Method for resourceful treatment of molten salt chlorination waste residues by using sodium aluminate and sodium carbonate

Abstract

The invention discloses a method for resourceful treatment of molten salt chlorination waste residues by using sodium aluminate and sodium carbonate, which comprises the following steps: step 1, carrying out solid-liquid separation on the molten salt chlorination waste residues discharged from a furnace to obtain filter residues A and filtrate A, and returning the filter residues A to the furnace for reuse; step 2, placing the filtrate A in a heated converter for heat preservation, and introducing compressed air into the converter to obtain filtrate B; step 3, adding a set amount of sodium aluminate and sodium carbonate into the filtrate B to obtain a mixed solution, then carrying out heating and heat preservation on the mixed solution, reacting to generate a precipitate, and then carrying out solid-liquid separation on the mixed solution with the precipitate to obtain a filter residue B and filtrate C mainly comprising sodium chloride molten salt; 4, the filtrate C is returned to the furnace for reuse, the filter residues B are pretreated, then solid-liquid separation is conducted, and a solution D and filter residues C are obtained. The molten salt chlorination cost can be remarkably reduced, the overall economic benefit is improved, and environmental protection is promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of waste residue resource treatment, and specifically relates to a method for resource treatment of molten salt chlorination waste residue by using sodium aluminate and sodium carbonate. Background Art

[0002] At present, foreign countries usually bury molten salt chlorination waste residue in abandoned mines, or spread it on wasteland alternately with lime; domestically, lime is usually used for mixing and neutralization before being piled in the slag field. Molten salt chlorination waste residue has a complex composition, with the main molten salt phase being sodium chloride (NaCl), and containing a variety of chlorides, unreacted oxides and coke, etc. Among them, chlorides such as calcium chloride (CaCl2) and magnesium chloride (MgCl2) are mixed with sodium chloride, making it difficult to recycle and treat. Therefore, these methods all have potential pollution risks, such as groundwater pollution and soil salinization, and have failed to fundamentally solve the problem. In addition, the above-mentioned treatment methods are wasteful and do not recycle the useful substances in the molten salt chlorination waste residue.

[0003] In view of this, the inventors provide a method for resource-based treatment of molten salt chlorination waste slag using sodium aluminate and sodium carbonate to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and propose a method for resource-based treatment of molten salt chlorination waste residue using sodium aluminate and sodium carbonate. The method selects sodium aluminate and sodium carbonate as curing agents and combines specific heating temperature and insulation time to resource-based treatment of molten salt chlorination waste residue, thereby ensuring that environmental pollution is reduced while saving resources.

[0005] Specifically, the impurities calcium and magnesium in the molten salt chlorination waste residue are reacted with sodium aluminate and sodium carbonate to generate high-melting point and high-density particles, and the impurity phase finally realizes a calcium and magnesium high-melting point and high-density salt phase through nucleation, growth and precipitation, and combined with solid-liquid separation, the impurities are separated to obtain a new molten salt (filtrate C), and the new molten salt is circulated into the molten salt chlorination process. The filter residue B is washed, allowed to stand and clarified to obtain a sodium chloride melt and calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and their decomposition products calcium oxide and magnesium oxide used as refractory materials, cement, steelmaking desulfurizer or roadbed paving materials.

[0006] The chemical reactions mainly involved in the present invention are as follows:

[0007] CaCl2+2NaAlO2=2NaCl+Ca(AlO2)2↓

[0008] MgCl2+2NaAlO2=2NaCl+Mg(AlO2)2↓

[0009] CaCl2+Na2CO3=CaCO3↓+2NaCl

[0010] MgCl2+Na2CO3=MgCO2↓+2NaCl

[0011] CaCO3=CaO+CO2↑

[0012] MgCO3=MgO+CO2↑

[0013] In order to achieve the above object, the present invention adopts the following technical solutions:

[0014] The present invention provides a method for resource-based treatment of molten salt chlorination waste residue by using sodium aluminate and sodium carbonate, comprising the following steps:

