Impurity treatment process and device for waste acid purification

Abstract

The invention discloses an impurity treatment process and device for waste acid purification, and particularly relates to the technical field of waste acid purification, and the impurity treatment process comprises the following steps: step 1, waste acid is subjected to weight removal through an AUM unit, is subjected to pretreatment fluorine removal and then is introduced into a neutralizing tank, and roasted sand is introduced into the neutralizing tank through a screw conveyor to neutralize the waste acid subjected to weight removal and fluorine removal; 2, the neutralized waste acid is subjected to filter pressing treatment through a filter press and guided into a buffer tank; step 3, filtering the materials in the buffer tank through a UF technology, and guiding liquid generated by filtering into an intermediate tank; according to the method, sulfate and other chemical fertilizer products are produced by using the sulfuric acid component in the waste acid, compared with the traditional sulfate chemical fertilizer production, although the cost of sulfate radicals is low, the purification cost of the waste acid is high due to the existence of various heavy metals and other impurities in the waste acid, and the economic benefit is not ideal due to the dual influence of the chemical fertilizer market and the purification cost; and compared with a traditional lime precipitation method of waste acid treatment, the method still has great advantages.

Description

Technical Field

[0001] The invention relates to the technical field of waste acid purification, and in particular to an impurity treatment process and device for waste acid purification. Background Art

[0002] Dirty acid is formed during the flue gas purification process of the flue gas acid production process. The main component of the dirty acid is sulfuric acid, which accounts for about 3-10%. It contains a variety of heavy metals and impurity ions such as fluorine and chlorine washed from the flue gas. The traditional way to treat dirty acid is mainly to use lime precipitation on the discharged dirty acid. This method can effectively remove heavy metals and fluorine, but is basically ineffective for chlorine, produces a large amount of solid precipitate residue, and the sulfuric acid component in the dirty acid cannot be retained. For this reason, we propose an impurity treatment process and device for dirty acid purification to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide an impurity treatment process and device for purifying contaminated acid to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an impurity treatment process for purifying contaminated acid, comprising the following steps:

[0005] Step 1: The waste acid is deweighted by the AUM unit and pre-treated for defluorination, and then introduced into the neutralization tank. The roasted sand is introduced into the neutralization tank through a screw conveyor to neutralize the waste acid after deweighting and defluorination.

[0006] Step 2: The neutralized waste acid is filtered through a filter press and introduced into a buffer tank;

[0007] Step 3: The material in the buffer tank is filtered by UF technology, and the liquid produced by filtration is introduced into the intermediate tank;

[0008] Step 4: The material in the intermediate pool is introduced into the CUM1 unit for purification, and the purified liquid is introduced into the purified liquid tank. Among them, the high-chlorine wastewater generated in the CUM1 unit is introduced into the high-chlorine wastewater tank and then introduced into the CUM2 unit for further purification, and the purified liquid is introduced into the purified liquid tank. The high-chlorine wastewater generated in CUM2 is introduced into the sewage treatment plant, and the purified liquid is directly introduced into the wet process workshop for subsequent treatment.

[0009] An impurity treatment process for purifying contaminated acid comprises the following steps:

[0010] Step 1: The dirty acid is deweighted by passing through the AUM unit;

[0011] Step 2: The waste acid after de-weighting is introduced into the mixing tank 1 unit, and the pretreatment agent A is added into the mixing tank 1 unit and mixed with the waste acid after de-weighting for pre-treatment;

[0012] Step 3: The mixed pretreated waste acid is introduced into the clarification tank unit 1 for clarification, and the slag produced by clarification is returned to the mixing tank unit 1;

[0013] Step 4: The clarified dirty acid is introduced into the mixing tank 2 unit, and at the same time, the pretreatment agent B or the pretreatment agent C is added into the mixing tank 2 unit and mixed with the deweighted dirty acid for another pretreatment;

[0014] Step 5: Mix the pretreated waste acid again and introduce it into the clarification tank 2 unit for clarification treatment. The clarified waste acid is introduced into the mixing tank 3 unit. The material produced by clarification enters the filter press 1 for filtration to produce product 1. The filtrate can be introduced into the mixing tank 2 unit again.

