Carbon neutralization coupling gypsum recycling system

Abstract

The utility model discloses a carbon neutralization coupling gypsum recycling system, which comprises a calcium sulfate production device, a CO2 ammonia alkali method sodium bicarbonate production device and a calcium sulfate recycling device, and the calcium sulfate production device comprises a production unit, a nanofiltration unit and an evaporation concentration unit; a sodium chloride brine inlet of the device for producing the sodium bicarbonate by the CO2 ammonia-alkali method is communicated with a sodium chloride brine outlet of the evaporation and concentration unit, and a calcium chloride wastewater discharge port of the device for producing the sodium bicarbonate by the CO2 ammonia-alkali method is communicated with a calcium chloride wastewater inlet of the production unit; the calcium sulfate recycling device is communicated with a calcium sulfate outlet of the production unit and a calcium sulfate outlet of the nanofiltration unit and is used for producing calcium sulfate related resource products. According to the utility model, the device for producing sodium bicarbonate by adopting a CO2 ammonia-alkali method is matched with the device for producing calcium sulfate, so that products with low additional value are prepared into products with high additional value under the condition of basically no discharge of waste brine.

Description

TECHNICAL FIELD

[0001] The utility model relates to calcium chloride waste brine resource utilization field, concretely relates to a system of carbon neutral coupling gypsum resource. BACKGROUND

[0002] In order to realize carbon neutral, the prior art mainly adopts carbon capture and carbon storage technology (CCUS), and the technology has technical bottlenecks in cost, energy consumption and large-scale carbon reduction.In recent years, the industry has adopted the technology of directly dissolving ore, mineralization technology of calcium carbide slag and carbon dioxide to produce calcium carbonate, but it has problems such as high energy consumption, high-salt wastewater discharge, limited market demand for products, and low added value of by-products.The traditional ammonia alkali method produces sodium bicarbonate device, which can use carbon dioxide and industrial sodium chloride brine as raw materials to produce sodium bicarbonate, but still has problems such as a large amount of calcium chloride waste brine needing subsequent zero emission treatment. UTILITY MODEL CONTENTS

[0003] Therefore, the utility model wants to solve the defects that the traditional ammonia alkali method has a large amount of calcium chloride waste brine needing zero emission treatment, and provides a system of carbon neutral coupling gypsum resource, which can solve the above problems and realize the production of high-value gypsum or its resource products.

[0004] A system of carbon neutral coupling gypsum resource, comprising a calcium sulfate production device, a CO2 ammonia alkali method sodium bicarbonate production device and a calcium sulfate resource device.

[0005] The calcium sulfate production device comprises:

[0006] A production unit has a sodium sulfate salt inlet, a calcium chloride wastewater inlet, a calcium sulfate outlet and a calcium sulfate saturated solution outlet,

[0007] A nanofiltration unit is in communication with the calcium sulfate saturated solution outlet of the production unit and has a calcium sulfate outlet and a sodium chloride solution outlet,

[0008] An evaporation and concentration unit is in communication with the sodium chloride solution outlet and has a sodium chloride outlet and a sodium chloride brine outlet.

[0009] The CO2 ammonia alkali method sodium bicarbonate production device comprises a CO2 inlet, a sodium chloride brine inlet and a calcium chloride wastewater discharge port; the sodium chloride brine inlet is in communication with the sodium chloride brine outlet of the evaporation and concentration unit, and the calcium chloride wastewater discharge port is in communication with the calcium chloride wastewater inlet of the production unit.

[0010] The calcium sulfate resource device is in communication with the calcium sulfate outlet of the production unit and the calcium sulfate outlet of the nanofiltration unit for producing calcium sulfate related resource products.

