Method for comprehensively utilizing residual tailings after extracting precious metals from acid pickling sludge

A technology for pickling sludge and precious metals, applied in the directions of non-metallic elements, chemical instruments and methods, sulfur compounds, etc., can solve the problems of living environment hazards, dangerous solid waste of tailings, cure the symptoms but not the root cause, and achieve environmental protection, reduce The effect of tailings discharge and simple operation process

Inactive Publication Date: 2014-04-16
王洪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the output of pickling sludge in Anhua City, Taizhou, Jiangsu Province exceeded 800,000 tons in 2012. Pickling sludge contains a large amount of heavy metals and harmful elements. The main treatment method is landfill, and most of them are piled up in landfills , this method treats the symptoms but not the root cause, not only takes up a lot of land, but also seriously pollutes the environment, which brings great harm to the living environment of human beings
[0003] In recent years, the country has gradually put forward new requirements for the treatment of pickling sludge. Many universities and enterprises have simultaneously developed a variety of methods for recovering precious metals in pickling sludge. Among the methods of recycling precious metals, there is pyrometallurgy Different from hydrometallurgy, the recovery rate of pyrometallurgy is higher, but due to the bottleneck constraints of energy consumption and environmental pollution, this method is controlled. Although hydrometallurgy has the advantage of lower energy consumption, this kind of The tailings treated by the method belong to hazardous solid waste
The current effective solution is to use tailings to make bricks or cement, and stabilize heavy metals through vitrification or lattice distortion. Cement plants are no longer allowed to exist, which makes it difficult to effectively use the remaining tailings after the extraction of precious metals from pickling sludge

Method used

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  • Method for comprehensively utilizing residual tailings after extracting precious metals from acid pickling sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention comprehensively utilizes the method for remaining tailings after pickling sludge is extracted precious metal, and its steps are:

[0029] (1) Crushing: Pour the tailings into the crusher for crushing to 8 meshes; the tailings components are: Si 16.3%, Fe 15.1%, Ca 3.0%, Al 4.7%, Mg 4.8%, S 5.8%, Ni 0.72%, H 2 O 2.3%;

[0030] (2) Batching, briquetting and drying: Batch the crushed tailings and carbon powder, and mix them evenly in a large mixer, then briquette them with a briquetting machine, and then put them into a dryer at a temperature of 150°C Under drying, tailings pellets are obtained, the size of the pellets is ?20-30mm; the mass ratio of tailings and carbon powder ingredients is 4:1;

[0031] (3) Roasting: put the tailings pellets into the rotary kiln for roasting, and obtain SO after roasting 2 Smoke gas and slag; the roasting temperature is 800°C, and the roasting time is 60 minutes; after the roasting is completed, without opening th...

Embodiment 2

[0039] The present invention comprehensively utilizes the method for remaining tailings after pickling sludge is extracted precious metal, and its steps are:

[0040] (1) Crushing: Pour the tailings into the crusher for crushing to 9 meshes; the tailings components are: Si 14.3%, Fe 8.7%, Ca4.7%, Al 5.6%, Mg 7.1%, S 4.7%, Ni 0.64%, H 2 O 2.7%;

[0041] (2) Batching, briquetting and drying: Batch the crushed tailings and carbon powder, and mix them evenly in a large mixer, then briquette them with a briquetting machine, and then put them into a dryer at a temperature of 150°C Under drying, tailings pellets are obtained, the size of the pellets is ?20-30mm; the mass ratio of tailings and carbon powder ingredients is 4.5:1;

[0042] (3) Roasting: put the tailings pellets into the rotary kiln for roasting, and obtain SO after roasting 2 Smoke gas and slag; the roasting temperature is 850°C and the roasting time is 75min. After the roasting is completed, without opening the doo...

Embodiment 3

[0050] The present invention comprehensively utilizes the method for remaining tailings after pickling sludge is extracted precious metal, and its steps are:

[0051] (1) Crushing: Pour the tailings into the jaw crusher for crushing to 10 meshes; the composition of the tailings is: Si 15.6%, Fe 8.3%, Ca5.2%, Al 6.1%, Mg 4.3%, S 4.2 %, Ni 0.74%, H 2 O 2.0%;

[0052] (2) Batching, briquetting and drying: Batch the crushed tailings and carbon powder, and mix them evenly in a large mixer, then briquette them with a briquetting machine, and then put them into a dryer at a temperature of 150°C Under drying, tailings pellets are obtained, the size of the pellets is ?20-30mm; the mass ratio of tailings and carbon powder ingredients is 5:1;

[0053] (3) Roasting: put the tailings pellets into the rotary kiln for roasting, and obtain SO after roasting 2 Smoke gas and slag; the roasting temperature is 900°C, and the roasting time is 90 minutes; after the roasting is completed, without...

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Abstract

The invention particularly relates to a method for comprehensively utilizing residual tailings after extracting precious metals from acid pickling sludge. The method is suitable for processing the residual tailings after recycling the precious metals from the acid pickling sludge through an acid leaching method. The method disclosed by the invention has the advantages that the residual tailings after extracting the precious metals from the acid pickling sludge can be comprehensively recycled to be prepared into powdered iron, rock wool products and sulfuric acid, so that the economic value is effectively realized; the method is simple in operation process, popular in raw material, low in production cost and remarkable in economic effect; the residual tailings are effectively and comprehensively utilized by means of the method disclosed by the invention, so that the discharge of the tailings is reduced, the land is saved and the environment is effectively protected.

Description

technical field [0001] The invention specifically relates to a method for comprehensively utilizing pickling sludge to extract the remaining tailings after precious metals, which is suitable for treating the remaining tailings after pickling sludge recovers precious metals through an acid leaching method. Background technique [0002] my country is a large country producing stainless steel, with an annual output of more than 20 million tons. A large amount of stainless steel products are produced every year. The processing process is accompanied by a large amount of pickling sludge. For example, the output of pickling sludge in Anhua City, Taizhou, Jiangsu Province exceeded 800,000 tons in 2012. Pickling sludge contains a large amount of heavy metals and harmful elements. The main treatment method is landfill, and most of them are piled up in landfills , This method treats the symptoms but not the root cause, not only takes up a lot of land, but also seriously pollutes the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B1/216C22B7/00C22B11/00C03C13/06C01B17/74B03C1/02
CPCY02P10/20
Inventor 王洪胡炳堂周海涛
Owner 王洪
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