Ferrous sulfide cleaning solution and preparation method thereof

Abstract

The invention discloses a ferrous sulfide cleaning solution and a preparation method thereof, the cleaning solution is prepared from a suspending agent, a penetrant, a deoxidant, a solid deodorization passivator and water according to a certain weight part ratio, and the solid deodorization passivator is prepared from an oxidant, an activator, a passivator and a hydrogen sulfide inhibitor. During cleaning, the cleaning agent can permeate into a FeS deposition layer to enable the FeS deposition layer to loosen and fall off, FeS is converted into a soluble iron complex, secondary deposition of iron elements is avoided, cleaning waste liquid does not contain heavy metal ions, pollution to the environment is reduced, the treatment difficulty and treatment cost of the cleaning waste liquid are reduced, and the environmental pollution is reduced as much as possible; besides, in the cleaning process, generation of H2S can be reduced as much as possible, hydrogen sulfide can be adsorbed, release of hydrogen sulfide is inhibited, odor is eliminated, poison of hydrogen sulfide to operators is reduced, air pollution is reduced, and the cleaning agent is green and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the field of cleaning of petroleum pipelines and equipment, in particular to a ferrous sulfide cleaning fluid and a preparation method thereof. Background Art

[0002] Imported crude oil often contains high sulfur content (for example, Middle Eastern crude oil can contain up to 2% to 5%). During the crude oil refining process, the sulfides in the crude oil easily react with the metal surfaces of pipelines and refining equipment, generating large amounts of FeS, which adheres to the equipment and pipelines. During downtime for maintenance, FeS attached to pipelines and equipment can easily oxidize in the air and release heat, leading to spontaneous combustion and fires, causing significant damage to the pipelines and equipment. Furthermore, the H2S produced by oxidation not only pollutes the environment but also affects the health and even lives of maintenance personnel. Therefore, ferrous sulfide must be removed during maintenance of crude oil pipelines or equipment.

[0003] Existing FeS cleaning solutions primarily include chemical and biological cleaning solutions. Chemical cleaning solutions can be divided into oxidant and chelate types based on their cleaning principle. Oxidant-type cleaning solutions primarily use potassium permanganate as an oxidant to oxidize FeS. While potassium permanganate is relatively inexpensive, its passivation effect is poor, leaving areas of poor cleaning potential. The manganese ions produced by the reaction pose a risk of heavy metal contamination, increasing the cost of cleaning wastewater treatment. Chelating-type cleaning solutions primarily chelate the iron in FeS through a chelating action, promoting its decomposition. However, existing chelating-type cleaning solutions primarily use EDTA as a chelating agent, which has poor biodegradability and is difficult to decompose in the environment, potentially causing environmental pollution. Furthermore, these cleaning solutions are sensitive to pH values ​​and can only function within a certain pH range, resulting in significant limitations.

[0004] In summary, it is urgent to research and develop a ferrous sulfide cleaning fluid that has good deodorization and passivation effects on FeS, has little impact on crude oil pipelines and equipment, and is environmentally friendly. Summary of the Invention

[0005] In view of this, the first object of the present invention is to provide a ferrous sulfide cleaning solution, and the second object of the present invention is to provide a method for preparing the ferrous sulfide cleaning solution.

[0006] The ferrous sulfide cleaning liquid of the present invention is prepared by a suspending agent, a penetrant, a deoxidizer, a solid deodorizing passivating agent and water in the following weight ratios: 0.1 to 1.5 parts of the suspending agent, 2 to 10 parts of the penetrant, 0 to 2 parts of the deoxidizer, 5 to 40 parts of the solid deodorizing passivating agent and 100 parts of water; Among them, the suspending agent is low-viscosity sodium carboxymethyl cellulose and / or low-viscosity polyanionic cellulose, the deoxidizer is sodium nitrite and / or sodium sulfite; the penetrant is sodium salt of di-sec-octyl sulfosuccinate and / or polyoxyethylene; and the solid deodorizing passivator is prepared from an oxidant, an activator, a passivator and a hydrogen sulfide inhibitor.

