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Method for recycling silver in high oil-bearing sludge

A technology of sludge and Zhongyin, which is applied in the field of recycling high oily sludge Zhongyin, can solve the problems of enterprise loss, long selling time, recycling, etc., and achieve the effects of reducing economic losses, improving turnover rate and high recovery rate

Inactive Publication Date: 2017-05-24
WENZHOU LONGSUN ELECTRICAL ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This viscous sludge cannot be recovered by conventional methods
At present, most enterprises choose to sell the settled and collected silt to recycling plants. However, due to the long period of time for collecting and selling the silt, it is not conducive to the turnover of recycled silver, and because of the uncertainty of the overall value of the silt, it often brings a negative impact on the enterprise. to lose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1. Degreasing: Take 100kg of highly oily sludge and put it in a reaction kettle, add 50kg of industrial alcohol, stir until there is no agglomeration, ventilate during the stirring process, filter until dry with a plate and frame suction filter, and repeat cleaning 2 times Finally, drying, weighing to get degreasing sludge;

[0022] Step 2. Reduction: Pour the weighed oil-removed sludge back into the reaction kettle, add 50kg of pickling wastewater from the workshop, heat up to 70°C under stirring, ventilate during the stirring process, slowly add 20kg of atomized iron powder, and continue stirring for 2 hours , filtered with a plate and frame suction filter until dry, washed with water until neutral;

[0023] Step 3. Oxidation and dissolution: Pour the sludge back into the reaction kettle again, add 100kg of nitric acid, heat and stir at 80°C for 2 hours, filter with suction after cooling, collect the filtrate, rinse the residue with distilled water 3 times, dry, ...

Embodiment 2

[0029] Step 1. Degreasing: Take 100kg of sludge and put it in the reaction kettle, add 50kg of acetone, stir until there is no agglomeration, ventilate during the stirring process, use a plate and frame suction filter to dry, wash with distilled water for 3 times, and bake dry, weighed to obtain degreasing sludge;

[0030] Step 2. Reduction: Pour the weighed oil-removed sludge back into the reaction kettle, add 50kg of pickling wastewater from the workshop, heat up to 70°C under stirring, perform ventilation during the stirring process, slowly add 20kg of zinc powder, continue stirring for 2 hours, and use Filter with plate and frame suction filter until dry, wash with water until neutral;

[0031] Step 3. Oxidation and dissolution: Pour the sludge back into the reaction kettle again, add 100kg of nitric acid, heat and stir at 80°C for 2 hours, filter with suction after cooling, collect the filtrate, rinse the residue with distilled water 3 times, dry, and weigh;

[0032] Ste...

Embodiment 3

[0037] Step 1. Degreasing: Take 100kg of sludge and put it in a reaction kettle, add 50kg of acetonitrile, stir until there is no agglomeration, ventilate during the stirring process, filter until dry with a plate and frame suction filter, wash with distilled water for 3 times, and bake dry, weighed to obtain degreasing sludge;

[0038] Step 2. Reduction: Pour the weighed oil-removed sludge back into the reaction kettle, add 50kg of pickling wastewater from the workshop, heat up to 70°C under stirring, perform ventilation during the stirring process, slowly add 20kg of zinc powder, continue stirring for 2 hours, and use Filter with plate and frame suction filter until dry, wash with water until neutral;

[0039] Step 3. Oxidation and dissolution: Pour the sludge back into the reaction kettle again, add 100kg of nitric acid (1+1), keep stirring at 80°C for 2 hours, suction filter after cooling, collect the filtrate, rinse the residue with distilled water 3 times, dry and weigh ...

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PUM

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Abstract

The invention discloses a method for recycling silver in high oil-bearing sludge. The steps of oil removing, reducing, oxidizing and reducing again are adopted. Because oils, elemental silver, combined silver and the like are contained in the sludge, the oils in the high oil-bearing sludge are removed firstly to reduce the stickiness of the high oil-bearing sludge, then, a reducing agent is used for reducing the combined silver to the elemental silver, the elemental silver in the sludge is oxidized and dissolved into silver ions to enter a solution through strong acid, and drawing and filtering are conducted to obtain a silver ion containing filtrate. Finally, the silver ions are deposited from the filtrate to obtain silver chloride, and the silver chloride is reduced through the reducing agent to obtain silver powder. According to the technical scheme, the higher recycling rate can be achieved, and 97% of the silver in the high oil-bearing sludge can be recycled to obtain the silver powder with the purity being 99.8%, and therefore, the turnover rate of the silver in the sludge is improved and the economical loss caused by the cheap sale of the sludge is reduced.

Description

technical field [0001] The invention relates to the technical field of precious metal silver recovery, in particular to a method for recovering silver from high oily sludge. Background technique [0002] Silver is a commonly used precious metal, and it is used in a large amount in the electrical alloy industry. It is used in the production of various low-voltage electrical contacts every year, with thousands of tons of silver metal. From raw materials to finished products, each process has a high or low yield of materials at one time, so various silver-containing scraps will inevitably be produced. The quantity of such scraps is huge, and there are many recycling methods, most of which are relatively simple, so most processing enterprises have relatively comprehensive recycling processes. But in addition, various ground ash, debris, and a small amount of silver are discharged into the waste water pool along with the waste water during the milling and post-treatment process,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00B22F9/24
CPCB22F9/24C22B7/006C22B11/046Y02P10/20
Inventor 殷彬励冯如信
Owner WENZHOU LONGSUN ELECTRICAL ALLOY CO LTD
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