CN1329308C - Method for obtaining nickel sulfide from pickled liquor of laterite nickel ore - Google Patents

Abstract

The present invention provides a method for obtaining nickel sulfide from acid leaching liquor of laterite nickel mine, which is characterized in that the present invention comprises the following steps: the ph-value of leaching-out liquor after normal-pressure acid leach is adjusted to be more than or equal to 1.7; sodium sulfide is added into the leaching-out liquor in the ratio that the quality ratio between the nickel and the sodium sulfide is equal to 1 to (3-8), the leaching-out liquor and the sodium sulfide are uniformly stirred and blended, and the concentration of nickel ions is controlled to be less than 0.02 gram per liter hour; filtration: after filter residue is watered, slurried, washed and filtered according to the quantity ratio between solid and liquid of 1 to 2, a nickel sulfide product is obtained; after filter liquor is neutralized, the ph-value of the filter liquor reaches a value of 2 to 4, and the filter liquor is recovered, utilized or discharged. The nickel sulfide product which is a raw material for producing high-quality 1 <#> electrolyzed nickel with the nickel content more than 25% can be precipitated by adopting the invention, and the nickel precipitation rate is up to above 99.5%. The present invention has the advantages of high precipitation speed, favorable filtering performance, simple manufacturing process, less investment, low energy consumption, low cost, no environment pollution, high social benefit and economic benefit, etc. The present invention can effectively recover the nickel in the laterite nickel mine and the nickel in lower-grade nickel sulfide mine, and thereby, the resource utilizing rate of the nickel is improved.

Description

From the red soil nickel ore pickling liquor, obtain the method for nickelous sulfide

Technical field

The present invention relates to a kind of nickelous sulfide preparation method, especially a kind of method that directly from red soil nickel ore or nickel sulfide ore heap leaching solution, obtains the nickelous sulfide cobalt.

Background technology

The technology of handling nickel sulfide ore at present has following several: 1. press hot acid to soak, and suitable treatment irony nickel minerals, nickeliferous 〉=1.5% contains Mg≤3.0%, can reduce the acid consumption, and nickel recovery is higher; 2. reducing roasting ammonia soaks, suitable treatment irony nickel minerals, and nickeliferous 〉=1.5%, nickel recovery is higher; 3. ferronickel method, the magnesia ore deposit of suitable treatment, nickeliferous 〉=1.5% can comprehensively reclaim iron; 4. matte smelting method, the magnesia ore deposit of suitable treatment, nickeliferous 〉=2.0%, nickel recovery is higher.Because above-mentioned each technology all exists investment big, operation working cost height, it is little to adapt to scope of resource, the high deficiency of production cost, the low-grade red soil nickel ore of unsuitable exploitation.The explored red soil nickel ore reserves of our province are 6,000 ten thousand tons, and its mineralogical composition is: Ni0.5-1.1%, Mg 3-15%, Fe 3-20%, Ca 1-3%, Co 0.03-0.08%, Al 1-4%, Si 1-8%.But owing to be subjected to the low restriction of grade, not development and use preferably so far.Handling red soil nickel ore with normal pressure acidleach method, is the present inventor through concentrating on studies for many years and many times test draws.But with the leach liquor after the prior art processing acidleach, not only treatment technology complexity, and investment is big, and the production cost height is restricting the utilization of red soil nickel ore and low-grade nickel sulfide ore.

Summary of the invention

The present invention is directed to leach liquor treatment technology complexity after the existing red soil nickel ore acidleach, the working cost height, deficiencies such as contaminate environment, it is simple to propose a kind of treatment process, invests for a short time, and production cost is low, high efficiency, remarkable in economical benefits, free of contamination leach liquor treatment process is so that obtain nickelous sulfide from the red soil nickel ore pickling liquor.

The present invention realizes by following technical proposal: a kind of method that obtains nickelous sulfide from the red soil nickel ore pickling liquor is characterized in that:

Leach liquor pH value 〉=1.7 after A, the acidleach of adjustment normal pressure, in leach liquor, add in sodium sulphite, potassium sulphide, sulfurated lime, magnesium sulfide, aluminium sulfide, the manganese sulfide one or more: nickel: one or more in sodium sulphite, potassium sulphide, sulfurated lime, magnesium sulfide, aluminium sulfide, the manganese sulfide=1: 3-8 by following mass ratio, stirring and evenly mixing, when controlling nickel ion concentration, filter less than 0.02 grams per liter;

B, filter residue are 1: 2 amount by solid-to-liquid ratio, after adding water and sizing mixing, wash, filter, promptly get the nickelous sulfide product;

C, filtrate make pH value reach 2-4 behind acid-base neutralisation, recycle or discharging.

Its main chemical reactions formula is:

X ₂S+NiSO ₄→NiS↓+X ₂SO ₄

X ₂S+CoSO ₄→CoS↓+X ₂SO ₄

X is potassium or sodium or calcium or magnesium or aluminium or manganese or hydrogen in the formula.