[0007] The beneficial effects are as follows: during cleaning, the cleaning liquid of the present invention can penetrate into the FeS deposit layer, causing the FeS deposit layer to loosen and fall off, and the iron in the FeS is eventually converted into a soluble iron complex, effectively avoiding the redeposition of iron; in addition, the cleaning waste liquid generated by cleaning does not contain heavy metal ions, thereby reducing pollution to the environment and reducing the difficulty of treating the cleaning waste liquid; the cleaning liquid of the present invention can reduce the generation of H2S as much as possible during actual use and can adsorb H2S, thereby inhibiting the release of hydrogen sulfide, eliminating odor, reducing the toxicity of hydrogen sulfide to operators, and reducing air pollution, being green, environmentally friendly, and highly safe.

[0008] Preferably, the weight ratio of the solid deodorizing passivating agent is: 10-60 parts of oxidizing agent, 10-60 parts of activating agent, 5-40 parts of passivating agent, and 5-30 parts of hydrogen sulfide inhibitor; wherein the oxidizing agent is sodium persulfate, potassium persulfate, and / or potassium ferrate; the activating agent is citric acid, sulfamic acid, and / or gluconic acid; the passivating agent is acetone oxime, 2-hydroxybenzaldehyde oxime, thiourea, and / or imidazoline quaternary ammonium salt; and the hydrogen sulfide inhibitor is zinc oxide, diatomaceous earth, and / or kaolin. More preferably, the weight ratio of the solid deodorizing passivating agent is: 20-50 parts of oxidizing agent, 20-40 parts of activating agent, 10-30 parts of passivating agent, and 10-20 parts of hydrogen sulfide inhibitor.

[0009] In a more preferred embodiment of the present invention, the weight ratio of the suspending agent, penetrant, deoxidizer, solid deodorizing passivator and water is: 0.3-1.0 parts of suspending agent, 2-6 parts of penetrant, 0-1.5 parts of deoxidizer, 10-30 parts of solid deodorizing passivator, and 100 parts of water.

[0010] The present invention also proposes a method for preparing a ferrous sulfide cleaning liquid, which comprises the following steps: adding 0.1 to 1.5 parts of a suspending agent to 100 parts of water, stirring to dissolve the suspending agent in the water; then adding 0 to 2 parts of an oxygen scavenger and stirring evenly; then adding 2 to 10 parts of a penetrant and continuing to stir; and finally adding 5 to 40 parts of a solid deodorizing passivating agent and stirring to obtain the ferrous sulfide cleaning liquid. The preparation process of the solid deodorizing passivating agent is as follows: first, the oxidizing agent and the activating agent are mixed and crushed once, then the passivating agent is added and crushed twice, and finally, the hydrogen sulfide inhibitor is added and crushed three times. The pulverizing speeds of the first, second and third pulverizing processes are 4000 to 10000 r / min, and the pulverizing times of the first, second and third pulverizing processes are all 5 to 20 min.

[0011] More preferably, the pulverizing speed of the first pulverizing, the second pulverizing and the third pulverizing is 4000-7000 r / min; the pulverizing time of the first pulverizing, the second pulverizing and the third pulverizing is 8-12 min.

[0012] Compared with the prior art, the cleaning liquid of the present invention is prepared from a suspending agent, a penetrant, an oxygen scavenger, a solid deodorizing passivating agent, and water. The synergistic effect of these agents enables the present invention to effectively remove FeS deposits on metal surfaces, convert the iron in FeS into a soluble complex, minimize the generation of H2S, and adsorb H2S. This results in a good cleaning effect and can also achieve deodorization (the odor comes from H2S). In addition, the preparation method is simple, the conditions are mild, and large-scale industrial production can be achieved, thus having good application prospects.

