A method for separating heavy metal sulfide precipitates using multiple parallel field flows
A heavy metal precipitation and parallel field technology, applied in chemical instruments and methods, precipitation treatment, metallurgical wastewater treatment, etc., can solve problems such as difficulties, fine sulfide precipitation particles, etc., and achieve the effect of recycling and reducing the amount of slag
Active Publication Date: 2021-09-21
CENT SOUTH UNIV
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Problems solved by technology
[0003] In order to solve the problem that solid-liquid and solid-solid separation is difficult due to the fine sulfide precipitation particles produced in the existing heavy metal wastewater sulfide precipitation process, the purpose of the present invention is to propose a method for separating sulfide heavy metal precipitation using multiple parallel field flows , to carry out selective vulcanization under specific pH conditions, strictly control the production of a single metal sulfide within a specific particle size range, and then use multiple parallel field flow separation tanks to efficiently realize the fine metal sulfide precipitation produced during the sulfide precipitation process Separation and recovery of heavy metal sulfide precipitation, such a cycle until the separation and recovery of heavy metal sulfide precipitation, solves the difficult problem of solid-liquid and solid-solid separation, so as to realize the recovery of valuable metals and reduce the generation of slag
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Embodiment 1
[0030] The heavy metal wastewater used in this embodiment is the sewage acid wastewater of a copper smelter, and its main components are shown in Table 1:
[0031] Table 1 Composition of sewage acid wastewater from a copper smelter
[0032]
[0033] A method for separating heavy metal sulfide precipitation using multiple parallel field flows, specifically comprising the following steps:
[0034] (1) Pass the polluted acid wastewater containing Cu(II), Zn(II) and As(III) into the adjustment tank, add sodium hydroxide or sulfuric acid solution into the adjustment tank to adjust the pH value to 1, which is the precipitation of zinc sulfide Formation and control of zinc sulfide precipitation particle size provide specific acidic conditions;
[0035] (2) The dirty acid wastewater containing Cu(II), Zn(II) and As(III) with a pH value of 1 obtained in step (1) is pumped into the aerated fluidized bed reactor through a lift pump, device will H 2 S gas is passed into the reactor,...
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Abstract
The invention discloses a method for separating sulfide heavy metal precipitation by using multiple parallel field flows. Selective sulfide is carried out under specific pH conditions to strictly control the generation of single metal sulfide within a specific particle size range, and then multiple parallel field flows are used to The separation tank efficiently realizes the separation and recovery of the fine metal sulfide precipitates produced in the process of sulfide precipitation, and this cycle is completed until the separation and recovery of each heavy metal sulfide precipitate is completed, which solves the difficult problem of solid-liquid and solid-solid separation, thereby achieving effective The recovery of valence metals reduces the generation of slag.
Description
technical field [0001] The invention belongs to the field of heavy metal sewage treatment, and more specifically relates to a method for separating sulfide heavy metal precipitation by using multiple parallel field flows. Background technique [0002] During the metal smelting process, a large amount of dirty acid wastewater containing heavy metal ions will be produced. In recent years, with the improvement of environmental protection requirements, more stringent requirements have been put forward for the discharge of heavy metal sewage and solid waste. In the traditional heavy metal wastewater sulfide precipitation treatment process, sodium sulfide reagents are generally used for precipitation to remove heavy metal ions such as copper, arsenic, and zinc in wastewater, which can meet the basic requirements of wastewater discharge standards. However, this one-time vulcanization method focuses on the discharge of heavy metals in wastewater up to the standard, and pays little ...
Claims
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IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F1/5236C02F1/66C02F9/00C02F2001/007C02F2101/20C02F2103/16
Inventor 曾伟志郭文香晏阳李垦李博胡辉
Owner CENT SOUTH UNIV