Treatment method for smelting waste water containing sulfuric acid and heavy metal

A treatment method and technology for heavy metals, applied in metallurgical wastewater treatment, neutralized water/sewage treatment, multi-stage water treatment, etc., can solve problems such as difficult to achieve successfully, and achieve lower treatment costs, less sludge, and less pollution to the environment. the effect of risk

Inactive Publication Date: 2015-02-25
GUANGZHOU LANTAO WATER TREATMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high boiling point of sulfuric acid, which forms an azeotrope with water, it will be difficult to successfully achieve

Method used

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  • Treatment method for smelting waste water containing sulfuric acid and heavy metal
  • Treatment method for smelting waste water containing sulfuric acid and heavy metal
  • Treatment method for smelting waste water containing sulfuric acid and heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment one: use MMP adsorbent to process sulfuric acid and heavy metal smelting wastewater: (1) source of wastewater: copper smelting and zinc smelting wastewater of a certain smelter in Yunnan; experimental method: prepare 2 2-liter beakers, add 1500 ml of Copper smelting or zinc smelting wastewater, and then add MMP adsorbent respectively, the amount added is the ratio of solid content of adsorbent to sulfuric acid content 3:1. Stir for 5 minutes, check the pH, if the pH does not reach 5.5, continue to add the adsorbent until the pH reaches 5.5. Then use a suction filter bottle to filter it. The adsorbent cake and filtrate were collected separately. When collecting the adsorbent filter cake, use 15 ml of tap water to wash as much of the adsorbent particles remaining on the filter paper as possible and pour it into the adsorbent collection. The filtrate was sampled and tested for pH, sulfate, arsenate, and heavy metals such as copper, zinc, and cadmium. The resul...

Embodiment 2

[0035] Embodiment two: prepare 2 2 liters of beakers, get 1200 milliliters in the beakers respectively from two kinds of waste water filtrates collected in the experiment of embodiment one, be its pH with milk of lime of 5% with calcium hydroxide concentration respectively Adjust to 9, fully stir for 5 minutes, then add a small amount of polyacrylamide (PAM) to a concentration of 5ppm, filter with an ultrafiltration bottle and collect the filtrate, and then take samples from the filtrate to test, pH, sulfuric acid root, arsenate, and heavy metals such as copper, zinc, and cadmium. The results are shown in Table 2.

[0036] Table 2 shows the changes in the contents of sulfuric acid, arsenic acid and heavy metals in wastewater after chemical coagulation and precipitation on the basis of adsorption.

[0037]

Embodiment 3

[0038] Embodiment three: prepare 2 beakers of 1000 milliliters, get 1000 milliliters in the beaker respectively from the filtrate of two kinds of waste waters that collect in the experiment of embodiment two, by the ratio of 1:1000, the adsorption that content is 20% The agent was added to 2 beakers and stirred for 2 minutes, then added to such as figure 1 A simulated setup of the heavy metal purifier is shown. Collect clean water from the clean water outlet and take samples to test the pH, sulfate, arsenate, and heavy metals such as copper, zinc, and cadmium. The results are shown in Table 3.

[0039] Table 3 is the change of sulfuric acid, arsenic acid and heavy metal content in wastewater after heavy metal purification treatment on the basis of adsorption and coagulation precipitation.

[0040]

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Abstract

The invention discloses a treatment method for smelting waste water containing sulfuric acid and heavy metal. The treatment method includes the specific steps: (1) performing adsorption reaction by means of adding appropriate adsorbent, used for adsorbing sulfate radical in the waste water, into the waste water; (2) performing solid-liquid separation by means of subjecting the water water after adsorption reaction to precipitation or filtration prior to solid-liquid separation; (3) for chemical precipitation, subjecting supernate or filtrate obtained by solid-liquid separation to chemical coagulative precipitation; (4) removing the heavy metal, using a heavy metal filter for treating the supernate obtained after chemical coagulative precipitation, and completely removing the residual heavy metal. The method has the advantages that water water discharge is up to standards, sludge is little, treatment cost is low, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to a treatment method for smelting wastewater containing sulfuric acid and heavy metals. Background technique [0002] The smelting industry is a high-pollution risk industry. A large amount of sewage is often generated during the beneficiation and smelting process. The more complicated and difficult to treat is the wastewater containing sulfuric acid and various heavy metals. In addition to sulfuric acid, this wastewater also contains arsenate; in addition, it contains heavy metals such as copper, zinc, and cadmium. At present, there is no effective and reliable technology that can completely treat this kind of sewage. Most of the methods are mainly based on the chemical precipitation method, which is to adjust the pH of the wastewater to alkaline to allow heavy metals to precipitate, and at the same time form calcium sulfate precipitation through the replacement of calcium ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/001C02F1/281C02F1/288C02F1/52C02F1/56C02F1/66C02F3/342C02F2101/101C02F2101/103C02F2101/20C02F2103/16C02F2301/08
Inventor 蔡亲荫
Owner GUANGZHOU LANTAO WATER TREATMENT CO LTD
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