filter; the vacuum filter is connected with the mother liquor pool, and the mother liquor pool is respectively connected with the neutralization pool, the pulping pool and the sewage station. The device not only can be used for producing industrial gypsum, but also can be used for effectively treating waste sulfuric acid generated in anthraquinone production.

Description

Technical Field

[0001] The utility model belongs to the technical field of raw gypsum production, and in particular relates to a production system for industrial by-product gypsum. Background Art

[0002] In recent years, with the continuous advancement and deepening of my country's building energy conservation and wall material maintenance reforms, the gypsum industry has developed rapidly. With the depletion of high-quality natural gypsum resources and the development of environmental protection, green industries and other national needs, gypsum raw materials have undergone tremendous changes, from natural gypsum to industrial by-product gypsum. Industrial by-product gypsum, also known as chemical gypsum, is a by-product with calcium sulfate as the main component generated by chemical reactions in the production of industrial products. Industrial by-product raw gypsum has great advantages in building materials and has a broad market. It is of great significance to save resources, improve the environment and improve overall benefits.

[0003] 2-Ethylanthraquinone is an important oxidant and acid catalyst, widely used in organic synthesis, pigments, dyes and medicine. 2-Ethylanthraquinone will produce a large amount of waste sulfuric acid in industrial production. At present, the production process of 2-ethylanthraquinone and anthraquinone basically uses fuming concentrated sulfuric acid as a catalyst. For every ton of anthraquinone product produced, 6 to 10 tons of waste concentrated sulfuric acid will be produced, and for every ton of ethylanthraquinone produced, 15 tons of waste sulfuric acid will be produced. The main component of the waste sulfuric acid produced is dilute sulfuric acid with high COD and low concentration of organic matter, which is very difficult to handle later. At the same time, waste sulfuric acid contains a lot of tar and other organic impurities. After neutralization with alkali, a large amount of wastewater and waste salt are produced, which is particularly polluting to the environment. In addition, waste sulfuric acid containing tar can only be treated as hazardous waste, and the treatment cost is very high. Many domestic manufacturers have been forced to stop production because of the inability to treat waste sulfuric acid. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art and to provide a production system for industrial by-product gypsum. The utility model takes safety, environmental protection and economy into consideration, combines the actual production of 2-ethylanthraquinone, utilizes limestone powder (calcium carbonate) and waste sulfuric acid generated in the production of anthraquinone to neutralize the by-product gypsum, and provides an effectively operable production system, which can not only produce industrial raw gypsum, but also effectively treat the waste sulfuric acid generated in the production of anthraquinone.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A production system for industrial by-product gypsum, comprising:

[0007] The grinding and pulping section includes a stone powder hopper, a grinding machine, a stone powder bin and a pulping tank connected in sequence;

[0008] The waste acid neutralization section includes a waste acid storage tank and a neutralization tank. The feed port of the waste acid storage tank is respectively connected to the fan, the secondary steam outlet of the anthraquinone production workshop, and the waste sulfuric acid outlet of the anthraquinone production workshop. The discharge port of the waste acid storage tank and the discharge port of the pulping tank are respectively connected to the feed port of the neutralization tank. The anthraquinone production workshop is a 2-ethyl anthraquinone production workshop. The mill can be a Raymond mill, and the fan can be a Roots blower.

[0009] The raw gypsum filter press section comprises a vacuum filter, wherein the feed port of the vacuum filter is connected to the discharge port of the neutralization tank;

[0010] The auxiliary part includes an air compressor and a mother liquid water pool. The air compressor is connected to the pulping pool, the neutralization pool, and the vacuum filter; the liquid outlet of the vacuum filter is connected to the liquid inlet of the mother liquid water pool, and the liquid outlet of the mother liquid water pool is respectively connected to the feed inlet of the neutralization pool, the feed inlet of the pulping pool, and the sewage station.

[0011] Furthermore, the grinding and slurrying section also includes a stone powder slurry pump, which is connected to the slurrying tank and the neutralization tank through pipelines respectively, and the stone powder slurry pump is located between the slurrying tank and the neutralization tank.

[0012] Furthermore, the waste acid neutralization part also includes a waste acid self-priming pump, which is connected to the waste acid storage tank and the neutralization tank through pipelines, respectively, and the waste acid self-priming pump is located between the waste acid storage tank and the neutralization tank.

