Method for microwave low-temperature treatment of acid mud and synchronous recovery of selenium and mercury

A technology for low-temperature treatment and recovery of selenium, applied in the field of environmental resource utilization, can solve the problems of small mercurous chloride market, long process flow, high energy consumption, etc., and achieve great environmental and economic benefits, high purity, and low energy consumption Effect

Active Publication Date: 2020-04-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wet precipitation process has only been successfully applied in an environmental protection company in Yunnan. The process includes HCl+NaClO oxidation-Na 2 SO 3 Reduction of selenium-water and hydrazine reduction to get mercurous chloride, although the recovery rate of selenium mercury is high, but the process is long, the cost is high, and the market for mercurous chloride is small
The f

Method used

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  • Method for microwave low-temperature treatment of acid mud and synchronous recovery of selenium and mercury
  • Method for microwave low-temperature treatment of acid mud and synchronous recovery of selenium and mercury

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Such as figure 1 Shown, this microwave low-temperature treatment acid mud synchronously reclaims the method for selenium mercury, and it comprises the following steps:

[0021] Step 1. Acid mud (the source of acid mud includes copper acid mud, the main components include: valuable components of lead, zinc and copper, selenium-containing components and mercury-containing components, the acid mud XRD diagram is as follows figure 2 As shown, the phases in which mercury exists include HgO, HgS, HgSO 4 and HgSe, the phases of selenium include HgSe, the content of Hg in the acid mud is 1wt%, and the content of Se is 50wt%) using microwave roasting and distillation to 300°C, keeping it for 5min to obtain selenium mercury vapor and valuable components;

[0022] Step 2, pass the selenium mercury vapor obtained in step 1 into dilute acid (dilute sulfuric acid, dilute acid concentration is 5wt%), the crude mercury enrichment time is 5min, obtain crude mercury precipitation and s...

Embodiment 2

[0026] Such as figure 1 Shown, this microwave low-temperature treatment acid mud synchronously reclaims the method for selenium mercury, and it comprises the following steps:

[0027] Step 1. Acid mud (the source of acid mud includes lead-acid mud, the main components include: valuable components of lead, zinc and copper, selenium-containing components and mercury-containing components, wherein the phases of mercury include HgO, HgS, HgSO 4 and HgSe, the phases of selenium include HgSe, the content of Hg in the acid mud is 25wt%, and the content of Se is 25wt%) using microwave roasting and distillation to 450°C, holding for 30min to obtain selenium mercury vapor and valuable components;

[0028] Step 2, pass the selenium mercury vapor obtained in step 1 into dilute acid (dilute sulfuric acid, dilute acid concentration is 15wt%), the crude mercury enrichment time is 30min, obtain crude mercury precipitation and selenic acid solution;

[0029] Step 3, reducing the selenic acid ...

Embodiment 3

[0032] Such as figure 1 Shown, this microwave low-temperature treatment acid mud synchronously reclaims the method for selenium mercury, and it comprises the following steps:

[0033] Step 1. Acid mud (the source of acid mud includes zinc acid mud, the main components include: valuable components of lead, zinc and copper, selenium-containing components and mercury-containing components, wherein the phases of mercury include HgO, HgS, HgSO 4 and HgSe, the phases of selenium include HgSe, the content of Hg in the acid mud is 50wt%, and the content of Se is 1wt%) using microwave roasting and distillation to 600°C, holding for 60min to obtain selenium mercury vapor and valuable components;

[0034] Step 2, pass the selenium mercury vapor obtained in step 1 into dilute acid (dilute nitric acid, dilute acid concentration is 20wt%), the crude mercury enrichment time is 60min, obtain crude mercury precipitation and selenic acid solution;

[0035] Step 3, the selenic acid solution tha...

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Abstract

The invention relates to a method for microwave low-temperature treatment of acid mud and synchronous recovery of selenium and mercury, belonging to the technical field of environmental resource utilization. The method comprises the following steps: roasting and distilling acid mud to 300-600 DEG C by adopting microwaves, and carrying out heat preservation for 5-60 minutes to obtain selenium-mercury steam and valuable components; introducing the obtained selenium-mercury vapor into dilute acid to obtain a crude mercury precipitate and a selenic acid solution; and reducing the obtained selenicacid solution to obtain crude selenium, and returning the residual dilute acid solution to a dilute acid process. The method of the invention is a novel process for efficiently and deeply removing mercury from acid mud, and can realize low-temperature synchronous recovery of selenium.

Description

technical field [0001] The invention relates to a method for synchronously recovering selenium and mercury by microwave low-temperature treatment of acid mud, and belongs to the technical field of environmental resource utilization. Background technique [0002] At present, the domestic copper, lead and zinc non-ferrous smelting industry is mainly based on pyrotechnics, so a large amount of acid mud will be produced. The main phases in acid mud include lead (zinc, copper) valuable components, selenium-containing compounds, mercury-containing compounds and gangue components (CaCO 3 , SiO 2 ), which are hazardous wastes. There are two industrial treatment processes for acid mud: wet precipitation process and fire distillation process. The wet precipitation process has only been successfully applied in an environmental protection company in Yunnan. The process includes HCl+NaClO oxidation-Na 2 SO 3 Reduction of selenium-water and hydrazine reduction to get mercurous chlori...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01B19/02C22B1/02C22B43/00
CPCC22B7/006C22B1/02C22B43/00C01B19/02Y02P10/20
Inventor 张利波杨坤曾翰林洪岩梁明
Owner KUNMING UNIV OF SCI & TECH
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