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A method for recovering precious metals in spent catalysts

A technology for waste catalysts and precious metals, which is applied in the field of recycling precious metals in waste catalysts, to achieve the effects of simple process, convenient operation and guaranteed fluidity

Active Publication Date: 2017-07-07
JIANGSU ZHAOLONG ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of liquid secondary pollutants produced by the recovery method of waste catalysts containing precious metals in the prior art, the present invention provides a method for recovering precious metals in waste catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Aiming at the problem that the existing recovery methods of waste catalysts containing precious metals all use wet chemical methods that are prone to produce liquid secondary pollutants, and cannot effectively control harmful elements such as sulfur, phosphorus, and silicon, so they cannot be applied to the iron and steel refining industry. The invention provides a method with simple process, low processing cost and high quality of recycled products.

[0047]Use the roaster for preliminary deoiling and then use the AOD furnace for refining. It mainly removes harmful phosphorus, sulfur and silicon elements by adding limestone and blowing high-pressure oxygen into the molten steel in the furnace. Temperature of molten steel, adjustment of chemical composition, removal of impurities, removal of gas; thus widely used in the steel refining industry.

[0048] A method for reclaiming precious metals in spent catalysts, the steps of which are:

[0049] The first step, the prep...

Embodiment 2

[0073] Embodiment 2: Dephosphorization, desulfurization and silicon removal are carried out to reclaim metal molybdenum to molybdenum-containing waste catalyst

[0074] The method steps of this embodiment are the same as in Example 1. The spent catalyst containing 14% molybdenum is sent to the roaster for oxidative roasting to remove the residual oil on the surface. CaO is added to the catalyst; in step C, according to the weight ratio of pig iron to the mixture of step B is 1:2.5, the pig iron is added to the AOD furnace at one time; in step F, the weight ratio of clay brick to the mixture of step B is 1 :300, the weight ratio of fluorite and the mixture of step B is 1:600, the weight ratio of C powder and the mixture of step B is 1:3000, and the weight ratio of silicon carbide and the mixture of step B is 1:3000, ensure filter residue Alkalinity is 3.5.

[0075] That is to say, 95% of the molybdenum metal element in the spent molybdenum catalyst can be recovered, and finall...

Embodiment 3

[0076] Embodiment 3: Dephosphorization, desulfurization and silicon removal are carried out to recover molybdenum and nickel from molybdenum and nickel waste catalysts

[0077] The method step of the present embodiment is the same as that of Example 1, and the waste catalyst containing 18% molybdenum and 5.5% nickel is sent into the roasting furnace to carry out oxidative roasting to remove the residual oil on the surface for use. In step B, according to the content P:CaO= Add CaO to the spent catalyst at a ratio of 1:1; in step C, according to the weight ratio of the mixture of pig iron and step B is 1:1, add pig iron to the AOD furnace at one time; in step F, clay bricks and step B The weight ratio of the mixture of fluorite and step B is 1:100, the weight ratio of fluorite and step B mixture is 1:200, the weight ratio of C powder and step B mixture is 1:1000, the weight ratio of silicon carbide and step B mixture For 1:1000, ensure that the filter residue alkalinity is 3. ...

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Abstract

The invention discloses a method for recovering precious metal from waste catalyst, and belongs to the field of extraction of metal from waste catalyst. The method comprises four phases of a preparation period, an oxidation period, a reduction period and an adjusting period; residual oil on the surface of the waste catalyst can be removed in the preparation period; a harmful phosphorus element can be removed by 4CaO.P2O5 furnace slag formed through an exothermic reaction of limestone and oxygen in the oxidation period; a harmful sulfur element is removed by CaS formed through limestone and an endothermic reaction in the reduction period; and in the adjusting period, an Si element can be removed through oxidation reduction to adjust the element content in a mixture. The method can remove harmful phosphorus, sulfur and silicon elements by 99.999%, can recover such precious metal as molybdenum and nickel by above 95%, finally forms such metal mixture alloys as ferromolybdenum and ferronickel with iron to be directly used in steel and iron refining, and is simple in process, low in treatment cost, high in recovered product quality and free of secondary pollution.

Description

technical field [0001] The invention belongs to the field of extracting metals from waste catalysts, in particular to a method for recovering precious metals in waste catalysts. Background technique [0002] With the development of industry, the human demand for petroleum and petrochemical products is increasing day by day, and the amount of catalysts used to produce various products is also increasing day by day. Especially in recent years, with the emergence of air pollution, smog, etc., the requirements of various environmental protection laws and regulations have become increasingly stringent, making the production of clean fuels increasingly prominent, so that hydrogenation technology in the field of oil refining has developed rapidly. The rapid development of hydrogenation technology has brought about a rapid increase in the demand for hydrogenation catalysts. For the continuous growth of catalyst usage, people also need to face the problem of catalyst deactivation ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/02C22B7/00
CPCC22B11/026Y02P10/20
Inventor 孙军平汤金鑫
Owner JIANGSU ZHAOLONG ELECTRIC
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