[0015] Step 1, performing solid-liquid separation on the molten salt chlorination waste residue after being discharged from the furnace to obtain filter residue A and filtrate A, and returning the filter residue A to the furnace for reuse;

[0016] Step 2, placing the filtrate A in a converter with a heating temperature of 590° C. to 690° C. for 50 to 150 minutes, and introducing compressed air into the converter at a set pressure to remove volatile components such as manganese chloride, ferrous chloride, aluminum chloride, silicon tetrachloride, and titanium tetrachloride in the filtrate A to obtain filtrate B; it should be noted that after the compressed air is introduced, the air forms a large number of bubbles in the filtrate A, and these bubbles will cause violent agitation of the liquid during the rising process, greatly increasing the gas-liquid contact area and contact time, making the reaction more complete and easier to remove the volatile components;

[0017] Step 3, adding a set amount of sodium aluminate and sodium carbonate to the filtrate B to obtain a mixed solution, then heating and heat-insulating the mixed solution to generate a precipitate after reaction, and then performing solid-liquid separation on the mixed solution generating the precipitate to obtain a filter residue B and a filtrate C mainly composed of sodium chloride molten salt;

[0018] Step 4: Return the filtrate C to the furnace for reuse, pretreat the filter residue B, and then perform solid-liquid separation to obtain a solution D mainly composed of NaCl and a filter residue C used as a roadbed paving material, a refractory material, cement or a steelmaking desulfurizer, which mainly contains calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and carbonate decomposition products such as calcium oxide and magnesium oxide.

[0019] Furthermore, in step 1, the filter residue A includes a mixture of TiO2, coke powder and SiO2.

[0020] Furthermore, in step 2, the set pressure is 0.01 MPa to 1.5 MPa.

[0021] Furthermore, in step 3, the amount of sodium aluminate and sodium carbonate added is adjusted according to the sampling and analysis results of the waste slag in the chlorination furnace (or according to the analysis results of the waste slag in the previous furnace), and the amount of sodium aluminate and sodium carbonate added is adjusted according to the Ca content in the sample. 2+Mg 2+ The mass percentage of ions X, Y (%) is used to calculate the addition amount of curing agent sodium aluminate and sodium carbonate in the high temperature conversion process. Specifically, the calculation formula is as follows:

[0022] W=W1+W2 (1)

[0023] in,

[0024] In formula (2), W1 is the amount of sodium aluminate added, kg; 1.05 is the excess coefficient of sodium aluminate; 1000 is the calculation base number of the mass of molten salt chlorination waste slag, which is 1000 kg; 164 is the molar mass of sodium aluminate, g / mole; 40 is the molar mass of calcium ions, g / mole; 24.3 is the molar mass of magnesium ions, g / mole; X is the mass percentage of calcium ions in the molten salt chlorination waste slag, %; Y is the mass percentage of magnesium ions in the molten salt chlorination waste slag, %; A is the mass fraction of sodium aluminate, %; M is the mass of the molten salt chlorination waste slag, kg;

[0025]

[0026] In formula (3), W2 is the amount of sodium carbonate added, kg; 1.05 is the excess coefficient of sodium carbonate; 106 is the molar mass of sodium carbonate, g / mole; and B is the mass fraction of sodium carbonate, %.

[0027] Furthermore, in step 3, the heating and heat preservation process includes: first heating the mixed solution to 720°C to 850°C, keeping it warm for 30min to 120min, and then heating it to 880°C to 960°C, keeping it warm for 15min to 120min; wherein, compressed air is continuously introduced during the heating and heat preservation process.

[0028] It should be noted that the high-temperature conversion process of sodium carbonate is carried out at 720°C to 850°C, and the high-temperature conversion process of sodium aluminate is carried out at 880°C to 960°C.

[0029] Furthermore, in step 3, the filtrate B includes calcium chloride and magnesium chloride, and the calcium chloride and magnesium chloride react with sodium aluminate and sodium carbonate after heating and heat preservation to generate a precipitate, and the precipitate includes calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and their decomposition products calcium oxide and magnesium oxide.

