CN206142942U - Wire rope pickling spent acid and contain high zinc, plumbous mud coexistence system of putting - Google Patents

Abstract

The utility model discloses a co-disposal system for steel wire rope pickling waste acid and sludge containing high zinc and lead, which belongs to the technical field of environmental protection and waste water treatment. The utility model co-disposal system of steel wire rope pickling waste acid and sludge containing high zinc and lead includes a mud acid stirring and dissolving device, a lead and zinc removal device, a flocculant preparation device, a hydrogen sulfide absorption device and a lead and zinc precipitation and separation device, wherein The mud acid stirring and dissolving device is connected to the lead-zinc removal device through pipelines, and the lead-zinc removal device is respectively connected to the flocculant preparation device, hydrogen sulfide absorption device and lead-zinc precipitation separation device through pipelines. Using the system of the utility model can realize the co-disposal of waste acid from steel wire rope pickling and high-zinc and lead sludge, can effectively remove zinc and lead elements, and prepare industrial products with higher added value.

Description

A co-disposal system for steel wire rope pickling waste acid and sludge containing high zinc and lead

technical field

The utility model belongs to the field of resource utilization of solid hazardous waste in environmental protection and the field of waste water treatment. Specifically, it relates to a co-disposal system for steel wire rope pickling waste acid and sludge containing high zinc and lead. It is a pickling process for steel wire rope enterprises The waste acid produced and the high-zinc and lead sludge produced in the production process are used as raw materials to prepare value-added industrial products. A resourceful co-disposal system.

Background technique

The steel wire rope is a structure made of at least two layers of steel wire or multiple strands twisted helically around a center or a rope core. The iron oxide layer formed on the surface during the production process needs to be removed by pickling. At present, domestic steel wire rope enterprises mainly pickle with hydrochloric acid. When the concentration of hydrochloric acid drops below 10%, the pickling effect drops significantly and fails to meet the requirements for use, and it needs to be discarded. Steel wire rope pickling waste acid has strong acidity (pH<0) and contains a large amount of toxic and harmful heavy metal elements (lead, zinc, etc.). waste management. Steel wire rope pickling and phosphating production processes will also produce a large amount of acid wastewater containing high zinc and lead. At present, the method of adding alkaline precipitant is widely used to form sludge containing high zinc and lead through neutralization, thereby removing zinc, lead Harmful impurities such as lead make the acid wastewater meet the discharge standard. The water content in high-zinc and lead sludge is usually above 80%. According to HJ/T299 solid waste leaching toxicity method of the Ministry of Environmental Protection, it is determined that high-zinc and lead sludge is hazardous waste and cannot be directly dumped or landfilled. Therefore, most steel wire rope enterprises now pile up high-zinc and lead sludge in the factory area, which not only takes up a lot of space, but also causes heavy metal pollution in the plant soil. When it rains, the zinc and lead in the sludge will migrate with the rainwater. resulting in water pollution.

At present, steel wire rope manufacturers usually treat waste pickling acid and sludge containing high zinc and lead separately. Among them, there are two main ideas for the treatment of waste acid from steel wire rope pickling: the first one is to treat waste acid from steel wire rope pickling as wastewater, adding alkaline materials to the waste acid to precipitate lead and zinc, and then discharge the wastewater directly. This method will produce a large amount of zinc and lead-containing precipitates, which are hazardous wastes that need to be further disposed of at high cost. The second method includes roasting method, distillation crystallization method, replacement method, etc. Its purpose is to recover hydrochloric acid and iron elements in waste acid, but it cannot be used in actual operation due to the disadvantages of high operating costs, poor product quality, and high energy consumption. middle. There are also two main methods for the treatment of high-zinc and lead sludge produced by steel wire rope enterprises: the first is cement solidification, and the second is high-temperature gasification to remove lead. These two methods have high operating costs and require The landfill site, and the metal elements in the sludge have not been disposed of as resources, resulting in a large amount of waste of metal elements. In addition, separate treatment of waste pickling acid and sludge containing high zinc and lead will greatly increase the labor intensity of the manufacturer and increase its treatment cost. Therefore, how to realize efficient treatment of waste acid from pickling of steel wire ropes and high-zinc and lead-containing sludge generated in the production process of steel wire ropes, realize resource utilization, and reduce treatment costs has always been a major problem for steel wire rope manufacturers.

After searching, there are still few researches on the co-disposal of steel wire rope pickling waste acid and high zinc and lead sludge as resources. Among them, CN104843957A discloses a method for comprehensively treating waste hydrochloric acid and alkaline sludge produced in steel wire rope processing. The co-disposal method of stirring to make it fully react and then remove the insoluble matter in the mud, but it does not really realize the resource utilization of pickling waste acid and sludge, but simple mechanical stirring and mixing, and the final product after treatment It is a waste liquid containing high zinc and lead, which is still a hazardous waste and needs further advanced treatment before it can be discharged.