[0011] The CO2 ammonia alkali method sodium bicarbonate production device comprises:

[0012] an ammonia absorption unit comprising a CO2 inlet, a sodium chloride brine inlet, an ammonia inlet, an ammonium chloride outlet, a sodium bicarbonate outlet, the sodium chloride brine inlet being in communication with the sodium chloride brine outlet of the evaporation concentration unit;

[0013] an ammonia removal unit comprising an ammonium chloride inlet, a calcium hydroxide inlet, a calcium chloride solution outlet, an ammonia outlet, the ammonia outlet of the ammonia removal unit being in communication with the ammonia inlet of the ammonia absorption unit, the calcium chloride solution outlet being in communication with the calcium chloride wastewater inlet of the production unit;

[0014] a carbonation unit comprising an ammonia inlet in communication with the ammonia outlet of the ammonia removal unit, a CO2 inlet, a calcium chloride solution inlet in communication with the calcium chloride solution outlet of the ammonia removal unit, a calcium carbonate outlet, an ammonium chloride outlet, the ammonium chloride outlet of the carbonation unit being in communication with the ammonium chloride inlet of the ammonia removal unit.

[0015] the CO2-ammonia-soda process sodium bicarbonate production device further comprises a purification device in communication with the calcium carbonate outlet of the carbonation unit;

[0016] and / or, the CO2-ammonia-soda process sodium bicarbonate production device further comprises a filtered alkali unit in communication with the sodium bicarbonate outlet of the ammonia absorption unit.

[0017] the CO2-ammonia-soda process sodium bicarbonate production device further comprises a calcium hydroxide inlet in communication with a carbide slag pulping unit.

[0018] the calcium sulfate resource utilization device comprises:

[0019] a first filtration unit in communication with the calcium sulfate outlet of the production unit; and / or, an evaporation crystallization unit in communication with the calcium sulfate outlet of the nanofiltration unit.

[0020] the calcium sulfate resource utilization device further comprises a mixing unit, a dewatering unit, a granulation unit, a gasification reduction unit, a cooling unit, a hydrolysis carbonation unit, a second filtration unit, a separation unit in sequence, the hydrolysis carbonation unit is further connected with a sulfur production unit; the mixing unit is in communication with the first filtration unit and / or evaporation crystallization unit.

[0021] a gas outlet of the gasification reduction unit is sequentially connected with a secondary combustion unit, a waste heat boiler, a desulfurization nanofiltration unit, a gas outlet of the desulfurization nanofiltration unit is in communication with a gas inlet of the hydrolysis carbonation unit.

[0022] a fuel gas inlet of the gasification reduction unit is connected with a biomass adiabatic unit.

[0023] a biomass inlet of the mixing unit is further connected with a biomass crushing unit.

[0024] The calcium sulfate production device further comprises a sodium sulfate pretreatment unit connected to the sodium sulfate salt inlet of the production unit.

[0025] The technical scheme of the utility model has the following advantages:

[0026] 1. The system for carbon neutralization coupled with gypsum resource utilization provided by the utility model, comprising a CO2 ammonia alkali method sodium bicarbonate production device, a calcium sulfate production device and a calcium sulfate resource utilization device; wherein the calcium sulfate production device comprises: a production unit, having a sodium sulfate salt inlet, a calcium chloride wastewater inlet, a calcium sulfate outlet, a calcium sulfate saturated solution outlet, a nanofiltration unit, in communication with the calcium sulfate saturated solution outlet of the production unit, having a calcium sulfate outlet and a sodium chloride solution outlet, an evaporation and concentration unit, in communication with the sodium chloride solution outlet, having a sodium chloride outlet and a sodium chloride brine outlet; the CO2 ammonia alkali method sodium bicarbonate production device comprises a CO2 inlet, a sodium chloride brine inlet and a calcium chloride wastewater discharge port; the sodium chloride brine inlet is in communication with the sodium chloride brine outlet of the evaporation and concentration unit, and the calcium chloride wastewater discharge port is in communication with the calcium chloride wastewater inlet of the production unit; the calcium sulfate resource utilization device is in communication with the calcium sulfate outlet of the production unit and the calcium sulfate outlet of the nanofiltration unit for producing calcium sulfate related resource products. The CO2 ammonia alkali method sodium bicarbonate production device in the utility model utilizes CO2 and sodium chloride brine to produce sodium bicarbonate products, realizing carbon neutralization; a large amount of calcium chloride waste brine generated by the CO2 ammonia alkali method sodium bicarbonate production device is recycled to the calcium sulfate production device, the optimized calcium sulfate production device is utilized to react the large amount of calcium chloride waste brine with sodium sulfate salt by-produced in the industrial wastewater zero discharge project to produce calcium sulfate, the high concentration sodium chloride brine of the evaporation and concentration unit in the calcium sulfate production device can be sent to the CO2 ammonia alkali method sodium bicarbonate production device as a sodium source for recycling, avoiding the discharge of high concentration waste brine and the subsequent zero discharge treatment of high concentration waste brine; the calcium sulfate production device is utilized to further treat the calcium sulfate produced by the calcium sulfate production device to produce gypsum or gypsum related resource products, such as calcium sulfide, sulfur and calcium carbonate; therefore, the system of the utility model can effectively produce calcium sulfate (gypsum) or high value-added chemical products such as calcium sulfide, calcium carbonate and sulfur while treating low value-added by-products CO2, calcium chloride wastewater and sodium sulfate salt. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0028] Figure 1 is a structural schematic diagram of the system in the utility model;