[0013] The suspending agent in the present invention uniformly suspends the solid particles, ensures uniform dispersion of the solid particles, avoids precipitation, and further ensures the uniformity and stability of the entire cleaning liquid system; the penetrant effectively reduces the surface tension of the cleaning liquid, thereby improving the permeability of the present invention, ensuring that the cleaning liquid of the present invention can penetrate the FeS deposition layer, ensuring the cleaning effect of the deposition layer; the deoxidizer can remove dissolved oxygen in the cleaning liquid, reduce the contact between the metal surfaces of pipelines and equipment and oxygen, and protect the metal surfaces from corrosion as much as possible.

[0014] The solid deodorizing passivating agent in the cleaning solution of the present invention can penetrate into the FeS deposition layer attached to the inner wall of the pipe or equipment under the action of the penetrant, and oxidize FeS into SO4 2- The iron ions and the activator form a stable water-soluble complex (for example, when the activator is citric acid, Fe3(C6H5O7)2 can be generated), which avoids the redeposition of iron and has a good cleaning effect. In addition, the present invention uses potassium persulfate, sodium persulfate and / or potassium ferrate as an oxidant, and the cleaning waste liquid generated by cleaning does not contain heavy metal ions, which reduces pollution to the environment and reduces the difficulty of treating the cleaning waste liquid. Moreover, the S part of the FeS cleaning process is oxidized to generate SO4 2- , reducing the generation of H2S, and the present invention can adsorb H2S and inhibit the release of H2S, which not only eliminates the odor, but also reduces the impact of H2S on the health of cleaning personnel, reduces air pollution, and is green and environmentally friendly.

[0015] The deoxidizer in the cleaning liquid of the present invention is sodium nitrite and / or sodium sulfite, which can remove dissolved oxygen in the cleaning liquid and reduce the contact between oxygen and the metal surface during the cleaning process; in addition, the passivator in the cleaning liquid can be adsorbed on the metal surface and form a protective film. The combination of the deoxidizer and the passivator can physically isolate the metal surface of the pipeline or equipment from the air, further avoiding corrosion of the metal surface of the pipeline or equipment caused by cleaning. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0017] The invention provides a ferrous sulfide cleaning liquid, which is prepared from a suspending agent, a penetrant, a deoxidizer, a solid deodorizing passivator and water in the following weight ratio: 0.1-1.5 parts of suspending agent, 2-10 parts of penetrant, 0-2 parts of deoxidizer, 5-40 parts of solid deodorizing passivator and 100 parts of water; wherein the suspending agent is low-viscosity sodium carboxymethyl cellulose and / or low-viscosity polyanionic cellulose (one of which can be selected or used in any combination), the deoxidizer is sodium nitrite and / or sodium sulfite (one of which can be selected or used in any combination), and the penetrant is sodium di-sec-octyl sulfosuccinate and / or polyethylene oxide (one of which can be selected or used in any combination).

[0018] In actual preparation, the optimal weight ratio of the ferrous sulfide cleaning solution of the present invention is: 0.3-1.0 parts of suspending agent, 2-6 parts of penetrant, 0-1.5 parts of deoxidizer, 10-30 parts of solid deodorizing passivator, and 100 parts of water.

[0019] The solid deodorizing passivator of the present invention is prepared from an oxidizing agent, an activating agent, a passivating agent and a hydrogen sulfide inhibitor, wherein the specific weight ratio is 10 to 60 parts of the oxidizing agent, 10 to 60 parts of the activating agent, 5 to 40 parts of the passivating agent and 5 to 30 parts of the hydrogen sulfide inhibitor. The oxidizing agent is sodium persulfate, potassium persulfate and / or potassium ferrate; the activating agent is citric acid, aminosulfonic acid and / or gluconic acid; the passivating agent is acetone oxime, 2-hydroxybenzaldehyde oxime, thiourea and / or imidazoline quaternary ammonium salt; and the hydrogen sulfide inhibitor is zinc oxide, diatomaceous earth and / or kaolin.