As another example, CN105271436A discloses a method for preparing polyferric chloride flocculant by utilizing steel wire sludge and waste salt. The application is to use sulfide precipitation to remove lead ions, and hydrogen sulfide gas is absorbed by falling film, packed tower and activated carbon. Absorption treatment, the sludge residue is added to cement to solidify, and then the iron recovered from the sludge is used to prepare flocculants. The application does not consider the removal of zinc, but the zinc content in the waste acid and sludge produced by steel wire rope enterprises is extremely high (>40000mg/L), and the zinc needs to be removed before the discharge can meet the standard. At the same time, sulfide precipitation is not considered. The processing of the product requires further processing to realize resource utilization. In addition, in this application, an alkaline solution is added during the preparation of the flocculant, and the quality of the final flocculant is relatively poor, which needs to be further improved.

Utility model content

1. The technical problems to be solved by the utility model

The purpose of this utility model is to overcome the above shortcomings existing in the current steel wire rope manufacturers when they process pickling waste acid and sludge containing high zinc and lead, and provide a co-disposal system for waste pickling acid and sludge containing high zinc and lead . Adopting the technical scheme of the utility model can not only realize the co-disposal of waste acid from steel wire rope pickling and high zinc and lead sludge, but also can effectively and completely remove zinc and lead elements, realize the reduction of hazardous waste, and at the same time overcome the disadvantages of traditional processes Disadvantages, the preparation of industrial products with higher added value has realized resource utilization and brought greater profits to the enterprise.

2. Technical solution

In order to achieve the above object, the technical solution provided by the utility model is:

A co-disposal system of steel wire rope pickling waste acid and sludge containing high zinc and lead of the utility model, including mud acid stirring and dissolving device, lead and zinc removal device, flocculant preparation device, hydrogen sulfide absorption device and lead and zinc precipitation and separation device, wherein the mud acid stirring and dissolving device is connected to the lead-zinc removal device through pipelines, and the lead-zinc removal device is respectively connected to the flocculant preparation device, hydrogen sulfide absorption device and lead-zinc precipitation separation device through pipelines.

Further, the hydrogen sulfide absorbing device includes a hydrogen sulfide absorbing tower A, a hydrogen sulfide absorbing tower B and a hydrogen sulfide absorbing tower C connected in sequence, and the hydrogen sulfide absorbing tower A is connected to the lead-zinc removal device through pipelines. The gas ports are connected, and a hydrogen sulfide leakage alarm is installed on the pipeline between hydrogen sulfide absorption tower B and hydrogen sulfide absorption tower C.

Further, the top of the hydrogen sulfide absorbing device is provided with a spraying device, and the absorbing liquid is sprayed downward through the spraying device to absorb hydrogen sulfide gas.

Further, the described lead-zinc precipitation separation device comprises a lead-zinc precipitation separation device A and a lead-zinc precipitation separation device B, and the lead-zinc precipitation separation device A and the lead-zinc precipitation separation device B are connected with the sewage of the lead-zinc removal device through pipelines. The mud discharge outlets are connected, and the lead-zinc precipitation separation device A and the lead-zinc precipitation separation device B are connected to the lead-zinc removal device with valve A and valve B respectively.

Furthermore, the mud acid stirring and dissolving device, the lead and zinc removal device, the flocculant preparation device and the lead and zinc precipitation and separation device are all equipped with agitators.

Furthermore, lift pumps are provided on the pipelines connecting the lead and zinc removal device with the mud acid stirring and dissolving device and the flocculant preparation device.

Further, the lift pump is an acid-resistant lift pump.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the utility model has the following remarkable effects:

(1) A co-disposal system for steel wire rope pickling waste acid and high-zinc and lead-containing sludge of the present utility model includes mud acid stirring and dissolving device, lead and zinc removal device, flocculant preparation device, hydrogen sulfide absorption device and lead Zinc precipitation and separation device, among them, the mud acid stirring and dissolving device is used to mix and dissolve the sludge to be treated and the waste acid solution, and the lead and zinc removal device is used to remove lead and zinc in the acid solution after dissolving the sludge, and absorb it through hydrogen sulfide The device absorbs and treats the hydrogen sulfide gas generated in the lead-zinc removal device to prevent direct discharge from polluting the environment. At the same time, the sulfide generated in the hydrogen sulfide absorption device can be passed into the lead-zinc removal device for recycling, which is conducive to saving resources. The supernatant produced in the lead and zinc removal device enters the flocculant preparation device for the preparation of flocculant, and the lead and zinc mixed sediment generated in the lead and zinc removal device can be separated and reacted through the setting of the lead and zinc precipitation separation device , to prepare high-purity lead sulfide and zinc acetate industrial products, and realize resource utilization. Adopting the system of the utility model can effectively realize resource co-disposal of steel wire rope pickling waste acid and high-zinc and lead-containing sludge, reduce environmental pollution, and the process operation is simple and can be automatically controlled.

