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Method for separating and recovering selenium and mercury in acid mud through one-step method

A technology for separation and recovery of acid sludge, applied in the direction of element selenium/tellurium, improvement of process efficiency, binary selenium/tellurium compounds, etc., can solve the problems of difficult separation of selenium and mercury, complicated technical process, etc., and achieve short mercury separation process , high safety release control, high separation efficiency

Active Publication Date: 2021-10-22
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art, such as complex acid mud treatment process and difficult separation of selenium and mercury, the present invention provides a one-step method for separating and recovering selenium and mercury in acid mud, that is, directly separating selenium and mercury in acid mud Roasted as SeO 2 And mercury, mercury is recovered by condensation, selenium dioxide is recovered and refined, and the mercury-containing slag and selenium-containing slag produced in the process are re-refined, so as to realize the efficient and simple treatment of harmful acid sludge

Method used

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  • Method for separating and recovering selenium and mercury in acid mud through one-step method
  • Method for separating and recovering selenium and mercury in acid mud through one-step method
  • Method for separating and recovering selenium and mercury in acid mud through one-step method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the method (see figure 1 ),Specific steps are as follows:

[0026] (1) Slurry: Mix the acid mud with the slurry liquid and slurry at a temperature of 25°C for 120 minutes to obtain a slurry; wherein the mass content of mercury in the dried acid mud is 1%, the mass content of selenium is 1%, and the acid mud The solid-to-liquid ratio g:mL of the slurry is 1:6, the slurry contains hydrochloric acid and oxidant (potassium permanganate), the concentration of hydrochloric acid in the slurry is 20g / L, and the concentration of oxidant in the slurry is 2g / L;

[0027] (2) Roasting: put the slurry in step (1) at a temperature of 400°C and microwave in an air atmosphere for 20 minutes to obtain Hg and SeO 2 The mixed steam and roasting slag, the total content of mercury and selenium in the roasting slag does not exceed 1%, and the roasting slag is used for recovery of valuable metals in pyrometallurgy; the flow rate of air is 1L / min;

[0028] (3) Mercury recovery...

Embodiment 2

[0032] Embodiment 2: the method (see figure 1 ),Specific steps are as follows:

[0033] (1) Slurry: mix the acid mud with the slurry liquid and slurry at a temperature of 60°C for 60 minutes to obtain a slurry; wherein the mass content of mercury in the dried acid mud is 43%, the mass content of selenium is 8%, and the acid mud The solid-liquid ratio g:mL with the slurrying liquid is 2:1, sulfuric acid and oxidant (hydrogen peroxide) are contained in the slurrying liquid, the concentration of sulfuric acid in the slurrying liquid is 90g / L, and the concentration of oxidant in the slurrying liquid is 35g / L;

[0034] (2) Roasting: put the slurry in step (1) at a temperature of 600°C and microwave in an air atmosphere for 60 minutes to obtain Hg and SeO 2 The mixed steam and roasting slag, the total content of mercury and selenium in the roasting slag does not exceed 1%, and the roasting slag is used for recovery of valuable metals in pyrometallurgy; the flow rate of air is 10L / m...

Embodiment 3

[0038] Embodiment 3: the method (see figure 1 ),Specific steps are as follows:

[0039](1) Slurry: mix the acid mud with the slurry liquid and slurry at a temperature of 90°C for 100 minutes to obtain a slurry; wherein the mass content of mercury in the dried acid mud is 9%, the mass content of selenium is 71%, and the acid mud The solid-to-liquid ratio g:mL of the slurry is 6:1, the slurry contains nitric acid and oxidant (hypochlorous acid), the concentration of nitric acid in the slurry is 200g / L, and the concentration of oxidant in the slurry is 100g / L L;

[0040] (2) Roasting: Put the slurry in step (1) at a temperature of 800°C and microwave in an air atmosphere for 120 minutes to obtain Hg and SeO 2 The mixed steam and roasting slag, the total content of mercury and selenium in the roasting slag does not exceed 1%, and the roasting slag is used for recovery of valuable metals in pyrometallurgy; the flow rate of air is 10L / min;

[0041] (3) Mercury recovery by condens...

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Abstract

The invention relates to a method for separating and recovering selenium and mercury in acid mud through a one-step method, and belongs to the technical field of acid mud treatment. The method comprises the following steps: mixing and slurrying are carried out on acid mud and slurrying liquid for 30-120 minutes to obtain slurry; wherein the slurrying liquid contains acid liquid and an oxidizing agent; the slurry is subjected to microwave roasting for 20-120 min at the temperature of 400-800 DEG C, mixed steam of Hg and SeO2 and roasting slag are obtained, and valuable metal recycling is conducted on the roasting slag; the mixed steam of the Hg and the SeO2 is condensed to separate out crude SeO2 steam and an Hg elementary substance; and the crude SeO2 steam is introduced into an absorption tower for hydrolysis to obtain H2SeO3, SO2 flue gas is introduced for reduction of H2SeO3 to obtain crude selenium, and the crude selenium is dried and refined to obtain refined selenium. According to the method, selenium and mercury phases in the acid mud are directly roasted into SeO2 and mercury, mercury is condensed and recycled, selenium dioxide is reduced and recycled, refining is carried out, mercury-containing residues and selenium-containing residues generated in the process are refined again, and therefore efficient and simple treatment of harmful acid mud is achieved.

Description

technical field [0001] The invention relates to a one-step method for separating and recovering selenium and mercury in acid mud, belonging to the technical field of acid mud treatment. Background technique [0002] The control of mercury and selenium pollution has become one of the main issues in the field of global environmental science and technology. The advanced treatment of valuable smelting resources containing mercury and selenium has become a challenge in the field of mercury pollution control. Research and development to efficiently remove mercury and selenium in valuable smelting resources has become an urgent need to ensure the safety of the ecological environment. [0003] In the prior art, the method for separating selenium, mercury and lead from acid mud by chlorination leaching is to first add sodium chlorate to oxidize and leach mercury and selenium, and then pass through SO 2 Reducing crude selenium and adding sodium sulfide to precipitate mercury can clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B43/00C01B19/02C01B19/04
CPCC22B7/004C22B7/007C22B1/02C22B43/00C01B19/02C01B19/004Y02P10/20
Inventor 张利波杨坤洪岩潘锡剑
Owner KUNMING UNIV OF SCI & TECH
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