[0015] Step 6: Add a neutralizing agent to the mixing tank 3 unit to neutralize the clarified dirty acid;

[0016] Step 7: The waste acid after neutralization treatment is introduced into the clarification tank 3 unit for clarification treatment, and the waste acid after clarification treatment is introduced into the intermediate tank unit, and then introduced into the CUM1 unit for purification treatment, wherein the material produced by the clarification treatment and the material produced by the purification treatment are introduced into the filter press 2 for filtration to produce product 2, and the filtrate can be introduced into the mixing tank 3 unit;

[0017] Step 8: The waste acid purified in the CUM1 unit is introduced into the CUM2 unit for further purification to generate product 3 and produce water.

[0018] As a preferred technical solution of the present invention, the pretreatment agent A comprises zinc carbonate, calcium carbonate, calcium oxide, silicon dioxide and hydroxide;

[0019] As a preferred technical solution of the present invention, the pretreatment agent B comprises aluminum sulfate, ammonium aluminum sulfate, potassium aluminum sulfate, anhydrous potassium aluminum sulfate, potassium sulfate, aluminum hydroxide and hydroxide;

[0020] As a preferred technical solution of the present invention, the pretreatment C reagent composition includes aluminum hydroxide, hydroxide, sodium aluminate, potassium aluminate and potassium hydroxide;

[0021] As a preferred technical solution of the present invention, the neutralizer composition includes aluminum hydroxide, potassium hydroxide and hydroxide.

[0022] A device for impurity treatment process for purifying waste acid, comprising a mixing device for mixing waste acid and pretreatment agent, the mixing device comprising a support frame, a mixing cylinder fixedly mounted in the middle of the support frame, a liquid inlet pipe fixedly mounted on one side of the bottom of the mixing cylinder, a liquid outlet pipe fixedly mounted on the side of the bottom of the mixing cylinder away from the liquid inlet pipe, a waste discharge pipe fixedly mounted on one side of the bottom end of the mixing cylinder, a reflux pipe fixedly mounted on the side of the bottom end of the mixing cylinder away from the waste discharge pipe, a bearing fixedly mounted in the middle of the top end of the mixing cylinder, a mixing middle cylinder fixedly mounted in the middle of the bearing, a plurality of evenly distributed mixing side cylinders fixedly mounted on the outer side of the mixing middle cylinder, and a plurality of mixing side cylinders evenly distributed on the outer side of the mixing side cylinder A plurality of evenly distributed rows of holes are provided, a sealing rotating part is fixedly provided at the top of the mixing cylinder, a first tube is fixedly installed in the middle of the sealing rotating part, the first tube is fixedly installed at the top of the mixing cylinder, a concave platform is fixedly installed on the lower surface of the inner wall of the mixing cylinder, a convex platform is fixedly installed in the middle of the lower surface of the inner wall of the mixing cylinder, a waste discharge groove is formed between the concave platform and the convex platform, an auxiliary frame is fixedly installed on the top and bottom of the outer side of the mixing cylinder, a longitudinal scraping strip is fixedly installed at one end of the auxiliary frame away from the mixing cylinder, the longitudinal scraping strip is in contact with the inner wall of the mixing cylinder, a transverse scraping strip is fixedly installed on the bottom end of the longitudinal scraping strip, the transverse scraping strip is in contact with the inner wall of the waste discharge groove.

[0023] As a preferred technical solution of the present invention, the top of the mixing middle cylinder extends out of the top of the mixing cylinder and is fixedly installed with a crown gear, a driving motor is fixedly installed on the side of the top of the mixing cylinder close to the crown gear, a driving end of the driving motor is fixedly installed with a driving gear, and the driving gear and the crown gear are meshingly connected.

[0024] As a preferred technical solution of the present invention, a tee is fixedly installed at the end of the first tube, a first pump and a second pump are fixedly installed at one end of the tee away from the first tube, the second tube is fixedly installed at one end of the first pump away from the first tube, and a third tube is fixedly installed at one end of the second pump away from the first tube.

