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Process for removing thallium from thallium-containing heavy metal wastewater through neutralization and flocculation

A technology for heavy metals and heavy metal ions, applied in the fields of neutralizing water/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problem of high chromaticity of wastewater, and achieve the effect of good application prospects

Inactive Publication Date: 2015-03-25
ZHUZHOU SMELTER GRP
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Problems solved by technology

The color of wastewater treated by this method is relatively high, and it is not suitable for high-concentration thallium-containing wastewater

Method used

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  • Process for removing thallium from thallium-containing heavy metal wastewater through neutralization and flocculation

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Embodiment Construction

[0019] A process for neutralizing and coagulating thallium-containing heavy metal wastewater, which is characterized in that the thallium-containing heavy metal wastewater is used as the treatment object, and the secondary treatment of the wastewater ensures that thallium and heavy metal elements are discharged up to the standard. Its specific process includes:

[0020] 1) The primary treatment part includes: adding one or more of lime milk, sodium hydroxide or limestone to the first reaction tank for heavy metal wastewater containing thallium, adjusting the pH to 9-11, so that the Tl 3+ with OH - Forms insoluble Tl(OH) 3 ,OH - Form hydroxide precipitation with most heavy metal ions under alkaline conditions; add one or more high-efficiency flocculants among aluminum sulfate, polyaluminum chloride, and polyaluminum sulfate in the second reaction tank to promote hydroxide precipitation Form larger alum flowers; add one or more of sodium sulfide, ammonia sulfide, potassium su...

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Abstract

The invention discloses a process for removing thallium from thallium-containing heavy metal wastewater through neutralization and flocculation. The process comprises the following steps: performing primary treatment, namely adjusting the pH value of thallium-containing heavy metal wastewater to be more than 7through acid and alkali, adding an efficient coagulant, sulfide and a flocculant, and performing solid-liquid separation through a slanting board sedimentation pool; performing secondary treatment, namely adding sulfide, diatomite and the flocculant into supernatant purified water after primary treatment, and performing solid-liquid separation through the slanting board sedimentation pool; adjusting the purified water subjected to secondary treatment to be neutral, adding iron salt, and finally filtering through a filter and directly discharging to the outside. Due to the adoption of the technical scheme, the removal rate of thallium and other heavy metal ions in the heavy metal wastewater can be effectively increased, the environmental pollution can be avoided, and the medicament cost can be reduced.

Description

technical field [0001] The invention relates to a treatment method for heavy metal wastewater containing thallium, in particular to a wastewater containing one or more heavy metals such as cadmium, arsenic, lead, zinc, copper, thallium, etc. produced in mining, beneficiation, smelting, processing and other processes in the non-ferrous industry Processing technology. Background technique [0002] The rapid development of industrialization has caused a large amount of heavy metal wastewater to be discharged into the environment. The acidic heavy metal wastewater has a low pH (pH value between 4-6) and contains various heavy metal ions, such as Cu 2+ 、Cd 2+ , Pb 2+ , Zn 2+ , Hg 2+ , Tl + , Tl 2+ etc., they cannot be decomposed by organisms, and once they enter the environment, they will continue to accumulate in the environment, causing serious pollution to water bodies and even destroying the ecological environment. [0003] Thallium (Tl) is a rare dispersed metal and i...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/281C02F1/5236C02F1/56C02F1/66C02F2101/20
Inventor 李迪汉彭黎胜张天芳伏东才林文军熊智姜晴
Owner ZHUZHOU SMELTER GRP
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