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Method for preparing novel ceramsite from iron tailings and biogas residues

A technology for iron tailings and biogas slag, applied in the field of materials, can solve the problems of easily polluting the environment, the heavy metal components cannot be effectively solidified and treated, etc., and achieve the effect of solving secondary pollution.

Inactive Publication Date: 2020-07-10
中冶武汉冶金建筑研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heavy metal components in the iron tailings components have not been effectively solidified and processed, which is easy to pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The iron oxide content in the iron tailings used in the invention is between 10% and 17%.

[0030] The sludge is a slurry with a water content of 63%. The sludge is discharged from the urban domestic pipeline in Wuhan, and its SiO 2 and Al 2 o 3 And its mineral composition accounts for about 41% of the dry weight.

[0031] The biogas slag is the bottom mud of the East Lake. After the gas is heated and dissipated completely, the high-temperature combustion test shows that the organic matter content is 38%. The undigested fiber mass accounted for 34% of the total mass was obtained by stirring and filtering the suspended solids.

[0032] The preparation process is as follows: the iron tailings, biogas slag and sludge are preliminarily dehydrated through a dehydrator to reduce the moisture content to below 30%, and then the iron tailings, biogas slag and sludge are sent to an oven and dried at 100°C for 4 hours to constant temperature. Finally, in terms of weight fractio...

Embodiment 2

[0039] The content of iron oxide in the iron tailings used in the present invention is between 10% and 20%.

[0040] The sludge is a slurry with a water content of 60%. The sludge discharged from the steelmaking plant in Wuhan is used, and its SiO 2 and Al 2 o 3 And its mineral composition accounts for about 68% of the dry weight mass.

[0041] The biogas residue is the filter residue of manure from livestock farms. After the gas is heated and dissipated completely, the high-temperature combustion test shows that the organic matter content is 31%, and the undigested fiber obtained by stirring and filtering the suspended matter accounts for 42% of the total mass.

[0042] The preparation process is as follows: firstly, the iron tailings, biogas slag and sludge are preliminarily dehydrated through a dehydrator to reduce the moisture content to below 30%, and then the iron tailings, biogas slag and sludge are sent to an oven for drying at 100°C by means of a conveyor belt. Dry f...

Embodiment 3

[0047] The iron oxide content in the iron tailings used in the invention is between 15% and 20%.

[0048] The silt is a slurry with a water content of 70%, and the bottom silt of the black and odorous water body of the river channel reconstruction in Wuhan City is used, and its SiO 2 and Al 2 o 3 And its mineral composition accounts for about 68% of the dry weight mass.

[0049] The biogas slag is the precipitated filtrate of the urban domestic waste treatment plant. After the gas is heated and dissipated completely, the high-temperature combustion test shows that the organic matter content is 30%, and the undigested fiber mass accounted for 32% of the total mass is obtained by stirring and filtering the suspended solids.

[0050] The preparation process is as follows: firstly, the iron tailings, biogas slag and sludge are preliminarily dehydrated through a dehydrator to reduce the moisture content to below 30%, and then the iron tailings, biogas slag and sludge are sent to ...

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Abstract

The invention discloses a method for preparing novel ceramsite from iron tailings and biogas residues. The method comprises the following steps: drying the iron tailings, the biogas residues and sludge to constant weight, respectively grinding the iron tailings, the biogas residues and the sludge by a grinder until the particle size of the biogas residues is less than or equal to 0.15 mm, the particle size of the sludge is less than or equal to 0.5 mm and the particle size of the iron tailings is less than or equal to 1mm, and uniformly mixing in a raw material bin to obtain a mixture; sendingthe obtained mixture into a slurry pool, uniformly spraying a sodium carbonate aqueous solution, uniformly stirring, and carrying out sealed aging for 24-48 hours to obtain slurry; granulating the slurry into green balls, and sending the green balls into a blast dryer for drying to constant weight; and conveying the dried green balls into a high-temperature sintering furnace, roasting for 10-20 minutes at the temperature of 1050-1100 DEG C, and cooling along with the furnace to obtain the novel ceramsite. The product obtained by the invention can be respectively used for building light aggregate, sewage biological treatment and sewage source biological filtering, and wastes such as iron tailings and biogas residues are effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing novel ceramsite by using iron tailings and methane slag. Background technique [0002] Porous ceramsite has a wide range of uses, such as lightweight concrete aggregates, thermal insulation and sound insulation materials, sewage treatment, water treatment filter materials, etc. At present, most of the production is made of fly ash and clay as the main raw materials, and the preparation of ceramsite from iron tailings has not yet been realized. The production of iron tailings in my country is huge, but at this stage, the iron tailings are only piled up and buried, so that the remaining iron contained in it cannot be used, and a large area of ​​land will be occupied. [0003] In recent years, there has also been related research on the preparation of ceramsite from special tailings. The Chinese invention patent with the publication number CN102...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B38/02C04B38/06
CPCC04B33/1324C04B33/1321C04B33/132C04B33/1328C04B38/009C04B2235/3201C04B2235/5427C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B38/02C04B38/0645C04B38/0067C04B38/0074Y02P40/60
Inventor 吴世明曾明周紫晨张冰王智
Owner 中冶武汉冶金建筑研究院有限公司