[0025] As a preferred technical solution of the present invention, a first valve is fixedly installed on the liquid inlet pipe, a second valve is fixedly installed on the liquid outlet pipe, a third valve is fixedly installed on the waste pipe, and a fourth valve is fixedly installed on the reflux pipe.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Figure 1In the impurity treatment process for the purification of waste acid shown in the figure, the AUM unit plays the role of removing the weight of the waste acid, controlling various heavy metals so that their contents meet the leaching requirements of the leaching process; then fluorine is removed through pretreatment, and chlorine is removed by the CUM unit. The fluorine and chlorine in the purified liquid basically meet the requirements for direct use in the leaching process. The purified liquid can be directly sent to the wet process workshop for subsequent treatment or used as a fertilizer raw material.

[0028] 2. By utilizing the sulfuric acid component in the waste acid to produce sulfate and other fertilizer products, compared with the traditional sulfate fertilizer production, although the sulfate cost is low, the presence of various heavy metals and other impurities in the waste acid makes the purification cost of the waste acid high. The economic benefits are not ideal due to the dual influence of the fertilizer market and the purification cost. However, compared with the traditional method of waste acid treatment, lime precipitation, it still has great advantages.

[0029] 3. Figure 2 In the impurity treatment process for waste acid purification shown in the figure, since sulfate is produced from waste acid, the weight removal of the AUM unit is mainly controlled according to the regulations on toxic and harmful impurities in fertilizer products, and pre-treatment is performed to remove fluorine. Since the content of chloride salts in fertilizer products is not specifically stipulated, the removal of chlorine is not the focus of this process. Figure 2 In the impurity treatment process for waste acid purification shown, since the waste acid components vary greatly, whether precipitation is produced after neutralization determines whether to use the CUM unit for chlorine removal.

[0030] 4. By setting up a mixing device, during pretreatment mixing, the pretreatment agent is evenly discharged into the mixing barrel through multiple row holes, firstly reacts with the dirty acid in a large area, reducing the subsequent mixing time, and coordinating with the rotation of the subsequent multiple mixing side barrels, the dirty acid and the pretreatment agent in the mixing barrel are stirred and mixed, thereby improving the reaction efficiency of the dirty acid and the pretreatment agent.

[0031] 5. By setting up longitudinal scraping bars and transverse scraping bars, after the treated dirty acid is discharged, the auxiliary frame, longitudinal scraping bars and transverse scraping bars are driven to rotate while cooperating with the rotation of the mixing drum. The longitudinal scraping bars clean the inner wall of the mixing drum, and the transverse scraping bars clean the waste discharge groove. At the same time, the third valve is opened, and the cleaned waste liquid is effectively discharged through the waste discharge groove and the waste discharge pipe to clean the inner wall of the mixing drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1This is a process flow chart for removing F and CI from polluted acid water in Example 1 of the present invention.

[0034] Figure 2 This is a process flow chart for removing F and CI from contaminated acid water in Example 2 of the present invention.

[0035] Figure 3 Schematic diagram of the structure of the mixing device in Example 2 of the present invention.

[0036] Figure 4 It is a schematic diagram of the structure of the mixing device after being disassembled in the present invention.

[0037] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle.

[0038] Figure 6 It is a schematic structural diagram of the mixing middle cylinder and the mixing side cylinder in the present invention.

[0039] Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle.

[0040] Figure 8 It is a schematic diagram of the structural connection of the longitudinal scraper strips and the transverse scraper strips in the present invention.

[0041] In the figure: 1. support frame; 2. mixing cylinder; 21. liquid inlet pipe; 211. first valve; 22. liquid outlet pipe; 221. second valve; 23. waste pipe; 231. third valve; 24. reflux pipe; 241. fourth valve; 3. mixing middle cylinder; 31. mixing side cylinder; 301. row hole; 32. bearing; 33. sealing rotating part; 34. first pipe; 35. three-way pipe; 351. first pump; 352. second pump; 353. second pipe; 354. third pipe; 4. auxiliary frame; 41. longitudinal scraper; 42. transverse scraper; 5. crown gear; 51. drive motor; 52. drive gear; 6. concave platform; 61. boss; 601. waste groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Example 1: Figure 1 As shown, the present invention provides an impurity treatment process for purifying contaminated acid, comprising the following steps:

[0044] Step 1: The waste acid is deweighted by the AUM unit and pre-treated for defluorination, and then introduced into the neutralization tank. The roasted sand is introduced into the neutralization tank through a screw conveyor to neutralize the waste acid after deweighting and defluorination.

