CN105254166A - Dewatered sludge curing agent and preparing method and using method thereof - Google Patents
Dewatered sludge curing agent and preparing method and using method thereof Download PDFInfo
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- CN105254166A CN105254166A CN201510779534.3A CN201510779534A CN105254166A CN 105254166 A CN105254166 A CN 105254166A CN 201510779534 A CN201510779534 A CN 201510779534A CN 105254166 A CN105254166 A CN 105254166A
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- dewatered sludge
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Abstract
The invention discloses a dewatered sludge curing agent and a preparing method and using method thereof and belongs to the technical field of environment engineering. The mass ratio of phosphate ore, carbide slag, tailing slag and marble slag in the dewatered sludge curing agent is (1-3) : (1-3) : (1-3) : (1-3). The preparing method comprises the steps of washing, drying, breaking and ball-milling phosphate ore, carbide slag, tailing slag and marble slag and then mixing phosphate ore, carbide slag, tailing slag and marble slag evenly in proportion. According to the using method of the dewatered sludge curing agent, dewatered sludge and the added dewatered sludge curing agent are evenly stirred in proportion to achieve curing. The compressive strength of cured dewatered sludge can reach 78 KPa after cured dewatered sludge is cured under a membrane for three days at normal temperature and normal pressure, and pH of leachate is 5-10. According to the dewatered sludge curing agent, solid waste is taken as the raw material, the sources of the raw material are wide, the cost of the raw material is low, and curing stability of dewatered sludge is realized by means of the chemical property of solid waste and mutual active excitation.
Description
Technical field
The invention belongs to field of environment engineering technology, particularly a kind of dewatered sludge solidifying agent, preparation method and using method.
Background technology
Mud is a kind of sticky mass produced in sewage treatment process, it is based on aerobic, anaerobion, be also mixed into simultaneously in raw waste water with the mixture of silt particle, fiber, plant and animal residues and the absorption Various Complex such as organism, metal, germ, worm's ovum, colloid thereon.For the sewage work of large size city, system is entered owing to there being a large amount of trade effluents, cause the heavy metal content in sewage sludge higher, wherein lead, arsenic, cadmium content often close to or exceed the receiving standard of mud as agricultural compost, the mud of discharging from sewage work be generally a kind of loose, water content 80% ~ 90% glue-dissolving shape lotion thing, there is light specific gravity, bulky, not easily dehydration, very easily corrupt stench physics and chemistry feature, be thus extremely unfavorable for process and transport.
At present, the disposal technology for China's mud mainly contains burning, compost, landfill etc., but wherein the most easily by China's national situation what accept is sludge pretreatment landfill, sewage sludge harmlessness process can not only be ensured, and meet the economic level of current China.The common mode of pre-treatment landfill is sludge curing stabilizing surface treatment, and the solidification treatment of mud refers to mud granule is cementing by physics and chemistry method, fusion and is wrapped in closely knit inert base, forms a kind of process of the good cured body of globality; The stabilization of mud changes poisonous in mud, noxious pollutant into low-solubility, low migration and hypotoxic material process, and sludge curing stabilization is current the most frequently used sludge pretreatment landfill stabilization technology.
Existing dewatered sludge solidifying agent addition content, generally between 15% ~ 30%, causes the increase-volume of sludge curing body larger, is difficult to realize sludge reduction process, be therefore badly in need of the dewatered sludge solidifying agent that a kind of solidification and stabilization is effective, addition content is low.
Summary of the invention
For prior art Problems existing, the invention provides a kind of dewatered sludge solidifying agent, preparation method and using method, this solidifying agent adopts solid waste to be raw material, utilizes solid waste self chemical property and mutual activity excitation, achieves the solidification and stabilization of dewatered sludge.
Dewatered sludge solidifying agent of the present invention, be made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=(1 ~ 3): (1 ~ 3): (1 ~ 3): (1 ~ 3) mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 22 ~ 35%, the Ca (OH) of carbide slag
2grade is 62 ~ 75%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle Du Jun≤100 order.
