Recycling system for aluminum mud

Abstract

The utility model relates to an aluminum mud recycling system which comprises an aluminum mud collecting chamber, a reaction tank, a first settling chamber and an aluminum chloride collecting chamber which are connected in sequence, an outlet of the aluminum chloride collecting chamber is connected with an evaporator which is sequentially connected with a crystallizer and a first filter, and an outlet of the first filter is further connected with an inlet of the evaporator. The other outlet of the aluminum chloride collecting chamber is connected with a polymerization chamber which is connected with a second settling chamber, and the second settling chamber is connected with the curing chamber through a second filter. The aluminum mud recycling system can be used for preparing aluminum chloride hexahydrate crystals and liquid polyaluminum chloride at the same time, and the prepared liquid polyaluminum chloride is high in purity and wide in application range.

Description

TECHNICAL FIELD

[0001] The utility model belongs to surface treatment waste technical field, concretely relates to a kind of recovery and disposal system of aluminium mud. BACKGROUND

[0002] A large amount of aluminum sludge is generated in the surface treatment industry such as metal surface treatment and heat treatment, which causes great harm to the environment. Aluminum sludge is radioactive and can cause air pollution, groundwater pollution, and damage to building surfaces and soil. If not properly disposed of and strictly controlled, it will inevitably have a serious impact on the environment and human health.

[0003] Currently, the rational disposal of aluminum sludge has been at the laboratory stage nationwide. Except for a small amount used for building materials, most of it is discarded or buried, which not only wastes land resources but also still causes serious harm to the soil and groundwater environment. Therefore, it is of great environmental value and good application prospect to reduce, harmlessly dispose of or recycle aluminum sludge.

[0004] Chinese patent CN 107265581A discloses a method for preparing polyaluminum chloride water purifying agent from aluminum sludge. The method involves reacting the aluminum sludge to be treated with a certain amount of hydrochloric acid, then adding a certain amount of calcium aluminate and reacting for a period of time, and then adding a certain amount of aluminum powder into the reaction system and reacting for a period of time. The product is separated to obtain liquid polyaluminum chloride water purifying agent. However, this patent has the following drawbacks: (1) it does not consider the pollution of other heavy metal ions in the aluminum sludge, which affects the performance and application of the final recovery product; (2) the aluminum in the aluminum sludge is converted into liquid polyaluminum chloride water purifying agent, which has a single form of recovery product, and aluminum powder is consumed in the process, resulting in high cost; (3) the calcium aluminate contains a certain amount of iron ions, and the polyaluminum chloride solution prepared in this patent contains a high amount of iron ions, which will inevitably affect the application range of polyaluminum chloride, especially in the treatment of drinking water. SUMMARY

[0005] The utility model aims at providing a kind of recovery and disposal system of aluminium mud, can prepare six water aluminum chloride crystal and liquid polyaluminum chloride simultaneously, and the liquid polyaluminum chloride prepared has high purity, high quality and wide application range.

[0006] The utility model discloses a kind of recovery and disposal system of aluminium mud, the technical scheme adopted to solve the above problems is as follows: the recovery and disposal system includes aluminum mud collection chamber, the aluminum mud collection chamber is connected reaction tank, first settling chamber, aluminum chloride collection chamber in turn;Aluminum chloride collection chamber one outlet is connected evaporator, the evaporator is sequentially connected with crystallizer and first filter, and the first filter outlet is also connected with the evaporator inlet;Aluminum chloride collection chamber another outlet is connected with polymerization chamber, and the polymerization chamber is connected with second settling chamber, and the second settling chamber is connected with curing chamber by second filter.

[0007] Preferably, the reaction tank and the polymerization chamber are provided with stirring devices.

[0008] Preferably, the first settling chamber is further connected with a heavy metal capturing agent storage tank.

[0009] More preferably, the heavy metal capturing agent storage tank is a xanthate capturing agent storage tank.

[0010] Preferably, the second settling chamber is further connected with a settling agent storage tank.

[0011] More preferably, the settling agent storage tank is a thiosulfonate polymer, modified polyacrylamide mixture storage tank.

[0012] Preferably, the polymerization chamber is further connected with a calcium aluminate storage tank.

[0013] Preferably, the bottom of the first settling chamber and the second settling chamber are provided with a conical bottom with a conical angle of 45°.

[0014] Preferably, a filter press is further arranged between the first settling chamber and the aluminum chloride collection chamber.

[0015] Compared with the prior art, the aluminum mud recycling system has the following advantages:

[0016] The aluminum mud recycling system can obtain aluminum chloride hexahydrate crystals and liquid polyaluminum chloride, and avoid the pollution of heavy metal ions in the recycled products. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The aluminum mud recycling system is shown in the structure diagram.

[0018] Wherein: 1 is an aluminum mud collection chamber, 2 is a reaction tank, 3 is a first settling chamber, 4 is an aluminum chloride collection chamber, 5 is an evaporator, 6 is a crystallizer, 7 is a first filter, 8 is a polymerization chamber, 9 is a second settling chamber, 10 is a second filter, 11 is a curing chamber, 12 is a heavy metal capturing agent storage tank, 13 is a settling agent storage tank, 14 is a calcium aluminate storage tank, and 15 is a filter press. DETAILED DESCRIPTION

[0019] The aluminum mud recycling system is shown in the structure diagram.