(2) A co-disposal system for steel wire rope pickling waste acid and high-zinc and lead-containing sludge of the present utility model, the hydrogen sulfide absorbing device includes hydrogen sulfide absorbing tower A, hydrogen sulfide absorbing tower B and sulfurized hydrogen sulfide absorbing tower connected in sequence The hydrogen absorption tower C can effectively ensure the sufficient absorption of hydrogen sulfide through the arrangement of three-stage absorption towers, and further reduce environmental pollution. Since the pipeline between hydrogen sulfide absorption tower B and hydrogen sulfide absorption tower C is equipped with a hydrogen sulfide leakage alarm, the hydrogen sulfide contained in the exhaust gas can be monitored to ensure the complete absorption of hydrogen sulfide and prevent the leakage of hydrogen sulfide .

(3) A co-disposal system for steel wire rope pickling waste acid and high-zinc and lead-containing sludge of the present utility model, its lead-zinc precipitation separation device includes lead-zinc precipitation separation device A and lead-zinc precipitation separation device B, through the lead-zinc precipitation separation device The cooperation of the precipitation separation device A and the lead-zinc precipitation separation device B can realize the effective separation of the lead-zinc precipitation and ensure the purity of the obtained separated product.

Description of drawings

Fig. 1 is a structural schematic diagram of a system for co-processing waste acid from steel wire rope pickling and sludge containing high zinc and lead according to the utility model.

In the figure: 1. Mud acid stirring and dissolving device; 2. Lead and zinc removal device; 3. Flocculant preparation device; 4. Hydrogen sulfide absorption tower A; 5. Hydrogen sulfide absorption tower B; 6. Hydrogen sulfide absorption tower C; 7. Hydrogen sulfide leakage alarm; 8. Lead-zinc precipitation and separation device A; 9. Lead-zinc precipitation and separation device B; 10. Valve A; 11. Valve B.

detailed description

As shown in Figure 1, a kind of steel wire rope pickling waste acid of the present utility model and high zinc, lead sludge co-disposal system comprises mud acid stirring and dissolving device 1, lead and zinc removal device 2, flocculant preparation device 3, The hydrogen sulfide absorption device and the lead-zinc precipitation separation device, wherein, the mud acid stirring and dissolving device 1 is connected with the lead-zinc removal device 2 through pipelines, and the lead-zinc removal device 2 is respectively connected with the flocculant preparation device 3 and the hydrogen sulfide absorption device through pipelines It is connected with the lead-zinc precipitation separation device. The above-mentioned mud acid stirring and dissolving device 1, lead and zinc removal device 2, flocculant preparation device 3 and lead and zinc precipitation and separation device are all equipped with stirrers, and the lead and zinc removal device 2 and mud acid stirring and dissolving device 1 and flocculant preparation The pipeline connected to the device 3 is provided with a lift pump, and the lift pump adopts an acid corrosion-resistant lift pump.

The sludge to be treated and the waste acid liquid are mixed, stirred and dissolved by the mud acid stirring and dissolving device 1, and the resulting supernatant is pumped to the lead and zinc removal device 2 by a lifting pump to remove lead and zinc in the acid liquid after dissolving the sludge , so that lead and zinc are precipitated, and the hydrogen sulfide gas generated in the lead-zinc removal device is absorbed through the hydrogen sulfide absorption device to prevent direct discharge from polluting the environment. The device is recycled, which is conducive to saving resources. The supernatant produced in the lead and zinc removal device 2 enters the flocculant preparation device 3 for the preparation of flocculants, and the lead and zinc mixed sediment produced in the lead and zinc removal device 2 can be treated by setting the lead and zinc precipitation separation device Separation reaction is carried out to prepare industrial products of lead sulfide and zinc acetate with high purity, realizing resource utilization. Adopting the system of the utility model can effectively realize resource co-disposal of steel wire rope pickling waste acid and high-zinc and lead-containing sludge, reduce environmental pollution, and the process operation is simple and can be automatically controlled.