Wherein, Rock Phosphate (72Min BPL) contains composition and is by mass percentage: fluorapatite 20 ~ 38%, quartz 13 ~ 42%, rhombspar 16 ~ 69%; Carbide slag contains composition: calcium oxide 60 ~ 75%, quartz 6 ~ 15%, magnesium oxide 2 ~ 5%, aluminum oxide 0.50 ~ 1%, ferric oxide 1 ~ 3%; Mine tailings contain composition: quartz is 20 ~ 75%, and aluminum oxide is 5 ~ 10%, and ferric oxide is 3 ~ 7%; Dali rock ballast contains composition: calcium carbonate is 50 ~ 70%, and quartz is 8 ~ 12%, and aluminum oxide is 15 ~ 25%.
The preparation method of dewatered sludge solidifying agent of the present invention, comprises the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 105 ~ 110 DEG C of conditions dry 6 ~ 8h;
Step 2, adopt crusher that Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm respectively step by step, then adopt ball mill to carry out ball milling respectively, after broken, ball milling various ore grain footpath all≤100 orders;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
In the step 2 of the preparation method of above-mentioned dewatered sludge solidifying agent, adopt jaw crusher that Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are carried out fragmentation, adopt vertical-type planetary ball mill to carry out ball milling.
In the step 2 of the preparation method of above-mentioned dewatered sludge solidifying agent, the Ball-milling Time of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast is 4 ~ 6h, preferred 4h;
The using method of dewatered sludge solidifying agent of the present invention, comprises the following steps:
By dewatered sludge and dewatered sludge solidifying agent, be 1:(0.05 ~ 0.1 in mass ratio) join mixing and blending machine, stir 4 ~ 6min at normal temperatures, stir, realize the solidification of dewatered sludge.
Dewatered sludge used in the using method of above-mentioned dewatered sludge solidifying agent, is taken from sewage work, and its water content is lower than 90%.
Beneficial effect of the present invention:
1, Rock Phosphate (72Min BPL), mine tailings, carbide slag and Dali rock ballast are all through washing, broken, ball milling pretreatment, remove soluble salt wherein, avoid soluble salt on the impact of follow-up hydration reaction, improve gelling reaction intensity.
2, the phosphorus in Rock Phosphate (72Min BPL) can and mud in plurality of heavy metal element form insolubles, thus realize the stabilization of heavy metal; Carbide slag not only can excite the activating oxide in mine tailings and Dali rock ballast, generate the solidification that sial base gel realizes mud, mud ultimate compression strength is improved, can also conditioning of mud system be strong basicity, ensure fully exciting of activating oxide in mine tailings and Dali rock ballast, the sial base gel of generation can realize the solidification of dewatered sludge.
3, this solidifying agent adopts solid waste to be raw material, and raw material sources are extensive, cost is low, utilize solid waste self chemical property and mutual activity excitation, achieve the solidification and stabilization of dewatered sludge.
4, compared with traditional method, adopt the solidification and stabilization of this solidifying agent dewatered sludge effective, and prepare easy, the dewatered sludge after solidification does not cause secondary pollution to environment.
Embodiment
Embodiment 1
The dewatered sludge solidifying agent of the present embodiment, is made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, and composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=1:1:1:1 mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 25%, the Ca (OH) of carbide slag
2grade is 65%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle Du Jun≤100 order.
Rock Phosphate (72Min BPL) contains composition: fluorapatite 25%, quartz 19%, rhombspar 50%; Carbide slag contains composition: calcium oxide 65%, quartz 12%, magnesium oxide 2%, aluminum oxide 0.5%, ferric oxide 1%; Mine tailings contain composition: quartz 42%, and aluminum oxide is 5%, and ferric oxide is 7%; Dali rock ballast contains composition: calcium carbonate is 50%, and quartz is 9%, and aluminum oxide is 25%.