[0020] As shown in the structure diagram of the aluminum mud recycling system in the embodiment. Figure 1

[0021] ​A kind of recovery processing system of aluminium mud, the recovery processing system includes aluminium mud collection chamber 1, aluminium mud collection chamber 1 is connected reaction tank 2, first sedimentation chamber 3, filter press 15, aluminium chloride collection chamber 4 in turn, first sedimentation chamber 3 is also connected heavy metal capture agent storage tank 12, and heavy metal capture agent is xanthate ester type capture agent.

[0022] One outlet of aluminium chloride collection chamber 4 is connected evaporator 5, evaporator 5 is connected crystallizer 6, first filter 7 in turn, and the outlet of first filter 7 is also connected the inlet of evaporator 5.

[0023] Another outlet of aluminium chloride collection chamber 4 is connected polymerization chamber 8, polymerization chamber 8 is connected calcium aluminate storage tank 14, polymerization chamber 8 is connected second sedimentation chamber 9, second sedimentation chamber 9 is connected ripening chamber 11 via second filter 10, and second sedimentation chamber 9 is also connected settling agent storage tank 13, and settling agent is thiosulfonate polymer, modified polyacrylamide mixture.

[0024] Wherein, stirring device is arranged in reaction tank 2 and polymerization chamber 8;The bottom of first sedimentation chamber 3 and second sedimentation chamber 9 is provided as conical bottom, and the taper angle is 45 °, which is more conducive to the separation of precipitate.

[0025] The working process of the embodiment will be described in detail below with reference to the drawings:

[0026] First, aluminium mud in aluminium mud collection chamber 1 is added to reaction tank 2, hydrochloric acid is poured into reaction tank 2 via reaction tank 2 feed port, aluminium mud and hydrochloric acid react to obtain aluminium chloride in reaction tank 2, and after reaction, reaction mixture enters first sedimentation chamber 3, heavy metal capture agent in heavy metal capture agent storage tank 12 is added to first sedimentation chamber 3, and reacts with Cu 2+ , Cd 2 + , Hg 2+ , Pb 2+ , Mn 2+ , Ni 2+ , Zn 2+ , Cr 3+ and other heavy metal ions in the mixture to generate precipitate, which is removed by filter press 15, and filtrate enters aluminium chloride collection chamber 4.

[0027] Part of aluminium chloride solution in aluminium chloride collection chamber 4 is evaporated in evaporator 5, crystallized in crystallizer 6, and filtered in first filter 7 to obtain aluminium chloride hexahydrate crystal, and the filtrate generated by filtration is returned to evaporator 5 for continuous evaporation.

[0028] The other part of the aluminum chloride solution in the aluminum chloride collecting chamber 4 enters the polymerization chamber 8 to react with calcium aluminate from the calcium aluminate storage tank 14, the reaction solution enters the second settling chamber 9 to react with the settling agent (sulfur sulfonate polymer, modified polyacrylamide mixture) from the settling agent storage tank 13 to obtain insoluble substances, then the insoluble substances are filtered by the second filter 10 to remove the iron impurities introduced by the calcium aluminate, and finally the filtrate enters the ripening chamber 11 to stand and ripen, so that the liquid polymerized aluminum chloride is obtained.

[0029] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.

Claims

1. A system for recycling treatment of aluminum sludge, characterized by: The recycling treatment system comprises an aluminum mud collecting chamber (1) connected with a reaction tank (2), a first settling chamber (3), and an aluminum chloride collecting chamber (4) in sequence; one outlet of the aluminum chloride collecting chamber (4) is connected with an evaporator (5), the evaporator (5) is sequentially connected with a crystallizer (6) and a first filter (7), and the outlet of the first filter (7) is also connected with the inlet of the evaporator (5); the other outlet of the aluminum chloride collecting chamber (4) is connected with a polymerization chamber (8), the polymerization chamber (8) is connected with a second settling chamber (9), and the second settling chamber (9) is connected with a ripening chamber (11) through a second filter (10).

2. The recovery processing system of aluminum paste according to claim 1, characterized by: The reaction tank (2) and the polymerization chamber (8) are both provided with stirring devices.

3. The recovery processing system of aluminum paste according to claim 1, characterized by: The first settling chamber (3) is further connected with a heavy metal capturing agent storage tank (12).

4. The recovery processing system of aluminum paste according to claim 1, characterized by: The second settling chamber (9) is further connected with a settling agent storage tank (13).

5. The recovery processing system of aluminum sludge according to claim 1, characterized by: The polymerization chamber (8) is further connected with a calcium aluminate storage tank (14).

6. The recovery processing system of aluminum paste according to claim 1, characterized by: The bottom of the first settling chamber (3) and the second settling chamber (9) are both provided with a conical bottom with a conical angle of 45°.

7. The recovery processing system of aluminum sludge according to claim 1, characterized by: A filter press (15) is further arranged between the first settling chamber (3) and the aluminum chloride collecting chamber (4).

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