A method for directly vitrifying arsenic-containing materials containing arsenite

An arsenite, vitrification technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc. Authorized patents and other issues, to achieve the effect of harmless treatment, simple treatment method and wide application range

Active Publication Date: 2022-03-11
ZIJIN MINING GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these vitrification arsenic fixation methods for arsenic-containing materials are long process flow and high pretreatment cost.
At present, there is no research or authorized patent on the direct vitrification of arsenic-containing materials mainly arsenite

Method used

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  • A method for directly vitrifying arsenic-containing materials containing arsenite
  • A method for directly vitrifying arsenic-containing materials containing arsenite
  • A method for directly vitrifying arsenic-containing materials containing arsenite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a method for direct vitrification of arsenic-containing materials mainly composed of ferric arsenite to fix arsenic. Such as figure 1 As shown, the specific steps of the method in this embodiment are as follows:

[0040] Wherein said arsenic-containing material is the ferrous arsenite slag (arsenic and iron contents are respectively As 32.08%, Fe 27.12%).

[0041]The glass substrate contains copper smelting slag (the main component is: Fe 2 o 3 63.6%, SiO 2 23.75%, As 2 o 3 0.264%, Al 2 o 3 2.86%, CaO 1.76%, MgO 1.08%), quartz sand and sodium carbonate.

[0042] Mix the arsenic-containing material, copper smelting slag, quartz sand, and sodium carbonate according to the mass ratio of 27:20:36:14.2, grind them to a powder with a particle size of 0.8mm, and preheat at 250°C for 2.0h (preheat treatment The advantage is to slowly heat the mixture in advance to remove moisture and reduce the impact on the high-temperature melting process...

Embodiment 2

[0044] This embodiment provides a method for direct vitrification of arsenic-containing materials mainly composed of ferric arsenite to fix arsenic.

[0045] The arsenic-containing material is the ferrous arsenite slag obtained by adding ferric sulfate to deposit arsenic after the arsenic-containing polluted acid (As 8.86g / L) is neutralized by lime to reduce the acidity (the arsenic and iron contents are respectively As 32.08%, Fe 27.12% %), the glass substrate contains quartz sand and sodium carbonate.

[0046] The specific steps of the present embodiment method are as follows:

[0047] Mix the arsenic-containing material, quartz sand, and sodium carbonate according to the mass ratio of 58.65:26.6:14.75, grind to a powder with a particle size of 0.6mm, and preheat at 100°C for 0.5h. Then heat up to 1400°C for high temperature melting and heat preservation for 2 hours. After the reaction is completed, it is naturally cooled with the furnace to obtain arsenic-containing glass...

Embodiment 3

[0049] This embodiment provides a method for vitrifying arsenic fixation using calcium arsenite as the main arsenic-containing material.

[0050] The arsenic-containing material is calcium arsenite slag obtained from arsenic-containing polluted acid (As 10.8g / L) through lime neutralization and precipitation (As and calcium contents are respectively As 31.39%, Ca 28.9%), and the glass substrate contains quartz sand and sodium carbonate.

[0051] The specific steps of the present embodiment method are as follows:

[0052] Mix arsenic-containing materials, quartz sand, and sodium carbonate at a mass ratio of 21:57:22, grind them to a powder with a particle size of 0.4mm, preheat at 550°C for 10 minutes, and then heat up to 1350°C for high temperature melting and heat preservation for 1 hour. After the reaction is completed, it is naturally cooled with the furnace to obtain arsenic-containing glass solidified body. The composition (mass percentage) of the arsenic-containing glas...

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Abstract

The invention discloses a method for directly vitrifying arsenic-containing materials containing arsenite, which comprises the following steps: Precipitating arsenic: adding a pH regulator to the arsenic-containing solution, and precipitating soluble arsenous acid (salt) therein Form separation; Mixing ingredients: Mix the arsenic-containing material containing arsenite and the glass substrate according to the designed mass ratio, then pulverize and grind finely; Preheat treatment: Preheat the mixture at 100-550°C Heat treatment, collect the dust generated during the preheating process and return it to the mixed ingredients; high temperature melting: heat the preheated mixture to 1000-1400°C to melt, collect the dust generated during the high temperature melting process and return it to the mixed ingredients; Cooling: cooling the material obtained by high-temperature melting to form arsenic-containing glass solidified body. The invention not only shortens the technological process, reduces the cost of arsenic fixation, but also realizes the stabilization and harmless disposal of the arsenic-containing waste residue, and reduces the risk of environmental pollution.

Description

technical field [0001] The invention relates to the technical field of harmless disposal of hazardous waste, in particular to a method for directly vitrifying arsenic-containing materials containing arsenite. Background technique [0002] Arsenic is an inherent element that exists widely in nature. Its organic and inorganic compounds have varying degrees of toxicity and are extremely harmful to the environment. Key prevention elements. Arsenic is a sulfur-friendly element and is a common element in sulfide ore resources such as copper, lead, and zinc. In the process of resource development, arsenic enters waste gas, wastewater, and waste residue in different forms. In recent years, the gradual increase of arsenic content in non-ferrous metal ore resources has become a common problem, and with the rapid economic development, the demand for ore raw materials is increasing day by day, so arsenic-containing materials, especially arsenic-containing waste, are also significantly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/40B09B3/38B09B5/00A62D3/33A62D101/43
CPCB09B3/00B09B5/00A62D3/33A62D2101/43B09B3/40
Inventor 王乾坤肖琴许涛庄荣传陈景河郭先健林鸿汉廖元杭许晓阳
Owner ZIJIN MINING GROUP
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