The preparation method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 105 DEG C of conditions, dry 6h;
Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm by step 2, employing jaw crusher respectively step by step, and adopt vertical-type planetary ball mill to carry out ball milling respectively, Ball-milling Time is 4h, various ore grain footpath≤100 order after fragmentation, ball milling;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
The using method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Dewatered sludge is added to mixing and blending machine, and add dewatered sludge solidifying agent, the mass ratio of dewatered sludge and dewatered sludge solidifying agent is 1:0.05, under normal temperature condition, starts stirrer and stirs 4min, stir, realize the solidification of dewatered sludge.
Dewatered sludge in the present embodiment after solidification is in the maintenance of normal temperature and pressure overlay film after 3 days, and adopting universal testing machine to measure its ultimate compression strength is 55KPa; According to standard HJ557-2010, adopt horizontal vibration method, measure the pH of leach liquor with pH meter, pH is 6.3.
Embodiment 2
The dewatered sludge solidifying agent of the present embodiment, is made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, and composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=3:2:3:2 mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 28%, the Ca (OH) of carbide slag
2grade is 62%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle Du Jun≤100 order.
Rock Phosphate (72Min BPL) contains composition: fluorapatite 22%, quartz 13%, rhombspar 60%; Carbide slag contains composition: calcium oxide 62%, quartz 6%, magnesium oxide 5%, aluminum oxide 1%, ferric oxide 1%; Mine tailings contain composition: quartz is 24%, and aluminum oxide is 10%, and ferric oxide is 6%; Dali rock ballast contains composition: calcium carbonate is 50%, and quartz is 12%, and aluminum oxide is 24%.
The preparation method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 107 DEG C of conditions, dry 7h;
Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm by step 2, employing jaw crusher respectively step by step, and adopt vertical-type planetary ball mill to carry out ball milling respectively, Ball-milling Time is equal 4h, various ore grain footpath≤100 order after fragmentation, ball milling;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
The using method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Dewatered sludge is added to mixing and blending machine, and add dewatered sludge solidifying agent, the mass ratio of the dewatered sludge solidifying agent of dewatered sludge and interpolation is 1:0.07, under normal temperature condition, starts stirrer and stirs 6min, stir, realize the solidification of dewatered sludge.
Dewatered sludge in the present embodiment after solidification is in the maintenance of normal temperature and pressure overlay film after 3 days, and adopting universal testing machine to measure its ultimate compression strength is 58KPa; According to standard HJ557-2010, adopt horizontal vibration method, measure the pH of leach liquor with pH meter, pH is 7.8.
Embodiment 3
The dewatered sludge solidifying agent of the present embodiment, is made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, and composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=1:2:1:2 mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 30%, the Ca (OH) of carbide slag
2grade is 68%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle Du Jun≤100 order.
Rock Phosphate (72Min BPL) contains composition: fluorapatite 29%, quartz 42%, rhombspar 16%; Carbide slag contains composition: calcium oxide 65%, quartz 15%, magnesium oxide 3%, aluminum oxide 0.6%, ferric oxide 2%; Mine tailings contain composition: quartz is 29%, and aluminum oxide is 8%, and ferric oxide is 5%; Dali rock ballast contains composition: calcium carbonate is 55%, and quartz is 10%, and aluminum oxide is 25%.
The preparation method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 110 DEG C of conditions, dry 8h;
Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm by step 2, employing jaw crusher respectively step by step, and adopt vertical-type planetary ball mill to carry out ball milling respectively, Ball-milling Time is 4h, various ore grain footpath≤100 order after fragmentation, ball milling;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
The using method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Dewatered sludge is added to mixing and blending machine, and add dewatered sludge solidifying agent, the mass ratio of the dewatered sludge solidifying agent of dewatered sludge and interpolation is 1:0.1, under normal temperature condition, starts stirrer and stirs 6min, stir, realize the solidification of dewatered sludge.
Dewatered sludge in the present embodiment after solidification is in the maintenance of normal temperature and pressure overlay film after 3 days, and adopting universal testing machine to measure its ultimate compression strength is 65KPa; According to standard HJ557-2010, adopt horizontal vibration method, measure the pH of leach liquor with pH meter, pH is 9.3.
