Ecological block prepared by riverway silt, and method and device for preparing ecological block

Abstract

The invention relates to an ecological block prepared by riverway silt, and a method and device for preparing the ecological block. The method comprises the following steps that S1, waste in the original riverway silt is removed, sand stone is separated from the original riverway silt, and the riverway silt after pretreatment is obtained; and an accessory ingredient is added into the riverway siltafter pretreatment for passivation regulating to obtain the riverway silt after passivation, and the accessory ingredient comprises calcium oxide, iron salt, polyacrylamide and bentonite; S2, dewatering is conducted on the riverway silt after passivation to obtain a silt cake, and crushing is conducted on the silt cake to obtain scattered base mud with the particle size of no more than 1mm; and S3, the scattered base mud, cement, coarse aggregates and fine aggregates are mixed and pressed and molded for still standing to obtain the ecological block. The device for preparing the ecological block by the riverway silt comprises a cutter-suction dredger, a sand stone separating machine, a silt concentrator, a silt dewatering machine, a silt crusher and a brick press. According to the ecological block, passivation is conducted on the heavy metal ions, and the environmental protection performance and the anti-pressure performance are excellent.

Description

technical field [0001] The disclosure relates to ecological bricklaying technology, in particular to an ecological block prepared from river mud and its method and device. Background technique [0002] River silt is one of the solid wastes generated during the comprehensive improvement of urban rivers. There are many urban rivers in my country. With the implementation of the national river chief system and the implementation of the system of one river, one policy, dredging and dredging of rivers will inevitably produce a large amount of silt. It is extremely difficult to dispose of urban silt nowadays. Most of the urban river silt is disposed of by landfill, which takes up landfill space and has hidden dangers of secondary pollution. How to effectively dispose and utilize river silt as a resource is of great significance to solve the outlet for river silt and build a resource-saving and environment-friendly beautiful China. [0003] At home and abroad, a lot of research and...

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Problems solved by technology

Existing invention patents and research documents have proposed the use of river silt to produce sintered bricks, composite solidified materials, and unfired bricks, such as patent numbers CN101475397A, CN103086666A, etc., but there are still some shortcomings. One is the amount of solid waste added in the brick raw materials It is relatively low, and it is impossible to realize a large amount of waste disposal; second, the performance of silt bricks is not good, and the scope of application is limited; third, the product still lacks environmental safety evaluation, and the public acceptance of it is not high

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