Technology for removing thallium with lead and zinc smelting flue gas washing waste acid water

A technology for polluted acid wastewater and smelting flue gas, which is applied in gaseous discharge wastewater treatment, water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as complex processes and achieve good application prospects.

Inactive Publication Date: 2015-03-25
ZHUZHOU SMELTER GRP
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  • Description
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  • Application Information

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Problems solved by technology

The process is complex and not suitable for the treatment of lead-zinc smelting flue gas washing sewage acid wastewater

Method used

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  • Technology for removing thallium with lead and zinc smelting flue gas washing waste acid water

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Embodiment Construction

[0020] The invention provides a treatment process for washing dirty acid waste water with flue gas from lead-zinc smelting. The technological process is to settle the flue gas washing dirty acid waste water into the homogenization tank, and then add the prepared vulcanizing agent from the pipe connecting the supernatant of the homogenization tank to the vulcanization reaction tank, so that the vulcanizing agent and the dirty acid can be fully and evenly mixed and reacted. The amount of vulcanizing agent used is 5-10 times the amount calculated by the chemical reaction formula of the mercury content in the polluted acid. Mercury removal is continued in the vulcanization reaction pool, and the reaction time is controlled to be no less than 1 hour.

[0021] After mercury removal, the polluted acid wastewater and the bottom flow filtrate after mercury removal enter the primary treatment part, and the pH value is adjusted to about 9 through calcium carbide mud, so that the Tl 3+ wi...

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Abstract

The invention discloses a technology for removing thallium with lead and zinc smelting flue gas washing waste acid water. The technology comprises the steps of settling the flue gas washing waste acid water in an equalizing tank, adding sulfide into the equalized waste acid water to remove most mercury, then carrying out primary treatment, regulating a pH (potential of hydrogen) value of the waste acid water after mercury is removed, adding sulfide and a flocculant in sequence for press filtration, then carrying out secondary treatment, regulating the pH value of primary supernatant purified water to 11, adding sulfide and the flocculant in sequence, and removing thallium and heavy metal ions in depth via inclined plate settling. After the technology is employed, a thallium content in the lead and zinc smelting flue gas washing waste acid water is decreased to be less than or equal to 0.000005g / L, and the technology for removing the thallium is effective and strong in industrial applicability.

Description

technical field [0001] The invention relates to the field of lead-zinc smelting flue gas washing sewage acid wastewater treatment, specifically a lead-zinc smelting flue gas washing sewage containing one or more heavy metals such as thallium and cadmium, arsenic, mercury, lead, zinc, copper, etc. Acid treatment process. Background technique [0002] The waste acid treatment of lead-zinc smelting flue gas washing has always been a major problem in this industry, mainly because the waste water contains high acid content and more harmful heavy metal ions such as thallium, mercury, and arsenic. At present, there are few thallium removal processes that are applicable to the treatment of large amounts of wastewater in the lead-zinc smelting industry, and the thallium removal process in the lead-zinc smelting flue gas washing sewage acid is even blank in China. [0003] Thallium (Tl) is a rare dispersed metal and is a highly toxic heavy metal pollutant. Thallium poisoning can caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/18
CPCC02F9/00C02F1/56C02F1/62C02F1/66C02F2101/20C02F2103/18
Inventor 张天芳文杰李云新林文军伏东才李迪汉
Owner ZHUZHOU SMELTER GRP
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