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Method for treating arsenic-containing waste residues by using cement rotary kiln

A cement rotary kiln and waste slag technology is applied in the fields of harmless arsenic-containing waste slag, disposal of arsenic-containing waste slag, and resource utilization. Secondary pollution, health protection, and the effect of reducing environmental pollution

Active Publication Date: 2014-04-30
云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The energy consumption is large. Since the volatilization temperature of arsenic is 600-800°C, it is necessary to add fuel to realize the volatilization of arsenic and achieve the purpose of harmless disposal of arsenic-containing waste residue, so the energy consumption is relatively high
[0007] 2. Secondary pollution is serious. During the incineration of arsenic-containing waste, arsenic is collected in the form of compound dust in the dust collection system. However, the current pure arsenic-containing waste incineration disposal equipment inevitably emits a small amount in the tail gas. At the same time, there will also be certain unorganized emissions, which will pollute the surrounding environment and cause damage to the health of operators.
[0008] 3. The final disposal has not been realized, and the disposed waste residue still needs further disposal. After the arsenic-containing waste residue is treated, there may still be traces of arsenic or other harmful elements in the waste residue. Heavy metal pollution

Method used

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  • Method for treating arsenic-containing waste residues by using cement rotary kiln
  • Method for treating arsenic-containing waste residues by using cement rotary kiln
  • Method for treating arsenic-containing waste residues by using cement rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The method of treating arsenic waste residue by cement rotary kiln:

[0031] Raw material 1: arsenic-containing waste residue

[0032] The main components of arsenic-containing waste residue are shown in the table below:

[0033]

[0034] Raw material 2: limestone 81.92%, sandstone 8.65%, pyrite slag 2.23%, laterite 3.60%, phosphorus slag 3.0%.

Embodiment 2

[0037] Example 2: The method of treating arsenic waste residue by cement rotary kiln:

[0038] Raw material 1: arsenic-containing waste residue

[0039] The main components of arsenic-containing waste residue are shown in the table below

[0040]

[0041] Raw material 2: limestone 81.12%, sandstone 8.25%, pyrite slag 2.03%, laterite 3.60%, phosphorus slag 3.0%.

[0042] Method of implementation:

[0043] Under the operating conditions of maintaining the cement kiln as kiln tail temperature: 1050°C, kiln head temperature: 900-1100°C, speed: 4.1r / min, the weight of the arsenic-containing waste residue in the raw material (the sum of raw material 1 and raw material 2) The percentage is 2.0%. The arsenic-containing waste residue is evenly transported to the raw material mill through the feeder, and then sent to the rotary kiln to produce fired cement clinker. The treated cement clinker is analyzed by X-ray diffractometer. Quantitative determination by diffraction showed that...

Embodiment 3

[0044] Example 3: The method of treating arsenic waste residue by cement rotary kiln:

[0045] Raw material 1: arsenic-containing waste residue

[0046] The main components of arsenic-containing waste residue are shown in the table below

[0047]

[0048] Raw material 2: limestone 80.12%, sandstone 7.26%, pyrite slag 1.93%, laterite 3.60%, phosphorus slag 3.0%.

[0049] Method of implementation:

[0050] Under the operating conditions of maintaining the cement kiln as kiln tail temperature: 1050°C, kiln head temperature: 900-1100°C, speed: 4.1r / min, the weight of the arsenic-containing waste residue in the raw material (the sum of raw material 1 and raw material 2) If the percentage is 4.0%, X-ray diffractometer will be used to carry out diffraction quantitative determination on the treated cement clinker, and the content of arsenic in the clinker is between 196.57 mg / kg and 218.70 mg / kg. Using "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Metho...

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Abstract

The invention discloses a method for treating arsenic-containing waste residues by using a cement rotary kiln, belonging to the field of solid waste and hazardous waste treatment and disposal technologies. The method comprises the steps of (1) mixing the arsenic-containing waste residues with a cement raw material to obtain a raw material for preparing a cement clinker, wherein the arsenic-containing waste residues account for 0.6-4.0% of the weight of the raw material; and (2) putting the raw material obtained by mixing in the step (1) into the cement rotary kiln to prepare an arsenic-containing cement clinker. The method disclosed by the invention has the advantages that the arsenic-containing waste residues are treated through the existing dry method cement rotary kiln to facilitate harmless and resource utilization of the arsenic-containing waste residues, potential environmental pollution risks and secondary pollution during harmless treatment of the arsenic-containing waste residues are effectively controlled, and the environmental benefit and economic benefit are obvious.

Description

technical field [0001] The invention belongs to the technical field of solid waste and hazardous waste treatment and disposal, and specifically relates to a method for treating arsenic-containing waste residue by a cement rotary kiln, and more specifically relates to a method for disposing of arsenic-containing waste residue while using the existing dry-process cement production line to produce cement , a method for realizing harmless and resourceful utilization of arsenic-containing waste residue. Background technique [0002] Arsenic is a metalloid notoriously toxic and has many allotropes. Arsenic exists widely in nature, and arsenic and its compounds are widely used. With the mass production of arsenic, a large amount of arsenic-containing waste residue (also known as arsenic-containing waste) is also produced. Its long-term stockpiling and rainwater leaching have caused serious damage. Environmental issues. At present, there are a large number of arsenic-containing wa...

Claims

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Application Information

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IPC IPC(8): C04B7/24
CPCY02P40/10
Inventor 吴学勇张涛尚江涛牛学奎王金华毕延涛
Owner 云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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