METHOD FOR PREPARING BUILDING MATERIALS FROM SLUDGE CONTAINING EXCESSIVE HEAVY METALS BY USING TRIPLE SOLIDIFICATION TECHNIQUE

WIPO Patent Application WO/2022/143706

A1

A method for preparing building materials from sludge containing excessive heavy metals by using a triple solidification technique, comprising material selection, preparation of modified sludge, high temperature treatment, oscillation mixing, preparation of modified slag, and mixing and forming of raw materials, wherein the raw materials comprise sludge, iron ore slag, lightweight aggregate, coal ash, a sludge solidified agent, cement and sand. The heavy metals in the sludge are passivated by means of the solidified agent to achieve first layer sealing, then dust and the internal heavy metals penetrate into pores of the lightweight aggregate for secondary sealing through the action of a high-frequency oscillator, and finally the treated lightweight aggregate is mixed with cement, sand and the like for third sealing, so that triple solidification of the heavy metals is achieved, the harm of the heavy metals is reduced, such waste from sludge and industrial tailings is rationally reused, the space occupied by the sludge and industrial tailings is saved, the influence of the waste such as sludge and industrial tailings on the environment is reduced, and a lot of resources are saved.

LIU ZHIHAO (CN)

PCT/CN2021/142244

July 07, 2022

December 29, 2021

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HUBEI JUHAI ENVIRONMENTAL TECH CO LTD (CN)

C04B18/04; C04B28/00; C04B20/02; C04B20/04; C04B40/00

CN112759305A	2021-05-07
CN103145442A	2013-06-12
CN108117350A	2018-06-05
CN103862576A	2014-06-18
CN102173850A	2011-09-07
CN105130397A	2015-12-09
CN111943715A	2020-11-17
US20100186635A1	2010-07-29
US5358760A	1994-10-25

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