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Method for preparing bricks from heavy metal sludge by using wet method

A heavy metal sludge and heavy metal technology, applied in clay products, applications, household appliances, etc., to avoid energy consumption, realize safe resource utilization, and achieve multi-win effects of ecological and environmental benefits

Active Publication Date: 2020-03-24
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at how to deal with the secondary pollution caused by heavy metal sludge to the ecological environment and the problem of resource utilization, the present invention proposes a method for making bricks from heavy metal sludge by wet method

Method used

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  • Method for preparing bricks from heavy metal sludge by using wet method
  • Method for preparing bricks from heavy metal sludge by using wet method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Raw materials: sewage treatment plant sludge, with a moisture content of 90%; clay with a moisture content of 8%.

[0021] 2. Process steps

[0022] figure 1 It is the process flow of the method for making heavy metal sludge wet bricks.

[0023] 1) Material formula (mass percentage): Control the dosage of domestic sludge at 70%, and the dosage of clay at 30%.

[0024] 2) Mixing: Put the mixture in a planetary mixer and adjust the mixing time appropriately.

[0025] 3) Aging: Place the material in a natural ventilated place for aging for 5 days, mechanically turning 4 times during aging, and the moisture content of the mixture after aging is 20%.

[0026] 4) Press molding: Put the aged material into the mold, and press it into molding with a molding pressure of 10MPa.

[0027] 5) Drying of the bricks: Put the bricks in the room temperature and dry in the shade for 4 days, and then dry them at 105°C for 24 hours.

[0028] 6) High-temperature roasting: Raise from room temperature to...

Embodiment 2

[0034] 1. Raw materials: sludge from domestic sewage treatment plant, with a moisture content of 50%; clay with a moisture content of 10%.

[0035] 2. Process steps

[0036] 1) Material formula (mass percentage): control the domestic sludge content to 10% and clay content to 90%.

[0037] 2) Mixing: Put the mixture in a planetary mixer and adjust the mixing time appropriately.

[0038] 3) Aging: The material is aged in a natural ventilated place for 2 days. During the aging period, it is mechanically turned 3 times. The moisture content of the aging mixture is 18%.

[0039] 4) Press molding: Put the aged material into the mold, and press it into molding with a molding pressure of 10MPa.

[0040] 5) Drying of the bricks: Put the bricks in the room temperature and dry in the shade for 4 days, and then dry them at 105°C for 24 hours.

[0041] 6) High-temperature roasting: Raise from room temperature to 200°C and stay at 200°C for 1h; then heat up from 200°C to 600°C and stay at 600°C for 1.5...

Embodiment 3

[0047] 1. Raw materials

[0048] 1) Heavy metal sludge: 70% moisture content

[0049] 2) Clay: 9% moisture content

[0050] Table 1 below shows the heavy metal element content (unit: mg / kg) in the heavy metal sludge and clay in this case.

[0051] Table 1 Heavy metal content in heavy metal sludge and clay (unit: mg / kg)

[0052] projectCu Zn Ni CdCr Pb Heavy metal sludge9749.84813.231643.39169.3624770.30742.18 clay36.5988.6215.520.4175.8516.71

[0053] 2. Process steps

[0054] 1) Material formula (mass percentage): Control the mixing amount of heavy metal sludge to 40%, and the mixing amount of clay to 60%.

[0055] 2) Mixing: Put the mixture in a planetary mixer and adjust the mixing time appropriately.

[0056] 3) Aging: Place the material in a natural ventilated place for 4 days, mechanically turning 4 times during the aging, and the moisture content of the mixture after aging is 19%.

[0057] 4) Press molding: Put the aged material into the mold, and press it into molding with a m...

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Abstract

The invention discloses a method for preparing bricks from heavy metal sludge by using a wet method. The bricks are prepared by using 10-70% of heavy metal sludge with a water content of 50-90% and 30-90% of brick making clay with a water content of 8-10% according to the following method: 1) mixing the heavy metal sludge and the clay, and uniformly stirring; 2) aging the materials for 2-5 days toenable the total water content of the material to be 17-21%; 3) carrying out pressing molding on the aged material under a molding pressure of 7-15 MPa; 4) naturally drying the press-molded brick billet at a room temperature for 4 days, and then drying at about 100 DEG C for 24 hours; 5) raising the temperature from a room temperature to 1000 DEG C, and keeping the temperature for 2 hours, and 6)naturally cooling to a room temperature to obtain the brick. According to the invention, the detection results show that various indexes of the prepared finished brick meet or exceed related nationalstandards, and the results of the simulated acid rain leaching test show that the heavy metals in the sintered brick block are completely solidified and cannot cause secondary environmental pollutioncaused by dissolving out.

Description

Technical field [0001] The invention belongs to the field of hazardous solid waste treatment and resource utilization, and relates to heavy metal sludge utilization technology, in particular to a method for making heavy metal sludge wet bricks. Background technique [0002] Heavy metal sludge is a by-product in the treatment of industrial wastewater. Due to the high content of heavy metals, it has extremely serious pollution to the ecological environment. The traditional landfill treatment of sludge not only takes up valuable land resources, but also is difficult to completely prevent the secondary pollution of heavy metals. Secondary pollution. Therefore, it is necessary to develop a heavy metal sludge treatment technology that is safe and recyclable. [0003] For a long time, our country has usually used clay to sinter building materials to invade and destroy farmland, resulting in a series of ecological and environmental problems such as soil fertility decline and soil erosion....

Claims

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Application Information

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IPC IPC(8): C04B33/138C04B33/04
CPCC04B33/138C04B33/04C04B2235/6562C04B2235/6567C04B2235/661Y02P40/60
Inventor 呼世斌高德明
Owner NORTHWEST A & F UNIV
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