[0029] Reference signs:

[0030] 1-CO2 ammonia alkali method production sodium bicarbonate device, 2-calcium sulfate production device, 3-calcium sulfate resource device;

[0031] 11-absorbing ammonia unit, 12-deammoniation unit, 13-carbonization unit, 14-purification device, 15-alkali filtration unit, 16-carbide slag pulping unit;

[0032] 21-production unit, 22-nanofiltration unit, 23-evaporation concentration unit, 24-sodium sulfate pretreatment unit;

[0033] 301-first filtration unit, 302-evaporation crystallization unit, 303-mixing unit, 304-dewatering unit, 305-granulation unit, 306-gasification reduction unit, 307-cooling unit, 308-hydrolysis carbonization unit, 309-second filtration unit, 310-separation unit, 311-sulfur production unit, 312-biomass adiabatic unit, 313-secondary combustion unit, 314-heat recovery boiler, 315-desulfurization nanofiltration unit, 316-biomass crushing unit. DETAILED DESCRIPTION

[0034] The following examples are provided to better further understand the utility model, and are not limited to the best mode, and do not constitute a limitation on the content and protection scope of the utility model, and any person under the enlightenment of the utility model or the combination of the utility model and other prior art features obtains any product same or similar to the utility model, falls within the protection scope of the utility model.

[0035] In the description of the utility model, it should be explained that the terms "side", "upper", "lower", "top", "bottom", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] A carbon-neutral system coupled with gypsum resource utilization, such as Figure 1 As shown, the system includes a CO2 ammonia-soda process sodium bicarbonate production unit 1, a calcium sulfate production unit 2, and a calcium sulfate resource recovery unit 3. The CO2 ammonia-soda process sodium bicarbonate production unit 1 is equipped with an ammonia absorption unit 11, an ammonia removal unit 12, a carbonization unit 13, and a purification unit 14. The calcium sulfate production unit 2 is equipped with a sodium sulfate pretreatment unit 24, a production unit 21, a nanofiltration unit 22, and an evaporation and concentration unit 23. The calcium sulfate resource recovery unit 3 is equipped with a first filtration unit 301 and an evaporation and crystallization unit 302. The calcium sulfate resource recovery unit 3 may also include a mixing unit 303, a dehydration unit 304, a granulation unit 305, a gasification reduction unit 306, a cooling unit 307, a hydrolysis and carbonization unit 308, a second filtration unit 309, a separation unit 310, a sulfur production unit 311, a biomass insulation unit 312, a secondary combustion unit 313, a waste heat boiler 314, a desulfurization nanofiltration unit 315, and a biomass pulverization unit 316, etc.