[0013] Furthermore, the waste acid neutralization section also includes a gypsum delivery pump, which is connected to the neutralization tank and the vacuum filter through pipelines, respectively, and the gypsum delivery pump is located between the neutralization tank and the vacuum filter.

[0014] Furthermore, the auxiliary part also includes an air buffer tank, the air inlet of the air buffer tank is connected to the air compressor, and the air outlet of the air buffer tank is respectively connected to the pulping tank, the neutralization tank, and the vacuum filter.

[0015] Furthermore, the auxiliary part also includes a mother liquor buffer tank, the liquid inlet of the mother liquor buffer tank is connected to the liquid outlet of the vacuum filter, and the liquid outlet of the mother liquor buffer tank is connected to the liquid inlet of the mother liquor pool.

[0016] Furthermore, the auxiliary part also includes a mother liquor pump, and the mother liquor water pool is connected to the neutralization tank, the pulping tank, and the sewage station respectively through the mother liquor pump; the mother liquor is transported from the mother liquor water pool to the neutralization tank, the pulping tank, and the sewage station through the mother liquor pump.

[0017] Furthermore, the raw gypsum filter press section also includes a cyclone, the top overflow port of the cyclone is connected to the feed port of the neutralization tank, the middle feed port of the cyclone is connected to the discharge port of the neutralization tank, and the bottom discharge port of the cyclone is connected to the feed port of the vacuum filter.

[0018] Furthermore, the stone powder bin includes a first stone powder bin and a second stone powder bin, the chemical pulping tank includes a first chemical pulping tank and a second chemical pulping tank, the first stone powder bin is connected to the first chemical pulping tank, the second stone powder bin is connected to the second chemical pulping tank, the neutralization tank includes a first neutralization tank, a second neutralization tank and a third neutralization tank, the stone powder slurry pump includes a first stone powder slurry pump, a second stone powder slurry pump and a third stone powder slurry pump, the first chemical pulping tank is connected to the second and third neutralization tanks through the first stone powder slurry pump, the second chemical pulping tank is connected to the second and third neutralization tanks through the second stone powder slurry pump, and the first chemical pulping tank and the second chemical pulping tank are connected to the first neutralization tank through the third stone powder slurry pump.

[0019] Furthermore, the waste acid storage tank includes a first waste acid storage tank and a second waste acid storage tank, and the first waste acid storage tank and the second waste acid storage tank are respectively connected to the first neutralization tank, the second neutralization tank, and the third neutralization tank through a waste acid self-priming pump; the waste acid self-priming pump includes a first waste acid self-priming pump and a second waste acid self-priming pump, and the first waste acid self-priming pump and the second waste acid self-priming pump are arranged in parallel.

[0020] Further, the gypsum delivery pump includes a first gypsum delivery pump, a second gypsum delivery pump and a third gypsum delivery pump, the first gypsum delivery pump is respectively connected to the discharge port of the first neutralization tank and the middle feed port of the cyclone, and the first gypsum delivery pump is located between the first neutralization tank and the cyclone; the second gypsum delivery pump is respectively connected to the discharge port of the second neutralization tank and the middle feed port of the cyclone, and the second gypsum delivery pump is located between the second neutralization tank and the cyclone; the third gypsum delivery pump is respectively connected to the discharge port of the first neutralization tank and the middle feed port of the cyclone, and the second gypsum delivery pump is located between the second neutralization tank and the cyclone The discharge port of the third neutralization tank is connected to the middle feed port of the cyclone, and the third gypsum delivery pump is located between the third neutralization tank and the cyclone; in addition, the first gypsum delivery pump is connected to the feed port of the first neutralization tank and the discharge port of the first neutralization tank through a pipeline; the second gypsum delivery pump is connected to the feed port of the first neutralization tank and the discharge port of the second neutralization tank through a pipeline; the third gypsum delivery pump is connected to the feed port of the first neutralization tank, the feed port of the second neutralization tank, the feed port of the third neutralization tank, and the discharge port of the third neutralization tank through a pipeline.

