Method for comprehensively recovering waste FCC catalyst by using hydrochloric acid system

A catalyst and hydrochloric acid technology, which is applied in the preparation of nickel sulfide, nickel compound, aluminum hydroxide, etc., can solve the problems of complex process, high cost, and unsatisfactory separation effect

Active Publication Date: 2020-07-07
河北天蓝环保科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0011] However, the above-mentioned existing technologies mainly focus on the recovery of a large number of elements such as rare earths and aluminum, and seldom involve the recovery of elements such as vanadium and nickel.
Even though these elements are involved, the properties of vanadium and nickel are similar to other elements such as iron. In the case of high acidity and complex components, although these elements can be initially separated from each other, the separation effect is still not ideal, and the impurity content is relatively high. high
[0012] On the other hand, although some elements can achieve a high recovery rate, the process is relatively complicated and the cost is relatively high, making it difficult to achieve industrial-scale application

Method used

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  • Method for comprehensively recovering waste FCC catalyst by using hydrochloric acid system

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Experimental program
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Effect test

Embodiment 1

[0064] The spent FCC catalyst included the following components: 48 wt% alumina, 36 wt% silica, 4.1 wt% rare earth oxides, 1.2 wt% vanadium, 0.7 wt% nickel and 0.4 wt% iron. React it with hydrochloric acid solution and filter to obtain silicon slag and hydrochloric acid leaching solution; the reaction conditions are: hydrochloric acid concentration 8mol / L, reaction temperature 80°C, stirring time 16h, liquid-solid ratio 3:1.

[0065] The hydrochloric acid leaching solution was first adjusted to pH = 1.4 with sodium hydroxide solution, and hydrogen peroxide was added to carry out heating reaction; the reaction conditions were: temperature 60°C, reaction time 30 minutes. Use 50% (v / v) of two (2,4,4-trimethylpentyl) phosphinic acid heptane solution as extractant to extract; extraction condition is: the ratio of organic phase and aqueous phase (O / A) is 1:1, the extraction temperature is 25°C, and the extraction time is 45min; then the loaded organic phase is back-extracted with a...

Embodiment 2

[0070] The spent FCC catalyst included the following components: 48 wt% alumina, 36 wt% silica, 4.1 wt% rare earth oxides, 1.2 wt% vanadium, 0.7 wt% nickel and 0.4 wt% iron. React it with hydrochloric acid solution and filter to obtain silicon slag and hydrochloric acid leaching solution; the reaction conditions are: hydrochloric acid concentration 6mol / L, reaction temperature 85°C, stirring time 12h, liquid-solid ratio 4:1.

[0071] The hydrochloric acid leaching solution was first adjusted to pH = 1.6 with sodium hydroxide solution, then hydrogen peroxide was added, and the heating reaction was carried out; the reaction conditions were: temperature 50°C, reaction time 6h. Use 30% (v / v) of two (2,4,4-trimethylpentyl) phosphinic acid heptane solution to extract as extractant; extraction condition is: the ratio of organic phase and aqueous phase (O / A) is 2:1, the extraction temperature is 20°C, and the extraction time is 60min; then the loaded organic phase is back-extracted w...

Embodiment 3

[0076]The spent FCC catalyst included the following components: 48 wt% alumina, 36 wt% silica, 4.1 wt% rare earth oxides, 1.2 wt% vanadium, 0.7 wt% nickel and 0.4 wt% iron. React it with hydrochloric acid solution and filter to obtain silicon slag and hydrochloric acid leaching solution; the reaction conditions are: hydrochloric acid concentration 10mol / L, reaction temperature 75°C, stirring time 18h, liquid-solid ratio 2:1.

[0077] The hydrochloric acid leaching solution was first adjusted to pH = 1.2 with sodium hydroxide solution, and hydrogen peroxide was added to carry out heating reaction; the reaction conditions were: temperature 70°C, reaction time 10 minutes. Use 40% (v / v) of two (2,4,4-trimethylpentyl) phosphinic acid heptane solution to extract as extractant; extraction condition is: the ratio of organic phase and aqueous phase (O / A) is 0.5:1, the extraction temperature is 30°C, and the extraction time is 30min; then the loaded organic phase is back-extracted with...

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Abstract

The invention discloses a method for comprehensively recovering a waste FCC catalyst by using a hydrochloric acid system. The method comprises the following steps that the waste FCC catalyst is reacted with a hydrochloric acid solution; hydrogen peroxide is added into a hydrochloric acid leaching solution for reaction; extracting is conducted by using an extracting agent; the pH value is adjustedby using a sodium hydroxide solution; oxalic acid is added for precipitation reaction; and sodium sulfide is added into filtrate for precipitation reaction. According to the method for comprehensivelyrecovering the waste FCC catalyst by using the hydrochloric acid system, recovery of macroelements such as rare earth and aluminum can be achieved, recovery of elements such as vanadium and nickel isinvolved as well, the high recovery rate can be achieved, and the impurity content of vanadium and nickel is lower.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and specifically relates to a method for recovering spent catalysts; more specifically, relates to a method for comprehensively recovering spent FCC catalysts using a hydrochloric acid system. Background technique [0002] Catalytic cracking (FCC) catalyst is the most widely used catalyst in the oil refining industry. The annual consumption of FCC catalyst in my country is about 200,000 tons. During use, carbon-like substances are deposited on the FCC catalyst and condensed into coke; and, as the amount of coke deposition continues to increase, heavy metals (vanadium, nickel, iron, etc.) also increase, resulting in deactivation of the FCC catalyst. On the other hand, the FCC catalyst is damaged due to factors such as collision and thermal collapse, resulting in the production of trispin fine powder with a particle size of less than 20 microns. The spent FCC catalyst produced by the above two r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B21/00C22B34/22C22B59/00C01F7/34C01G53/11C22B23/00
CPCC01F7/34C01G53/003C01G53/11C01P2006/80C22B7/006C22B7/007C22B7/009C22B21/003C22B23/0461C22B34/225C22B59/00Y02P10/20
Inventor 刘俊峰王义军张建国石浩
Owner 河北天蓝环保科技有限公司
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