[0045] Step 2: The neutralized waste acid is filtered through a filter press and introduced into a buffer tank;

[0046] Step 3: The material in the buffer tank is filtered by UF technology, and the liquid produced by filtration is introduced into the intermediate tank;

[0047] Step 4: The materials in the intermediate pool are introduced into the CUM1 unit for purification, and the purified liquid is introduced into the purified liquid tank. The high-chlorine wastewater produced in the CUM1 unit is introduced into the high-chlorine wastewater tank and then introduced into the CUM2 unit for further purification, and the purified liquid is introduced into the purified liquid tank. The high-chlorine wastewater produced in CUM2 is introduced into the sewage treatment plant, and the purified liquid is directly introduced into the wet process workshop for subsequent treatment;

[0048] If the purified liquid is not returned to the leaching system, it can also be considered for sale as fertilizer.

[0049] Zinc smelting and leaching requires sulfuric acid and water dilution, so the waste acid returns to this process after purification.

[0050] Figure 1 In the impurity treatment process for the purification of waste acid shown in the figure, the AUM unit plays the role of removing the weight of the waste acid, controlling various heavy metals so that their contents meet the leaching requirements of the leaching process; then fluorine is removed through pretreatment, and chlorine is removed by the CUM unit. The fluorine and chlorine in the purified liquid basically meet the requirements for direct use in the leaching process. The purified liquid can be directly sent to the wet process workshop for subsequent treatment or used as a fertilizer raw material.

[0051] Example 2: Figure 2-8 As shown, the present invention provides an impurity treatment process for purifying contaminated acid, comprising the following steps:

[0052] Step 1: The dirty acid is deweighted by passing through the AUM unit;

[0053] Step 2: The waste acid after de-weighting is introduced into the mixing tank 1 unit, and the pretreatment agent A is added into the mixing tank 1 unit and mixed with the waste acid after de-weighting for pre-treatment;

[0054] Step 3: The mixed pretreated waste acid is introduced into the clarification tank unit 1 for clarification, and the slag produced by clarification is returned to the mixing tank unit 1;

[0055] Step 4: The clarified dirty acid is introduced into the mixing tank 2 unit, and at the same time, the pretreatment agent B or the pretreatment agent C is added into the mixing tank 2 unit and mixed with the deweighted dirty acid for another pretreatment;

[0056] Step 5: Mix the pretreated waste acid again and introduce it into the clarification tank 2 unit for clarification treatment. The clarified waste acid is introduced into the mixing tank 3 unit. The material produced by clarification enters the filter press 1 for filtration to produce product 1. The filtrate can be introduced into the mixing tank 2 unit again.

[0057] Step 6: Add a neutralizing agent to the mixing tank 3 unit to neutralize the clarified dirty acid;

[0058] Step 7: The waste acid after neutralization treatment is introduced into the clarification tank 3 unit for clarification treatment, and the waste acid after clarification treatment is introduced into the intermediate tank unit, and then introduced into the CUM1 unit for purification treatment, wherein the material produced by the clarification treatment and the material produced by the purification treatment are introduced into the filter press 2 for filtration to produce product 2, and the filtrate can be introduced into the mixing tank 3 unit;

[0059] Among them, due to the great difference in the composition of the waste acid, if product 2 cannot form a precipitate, the filtration treatment of filter press 2 can be considered to be cancelled; if the amount of precipitation of product 2 is large, the purification step of the CUM unit can be considered to be cancelled;

[0060] Step 8: The waste acid purified in the CUM1 unit is introduced into the CUM2 unit for further purification to generate product 3 and produce water.

[0061] By using the sulfuric acid component in the waste acid to produce sulfate and other fertilizer products, compared with the traditional sulfate fertilizer production, although the sulfate ion cost is low, the presence of various heavy metals and other impurities in the waste acid makes the waste acid purification cost high. The economic benefits are affected by the fertilizer market and the purification cost and are not ideal. However, compared with the traditional method of waste acid treatment, lime precipitation, it still has great advantages.