[0021] Furthermore, the air compressor includes a first air compressor and a second air compressor, and the air buffer tank includes a first air buffer tank, a second air buffer tank, a third air buffer tank and a fourth air buffer tank, the first air compressor is connected to the air inlet of the first air buffer tank, and the air outlet of the first air buffer tank is connected to the vacuum filter; the second air compressor is respectively connected to the second air buffer tank, the third air buffer tank and the fourth air buffer tank, and the air outlet of the fourth air buffer tank is respectively connected to the first pulping tank, the second pulping tank, the first neutralization tank, the second neutralization tank and the third neutralization tank; the condensate of the first air buffer tank, the second air buffer tank, the third air buffer tank and the fourth air buffer tank is drained to the ditch.

[0022] Further, the mother liquor buffer tank includes a first mother liquor buffer tank and a second mother liquor buffer tank, the mother liquor pump includes a first mother liquor pump, a second mother liquor pump, a third mother liquor pump and a fourth mother liquor pump, the first mother liquor buffer tank is connected to the liquid outlet of the vacuum filter press, the first mother liquor pump is respectively connected to the first mother liquor buffer tank and the second mother liquor buffer tank, and the first mother liquor pump is located between the first mother liquor buffer tank and the second mother liquor buffer tank; the second mother liquor pump is respectively connected to the second mother liquor buffer tank and the vacuum filter press, and the second mother liquor pump is located between the second mother liquor buffer tank and the vacuum filter press; the third mother liquor pump is respectively connected to the second mother liquor buffer tank and the mother liquor water pool, and the third mother liquor pump is located between the second mother liquor buffer tank and the mother liquor water pool; the mother liquor water pool is respectively connected to the first neutralization tank, the second neutralization tank, the third neutralization tank, the first pulping tank, the second pulping tank, and the sewage station through the fourth mother liquor pump.

[0023] Beneficial effects of the utility model:

[0024] The utility model comprises a grinding and slurrying section, a waste acid neutralization section and a raw gypsum filter pressing section. The grinding and slurrying section can grind limestone powder into slurry, and then send the stone powder slurry to the waste acid neutralization section. The waste acid neutralization section neutralizes the stone powder slurry with waste sulfuric acid generated in an anthraquinone workshop, and then sends the slurry to the raw gypsum filter pressing section for filtration, so as to produce raw gypsum. The waste acid comes from the waste sulfuric acid in the anthraquinone workshop, and the secondary steam generated in the anthraquinone workshop is also recycled and used, so as to achieve the purpose of resource utilization and energy saving. Before the waste acid is used, the secondary steam is introduced into the waste acid in advance to heat it so that it is kept at ≥40°C, and the fan is used to make the gas uniform. After the waste sulfuric acid is heated and pre-treated with bubbles, it can better carry out the neutralization reaction in the subsequent stage.

[0025] The utility model also includes an auxiliary part. The compressed air generated by the air compressor in the auxiliary part is sent to the pulping tank, the neutralization tank, etc. for bubbling, which can promote the reaction; the mother liquor buffer tank, the mother liquor pump, the mother liquor pool, etc. in the auxiliary part can return the mother liquor to the neutralization tank, the pulping tank, etc. for reuse, effectively improving production efficiency, protecting environment and saving energy, and reducing costs.

[0026] In summary, the utility model takes safety, environmental protection and economy into consideration, combines the actual production of 2-ethylanthraquinone, utilizes limestone powder (calcium carbonate) and waste sulfuric acid generated in the production of anthraquinone to neutralize and produce gypsum as a by-product, and provides an effectively operated industrial by-product gypsum production system, which can not only produce gypsum as a by-product in the production process of anthraquinone, but also effectively treat the waste sulfuric acid generated in the production of anthraquinone, thereby reducing the treatment cost of the waste sulfuric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the system structure of a preferred embodiment of the utility model;

[0028] Markings in the accompanying drawings: 1-first waste acid storage tank, 2-second waste acid storage tank, 21-first waste acid self-priming pump, 22-second waste acid self-priming pump, 3-first neutralization tank, 31-first gypsum delivery pump, 4-second neutralization tank, 41-second gypsum delivery pump, 5-third neutralization tank, 51-third gypsum delivery pump, 6-Roots blower, 7-stone powder hopper, 8-Raymond mill, 9-first stone powder bin, 10-second stone powder bin, 11-first pulping tank, 111-first stone powder slurry pump, 12-second pulping tank, 121-the second stone powder slurry pump, 131-the third stone powder slurry pump, 13-the vacuum filter, 14-the cyclone, 15-the first mother liquor buffer tank, 151-the first mother liquor pump, 16-the second mother liquor buffer tank, 161-the second mother liquor pump, 162-the third mother liquor pump, 17-the mother liquor pool, 171-the fourth mother liquor pump, 18-the first air compressor, 19-the second air compressor, 201-the first air buffer tank, 202-the second air buffer tank, 203-the third air buffer tank, 204-the fourth air buffer tank. DETAILED DESCRIPTION

[0029] 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 in 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.

