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A method for making bricks without sintering by using dredged bottom mud

A technology for dredging sediment without sintering, applied in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of high energy consumption of organic pollutants, secondary pollution, etc., to overcome high energy consumption, easy large-scale production, material easy-to-get effect

Inactive Publication Date: 2016-02-10
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention effectively overcomes the disadvantages of high energy consumption, migration and transformation of organic pollutants, and secondary pollution caused by the sintering brick making method in the prior art

Method used

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  • A method for making bricks without sintering by using dredged bottom mud
  • A method for making bricks without sintering by using dredged bottom mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Collect the bottom mud generated by dredging in waterways, ditches, (along the river / sea) ports, docks, etc. After standing, aging, decontamination, sterilization and disinfection, add 15% effective concentration of 2,4 to the bottom mud. ,6-trimercapto-1,3,5-triazine trisodium salt (TMT-15) solution, the addition amount is 5% of the dry bottom mud mass. Mechanically stir for more than 5 minutes until the mixture is uniform. After weathering, exposure and other treatments, the moisture content of the sediment is controlled to be 1%-5%. If the moisture content exceeds 5%, it needs to be dried in time. After crushing, ball milling and sorting by pulverizer, ball mill and screen, select 100-150 mesh sediment particles for use.

[0030] Mix air-dried bottom mud, P.O42.5 cement, clinoptilolite powder and quicklime in a mass ratio of 100:45:10:1.5, and add water to adjust the water-cement mass ratio to 35-45%. Stir mechanically at room temperature, first at slow speed for 3...

Embodiment 2

[0045] The specific preparation steps are the same as those in Example 1.

[0046] Add heavy metal collector 2,4,6-trimercapto-1,3,5-triazine trisodium salt to dredged sediment, according to the ratio of dry sediment, 425# ordinary Portland cement, zeolite and quicklime to 100:45 : The mass ratio of 10:1.5 is mixed evenly, molded into molding, demoulded after curing for 1 day, and wet curing for 7-90 days. The size of the sinter-free brick is 240mm×115mm×53mm.

[0047] The mechanical properties test: 7-day average compressive strength: 4.3MPa, flexural strength: 1.0MPa; 28-day average compressive strength is 10.2MPa, flexural strength 2.1Mpa, in line with NYT671-2003 "Concrete Ordinary Bricks and Decorative Bricks" "Standard of load-bearing MU10 and non-load-bearing MU7.5 in the standard; 90-day average compressive strength is 15.6MPa, and flexural strength is 2.9MPa, reaching the load-bearing MU15 and non-load-bearing MU7 in NYT671-2003 "Concrete Ordinary Bricks and Decorati...

Embodiment 3

[0052] The specific preparation steps are the same as those in Example 1.

[0053] Add dredged sediment to TMT-15, dry sediment, 425-type cement, zeolite, and quicklime are mixed uniformly according to the mass ratio of 100:45:10:1.5, and mold is formed. After curing for 1 day, the mold is released, and wet curing is performed for 7-90 days. . The size of the sinter-free brick is 240mm×115mm×53mm. The 28-day average compressive strength after the mechanical property test meets the standard of load-bearing MU10 and non-load-bearing MU7.5 in NYT671-2003 "Concrete Ordinary Bricks and Decorative Bricks"; the 90-day average compressive strength reaches load-bearing MU15 and non-load-bearing MU7.5 It also meets the GB / T24493-2009 "Decorative Concrete Bricks" MU15 standard value. According to HJ / T299-2007 "Solid Waste Leaching Toxicity Leaching Method Sulfuric and Nitric Acid Method", the leaching concentration of Pb in the sediment is 0.006mg / L, Cd cannot be detected, the leaching...

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Abstract

The invention relates to a sintering-free method for preparing bricks from dredged sediment, which comprises the following steps: collecting the dredged sediment and abandoning the overlaying water; uniformly spraying 2,4,6-trithione-1,3,5-triazine trisodium salt to the dredged sediment, stirring quickly, crushing and grinding the dredged sediment with a pulverizer after naturally airing; screening the sediment with a sieve of 100-150 meshes and then mixing with P.O42.5 cement, natural zeolite and quicklime with the mass ratio of (90-110): (40-60): (5-20): (0.5-5); controlling the water cement mass ratio to be 35-45% at room temperature; pouring into a standard mold and conducting wet curing for 24-48 hours; and then demolding and continuing the curing for 7-90 days to obtain the non-sintered brick. The method provided by the invention has advantages such as simple process, energy conservation, environmental protection, low leachability of heavy metals, high compression strength, high porosity and good adsorption. The non-sintered brick can be used as building materials, and also can adsorb and stabilize heavy metals and organic substances in water.

Description

technical field [0001] The invention relates to a method for making bricks by using dredged sediment without sintering, which is for resource utilization of heavy metals in the dredged sediment and the effectively stabilized sediment. Background technique [0002] Sewage discharge and atmospheric deposition bring many pollutants into the water body, and the pollutants are enriched in the water body sediment through physical, chemical and biological effects, resulting in serious pollution of nitrogen, phosphorus, nutrients and heavy metals in the river sediment. In my country, the Dianchi Lake Caohai Polluted Sediment Dredging and Disposal Project (Phase I), which was implemented from 1998 to 1999, was the first large-scale lake environmental dredging project in my country, removing nearly 4 million m of sediment. 3 . Subsequently, environmental protection dredging projects were also carried out in Taihu Lake, Xingyun Lake, Chaohu Lake and Nanhu (Changchun City). In March 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C02F11/14
Inventor 宋迪陶红宗蕊董继锋孙洪春庞涛戴博林陈良霞宋晓锋
Owner UNIV OF SHANGHAI FOR SCI & TECH
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