[0062] Figure 2 In the impurity treatment process for waste acid purification shown in the figure, since sulfate is produced from waste acid, the weight removal of the AUM unit is mainly controlled according to the regulations on toxic and harmful impurities in fertilizer products, and pre-treatment is performed to remove fluorine. Since the content of chloride salts in fertilizer products is not specifically stipulated, the removal of chlorine is not the focus of this process. Figure 2 In the impurity treatment process for waste acid purification shown, since the waste acid components vary greatly, whether precipitation is produced after neutralization determines whether to use the CUM unit for chlorine removal.

[0063] Figure 2 In the impurity treatment process for the purification of waste acid shown in the figure, the pretreatment mainly plays the role of removing fluorine. Figure 1 The impurity treatment process for the purification of dirty acid shown in the figure has the same pretreatment effect, but the treatment process and the reagents used are different;

[0064] The components of the pretreatment A reagent include zinc carbonate, calcium carbonate, calcium oxide, silicon dioxide and hydroxide; the components of the pretreatment B reagent include aluminum sulfate, ammonium aluminum sulfate, potassium aluminum sulfate, anhydrous potassium aluminum sulfate, potassium sulfate, aluminum hydroxide and hydroxide; the components of the pretreatment C reagent include aluminum hydroxide, hydroxide, sodium aluminate, potassium aluminate and potassium hydroxide; the components of the neutralizer include aluminum hydroxide, potassium hydroxide and hydroxide.

[0065] A device for impurity treatment process for purifying waste acid, comprising a mixing device for mixing waste acid and a pretreatment agent, the mixing device comprising a support frame 1, a mixing drum 2 is fixedly installed in the middle of the support frame 1, a liquid inlet pipe 21 is fixedly installed on one side of the bottom of the mixing drum 2, a first valve 211 is fixedly installed on the liquid inlet pipe 21, a liquid outlet pipe 22 is fixedly installed on the side of the bottom of the mixing drum 2 away from the liquid inlet pipe 21, a second valve 221 is fixedly installed on the liquid outlet pipe 22, a waste pipe 23 is fixedly installed on one side of the bottom end of the mixing drum 2, a third valve 231 is fixedly installed on the waste pipe 23, a reflux pipe 24 is fixedly installed on the side of the bottom end of the mixing drum 2 away from the waste pipe 23, a fourth valve 241 is fixedly installed on the reflux pipe 24, when in use, the first valve 211 is controlled to be opened, the waste acid is introduced into the mixing drum 2 through the liquid inlet pipe 21, the fourth valve 241 is controlled to be opened, and the refluxed filtrate can be introduced into the mixing drum 2 again through the reflux pipe 24;

[0066] A bearing 32 is fixedly clamped at the middle part of the top of the mixing cylinder 2, and a mixing middle cylinder 3 is fixedly clamped at the middle part of the bearing 32. A plurality of evenly distributed mixing side cylinders 31 are fixedly installed on the outer side of the mixing middle cylinder 3; the top of the mixing middle cylinder 3 extends out of the top of the mixing cylinder 2 and is fixedly installed with a crown gear 5, and a driving motor 51 is fixedly installed on the side of the top of the mixing cylinder 2 close to the crown gear 5, and a driving end of the driving motor 51 is fixedly installed with a driving gear 52, and the driving gear 52 and the crown gear 5 are meshingly connected. When in use, the driving motor 51 is controlled to start and drive the driving gear 52 to drive the crown gear 5 to rotate, thereby driving the mixing middle cylinder 3 and the plurality of mixing side cylinders 31 to rotate, and then the dirty acid and the pretreatment agent in the mixing cylinder 2 are stirred and mixed, thereby improving the reaction efficiency of the dirty acid and the pretreatment agent;