[0030] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] Example

[0033] like Figure 1 As shown, this embodiment provides a production system for industrial by-product gypsum, including a grinding and slurrying section, a waste acid neutralization section, a raw gypsum filter press section and an auxiliary section; the details are as follows:

[0034] The grinding and slurrying section includes a stone powder hopper 7, a Raymond mill 8, a stone powder bin, a slurrying tank and a stone powder slurry pump connected in sequence;

[0035] The waste acid neutralization section includes a waste acid storage tank and a neutralization tank. The feed port of the waste acid storage tank is respectively connected to the Roots blower 6, the secondary steam outlet of the anthraquinone production workshop, and the waste sulfuric acid outlet of the anthraquinone production workshop. The discharge port of the waste acid storage tank and the discharge port of the pulping tank are respectively connected to the feed port of the neutralization tank; the anthraquinone production workshop is specifically a 2-ethyl anthraquinone production workshop. The stone powder slurry pump is respectively connected to the pulping tank and the neutralization tank through pipelines, and the stone powder slurry pump is located between the pulping tank and the neutralization tank.

[0036] In this embodiment, the stone powder bin includes a first stone powder bin 9 and a second stone powder bin 10, the Raymond mill 8 is connected to the feed port of the first stone powder bin 9 and the feed port of the second stone powder bin 10 respectively, the pulping tank includes a first pulping tank 11 and a second pulping tank 12, the discharge port of the first stone powder bin 9 is connected to the first pulping tank 11, the discharge port of the second stone powder bin 10 is connected to the second pulping tank 12, the neutralization tank includes a first neutralization tank 3, a second neutralization tank 4 and a third neutralization tank and tank 5, the stone powder slurry pump includes a first stone powder slurry pump 111, a second stone powder slurry pump 121 and a third stone powder slurry pump 131, the first pulping tank 11 is connected to the second and third neutralization tanks 4 and 5 through the first stone powder slurry pump 111, the second pulping tank 12 is connected to the second and third neutralization tanks 4 and 5 through the second stone powder slurry pump 121, and the first and second pulping tanks 11 and 12 are connected to the first neutralization tank 3 through the third stone powder slurry pump 131.

[0037] In this embodiment, the waste acid neutralization part also includes a waste acid self-priming pump, which is connected to the waste acid storage tank and the neutralization tank through pipelines, and the waste acid self-priming pump is located between the waste acid storage tank and the neutralization tank; specifically, the waste acid storage tank includes a first waste acid storage tank 1 and a second waste acid storage tank 2, and the first waste acid storage tank 1 and the second waste acid storage tank 2 are respectively connected to the first neutralization tank 3, the second neutralization tank 4, and the third neutralization tank 5 through the waste acid self-priming pump; the waste acid self-priming pump includes a first waste acid self-priming pump 21 and a second waste acid self-priming pump 22, and the first waste acid self-priming pump 21 and the second waste acid self-priming pump 22 are arranged in parallel so that they can be switched for use at any time.

[0038] In this embodiment, the raw gypsum filter press section includes a vacuum filter 13 and a cyclone 14; the top overflow port of the cyclone 14 is connected to the feed port of the first neutralization tank 3 and the feed port of the second neutralization tank 4, the middle feed port of the cyclone 14 is connected to the discharge port of the first neutralization tank 3, the discharge port of the second neutralization tank 4, and the discharge port of the third neutralization tank 5, and the bottom discharge port of the cyclone 14 is connected to the feed port of the vacuum filter 13. The top overflow port of the cyclone 14 is connected to the feed port of the first neutralization tank 3 and the feed port of the second neutralization tank 4. When in use, the slurry is filtered out of fine particles of gypsum through the cyclone 14, and returns to the first neutralization tank 3 and the second neutralization tank 4 from the top overflow port of the cyclone 14 to reduce the fine particles of gypsum entering the filter cloth of the vacuum filter 13 to cause blockage, thereby affecting the dehydration effect.