[0040] Specifically, the calcium sulfate production unit 21 has a sodium sulfate inlet, a calcium chloride wastewater inlet, a calcium sulfate outlet, and a calcium sulfate saturated solution outlet; the nanofiltration unit 22 has a calcium sulfate outlet and a sodium chloride solution outlet; and the evaporation and concentration unit 23 has a sodium chloride outlet and a sodium chloride brine outlet. The inlet of the nanofiltration unit 22 is connected to the calcium sulfate saturated solution outlet of the production unit 21, and the inlet of the evaporation and concentration unit 23 is connected to the sodium chloride solution outlet of the nanofiltration unit 22.

[0041] The calcium sulfate production device 2 of this utility model may also include a sodium sulfate pretreatment unit 24 connected to the sodium sulfate inlet of the production unit 21. The sodium sulfate pretreatment unit 24 can dissolve and remove impurities from the dry sodium sulfate salt by-product of the zero-discharge project of industrial wastewater to produce concentrated sodium sulfate brine, making it more suitable for the reaction of the production unit 21.

[0042] As one of the setting modes, the CO2 ammonia alkali method sodium bicarbonate production device 1 includes a CO2 inlet, a sodium chloride brine inlet, and a calcium chloride wastewater discharge port; the sodium chloride brine inlet is communicated with the sodium chloride brine outlet of the evaporation and concentration unit 23, and the calcium chloride wastewater discharge port is communicated with the calcium chloride wastewater inlet of the production unit 21; the calcium sulfate resourceization device 3 is communicated with the calcium sulfate outlet of the production unit 21 and the calcium sulfate outlet of the nanofiltration unit 22 for producing calcium sulfate related resource products.

[0043] As another setting mode, the CO2 ammonia alkali method sodium bicarbonate production device 1 includes an ammonia absorption unit 11, an ammonia removal unit 12, and a carbonization unit 13. Among them, the ammonia absorption unit 11 includes a CO2 inlet, a sodium chloride brine inlet, an ammonia inlet, an ammonium chloride outlet, and a sodium bicarbonate outlet, and the sodium chloride brine inlet is communicated with the sodium chloride brine outlet of the evaporation and concentration unit 23; the ammonia removal unit 12 includes an ammonium chloride inlet, a calcium hydroxide inlet, a calcium chloride solution outlet, and an ammonia outlet, and the ammonia outlet of the ammonia removal unit 12 is communicated with the ammonia inlet of the ammonia absorption unit 11, and the calcium chloride solution outlet is communicated with the calcium chloride wastewater inlet of the production unit 21; the carbonization unit 13 includes an ammonia inlet communicated with the ammonia outlet of the ammonia removal unit 12, a CO2 inlet, a calcium chloride solution inlet communicated with the calcium chloride solution outlet of the ammonia removal unit 12, a calcium carbonate outlet, and an ammonium chloride outlet, and the ammonium chloride outlet of the carbonization unit 13 is communicated with the ammonium chloride inlet of the ammonia removal unit 12. Through the recycling of ammonia in the ammonia absorption unit 11, the ammonia removal unit 12 and the carbonization unit 13, the purpose of producing sodium bicarbonate by CO2 ammonia alkali method is achieved, at the same time, a large amount of calcium chloride solution produced by the CO2 ammonia alkali method sodium bicarbonate production device 1 is returned to the production unit 21 of the calcium sulfate production device 2 for utilization and production of the required sodium chloride solution in the CO2 ammonia alkali method sodium bicarbonate production device 1, realizing zero discharge of salt solution, and the effect is remarkable.

[0044] Further, the CO2 ammonia alkali method sodium bicarbonate production device 1 also includes a purification device 14 communicated with the calcium carbonate outlet of the carbonization unit 13; through the setting of the purification device 14, the clarified filtration of the calcium carbonate related products treated by the carbonization unit 13 can also be effectively realized to prepare green building materials.

[0045] Further, the CO2 ammonia alkali method sodium bicarbonate production device 1 can also include a filtered alkali unit 15 communicated with the sodium bicarbonate outlet of the ammonia absorption unit 11. The filtered alkali unit 15 filters the sodium bicarbonate related products discharged from the sodium bicarbonate outlet of the ammonia absorption unit 11 to obtain product sodium bicarbonate.

