CN-116790907-B - Method for improving grade of beta-naphthol cobalt slag by alkali-adding low-temperature curing method

Abstract

The invention discloses a method for improving the grade of beta-naphthol cobalt slag by an alkali-adding low-temperature curing method, which comprises the steps of alkali-adding low-temperature curing, water leaching and post-treatment, wherein alkali is added into cobalt slag and uniformly mixed to obtain a material a, the material a is added with uniform stirring and mixing with solid-liquid volume of 2-4 times, curing is carried out at the temperature of 110-160 ℃ for 1-4 hours to obtain a material b and smoke C, the smoke C is subjected to water absorption to prepare ammonia water, the material b is cooled and then is added with water for pulping to obtain a material d, water with solid-liquid volume of 3-12 times that of the material d is added into the material d, water leaching is carried out at the temperature of 30-80 ℃ to obtain a material e, the material e is filtered to obtain a filtrate f and a filter residue g, the filter residue g is washed with hot water for 2-4 times, the filtrate f is enriched liquid and is subjected to water treatment, and the filter residue g is enriched cobalt slag. According to the invention, the cobalt slag is cured at a low temperature under specific conditions, so that nitrogen is successfully separated from cobalt by ammonia which is easy to absorb and treat, and the grade of the cobalt slag is improved after clinker is immersed in water.

Inventors

• LIU JUNCHANG
• MOU XINGBING
• WANG KUN
• ZOU WEI
• YANG RUIXIAO
• FU WEIQIN
• HE XIAOCAI
• DIAO WEIZHI
• YAN SEN

Assignees

• 昆明冶金研究院有限公司

Dates

Publication Date

20260508

Application Date

20230612

Claims (5)

1. 1. The method for improving the grade of the beta-naphthol cobalt slag by an alkali-adding low-temperature curing method is characterized by comprising the steps of alkali-adding low-temperature curing, water leaching and post-treatment: A. adding alkali and curing at low temperature: 1) Adding alkali into cobalt slag, and uniformly mixing to obtain a material a; 2) Adding water with the volume 2-4 times of that of the material a into the material a, uniformly stirring and mixing, and curing for 1-4 hours at the temperature of 110-160 ℃ to obtain a material b and smoke C, wherein the smoke C is absorbed by water to prepare ammonia water; B. Soaking in water: 1) Cooling the material b, adding water and pulping to obtain a material d; 2) Adding water with the volume 3-12 times of that of the material d into the material d, and soaking the material d in water for 2-6 hours at the temperature of 30-80 ℃ to obtain a material e; C. And (3) post-treatment, namely filtering the material e to obtain a filtrate f and a filter residue g, washing the filter residue g with hot water for 2-4 times, wherein the filtrate f is enriched liquid and is subjected to water treatment, and the filter residue g is enriched cobalt residue.
2. 2. The method for improving the grade of the beta-naphthol cobalt slag by the alkali-adding low-temperature curing method according to claim 1 is characterized in that alkali is any one of NaOH, or NaOH or Na 2 CO 3 , or NaOH, na 2 SO 3 , or NaOH or Na 2 CO 3 、Na 2 SO 3 , and the mass ratio of the cobalt slag to the alkali is 1 (0.25-1.5).
3. 3. The method for improving the grade of beta-naphthol cobalt slag by an alkali-adding low-temperature curing method according to claim 2, wherein the mass ratio of the cobalt slag to the alkali is 1 (0.75-1.0).
4. 4. The method for upgrading beta-naphthol cobalt slag by using an alkali low-temperature curing method according to claim 1, wherein the water immersion temperature is 50-80 ℃.
5. 5. The method for improving the grade of beta-naphthol cobalt slag by an alkali-adding low-temperature curing method according to claim 1, wherein the water immersion time is 3-5 hours.