Above-mentioned hydrogen sulfide absorber comprises hydrogen sulfide absorber A4, hydrogen sulfide absorber B5 and hydrogen sulfide absorber C6 connected successively, wherein hydrogen sulfide absorber A4 links to each other with the exhaust outlet of lead-zinc removal device 2 by pipeline, above-mentioned hydrogen sulfide The top of the absorption tower is equipped with a spray device, and the absorption liquid sprayed by the spray device absorbs the hydrogen sulfide gas. The setting of the three-stage absorption tower can effectively ensure the sufficient absorption of hydrogen sulfide and further reduce environmental pollution. Since the pipeline between the hydrogen sulfide absorption tower B5 and the hydrogen sulfide absorption tower C6 is provided with a hydrogen sulfide leakage alarm 7, the hydrogen sulfide contained in the exhaust gas can be monitored to ensure the complete absorption of hydrogen sulfide and prevent the leakage of hydrogen sulfide leakage.

Above-mentioned lead-zinc precipitation separation device comprises lead-zinc precipitation separation device A8 and lead-zinc precipitation separation device B9, and lead-zinc precipitation separation device A8 and lead-zinc precipitation separation device B9 all link to each other with the sludge discharge outlet of lead-zinc removal device 2 through pipeline, And lead-zinc precipitation separation device A8 and lead-zinc precipitation separation device B9 are respectively provided with valve A10, valve B11 on the pipeline that lead-zinc precipitation separation device 2 links to each other, through the cooperation of lead-zinc precipitation separation device A and lead-zinc precipitation separation device B can Realize the effective separation of lead and zinc precipitation, and ensure the purity of the separated product.

The utility model relates to a co-disposal process of steel wire rope pickling waste acid and sludge containing high zinc and lead, which involves stirring and dissolving mud acid, removing lead and zinc, preparing polyferric flocculant, purifying hydrogen sulfide tail gas and depositing lead and zinc Separation realizes resource co-disposal of waste steel wire rope pickling acid and sludge containing high zinc and lead, and optimizes the process and process parameters of the above processes, thereby further ensuring the waste acid pickling of steel wire rope and sludge containing high zinc and lead The effect of resource disposal of zinc and lead sludge has greatly reduced the pollution to the environment. The specific steps of the process are:

A. Mud acid stirring and dissolving: Add the sludge to be treated into the mud acid stirring and dissolving device 1, and then continue to add waste acid solution to it, and the amount of sludge added to the mud acid stirring and dissolving device 1 At 1/5-1/2 of the volume, the volume ratio of the waste acid solution to the sludge is 1-10:1. After stirring for 1-4 hours and standing for 1-5 hours, the supernatant is pumped to remove lead and zinc. device 2. By effectively controlling the dosing ratio of waste acid liquid and sludge, as well as the reaction and standing time, the full dissolution of mud acid can be ensured.

After pumping the supernatant to the lead and zinc removal device 2, continue to supplement the sludge in the mud acid stirring and dissolving device 1, and then add the acid solution to carry out the second mixing and dissolving of the sludge waste acid, and so on, after multiple reactions, the The insoluble matter precipitated at the bottom is washed with water and treated as solid waste and directly landfilled. The utility model carries out mud-acid mixing by supplementing sludge, and the sludge is kept in excess during the mixing process, so that the content of total iron in the mud-acid mixture can be increased, thereby ensuring the safety of the flocculant produced in the subsequent sequence. quality. At the same time, the insoluble matter produced by the mud-acid mixing process of the utility model contains relatively less zinc and lead, and its main component is silicon dioxide. After washing with water, it can be directly buried as solid waste, which further reduces the impact on the environment. Pollution, to ensure the effective utilization of resources in pickling waste acid and sludge containing high zinc and lead.

B. Lead and zinc removal: detect the lead and zinc content in the acid solution after dissolving the sludge, add sulfide to the lead and zinc removal device 2, and control the total moles of lead and zinc and the moles of sulfide in the lead and zinc removal device 2 The ratio of numbers, that is, n (lead + zinc): n (sulfide) = 1:2-3, after stirring for 30-60 minutes, filter to remove the precipitate produced by the reaction and lift the supernatant to the flocculant preparation device 3. At the same time, pass the generated hydrogen sulfide gas into the hydrogen sulfide absorption device. The sulfide of the utility model is one or more of sodium sulfide, potassium sulfide, calcium sulfide and sodium hydrosulfide.

C. Preparation of polyferric flocculant: detect the content of Fe ²⁺ and Fe ³⁺ in the solution passed into the flocculant preparation device 3, and configure the mixed solution of oxidizing agent and lye according to its content, wherein, oxidizing agent and Fe ²⁺ The molar ratio of OH- and Fe is 1:6, and the molar ratio of OH ^- to ^Fe is 1-3:1. The above-mentioned mixed solution is added to the flocculant preparation device 3 for stirring reaction. The stirring speed is 50-500r/min, and the stirring reaction The time is 45-120min. After the reaction is finished, the formation treatment is carried out for 20-30h, and then 10%-50% of water is evaporated to make the polyferric flocculant. The above-mentioned oxidizing agent is a mixture of one or two of sodium chlorate and potassium chlorate, and the lye is a mixture of one or more of sodium hydroxide, potassium hydroxide and calcium hydroxide solutions.