[0039] In this embodiment, the waste acid neutralization section further includes a gypsum delivery pump, which is connected to the neutralization tank and the cyclone 14 through pipelines, respectively, and is located between the neutralization tank and the cyclone 14 . Specifically, the gypsum conveying pump includes a first gypsum conveying pump 31, a second gypsum conveying pump 41 and a third gypsum conveying pump 51. The first gypsum conveying pump 31 is respectively connected to the discharge port of the first neutralization tank 3 and the middle feed port of the cyclone 14, and the first gypsum conveying pump 31 is located between the first neutralization tank 3 and the cyclone 14; the second gypsum conveying pump 41 is respectively connected to the discharge port of the second neutralization tank 4 and the middle feed port of the cyclone 14, and the second gypsum conveying pump 41 is located between the second neutralization tank 4 and the cyclone 14; the third gypsum conveying pump 51 is respectively connected to the discharge port of the third neutralization tank 5 and the middle feed port of the cyclone 14, and the third gypsum conveying pump 51 is located between the third neutralization tank 5 and the cyclone 14. In addition, the first gypsum delivery pump 31 is connected to the feed port of the first neutralization tank 3 and the discharge port of the first neutralization tank 3 through a pipeline; the second gypsum delivery pump 41 is connected to the feed port of the first neutralization tank 3 and the discharge port of the second neutralization tank 4 through a pipeline; the third gypsum delivery pump 51 is connected to the feed port of the first neutralization tank 3, the feed port of the second neutralization tank 4, the feed port of the third neutralization tank 5, and the discharge port of the third neutralization tank 5 through a pipeline; through the above settings, the circulation of each neutralization tank is opened during filter pressing to control the pump outlet pressure and return the gypsum slurry to each neutralization tank for circulation to make the reaction more uniform.

[0040] The auxiliary part includes an air compressor, an air buffer tank and a mother liquor pool 17, a mother liquor buffer tank, and a mother liquor pump. The air inlet of the air buffer tank is connected to the air compressor, and the air outlet of the air buffer tank is connected to the pulping tank, the neutralization tank, and the vacuum filter 13; the liquid inlet of the mother liquor buffer tank is connected to the liquid outlet of the vacuum filter 13, and the liquid outlet of the mother liquor buffer tank is connected to the liquid inlet of the mother liquor pool 17. The liquid outlet of the mother liquor pool 17 is respectively connected to the feed inlet of the neutralization tank, the feed inlet of the pulping tank, and the sewage station through the mother liquor pump; the mother liquor is transported from the mother liquor pool 17 to the neutralization tank, the pulping tank, and the sewage station through the mother liquor pump.

[0041] In this embodiment, the air compressor includes a first air compressor 18 and a second air compressor 19, and the air buffer tank includes a first air buffer tank 201, a second air buffer tank 202, a third air buffer tank 203 and a fourth air buffer tank 204 for storing and buffering the compressed air produced by the air compressor. The first air compressor 18 is connected to the air inlet of the first air buffer tank 201, and the air outlet of the first air buffer tank 201 is connected to the vacuum filter 13; the second air compressor 19 is respectively connected to the second air buffer tank 202, the third air buffer tank 203 and the fourth air buffer tank 204. The air buffer tank 203 is connected to the fourth air buffer tank 204, and the air outlet of the fourth air buffer tank 204 is respectively connected to the first pulping tank 11, the second pulping tank 12, the first neutralization tank 3, the second neutralization tank 4, and the third neutralization tank 5; the second air buffer tank 202 and the third air buffer tank 203 are mainly used for buffering compressed air; the condensate of the first air buffer tank 201, the second air buffer tank 202, the third air buffer tank 203, and the fourth air buffer tank 204 is discharged to the ditch.