Description

Method for improving grade of beta-naphthol cobalt slag by alkali-adding low-temperature curing method Technical Field The invention belongs to the technical field of mining engineering, and particularly relates to a method for improving the grade of beta-naphthol cobalt slag by an alkali-adding low-temperature curing method. Background The zinc blende is often accompanied with metals such as cobalt, and the metals can enter into zinc sulfate solution along with zinc dissolution in the zinc smelting process, and after the cobalt ion concentration in zinc electrolyte reaches a certain amount, the zinc electrolysis burn-in plate can be dissolved back, so that the current efficiency, the electricity unit consumption and other zinc indexes of zinc electrolysis are affected, and the normal operation of production is hindered. The method has the advantages of good selectivity, low cost, convenient operation and the like, the cobalt removal of the alpha-nitroso-beta-naphthol is widely applied in the comprehensive recovery operation process of zinc smelting, the cobalt grade of the produced cobalt slag is between 6 and 10 percent, and the cobalt is in good market condition, but the method has a direct sales way, and is relatively stable, so that the subsequent cobalt smelting recovery process is long, the cost is relatively high, the alpha-nitroso-beta-naphthol cobalt slag is suitable in grade, the whole sales environment is not good, the cobalt-containing grade of the alpha-nitroso-beta-naphthol slag needs to be effectively improved in order to reduce the amount of stacked cobalt slag and realize the economic value of the alpha-nitroso-beta-naphthol slag, and conditions are created for better sales, the traditional treatment method is to directly calcine the cobalt slag after the acid-washing cobalt slag is dried, the cobalt grade of which is enriched to be more than 50 percent after the organic matters are burnt, but the alpha-nitroso-beta-naphthol contains N element, so that the calcination process generates yellow nitric oxide, and a corresponding denitration system is required to be equipped for normal operation, and other methods capable of effectively improving the alpha-nitroso-beta-naphthol slag grade are very necessary. Disclosure of Invention The invention aims to provide a method for improving the grade of beta-naphthol cobalt slag by an alkali-adding low-temperature curing method. The invention aims at realizing the following steps of low-temperature curing by adding alkali, water immersion and post-treatment: A. adding alkali and curing at low temperature: 1) Adding sodium hydroxide into cobalt slag, and uniformly mixing to obtain a material a; 2) Adding the material a into the solid liquid volume of 2-4 times of the material a, uniformly stirring and mixing, and curing at the temperature of 110-200 ℃ for 1-4 hours to obtain a material b and smoke C, wherein the smoke C is absorbed by water to prepare ammonia water; B. Soaking in water: 1) Cooling the material b, adding water and pulping to obtain a material d; 2) Adding water with 3-12 times of solid-liquid volume of the material d into the material d, and leaching at the temperature of 30-80 ℃ to obtain a material e; C. And (3) post-treatment, namely filtering the material e to obtain a filtrate f and a filter residue g, washing the filter residue g with hot water for 2-4 times, wherein the filtrate f is enriched liquid and is subjected to water treatment, and the filter residue g is enriched cobalt residue. The cobalt slag is cured under a specific condition at a low temperature to successfully separate the ammonia which is easy to absorb and treat from cobalt, and the grade of the cobalt slag is improved after clinker is immersed in water. The method has the specific principle that nitroso in alpha-nitrosobeta-naphthol is reduced into amine (R-NO is converted into R-NH 2) in a strong alkaline environment at a high temperature, the amine is further reacted with alkali to generate soluble organic sodium salt and ammonia, the ammonia volatilizes into flue gas to be absorbed by water to prepare ammonia water, clinker is soaked in water to be dispersed, so that the grade of cobalt slag can be improved by water soaking, ammonia gas is generated at a curing temperature of 100.6-147.5 ℃ through TG-MS analysis of alkaline cobalt slag, nitrogen oxide is generated after the curing temperature reaches 225.2 ℃, so that only water and ammonia are in the flue gas in a curing temperature range adopted by the method, the ammonia water is available to be prepared by absorbing a proper amount of water, and the low-temperature curing process is easier to realize in production, so that the method has higher industrial popularization and application value. Drawings FIG. 1 is a schematic diagram of a sample's TG/DSC thermogram; FIG. 2 is a schematic diagram of MS thermogram 1 of a sample; FIG. 3 is a schematic diagram of MS thermogram 2 of a sample; FIG. 4 is a schemati