The inventor found during the experiment that simply using alkali solution to prepare flocculant cannot obtain better quality flocculant, and the utilization rate of resources is relatively low. The utility model uses the mixed solution of oxidant and alkali To prepare poly-iron flocculants, and optimize the addition of oxidant and lye, so that flocculants with better quality and better basicity can be produced to ensure the use effect of flocculants.

D. Purification of hydrogen sulfide tail gas: absorb the hydrogen sulfide gas passed into the hydrogen sulfide absorption device with saturated lye, and reuse the lye that has fully absorbed hydrogen sulfide into step B. Specifically, the hydrogen sulfide gas is first passed into the hydrogen sulfide absorption tower A4 for absorption treatment, and then passed into the hydrogen sulfide absorption tower B5 for secondary absorption, and the hydrogen sulfide gas after the secondary absorption passes through the hydrogen sulfide leakage alarm 7, If the alarm does not alarm, it will be directly discharged through the hydrogen sulfide absorption tower C6; if the alarm detects the leakage of hydrogen sulfide gas, replace the lye in the hydrogen sulfide absorption tower B5 and the hydrogen sulfide absorption tower C6, and absorb the The lye of hydrogen sulfide is reused in step B. The lye in the hydrogen sulfide absorption tower is one or more than one of sodium hydroxide, potassium hydroxide and calcium hydroxide solutions.

E, lead-zinc precipitation separation: make the lead and zinc mixed precipitate produced in step B enter the lead-zinc precipitation separation device, use the lead acetate solution with a mass concentration of 30%-70% to carry out reaction separation, and obtain lead sulfide with a purity of more than 99% Solid and zinc acetate solid of industrial purity. Specifically, first open the valve A10 on the pipeline between the lead-zinc precipitation separation device A8 and the lead-zinc removal device 2, close the valve B11 on the pipeline between the lead-zinc precipitation separation device B9 and the lead-zinc removal device 2, and remove the lead, zinc Add the mixed precipitate into the lead-zinc precipitation separation device A8, react at a speed of 250-500r/min for 30-45min and let it stand for 30-60 minutes, then transfer the precipitate to the lead-zinc precipitation separation device B9, at 250r/min React at a speed of -500r/min for 30-45min and stand still for 30-60 minutes to take out the precipitate, which is lead sulfide solid with a purity of more than 99%; after multiple reactions, it is detected that the concentration of lead acetate in the lead-zinc precipitation separation device B9 is low Take out the evaporative crystallization at 0.5% and obtain the zinc acetate solid that meets industrial purity; Afterwards, open valve B11, close valve A10, use the lead-zinc precipitation separation device B9 as the device for the first reaction, and replenish new lead-zinc precipitation separation device A8 The lead acetate solution is used as the device for the second reaction, which is carried out successively.

In the prior art, the removal of heavy metal zinc is usually neglected in the treatment of waste acid and sludge from steel wire rope factories. However, the zinc content in waste acid and sludge from steel wire rope factories is huge. If zinc is not effectively removed and discharged directly, It will also cause serious environmental pollution. The utility model can effectively remove the lead and zinc in the waste acid solution and the sludge of the steel wire rope factory at the same time, and purify the final precipitated matter. Among them, the lead-zinc precipitation is separated and purified by selecting a specific concentration of lead acetate solution, and the separation and purification process is optimized through the cooperation of the lead-zinc precipitation separation device A8 and the lead-zinc precipitation separation device B9, so that the lead-zinc precipitation can be effectively guaranteed. The separation effect greatly improves the purity of lead sulfide and zinc acetate industrial products.