[0020] In actual preparation, any one of the three oxidants can be used, any two of them can be mixed together, or any three of them can be used; similarly, any one of the three activators can be used, any two of them can be mixed together, or any three of them can be used; any one of the four passivators can be used, or any one of them can be mixed together; and any one of the three hydrogen sulfide inhibitors can be used, or any one of them can be mixed together.

[0021] More preferably, the weight ratio of the solid deodorizing passivating agent is: 20 to 50 parts of oxidant, 20 to 40 parts of activator, 10 to 30 parts of passivating agent, and 10 to 20 parts of hydrogen sulfide inhibitor.

[0022] The present invention also proposes a method for preparing a ferrous sulfide cleaning liquid, which specifically comprises the following steps: adding a suspending agent to 100 parts of water, stirring to dissolve the suspending agent in the water; then adding an oxygen scavenger, stirring for 10 minutes; then adding a penetrant, stirring continuously; and finally adding 5 to 40 parts of a solid deodorizing passivating agent, stirring for 10 minutes. The preparation process of the solid deodorizing passivator is as follows: the oxidant and the activator are first mixed and crushed once, then the passivator is added and crushed twice, and finally the hydrogen sulfide inhibitor is added and crushed three times; the crushing speed of the first crushing, the second crushing and the third crushing is 4000-10000 r / min (preferably 4000-7000 r / min), and the crushing time of each crushing is 5-20 min (preferably controlled at 8-12 min).

[0023] 1. Preparation of the solid deodorizing passivating agent of the present invention Example 1 Add 20 g of sodium persulfate and 40 g of citric acid into a grinder and grind at 5000 r / min for 10 min; then add 20 g of acetone oxime and grind at 5000 r / min for 10 min; finally add 20 g of zinc oxide and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivating agent, which is recorded as RCCDG-1.

[0024] Example 2 Add 30 g of potassium persulfate and 35 g of aminosulfonic acid to a grinder and grind at 5000 r / min for 10 min; then add 10 g of acetone oxime and 10 g of imidazoline quaternary ammonium salt and grind at 5000 r / min for 10 min; finally, add 15 g of kaolin and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivator, which is recorded as RCCDG-2.

[0025] Example 3 Add 40 g of potassium ferrate and 25 g of aminosulfonic acid to a grinder and grind at 5000 r / min for 10 min; then add 15 g of 2-hydroxybenzaldehyde oxime and 10 g of thiourea and grind at 5000 r / min for 10 min; finally, add 10 g of diatomaceous earth and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivator, recorded as RCCDG-3.

[0026] Example 4 Add 40 g of potassium persulfate and 20 g of gluconic acid to a grinder and grind at 5000 r / min for 10 min; then add 15 g of acetone oxime and 15 g of thiourea and grind at 5000 r / min for 10 min; finally add 10 g of zinc oxide and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivating agent, recorded as RCCDG-4.

[0027] Example 5 Add 50 g of potassium ferrate and 25 g of citric acid to a grinder and grind at 5000 r / min for 10 min; then add 5 g of acetone oxime and 5 g of thiourea and grind at 5000 r / min for 10 min; finally, add 15 g of diatomaceous earth and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivating agent, recorded as RCCDG-5.

[0028] Example 6 Add 45 g of sodium persulfate and 35 g of aminosulfonic acid to a grinder and grind at 5000 r / min for 10 min; then add 5 g of 2-hydroxybenzaldehyde oxime and 5 g of imidazoline quaternary ammonium salt and grind at 5000 r / min for 10 min; finally, add 10 g of diatomaceous earth and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivator, which is recorded as RCCDG-6.

[0029] Example 7 Add 45 g of potassium persulfate and 30 g of citric acid to a grinder and grind at 5000 r / min for 10 min; then add 15 g of acetone oxime and grind at 5000 r / min for 10 min; finally, add 10 g of diatomaceous earth and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivating agent, which is recorded as RCCDG-7.