[0030] Furthermore, in step 4, the pretreatment process includes sequentially washing, standing and clarifying the filter residue B.

[0031] Furthermore, in step 1, step 3 and step 4, the solid-liquid separation method adopts pressure filtration, vacuum filtration or centrifugal separation.

[0032] Furthermore, in step 1, step 3 and step 4, the medium for solid-liquid separation is a steel mesh or a ceramic filter plate.

[0033] Furthermore, the ceramic filter plate is an alumina ceramic filter plate or a zirconia ceramic filter plate with a pore size of 5ppi to 800ppi.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention discloses a method for resource-based treatment of molten salt chlorination waste residue with sodium aluminate and sodium carbonate, wherein the molten salt chlorination waste residue is first subjected to solid-liquid separation, and available filter residue A is extracted and recovered, and then filtrate A is subjected to high-temperature treatment, and volatile components such as manganese chloride, ferrous chloride, aluminum chloride, silicon tetrachloride, and titanium tetrachloride in the filtrate A are removed to obtain filtrate B, and then sodium aluminate and sodium carbonate are added to the filtrate B for high-temperature conversion, wherein the sodium aluminate and sodium carbonate react with the impurities calcium and magnesium in the molten salt chlorination waste residue at the same time, and filter residue B and filtrate C which can be recycled are further obtained by solid-liquid separation, and finally filter residue B is treated by water dissolution and hydrolysis, and finally recyclable NaCl solution and calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and their decomposition products calcium oxide and magnesium oxide are obtained. The resource-based treatment method of the present invention has high production efficiency, can significantly reduce the cost of molten salt chlorination, improve overall economic benefits and promote environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0038] Figure 1 The present invention is a flow chart of the method for resource-based treatment of molten salt chlorination waste residue. DETAILED DESCRIPTION

[0039] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0040] Example 1

[0041] See also Figure 1 This embodiment provides a method for treating molten salt chlorination waste residue by using sodium aluminate and sodium carbonate as resources, comprising the following steps:

[0042] Step 1, filtering the molten salt chlorination waste residue discharged from the chlorination furnace by pressure filtration, the filter medium is a steel wire mesh, and obtaining a filter residue A and a filtrate A, wherein the filter residue A is a mixture of TiO2, coke powder and SiO2, and the filter residue A is recycled and the filtrate A is to be treated;

[0043] Step 2, placing the filtrate A in a converter at a heating temperature of 590° C. for 150 minutes, and introducing compressed air at a pressure of 0.01 MPa into the converter to remove volatile components such as manganese chloride, ferrous chloride, aluminum chloride, silicon tetrachloride, titanium tetrachloride, etc. in the filtrate A to obtain filtrate B;

[0044] Step 3, adding a set amount of anhydrous sodium aluminate and sodium carbonate to the filtrate B to obtain a mixed solution, then heating and heat-insulating the mixed solution to generate a precipitate after the reaction, and then filtering the mixed solution with the precipitate by pressure filtration, the filter medium is an alumina filter plate with a pore size of 5 ppi, to obtain a filter residue B and a filtrate C mainly composed of sodium chloride molten salt;

[0045] The heating and heat preservation process is as follows: firstly, the mixed solution is heated to 720°C, kept warm for 120 minutes, and then heated to 880°C, kept warm for 120 minutes, so that sodium aluminate and sodium carbonate react fully with calcium chloride and magnesium chloride to generate high melting point insoluble substances calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and their decomposition products calcium oxide and magnesium oxide;

[0046] It should be noted that this process requires continuous charging of compressed air.