Embodiment 4
The dewatered sludge solidifying agent of the present embodiment, is made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, and composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=1:3:1:3 mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 22%, the Ca (OH) of carbide slag
2grade is 75%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle Du Jun≤100 order.
Rock Phosphate (72Min BPL) contains composition: fluorapatite 30%, quartz 21%, rhombspar 31%; Carbide slag contains composition: calcium oxide 67%, quartz 10%, magnesium oxide 4%, aluminum oxide 0.9%, ferric oxide 1.5%; Mine tailings contain composition: quartz is 31%, and aluminum oxide is 8%, and ferric oxide is 4%; Dali rock ballast contains composition: calcium carbonate is 57%, and quartz is 11%, and aluminum oxide is 23%.
The preparation method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 105 DEG C of conditions, dry 6h;
Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm by step 2, employing jaw crusher respectively step by step, and adopt vertical-type planetary ball mill to carry out ball milling respectively, Ball-milling Time is 4h, various ore grain footpath≤100 order after fragmentation, ball milling;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
The using method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Dewatered sludge is added to mixing and blending machine, and add dewatered sludge solidifying agent, the mass ratio of the dewatered sludge solidifying agent of dewatered sludge and interpolation is 1:0.05, under normal temperature condition, starts stirrer and stirs 5min, stir, realize the solidification of dewatered sludge.
Dewatered sludge in the present embodiment after solidification is in the maintenance of normal temperature and pressure overlay film after 3 days, and adopting universal testing machine to measure its ultimate compression strength is 60KPa; According to standard HJ557-2010, adopt horizontal vibration method, measure the pH of leach liquor with pH meter, pH is 7.3.
Embodiment 5
The dewatered sludge solidifying agent of the present embodiment, is made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, and composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=2:1:2:3 mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 35%, the Ca (OH) of carbide slag
2grade is 70%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle Du Jun≤100 order.
Rock Phosphate (72Min BPL) contains composition: fluorapatite 35%, quartz 34%, rhombspar 19%; Carbide slag contains composition: calcium oxide 70%, quartz 9%, magnesium oxide 4.5%, aluminum oxide 0.7%, ferric oxide 1%; Mine tailings contain composition: quartz is 38%, and aluminum oxide is 5%, and ferric oxide is 3%; Dali rock ballast contains composition: calcium carbonate is 64%, and quartz is 12%, and aluminum oxide is 25%.
The preparation method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 105 DEG C of conditions, dry 8h;
Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm by step 2, employing jaw crusher respectively step by step, and adopt vertical-type planetary ball mill to carry out ball milling respectively, Ball-milling Time is 4h, various ore grain footpath≤100 order after fragmentation, ball milling;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
The using method of the dewatered sludge solidifying agent of the present embodiment, comprises the following steps:
Dewatered sludge is added to mixing and blending machine, and add dewatered sludge solidifying agent, the mass ratio of the dewatered sludge solidifying agent of dewatered sludge and interpolation is 1:0.05, under normal temperature condition, starts stirrer and stirs 4min, stir, realize the solidification of dewatered sludge.
Dewatered sludge in the present embodiment after solidification is in the maintenance of normal temperature and pressure overlay film after 3 days, and adopting universal testing machine to measure its ultimate compression strength is 78KPa; According to standard HJ557-2010, adopt horizontal vibration method, measure the pH of leach liquor with pH meter, pH is 7.9.
Claims (7)
1. a dewatered sludge solidifying agent, it is characterized in that: be made up of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, composition is Rock Phosphate (72Min BPL) in mass ratio: carbide slag: mine tailings: Dali rock ballast=(1 ~ 3): (1 ~ 3): (1 ~ 3): (1 ~ 3) mixes; Wherein, the phosphorus grade of Rock Phosphate (72Min BPL) is 22 ~ 35%, the Ca (OH) of carbide slag
2grade is 62 ~ 75%, Rock Phosphate (72Min BPL), carbide slag, mine tailings and marble slag particle degree all≤100 orders.
