Sarn-based acid bath efficient filtration and treatment system and method

Abstract

The invention belongs to the technical field of acid bath treatment, and particularly relates to an acid bath efficient filtering and treatment system and method based on skarn. The system comprises: an acid bath storage tank; the skarn adding device is communicated with the acid bath storage tank; the stirring and mixing device is arranged in the acid bath storage tank; the filtering device is communicated with the stirring and mixing device and is vertically arranged; according to the invention, skarn is adopted, so that the problems of low filtering efficiency, frequent blockage, tedious and complicated backwashing process, high acid sewage treatment difficulty, high cost and the like can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of acid bath treatment, and in particular relates to a skarn-based acid bath high-efficiency filtering and treatment system and method. Background Art

[0002] In the viscose chemical fiber, metallurgy, chemical industry and other industries, acid bath is an indispensable and important link in the production process. However, traditional acid bath filters are often clogged due to the accumulation of macromolecular pollutants such as suspended matter and colloidal particles, which affects the filtering effect and makes backwashing difficult, increasing the difficulty and cost of acid-base wastewater treatment. Simply trying to solve this problem from the filter aspect will encounter problems such as increased costs for filter disassembly and replacement of spare parts, and low filtering effect. Summary of the invention

[0003] To address the deficiencies of the prior art, the present invention provides a skarn-based acid bath high-efficiency filtration and treatment system and method.

[0004] The technical solution provided by the present invention is as follows:

[0005] A skarn-based acid bath high-efficiency filtration and treatment system, comprising:

[0006] Acid bath storage tank;

[0007] a skarn adding device connected to the acid bath storage tank;

[0008] A stirring and mixing device disposed in the acid bath storage tank;

[0009] A filtering device connected to the stirring and mixing device, wherein the filtering device is arranged vertically;

[0010] And a filtrate collecting tank and a waste residue discharging device connected to the filtering device.

[0011] Based on the above technology:

[0012] Use skarn to reduce the turbidity of the acid bath;

[0013] Skarn is used to form a porous membrane on the mesh or membrane of the filter device to intercept macromolecular pollutants such as suspended matter and colloidal particles in the acid bath to avoid filter clogging.

[0014] The skarn is obtained from the prior art, for example purchased.

[0015] The flow direction of the acid bath is horizontal, the filtering device is arranged vertically, and the filter screen of the filtering device is also arranged vertically.

[0016] Specifically, the particle size of the skarn is 180 mesh to 220 mesh.

[0017] Based on the above technical solution, if the particle size of skarn is too small, it will flow away and fail to form a porous membrane. If the particle size of skarn is too large, it will easily settle with gravity and fail to maintain the membrane structure on the filter screen or membrane of the vertically arranged filtering device.

[0018] The filtering device comprises at least one level of filtering units, and the filtering units at each level are sequentially arranged in series, and the filtering units at each level are vertically arranged.

[0019] Specifically: the filter unit is any one of a plate and frame filter, a bag filter or a filter element filter.

[0020] Specifically: the stirring and mixing device is a mechanical stirrer or a magnetic stirrer.

[0021] Specifically: the skarn adding device includes a skarn storage bin and a quantitative adding mechanism.

[0022] The present invention also provides a skarn-based acid bath high-efficiency filtration and treatment method, using the skarn-based acid bath high-efficiency filtration and treatment system, comprising the following steps:

[0023] 1) sending the acid bath to be treated into the acid bath storage tank;

[0024] 2) quantitatively adding skarn into the acid bath through the skarn adding device;

[0025] 3) starting the stirring and mixing device to stir and mix the acid bath and the skarn uniformly to obtain an acid bath suspension of the skarn;

[0026] 4) filtering the suspension by passing it through the filtering device in a horizontal flow direction;

[0027] 5) The filtrate after filtration is collected into the filtrate collecting tank, and the waste residue is discharged through the waste residue discharge device.

[0028] Specifically: in step 2), the amount of skarn added is 0.035%-0.045% of the mass of the acid bath.

[0029] Specifically: in step 3), the stirring and mixing time is 10 minutes to 30 minutes.

[0030] Specifically: in step 4), the filtering pressure of the filtering device is 0.5 MPa to 1 MPa.

[0031] Specifically: the applicable acid bath concentration is 30-150g / L, calculated based on H2SO4 content.

