Method for production and recovery of precious metals on the basis of pickling sludge

A technology for pickling sludge and precious metals, which is applied to the removal of copper sulfate, nickel sulfate, and solid waste. It can solve the problems of small and impossible pickling sludge reduction, harmlessness and resource utilization, and achieve Reduce energy consumption, reduce the chance of secondary pollution, and achieve zero emissions

Inactive Publication Date: 2015-07-08
JIANGSU HENGJIA RENEWABLE RESOURCES
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Problems solved by technology

[0004] To sum up, the recycling of pickling sludge treatment has always been the focus of research at home and abroad. A lot of research has been carried out and some achievements have been made, but so far there are not many industrialized ones. Solidified pit burial is the most common. Fundamentally realize the reduction, harmlessness and resource utilization of pickling sludge. Among the resource utilization schemes that have been proposed, only leaching method, incineration recovery method and materialization technology are more feasible. High efficiency, incineration and recycling can effectively realize sludge reduction and harmlessness

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  • Method for production and recovery of precious metals on the basis of pickling sludge

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Embodiment

[0027] A kind of method based on pickling sludge production recovery precious metal as shown in Figure 1, comprises the following steps,

[0028]Step 1. Pulverize the pickling sludge with a pulverizer, and then perform leaching treatment. Add sulfuric acid with a pH value of 1.5-2.5 to the pulverized raw material, heat with steam, and stir while heating. The leaching time is 4-8 hours. Wherein, the leached residue is filtered by a filter press, and the filtrate enters the next process step. Step 2, iron removal press filtration, first oxidize ferric oxide to ferric iron in an oxidant hydrogen peroxide solution with a pH value of 3.0-3.5 and a temperature of 25°C, and then add sodium sulfate with a pH value of 3.0-3.5 The oxidant hydrogen peroxide solution is used to precipitate and separate the complexes of Fe3+ and Na+, and the mother liquor enters the next process step through pressure filtration. Step 3, one-time impurity removal, the filtrate after iron removal is filtere...

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Abstract

The invention belongs to the pickling sludge recovery technical field, and specifically discloses a method for production and recovery of precious metals on the basis of pickling sludge, and the method includes crushing, press-filtering, first impurity removal, secondary impurity removal, nickel sulfate crystallization, rock wool preparation and flue gas dust removal step. The beneficial effects of the method for production and recovery of the precious metals on the basis of pickling sludge are that: precious metals in the pickling sludge can be recovered by high-pressured acid leaching, after the recovery, waste residue is comprehensively treated to produce iron alloy and rock wool products, SO2 in the exhaust gas produced in a reduction melting furnace can be recovered to produce sulfuric acid, compared with a traditional wet method, all available metals can be extracted from waste, secondary pollution probability is reduced, energy consumption is reduced, and zero discharge of industrial wastewater can be achieved.

Description

technical field [0001] The invention belongs to the technical field of pickling sludge recovery and application, and in particular relates to a method for producing and recycling precious metals based on pickling sludge. Background technique [0002] At present, there is no economical and technical parallel treatment method for pickling sludge. The method commonly used at home and abroad is solid landfill method, and pickling sludge contains a large amount of heavy metals. Landfilling of pickling sludge Before treatment, it must be solidified and stabilized. The commonly used curing agents are cement, asphalt, glass, water glass, etc. Among them, cement is one of the most common curing agents. Cement curing refers to mixing waste with ordinary cement to form A solidified body with a certain strength, so as to achieve the purpose of reducing the leaching rate of hazardous components in the waste. Although the cement solidification method is widely used, it has the disadvantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00B09B3/00C01G3/10C03B37/00C01G53/10C01G53/04
Inventor 徐荣文王年青周扬
Owner JIANGSU HENGJIA RENEWABLE RESOURCES
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