Curing stabilizing agent for treating heavy-metal-containing waste residues and curing method thereof

A technology of stabilizer and heavy metal, applied in the treatment of solidification stabilizer containing heavy metal waste residue and its solidification field, can solve the problems of lack of extraction and recovery methods, low metal content, large difference in morphology, etc., and achieve faster adsorption equilibrium speed and large specific surface area. , the effect of developed pores

CN110216130AInactive Publication Date: 2019-09-10HUNAN QUANZHIYUAN ENVIRONMENTAL PROTECTION SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-09-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a curing stabilizing agent for treating heavy-metal-containing waste residues and a curing method thereof. The curing stabilizing agent comprises the following components in parts by weight: 5-30 parts of methylene bisacrylamide-dimethyl dithiocarbamate compound, 10-50 parts of charcoal, and 20-80 parts of inorganic cementing material. The curing stabilizing agent is specially used for treating the heavy-metal-containing waste residues and is capable of stabilizing easy-transferring heavy metal ions such as arsenic and antimony in manners such as the manners of adsorbing, complexing and chemical precipitating so as to form compounds which are hard to dissolve and hard to transfer, and high stability is maintained. The curing method is characterized in that the heavy-metal-containing waste residues and the curing stabilizing agent are mixed, and water is added and stirred to obtain mortar; and the mortar is naturally maintained for 7-21 days to obtain solid waste residues. With the adoption of the method, the heavy metals can be effectively prevented from leaching and transferring.
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Description

technical field

[0001] The invention relates to the fields of environmental protection and engineering construction, in particular to a solidification stabilizer for treating heavy metal-containing waste residue and a solidification method thereof. Background technique

[0002] Most antimony ores are associated with elements such as arsenic and lead. During the smelting process, arsenic enters the crude antimony after oxidation and reduction. The traditional method is that crude antimony is refined by adding soda ash (sodium carbonate) to remove arsenic and become refined antimony products, and the arsenic compound after arsenic oxidation is discharged as waste, which is called "arsenic-alkali slag".

[0003] Since the arsenic in the arsenic-alkali slag exists in the form of sodium arsenate, which is highly toxic and easily soluble in water, it should not be stored in the open air. At present, the stockpile of arsenic-alkali slag in the country has reached more than 50,000 ...

Examples

Embodiment 1

[0025] The curing stabilizer in the present embodiment comprises the following components in parts by weight:

[0026] Stabilizer methylenebisacrylamide-sodium dimethyldithiocarbamate composite material 25 parts;

[0027] Adsorbent-loaded iron acid-base modified biochar 35 parts;

[0028] 40 parts of curing agent inorganic cementitious material, including 30 parts of cement and 10 parts of lime.

[0029] Taking the waste residue left by an antimony smelter in Xinshao, Hunan Province as the solidification object, the composition of the main harmful elements of the waste residue is shown in Table 1.

[0030] Table 1 Composition of main harmful elements in waste residue left over from an antimony smelter in Xinshao, Hunan

[0031]

[0032] The solidification method of using the solidification stabilizer of this embodiment to treat waste slag containing heavy metals is: mix the waste slag left over from a certain antimony smelter in Xinshao, Hunan Province with the solidifica...

Embodiment 2

[0038] The curing stabilizer in the present embodiment comprises the following components in parts by weight:

[0039] 30 parts of stabilizer methylenebisacrylamide-sodium dimethyldithiocarbamate composite material;

[0040] 30 parts of adsorbent-loaded iron acid-base modified biochar;

[0041] Portland cement 40 parts.

[0042] Taking the waste residue of an antimony smelter in Lengshuijiang, Hunan Province as the solidification object, the composition of the main harmful elements of the waste residue is shown in Table 3.

[0043] Table 3 Composition of main harmful elements in the waste residue of an antimony smelter in Lengshuijiang, Hunan

[0044]

[0045] The solidification method of using the solidification stabilizer of this embodiment to treat waste residue containing heavy metals is: mix the waste residue of a certain antimony smelter in Lengshuijiang, Hunan Province with the solidification stabilizer, the mass ratio of the waste residue to the above solidificati...

Embodiment 3

[0051] The curing stabilizer in the present embodiment comprises the following components in parts by weight:

[0052] 10 parts of stabilizer methylenebisacrylamide-sodium dimethyldithiocarbamate compound;

[0053] 30 parts of adsorbent-loaded iron acid-base modified biochar;

[0054] 60 parts of curing agent inorganic cementitious material, including 50 parts of cement and 10 parts of gypsum.

[0055] Taking the waste slag left over from an antimony smelter in Jiangxi as the solidification object, the composition of the main harmful elements of the waste slag is shown in Table 5.

[0056] Table 5 Composition of main harmful elements in waste residue left over from an antimony smelter in Jiangxi

[0057]

[0058] The solidification method of using the solidification stabilizer of this embodiment to treat waste residue containing heavy metals is: mix the waste residue left over from a certain antimony smelter in Jiangxi with the solidification stabilizer, the mass ratio of...