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Core-shell structure ceramsite based on iron tailings and alkali slag and its preparation method

A technology of core-shell structure and iron tailings powder, which is applied in the production of clay products, other household utensils, ceramic materials, etc., can solve the problems of environmental damage, destruction of natural mountain landscape and green vegetation, water and soil erosion, etc., to reduce cracking, Suitable for large-scale industrial promotion and the effect of reducing liquid phase viscosity

Active Publication Date: 2022-02-15
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of mountain quarrying has seriously damaged the natural mountain landscape and green vegetation, causing serious consequences such as soil erosion and environmental damage.

Method used

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  • Core-shell structure ceramsite based on iron tailings and alkali slag and its preparation method
  • Core-shell structure ceramsite based on iron tailings and alkali slag and its preparation method
  • Core-shell structure ceramsite based on iron tailings and alkali slag and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of core-shell structure ceramsite based on iron tailings and alkali slag, comprising the following steps:

[0032] 1) Preparation of core raw material pellets: Weigh iron tailings powder, fly ash and alkali slag according to the proportion and mix them evenly to obtain core batch material A. Put core batch material A into the ball forming machine and add water until The water-solid ratio is 0.2, and granulated to obtain core raw meal balls with a particle size of 5mm, wherein the water contains 0.5wt% of the water quality of the water reducing agent, and the iron tailings powder is 70% by mass percentage, and the pulverized coal powder is 70%. Ash is 26%, alkali slag is 4%;

[0033] Preparation of shell batch material B: Weigh iron tailings powder, fly ash and flux in proportion and mix uniformly to obtain shell layer batch material B, wherein, in terms of mass percentage, iron tailings powder is 74%, powder The coal ash is 25%, the flux is 1%, and...

Embodiment 2

[0038] A preparation method of core-shell structure ceramsite based on iron tailings and alkali slag, comprising the following steps:

[0039] 1) Preparation of core raw material pellets: Weigh iron tailings powder, fly ash and alkali slag according to the proportion and mix them evenly to obtain core batch material A. Put core batch material A into the ball forming machine and add water until The water-solid ratio is 0.3, and granulated to obtain core raw meal balls with a particle size of 7mm, wherein the water contains 0.3wt% of the water quality of the water reducing agent, and the iron tailings powder is 70% by mass percentage, and the pulverized coal powder is 70%. Ash is 24%, alkali slag is 6%;

[0040] Preparation of shell batch B: Weigh iron tailings powder, fly ash and flux in proportion and mix them uniformly to obtain shell batch B, wherein, in terms of mass percentage, iron tailings powder is 73%, powder The coal ash is 24%, the flux is 3%, and the flux is gypsum...

Embodiment 3

[0045] A preparation method of core-shell structure ceramsite based on iron tailings and alkali slag, comprising the following steps:

[0046] 1) Preparation of core raw material pellets: Weigh iron tailings powder, fly ash and alkali slag according to the proportion and mix them evenly to obtain core batch material A. Put core batch material A into the ball forming machine and add water until The water-solid ratio is 0.3, and granulated to obtain core raw meal balls with a particle size of 10mm, wherein the water contains 0.2wt% of the water quality of the water reducing agent, and the iron tailings powder is 68% in terms of mass percentage, and the pulverized coal is 68%. Ash is 24%, alkali slag is 8%;

[0047] Preparation of shell batch material B: Weigh iron tailings powder, fly ash and flux in proportion and mix uniformly to obtain shell layer batch material B, wherein, in terms of mass percentage, iron tailings powder is 72%, powder The coal ash is 23%, the flux is 5%, ...

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Abstract

The invention discloses a preparation method of core-shell structure ceramsite based on iron tailings and alkali slag, which comprises the following steps: weighing iron tailings powder, fly ash and alkali slag according to the proportion and mixing them uniformly to obtain the core Batch material A, put the core batch material A into the ball machine and add water to get the core raw meal ball; weigh the iron tailings powder, fly ash and flux in proportion and mix them evenly to get the shell layer batch material B; Put the core raw meal balls into the shell batch material B and roll to obtain the ceramsite raw meal balls; raise the obtained ceramsite raw meal balls from room temperature to 1100~1260°C and keep it warm for 30~100min, then cool naturally to At room temperature, the core-shell structure ceramsite was obtained. The present invention mainly provides Al from fly ash 2 o 3 and SiO 2 composition, iron tailings provide SiO 2 Composition, the alkali metal ions in the alkali slag can reduce the firing temperature of the core, reduce the viscosity of the liquid phase, increase the production of mullite, kyanite, anorthite and glass phases during the calcination process, and increase the ceramsite core. Part of the mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of preparing building materials through comprehensive utilization of solid waste, and in particular relates to a core-shell structure ceramsite based on iron tailings and alkali slag and a preparation method thereof. Background technique [0002] Alkali slag is a kind of industrial waste discharged in the process of making alkali by ammonia-soda method, and its chemical composition is CaCO 3 Mainly, for every 1 ton of soda ash produced in the current ammonia-soda process, 1 ton of solid alkali slag with a water content of about 60% will be discharged. If such a large-scale alkali slag resource is not comprehensively utilized, it will have extremely significant negative impacts on the environment, economy and society. At present, a lot of research work has been carried out on the use of alkali slag to prepare building materials such as cement, engineering soil, and alkali slag bricks. However, due to the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/135C04B33/132C04B33/13
CPCC04B33/1352C04B33/1324C04B33/132C04B33/1328C04B33/131C04B2235/445C04B2235/448C04B2235/3409C04B2235/96C04B2235/77C04B2235/3463C04B2235/3454Y02P40/60
Inventor 胡晨光王娟贾援白瑞英刘刚安宇坤封孝信
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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