Separating and recovering method for cobalt and manganese in cobalt-manganese waste

A technology for separation, recycling, and waste, applied in the direction of improving process efficiency, can solve the problem of cobalt recovery rate of only 70%, and achieve the effect of high recovery rate, high purity, and guaranteed purity

Active Publication Date: 2016-01-13
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the inventor actually processed cobalt-manganese waste according to the above method, he found that the recovery rate of cobalt was only 70%

Method used

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  • Separating and recovering method for cobalt and manganese in cobalt-manganese waste
  • Separating and recovering method for cobalt and manganese in cobalt-manganese waste

Examples

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Embodiment 1）

[0028] The cobalt-manganese waste treated in this example is the waste cobalt-manganese catalyst produced in the production of PTA, wherein the content of cobalt is 9.872wt%, and the content of manganese is 17.12wt%.

[0029] The separation recovery method of cobalt and manganese in the cobalt-manganese waste material of the present embodiment comprises the following steps:

[0030] ① Pretreatment. Take 13 grams of cobalt-manganese waste, and add 30 mL of 40% nitric acid solution to the reaction vessel containing the cobalt-manganese waste. After the cobalt-manganese waste is completely digested, measure the pH value of the acid-dissolved liquid to 1.5. The ratio of the amount of acid to the amount of cobalt-manganese in the spent catalyst is n(H + ):[n(Mn)+n(Co)]=2:1~4:1. Heat the acid-dissolved material with a pH value of less than 3.5 in a water bath at 80°C for 30 minutes, and filter with suction to remove the organic matter in the acid-dissolved material. Need to contr...

Embodiment 2）

[0042] The separation recovery method of cobalt and manganese in the cobalt-manganese waste material of the present embodiment all the other are identical with embodiment 1, difference is:

[0043] After the trivalent cobalt-ammonia complex in step ⑤ is reduced to the divalent cobalt-ammonia complex, add sodium oxalate solution dropwise under stirring, after adding n(C 2 o 4 2- ): n(Co)=8:1~20:1.

[0044] In this embodiment, 150 mL of sodium oxalate solution with a concentration of 50 g / L was added dropwise, the dropping speed was 20 mL / min, and the stirring speed was 500 r / min.

[0045] In addition to the sodium oxalate solution described in this example, ammonium oxalate can also be used instead of sodium oxalate.

[0046] Obtain 3.08g of cobalt oxalate after drying, the recovery rate of cobalt is 95.25%, and the purity of cobalt oxalate is 98.6%. Cobalt in cobalt-manganese waste is recovered in the form of cobalt oxalate. The infrared spectrogram of the cobalt oxalate ...

Embodiment 3）

[0048] The separation recovery method of cobalt and manganese in the cobalt-manganese waste material of the present embodiment all the other are identical with embodiment 1, difference is:

[0049] Step ① During pretreatment, add 44mL of 10% hydrochloric acid solution to the reaction vessel containing cobalt-manganese waste, and after the cobalt-manganese waste is completely digested, measure the pH value of the acid-dissolved liquid to 4.2. Add 10% hydrochloric acid to the acid-dissolved liquid until the pH drops below 3.5, then transfer to an 80°C water bath and heat for 30 minutes, and filter with suction to remove the organic matter in the acid-dissolved material.

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Abstract

The invention discloses a separating and recovering method for cobalt and manganese in cobalt-manganese waste. The method includes the steps that the cobalt-manganese waste is pretreated, then ammonia water is added, cobalt and manganese are subjected to complexation to generate a cobalt-manganese complex compound dissolved in a water solution, hydrogen peroxide is added after cobalt and manganese reacts for certain time, divalent manganese ions in the solution are oxidized to generate stabler manganese dioxide, and cobalt and manganese are separated through filtration; a sodium carbonate solution is added into filter liquor to precipitate manganese for the second time, remaining manganese ions in the solution are removed, and a cobalt-amine complex compound solution with the higher purity is obtained through filtration; cobalt is recovered from the cobalt-amine complex compound solution. The separating and recovering method is simple in process, the recovery rates of cobalt and manganese are high, the recovery rate of cobalt can be up to 95% or more, and the recovery rate of manganese can reach 99% or more.

Description

technical field [0001] The invention relates to a method for separating and recovering cobalt and manganese in cobalt-manganese waste. Background technique [0002] The waste cobalt-manganese catalyst produced in the production of PTA contains a large amount of cobalt and manganese elements, of which the cobalt content is about 10%, and the manganese content is about 20%. Cobalt is an important strategic metal with excellent physical and chemical properties. It is an important raw material for the production of heat-resistant alloys, hard alloys, anti-corrosion alloys, magnetic alloys and various cobalt salts; while my country's cobalt ore resources are seriously lacking, but cobalt The annual consumption of cobalt is increasing year by year, and domestic cobalt resources can no longer meet the needs of production and consumption, and most of the cobalt raw materials rely on imports. Manganese is a transition metal, hard and brittle, and will oxidize in wet places. The most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B47/00C22B23/00
CPCC22B7/007C22B23/0423C22B23/043C22B23/0438C22B23/0461C22B47/0009Y02P10/20
Inventor 刘维桥何沁华高峰尚通明周全法魏成文
Owner JIANGSU UNIV OF TECH
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