[0046] Further, the calcium hydroxide entering the deamination unit 12 can directly use the raw material calcium hydroxide slurry, or can be prepared by the calcium carbide slag pulping unit; that is, the CO2 ammonia alkali method sodium bicarbonate production device 1 further comprises a calcium carbide slag pulping unit 16 in communication with the calcium hydroide inlet, and the calcium carbide slag pulping unit can utilize the low-value-added product calcium carbide slag to be converted into high-value-added sodium bicarbonate product in the CO2 ammonia alkali method sodium bicarbonate production device 1, which is more efficient.

[0047] The calcium sulfate product produced by the calcium sulfate production device 2 in the utility model can be prepared into gypsum by the calcium sulfate resource device 3, and the prepared gypsum can be further processed to obtain high-value-added calcium sulfide, sulfur, calcium carbonate and other products. The calcium sulfate resource device 3 for preparing gypsum is disclosed in the embodiment; specifically, the calcium sulfate resource device 3 comprises a first filtering unit 301 and / or an evaporation crystallization unit 302; the first filtering unit 301 is in communication with the calcium sulfate outlet of the production unit 21 and can further filter the calcium sulfate related products obtained by the production unit 21, thereby obtaining the required gypsum product; the evaporation crystallization unit 302 is in communication with the calcium sulfate outlet of the nanofiltration unit 22 and can further nanofiltrate the calcium sulfate related products obtained by the nanofiltration unit 22, separate the calcium sulfate and sodium chloride, and obtain the required gypsum product after the calcium sulfate concentrated solution is evaporated and crystallized to produce calcium sulfate.

[0048] The implementation process of the embodiment is as follows: the sodium sulfate concentrated brine and the calcium chloride wastewater generated by the CO2 ammonia alkali method sodium bicarbonate production device are reacted in the production unit 21 of the calcium sulfate production device to produce calcium sulfate slurry, the solid in the calcium sulfate slurry is dewatered by pressure filtration in the calcium sulfate resource device to obtain the high-value-added product gypsum related to calcium sulfate; the saturated solution of the remaining calcium sulfate in the production unit 21 is separated into divalent salt and monovalent salt by the nanofiltration unit 22, the divalent salt solution enters the calcium sulfate resource device to produce calcium sulfate by evaporation crystallization, the monovalent salt solution is sent to the evaporation concentration unit 23 for concentration, a small amount of sodium chloride product is produced, and the concentrated solution is sent to the CO2 ammonia alkali method sodium bicarbonate production device as a raw material for use as a sodium salt.

[0049] The monovalent salt (sodium chloride) concentrated solution generated by the calcium sulfate production device 2 enters the ammonia absorption unit 11 to react (NaCL+CO2+NH3+H2O=NaHCO3↓+NH4Cl), generates NH4Cl solution, and then enters the deamination unit 12 to react (Ca(OH)2+2NH4Cl=(heating)CaCl2+2H2O+2NH3↑), and then enters the carbonization unit 13 to react (CaCl2+CO2+2NH3+H2O=CaCO3↓+2NH4Cl), and finally produces sodium bicarbonate and calcium carbonate.

[0050] Example 2

[0051] A system for carbon neutralization and gypsum resourceization, which differs from the system of embodiment 1 in that the calcium sulfate resourceization device 3 is arranged differently, and the specific arrangement of the calcium sulfate resourceization device 3 is as follows:

[0052] The calcium sulfate resourceization device 3 further comprises a mixing unit 303, a dewatering unit 304, a granulation unit 305, a gasification reduction unit 306, a cooling unit 307, a hydrolysis carbonization unit 308, a second filtration unit 309, a separation unit 310, and a sulfur production unit 311.

