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Red mud steaming and pressurizing product and preparation method thereof

A technology of red mud and products, which is applied in the field of red mud autoclaved products and its preparation, can solve the problems of limited comprehensive utilization, red mud containing alkali, etc., and achieve good physical and mechanical properties and durability, strong structure and compactness Effect

Inactive Publication Date: 2010-01-20
李为成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a red mud autoclaved product and a preparation method of the product to solve the problem of limited comprehensive utilization of the red mud containing alkali

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The present invention firstly provides a method for preparing a red mud autoclaved product, comprising the following steps:

[0015] Step S1, premixing the raw materials mainly composed of low-temperature ceramic cement materials, red mud and fly ash industrial waste residues to form chemically bonded ceramic bodies with silicon-aluminum long chains as the main structure, calcium silicate hydrate and ettringite crystals .

[0016] In the premixing process, because the main structure of the low-temperature ceramic cementitious material, the silicon-oxygen tetrahedron is electrically neutral, and the aluminum-oxygen tetrahedron is electronegativity, which can absorb alkali metal ions in the red mud to balance the charge, so that the low-temperature ceramic The active ions in the gelling material exchange with the free and dissolved alkali metal ions in the red mud, so that all the alkali in the red mud is released during the reaction cycle, and the released alkali promote...

Embodiment 1

[0022] Red mud 75%, fly ash 10%, desulfurized gypsum 3%, phosphorus slag 3%, hydrochloric acid 1%, 401 glue and / or 107 glue 1%, separating agent.

Embodiment 2

[0024] Red mud 90%, fly ash 5%, phosphorus slag 3%, hydrochloric acid 1%, 401 glue and / or 107 glue 1%.

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Abstract

The invention discloses a red mud steaming and pressurizing product and a preparation method thereof, which aim to solve the problem of comprehensive utilization limitation caused by alkali-contained red mud. The preparation method of the red mud steaming and pressurizing product comprises the following steps: premixing a raw material mainly comprising a low-temperature ceramic plaster material and red mud and pulverized fuel ash industrial waste residues to form a chemical bonding ceramic body, tobermorite and an ettringite crystal which adopt a silicon-aluminum long chains as a main structure; forcibly pugging the premixed product, carrying out secondary crushing dispersion and charging the premixed product into a vibration molding machine to mold; procuring a molded blank for a period of time and placing the blank into a steaming and pressurizing kettle to steam and pressurize so as to prepare the red mud steaming and pressurizing product. The product prepared by the method mainly comprises the chemical bonding ceramic body, the tobermorite and the ettringite crystal which adopt the silicon-aluminum long chain as the main structure and is divided into an inner layer and an outer layer, wherein an inner hollow cavity is formed between the inner layer and the outer layer; and the heavy metal and a radioactive substance in the red mud are partitioned and surrounded in the inner layer by the inner hollow cavity.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a red mud autoclaved product and a preparation method thereof. Background technique [0002] Red mud is the solid waste discharged during the alumina production process. It is called red mud because of its high iron oxide content, and it can be used as a raw material for ironmaking. [0003] At present, red mud is mainly stored by dam-building wet method, separated by natural settlement, and the alkali-containing waste liquid is returned for reuse. However, this method is easy to cause soil alkalization and swamping through alkali solution infiltration, and pollute surface and groundwater sources. [0004] On the other hand, the comprehensive utilization of raw materials such as red mud and powdered coal to produce autoclaved bricks is a main direction of red mud utilization. However, since red mud contains two types of alkali, free and dissolved, the main form of f...

Claims

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Application Information

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IPC IPC(8): B28B1/08B28C1/16B28C1/18B28B11/24B28C7/04
CPCC04B28/065C04B28/184Y02W30/91C04B18/0409C04B18/08C04B18/165C04B38/08C04B40/0067C04B40/024
Inventor 李为成
Owner 李为成
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