In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

Example 1

Referring to Figure 1, add the sludge (moisture content 30%-75%) from the steel wire rope factory to the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration, and the dosage is: add to the mud acid stirring and dissolving At the 1/3 volume of device 1, add waste acid solution (H ⁺ concentration is 13%, lead content is 720mg/L, zinc content is 4000mg/L) in mud acid stirring and dissolving device 1, and the dosage is V (waste acid): V (sludge) = 3:1, that is, the volume is 9 cubic meters. After stirring for 2 hours and standing still for 3 hours, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. After testing, the lead content of the acid solution after dissolving the mud is 799mg/L, and the zinc content is 6940mg/L. Add 230kg of sodium sulfide solid to the lead and zinc removal device 2, stir and react for 30min, and pass the resulting lead and zinc precipitation mixture into the The lead-zinc precipitation separation device conducts separation and purification treatment. After removing the sediment, the supernatant is lifted to the flocculant preparation device 3, and at the same time, the hydrogen sulfide gas generated is passed into the hydrogen sulfide absorption device for absorption treatment. The alkali in the hydrogen sulfide absorption tower Liquid adopts sodium hydroxide solution (in this embodiment, sodium hydroxide solution is stored at the bottom of the absorption tower, and is pumped into the spray device at the top of the absorption tower through pipelines and lift pumps, and the hydrogen sulfide gas is sprayed down by the spray device) absorption, thereby further improving the absorption effect of hydrogen sulfide gas). After testing, the contents of Fe ²⁺ and Fe ³⁺ in the solution after the removal of lead and zinc passed through the flocculant preparation device 3 are respectively: Fe ²⁺ is 78.9g/L, Fe ³⁺ is 21.8g/L, according to Contents of Fe ²⁺ and Fe ³⁺ Configure the mixed solution of oxidant and lye, the sodium chlorate is 225kg, the sodium hydroxide is 141g, after adding water to dissolve, pump it into the flocculant preparation device 3, and stir the reaction at a speed of 350r/min 45min, under natural circumstances, the polyferric flocculant can be obtained after 24 hours of formation.

The flocculant prepared in this embodiment is detected, and the results are as follows:

The flocculant index content that table 1 embodiment 1 prepares

index value Fe ³⁺ 10.2% Fe ²⁺ 0.7% Basicity 8% Water insoluble matter 0.05% density 1.20g/ ^cm3 Zn 0.05% Pb 0.01% CD not detected

The results show that the prepared flocculant complies with the industry standard of HG_T 4672-2014. Use the prepared flocculant to treat printing and dyeing wastewater (turbidity is 100NTU, CODcr is 956mg/L), add 1kg flocculant to ^1m3 sewage, the experiment found that the removal of turbidity can reach about 90%, and the removal rate of COD Up to about 77%.

Example 2

Referring to Figure 1, add the sludge (moisture content 40%-75%) from the steel wire rope factory to the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration. At the 1/2 volume of device 1, add waste acid solution (H ⁺ concentration is 10%, lead content is 4500mg/L, zinc content is 5100mg/L) in mud acid stirring and dissolving device 1, and the dosage is V (waste acid): V (sludge) = 8: 1, that is, the volume is 24 cubic meters. After stirring and reacting for 4 hours and standing still for 5 hours, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. After testing, the lead content of the acid solution after dissolving the mud is 6500mg/L, and the zinc content is 7000mg/L. Add 1101kg of potassium sulfide solids to the lead-zinc removal device 2, stir and react for 60min, and pass the resulting lead-zinc precipitation mixture into the The lead-zinc precipitation separation device conducts separation and purification treatment. After removing the sediment, the supernatant is lifted to the flocculant preparation device 3, and at the same time, the hydrogen sulfide gas generated is passed into the hydrogen sulfide absorption device for absorption treatment. The alkali in the hydrogen sulfide absorption tower The liquid uses potassium hydroxide. Fe ²⁺ and Fe ³⁺ content in the solution after passing into flocculant preparation device 3 to remove lead and zinc, Fe ²⁺ is 225g/L, Fe ³⁺ is 31.6g/L, according to Fe ²⁺ and The content of Fe ³⁺ configures the mixed solution of oxidant and lye, potassium chlorate is 1968kg, potassium hydroxide is 2270kg, after adding water and dissolving, pump it into the flocculant preparation device 3, stir and react with 500r/min for 120min, and naturally form After 30 hours of curing, the polyferric flocculant was obtained.

The prepared flocculant was tested and the results are as follows:

The flocculant index content that table 2 embodiment 2 prepares

index value Fe ³⁺ 12.3% Fe ²⁺ 0.6% Basicity 9% Water insoluble matter 0.08% density 1.50g/ ^cm3 Zn 0.08% Pb 0.007% CD not detected

The results show that the prepared flocculant complies with the industry standard of HG_T 4672-2014. Use the prepared flocculant to treat printing and dyeing wastewater (turbidity is 300NTU, CODcr is 1200mg/L), and 0.9kg flocculant is added to ^1m3 sewage. Experiments show that the removal of turbidity can reach about 84%. The COD removal rate can reach about 68%.