[0042] In this embodiment, the mother liquor buffer tank includes a first mother liquor buffer tank 15 and a second mother liquor buffer tank 16 for storing and buffering the mother liquor produced by the vacuum filter press 13, and the mother liquor pump includes a first mother liquor pump 151, a second mother liquor pump 161, a third mother liquor pump 162 and a fourth mother liquor pump 171. The first mother liquor buffer tank 15 is connected to the liquid outlet of the vacuum filter press 13, and the first mother liquor pump 151 is connected to the first mother liquor buffer tank 15 and the second mother liquor buffer tank 16 respectively. The first mother liquor pump 151 is located between the first mother liquor buffer tank 15 and the second mother liquor buffer tank 16; the second mother liquor pump 1 61 are respectively connected to the second mother liquor buffer tank 16 and the vacuum filter press 13, and the second mother liquor pump 161 is located between the second mother liquor buffer tank 16 and the vacuum filter press 13; the third mother liquor pump 162 is respectively connected to the second mother liquor buffer tank 16 and the mother liquor water pool 17, and the third mother liquor pump 162 is located between the second mother liquor buffer tank 16 and the mother liquor water pool 17; the mother liquor water pool 17 is respectively connected to the first neutralization tank 3, the second neutralization tank 4, the third neutralization tank 5, the first pulping tank 11, the second pulping tank 12 and the sewage station through the fourth mother liquor pump 171.

[0043] All the above devices and components in this embodiment are provided with valves, control instruments and other accessories accordingly. The specific configuration of the above accessories is well known to those skilled in the art and will not be elaborated here.

[0044] The operation of the utility model when in use is as follows:

[0045] (1) Grinding and slurrying: The calcium carbonate particles are sent from the stone powder hopper 7 to the Raymond mill 8 via a conveyor belt for grinding to obtain stone powder. The ground stone powder is transferred to the first stone powder bin 9 and the second stone powder bin 10, and then transferred to the first pulping tank 11 and the second pulping tank 12. The mother liquor is pumped from the mother liquor pool 17 into the first pulping tank 11 and the second pulping tank 12 through the fourth mother liquor pump 171. At the same time, the compressed air of the second air compressor 19 is introduced into the fourth air buffer tank 204, and then transported to the first pulping tank 11 and the second pulping tank 12. The stone powder and the mother liquor are slurried in the pulping tank to obtain calcium carbonate slurry. The introduction of compressed air for bubbling can accelerate the slurrying speed. The calcium carbonate slurry in the first chemical pulping tank 11 is sent to the second neutralization tank 4 and the third neutralization tank 5 through the first stone powder slurry pump 111, the calcium carbonate slurry in the second chemical pulping tank 12 is sent to the second neutralization tank 4 and the third neutralization tank 5 through the second stone powder slurry pump 121, and the calcium carbonate slurries in the first chemical pulping tank 11 and the second chemical pulping tank 12 are sent to the first neutralization tank 3 through the third stone powder slurry pump 131.

[0046] (2) Neutralization of waste acid: waste sulfuric acid is transported from the anthraquinone workshop to the first waste acid storage tank 1 and the second waste acid storage tank 2. At the same time, it is necessary to heat the waste sulfuric acid in the waste acid storage tank with steam in advance to keep it at ≥40°C. The steam comes from the secondary steam in the anthraquinone workshop. In addition, the Roots blower 6 is used to blow air into the waste sulfuric acid in the waste acid storage tank and bubble it evenly to improve the subsequent reaction effect; the waste sulfuric acid in the first waste acid storage tank 1 and the second waste acid storage tank 2 is transported to the first neutralization tank 3, the second neutralization tank 4, and the third neutralization tank 5 through the first waste acid self-priming pump 21 or the second waste acid self-priming pump 22. Turn on the agitator of each neutralization tank and inject compressed air. The specific operation is to pass the compressed air of the second air compressor 19 into the fourth air buffer tank 204, and then transport it to the first neutralization tank 3, the second neutralization tank 4, and the third neutralization tank 5. This can accelerate the mixed gypsum slurry to fully react. The calcium carbonate slurry reacts with the waste sulfuric acid in each neutralization tank to obtain gypsum slurry. After the gypsum slurry reaches a neutral pH value, it is transported to the gypsum filter press by a gypsum delivery pump for dehydration.