[0030] Second, the present invention used FeS (analytical grade) as the treatment target. Sulfuric acid was added to a container containing FeS to generate H2S. The deodorization performance of the solid deodorizing passivators in Examples 1-7 of the present invention against hydrogen sulfide was examined. It should be noted that due to the toxicity of H2S, the entire experimental procedure was conducted in a laboratory fume hood. Specifically, the following procedures were included: (1) A certain mass of FeS is placed in a conical flask, 90 mL of deionized water is added, and then 10 mL of 0.3 mol / L dilute sulfuric acid (excess) is added to allow the FeS and sulfuric acid to react completely. Then, nitrogen or air is gently blown into the conical flask to remove hydrogen sulfide on the liquid surface, and then the conical flask is sealed. In order to meet the deodorization performance of different solid deodorizing passivators for H2S, the reactions of FeS and sulfuric acid in this step are carried out in parallel. (2) Place three of the conical flasks (sealed) after the above reaction in a constant temperature water bath at 50°C and stabilize for 20 minutes. Open the lid of the conical flask and immediately measure the H2S content in the bottle mouth (using a portable H2S meter). The H2S value in the bottle mouth at this time is recorded as X 1 (take the average); (3) Add 2g of solid deodorant passivator RCCDG-1 to each of the conical flasks after the reaction in (1), cover them (three in parallel), shake for 5 minutes to mix thoroughly, then place them in a constant temperature water bath at 50℃ and stabilize for 20 minutes. Then open the lid and measure the H2S content in the conical flask mouth, which is recorded as X 2 (Take the average value); repeat this step to obtain the other solid deodorizing passivators RCCDG-2 to RCCDG-7 X 2 ; (4) According to the H2S value of the untreated group (i.e. X 1 ) and H2S value after treatment with solid deodorizing passivating agent (i.e. X 2 ), calculate and determine the deodorization capacity of Examples 1 to 7 for H2S, and the deodorization capacity is expressed as H2S removal rate R express, R =( X 1 - X 2 )* 100% / X 1 , the results are shown in Table 1.

[0031] Table 1 Deodorization ability of Examples 1 to 7 As can be seen from the above, the solid deodorizing passivator of the present invention has excellent deodorizing ability, with a hydrogen sulfide removal rate of more than 95%, laying a foundation for the green removal of FeS attached to the inner wall of pipelines or equipment.

[0032] 3. The present invention prepares different ferrous sulfide cleaning solutions based on RCCDG-6 Example 8 Add 0.5 g of low-viscosity carboxymethyl cellulose sodium salt to 100 g of clean water and stir at 600 r / min for 10 min; then add 2 g of di-sec-octyl sulfosuccinate sodium salt and stir at 600 r / min for 10 min; then add 30 g of RCCDG-6 and stir at 600 r / min for 10 min. After stirring evenly, ferrous sulfide cleaning solution 1 was obtained.

[0033] Example 9 Add 1 g of low-viscosity polyanionic cellulose to 100 g of clean water and stir at 600 r / min for 10 min; then add 4 g of polyoxyethylene ether and stir at 600 r / min for 10 min; then add 1 g of sodium nitrite and stir at 600 r / min for 10 min; finally, add 25 g of RCCDG-6 and stir at 600 r / min for 10 min to obtain ferrous sulfide cleaning solution 2.

[0034] Example 10 Add 0.3 g of low-viscosity sodium carboxymethyl cellulose to 100 g of clean water and stir at 600 r / min for 10 min; then add 6 g of polyoxyethylene ether and stir at 600 r / min for 10 min; then add 0.5 g of sodium nitrite and stir at 600 r / min for 10 min; finally, add 25 g of RCCDG-6 and stir at 600 r / min for 10 min to obtain ferrous sulfide cleaning solution 3.

[0035] Example 11 Add 1 g of low-viscosity polyanionic cellulose to 100 g of clean water and stir at 600 r / min for 10 min; then add 6 g of sodium di-sec-octyl sulfosuccinate and stir at 600 r / min for 10 min; then add 1.5 g of sodium persulfate and stir at 600 r / min for 10 min; finally, add 20 g of RCCDG-6 and stir at 600 r / min for 10 min to obtain ferrous sulfide cleaning solution 4.

