A kind of dewatered sludge curing agent, preparation method and use method

Abstract

A dewatered sludge solidifying agent, a preparation method and a use method, belonging to the technical field of environmental engineering, the phosphate rock, carbide slag, tailings slag and marble slag in the dewatered sludge solidifying agent are (1-3) by mass percentage: (1 ~3):(1~3):(1~3), the preparation method comprises: washing, drying, crushing and ball milling the phosphate rock, calcium carbide slag, tailings slag and marble slag respectively, and mixing them in proportion uniform. The method of using the dewatered sludge solidifying agent includes: mixing the dewatered sludge and the added dewatered sludge solidifying agent in proportion to achieve solidification. The compressive strength of the cured dewatered sludge can reach 78KPa after 3 days of curing under normal temperature and pressure, and the pH of the leachate is between 5 and 10. The dewatered sludge solidifying agent of the present invention uses solid waste as a raw material, has wide sources of raw materials and low cost, and utilizes the chemical properties of the solid waste itself and the activity excitation between them to realize the solidification and stabilization of the dewatered sludge.

Description

technical field

[0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a dewatered sludge solidifying agent, a preparation method and a use method. Background technique

[0002] Sludge is a kind of viscous substance produced in the process of sewage treatment. It is mainly composed of aerobic and anaerobic microorganisms. A complex mixture of organic matter, metals, germs, insect eggs, colloids, etc. For sewage treatment plants in large cities, due to the large amount of industrial wastewater discharged into the system, the heavy metal content in sewage sludge is relatively high, and the content of lead, arsenic, and cadmium is often close to or exceeds the acceptance standard for sludge as agricultural compost The sludge discharged from the sewage treatment plant is generally a loose, colloidal paste with a water content of 80% to 90%. Very bad for handling and shipping.

[0003] At present, the disposal technologie...

Examples

Embodiment 1

[0023] The dewatered sludge solidifying agent in this embodiment is composed of phosphate rock, calcium carbide slag, tailings slag and marble slag, and the composition is phosphate rock: carbide slag: tailings slag: marble slag = 1:1:1:1 Mixing; wherein, the phosphorus grade of phosphate rock is 25%, and the Ca(OH) of carbide slag 2 The grade is 65%, and the particle size of phosphate rock, carbide slag, tailings slag and marble slag is ≦100 mesh.

[0024] The composition of phosphate rock is: 25% of fluorapatite, 19% of quartz, 50% of dolomite; the composition of calcium carbide slag is: 65% of calcium oxide, 12% of quartz, 2% of magnesium oxide, Aluminum 0.5%, ferric oxide 1%; tailings slag contains 42% of quartz, 5% of aluminum oxide and 7% of ferric oxide by mass percentage; marble slag contains calcium carbonate by mass percentage 50%, Quartz 9%, Alumina 25%.

[0025] The preparation method of the dewatered sludge solidifying agent of the present embodiment may further...

Embodiment 2

[0033] The dewatered sludge solidifying agent in this embodiment is composed of phosphate rock, carbide slag, tailings slag and marble slag, and the composition is phosphate rock: carbide slag: tailings slag: marble slag = 3:2:3:2 Mixing; wherein, the phosphorus grade of phosphate rock is 28%, and the Ca(OH) of carbide slag 2 The grade is 62%, and the particle size of phosphate rock, carbide slag, tailings slag and marble slag are all ≦100 mesh.

[0034] The composition of phosphate rock is: 22% of fluorapatite, 13% of quartz, 60% of dolomite; the composition of calcium carbide slag is: 62% of calcium oxide, 6% of quartz, 5% of magnesium oxide, Aluminum 1%, ferric oxide 1%; tailings slag contains 24% of quartz, 10% of alumina, 6% of ferric oxide; marble slag contains calcium carbonate 50% for quartz, 12% for quartz, and 24% for alumina.

[0035] The preparation method of the dewatered sludge solidifying agent of the present embodiment may further comprise the steps:

[0036...

Embodiment 3

[0043]The dewatered sludge solidifying agent in this embodiment is composed of phosphate rock, calcium carbide slag, tailings slag and marble slag, and the composition is phosphate rock: carbide slag: tailings slag: marble slag = 1:2:1:2 Mixing; wherein, the phosphorus grade of phosphate rock is 30%, and the Ca(OH) of carbide slag 2 The grade is 68%, and the particle size of phosphate rock, carbide slag, tailings slag and marble slag are all ≦100 mesh.

