Foamed ceramic prepared from gold tailings and coal gangue and preparation method

A technology of foamed ceramics and coal gangue, which is applied in the field of building materials, can solve the problems of low utilization of gold tailings and coal gangue, complex preparation processes, etc., and achieve the effects of improving physical and chemical properties, simple process, and low production cost

Pending Publication Date: 2021-09-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization of gold tailings and coal gangue described in this method is less, and the preparation process is complicated

Method used

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  • Foamed ceramic prepared from gold tailings and coal gangue and preparation method
  • Foamed ceramic prepared from gold tailings and coal gangue and preparation method
  • Foamed ceramic prepared from gold tailings and coal gangue and preparation method

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preparation example Construction

[0032] The present invention also provides a method for preparing foamed ceramics prepared from gold tailings and coal gangue, comprising the following steps:

[0033] (1) After weighing gold tailings, microsilica fume, coal gangue, albite, silicon carbide micropowder, talc, and calcite in proportion, carry out ball milling and mix;

[0034] (2) Put the mixed powder into the mould, pave and compact it to obtain a green body;

[0035] (3) After the green body is preheated, foamed, stabilized, and annealed, foamed ceramics are obtained.

[0036] Preferably, the preheating stage of step (3) is: put the green body into a high-temperature furnace, raise the temperature from room temperature to 400-600°C at a heating rate of 10-15°C / min, and keep it warm for 30-90min; The rate is 12-13°C / min, the temperature is raised to 480-520°C, and the holding time is 50-70min.

[0037] Preferably, the foaming stage of step (3) is: after the preheating is completed, the temperature is raised t...

Embodiment 1

[0045] The present embodiment utilizes the preparation method of the foamed ceramics prepared by gold tailings and coal gangue, comprising the following steps:

[0046] (1) Take by weight 45 parts of gold tailings, 25 parts of coal gangue, 2 parts of microsilica fume, 4.8 parts of albite, 0.2 part of silicon carbide micropowder, 2 parts of talc, and 2 parts of calcite, mix and put Put into ball mill for 0.5h, pass through 180 mesh sieve after ball milling;

[0047] (2) Putting the mixed powder into the mold to pave and compact to obtain a green body, wherein the green body accounts for 40% of the mold volume;

[0048] (3) Put the green body into the high-temperature furnace for preheating, and raise the temperature from room temperature to 400°C at a heating rate of 10°C / min, and keep it warm for 30 minutes; after the preheating is completed, raise the temperature to 1150°C at a heating rate of 2°C / min , keep warm for 30 minutes, and start foaming; after the foaming is complete...

Embodiment 2

[0050] The present embodiment utilizes the preparation method of the foamed ceramics prepared by gold tailings and coal gangue, comprising the following steps:

[0051] (1) Take by weight 52 parts of gold tailings, 30 parts of coal gangue, 5 parts of microsilica fume, 6 parts of albite feldspar, 0.3 part of silicon carbide micropowder, 3 parts of talc, 4 parts of calcite, mix, put Enter the ball mill for 1 hour, and pass through a 200-mesh sieve after ball milling;

[0052] (2) put the mixed powder into the mold to pave and compact to obtain a green body, wherein the green body accounts for 46% of the mold volume;

[0053] (3) Put the green body into a high-temperature furnace for preheating, and raise the temperature from room temperature to 520°C at a heating rate of 12°C / min, and keep it for 60 minutes; after the preheating is completed, raise the temperature to 1170°C at a heating rate of 3°C / min , keep warm for 60 minutes, and start foaming; after the foaming is complete...

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Abstract

The invention relates to the technical field of building materials, in particular to foamed ceramic prepared from gold tailings and coal gangue and a preparation method. The preparation method comprises the following steps of: by taking gold tailings and coal gangue as main raw materials and micro silicon powder, albite, silicon carbide micro powder, talc and calcite as auxiliary materials, carrying out ball milling, sieving and sintering to prepare the foamed ceramic with the average foam diameter of 1-3mm, the density of 350-600kg / m < 3 >, the compressive strength of 4.7-7.6 MPa and the heat conductivity coefficient of 0.049-0.062 W / (m.k). According to the invention, different wastes are compounded for use, and the synergistic and complementary effects among solid waste components are utilized, so that the foamed ceramic with excellent performance is prepared, and bulk utilization of solid wastes is realized.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a foamed ceramic prepared by utilizing gold tailings and coal gangue and a preparation method thereof. Background technique [0002] Coal gangue is produced in the process of coal production and washing. According to statistics, the existing stockpile of coal gangue in my country is more than 5 billion tons, and the annual discharge is about 750 million tons. At the same time, since coal gangue contains combustible substances such as carbonaceous mudstone and pyrite, long-term open-air storage may easily lead to spontaneous combustion of gangue, which in turn emits harmful gases and pollutes the surrounding environment. [0003] Gold tailings are waste residues produced after crushing and flotation of gold-bearing ores. In 2013, the production of gold tailings in China reached 214 million tons of gold tailings. However, the comprehensive utilization rate of tailings is...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B33/132C04B33/138
CPCC04B38/0025C04B33/132C04B33/138C04B2235/77C04B2235/96Y02P40/60
Inventor 邱景平孙晓刚马征宇王海龙邢军程春宏赵家琪闫雨辰赵兴东
Owner NORTHEASTERN UNIV
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