Example 3

Referring to Figure 1, add the sludge (moisture content 40%-75%) of the steel wire rope factory sludge into the mud acid stirring and dissolving device 1, and the dosage is: add to the mud acid stirring and dissolving At 1/5 of the volume of device 1, add waste acid solution (H ⁺ concentration is 12%, lead content is 3000mg/L, zinc content is 4200mg/L) in mud acid stirring and dissolving device 1, and the dosage is V (waste acid): V (sludge) = 10:1, that is, the volume is 30 cubic meters. After stirring and reacting for 1 hour and standing for 1 hour, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. Detect that the lead content of the acid solution after dissolving the mud is 5300mg/L, and the zinc content is 5600mg/L. Add 483.5kg of calcium sulfide solids to the lead-zinc removal device 2, stir and react for 30min, and pass the resulting lead-zinc precipitation mixture into the lead The zinc precipitation separation device performs separation and purification treatment. After removing the sediment, the supernatant is lifted to the flocculant preparation device 3, and at the same time, the hydrogen sulfide gas generated is passed into the hydrogen sulfide absorption device for absorption treatment. The lye in the hydrogen sulfide absorption tower Calcium hydroxide solution is used. Fe ²⁺ and Fe ³⁺ content in the solution after passing into the flocculant preparation device 3 to remove lead and zinc, Fe ²⁺ is 146g/L, Fe ³⁺ is 23.2g/L, according to Fe ²⁺ and The content of Fe ³⁺ configures the mixed solution of oxidant and lye, sodium chlorate is 1387kg, calcium hydroxide is 919kg, after adding water to dissolve, it is pumped into the flocculant preparation device 3, and it is stirred and reacted at a speed of 100r/min for 45min. The polyferric flocculant can be obtained after 20 hours of downgrading.

The prepared flocculant was tested and the results are as follows:

The flocculant index content that table 3 embodiment 3 prepares

index value Fe ³⁺ 10.1% Fe ²⁺ 0.3% Basicity 8% Water insoluble matter 0.03% density 1.20g/ ^cm3 Zn 0.04% Pb 0.008% CD not detected

The results show that the prepared flocculant complies with the industry standard of HG_T 4672-2014. Use the prepared flocculant to treat the printing and dyeing wastewater (turbidity is 400NTU, CODcr is 700mg/L), add 1.2kg flocculant to ^1m3 sewage, the experiment found that the removal of turbidity can reach about 88%. The COD removal rate can reach about 63%.

Example 4

Referring to Figure 1, add the sludge (moisture content 30%-75%) from the steel wire rope factory to the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration, and the dosage is: add to the mud acid stirring and dissolving At the 1/4 volume of device 1, add waste acid solution (H ⁺ concentration is 11%, lead content is 800mg/L, zinc content is 3000mg/L) in mud acid stirring and dissolving device 1, and the dosage is V (waste acid): V (sludge) = 5: 1, that is, the volume is 15 cubic meters. After stirring and reacting for 3 hours and standing still for 2 hours, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. Detect that the lead content of the acid solution after dissolving the mud is 1100mg/L, and the zinc content is 4400mg/L. Add 154kg of sodium hydrogen sulfide solid to the lead-zinc removal device 2, stir and react for 50min, and pass the resulting lead-zinc precipitation mixture into the lead The zinc precipitation separation device performs separation and purification treatment. After removing the precipitate, the supernatant is lifted to the flocculant preparation device 3, and at the same time, the hydrogen sulfide gas generated is passed into the hydrogen sulfide absorption device for absorption treatment. The lye in the hydrogen sulfide absorption tower A mixture of sodium hydroxide, calcium hydroxide and potassium hydroxide is used. Fe ²⁺ and Fe ³⁺ content in the solution after passing into the flocculant preparation device 3 to remove lead and zinc, Fe ²⁺ is 88g/L, Fe ³⁺ is 12g/L, according to Fe ²⁺ and Fe The content of ³⁺ configures a mixture of oxidant and lye, sodium chlorate is 416kg, and sodium hydroxide is 129kg. After adding water to dissolve, pump it into the flocculant preparation device 3, and stir and react at a speed of 450r/min for 70min. After 20 hours of formation, the polyferric flocculant was obtained.

The prepared flocculant was tested and the results are as follows:

The flocculant index content that table 4 embodiment 4 prepares

The results show that the prepared flocculant complies with the industry standard of HG_T 4672-2014. Use the prepared flocculant to treat printing and dyeing wastewater (turbidity is 500NTU, CODcr is 800mg/L), add 0.8kg flocculant to ^1m3 sewage, the experiment found that the removal of turbidity can reach about 79%, COD removal The rate can reach about 76%.