The present invention compared with prior art has following advantage and effect: adopt such scheme, precipitable go out nickeliferous greater than 25% high-quality 1 ^#Electrolytic nickel, cobalt raw materials for production---nickelous sulfide, the cobaltous sulfide product, and nickel, the cobalt deposition rate reaches more than 99.5%, directly meet the need of market, it is fast that the present invention's processing method has sedimentation speed, strainability is good, nickel, process characteristics such as cobalt casting yield height, valuable constituent---nickel and cobalt in energy efficient recovery red soil nickel ore and the low-grade nickel sulfide ore, significantly improve nickel, the cobalt resource utilization ratio, handle Yunnan Province's Yuanjiang River and Mojiang nickel minerals with the present invention, can make a profit ten thousand yuan of tax 2-4 of one ton of nickel of every production have application value preferably, it is simple that other the present invention also has technology, invest for a short time, energy consumption is low, and production cost is low, free from environmental pollution, the more high advantage of social benefit and economic benefit.

Main economic and technical norms when following table provides with the present invention's art breading nickel minerals:

Sequence number	Project name	Index	Remarks	Sequence number	Project name	Index	Remarks
								1	Leach liquor is nickeliferous	≥2g/l		6	The nickel deposition rate	≥99.5％
2	Leach liquor PH	≥1.7		7	Nickelous sulfide is nickeliferous	≥20％
								3	The Sodium Sulphide unit consumption	6t/tNi		8	Nickelous sulfide contains magnesium	≤1.8％
4	Pulping and washing concentration	3％		9	Heavy nickel power consumption	≤80kwh/tNi	Heavy nickel operation
								5	Tail washings effluxes PH	9.0		10	Heavy nickel cost	≤ 15000 yuan/tNi	Heavy nickel operation

Description of drawings

Fig. 1 is the present invention's process flow sheet.

Embodiment

Below in conjunction with specific embodiment the present invention is described further.

Embodiment 1

A, elder generation adjust the potential of hydrogen of the leach liquor after the normal pressure acidleach, make pH value reach 1.7, it is pumped in the whipping appts, press nickel in leach liquor: the mass ratio of potassium sulphide=1: 3 adds potassium sulphide, stirring and evenly mixing, when controlling nickel ion concentration, filter with existing press filtration method less than 0.02 grams per liter;

B, filter residue are 1: 2 amount by solid-to-liquid ratio, after adding water and sizing mixing, wash, through press filtration, pack the nickelous sulfide product;

C, in A, B two step gained filtrates, add lime its potential of hydrogen that neutralizes, make pH value reach 2, recycle.

Embodiment 2

Leach liquor pH value 1.8 after A, the acidleach of adjustment normal pressure, it is pumped in the whipping appts, press nickel in leach liquor: the mass ratio of sodium sulphite=1: 6 adds sodium sulphite, stirring and evenly mixing, when controlling nickel ion concentration, filter with existing press filtration method less than 0.02 grams per liter;

B, filter residue are 1: 2 amount by solid-to-liquid ratio, add water and size mixing, wash, after press filtration, the nickelous sulfide product;

C, in A, B two step gained filtrates, add lime, carry out acid-base neutralisation after, make pH value reach 4, discharging.

Embodiment 3

Leach liquor pH value 1.9 after A, the acidleach of adjustment normal pressure, it is pumped in the whipping appts, press nickel in leach liquor: the mass ratio of sulfurated lime=1: 8 adds sulfurated lime, stirring and evenly mixing, when controlling nickel ion concentration, filter with existing press filtration method less than 0.02 grams per liter;

B, filter residue are 1: 2 amount by solid-to-liquid ratio, add water and size mixing, wash, after press filtration, the nickelous sulfide product;

C, in A, B two step gained filtrates, after adding alkali and carrying out acid-base neutralisation, make pH value reach 3, recycle.

Claims (1)

1, a kind of method that obtains nickelous sulfide from the red soil nickel ore pickling liquor is characterized in that:

Leach liquor pH value 〉=1.7 after A, the acidleach of adjustment normal pressure, in leach liquor, add in sodium sulphite, potassium sulphide, sulfurated lime, magnesium sulfide, aluminium sulfide, the manganese sulfide one or more: nickel: one or more in sodium sulphite, potassium sulphide, sulfurated lime, magnesium sulfide, aluminium sulfide, the manganese sulfide=1: 3-8 by following mass ratio, stirring and evenly mixing, when controlling nickel ion concentration, filter less than 0.02 grams per liter;

B, filter residue are 1: 2 amount by solid-to-liquid ratio, after adding water and sizing mixing, wash, filter, promptly get the nickelous sulfide product;

C, A, B two step gained filtrates make pH value reach 2-4 behind acid-base neutralisation, recycle or discharging.