Recycling method for zinc-containing waste residue and urban domestic sludge

An urban domestic sludge and recycling technology, applied in the field of resource utilization of zinc-containing waste residue and urban domestic sludge, can solve the problems of ineffective recovery, large equipment investment, complicated sludge incineration technology, etc. Simple ingredients, saving land resources, and significant environmental protection effects

Inactive Publication Date: 2013-06-26
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The landfill treatment method is simple, but it takes up a lot of land and space, and improper treatment will cause groundwater pollution; the sludge incineration technology is relatively complicated, and the energy consumption is high, and its equipment investment is large, and the treatment cost is high (a sludge incineration treatment method and sludge incineration treatment device, publication number CN102775034A, publication date: November 12, 2012); composting can treat sludge simply and effectively (urban domestic sludge rapid, hygienic and harmless composting treatment technology, publication number CN102060575A, publication date 2011 May 18, 2009), but special attention should be paid to the pollution of soil by toxic substances (such as heavy metals) in sludge
Utilizing urban domestic sludge as a binder for preparing sintered bricks can remove its pollution to the environment and be effectively utilized (a sintered light-weight environmentally friendly brick produced from municipal sludge and its manufacturing method, publication number CN102051943A, published dated May 11, 2011), but the process raw material ingredients in the application document are complex, and when preparing environmentally friendly bricks, only adding polymer heavy metal collectors to remove heavy metals does not effectively recover the valuable metals

Method used

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  • Recycling method for zinc-containing waste residue and urban domestic sludge
  • Recycling method for zinc-containing waste residue and urban domestic sludge
  • Recycling method for zinc-containing waste residue and urban domestic sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Investigate the effect of reducing conditions on the properties of fired bricks

[0018] The zinc smelting waste slag used in the experiment is Guizhou native zinc smelting waste slag, which contains SiO 2 34.44%, T Fe 10.23%, Al 2 o 3 13.03%, T C 17%, Zn7.15%, Pb0.34%. Pass the crushed zinc smelting waste slag through a 2mm sieve for later use; mix 60% of the zinc smelting waste slag and 40% municipal domestic sludge, age at room temperature for 24 hours, and press to form under a pressure of 5 MPa; Dry the wet billet at 105°C for 8 hours to obtain a dry billet, place the dry billet in a high-temperature closed furnace for reduction and volatilization, the reduction temperature is 1000-1200°C, and the reduction time is 4-10 hours, and the volatile matter is collected to obtain zinc-rich fumes; Into the air for oxidation sintering, the oxidation temperature is 1000 ℃, and the oxidation time is 6h; cooling with the furnace to obtain the finished sintered b...

Embodiment 2

[0024] Example 2 Investigating the influence of oxidation conditions on the properties of fired bricks

[0025] The zinc smelting waste slag used in the experiment is Guizhou native zinc smelting waste slag, which contains SiO 2 43.01%, T Fe 8.57%, Al 2 o 3 16.73%, T C15.65%, Zn3.57%, Pb0.82%. Pass the crushed zinc smelting waste slag through a 2mm sieve for later use; mix 60% of the zinc smelting waste slag and 40% municipal domestic sludge, age at room temperature for 24 hours, and press to form under a pressure of 5 MPa; The wet billet is dried at 105°C for 8 hours to obtain a dry billet, which is reduced and volatilized in a high-temperature closed furnace. The reduction temperature is 1100°C and the reduction time is 8 hours. The volatile matter is collected to obtain zinc-rich smoke; The temperature is 900~1100℃, and the oxidation time is 2~8h; it is cooled with the furnace to obtain the finished sintered brick. According to the standard HJ / T299-2007 "Solid waste l...

Embodiment 3

[0031] Example 3 Investigate the effect of raw material ratio on the properties of fired bricks

[0032] The zinc smelting waste slag used in the experiment is Guizhou native zinc smelting waste slag, which contains SiO 2 23.91%, T Fe 14.86%, Al 2 o 3 9.58%, T C 20.8%, Zn1.28%, Pb0.55%. Crumble all the zinc smelting waste slag through a 2mm sieve and set aside; mix 80-40% of the zinc smelting waste slag and 20-60% urban sewage sludge and age at room temperature for 24 hours, Down compression molding; the wet billet was dried at 105°C for 8 hours to obtain a dry billet, and the dry billet was placed in a high-temperature closed furnace for reduction and volatilization, the reduction temperature was 1100°C, and the reduction time was 8 hours, and the volatile matter was collected to obtain zinc-rich fumes; Into the air for oxidation sintering, the oxidation temperature is 1000 ℃, and the oxidation time is 6h; cooling with the furnace to obtain the finished sintered brick. ...

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Abstract

The invention relates to a recycling method for zinc-containing waste residue and urban domestic sludge. The recycling method comprises the following steps of: a, crushing and sieving the indigenous zinc-smelting waste residues; b, uniformly mixing 40%-80% (in percentage by weight) of the indigenous zinc-smelting waste residues with 20%-60% of urban domestic sludges, and ageing the mixture under the normal temperature; c, pressing and forming the aged mixture, an drying the pressed and formed mixture to obtain a dry body; d, reducing and volatilizing the dry body in a high-temperature sealed furnace, and collecting the volatile component to obtain the zinc-enriched smoke dust, wherein the reducing temperature is 1000 DEG C to 1200 DEG C and the reducing time is 6 hours to 10 hours; and f, ventilating air to the high-temperature sealed furnace for oxidizing and roasting, wherein the oxidizing and roasting temperature is 900 DEG C to 1100 DEG C and the oxidizing time is 2 hours to 8 hour, and cooling with the furnace to obtaine a sintered brick.

Description

technical field [0001] The present invention relates to a resource utilization method of heavy metal smelting waste slag and urban domestic sludge, in particular to a method for preparing sintered bricks from zinc smelting waste slag and urban domestic sludge. Valuable metals, to achieve the purpose of recycling and harmless treatment of waste residue and sludge. Background technique [0002] A large amount of soil-method zinc smelting residues have accumulated in the northwest of Guizhou, and the existing soil-method zinc smelting residues in Guizhou Province amount to 2.051×10 7 t, covers an area of ​​1068hm 2 . Indigenous zinc smelting waste residues contain toxic heavy metals such as lead, zinc and cadmium, which seriously pollute the nearby soil and river sediments, causing serious damage to the entire ecosystem. Indigenous zinc smelting slag is a kind of pyrometallurgical zinc smelting slag, the main chemical composition is SiO 2 、Al 2 o 3 and Fe 2 o 3 , and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/00
Inventor 胡慧萍邓秋凤李超董泽琴张维
Owner CENT SOUTH UNIV
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