[0047] (3) Gypsum filter press: After the neutralization reaction is qualified, the gypsum slurry is transported from the first neutralization tank 3, the second neutralization tank 4, and the third neutralization tank 5 to the cyclone 14 by the first gypsum delivery pump 31, the second gypsum delivery pump 41, and the third gypsum delivery pump 51 respectively. The gypsum slurry is then sent to the vacuum filter 13 from the bottom discharge port of the cyclone 14 for dehydration; the vacuum filter 13 is a vacuum belt filter, and the vacuum belt filter is equipped with a water ring vacuum pump for use. The first air compressor 18 is started to deliver compressed air to the first air buffer tank 201, and the first air buffer tank 201 then delivers compressed air to the vacuum filter 13. The vacuum filter 13 is started to run idle for one week, and it is confirmed that there is no abnormality. The gypsum slurry is delivered to the vacuum filter 13. , start the water ring vacuum pump to evacuate the filter cloth, the gypsum slurry enters the filter cloth of the vacuum filter 13 for dehydration, and raw gypsum is obtained after dehydration, and the mother liquor is transferred to the first mother liquor buffer tank 15, and then sent to the second mother liquor buffer tank 16 by the first mother liquor pump 151; the mother liquor in the second mother liquor buffer tank 16 is sent to the vacuum filter press 13 by the second mother liquor pump 161 to clean the filter cloth, and on the other hand, it is sent to the mother liquor pool 17 by the third mother liquor pump 162; a part of the mother liquor in the mother liquor pool 17 is sent to the first neutralization tank 3, the second neutralization tank 4, the third neutralization tank 5, the first pulping tank 11, and the second pulping tank 12 for reaction respectively through the fourth mother liquor pump 171, and the remaining part of the mother liquor is pumped to the sewage station for treatment to obtain recycled water.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A production system for industrial by-product gypsum, characterized in that: include: The grinding and pulping section includes a stone powder hopper, a grinding machine, a stone powder bin and a pulping tank connected in sequence; The waste acid neutralization section includes a waste acid storage tank and a neutralization tank, wherein the feed inlet of the waste acid storage tank is respectively connected to the fan, the secondary steam outlet of the anthraquinone production workshop, and the waste sulfuric acid outlet of the anthraquinone production workshop, and the discharge port of the waste acid storage tank and the discharge port of the pulping tank are respectively connected to the feed inlet of the neutralization tank; The raw gypsum filter press section comprises a vacuum filter, wherein the feed port of the vacuum filter is connected to the discharge port of the neutralization tank; The auxiliary part includes an air compressor and a mother liquid water pool. The air compressor is connected to the pulping pool, the neutralization pool, and the vacuum filter; the liquid outlet of the vacuum filter is connected to the liquid inlet of the mother liquid water pool, and the liquid outlet of the mother liquid water pool is respectively connected to the feed inlet of the neutralization pool, the feed inlet of the pulping pool, and the sewage station.

2. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The grinding and slurrying section also includes a stone powder slurry pump, which is connected to the slurrying tank and the neutralization tank through pipelines respectively, and the stone powder slurry pump is located between the slurrying tank and the neutralization tank.

3. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The waste acid neutralization part also includes a waste acid self-priming pump, which is connected to the waste acid storage tank and the neutralization tank through pipelines respectively, and is located between the waste acid storage tank and the neutralization tank.

4. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The waste acid neutralization section also includes a gypsum delivery pump, which is connected to the neutralization tank and the vacuum filter through pipelines, respectively, and the gypsum delivery pump is located between the neutralization tank and the vacuum filter.

5. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The auxiliary part also includes an air buffer tank, an air inlet of the air buffer tank is connected to the air compressor, and an air outlet of the air buffer tank is respectively connected to the pulping tank, the neutralization tank, and the vacuum filter.

6. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The auxiliary part also includes a mother liquid buffer tank, the liquid inlet of the mother liquid buffer tank is connected to the liquid outlet of the vacuum filter, and the liquid outlet of the mother liquid buffer tank is connected to the liquid inlet of the mother liquid water pool.

7. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The auxiliary part also includes a mother liquor pump, and the mother liquor pool is connected to the neutralization tank, the pulping tank, and the sewage station respectively through the mother liquor pump.

8. The production system of industrial by-product gypsum as claimed in claim 1, characterized in that: The raw gypsum filter press section also includes a cyclone, the top overflow port of the cyclone is connected to the feed port of the neutralization tank, the middle feed port of the cyclone is connected to the discharge port of the neutralization tank, and the bottom discharge port of the cyclone is connected to the feed port of the vacuum filter.

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