[0053] The first filtration unit 301 is in communication with the calcium sulfate outlet of the production unit 21, the evaporation crystallization unit 302 is in communication with the calcium sulfate outlet of the nanofiltration unit 22, the outlet of the first filtration unit 301 and / or the evaporation crystallization unit 302 is in communication with the inlet of the mixing unit 303, and a biomass inlet is further arranged on the mixing unit 303, which can be directly in communication with a biomass storage tank or in communication with a biomass crushing unit 316. The biomass storage tank can directly provide crushed biomass to the mixing unit 303, or the biomass can be crushed by the biomass crushing unit 316 and then provided to the mixing unit 303. In this embodiment, the biomass crushing unit 316 is connected to the mixing unit 303.

[0054] The sulfur production unit 311 is in communication with the sulfur outlet of the hydrolysis carbonization unit 308, the gas outlet of the gasification reduction unit 306 is sequentially connected with a secondary combustion unit 313, a waste heat boiler 314, and a desulfurization nanofiltration unit 315, and the gas outlet of the desulfurization nanofiltration unit 315 is in communication with the gas inlet of the hydrolysis carbonization unit 308. The fuel gas inlet of the gasification reduction unit 306 is connected with a biomass adiabatic unit 312, and the biomass adiabatic unit 312 and the gasification reduction unit 306 can be combined and arranged as a one-furnace two-stage design. The tail gas of the gasification reduction unit 306 is arranged with a waste heat boiler and a desulfurization nanofiltration unit 315 for waste heat recovery and tail gas treatment. The biomass inlet of the mixing unit 303 is further connected with a biomass crushing unit 316.

[0055] The calcium sulfate produced in the calcium sulfate resource device 3 and the broken biomass are sequentially mixed in a mixing unit 303, dehydrated in a dehydration unit 304, and granulated in a granulation unit 305, and then calcined by using the high-temperature flue gas generated by the biomass adiabatic unit 312. When the high-temperature flue gas enters the gasification reduction unit 306, the high-temperature flue gas generated by the biomass is used to calcine the calcium sulfate in the furnace of the gasification reduction unit 306 to cause a reduction reaction. After the reaction is completed, solid calcium sulfide with high added value is produced by a cooling unit 307. The solid calcium sulfide is packaged to obtain the product calcium sulfide. The remaining material enters the hydrolysis carbonization unit 308 to react under heating to produce sulfur and calcium carbonate. The sulfur enters the sulfur production unit 311 to produce high-value-added product sulfur. The calcium carbonate produced by the hydrolysis carbonization unit 308 is filtered by a second filtration unit 309 and separated by a separation unit 310 to obtain high-value-added product calcium carbonate.

[0056] The calcium sulfate resource device 3 uses biomass as a reducing agent to produce calcium sulfide by calcination with the high-temperature flue gas generated by the biomass adiabatic unit 312. The steam generated by the waste heat boiler is used to supply steam to the ammonia removal unit 12 in the CO2 ammonia soda process for producing sodium bicarbonate device. The tail gas of the desulfurization nanofiltration unit 315 is used to heat the hydrolysis carbonization unit 308 by using the waste heat. By reasonably using high and low heat energy, the purpose of fully saving energy is achieved.

[0057] Obviously, the above embodiments are merely examples for clearly illustrating, but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A system for carbon neutralization coupled with gypsum resource utilization, characterized in that, The device comprises a CO2 ammonia alkali method sodium bicarbonate production device (1), a calcium sulfate production device (2), and a calcium sulfate resource utilization device (3). The calcium sulfate production device (2) comprises: a production unit (21) having a sodium sulfate salt inlet, a calcium chloride wastewater inlet, a calcium sulfate outlet, and a calcium sulfate saturated solution outlet, a nanofiltration unit (22) in communication with the calcium sulfate saturated solution outlet of the production unit (21) and having a calcium sulfate outlet and a sodium chloride solution outlet, an evaporation and concentration unit (23) in communication with the sodium chloride solution outlet and having a sodium chloride outlet and a sodium chloride brine outlet. The CO2 ammonia alkali method sodium bicarbonate production device (1) comprises a CO2 inlet, a sodium chloride brine inlet, and a calcium chloride wastewater discharge outlet; the sodium chloride brine inlet is in communication with the sodium chloride brine outlet of the evaporation and concentration unit (23), and the calcium chloride wastewater discharge outlet is in communication with the calcium chloride wastewater inlet of the production unit (21). The calcium sulfate resource utilization device (3) is in communication with the calcium sulfate outlet of the production unit (21) and the calcium sulfate outlet of the nanofiltration unit (22) for producing calcium sulfate related resource products.

