CN-117403073-B - Method for washing and denitrifying nickel-containing material

CN117403073BCN 117403073 BCN117403073 BCN 117403073BCN-117403073-B

Abstract

The invention belongs to the technical field of chemical metallurgy, and particularly relates to a washing denitrification method for nickel-containing materials. The method for washing and denitrifying the nickel-containing material comprises the steps of S1, first pulping the nickel-containing material with a first washing liquid to obtain a first slurry, S2, first mixing the first slurry with an additive, first stirring and washing to obtain a first nickel-containing product, S3, second mixing the first nickel-containing product with a second washing liquid, second stirring and washing to obtain a second nickel-containing product, and S4, third mixing the second nickel-containing product with a third washing liquid, and third stirring and washing to obtain a third nickel-containing product. The cation in the additive and the nitrogenous anion in the nickel-containing material generate soluble matters with extremely high solubility, the nitrogenous anion coated in the nickel-containing material is replaced or desorbed, and the nickel-containing material and the nitrogenous anion are effectively separated in a washing mode.

Inventors

ZHOU LINGYAN

Assignees

成都市联盈鼎新科技有限公司

Dates

Publication Date: 20260508
Application Date: 20231018

Claims (3)

1. A method for washing and denitrifying nickel-containing materials, which is characterized by comprising the following steps: Step S1, carrying out first pulping on a nickel-containing material and a first washing liquid to obtain a first slurry; step S2, firstly mixing the first slurry with an additive, and carrying out first stirring and washing to obtain a first nickel-containing product; Step S3, the first nickel-containing product is mixed with a second washing liquid for the second time, and the second stirring washing is carried out to obtain a second nickel-containing product; step S4, third mixing the second nickel-containing product with a third washing liquid, and carrying out third stirring washing to obtain a third nickel-containing product; The additive comprises one or more of sodium sulfate and potassium sulfate; The mass ratio of the additive to the nickel-containing material is 0.1-1:1; The first stirring and washing step further comprises the steps of carrying out solid-liquid separation on the system after the first stirring and washing step to respectively obtain a first nickel-containing product and a first liquid phase; The second stirring and washing step further comprises the steps of carrying out solid-liquid separation on the second stirring and washing system to respectively obtain a second nickel-containing product and a second liquid phase; The third stirring and washing step further comprises the step of carrying out solid-liquid separation on the second stirring and washing system to respectively obtain a third nickel-containing product and a third liquid phase; The first washing liquid is second liquid phase or water, the second washing liquid is third liquid phase or water, and the third washing liquid is water; the mass ratio of the first washing liquid to the nickel-containing material is 4-10:1, the mass ratio of the second washing liquid to the first nickel-containing product is 4-10:1, and the mass ratio of the third washing liquid to the second nickel-containing product is 4-10:1; the time of the first pulping is 0.5-2 h, and the temperature is 50-100 ℃; The first stirring and washing time is 0.1-1 h, the temperature is 50-100 ℃, the second stirring and washing time is 0.5-2 h, the temperature is 50-100 ℃, and the third stirring and washing time is 0.5-2 h, and the temperature is 50-100 ℃; The preparation method of the nickel-containing material comprises the following steps: Mixing the nickel-containing raw ore with a nitric acid solution for leaching, carrying out solid-liquid separation on the leaching solution to obtain a nickel-containing solution, and mixing the nickel-containing solution with an alkaline precipitant for precipitation reaction to obtain a nickel-containing material.
2. The method of claim 1, wherein the first, second, and third mixing are independently performed under agitation.
3. The method according to claim 1, wherein the elemental composition of the nickel-containing material comprises: 1.0-10 wt% of Co, 10-40 wt% of Ni, 2.0-10.0 wt% of Al, 1.0-3.0 wt% of Mn and 1-8 wt% of N.

Description

Method for washing and denitrifying nickel-containing material Technical Field The invention belongs to the technical field of chemical metallurgy, and particularly relates to a method for washing and denitrifying nickel-containing materials. Background Nickel ore is an important metal mineral resource in national economy, and along with the development of economy, people have a rising trend of consumption of the nickel ore resource year by year, and the demand of nickel-containing materials is gradually increased. At present, a part of raw nickel-containing ores are produced by a nitric acid process, and then the nickel ores are formed into nickel-containing materials by a precipitation mode, but the obtained nickel-containing materials have higher nitrogen content. The existence of nitrogen element results in lower nickel content and poorer quality in the nickel-containing material, and meanwhile, in the subsequent production, the nickel-containing material needs to be separated and purified by adopting an extraction method, and the excessive nitrogen content causes that the extractant is oxidatively decomposed in the extraction process, so that the loss is larger, and the selling price and the post-production treatment cost of the nickel-containing material are influenced. In the prior art, the method for denitrification treatment of the nickel-containing material mainly comprises direct washing by water, and the nitrogen content in the final nickel-containing material is still higher. Therefore, how to reduce the nitrogen content in the nickel-containing material and improve the quality of the nickel-containing material is a technical problem which we have not been able to solve. Disclosure of Invention In view of the above, the invention provides a method for washing and denitrifying nickel-containing materials, thereby obtaining nickel-containing materials with lower nitrogen content, and the process is efficient and simple, and has the advantages of green, low carbon, environmental protection and the like and great social and economic values. In order to solve the technical problems, the invention provides a method for washing and denitrifying nickel-containing materials, which comprises the following steps: Step S1, carrying out first pulping on a nickel-containing material and a first washing liquid to obtain a first slurry; step S2, firstly mixing the first slurry with an additive, and carrying out first stirring and washing to obtain a first nickel-containing product; Step S3, the first nickel-containing product is mixed with a second washing liquid for the second time, and the second stirring washing is carried out to obtain a second nickel-containing product; and S4, third mixing the second nickel-containing product with a third washing liquid, and carrying out third stirring washing to obtain a third nickel-containing product. Preferably, the additive comprises a neutral salt additive, an alkali additive or a weak acid strong base salt additive, wherein the neutral salt additive comprises one or more of sodium sulfate, potassium sulfate and sodium carbonate, the alkali additive comprises one or more of sodium hydroxide, potassium hydroxide, urea and ammonia water, and the weak acid strong base salt additive comprises one or more of sodium bicarbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate. Preferably, the mass ratio of the additive to the nickel-containing material is 0.1-1:1. Preferably, the first stirring and washing step further comprises the steps of carrying out solid-liquid separation on the system after the first stirring and washing step to respectively obtain a first nickel-containing product and a first liquid phase; The second stirring and washing step further comprises the steps of carrying out solid-liquid separation on the second stirring and washing system to respectively obtain a second nickel-containing product and a second liquid phase; And the third stirring and washing step further comprises the step of carrying out solid-liquid separation on the system after the second stirring and washing step to respectively obtain a third nickel-containing product and a third liquid phase. Preferably, the first washing liquid is a second liquid phase or water; The second washing liquid is a third liquid phase or water; The third washing liquid is water. Preferably, the mass ratio of the first washing liquid to the nickel-containing material is 4-10:1; The mass ratio of the second washing liquid to the first nickel-containing product is 4-10:1; and the mass ratio of the third washing liquid to the second nickel-containing product is 4-10:1. Preferably, the first, second and third mixing are independently performed under stirring conditions. Preferably, the time of the first pulping is 0.5-2 h, and the temperature is 50-100 ℃. Preferably, the time of the first stirring washing is 0.1-1 h, and the temperature is 50-100 ℃; the second stirring and washing time is