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Method for leaching and simultaneously stabilizing arsenic sulfide slag

An arsenic sulfide and leaching technology, which is applied in the direction of arsenate/arsenite, etc., can solve the problems of prolonging the synthesis time of scorodite and long reaction cycle, etc., and achieve easy solid-liquid separation, simple operation, and strong practicability Effect

Inactive Publication Date: 2016-09-28
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can eventually synthesize scorodite crystals, the reaction period is too long, and does not involve the oxidative leaching process of arsenic sulfide slag, and the microbial strains used in it are room-temperature or mesophilic microorganisms, which cannot function at high temperatures, so prolonged The time of scorodite synthesis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for leaching and synchronously stabilizing arsenic sulfide slag, the specific operation steps are as follows:

[0019] 1. Add 1L of the Leatheren medium in a constant temperature mechanically stirred reactor with a volume of 1.5L, the composition of which is (NH 4 ) 2 SO 4 0.05g / L, K 2 HPO 4 0.05g / L, MgSO 4 ·7H 2 O 0.5g / L, KCl 0.05g / L, Ca(NO 3 ) 2 0.01g / L, and add 0.01% yeast extract as the leaching system to carry out the leaching reaction. The leaching reaction is carried out in a constant temperature mechanically stirred reactor with an inflatable tube, and the temperature is controlled at 70°C.

[0020] 2. Add finely ground arsenic sulfide slag to the leaching solution prepared in step 1 and start stirring at a stirring speed of 300r / min. The mass concentration of the obtained pulp is 10%, wherein the particle size of the arsenic sulfide slag is -0.075mm or greater 80%; the main components of the arsenic sulfide slag are as follows: As 38.90%, S ...

Embodiment 2

[0026] The present invention will be further described below in conjunction with embodiment. It should be understood that these examples are only for illustration of the present invention, but not to limit the scope of the present invention in any way.

[0027] A method for leaching and synchronously stabilizing arsenic sulfide slag, the specific operation steps are as follows:

[0028] 1. Same as Step 1 of Example 1.

[0029]2. Add finely ground arsenic sulfide slag to the leaching solution prepared in step 1 and start stirring at a stirring speed of 300r / min. The mass concentration of the obtained pulp is 15%, wherein the particle size of the arsenic sulfide slag is -0.075mm or greater 80%; the main components of the arsenic sulfide slag are as follows: As 38.90%, S 36.20%, SiO 2 23.12%.

[0030] 3. According to the arsenic content in the arsenic slag, add ferrous sulfate to the pulp so that the molar ratio of iron to arsenic is 3:1, and then adjust the pH of the pulp to...

Embodiment 3

[0035] A method for leaching and synchronously stabilizing arsenic sulfide slag, the specific operation steps are as follows:

[0036] 1. Same as Step 1 of Example 1.

[0037] 2. Add finely ground arsenic sulfide slag to the leaching solution prepared in step 1 and start stirring at a stirring speed of 300r / min. The mass concentration of the obtained pulp is 10%, wherein the particle size of the arsenic sulfide slag is -0.075mm or greater 80%; the main components of the arsenic sulfide slag are as follows: As 38.90%, S 36.20%, SiO 2 23.12%.

[0038] 3. According to the arsenic content in the arsenic slag, add ferrous sulfate to the pulp so that the molar ratio of iron to arsenic is 1.5:1, and then adjust the pH of the pulp to 2.0 with sulfuric acid.

[0039] 4. Add Metallococcus industriousness to the pulp to make the cell concentration reach 1×10 7 pcs / mL, then air is introduced, the air flow rate is controlled at 1L / min, and the leaching reaction starts, and the temperat...

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Abstract

The invention relates to a method for leaching and simultaneously stabilizing arsenic sulfide slag. The method comprises the following steps: preparing ore pulp from arsenic sulfide slag under the acid condition, adding ferrous sulfate, thermophilic iron oxide microbial strains and microbial culture medium salt, filling air and stirring, oxidizing and leaching arsenic sulfide slag under the temperature of 70-95 DEG C and a pH value of 0-2.0 by taking trivalent iron generated by microbial ferrous oxide, simultaneously adsorbing iron and arsenic by using microbial cell surface and accelerating generation of scorodite crystals. The method is simple in process flow and low in cost; the concentration of arsenic leached by the generated scorodite crystals meets the stipulation of solid waste identification standard which is leaching toxicity identification (GB5085.3-2007); the arsenic can be safely piled and stored; the leaching solution can be reused.

Description

technical field [0001] The invention relates to the stabilization treatment of arsenic-containing waste residue, specifically a method for leaching and synchronously stabilizing arsenic sulfide residue, which is suitable for treating dirty acid by sulfuration method in non-ferrous metal smelting and phosphoric acid chemical industry after removing arsenic by sulfuration method The obtained arsenic sulfide waste residue. Background technique [0002] Arsenic is widely associated with copper, lead, zinc, gold and other non-ferrous metal minerals and phosphorus minerals, and enters the flue gas and waste residue during the non-ferrous metal pyro-smelting process. Part of the arsenic in the flue gas is directly recovered in the form of arsenic trioxide in the dust removal stage, and the remaining arsenic is recovered with SO 2 Enter the acid system, and form arsenic sulfide waste residue through sulfidation precipitation treatment. In the phosphoric acid chemical industry, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G28/02
CPCC01G28/02
Inventor 张立宏宋红军曾广庆赵侣璇刘凯覃楠钧宋晓薇罗栋源樊勇吉冯媛
Owner SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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