[0047] Specifically, in this embodiment, the addition amount W of anhydrous sodium aluminate and sodium carbonate is based on the Ca content in the sampled sample of the chloride molten salt waste. 2+ Mg 2+ The mass percentage of ions X, Y (%) is calculated using the following formula:

[0048] W=W1+W2 (1)

[0049] in,

[0050] In formula (2), W1 is the amount of sodium aluminate added, kg; 1.05 is the excess coefficient of sodium aluminate; 1000 is the calculation base number of the mass of molten salt chlorination waste slag, which is 1000 kg; 164 is the molar mass of sodium aluminate, g / mole; 40 is the molar mass of calcium ions, g / mole; 24.3 is the molar mass of magnesium ions, g / mole; X is the mass percentage of calcium ions in the molten salt chlorination waste slag, %; Y is the mass percentage of magnesium ions in the molten salt chlorination waste slag, %; A is the mass fraction of sodium aluminate, %; M is the mass of the molten salt chlorination waste slag, kg;

[0051]

[0052] In formula (3), W2 is the amount of sodium carbonate added, kg; 1.05 is the excess coefficient of sodium carbonate; 106 is the molar mass of sodium carbonate, g / mole; and B is the mass fraction of sodium carbonate, %.

[0053] Step 4: Return the filtrate C to the furnace for reuse, wash the filter residue B with water, let it stand and clarify it, and then separate the solid and liquid by a plate and frame filter press to obtain a solution D mainly composed of NaCl and a filter residue C (mainly calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and carbonate decomposition products calcium oxide and magnesium oxide) used as a roadbed paving material, refractory material, cement or steelmaking desulfurization agent.

[0054] The NaCl-based solution D is deeply purified and sent to the chlor-alkali process for use as brine.

[0055] In this embodiment, 80.2% of sodium chloride is recovered from the chlorinated waste residue.

[0056] Example 2

[0057] This embodiment provides a method for resource-processing molten salt chlorination waste residue using sodium aluminate and sodium carbonate, comprising the following steps:

[0058] Step 1, filtering the molten salt chlorination waste residue discharged from the chlorination furnace by vacuum filtration, the filter medium is alumina ceramic, and obtaining filter residue A and filtrate A, wherein the filter residue A is a mixture of TiO2, coke powder and SiO2, and the filter residue A is recycled and the filtrate A is to be treated;

[0059] Step 2, placing the filtrate A in a converter at a heating temperature of 690° C. for 50 minutes, and introducing compressed air at a pressure of 1.5 MPa into the converter to remove volatile components such as manganese chloride, ferrous chloride, aluminum chloride, silicon tetrachloride, titanium tetrachloride, etc. in the filtrate A to obtain filtrate B;

[0060] Step 3, adding a set amount of anhydrous sodium aluminate and sodium carbonate to the filtrate B to obtain a mixed solution, then heating and heat-insulating the mixed solution to generate a precipitate after the reaction, and then filtering the mixed solution with the precipitate by pressure filtration, the filter medium is a zirconium oxide filter plate with a pore size of 800ppi, to obtain a filter residue B and a filtrate C mainly composed of sodium chloride molten salt;

[0061] The heating and heat preservation process is as follows: firstly, the mixed solution is heated to 850° C., kept warm for 30 minutes, and then heated to 960° C., kept warm for 15 minutes, so that the sodium aluminate and sodium carbonate react fully with the calcium chloride and magnesium chloride to generate high melting point insoluble substances such as calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and their decomposition products such as calcium oxide and magnesium oxide;

[0062] It should be noted that this process requires continuous charging of compressed air.

[0063] Specifically, in this embodiment, the addition amount W of anhydrous sodium aluminate and sodium carbonate is based on the Ca content in the sampled sample of the chloride molten salt waste. 2+ Mg 2+ The mass percentage of ions X, Y (%) is calculated using the following formula:

[0064] W=W1+W2 (1)

[0065] in,

[0066] In formula (2), W1 is the amount of sodium aluminate added, kg; 1.05 is the excess coefficient of sodium aluminate; 1000 is the calculation base number of the mass of molten salt chlorination waste slag, which is 1000 kg; 164 is the molar mass of sodium aluminate, g / mole; 40 is the molar mass of calcium ions, g / mole; 24.3 is the molar mass of magnesium ions, g / mole; X is the mass percentage of calcium ions in the molten salt chlorination waste slag, %; Y is the mass percentage of magnesium ions in the molten salt chlorination waste slag, %; A is the mass fraction of sodium aluminate, %; M is the mass of molten salt chlorination waste slag, kg;

[0067]

[0068] In formula (3), W2 is the amount of sodium carbonate added, kg; 1.05 is the excess coefficient of sodium carbonate; 106 is the molar mass of sodium carbonate, g / mole; and B is the mass fraction of sodium carbonate, %.

