Stable detoxifying treatment method of heavy metal wastes

A technology for stabilizing treatment and heavy metals, applied in sustainable waste treatment, solid waste management, solid waste removal, etc., can solve the problems of large consumption of chemical reagents, high treatment cost, complex process flow, etc. To achieve the effect of safe disposal and simple process

Active Publication Date: 2019-08-16
安徽浩悦环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method takes into account the recovery and reuse of chromium, the process needs to consume a large amount of chemical reagents such as acid and precipitant, and the process is complicated, the treatment cost is high, and the large amount of waste water in the process also causes certain environmental protection pressure.
[0005] Chinese patent "a kind of technique of detoxifying chromium slag by dry method" (CN106187146A), adopts 96% aluminum oxide, lightly burned magnesium powder of QM-95 brand and anthracite powder to prepare additives, dyes and chromium slag mixed roasting, although solved A large amount of waste water is produced, but the process requires high-purity alumina, light-burned magnesium powder, and anthracite, which is costly, and the roasting temperature is as high as 600-1000°C, which consumes a lot of energy, especially the equipment requires a lot of cost

Method used

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  • Stable detoxifying treatment method of heavy metal wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 100g of chromium-containing waste slag with a hexavalent chromium content of 8%, grind it with a ball mill and pass through a 100-mesh sieve to obtain chromium slag powder, add 100g of iron-rich cutting mud (the iron content is 25%), stir well and then add acidity to 0.2mol / L 268ml of waste inorganic sulfuric acid, stir evenly, place for 1 day, add 100g of cement and 10g of lime, stir and solidify, and conduct leaching toxicity test on the solidified product. At the same time, two groups of tests with the same amount of raw materials were done, and they were placed for 2 days and 3 days respectively, and the leaching toxicity test was carried out on the cured products. The content of hexavalent chromium in the leachate is shown in Table 1.

Embodiment 2-9

[0022] Adopt the same method of embodiment 1, the chromium-containing waste quality is constant, with the consumption of waste acid concentration / volume, iron-rich cutting mud (iron content is 25%), organic amine salt waste residue (organic amine salt content is 4%) To detoxify the variables, see Table 1 for specific data. After the detoxification is completed, the leaching toxicity test is carried out on the cured products left for 1, 2, and 3 days respectively, and the content of hexavalent chromium in the leaching solution is recorded in Table 1.

[0023] Raw material consumption and hexavalent chromium content in the leaching solution in Table 1 embodiment 1-9

[0024]

[0025] It can be seen from Table 1 that increasing the amount of waste acid can effectively speed up the detoxification process of chromium-containing waste, and the detoxification effect is also better; The detoxification effect of the waste can reach the hexavalent chromium content of less than 2.5mg...

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Abstract

The invention belongs to the technical field of waste treating, and specifically relates to a stable detoxifying treatment method of a heavy metal wastes. The method comprises the following steps: a)adding iron-rich cutting mud and / or organic amine salt waste slags to a solid chrome containing waste; and uniformly stirring to obtain a mixture A; b) adding acid liquid to the mixture A; uniformlystirring; and standing for 1-3 days to obtain a mixture B; and c) curing and burying the mixture B. According to the scheme, the method has the advantages that the iron-rich cutting mud and the organic amine salt waste slags are treated as reducing agents for reducing hexavalent chromium into trivalent chromium, and thus the detoxifying effect is achieved; the acid liquid can be the wasted liquidproduced in industrial production and acts like a catalyst. Therefore, a plurality of industrial waste slags and waste liquid are utilized to treat high-toxicity chrome containing wastes; the wastes are treated through wastes; and the method is safe and effective.

Description

technical field [0001] The invention belongs to the technical field of waste disposal, and in particular relates to a method for detoxification and stabilization treatment of heavy metal waste. Background technique [0002] Chromium-containing wastes are industrial wastes produced during the production of metallic chromium and chromium salts, which are highly toxic. If chromium-containing wastes are piled up in the open air and soaked by rain and snow, the hexavalent chromium contained in them will gradually be dissolved and enter the surrounding soil, groundwater, rivers and lakes, seriously polluting the environment, especially, contact with human skin may cause sensitivity, More likely to cause inherited genetic defects and may cause cancer if inhaled. [0003] Existing methods for treating chromium-containing wastes include dry detoxification, wet detoxification and biological methods, the core idea of ​​which is to reduce highly toxic and highly mobile hexavalent chrom...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00Y02W30/91
Inventor刘友舫胡长江高铭政项艳郑传扬张晗辰郭鹏飞汪师园
Owner安徽浩悦环境科技股份有限公司