Stabilization and solidification method of highly toxic waste residues

A solidification method and waste residue technology, which are applied in the removal of solid waste and other directions, can solve the problems of incomplete recovery of heavy metals, complicated treatment processes, and erosion of solidified bodies, and achieve the effects of saving coating materials, convenient addition and easy transportation.

Active Publication Date: 2015-04-01
扬州杰嘉工业固废处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent document CN102580979 introduces a solidification/stabilization method for mercury-containing hazardous waste, which uses a chemical reagent to treat natural zeolite, so that the treated zeolite has a better effect of enriching mercury, and then uses chemical Phosphate ceramics are used as a curing agent to solidify mercury-containing waste residues. This method is effective but the process for treating natural zeolite is relatively complicated; Chinese patent document CN 102151690 discloses a method for treating arsenic sulfide residues, and proposes a stabilizing agent The method for treating arsenic sulfide slag is to add inorganic flocculant liquid to arsenic sulfide slag, stir evenly, then add solid powder adsorbent, stir evenly, finally add asbestos wool and stir, and maintain in a sealed bag. The disadvantage of this method is A large amount of stabilizing agent needs to be added, the operation is complicated, and the relative treatment cost is relatively high; Chinese patent document CN102205340 introduces a process for recycling hazardous waste incineration ash, which not only recovers metals, but also

Method used

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Examples

Experimental program
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Effect test

Example Embodiment

[0043] Example 1

[0044] The highly toxic waste residue processed in this embodiment comes from a large amount of mercury chloride catalyst catalyst in the process of producing polyethylene from acetylene. The carrier is activated carbon and the particle size is below 3 mm. After analysis, the mercury chloride content is 1%.

[0045] The processing method of mercury-containing waste residue of this embodiment includes the following steps:

[0046] First, add slaked lime powder to a beaker containing 100g of mercury-containing catalyst to adjust the pH to 11.89; then add 10g of industrial thiourea solution (content 30%) and mix well; then add 30g of calcined gypsum powder and 8g of water, and continue stirring for 10 minutes. After stirring, the materials in the mixing container form uniform spherical particles; then add 7ml of liquid paraffin to coat spherical particles; continue to add 10g of plaster of paris powder and 3ml of water to granulate, the particle size increases; after ...

Example Embodiment

[0047] Example 2

[0048] The highly toxic waste slag processed in this example comes from the arsenic slag of the food phosphoric acid dearsenic production workshop. The leaching liquid of the waste slag is measured according to GB / T 15555.3-1995 "Determination of Arsenic in Solid Wastes by Silver Diethyldithiocarbamate Spectrophotometry" The arsenic content is 300ppm; the soluble content is 72%.

[0049] The processing method of arsenic slag in this embodiment includes the following steps:

[0050] First, add slaked lime powder to a beaker containing 100g of arsenic slag broken to a particle size of 3mm to adjust the pH to 9.4; then add 7g of 30% sodium sulfide solution and 1g of 10% heavy metal chelating agent solution; then add 20g of plaster powder Mix 5ml with water and continue to stir. After stirring, the material will form spherical particles; then add 6ml of liquid paraffin to coat spherical particles; continue to add 15g of plaster powder and 5ml of water for granulation,...

Example Embodiment

[0051] Example 3

[0052] The highly toxic waste residue processed in this embodiment comes from the cyanide-containing waste residue of the cyanate ester resin production workshop. According to HJ 484-2009 "Water Quality Cyanide Determination Volume Method and Spectrophotometry", the cyanide content in the waste residue leachate is 59 ppm; The soluble content is 80%, and the pH of the extract is 10.34.

[0053] The method for processing cyanide-containing waste residue in this embodiment includes the following steps:

[0054] First, add 30g of plaster of paris powder and 8ml of water into a beaker containing 100g of crushed cyanide-containing waste residue, continue to stir, stir the materials in the reactor to form uniform spherical particles after stirring; then add 3ml of liquid paraffin to coat spherical particles ; Continue to add 15g of plaster of Paris powder and 5ml of water for granulation, and the particle size will increase; after natural drying and curing for 1 day, use...

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Abstract

The invention relates to a stabilization and solidification method of highly toxic waste residues containing one or more of mercury, arsenic, chromium, cadmium and cyanide. Heavy metal is stabilized through chemicals, and then the highly toxic waste residues are sequentially wrapped with gypsum plus paraffin and epoxy resin. After four times of wrapping and two times of solidification, highly toxic substances in the waste residues are fully solidified into a solidified body, and the generated solidified body is high in strength and long in stability, and can be buried conveniently later.

Description

technical field [0001] The invention relates to hazardous waste disposal technology, in particular to a method for stabilizing and solidifying highly toxic and dangerous waste residue. Background technique [0002] According to the "Law of the People's Republic of China on the Prevention and Control of Solid Waste Pollution", hazardous waste refers to waste with hazardous characteristics that is included in the national hazardous waste list or identified according to the national hazardous waste identification standards and identification methods. [0003] With the development of industry, the hazardous waste discharged from industrial production process is increasing day by day. It is estimated that 330 million tons of hazardous waste are generated worldwide each year. Due to the serious pollution and potential serious impact of hazardous waste, some companies try their best to transfer hazardous waste to industrially underdeveloped countries and regions. [000...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 岳喜龙仲鹏鹏肖世健郭杰樊红杰丁劼
Owner 扬州杰嘉工业固废处置有限公司
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