Method for processing nickle-containing residual ores
A nickel residue and content technology, applied in the field of metallurgy, can solve problems such as environmental pollution, need for improvement, and land occupation
Active Publication Date: 2015-07-01
CHINA ENFI ENGINEERING CORPORATION
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Problems solved by technology
However, the iron slag produced by the iron removal method is difficult to be used in industries such as cement and building materials due to its low iron content, high sulfur content, and high slag properties.
A large amount of slag is piled up, which not only occupies a large amount of land, but also causes potential pollution to the environment
[0003] Therefore, the current method of processing nickel-containing residual ore still needs to be improved
Method used
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Embodiment 1
[0067] refer to figure 2 , Use sulfuric acid to leaching iron ore with sulfuric acid to obtain a leachate (leach slurry) containing ferric sulfate. Under the conditions of normal pressure, temperature 85-98°C and mechanical stirring speed of 250rpm, use magnesia ore to reduce the concentration of free acid in the obtained leachate from 40-45g / L to 4.5-5g / L, and the pH to 1.0 ~2.5, when the temperature is 95 degrees Celsius, ferric iron is hydrolyzed to form ferric oxide precipitate, as shown in the following reaction formula. In this way, iron can be removed from the leaching solution, and at the same time, valuable components such as nickel and cobalt in the magnesia ore are dissolved by acid.
[0068] Fe 2 (SO 4 ) 3 +3H 2 O=Fe 2 o 3 +3H 2 SO 4
[0069]Next, use magnesium hydroxide slurry as a neutralizing agent to neutralize the sulfuric acid generated in the above steps at boiling point temperature, so as to maintain the pH at 1.0-2.5, react for 3-6 hours, and the...
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Abstract
The invention discloses a method for processing nickle-containing residual ores. The method comprises the following steps of dividing the nickle-containing residual ores into magnesium ores and iron ores; carrying out leaching processing on the iron ores by utilizing sulfuric acid so as to obtain lixivium containing ferric sulfate, wherein content of free acid in the lixivium containing ferric sulfate is 40 to 45g / L; at a temperature of 85 to 98 DEG C, carrying out primary neutralizing treatment on the lixivium containing ferric sulfate by utilizing the magnesium ores so as to reduce the content of the free acid in the lixivium to 5g / L; at a temperature of 85 to 98 DEG C, carrying out secondary neutralizing treatment on the lixivium subjected to primary neutralizing treatment by utilizing a first neutralizer so as to keep the pH of the lixivium subjected to primary neutralizing treatment in the range of 1.0 to 2.5; and carrying out tertiary neutralizing treatment on the lixivium subjected to secondary neutralizing treatment by utilizing a second neutralizer and filtering so as to obtain high-iron filter residues and the lixivium containing nickel and cobalt. By utilizing the method, valued metals in the nickle-containing residual ores can be effectively recovered.
Description
technical field [0001] The invention relates to the field of metallurgy, in particular to a method for treating nickel-containing residual ore. Background technique [0002] When carrying out sulfuric acid leaching treatment on nickel-containing residual ore, while valuable metals such as nickel and cobalt are leached out, a large amount of impurities such as iron and magnesium are also leached out at the same time. In the metallurgical industry, the jarosite method is usually used to remove iron. In short, by introducing sodium ions into the leaching solution, the pH value is controlled at about 1.1-1.2, thereby forming the jarosite method to achieve the purpose of iron removal. However, the iron slag produced by the iron removal method is difficult to be used in industries such as cement and building materials due to its low iron content, high sulfur content and high slag properties. A large amount of slag is piled up, which not only occupies a large amount of land, but a...
Claims
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IPC IPC(8): C22B7/00C22B3/08C22B3/44C22B23/00
CPCY02W30/54Y02P10/20
Inventor 李少龙董爱国时炜吴筱陆业大陈广华聂颖王魁珽
Owner CHINA ENFI ENGINEERING CORPORATION