Method for calcium removal during iron precipitation of nickel sulfate solution containing iron and free sulfuric acid

A technology of nickel sulfate and anhydrous calcium sulfate, applied in the field of hydrometallurgy, can solve the problem of high cost, achieve low cost, good calcium removal effect, and avoid the effects of calcium crystallization hazards

Inactive Publication Date: 2013-11-20
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem of high cost caused by adding alkali to adjust the pH value when iron is removed from the existing nickel sulfate solution containing iron and free sulfuric acid, and provides a pH regulator using calcium carbonate, which can effectively avoid the hazard of calcium crystallization method, which is conducive to the realization of the industrial application of calcium carbonate

Method used

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  • Method for calcium removal during iron precipitation of nickel sulfate solution containing iron and free sulfuric acid

Examples

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Embodiment 1

[0026] Get 100 liters of lateritic nickel ore leachate to carry out sinking alum and remove iron, wherein nickel 65 grams per liter, containing Fe 3+ 40 g / L, containing 30 g / L of sulfuric acid, containing 0.6 g / L of calcium, heating the feed liquid to 95°C, adding 1.7 kg of sodium sulfate, adding calcium carbonate powder to adjust the pH value to 2.5-3, and adding anhydrous calcium sulfate at the same time 0.5 kilograms, filter after 3 hours, analysis filtrate calcium is 0.38 gram / liter, and the content of Fe in the filtrate is 0.3 gram / liter, analyzes the composition of filter residue with XRD simultaneously, the result is as follows figure 2 Shown, show that what generate is jarosite and anhydrous calcium sulfate, do not find the generation of dihydrate calcium sulfate; Filtrate is cooled to 40 ℃, do not observe the generation of crystalline calcium sulfate.

Embodiment 2

[0028] Get 100 liters of nickel smelter nickel sulfate waste liquid to neutralize and remove iron, wherein nickel is 65 grams per liter, and Fe 3+10 g / L, containing 30 g / L of sulfuric acid, 0.5 g / L of calcium, heating the feed liquid to 95°C, adding 0.5 kg of sodium sulfate, adding calcium carbonate powder to adjust the pH to 4.5, and adding 0.5 kg of anhydrous calcium sulfate , filter after 3 hours, analysis filtrate calcium is 0.35 gram / liter, and the content of Fe in the filtrate is 0.04 gram / liter; Filtrate is cooled to 40 ℃, does not observe the generation of crystalline calcium sulfate in the process.

Embodiment 3

[0030] Get 100 liters of nickel sulfate feed solution to neutralize and remove iron, wherein nickel is 35 grams per liter, and Fe 3+ 10 g / L, containing 30 g / L of sulfuric acid, containing 0.5 g / L of calcium, heating the feed liquid to 85°C, slowly adding calcium carbonate powder to adjust the pH value to 5, adding 0.5 kg of anhydrous calcium sulfate at the same time, filtering after 3 hours , the analysis filtrate containing calcium is 0.37 grams per liter, and the content of Fe in the filtrate is 0.35 grams per liter; The filtrate is cooled to 40 ℃, does not observe the generation of crystalline calcium sulfate in the process.

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Abstract

Belonging to the technical field of wet metallurgy, the invention relates to a method for calcium removal during iron precipitation of a nickel sulfate solution containing iron and free sulfuric acid. The method includes: during removal of iron from the nickel sulfate solution containing iron and free sulfuric acid, taking calcium carbonate as a pH regulator of the solution, and simultaneously adding an anhydrous calcium sulfate seed crystal, inducing the calcium in the solution to crystallize and precipitate out, and at the end of reaction, conducting filtering immediately, thus obtaining an iron and calcium removed nickel-containing solution. The mass concentration of iron ions in the nickel sulfate solution containing iron and free sulfuric acid is not less than 1g / l, the mass concentration of nickel ions is greater than 10g / l, and the temperature is controlled at 85-100DEG C during calcium removal. The method provided in the invention has the characteristics of simple operation, short technological process, low cost, and good calcium removal effect, etc.

Description

technical field [0001] The invention relates to a method for removing calcium during iron precipitation in a nickel sulfate solution containing iron and free sulfuric acid, and belongs to the technical field of hydrometallurgy. technical background [0002] In order to simplify the leaching process equipment and process, most manufacturers currently use a high-acid leaching laterite nickel ore, and the leaching residue is washed and discarded. The pH value of the leaching solution is about 1 to 1.5. In order to remove the iron, the yellow sodium (ammonium) iron vitriol method is generally used at a high temperature above 90°C to remove iron. At this time, sodium carbonate or ammonium carbonate needs to be added to adjust the pH value to neutralize the acid produced during the precipitation of the vitriol. Due to the expensive sodium carbonate or ammonium carbonate added, the production cost is higher. If calcium carbonate powder can be used instead of sodium carbonate or am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/08C22B23/00
CPCY02P10/20
Inventor 曾德文王文磊阳海棠陈启元
Owner CENT SOUTH UNIV
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