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A method of using solid waste to prepare lightweight thermal insulation wall material

A technology for solid waste and thermal insulation walls is applied in the field of waste resource utilization, which can solve the problems of high cost and poor performance, and achieve the effects of reducing power consumption of grinding, reducing product cost and being beneficial to environmental protection.

Active Publication Date: 2019-05-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method that fully uses solid waste (mainly copper tailings, gold tailings and chrome slag) to prepare performance, low-cost light-weight insulation firewall body material, to solve the problem of current inorganic fireproof insulation materials. The current situation of high cost and poor performance, and alleviate the current situation of environmental pollution caused by various solid waste stockpiles

Method used

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  • A method of using solid waste to prepare lightweight thermal insulation wall material
  • A method of using solid waste to prepare lightweight thermal insulation wall material
  • A method of using solid waste to prepare lightweight thermal insulation wall material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw materials used to prepare the dry basis are according to mass percentage: 53.3% of copper tailings, 5% of gold tailings, and 41.7% of chromium slag, and the raw materials are dried until the moisture content is lower than 2wt%. The addition amount of the composite expansion agent is 0.25% of the dry basis mass, the addition amount of the composite dispersant is 0.15% of the dry basis mass, and each raw material is accurately weighed. The weighed raw materials are placed in a ceramic ball mill, the material-to-ball ratio of the ball mill is 1:4, the mixture is mixed for 4 hours, and the particle size of the mill is <75um.

[0038] Put the prepared powder into a refractory mold covered with high-temperature paper, the thickness of the pavement is 60mm, put the mold with powder on the kiln car, and heat up to 1190°C at a heating rate of 5°C / min in the tunnel kiln , after heat preservation for 1h 20min, cool in the kiln at 8°C / min to 850min, then cool at 0.5°C / min t...

Embodiment 2

[0043] The mass percentages of raw materials used for preparing the dry basis are: 65.2% of copper tailings, 4.5% of gold tailings, and 30.3% of chrome slag, and the raw materials are dried to a moisture content of <2%. The addition amount of the composite expansion agent is 0.30wt%, the addition amount of the composite dispersant is 0.3% of the dry weight, and each raw material is accurately weighed. The temperature was raised to 1180° C. at a heating rate of 6° C. / min, and kept for 1 h 20 min. The rest of the steps were the same as in Example 1. The performance data of the prepared foam ceramic light-weight thermal insulation material are shown in Table 2 below:

[0044] Table 2 Properties of Foam Ceramic Lightweight Thermal Insulation Material

[0045]

Embodiment 3

[0047] The mass percentage of raw materials used for preparing the dry basis: 70.5% of copper tailings, 8.5% of gold tailings, and 21% of chromium slag, and the raw materials are dried to a moisture content of <2%. The addition amount of the composite expansion agent is 0.40wt%, the addition amount of the composite dispersant is 0.5% of the dry weight, and each raw material is accurately weighed. The temperature was raised to 1160° C. at a heating rate of 5° C. / min, and kept for 1.5 hours. The rest of the steps were the same as in Example 1. The performance data of the prepared foam ceramic light-weight thermal insulation material are shown in Table 3 below:

[0048] Table 3 Properties of Foam Ceramic Lightweight Thermal Insulation Material

[0049]

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Abstract

The invention discloses a method for utilizing solid waste for preparing a light-weight heat-insulating wall material. The method comprises the steps of drying copper tailings, gold tailings and chromite residues in a blast air oven at the temperature ranged from 105 to 110 DEG C until the moisture content is lower than 1.0 percent, and then using steel balls for grinding powder and the chromite residues until all material can be sieved through a 150mum standard sieve; mixing the copper tailings, the gold tailings, the chromite residues, a compound expanding agent and a compound dispersant agent, powder grinding for 2 to 10h, and obtaining billets through sieving all ground billets through a 250-mesh standard sieve; filling billet powder into a mould assembled by refractory slabs through a natural stacking way, and isolating the billets and the refractory slabs through ceramic fiber paper; putting the mould into a kiln, raising the temperature to be ranged from 1080 DEG C to 1200 DEG C, and sintering, wherein the temperature raising rate is ranged from 3 to 8 DEG C / min, and the heat preservation time is ranged from 0.5 to 2h; and cooling in the kiln to obtain the light-weight heat-insulating wall material, wherein the cooling rate is ranged from 0.5 to 4 DEG C / min, and the cooling time is ranged from 6h to 15h.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste, and in particular relates to a method for preparing light-weight thermal insulation wall materials by using solid waste. Background technique [0002] Copper tailings and gold tailings are solid wastes from the purification of metals, mainly containing SiO 2 、Al 2 o 3 , alkali metal and alkaline earth metal oxides, accompanied by a large amount of heavy metal elements and sulfide and other harmful substances, the particle size is small, and the bulk density is high. Chromium slag is the waste discharged from the smelting of metal chromium, the main component is SiO 2 、Al 2 o 3 、Cr 2 o 3 , MgO, and contains a small amount of highly toxic element Cr 6+ . The open-air storage of these solid wastes not only occupies a large amount of land, but also causes soil and groundwater pollution due to the dissolution of heavy metal elements. The particles mixed with the wind into the atmo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B33/138C04B33/132C04B33/13
CPCC04B33/1305C04B33/131C04B33/132C04B33/1328C04B33/138C04B38/02C04B2235/3826C04B2235/442C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B38/0067C04B38/0074Y02P40/60
Inventor 周明凯葛雪祥王怀德
Owner WUHAN UNIV OF TECH
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