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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

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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 uses cement and carbide slag to The residue has been stabilized and solidified, but the solidified body produced by this method is easily eroded by leachate, and there is a risk of secondary pollution; Chinese patent document CN101824543 introduces the method of vulcanization treatment of heavy metal waste and the recovery of valuable metals. The method combines high temperature, high pressure, flotation and other processes to recover metals, so as to realize the harmless resource disposal of heavy metal waste residues, but there are problems of high cost and incomplete recovery of heavy metals; Chinese patent document CN 102560124 introduces a rotary A treatment method for reclaiming heavy metal solid waste from a kiln, this type of method has good social benefits, but it is easy to produce secondary pollution in the process; Chinese patent document CN 1493537 A discloses a treatment method for dicyandiamide waste residue, which can The method or bleaching powder oxidation method removes cyanide in the waste residue. This method completely breaks cyanide, but produces a large amount of salt, which affects the treatment of leachate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0045] The processing method of the mercury-containing waste residue of the present embodiment may further comprise the steps:

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

Embodiment 2

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

[0049] The processing method of the arsenic slag of the present embodiment comprises the following steps:

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

Embodiment 3

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

[0053] The processing method of the cyanogen-containing waste residue of the present embodiment may further comprise the steps:

[0054] First add 30g of plaster powder and 8ml of water to a beaker containing 100g of crushed cyanide-containing waste residue, and continue stirring. After stirring, the materials in the stirring reactor form uniform spherical particles; then add 3ml of liquid paraffin to coat the spherical particles ; Continue to add 15g of plaster powder and 5ml of water to granulate, and the particle size increases; after natural drying and curing for 1 day, coat the material with 20ml...

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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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