2. The system of claim 1, wherein, The CO2 ammonia alkali method sodium bicarbonate production device (1) comprises: an ammonia absorption unit (11) comprising a CO2 inlet, a sodium chloride brine inlet, an ammonia inlet, an ammonium chloride outlet, and a sodium bicarbonate outlet; the sodium chloride brine inlet is in communication with the sodium chloride brine outlet of the evaporation and concentration unit (23); an ammonia removal unit (12) comprising an ammonium chloride inlet, a calcium hydroxide inlet, a calcium chloride solution outlet, and an ammonia outlet; the ammonia outlet of the ammonia removal unit (12) is in communication with the ammonia inlet of the ammonia absorption unit (11), and the calcium chloride solution outlet is in communication with the calcium chloride wastewater inlet of the production unit (21); a carbonization unit (13) comprising an ammonia inlet in communication with the ammonia outlet of the ammonia removal unit (12), a CO2 inlet, a calcium chloride solution inlet in communication with the calcium chloride solution outlet of the ammonia removal unit (12), a calcium carbonate outlet, and an ammonium chloride outlet; the ammonium chloride outlet of the carbonization unit (13) is in communication with the ammonium chloride inlet of the ammonia removal unit (12).

3. The system of claim 2, wherein, The CO2 ammonia alkali method sodium bicarbonate production device (1) further comprises a purification device (14) in communication with the calcium carbonate outlet of the carbonization unit (13); and / or, the CO2 ammonia alkali method sodium bicarbonate production device (1) further comprises a filter alkali unit (15) in communication with the sodium bicarbonate outlet of the ammonia absorption unit (11).

4. The system of claim 2, wherein, The CO2 ammonia alkali method sodium bicarbonate production device (1) further comprises a carbide slag pulping unit (16) in communication with the calcium hydroxide inlet.

5. The system according to any of claims 1-4, characterized in that, The calcium sulfate resource utilization device (3) comprises: a first filtration unit (301) in communication with the calcium sulfate outlet of the production unit (21); and / or, an evaporation and crystallization unit (302) in communication with the calcium sulfate outlet of the nanofiltration unit (22).

6. The system of claim 5, wherein, The calcium sulfate resource device (3) further comprises a mixing unit (303), a dehydration unit (304), a granulation unit (305), a gasification reduction unit (306), a cooling unit (307), a hydrolysis carbonization unit (308), a second filtration unit (309), and a separation unit (310) which are sequentially connected in communication, and the hydrolysis carbonization unit (308) is further connected with a sulfur production unit (311); the mixing unit (303) is in communication with the first filtration unit (301) and / or the evaporation crystallization unit (302).

7. The system of claim 6, wherein, A secondary combustion unit (313), a waste heat boiler (314), and a desulfurization nanofiltration unit (315) are sequentially connected to a gas outlet of the gasification reduction unit (306), and a gas outlet of the desulfurization nanofiltration unit (315) is in communication with a gas inlet of the hydrolysis carbonization unit (308).

8. The system of claim 6 or 7, wherein, A biomass adiabatic unit (312) is connected to a fuel gas inlet of the gasification reduction unit (306).

9. The system of claim 6 or 7, wherein, A biomass crushing unit (316) is further connected to a biomass inlet of the mixing unit (303).

10. The system of claim 1, wherein, The calcium sulfate production device (2) further comprises a sodium sulfate pretreatment unit (24) connected to a sodium sulfate salt inlet of the production unit (21).

Images