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Stable curing method of arsenic sulfide waste slag

一种固化方法、硫化砷的技术，应用在化学仪器和方法、固体废物的清除、运输和包装等方向，能够解决处理成本高、养护时间长、不利效率的等问题，达到处理效率高、养护时间短、操作简单的效果

Active Publication Date: 2016-01-06
YANGZHOU JIEJIA IND SOLID WASTE HANDLING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is the wet method, which uses acid leaching, alkali leaching or salt leaching to separate the arsenic from the waste residue, and then further recover arsenic products or perform harmless treatment; the wet method has the advantages of low energy consumption, less pollution, and high efficiency. High advantages, but the process is complicated and the processing cost is high
However, the maintenance time of this process needs 28 days, and the maintenance time is too long, which is not conducive to the improvement of efficiency in the actual production process

Method used

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  • Stable curing method of arsenic sulfide waste slag

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Experimental program
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Effect test

Embodiment 1）

[0025] The strongly acidic arsenic sulfide waste slag treated in this example comes from the sulfuric acid production workshop. According to the "Identification Standard for Hazardous Waste Corrosion Identification" (GB5085.1-2007), the pH value of the waste leaching solution is 1.2; Ethyl dithiocarbamate silver spectrophotometry" (GB / T15555.3-1995) measured the leaching concentration of arsenic as 1780mg / L.

[0026] The stable solidification method of the strongly acidic arsenic sulfide waste residue of the present embodiment comprises the following steps:

[0027] ①Weigh 50g of strong acid arsenic sulfide slag to be treated, add 50g of heavy metal sludge with a moisture content of 50% to it, stir for 40 minutes, and the material after stirring is muddy. The mass ratio of strongly acidic arsenic sulfide slag to heavy metal sludge is 1:1.

[0028] The heavy metal sludge is heavy metal-containing sludge produced after wastewater treatment in industries such as metallurgy, elec...

Embodiment 2）

[0042] The stable solidification method of the strongly acidic arsenic sulfide waste residue of the present embodiment is the same as embodiment 1 except that:

[0043] In step ①, add 75 g of heavy metal sludge with a moisture content of 85% to 50 g of strongly acidic arsenic sulfide slag, and stir for 20 minutes. The mass ratio of strongly acidic arsenic sulfide slag to heavy metal sludge is 1:1.5.

[0044] Step 2. Add 60g of calcium hydroxide powder to the muddy material obtained in step 1. After stirring for 20 minutes, all the yellow substances in the muddy material disappear and become slightly black. The mass ratio of strongly acidic arsenic sulfide waste residue to calcium hydroxide powder is 1:1.2.

[0045] Step 3. Add 25g of yellow sand and 25g of cement to the slightly black material obtained after stirring in step 2.

[0046] According to the "Identification of Toxic Substance Content in Hazardous Waste Identification Standards" (GB5085.6-2007), the original stron...

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Abstract

The invention discloses a stable curing method of arsenic sulfide waste slag. The method comprises the following steps: (1) heavy metal sludge is added in arsenic sulfide slag to be treated for stirring to obtain a slurry material; (2) calcium hydroxide powder is added in the slurry material obtained in the step (1) in the stirring state for continuous stirring until red substances in the slurry material are all disappeared; (3) yellow sand and cement are added in the material obtained by stirring in the step (2); and (4) the stirring material obtained in the step (3) is cooled to the normal temperature, is transferred to a forming mold for molding, is taken out from the mold, and is maintained at the normal temperature to obtain a curing body accordant with the landfill standard. The method uses the heavy metal sludge as an arsenic stabilizing agent for treating wastes by wastes; the sources of such materials as heavy metal sludge, lime, cement and yellow sand needed to treat the strong-acid arsenic sulfide waste slag are wide; other medicaments are not needed to be added; and compared with other methods, the method is lower in treatment cost.

Description

[0001] This application is a divisional application of the invention patent application with the application number 201410402270.5 and the application date on August 15, 2014, and the invention name is "Method for Stable Solidification of Strongly Acidic Arsenic Sulphide Waste Residue". technical field [0002] The invention relates to a harmless treatment process for solid hazardous waste, in particular to a stable solidification method for strongly acidic arsenic sulfide waste residue. Background technique [0003] In the sulfuric acid and phosphoric acid industries, sulfide (hydrogen sulfide or phosphorus sulfide) is added under strong acidic conditions for deep arsenic removal. The resulting arsenic sulfide slag is orange and has strong acidity, and contains 10% to 20% of arsenic. The pH value of the leaching solution of arsenic slag is 0.5-2.0, and the content of arsenic in the leaching solution measured by leaching toxicity test is 1560mg / L-1780mg / L. According to the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/20
Inventor 尚通明周书利樊红杰岳喜龙刘维桥仲鹏鹏
Owner YANGZHOU JIEJIA IND SOLID WASTE HANDLING CO LTD
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