[0067] The mixing side cylinder 31 is provided with a plurality of rows of holes 301 evenly distributed, the top of the mixing middle cylinder 3 is fixedly provided with a sealing rotating member 33, the middle of the sealing rotating member 33 is fixedly provided with a first tube 34, and the first tube 34 is fixedly provided at the top of the mixing cylinder 2; a three-way tube 35 is fixedly provided at the end of the first tube 34, and a first pump 351 and a second pump 352 are fixedly provided at one end of the three-way tube 35 away from the first tube 34, respectively; a second tube 353 is fixedly provided at one end of the first pump 351 away from the first tube 34, and a third tube 354 is fixedly provided at one end of the second pump 352 away from the first tube 34; when in use, the second tube 353 is connected to the output end of the pretreatment agent output system, The third tube 354 is connected to the output end of the cleaning agent output system. During pretreatment mixing, the pretreatment agent output system and the first pump 351 are controlled to be opened. The pretreatment agent is introduced into the mixing middle cylinder 3 through the second tube 353, the three-way tube 35 and the first tube 34, and then introduced into multiple mixing side cylinders 31. Then, it is evenly discharged into the mixing cylinder 2 through multiple row holes 301. First, it reacts with the dirty acid in a large area to reduce the subsequent mixing time. In conjunction with the rotation of the subsequent multiple mixing side cylinders 31, the dirty acid and the pretreatment agent in the mixing cylinder 2 are stirred and mixed to improve the reaction efficiency of the dirty acid and the pretreatment agent. After the reaction is completed, the second valve 221 is controlled to be opened, and the treated dirty acid is discharged through the liquid outlet pipe 22 for subsequent treatment.

[0068] A concave platform 6 is fixedly installed on the lower surface of the inner wall of the mixing cylinder 2, a convex platform 61 is fixedly installed in the middle of the lower surface of the inner wall of the mixing cylinder 2, and a waste discharge groove 601 is formed between the concave platform 6 and the convex platform 61. Auxiliary frames 4 are fixedly installed on the top and bottom of the outer side of the mixing middle cylinder 3, and a longitudinal scraper 41 is fixedly installed at one end of the auxiliary frame 4 away from the mixing middle cylinder 3. The longitudinal scraper 41 contacts the inner wall of the mixing cylinder 2, and a transverse scraper 42 is fixedly installed at the bottom end of the longitudinal scraper 41. The transverse scraper 42 contacts the inner wall of the waste discharge groove 601. After the treated waste acid is discharged, it can be opened for cleaning. The cleaning agent output system and the second pump 352 are used. The cleaning agent is introduced into the mixing middle cylinder 3 through the third tube 354, the three-way tube 35 and the first tube 34, and then introduced into multiple mixing side cylinders 31, and then evenly discharged into the mixing cylinder 2 through multiple discharge holes 301. While cooperating with the rotation of the mixing middle cylinder 3, the auxiliary frame 4, the longitudinal scraping bar 41 and the transverse scraping bar 42 are driven to rotate. The longitudinal scraping bar 41 cleans the inner wall of the mixing cylinder 2, and the transverse scraping bar 42 cleans the waste discharge groove 601. At the same time, the third valve 231 is opened, and the cleaned waste liquid is effectively discharged through the waste discharge groove 601 and the waste discharge pipe 23 to clean the inner wall of the mixing cylinder 2.

[0069] Working principle: When in use, the second tube 353 is connected to the output end of the pretreatment agent output system, and the third tube 354 is connected to the output end of the cleaning agent output system;

[0070] The first valve 211 is controlled to be opened, and the waste acid is introduced into the mixing drum 2 through the liquid inlet pipe 21, and the fourth valve 241 is controlled to be opened, and the refluxed filtrate can be introduced into the mixing drum 2 again through the reflux pipe 24;

[0071] During pretreatment mixing, the driving motor 51 is controlled to start and drive the driving gear 52 to drive the crown gear 5 to rotate, thereby driving the mixing middle cylinder 3 and the plurality of mixing side cylinders 31 to rotate;

[0072] The pretreatment agent output system and the first pump 351 are controlled to be turned on. The pretreatment agent is introduced into the mixing middle cylinder 3 through the second tube 353, the three-way tube 35 and the first tube 34, and then introduced into the multiple mixing side cylinders 31. Then, it is evenly discharged into the mixing cylinder 2 through the multiple row holes 301. First, it reacts with the waste acid in a large area to reduce the subsequent mixing time. In conjunction with the rotation of the subsequent multiple mixing side cylinders 31, the waste acid and the pretreatment agent in the mixing cylinder 2 are stirred and mixed to improve the reaction efficiency of the waste acid and the pretreatment agent. After the reaction is completed, the second valve 221 is controlled to be opened, and the treated waste acid is discharged through the liquid outlet pipe 22 for subsequent treatment.