[0032] Beneficial effects of the present invention:

[0033] The present invention adds skarn to the acid bath, which can remove large molecular organic matter, suspended matter, sulfide and other solid impurities in the acid bath on the one hand, and can form a porous membrane on the net or membrane of the filtering device on the other hand, so as to intercept large molecular pollutants such as suspended matter and colloidal particles in the acid bath and avoid filter clogging, thereby solving problems such as low filtration efficiency, frequent clogging, cumbersome and complicated backwashing process, and difficulty and high cost in acid sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the skarn-based acid bath high-efficiency filtration and treatment system provided by the present invention.

[0035] Attached Figure 1 The structures represented by the labels are listed below:

[0036] 1. Acid bath storage tank; 2. Skarn adding device; 3. Stirring and mixing device; 4. Filtration device; 5. Filtrate collecting tank; 6. Waste residue discharge device; 7. Porous membrane. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] Unless otherwise specified, the test methods used in the examples are conventional methods; the materials and reagents used are commercially available reagents and materials unless otherwise specified.

[0039] The main components of the treated acid bath are: 118 g / l sulfuric acid, 12.5 g / l zinc sulfate, 350 g / l sodium sulfate, and the bath temperature is 48°C.

[0040] Example 1

[0041] like Figure 1 As shown, the acid bath high-efficiency filtration and treatment system based on skarn includes: an acid bath storage tank 1; a skarn adding device 2 connected to the acid bath storage tank 1; a stirring and mixing device 3 arranged in the acid bath storage tank 1; a filtering device 4 connected to the stirring and mixing device 3, the filtering device 4 being arranged vertically; and a filtrate collecting tank 5 and a waste residue discharging device 6 connected to the filtering device 4. The skarn adding device 2 includes a skarn storage bin and a quantitative adding mechanism.

[0042] The filter device 4 includes a primary filter unit, which is a plate-frame filter. In other embodiments, multi-stage filtration can be provided, and the filter units at each stage are sequentially arranged in series, and the filter units at each stage are arranged vertically. In other embodiments, it can be a bag filter or a filter cartridge filter.

[0043] The stirring and mixing device 3 is a mechanical stirrer, and in other embodiments it may be a magnetic stirrer.

[0044] The system is equipped with a pump to provide power for water flow.

[0045] After adding skarn to the acid bath, skarn begins to remove fiber pieces, unreacted fiber fragments, organic resins, gel particles, semi-fiber and inorganic chelates, organic particles, metal crystals, inorganic particles, and solid impurities such as ash and rust in the acid bath.

[0046] After the system is running, a layer of skarn porous membrane 7 will accumulate on the filter membrane or mesh structure of the filter, intercepting macromolecular pollutants such as suspended matter and colloidal particles.

[0047] Effect Example 1

[0048] Using the system of Example 1, the acid bath high-efficiency filtration and treatment method based on skarn includes the following steps:

[0049] 1) sending the acid bath to be treated into the acid bath storage tank 1;

[0050] 2) quantitatively adding skarn into the acid bath through the skarn adding device 2;

[0051] 3) starting the stirring and mixing device 3 to stir and mix the acid bath and the skarn uniformly to obtain an acid bath suspension of the skarn;

[0052] 4) filtering the suspension through the filter device 4 in a horizontal flow direction;

[0053] 5) The filtered filtrate is collected in the filtrate collecting tank 5, and the waste residue is discharged through the waste residue discharge device 6.

[0054] The filter unit is a plate and frame filter with two stages.

[0055] In step 2), the average particle size of the skarn is about 200 mesh.

[0056] In step 2), the amount of skarn added is 0.04% of the mass of the acid bath.

[0057] In step 3), the stirring and mixing time is 25 minutes.

[0058] In step 4), the filtering pressure of the filtering device 4 is 0.6Mpa.

[0059] After treatment, the collected filtrate is tested, and the indicators are:

[0060] The acid bath turbidity is about 14 NTU;

[0061] The hemicellulose content is about 14 mg / l;

[0062] The sulfide content is about 11 mg / l;

[0063] The COD value is about 4400;

[0064] The sludge discharged from the waste discharge device is about 0.015% of the weight of the acid bath;

[0065] The operating pressure of the tow filter filtration system is about 0.24Mpa.

[0066] Effect Example 2

[0067] Refer to effect example 1, the difference is: the acid bath temperature is about 35°C.

[0068] After treatment, the collected filtrate is tested, and the indicators are:

[0069] The acid bath turbidity is about 15 NTU;

[0070] The hemicellulose content is about 15 mg / l;

[0071] The sulfide content is about 11 mg / l;

[0072] The COD value is about 4750;

[0073] The sludge discharged from the waste discharge device is about 0.012% of the weight of the acid bath;

[0074] The operating pressure of the tow filter filtration system is about 0.30Mpa.