[0069] Step 4: Return the filtrate C to the furnace for reuse, wash the filter residue B with water, let it stand and clarify it, and then separate the solid and liquid by a plate and frame filter press to obtain a solution D mainly composed of NaCl and a filter residue C (mainly calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and carbonate decomposition products calcium oxide and magnesium oxide) used as a roadbed paving material, refractory material, cement or steelmaking desulfurization agent.

[0070] The NaCl-based solution D is deeply purified and sent to the chlor-alkali process for use as brine.

[0071] In this embodiment, 85.2% of sodium chloride is recovered from the chlorinated waste residue.

[0072] Example 3

[0073] See also Figure 1 This embodiment provides a method for treating molten salt chlorination waste residue by using sodium aluminate and sodium carbonate as resources, comprising the following steps:

[0074] Step 1, filtering the molten salt chlorination waste residue discharged from the chlorination furnace by centrifugal separation, the filter medium is alumina ceramic, to obtain filter residue A and filtrate A, the filter residue A is a mixture of TiO2, coke powder and SiO2, the filter residue A is recycled, and the filtrate A is to be treated;

[0075] Step 2, placing the filtrate A in a converter at a heating temperature of 650° C. for 80 minutes, and introducing compressed air at a pressure of 1.0 MPa into the converter to remove volatile components such as manganese chloride, ferrous chloride, aluminum chloride, silicon tetrachloride, titanium tetrachloride, etc. in the filtrate A to obtain filtrate B;

[0076] Step 3, adding a set amount of anhydrous sodium aluminate and sodium carbonate to the filtrate B to obtain a mixed solution, then heating and heat-insulating the mixed solution to generate a precipitate after the reaction, and then filtering the mixed solution with the precipitate by pressure filtration, the filter medium is a zirconium oxide filter plate with a pore size of 50 ppi, to obtain a filter residue B and a filtrate C mainly composed of sodium chloride molten salt;

[0077] The heating and heat preservation process is as follows: firstly, the mixed solution is heated to 800° C., kept warm for 60 minutes, and then heated to 900° C., kept warm for 45 minutes, so that sodium aluminate and sodium carbonate react fully with calcium chloride and magnesium chloride to generate high melting point insoluble substances such as calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and their decomposition products calcium oxide and magnesium oxide;

[0078] It should be noted that this process requires continuous charging of compressed air.

[0079] Specifically, in this embodiment, the addition amount W of anhydrous sodium aluminate and sodium carbonate is based on the Ca content in the sampled sample of the chloride molten salt waste. 2+ Mg 2+ The mass percentage of ions X, Y (%) is calculated using the following formula:

[0080] W=W1+W2 (1)

[0081] in,

[0082] In formula (2), W1 is the amount of sodium aluminate added, kg; 1.05 is the excess coefficient of sodium aluminate; 1000 is the calculation base number of the mass of molten salt chlorination waste slag, which is 1000 kg; 164 is the molar mass of sodium aluminate, g / mole; 40 is the molar mass of calcium ions, g / mole; 24.3 is the molar mass of magnesium ions, g / mole; X is the mass percentage of calcium ions in the molten salt chlorination waste slag, %; Y is the mass percentage of magnesium ions in the molten salt chlorination waste slag, %; A is the mass fraction of sodium aluminate, %; M is the mass of molten salt chlorination waste slag, kg;

[0083]

[0084] In formula (3), W2 is the amount of sodium carbonate added, kg; 1.05 is the excess coefficient of sodium carbonate; 106 is the molar mass of sodium carbonate, g / mole; and B is the mass fraction of sodium carbonate, %.