[0073] After the treated waste acid is discharged, the cleaning agent output system and the second pump 352 can be opened, and the cleaning agent is introduced into the mixing middle cylinder 3 through the third tube 354, the three-way tube 35 and the first tube 34, and then introduced into multiple mixing side cylinders 31, and then evenly discharged into the mixing cylinder 2 through multiple row holes 301. While cooperating with the rotation of the mixing middle cylinder 3, the auxiliary frame 4, the longitudinal scraper bar 41 and the transverse scraper bar 42 are driven to rotate, the longitudinal scraper bar 41 cleans the inner wall of the mixing cylinder 2, and the transverse scraper bar 42 cleans the waste discharge groove 601. At the same time, the third valve 231 is opened, and the cleaned waste liquid is effectively discharged through the waste discharge groove 601 and the waste discharge pipe 23 to clean the inner wall of the mixing cylinder 2.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An impurity treatment process for purifying dirty acid, characterized in that: The steps include: Step 1: The waste acid is deweighted by the AUM unit and pre-treated for defluorination, and then introduced into the neutralization tank. The roasted sand is introduced into the neutralization tank through a screw conveyor to neutralize the waste acid after deweighting and defluorination. Step 2: The neutralized waste acid is filtered through a filter press and introduced into a buffer tank; Step 3: The material in the buffer tank is filtered by UF technology, and the liquid produced by filtration is introduced into the intermediate tank; Step 4: The material in the intermediate pool is introduced into the CUM1 unit for purification, and the purified liquid is introduced into the purified liquid tank. Among them, the high-chlorine wastewater generated in the CUM1 unit is introduced into the high-chlorine wastewater tank and then introduced into the CUM2 unit for further purification, and the purified liquid is introduced into the purified liquid tank. The high-chlorine wastewater generated in CUM2 is introduced into the sewage treatment plant, and the purified liquid is directly introduced into the wet process workshop for subsequent treatment.

2. An impurity treatment process for purifying dirty acid, characterized in that: The steps include: Step 1: The dirty acid is deweighted by passing through the AUM unit; Step 2: The waste acid after de-weighting is introduced into the mixing tank 1 unit, and the pretreatment agent A is added into the mixing tank 1 unit and mixed with the waste acid after de-weighting for pre-treatment; Step 3: The mixed pretreated waste acid is introduced into the clarification tank unit 1 for clarification, and the slag produced by clarification is returned to the mixing tank unit 1; Step 4: The clarified dirty acid is introduced into the mixing tank 2 unit, and at the same time, the pretreatment agent B or the pretreatment agent C is added into the mixing tank 2 unit and mixed with the deweighted dirty acid for another pretreatment; Step 5: Mix the pretreated waste acid again and introduce it into the clarification tank 2 unit for clarification treatment. The clarified waste acid is introduced into the mixing tank 3 unit. The material produced by clarification enters the filter press 1 for filtration to produce product 1. The filtrate can be introduced into the mixing tank 2 unit again. Step 6: Add a neutralizing agent to the mixing tank 3 unit to neutralize the clarified dirty acid; Step 7: The waste acid after neutralization treatment is introduced into the clarification tank 3 unit for clarification treatment, and the waste acid after clarification treatment is introduced into the intermediate tank unit, and then introduced into the CUM1 unit for purification treatment, wherein the material produced by the clarification treatment and the material produced by the purification treatment are introduced into the filter press 2 for filtration to produce product 2, and the filtrate can be introduced into the mixing tank 3 unit; Step 8: The waste acid purified in the CUM1 unit is introduced into the CUM2 unit for further purification to generate product 3 and produce water.

3. The impurity treatment process for purifying contaminated acid according to claim 2, characterized in that: The pretreatment agent A comprises zinc carbonate, calcium carbonate, calcium oxide, silicon dioxide and hydroxide.

4. The impurity treatment process for purifying contaminated acid according to claim 2, characterized in that: The pretreatment B agent comprises aluminum sulfate, ammonium aluminum sulfate, potassium aluminum sulfate, anhydrous potassium aluminum sulfate, potassium sulfate, aluminum hydroxide and hydroxide.

5. The impurity treatment process for purifying contaminated acid according to claim 2, characterized in that: The pretreatment C reagent composition includes aluminum hydroxide, hydroxide, sodium aluminate, potassium aluminate and potassium hydroxide.

