Cadmium-containing waste residue curing method

Abstract

The invention discloses a method for curing cadmium-containing waste residues. The method comprises the following steps: S1, respectively grinding the dried cadmium-containing waste residue, iron-containing sludge and bentonite into fine particles; s2, uniformly mixing the cadmium-containing waste residue fine particles, the iron-containing sludge fine particles and the bentonite fine particles according to a ratio, adding the mixed material into a high-speed mill, and grinding to form an iron-cadmium solid solution from a cadmium component and an iron component, so as to obtain a ground material after the grinding is finished; and S3, sintering and curing the ground material under an oxygen-enriched atmosphere condition, and cooling to obtain a cured body. According to the method, cadmium components, iron components, aluminum components, oxygen components and silicon components in the cadmium-containing waste residues, the iron-containing sludge and the bentonite are fully activated through the mechanochemical effect, stable fixation of cadmium ions is achieved, then structured curing is achieved through sintering curing, efficient and stable curing of the cadmium-containing waste residues is achieved, and the method is suitable for industrial production. Meanwhile, the iron-containing sludge is utilized and treated, and the effect of harmless and recycling co-treatment of various solid wastes is achieved.

Description

technical field

[0001] The invention relates to the field of harmless disposal of heavy metal waste, in particular to a method for solidifying cadmium-containing waste residue. Background technique

[0002] Cadmium is highly toxic and can be enriched in organisms and enter the human body through the food chain to cause chronic poisoning. The sources of cadmium-containing waste residues mainly include cadmium mines, cadmium smelters, electroplating, waste residues produced by factories using cadmium compounds as raw materials or catalysts, and waste water treatment sludge. In addition to a certain amount of cadmium, the cadmium-containing waste residue also contains a small amount of organic matter and other heavy metal ions such as Zn, Cu, Ni, and Cr. It is a hazardous waste. If it is not treated, it will easily cause serious pollution to the environment. How to safely dispose of cadmium-containing waste residues has always been a technical problem in the field of environme...

Examples

Embodiment 1

[0029] In this embodiment, the method for solidifying cadmium-containing waste residue is as follows: figure 1 As shown, the specific method is as follows:

[0030] Dry cadmium-containing waste residue, iron-containing sludge and bentonite to reduce the moisture content of cadmium-containing waste residue, iron-containing sludge and bentonite from 60%, 65% and 42% to less than 10% respectively, and use a rod mill to separate Grind the dried cadmium-containing waste residue, iron-containing sludge and bentonite to fine particles with a particle size of -45 μm.

[0031] The cadmium-containing waste slag fine particles, iron-containing sludge fine particles and bentonite fine particles obtained after the aforementioned grinding are uniformly mixed at a dry basis mass percentage of 18%: 55%: 27% to form a mixed material, and the mixed material is added to the vertical Grind in a planetary ball mill for 5 hours at a speed of 450 rpm. The obtained fine-grained grinding product was...

Embodiment 2

[0036] In this embodiment, the method for solidifying cadmium-containing waste residue is as follows: figure 1 As shown, the specific method is as follows:

[0037]Dry cadmium-containing waste residue, iron-containing sludge and bentonite to reduce the moisture content of cadmium-containing waste residue, iron-containing sludge and bentonite from 60%, 65% and 42% to less than 10% respectively, and use a rod mill to separate Grind the dried cadmium-containing waste residue, iron-containing sludge and bentonite to -45 μm. The cadmium-containing waste slag fine particles, iron-containing sludge fine particles and bentonite fine particles obtained after grinding are uniformly mixed at a dry basis mass percentage of 15%: 55%: 30%, and the mixed materials are added to a vertical planetary ball mill for grinding. Grind for 5.5 hours at 450 rpm. The obtained fine-grained grinding product was put into a tube furnace for oxygen-enriched sintering and curing. The sintering and curing t...