Example 5

Referring to Figure 1, add the sludge (moisture content 30%-75%) from the steel wire rope factory to the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration, and the dosage is: add to the mud acid stirring and dissolving At the 1/4 volume of device 1, add waste acid solution (H ⁺ concentration is 12%, lead content is 900mg/L, zinc content is 3200mg/L) in mud acid stirring and dissolving device 1, and the dosage is V (waste acid): V (sludge) = 1:1, that is, the volume is 3 cubic meters. After stirring for 3 hours and standing still for 4 hours, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. Detect that the lead content of the acid solution after dissolving the mud is 1200mg/L, and the zinc content is 4600mg/L, add 210kg sodium sulfide, potassium sulfide, calcium sulfide and sodium hydrosulfide solid in the lead-zinc removal device 2, stirring reaction 45min, will The resulting lead-zinc precipitation mixture is passed into the lead-zinc precipitation separation device for separation and purification treatment. After the sediment is removed, the supernatant is lifted to the flocculant preparation device 3, and the generated hydrogen sulfide gas is passed into the hydrogen sulfide absorption device for absorption For treatment, the lye in the hydrogen sulfide absorption tower is a mixed solution of sodium hydroxide, calcium hydroxide and potassium hydroxide. Detect Fe ²⁺ and Fe ³⁺ content in the solution after the removal of lead and zinc passed into flocculant preparation device 3, Fe ²⁺ is 90g/L, Fe ³⁺ is 11g/L, according to Fe ²⁺ and Fe The content of ³⁺ configures the mixed solution of oxidant and lye, sodium chlorate is 426kg, sodium hydroxide is 130kg, after adding water to dissolve, pump it into the flocculant preparation device 3, stir and react at a speed of 50r/min for 120min, under natural conditions After 30 hours of formation, the polyferric flocculant was obtained.

The prepared flocculant was tested and the results are as follows:

The flocculant index content that table 5 embodiment 5 prepares

The results show that the prepared flocculant complies with the industry standard of HG_T 4672-2014. Use the prepared flocculant to treat printing and dyeing wastewater (turbidity is 500NTU, CODcr is 800mg/L), add 0.8kg flocculant to ^1m3 sewage, the experiment found that the removal of turbidity can reach about 73%, COD removal The rate can reach about 71%.

The above-mentioned embodiments are only examples for clearly illustrating the utility model, rather than limiting the implementation. For those skilled in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the protection scope of the present utility model.

Claims (7)

1. A co-disposal system for steel wire rope pickling waste acid and sludge containing high zinc and lead, characterized in that: the system includes a mud acid stirring and dissolving device (1), a lead and zinc removal device (2), and a flocculant preparation device (3), hydrogen sulfide absorption device and lead-zinc precipitation separation device, wherein, the mud acid stirring and dissolving device (1) is connected to the lead-zinc removal device (2) through a pipeline, and the lead-zinc removal device (2) is passed through a pipeline They are respectively connected with the flocculant preparation device (3), the hydrogen sulfide absorption device and the lead-zinc precipitation separation device. 2. a kind of steel wire rope pickling waste acid according to claim 1 and contain high zinc, lead sludge co-disposal system, it is characterized in that: described hydrogen sulfide absorption device comprises the hydrogen sulfide absorption tower A (4 ), hydrogen sulfide absorption tower B (5) and hydrogen sulfide absorption tower C (6), described hydrogen sulfide absorption tower A (4) links to each other with the exhaust outlet of lead-zinc removal device (2) through pipeline, and hydrogen sulfide A hydrogen sulfide leakage alarm (7) is provided on the pipeline between the absorption tower B (5) and the hydrogen sulfide absorption tower C (6). 3. The co-disposal system of a kind of steel wire rope pickling waste acid and high-zinc and lead-containing sludge according to claim 2, characterized in that: the top of the hydrogen sulfide absorption device is provided with a spray device, and the spray device The absorbing liquid is sprayed down to absorb the hydrogen sulfide gas. 4. The co-disposal system of a kind of steel wire rope pickling waste acid and high-zinc and lead-containing sludge according to claim 1, characterized in that: the lead-zinc precipitation separation device comprises a lead-zinc precipitation separation device A (8) and lead-zinc precipitation separation device B (9), lead-zinc precipitation separation device A (8) and lead-zinc precipitation separation device B (9) are all connected to the sludge discharge port of the lead-zinc removal device (2) through pipelines, and the lead A valve A (10) and a valve B (11) are respectively provided on the pipelines connecting the zinc precipitation separation device A (8) and the lead-zinc precipitation separation device B (9) to the lead-zinc removal device (2). 5. A kind of steel wire rope pickling waste acid according to any one of claims 1-4 and co-disposal system containing high zinc and lead sludge, is characterized in that: described mud acid stirring and dissolving device (1), The lead and zinc removal device (2), the flocculant preparation device (3) and the lead and zinc precipitation separation device are all provided with agitators. 6. A kind of steel wire rope pickling waste acid according to any one of claims 1-4 and the co-disposal system of sludge containing high zinc and lead, is characterized in that: the lead and zinc removal device (2) is combined with mud acid The pipes connected to the stirring and dissolving device (1) and the flocculant preparation device (3) are all provided with lift pumps. 7. A system for co-disposal of waste acid from steel wire pickling and high-zinc and lead-containing sludge according to claim 6, characterized in that: the lift pump is an acid-resistant lift pump.