[0036] Example 12 Add 1 g of low-viscosity sodium carboxymethyl cellulose to 100 g of clean water and stir at 600 r / min for 10 min; then add 5 g of sodium di-sec-octyl sulfosuccinate and stir at 600 r / min for 10 min; then add 1.5 g of sodium nitrite and stir at 600 r / min for 10 min; finally, add 25 g of RCCDG-6 and stir at 600 r / min for 10 min to obtain ferrous sulfide cleaning solution 5.

[0037] 4. Comparative Examples Comparative Example 1 The difference between this comparative example and Example 9 is that the comparative cleaning liquid uses a comparative solid deodorizing passivating agent instead of RCCDG-6 in Example 9. The difference between the comparative solid deodorizing passivating agent in this comparative example and RCCDG-6 is that no hydrogen sulfide inhibitor is added to the comparative solid deodorizing passivating agent, as follows: Add 45 g of sodium persulfate and 35 g of aminosulfonic acid to a grinder, and grind at 5000 r / min for 10 min; then add 5 g of 2-hydroxybenzaldehyde oxime and 5 g of imidazoline quaternary ammonium salt, and grind at 5000 r / min for 10 min. Mix well to obtain a solid deodorizing passivator, which is recorded as a comparative solid deodorizing passivator.

[0038] Comparative Example 2 This comparative example uses potassium permanganate as a comparative cleaning agent.

[0039] V. The present invention used waste liquid (containing FeS contamination) discharged from the crude oil vacuum distillation process at a Zhejiang petrochemical company as an actual sample to examine the cleaning effects of Examples 8-12 and Comparative Examples 1-2. It should be noted that due to the toxicity of H2S, the entire experiment was conducted in a laboratory fume hood. The hydrogen sulfide removal efficiency determination process for Examples 8-12 of the present invention is as follows: Take a certain amount of waste liquid sample and place it in a conical flask, add dilute sulfuric acid and seal it, then place it in a 50℃ environment to react for 10 minutes to allow FeS and sulfuric acid to react completely; open the lid and measure the H2S content in the conical flask mouth, which is recorded as X 1 ’ ; In order to meet the requirements of Examples 8-12 and Comparative Examples 1-2, the reaction was carried out in parallel; After the constant temperature reaction for 10 minutes, the multiple conical flasks were divided into multiple groups, and 2 mL of Examples 8-12 and Comparative Examples 1-2 were added to each group and sealed. They were shaken for 5 minutes to mix. Then, each group of conical flasks was placed in a constant temperature water bath at 50°C for 60 minutes. Then, the lids were opened and the H2S content in the conical flask mouth was measured and recorded as X 2 ’ (Three parallel runs, take the average value); According to the H2S before and after treatment with ferrous sulfide cleaning solution (i.e. X 1 ’ and X 2 ’ ), determine the H2S removal rate of Examples 8-12 and Comparative Examples 1-2 R ， , R ， =( X 1 ， - X 2 ， )* 100% / X 1 ， , see Table 2 for details.

[0040] Table 2 Cleaning ability of the ferrous sulfide cleaning solution of the present invention As can be seen from the above, the removal rate of Comparative Example 1 is only 29.8%, and the H2S removal rate of conventional potassium permanganate is only 30.6%. Compared with Comparative Examples 1-2, the ferrous sulfide cleaning solution of the present invention has a removal rate of hydrogen sulfide in ferrous sulfide dirt exceeding 97%. The results show that the ferrous sulfide cleaning solution of the present invention has a good cleaning effect on the discharge of vacuum distillation equipment in crude oil refining.