Embodiment 3

[0040] In this embodiment, the method for solidifying cadmium-containing waste residue is as follows: figure 1 As shown, the specific method is as follows:

[0041] Dry cadmium-containing waste residue, iron-containing sludge and bentonite to reduce the moisture content of cadmium-containing waste residue, iron-containing sludge and bentonite from 60%, 65% and 42% to less than 10% respectively, and use a rod mill to separate Grind the dried cadmium-containing waste residue, iron-containing sludge and bentonite to 45 μm. The cadmium-containing waste slag fine particles, iron-containing sludge fine particles and bentonite fine particles obtained after grinding are mixed uniformly at a dry basis mass percentage of 10%:55%:35% to form a mixed material, and the mixed material is added to the vertical planetary Grind in a ball mill for 6 hours at a speed of 400 rpm. The obtained fine-grained grinding product was put into a tube furnace for oxygen-enriched sintering and curing. The...

technical field

[0001] The invention relates to the field of harmless disposal of heavy metal waste, in particular to a method for solidifying cadmium-containing waste residue. Background technique

[0002] Cadmium is highly toxic and can be enriched in organisms and enter the human body through the food chain to cause chronic poisoning. The sources of cadmium-containing waste residues mainly include cadmium mines, cadmium smelters, electroplating, waste residues produced by factories using cadmium compounds as raw materials or catalysts, and waste water treatment sludge. In addition to a certain amount of cadmium, the cadmium-containing waste residue also contains a small amount of organic matter and other heavy metal ions such as Zn, Cu, Ni, and Cr. It is a hazardous waste. If it is not treated, it will easily cause serious pollution to the environment. How to safely dispose of cadmium-containing waste residues has always been a technical problem in the field of environme...

Examples

Embodiment 1

[0029] In this embodiment, the method for solidifying cadmium-containing waste residue is as follows: figure 1 As shown, the specific method is as follows:

[0030] Dry cadmium-containing waste residue, iron-containing sludge and bentonite to reduce the moisture content of cadmium-containing waste residue, iron-containing sludge and bentonite from 60%, 65% and 42% to less than 10% respectively, and use a rod mill to separate Grind the dried cadmium-containing waste residue, iron-containing sludge and bentonite to fine particles with a particle size of -45 μm.

[0031] The cadmium-containing waste slag fine particles, iron-containing sludge fine particles and bentonite fine particles obtained after the aforementioned grinding are uniformly mixed at a dry basis mass percentage of 18%: 55%: 27% to form a mixed material, and the mixed material is added to the vertical Grind in a planetary ball mill for 5 hours at a speed of 450 rpm. The obtained fine-grained grinding product was...

Embodiment 2

[0036] In this embodiment, the method for solidifying cadmium-containing waste residue is as follows: figure 1 As shown, the specific method is as follows:

[0037]Dry cadmium-containing waste residue, iron-containing sludge and bentonite to reduce the moisture content of cadmium-containing waste residue, iron-containing sludge and bentonite from 60%, 65% and 42% to less than 10% respectively, and use a rod mill to separate Grind the dried cadmium-containing waste residue, iron-containing sludge and bentonite to -45 μm. The cadmium-containing waste slag fine particles, iron-containing sludge fine particles and bentonite fine particles obtained after grinding are uniformly mixed at a dry basis mass percentage of 15%: 55%: 30%, and the mixed materials are added to a vertical planetary ball mill for grinding. Grind for 5.5 hours at 450 rpm. The obtained fine-grained grinding product was put into a tube furnace for oxygen-enriched sintering and curing. The sintering and curing t...

Embodiment 3

[0040] In this embodiment, the method for solidifying cadmium-containing waste residue is as follows: figure 1 As shown, the specific method is as follows:

[0041] Dry cadmium-containing waste residue, iron-containing sludge and bentonite to reduce the moisture content of cadmium-containing waste residue, iron-containing sludge and bentonite from 60%, 65% and 42% to less than 10% respectively, and use a rod mill to separate Grind the dried cadmium-containing waste residue, iron-containing sludge and bentonite to 45 μm. The cadmium-containing waste slag fine particles, iron-containing sludge fine particles and bentonite fine particles obtained after grinding are mixed uniformly at a dry basis mass percentage of 10%:55%:35% to form a mixed material, and the mixed material is added to the vertical planetary Grind in a ball mill for 6 hours at a speed of 400 rpm. The obtained fine-grained grinding product was put into a tube furnace for oxygen-enriched sintering and curing. The...

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