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Method for preparing foamed ceramic from slag

A foamed ceramic and slag technology, which is used in ceramic products, ceramic material production, clay products and other directions, can solve the problems of complex and diverse batching procedures, difficult technological processes, low reproducibility, etc., and achieves low molding process costs and wide sources. , the effect of low manufacturing cost

Inactive Publication Date: 2014-12-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although some of the existing methods for preparing foamed ceramics use wastes such as chromium slag and coal gangue, there is no use of nickel smelting water-quenched slag as a raw material for foamed ceramics, and foamed ceramics prepared without templates require Adding a variety of auxiliary materials such as foaming agents and additives has the disadvantages of many types of raw materials and auxiliary materials, complex and diverse batching procedures, difficult process and low recurrence rate.

Method used

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  • Method for preparing foamed ceramic from slag
  • Method for preparing foamed ceramic from slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Prepare the batch according to the formula of 13.5 g of slag, 13.7 g of kaolin, and 2.9 g of alumina powder, weigh the raw materials respectively, put them into an agate mortar and grind and mix for 5 minutes to make a foam ceramic batch.

[0028] 2) Spread the mixed batch material into an alumina crucible with a diameter of 30mm, put it into a sintering furnace, raise the temperature to 1100°C at a heating rate of 160°C / h, and then raise the temperature to 1300°C at a heating rate of 60°C / h ℃, and then keep it at 1300 ℃ for 2 hours to obtain foamed ceramics with a cell diameter of 0.5-3mm.

[0029] 3), the ceramic foam obtained by this method is uniform beige white, the overall color is uniform and beautiful, and the main phase is mullite.

Embodiment 2

[0031] 1) Prepare batch materials according to the formula of 13.2 grams of slag, 12.5 grams of kaolin, and 2.6 grams of alumina powder. Weigh the raw materials respectively, put them into an agate mortar and grind and mix for 5 minutes, add water to make mud, and can be molded into the desired shape. shape, dried into a green body.

[0032] 2) Put the prepared green body into the sintering furnace, raise the temperature to 1100°C at a heating rate of 150°C / h, then raise the temperature to 1350°C at a heating rate of 40°C / h, and then keep it at 1350°C for 2 hours. A ceramic foam with a bubble diameter of 3-5 mm can be obtained.

[0033] 3), the surface of the ceramic foam obtained by this method is light green, the pore size range is narrow, the pore distribution is more uniform, the main phase is mullite, and the compressive strength is higher than that of the sample in Example 1.

Embodiment 3

[0035] 1) Prepare the batch according to the formula of 13.0 g of slag, 10.4 g of kaolin, and 5.6 g of alumina powder, weigh the raw materials respectively, put them into an agate mortar and grind and mix for 5 minutes to make a foam ceramic batch.

[0036] 2) Spread the mixed batch material into an alumina crucible with a diameter of 30mm, put it into a sintering furnace, raise the temperature to 1100°C at a heating rate of 180°C / h, and then raise the temperature to 1450°C at a heating rate of 60°C / h ℃, and then keep it at 1450℃ for 1 hour to obtain foam ceramics with a bubble diameter of 3-8mm.

[0037] 3), the ceramic foam obtained by this method is uniform light green, slightly transparent, relatively high in hardness, slightly poor in pore distribution uniformity, and the main phase is mullite.

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Abstract

The invention discloses a method for preparing foamed ceramic from slag. The method comprises the following steps: by selecting nickel-smelting water-quenching slag (short for slag) discharged after refining ferronickel from laterite-nickel ore as a main raw material, adding a proper amount of kaolin and alumina powder; and preparing the foamed ceramic according to the following technological processes: sorting the nickel-smelting water-quenching slag; crushing; screening; weighing; adding the kaolin; adding the alumina powder; mixing the materials; molding; and sintering. The method is characterized in that the discharged quenched slag for smelting nickel after refining ferronickel by the laterite-nickel ore is selected as the main raw material, no foaming agent or template is utilized, holes which are even in distribution and controllable in size are formed in a sintering body by virtue of chemical reaction of the slag, the kaolin and the alumina powder at high temperature, and the foamed ceramic of mullite is finally prepared. The foamed ceramic has the advantages of high compressive strength, high hardness, uniform and beautiful color and low cost and is simple and convenient in pore size control, the slag is fully utilized, and the waste materials are changed into things of value.

Description

technical field [0001] The invention belongs to the field of preparation of foamed ceramic materials, and relates to a method for preparing porous foamed ceramics by using industrial waste nickel smelting water-quenched slag (hereinafter referred to as slag). Background technique [0002] Nickel is an important metal element. The output of nickel-smelting water-quenching slag discharged after extracting ferronickel from laterite nickel ore is large. The slag contains a large amount of silicon, magnesium, and calcium elements, and also contains a small amount of heavy metals such as ferronickel Impurities, at present, the comprehensive utilization of slag is still very little, most of them are directly stacked or used as paving materials, there are potential environmental hazards, and the value of slag has not been reflected. [0003] The slag contains many useful elements, and the use of slag to prepare foamed ceramics not only solidifies the harmful elements in it, but also...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B33/132
CPCY02P40/60
Inventor 张雯郝秋艳齐瑶瑶
Owner HEBEI UNIV OF TECH
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