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Method for preparing high-purity cobalt nitrate by utilizing alumina-supported cobalt-based spent catalyst for Fischer-Tropsch synthesis

An alumina-loaded, waste catalyst technology, applied in inorganic chemistry, cobalt compounds, chemical instruments and methods, etc., can solve the problems of high cost and environmental pollution of waste catalysts, and achieve the effect of high recovery rate

Inactive Publication Date: 2011-05-18
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Co / Al 2 o 3 Catalysts are widely used in the Fischer-Tropsch synthesis industry, with significant economic benefits, but the high price of cobalt limits the development of this field, and the Co / Al produced by the Fischer-Tropsch synthesis industry 2 o 3 Spent catalysts can cause serious pollution to the environment

Method used

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  • Method for preparing high-purity cobalt nitrate by utilizing alumina-supported cobalt-based spent catalyst for Fischer-Tropsch synthesis
  • Method for preparing high-purity cobalt nitrate by utilizing alumina-supported cobalt-based spent catalyst for Fischer-Tropsch synthesis

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Effect test

Embodiment 1

[0018] Embodiment 1: see figure 1 , using Co / Al for Fischer-Tropsch synthesis 2 o 3 Spent catalyst is ground into uniform powder, and the result of elemental analysis is: the mass percentage of cobalt is 10.68%; Take by weighing 5.00g this powder, place in beaker, add 60mL mass fraction and be the concentrated hydrochloric acid heating of 35%~37%, keep slight Boil to dissolve it, stop heating when the amount of insoluble matter remains unchanged, filter to remove insoluble matter after cooling, and obtain CoCl 2 with AlCl 3 mixed solution. Under constant stirring, add saturated NaOH solution dropwise to the above solution until the pH is 2.3, then add 60 mL of acetic acid buffer solution with a concentration of 2 mol / L and pH 3.0, mix well and add 5.44 g of NaOH in four times 2 S·9H 2 O solid, shake for 10min after addition and let stand for 24h. The CoS precipitate was separated by filtration, and the precipitate was washed with a small amount of 2 mol / L pH 3.0 acetic a...

Embodiment 2

[0019] Embodiment 2: Fischer-Tropsch synthesis with Co / Al 2 o 3 Spent catalyst is ground into uniform powder, and the result of elemental analysis is: the mass percentage of cobalt is 19.08%, takes by weighing 7.26g this powder, is placed in beaker, adds 87mL mass fraction and is the concentrated hydrochloric acid heating of 35%~37%, keeps slight Boil to dissolve it, stop heating when the amount of insoluble matter remains unchanged, filter to remove insoluble matter after cooling, and obtain CoCl 2 with AlCl 3 mixed solution. Under continuous stirring, add saturated KOH solution dropwise to the above solution until the pH is 2.3, then add 87 mL of acetic acid buffer solution with a concentration of 2 mol / L and pH 3.0, mix well and add 14.10 g of Na in four times 2 S·9H 2 O solid, shake for 10min after addition and let stand for 24h. The CoS precipitate was separated by filtration, and the precipitate was washed with a small amount of 2 mol / L pH 3.0 acetic acid buffer sol...

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Abstract

The invention discloses a method for preparing high-purity cobalt nitrate by utilizing an alumina-supported cobalt-based spent catalyst for Fischer-Tropsch synthesis. High-purity Co(NO3)2.6H2O is obtained by the following steps of grinding, dissolving in concentrated hydrochloric acid, precipitating cobalt by sodium sulfide, precipitating cobalt by oxalic acid, roasting, dissolving in nitric acid, evaporating, crystallizing, and the like. The method has low requirements to instruments and equipments, high recovery ratio and high product purity; the cobalt recovery ratio is more than 91 percent, and the purity of the recovered and prepared Co(NO3)2.6H2O is more than 99.9 percent.

Description

technical field [0001] The invention provides a method for recycling spent catalysts, especially a method for utilizing Fischer-Tropsch synthesis to support cobalt-based (Co / Al 2 o 3 ) The method for preparing high-purity cobalt nitrate by spent catalyst. Background technique [0002] Co / Al 2 o 3 Catalysts are widely used in the Fischer-Tropsch synthesis industry, with significant economic benefits, but the high price of cobalt limits the development of this field, and the Co / Al produced by the Fischer-Tropsch synthesis industry 2 o 3 Spent catalysts will cause serious pollution to the environment. From Co / Al 2 o 3 Recycling cobalt from spent catalysts is used to produce cobalt-based catalysts again, which greatly reduces the cost of using the catalysts and effectively reduces the Co / Al 2 o 3 Spent catalysts are harmful to the environment and have broad application prospects. [0003] Chinese patent CN1401427 first uses H 2 / N 2 The mixed gas reduces the cobalt i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
Inventor 李步海孙小梅李金林余晓雪
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES