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Method for recovering arsenic sulfide from arsenic-containing waste residue

Shengbo Feng, +6 more
TLDR
In this paper, a method for recovering arsenic sulfide from arsenic-containing waste residue, which comprises of the following steps: taking arsenic residue with the arsenic content of 7.1-16.8, stirring and mixing with water, evenly mixing, and gradually adding alkali at the temperature of room temperature-60 DEG C for carrying out leaching treatment, wherein the alkali content is calculated by 2.0-3.5g/g.
Abstract: 
The invention discloses a method for recovering arsenic sulfide from arsenic-containing waste residue, which comprises the following steps: taking arsenic sulfide residue with the arsenic content of 7.1-16.8%, stirring and mixing with water, wherein the water content is calculated by 100-150mL/100g residue; evenly mixing, and gradually adding alkali at the temperature of room temperature-60 DEG C for carrying out leaching treatment, wherein the alkali content is calculated by 2.0-3.5g/g arsenic sulfide; further continuously maintaining the leaching process for 40-120 min after completing the addition of the alkali, and filtering; using water which is calculated by 50mL/100g arsenic sulfide residue for washing the residue step by step, merging filtrate and washing solution, using sulfuric acid with the concentration of 93-98% for neutralization, controlling the pH to be 9-11, filtering, further using the sulfuric acid with the concentration of 93-98% for neutralization till the pH is 1-3.5, adding sodium sulfide for leading the pH to be 2-4, then filtering, carrying out 2-3 times of repulping washing and filtering washing on sediment, obtaining secondary sediment, and drying for obtaining an arsenic sulfide finished product. The method can reduce the reaction temperature, shorten the leaching time and improve the recovery rate of arsenic.

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Patent

Arsenic-containing waste slag solidified body and preparation method thereof

Zhaoshu Zhang, +5 more
TL;DR: In this article, an arsenic-containing waste slag solidified body and a preparation method for the preparation of such a body is described. But the preparation method comprises the following steps of: treating arsenic containing waste slags, mixing the treated slag and a curing agent, a modifying agent, aggregates, water and the like, and stirring, forming and curing the mixed materials to obtain the solidification body with high strength and low arsenic leaching rate.
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Method for recycling arsenic-containing waste residues

Pinjing He, +3 more
Patent

Method for preparing arsenic trioxide by using arsenic sulfide waste residue

Yanrong Ma
TL;DR: In this article, the authors proposed a method for preparing arsenic trioxide by using arsenic sulfide waste slags, which comprises the following steps: lixiviating out arsenic sulfides from the arsenic slags by using a sodium hydroxide solution; mixing the extracted arsenic sulfided with water so as to form a slurry, wherein the water is 2-5 times as heavy as the extracted arsenide; while stirring at room temperature, mixing the slurry with an excess iron persulfate solution to react for 0.5-2 hours; after reaction, filtering so
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Method for preparing arsenic trioxide by arsenic-containing waste water

Yanrong Ma
TL;DR: In this paper, a method for preparing arsenic trioxide by arsenic-containing waste water, which comprises the steps of: adjusting the PH value of the arsenic containing waste water to be 5.5-6.5 by sodium hydroxide, and filtering out impurity to obtain filter liquor; reacting the filer liquor with excessive copper sulfate solution in a mixing way, adjusting the pH value of reaction solution to be 8.0-9.0 by sodium hyroxide and filtering the reaction solution, and washing the copper arsenite precipitate by water, mixing the
Patent

Method for preparing arsenic trioxide from arsenic sulfide waste

Yanrong Ma
TL;DR: In this article, the authors proposed a method for preparing arsenic trioxide from arsenic sulfide waste, in which the mixture of arsenous acid and elemental sulfur was used to extract the arsenic from the waste, and the reaction product was filtered to remove elemental sulfur.