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Method for removing chromium impurities from nickel leach liquor

A technology for leachate and impurities, applied in the field of removing chromium impurities from nickel leachate, can solve the problem of poor nickel taste, and achieve the effects of less nickel loss rate, high economic benefit and high chromium removal rate

Active Publication Date: 2012-07-04
JINGMEN GEM NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nickel recovered by this method is often of poor quality due to the mixture of impurities such as iron.

Method used

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  • Method for removing chromium impurities from nickel leach liquor
  • Method for removing chromium impurities from nickel leach liquor
  • Method for removing chromium impurities from nickel leach liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 500mL nickel concentration is 36.70g / L, chromium concentration is 8.78g / L, initial pH value is 1.0 nickel leaching solution I; Add the NaOH solution that 46mL concentration is 4.73mol / L, adjust the initial pH value of nickel leaching solution I to be 2.5 .

[0032] At a temperature of 70°C, add 18.83g of sodium pyrophosphate (excess coefficient 1.0), stir and react for 1 hour, filter to obtain chromium pyrophosphate (Cr 4 (P 2 o 7 ) 3 ) and nickel pyrophosphate (Ni 2 P 2 o 7 ) mixed precipitate I and 365mL nickel leaching solution II with a nickel concentration of 23.35g / L and a chromium concentration of 1.71g / L for the removal of chromium and nickel. In addition, chromium pyrophosphate (Cr 4 (P 2 o 7 ) 3 ) and nickel pyrophosphate (Ni 2 P 2 o 7 ) Mixing the precipitate I to obtain 2850mL of washing solution III with a nickel concentration of 3.64g / L and a chromium concentration of 0.074g / L. Chromium pyrophosphate (Cr 4 (P 2 o 7 ) 3 ) and nickel py...

Embodiment 2 Embodiment 10

[0036] The method is the same as in Example 1, and 500 ml of nickel leach solution I with a nickel concentration of 36.70 g / L, a chromium concentration of 8.78 g / L and an initial pH value of 1.0 is taken. See Table 1 for the differences in parameters in the technical solutions of Embodiment 2 to Embodiment 10.

[0037] Table 1. Differences in parameters in the technical solutions of Embodiment 2 to Embodiment 10

[0038]

[0039]

[0040] in conclusion

[0041] After adjusting the pH value of nickel leaching solution and adding precipitant to precipitate Cr 3+ In the process, chromium can be effectively removed by reasonably controlling the pH value, the amount of precipitant used, and the reaction temperature and time, and the removal effect of chromium is obvious. When the excess coefficient of sodium pyrophosphate is low (1.0), the removal rate of chromium reaches more than 83%, and when the excess coefficient of sodium pyrophosphate increases to 1.6, the removal ra...

Embodiment 11

[0043] The impurity-removing dry slag I after the aforementioned washing is dried and ground into a uniform fine powder. In the powder, the nickel content is 12.69%, the chromium content is 7.57%, and the phosphorus content is 11.2%.

[0044] Take 30g of fine powder and add 300mL of tap water to make a slurry, add it to 10mL of NaOH solution with a concentration of 5mol / L, and adjust the pH value to 9.0. Stir and react at 80°C for 2 hours, filter to obtain 340ml of phosphorus-containing solution IV and chromium pyrophosphate (Cr 4 (P 2 o 7 ) 3 ) and nickel hydroxide (Ni(OH) 2 ) Mixed Precipitate II. Add the mixed precipitate II to 300ml of bottom water, and then add 15mL of H with a concentration of 6mol / L. 2 SO 4 solution, adjust the pH to 2.0. Heat up to 80° C., stir and react for 1 hour, then filter to obtain 440 ml of nickel leaching solution V and chromium pyrophosphate slag III with a nickel concentration of 5.35 g / L and a chromium concentration of 0.21 g / L. The ...

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Abstract

The invention provides a method for removing chromium impurities from nickel leach liquor, which comprises the following steps of: (1) regulating the pH value of the nickel leach liquor; (2) adding a precipitator to produce chromium precipitates; and (3) separating the chromium precipitates to obtain the nickel leach liquor from which the chromium is removed, wherein the precipitator is pyrophosphate, phosphate, monohydric phosphate or polyphosphate, and after the precipitator is added in the step (2), the method comprises the step of precipitation conversion further. By the method, the chromium impurities can be removed effectively, and the recovery rate of the nickel can be improved to fulfill the aims of low loss rate of the nickel and high dechromisation rate, so the method has huge economic and social benefits.

Description

technical field [0001] The invention relates to a method for removing impurities from industrial waste, in particular to a method for removing chromium impurities from nickel leachate. Background technique [0002] Nickel-chromium waste mainly comes from nickel-chromium alloy chip waste and scrap, superalloy waste, nickel-chromium waste liquid treatment slag and nickel-chromium industrial waste. With the rapid development of industrialization, more and more nickel-chromium waste will appear in these years. If these nickel-chromium wastes are not properly utilized, it will cause a great waste of resources. And the massive accumulation of these nickel-chromium wastes will cause serious pollution to the environment. [0003] At present, nickel-chromium waste is usually dissolved in acid solution in industry to make NiCl-containing 2 or NiSO 4 The nickel leaching solution, and then add Na to the nickel leaching solution 2 CO 3 , generating NiCO 3 Precipitate, then NiCO 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/66
Inventor 王勤何显达
Owner JINGMEN GEM NEW MATERIAL
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