[0075] Effect Example 3

[0076] Refer to effect example 1, the difference is: the acid bath concentration is about 85g / l.

[0077] After treatment, the collected filtrate is tested, and the indicators are:

[0078] The acid bath turbidity is about 16NTU;

[0079] The hemicellulose content is about 15 mg / l;

[0080] The sulfide content is about 13 mg / l;

[0081] The COD value is about 4950;

[0082] The sludge discharged from the waste discharge device is about 0.013% of the weight of the acid bath;

[0083] The operating pressure of the tow filter filtration system is about 0.24Mpa.

[0085] Comparative Example 1

[0086] Refer to effect example 1, except that skarn is not added.

[0087] After treatment, the collected filtrate is tested, and the indicators are:

[0088] The acid bath turbidity is about 52 NTU;

[0089] The hemicellulose content is about 44 mg / l;

[0090] The sulfide content is about 22 mg / l;

[0091] The COD value is about 7700;

[0092] The sludge discharged from the waste slag discharge device is about 0.009% of the weight of the acid bath.

[0093] The operating pressure of the tow filter filtration system is about 0.41Mpa. The tow filter is seriously clogged and filtering is difficult.

[0094] Comparative Example 2

[0095] Refer to Effect Example 1, except that skarn is replaced with diatomaceous earth.

[0096] After treatment, the collected filtrate is tested, and the indicators are:

[0097] The acid bath turbidity is about 30NTU;

[0098] The hemicellulose content is about 32 mg / l;

[0099] The sulfide content is about 16 mg / l;

[0100] COD value 4400;

[0101] The sludge discharged from the waste slag discharge device is about 0.012% of the weight of the acid bath.

[0102] After operation, the operating pressure of the tow filter filtration system was about 0.29Mpa, and the blockage of the filtration system was slightly alleviated, but filtration still had difficulties.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A skarn-based acid bath high-efficiency filtration and treatment system, characterized in that: include: Acid bath storage tank (1); A skarn adding device (2) connected to the acid bath storage tank (1); A stirring and mixing device (3) disposed in the acid bath storage tank (1); A filtering device (4) connected to the stirring and mixing device (3), wherein the filtering device (4) is arranged vertically; And a filtrate collection tank (5) and a waste residue discharge device (6) connected to the filtering device (4).

2. The skarn-based acid bath high-efficiency filtration and treatment system according to claim 1, characterized in that: The particle size of skarn is 180 mesh to 220 mesh.

3. The skarn-based acid bath high-efficiency filtration and treatment system according to claim 2, characterized in that: The filtering device (4) comprises at least one level of filtering units, and the filtering units at each level are sequentially arranged in series, and the filtering units at each level are arranged vertically.

4. The skarn-based acid bath high-efficiency filtration and treatment system according to claim 3, characterized in that: The filter unit is any one of a plate-and-frame filter, a bag filter or a cartridge filter.

5. The skarn-based acid bath high-efficiency filtration and treatment system according to claim 1, characterized in that: The stirring and mixing device (3) is a mechanical stirrer or a magnetic stirrer.

6. The skarn-based acid bath high-efficiency filtration and treatment system according to claim 1, characterized in that: The skarn adding device (2) comprises a skarn storage bin and a quantitative adding mechanism.

7. A method for efficient acid bath filtration and treatment based on skarn, characterized in that: The skarn-based acid bath high-efficiency filtration and treatment system according to any one of claims 1 to 6 comprises the following steps: 1) sending the acid bath to be treated into the acid bath storage tank (1); 2) quantitatively adding skarn into the acid bath through the skarn adding device (2); 3) starting the stirring and mixing device (3) to stir and mix the acid bath and the skarn uniformly to obtain an acid bath suspension of the skarn; 4) passing the suspension through the filtering device (4) in a horizontal flow direction for filtering; 5) The filtrate after filtration is collected into the filtrate collecting tank (5), and the waste residue is discharged through the waste residue discharge device (6).

8. The acid bath high-efficiency filtration and treatment method based on skarn according to claim 7, characterized in that: In step 2), the amount of skarn added is 0.035%-0.045% of the mass of the acid bath.

9. The acid bath high-efficiency filtration and treatment method based on skarn according to claim 7, characterized in that: In step 3), the stirring and mixing time is 10 minutes to 30 minutes.

10. The acid bath high-efficiency filtration and treatment method based on skarn according to claim 7, characterized in that: In step 4), the filtering pressure of the filtering device (4) is 0.5 MPa to 1 MPa.

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