Method for preparing conductive admixture from pyrite smelting slag

A technology for pyrite slag and admixture, which is applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effects of simple preparation process, low cost, and reduced resistivity

Active Publication Date: 2011-01-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Contents of the invention

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of pyrite slag prepares the method for conductive admixture, comprises the steps:

[0032] 1) Raw material pretreatment: Grinding pyrite slag into fine powder to make the particle size ≤0.1mm; coal powder is commercially available powder with particle size ≤0.1mm;

[0033] The industrial analysis of pulverized coal is 19.38% volatile matter, 61.51% fixed carbon, 0.59% moisture, and 18.51% ash; the percentages are mass percentages, the same below;

[0034] The main composition and mass percentage of pyrite slag are: SiO 2 30.47%, Al 2 o 3 25.82%, Fe 2 o 3 28.38%; hereinafter the same;

[0035] 2) Mixing of raw materials: Take the pyrite cinder and coal powder at a mass ratio of 50:10 and mix them in situ, that is, divide the pyrite cinder into 5 equal parts, mix them with coal powder in turn, and stir one part at a time. Minutes, a total of 5 minutes, to make it fully uniform, to get a uniform powder mix;

[0036] 3) Molding: Weigh 8g of each uniformly mixe...

Embodiment 2

[0041] A kind of pyrite slag prepares the method for conductive admixture, comprises the steps:

[0042]1) Raw material pretreatment: Grinding pyrite slag into fine powder to make the particle size ≤0.1mm; coal powder is commercially available powder with particle size ≤0.1mm;

[0043] 2) Mixing of raw materials: Take the pyrite cinder and coal powder at a mass ratio of 50:15 and mix them in situ, that is, divide the pyrite cinder into 5 equal parts, mix them with coal powder in turn, and stir one part at a time. Minutes, a total of 5 minutes, to make it fully uniform, to get a uniform powder mix;

[0044] 3) Molding: Weigh 8g of each uniformly mixed powder, put each portion into a forming mold with a diameter of 25mm, and carry out under the compression test machine at a speed of 200N / S, a target pressure of 40Mpa, and a holding time of 60S Tablet forming to obtain the formed material;

[0045] 4) Roasting: Send the formed material into a high-temperature furnace with a red...

Embodiment 3

[0049] A kind of pyrite slag prepares the method for conductive admixture, comprises the steps:

[0050] 1) Raw material pretreatment: Grinding pyrite slag into fine powder to make the particle size ≤0.1mm; coal powder is commercially available powder with particle size ≤0.1mm;

[0051] 2) Mixing of raw materials: Take the pyrite cinder and coal powder at a mass ratio of 50:20 and mix them in situ, that is, divide the pyrite cinder into 5 equal parts, mix them with coal powder in turn, and stir one part at a time. Minutes, a total of 5 minutes, to make it fully uniform, to get a uniform powder mix;

[0052] 3) Molding: Weigh 8g of each uniformly mixed powder, put each portion into a forming mold with a diameter of 25mm, and carry out under the compression test machine at a speed of 200N / S, a target pressure of 40Mpa, and a holding time of 60S Tablet forming to obtain the formed material;

[0053] 4) Roasting: Send the formed material into a high-temperature furnace with a re...

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Abstract

The invention relates to a method for preparing a conductive admixture from pyrite smelting slag. The method is characterized by comprising the following steps: grinding a raw material ( the pyrite smelting slag) and a reducing agent (pulverized coal) into powder with the grain diameter less than or equal to 0.1mm; weighing and mixing the pyrite smelting slag and the pulverized coal according to the mass ratio of 50:10-25; placing the mixture into a high temperature furnace under the reducing atmosphere, roasting, heating to 600-800 DEG C at the heating rate of 6-8 DEG C/min, and roasting for 60-120min at a constant temperature; cooling the roasted material to room temperature under the reducing atmosphere, taking out and levigating to prepare the conductive admixture finished product; or molding the mixture into pieces or blocks, and then roasting. By adopting the method of the invention, the wastes can be turned into things of value; the cost is low; and the prepared conductive admixture has lower resistivity, can be used for preparing conductive concrete or conductive mortar and also can be used in other building materials.

Description

technical field [0001] The invention belongs to a method for preparing admixtures for construction materials such as mortar, concrete or artificial stone by using waste sintering materials, and relates to a method for preparing conductive admixtures from pyrite slag. The prepared conductive admixture is especially suitable for preparing conductive concrete or conductive mortar, and can also be used in other building materials. Background technique [0002] Pyrite cinder is a waste residue discharged from the process of producing sulfuric acid using pyrite or sulfur-containing tailings as raw materials. my country's sulfuric acid production ranks second in the world, and sulfuric acid produced from pyrite or sulfur-containing tailings accounts for more than 80% of my country's total sulfuric acid production. About 0.7 tons of pyrite slag is discharged for every 1 ton of acid produced. The discharge is quite large. my country discharges millions to tens of millions of tons of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/04
CPCY02W30/91
Inventor 严云黄昱霖胡志华
Owner SOUTHWEAT UNIV OF SCI & TECH
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