[0041] In summary, the ferrous sulfide cleaning liquid of the present invention can adsorb hydrogen sulfide and inhibit its release, eliminate odor, reduce the toxicity of hydrogen sulfide to operators, and reduce air pollution. The present invention can penetrate the FeS deposit layer, loosen and fall off the deposit layer, and convert the FeS into a soluble iron complex. This not only avoids the redeposition of iron and eliminates heavy metal ions in the cleaning waste liquid, reducing pollution to the environment and reducing the difficulty of treating the cleaning waste liquid, but also reduces the generation of H2S, can also adsorb H2S and inhibit its release, further protecting operators, reducing environmental pollution, and being environmentally friendly. In addition, the present invention is simple to prepare and uses mild conditions, and can be prepared and used immediately.

[0042] Finally, it should be pointed out that the above is only a preferred example of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A ferrous sulfide cleaning solution, characterized in that: The invention is prepared by mixing a suspending agent, a penetrant, an oxygen scavenger, a solid deodorizing passivating agent and water in the following weight proportions: 0.1-1.5 parts of suspending agent, 2-10 parts of penetrant, 0-2 parts of oxygen scavenger, 5-40 parts of solid deodorizing passivating agent and 100 parts of water; Among them, the suspending agent is low-viscosity sodium carboxymethyl cellulose and / or low-viscosity polyanionic cellulose, the deoxidizer is sodium nitrite and / or sodium sulfite; the penetrant is sodium salt of di-sec-octyl sulfosuccinate and / or polyoxyethylene; and the solid deodorizing passivator is prepared from an oxidant, an activator, a passivator and a hydrogen sulfide inhibitor.

2. The ferrous sulfide cleaning solution according to claim 1, wherein: The weight ratio of the solid deodorizing passivator is: 10 to 60 parts of oxidant, 10 to 60 parts of activator, 5 to 40 parts of passivator, and 5 to 30 parts of hydrogen sulfide inhibitor; wherein the oxidant is sodium persulfate, potassium persulfate and / or potassium ferrate; the activator is citric acid, aminosulfonic acid and / or gluconic acid; the passivator is acetone oxime, 2-hydroxybenzaldehyde oxime, thiourea and / or imidazoline quaternary ammonium salt; and the hydrogen sulfide inhibitor is zinc oxide, diatomaceous earth and / or kaolin.

3. The ferrous sulfide cleaning solution according to claim 2, wherein: The weight ratio of the solid deodorizing passivating agent is: 20 to 50 parts of oxidant, 20 to 40 parts of activator, 10 to 30 parts of passivating agent, and 10 to 20 parts of hydrogen sulfide inhibitor.

4. The ferrous sulfide cleaning solution according to claim 1, wherein: The weight ratio of the suspending agent, penetrant, deoxidizer, solid deodorizing passivator and water is: 0.3-1.0 part of suspending agent, 2-6 parts of penetrant, 0-1.5 parts of deoxidizer, 10-30 parts of solid deodorizing passivator and 100 parts of water.

5. A method for preparing the ferrous sulfide cleaning solution according to any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: adding 0.1 to 1.5 parts of a suspending agent to 100 parts of water, stirring to dissolve the suspending agent in the water; then adding 0 to 2 parts of an oxygen scavenger, stirring evenly; then adding 2 to 10 parts of a penetrant, and continuing to stir; and finally adding 5 to 40 parts of a solid deodorizing passivating agent, stirring to obtain the ferrous sulfide cleaning solution.

6. The method for preparing the ferrous sulfide cleaning solution according to claim 5, wherein: The preparation process of the solid deodorizing passivator is as follows: first, the oxidant and the activator are mixed and crushed once, then the passivator is added and crushed twice, and finally the hydrogen sulfide inhibitor is added and crushed three times; The pulverizing speeds of the first, second and third pulverizing processes are 4000 to 10000 r / min, and the pulverizing times of the first, second and third pulverizing processes are all 5 to 20 min.

7. The method for preparing the ferrous sulfide cleaning solution according to claim 6, wherein: The pulverizing speed of the first pulverizing, second pulverizing and third pulverizing is 4000-7000 r / min; the pulverizing time of the first pulverizing, second pulverizing and third pulverizing is 8-12 min.

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