Enrichment method of waste silicon dioxide carrier noble metal catalyst
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A precious metal catalyst and waste silicon dioxide technology, applied in the direction of improving process efficiency, etc., can solve the problems of difficult filtration and washing, easy corrosion, and large tail gas pollution, so as to avoid dispersion loss, wide application range, and good enrichment effect Effect
Pending Publication Date: 2022-08-02
昆明贵研新材料科技有限公司
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This method uses hydrochloric acid + chlorine gas to directly dissolve precious metals, resulting in large tail gas pollution, easy corrosion, and the production of silicic acid colloid, which is difficult to filter and wash.
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Embodiment 1
[0026] like figure 1 shown, a waste Pd-Au / SiO 2 A palladium enrichment method for a catalyst, including:
[0027] (1) The waste Pd-Au / SiO 2 The catalysts (Pd 3062g / t, Au 5925g / t) were calcined at 600°C until the carbon content was less than 1%;
[0028] (2) get 200g of spent catalyst and 600mL of sodium hydroxide solution with mass concentration of 50% and add it to a 1L high-pressure reaction kettle, fill the reaction kettle with nitrogen to discharge the air therein, cover with a sealing cover, start stirring and heating device, heated to 220 ℃, constant temperature reaction 3h;
[0029] (3) cooling down to 80 ° C, pouring out the feed liquid and adding 600 mL of water to dilute, filtering, washing, until there is no sodium silicate in the washing liquid, to obtain palladium, gold enriched slag;
[0030] (4) Palladium and gold were not detected in the filtrate; the enriched residue weighed 5.6 g after drying, and palladium and gold were enriched by 35.7 times.
Embodiment 2
[0032] A platinum enrichment method for a waste silica gel supported platinum catalyst, comprising:
[0033] (1) calcining the waste silica gel supported platinum catalyst (Pt 1.03%) at 600° C. until the carbon content is less than 1%;
[0034] (2) get 200g of spent catalyst and 600mL of sodium hydroxide solution with mass concentration of 50% and add it to a 1L high-pressure reaction kettle, fill the reaction kettle with nitrogen to discharge the air therein, cover with a sealing cover, start stirring and heating device, heated to 200 ℃, constant temperature reaction 2h;
[0035] (3) cooling down to 80° C., pouring out the feed solution and adding 600 mL of water to dilute, filtering and washing until there is no sodium silicate in the washing solution to obtain platinum-enriched slag;
[0036] (4) No platinum was detected in the filtrate; the platinum-enriched slag weighed 4.4 g after drying, and the platinum was enriched by 45.5 times.
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Abstract
The invention discloses a method for enriching a waste silicon dioxide carrier noble metal catalyst, which comprises the following steps of: dissolving a SiO2 or xSiO2.yH2O carrier by using a sodium hydroxide solution under high-temperature and high-pressure conditions, heating the system to 180-220 DEG C in a closed high-pressure reaction kettle, increasing the pressure in the kettle, and accelerating the speed of dissolving the SiO2 or xSiO2.yH2O carrier by using the sodium hydroxide to generate water-soluble sodium silicate; and the noble metal is not dissolved and retained in the leaching residue. The method comprises the following specific steps: carrying out high-temperature incineration pretreatment on the waste catalyst, adding the pretreated waste catalyst and a sodium hydroxide solution with a certain concentration into a high-pressure reaction kettle according to a certain liquid-solid ratio, introducing nitrogen to discharge air in the high-pressure reaction kettle, heating to a certain temperature, and reacting for a period of time; and adding water to dilute the reaction material liquid, filtering and washing to obtain the precious metal enriched slag. The material application range is wide, the enrichment multiple of the precious metal reaches 35 times or above, and no precious metal is dispersed in the dissolving process.
Description
technical field [0001] The invention belongs to the field of precious metal secondary resource recovery, and relates to a method for enriching a waste silica-supported precious metal catalyst. Background technique [0002] In the chemical industry, silica-supported precious metal catalysts (including silica gel (xSiO 2 ·yH 2 O) and SiO 2 It is often used in catalytic hydrogenation reactions, coupling reactions, etc., for example, platinum-based catalysts using silica gel as a carrier are used as hydrosilylation catalysts for catalyzing styrene and triethoxysilane, and synthesizing cyclohexylmethyl. Dichlorosilane, silica-supported karstedt platinum catalyst for the hydrosilylation reaction of styrene and phenyldimethylsilane, silica-supported gold-palladium alloy catalyst for the synthesis of vinyl acetate, silica-supported polypalladium catalyst Silica-supported palladium catalysts such as methyl acrylate catalytic hydrogenation are applied to the coupling reaction. Aft...
Claims
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