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Stabilization treatment method for iron-antimony waste residues

A technology for stabilization treatment and waste residue, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve problems such as thermodynamic instability, secondary pollution, poor stability, etc.

Pending Publication Date: 2022-07-05
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this process, a large amount of iron-antimony waste slag that absorbs antimony with iron hydroxide will be produced. Because the thermodynamics of ferric hydroxide is unstable, and the antimony in the iron-antimony waste slag exists in an adsorbed state, the stability is poor, and open-air stacking will Risk of causing secondary pollution

Method used

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  • Stabilization treatment method for iron-antimony waste residues
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preparation example Construction

[0028] In the present invention, the preparation method of the simulated iron and antimony waste residue preferably includes the following steps:

[0029] The NaOH solution and the iron ion solution are mixed to obtain a turbid liquid; the turbid liquid is sequentially subjected to pH value adjustment, standing and filtration to obtain a filter cake; after mixing the filter cake, the sodium chloride solution and the antimony salt solution , centrifuged to obtain simulated iron-antimony waste residue.

[0030] In the present invention, the preparation method of the iron ion solution is preferably FeCl 3 ·4H 2 O is dissolved in water to obtain an iron ion solution. In the present invention, the water is preferably deionized water, and the FeCl 3 ·4H 2 The mass volume ratio of O and water is preferably (20 to 100) g:1L, and more preferably 54 g:1L.

[0031] In the present invention, the molar concentration of the NaOH solution is preferably 0.5-1.5 mol / L, more preferably 1 m...

Embodiment 1

[0048] 27g FeCl 3 ·4H 2 O and 500 mL of deionized water were stirred at room temperature for 10 min at 100 r / min to obtain an iron ion solution; 300 mL of 1 mol / L NaOH solution was poured into the iron ion solution, and then 30 mL of 1 mol / L NaOH solution was added at a rate of 50 drops / min The turbid solution was then added dropwise to the iron ion solution at a rate of 100 ppm to obtain a turbid solution; then the turbid solution was diluted to 1000 mL with deionized water, and the pH value of the diluted solution was adjusted with sodium hydroxide to 7.5, and then allowed to stand for 4 hours. , then carry out positive pressure filtration at a pressure of 0.15Mpa, and wash with deionized water 3 times during the filtration process to obtain a filter cake; after mixing 4g of filter cake and 990mL of anaerobic water, add 10mL of 0.5mol / L sodium chloride solution , and passed nitrogen at a rate of 150mL / min for 12h aeration; the aerated product and sodium pyroantimonate solut...

Embodiment 2

[0051] The difference with Example 1 is that in the process of preparing the simulated iron-antimony waste residue, the mol ratio of trivalent iron and pentavalent antimony in the vibration product is 50:1, the content of antimony in the simulated iron-antimony waste residue is 6000 mg / kg, and the remaining contents Consistent with Example 1.

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Abstract

The invention belongs to the technical field of solid waste treatment, and particularly relates to a stabilization treatment method for iron-antimony waste residues. According to the method, an anaerobic environment is created by deoxidizing to prevent ferrous ions from being oxidized, the pH value of the iron-antimony waste residue suspension is adjusted to enable more ferrous ions to be adsorbed on the surface of the iron-antimony waste residue, and ferrous salt serving as a reducing agent can promote crystal conversion of amorphous ferric hydroxide in the iron-antimony waste residue to crystalline lepidocrocite or goethite. Active oxygen substances can be formed in the crystal conversion process of iron, so that trivalent antimony in the iron-antimony waste residues is oxidized under the condition that an exogenous oxidizing agent is not added to generate pentavalent antimony, and the toxicity of antimony is reduced; moreover, due to the generation of the crystalline lepidocrocite or goethite, antimony adsorbed on the surface of the iron-antimony waste residue is embedded into crystal lattices of stable iron minerals to inhibit desorption of antimony ions, the mobility and toxicity of antimony in the iron-antimony waste residue are reduced, the stability of the iron-antimony waste residue is improved, and the stabilized iron-antimony waste residue can stably exist under weak acid and alkaline conditions.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a stabilization treatment method for iron and antimony waste residue. Background technique [0002] Antimony (Sb), with atomic number 51, is located in main group V of the fifth period of the periodic table, and is a naturally occurring toxic heavy metal element. Antimony and its compounds are considered to be hazardous to human health and even carcinogenic, and are listed as priority pollutants by the U.S. Environmental Protection Agency and the European Union. Antimony and its compounds are widely used in the fields of glass, ceramics, flame retardants and alloys. However, in the process of mining and smelting, a large amount of waste water containing antimony will be produced, which will be directly discharged into the soil and water bodies, causing environmental pollution, harming the ecosystem and affecting human health. [0003] Iron coagulation ...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B3/30B09B3/40B09B3/65
CPCB09B3/00
Inventor 王少锋尹秀玲贾永锋苏瑞马旭
Owner DALIAN UNIV OF TECH
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