[0085] Step 4: Return the filtrate C to the furnace for reuse, wash the filter residue B with water, let it stand and clarify it, and then separate the solid and liquid by a plate and frame filter press to obtain a solution D mainly composed of NaCl and a filter residue C (mainly calcium aluminate, magnesium aluminate, calcium carbonate, magnesium carbonate and carbonate decomposition products calcium oxide and magnesium oxide) used as a roadbed paving material, refractory material, cement or steelmaking desulfurization agent.

[0086] The NaCl-based solution D is deeply purified and sent to the chlor-alkali process for use as brine.

[0087] In this embodiment, 84.9% of sodium chloride is recovered from the chlorinated waste residue.

[0088] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0089] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for treating molten salt chlorination waste residue using sodium aluminate and sodium carbonate as resources, characterized in that: The following steps are involved: Step 1, performing solid-liquid separation on the molten salt chlorination waste residue after being discharged from the furnace to obtain filter residue A and filtrate A, and returning the filter residue A to the furnace for reuse; Step 2, placing the filtrate A in a converter at a heating temperature of 590°C to 690°C for 50min to 150min, and introducing compressed air into the converter at a set pressure to obtain filtrate B; Step 3, adding a set amount of sodium aluminate and sodium carbonate to the filtrate B to obtain a mixed solution, then heating and heat-insulating the mixed solution to generate a precipitate after reaction, and then performing solid-liquid separation on the mixed solution generating the precipitate to obtain a filter residue B and a filtrate C mainly composed of sodium chloride molten salt; Step 4: Return the filtrate C to the furnace for reuse, pretreat the filter residue B, and then perform solid-liquid separation to obtain a solution D mainly composed of NaCl and a filter residue C used as a roadbed paving material, refractory material, cement or steelmaking desulfurizer.

2. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 1, the filter residue A includes a mixture containing TiO2, coke powder and SiO2.

3. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 2, the set pressure is 0.01 MPa to 1.5 MPa.

4. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 3, the addition amount of sodium aluminate and sodium carbonate is calculated as follows: W=W1+W2 (1) in, In formula (2), W1 is the amount of sodium aluminate added, kg; 1.05 is the excess coefficient of sodium aluminate; 1000 is the calculation base number of the mass of molten salt chlorination waste slag, which is 1000 kg; 164 is the molar mass of sodium aluminate, g / mole; 40 is the molar mass of calcium ions, g / mole; 24.3 is the molar mass of magnesium ions, g / mole; X is the mass percentage of calcium ions in the molten salt chlorination waste slag, %; Y is the mass percentage of magnesium ions in the molten salt chlorination waste slag, %; A is the mass fraction of sodium aluminate, %; M is the mass of the molten salt chlorination waste slag, kg; In formula (3), W2 is the amount of sodium carbonate added, kg; 1.05 is the excess coefficient of sodium carbonate; 106 is the molar mass of sodium carbonate, g / mole; and B is the mass fraction of sodium carbonate, %.

5. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 3, the heating and heat preservation process includes: firstly heating the mixed solution to 720°C to 850°C, keeping it warm for 30min to 120min, and then heating it to 880°C to 960°C, keeping it warm for 15min to 120min.

6. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 4, the pretreatment process includes sequentially washing, standing and clarifying the filter residue B.

7. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 1, step 3 and step 4, the solid-liquid separation method adopts pressure filtration, vacuum filtration or centrifugal separation.

8. The method for recycling molten salt chlorination waste residue according to claim 1, characterized in that: In step 1, step 3 and step 4, the medium for solid-liquid separation is a steel mesh or a ceramic filter plate.

9. The method for recycling molten salt chlorination waste residue according to claim 8, characterized in that: The ceramic filter plate is an alumina ceramic filter plate or a zirconia ceramic filter plate with a pore size of 5ppi to 800ppi.

Images