6. The impurity treatment process for purifying contaminated acid according to claim 2, characterized in that: The neutralizing agent comprises aluminum hydroxide, potassium hydroxide and hydroxide.

7. An apparatus for treating impurities for purifying waste acid according to claim 2, comprising a mixing device for mixing waste acid and a pretreatment agent, characterized in that: The mixing device comprises a support frame (1), a mixing cylinder (2) is fixedly mounted in the middle of the support frame (1), a liquid inlet pipe (21) is fixedly mounted on one side of the bottom of the mixing cylinder (2), a liquid outlet pipe (22) is fixedly mounted on one side of the bottom of the mixing cylinder (2) away from the liquid inlet pipe (21), a waste discharge pipe (23) is fixedly mounted on one side of the bottom end of the mixing cylinder (2), a return pipe (24) is fixedly mounted on one side of the bottom end of the mixing cylinder (2) away from the waste discharge pipe (23), a bearing (32) is fixedly mounted in the middle of the top end of the mixing cylinder (2), a mixing middle cylinder (3) is fixedly mounted in the middle of the bearing (32), a plurality of evenly distributed mixing side cylinders (31) are fixedly mounted on the outer side of the mixing middle cylinder (3), a plurality of evenly distributed row holes (301) are opened on the mixing side cylinder (31), the top of the mixing middle cylinder (3) is fixedly mounted with a bearing (32), a mixing middle cylinder (3) is fixedly mounted with a bearing (32), a plurality of evenly distributed row holes (301) are fixedly mounted on the outer side of the mixing middle cylinder (3), a plurality of evenly distributed row holes (301) are opened on the mixing side cylinder (31), a plurality of evenly distributed row holes (301) are opened on the top of the mixing middle cylinder (3), and a plurality of evenly distributed row holes (301) are opened on the mixing side cylinder (31). A sealing rotating member (33) is fixedly mounted at the end, a first tube (34) is fixedly mounted in the middle of the sealing rotating member (33), the first tube (34) is fixedly mounted at the top end of the mixing cylinder (2), a concave platform (6) is fixedly mounted on the lower surface of the inner wall of the mixing cylinder (2), a convex platform (61) is fixedly mounted in the middle of the lower surface of the inner wall of the mixing cylinder (2), a waste discharge groove (601) is formed between the concave platform (6) and the convex platform (61), an auxiliary frame (4) is fixedly mounted on the top and bottom of the outer side of the mixing middle cylinder (3), a longitudinal scraper (41) is fixedly mounted at one end of the auxiliary frame (4) away from the mixing middle cylinder (3), the longitudinal scraper (41) is in contact with the inner wall of the mixing cylinder (2), a transverse scraper (42) is fixedly mounted at the bottom end of the longitudinal scraper (41), the transverse scraper (42) is in contact with the inner wall of the waste discharge groove (601).

8. The device for treating impurities for purifying contaminated acid according to claim 7, characterized in that: The top of the mixing cylinder (3) extends out of the top of the mixing cylinder (2) and is fixedly mounted with a crown gear (5); a driving motor (51) is fixedly mounted on the side of the top of the mixing cylinder (2) close to the crown gear (5); a driving gear (52) is fixedly mounted on the driving end of the driving motor (51); and the driving gear (52) is meshingly connected to the crown gear (5).

9. The impurity treatment process device for purifying contaminated acid according to claim 7, characterized in that: A three-way pipe (35) is fixedly mounted on the end of the first pipe (34); a first pump (351) and a second pump (352) are respectively fixedly mounted on one end of the three-way pipe (35) away from the first pipe (34); a second pipe (353) is fixedly mounted on one end of the first pump (351) away from the first pipe (34); and a third pipe (354) is fixedly mounted on one end of the second pump (352) away from the first pipe (34).

10. The impurity treatment process device for purifying contaminated acid according to claim 7, characterized in that: A first valve (211) is fixedly mounted on the liquid inlet pipe (21), a second valve (221) is fixedly mounted on the liquid outlet pipe (22), a third valve (231) is fixedly mounted on the waste discharge pipe (23), and a fourth valve (241) is fixedly mounted on the return pipe (24).

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