[0044] The composition of phosphate rock is: 29% of fluorapatite, 42% of quartz, 16% of dolomite; the composition of calcium carbide slag is: 65% of calcium oxide, 15% of quartz, 3% of magnesium oxide, Aluminum 0.6%, ferric oxide 2%; tailings slag contains 29% of quartz, 8% of aluminum oxide and 5% of ferric oxide by mass percentage; marble slag contains calcium carbonate by mass percentage 55% for quartz, 10% for quartz, and 25% for alumina.

[0045] The preparation method of the dewatered sludge solidifying agent of the pr...

technical field

[0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a dewatered sludge solidifying agent, a preparation method and a use method. Background technique

[0002] Sludge is a kind of viscous substance produced in the process of sewage treatment. It is mainly composed of aerobic and anaerobic microorganisms. A complex mixture of organic matter, metals, germs, insect eggs, colloids, etc. For sewage treatment plants in large cities, due to the large amount of industrial wastewater discharged into the system, the heavy metal content in sewage sludge is relatively high, and the content of lead, arsenic, and cadmium is often close to or exceeds the acceptance standard for sludge as agricultural compost The sludge discharged from the sewage treatment plant is generally a loose, colloidal paste with a water content of 80% to 90%. Very bad for handling and shipping.

[0003] At present, the disposal technologie...

Examples

Embodiment 1

[0023] The dewatered sludge solidifying agent in this embodiment is composed of phosphate rock, calcium carbide slag, tailings slag and marble slag, and the composition is phosphate rock: carbide slag: tailings slag: marble slag = 1:1:1:1 Mixing; wherein, the phosphorus grade of phosphate rock is 25%, and the Ca(OH) of carbide slag 2 The grade is 65%, and the particle size of phosphate rock, carbide slag, tailings slag and marble slag is ≦100 mesh.

[0024] The composition of phosphate rock is: 25% of fluorapatite, 19% of quartz, 50% of dolomite; the composition of calcium carbide slag is: 65% of calcium oxide, 12% of quartz, 2% of magnesium oxide, Aluminum 0.5%, ferric oxide 1%; tailings slag contains 42% of quartz, 5% of aluminum oxide and 7% of ferric oxide by mass percentage; marble slag contains calcium carbonate by mass percentage 50%, Quartz 9%, Alumina 25%.

[0025] The preparation method of the dewatered sludge solidifying agent of the present embodiment may further...

Embodiment 2

[0033] The dewatered sludge solidifying agent in this embodiment is composed of phosphate rock, carbide slag, tailings slag and marble slag, and the composition is phosphate rock: carbide slag: tailings slag: marble slag = 3:2:3:2 Mixing; wherein, the phosphorus grade of phosphate rock is 28%, and the Ca(OH) of carbide slag 2 The grade is 62%, and the particle size of phosphate rock, carbide slag, tailings slag and marble slag are all ≦100 mesh.

[0034] The composition of phosphate rock is: 22% of fluorapatite, 13% of quartz, 60% of dolomite; the composition of calcium carbide slag is: 62% of calcium oxide, 6% of quartz, 5% of magnesium oxide, Aluminum 1%, ferric oxide 1%; tailings slag contains 24% of quartz, 10% of alumina, 6% of ferric oxide; marble slag contains calcium carbonate 50% for quartz, 12% for quartz, and 24% for alumina.

[0035] The preparation method of the dewatered sludge solidifying agent of the present embodiment may further comprise the steps:

[0036...

Embodiment 3

[0043]The dewatered sludge solidifying agent in this embodiment is composed of phosphate rock, calcium carbide slag, tailings slag and marble slag, and the composition is phosphate rock: carbide slag: tailings slag: marble slag = 1:2:1:2 Mixing; wherein, the phosphorus grade of phosphate rock is 30%, and the Ca(OH) of carbide slag 2 The grade is 68%, and the particle size of phosphate rock, carbide slag, tailings slag and marble slag are all ≦100 mesh.

[0044] The composition of phosphate rock is: 29% of fluorapatite, 42% of quartz, 16% of dolomite; the composition of calcium carbide slag is: 65% of calcium oxide, 15% of quartz, 3% of magnesium oxide, Aluminum 0.6%, ferric oxide 2%; tailings slag contains 29% of quartz, 8% of aluminum oxide and 5% of ferric oxide by mass percentage; marble slag contains calcium carbonate by mass percentage 55% for quartz, 10% for quartz, and 25% for alumina.

[0045] The preparation method of the dewatered sludge solidifying agent of the pr...