2. dewatered sludge solidifying agent according to claim 1, is characterized in that: Rock Phosphate (72Min BPL) contains composition and is by mass percentage: fluorapatite 20 ~ 38%, quartz 13 ~ 42%, rhombspar 16 ~ 69%; Carbide slag contains composition: calcium oxide 60 ~ 75%, quartz 6 ~ 15%, magnesium oxide 2 ~ 5%, aluminum oxide 0.50 ~ 1%, ferric oxide 1 ~ 3%; Mine tailings contain composition: quartz is 20 ~ 75%, and aluminum oxide is 5 ~ 10%, and ferric oxide is 3 ~ 7%; Dali rock ballast contains composition: calcium carbonate is 50 ~ 70%, and quartz is 8 ~ 12%, and aluminum oxide is 15 ~ 25%.
3. the preparation method of dewatered sludge solidifying agent according to claim 1, is characterized in that, comprise the following steps:
Step 1, by Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast, respectively with water cleaning after, under 105 ~ 110 DEG C of conditions dry 6 ~ 8h;
Step 2, adopt crusher that Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are crushed to below 1mm respectively step by step, then adopt ball mill to carry out ball milling respectively, after broken, ball milling various ore particle diameter all≤100 orders;
Step 3, at normal temperatures, Rock Phosphate (72Min BPL) after treatment, carbide slag, mine tailings and Dali rock ballast to be mixed according to the proportioning of dewatered sludge solidifying agent, form dewatered sludge solidifying agent.
4. the preparation method of dewatered sludge solidifying agent according to claim 3, is characterized in that: in described step 2, adopts jaw crusher that Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast are carried out fragmentation, adopts vertical-type planetary ball mill to carry out ball milling.
5. the preparation method of dewatered sludge solidifying agent according to claim 3, is characterized in that: in described step 2, and the Ball-milling Time of Rock Phosphate (72Min BPL), carbide slag, mine tailings and Dali rock ballast is 4 ~ 6h.
6. the using method of dewatered sludge solidifying agent according to claim 1, is characterized in that, comprise the following steps:
By dewatered sludge and dewatered sludge solidifying agent, be 1 in mass ratio: (0.05 ~ 0.1) joins mixing and blending machine, stirs 4 ~ 6min at normal temperatures, stirs, realize the solidification of dewatered sludge.
7. the using method of dewatered sludge solidifying agent according to claim 6, it is characterized in that: dewatered sludge used is taken from sewage work, its water content is lower than 90%.
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| CN105967752A (en) * | 2016-05-09 | 2016-09-28 | 武汉理工大学 | Preparation method of sheet materials with low pollution by using city sludge and calcium carbide slags |
| CN105967752B (en) * | 2016-05-09 | 2018-11-30 | 武汉理工大学 | Utilize the method for municipal sludge and carbide slag preparation low pollution plate |
| CN106865926A (en) * | 2017-03-09 | 2017-06-20 | 中交疏浚技术装备国家工程研究中心有限公司 | One kind has filled municipal sludge curing agent and its deep dehydration method |
| CN107381993A (en) * | 2017-09-05 | 2017-11-24 | 常州大学 | A kind of method using steel plant's pickling iron containing sludge hot setting electroplating sludge |
| CN110818209A (en) * | 2019-11-11 | 2020-02-21 | 河北诚润环保工程有限公司 | River and lake sludge solidification ecological slope protection treatment process |
| CN111470751A (en) * | 2020-04-26 | 2020-07-31 | 虞克夫 | Dredged sludge curing agent, preparation method and use method |
| CN111847922A (en) * | 2020-07-23 | 2020-10-30 | 虞克夫 | Iron ore tailing curing agent, preparation method and use method |
| CN111875303A (en) * | 2020-07-23 | 2020-11-03 | 虞克夫 | Gold tailing curing agent, preparation method and use method |
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