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Method for extracting and preparing nickel carbonate, nickel sulfate and red ferric oxide from serpentine and tailings thereof

A technology of iron oxide red and serpentine, which is applied in the direction of nickel carbonate, nickel sulfate, iron oxide, etc., can solve the problems of high equipment material requirements, large consumption of raw materials, toxic gas hydrogen sulfide, etc., and achieve low raw material consumption and high production efficiency. The effect of low cost and mild process conditions

Active Publication Date: 2013-07-31
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above that the existing methods for utilizing nickel and iron in serpentine have problems such as complex process flow, high requirements for equipment materials, large consumption of raw materials, and toxic gas hydrogen sulfide produced during the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Pretreatment: Crushing and grinding the serpentine and its tailings, after treatment, the particle size of the ore is not greater than 75 μm to obtain powder.

[0043] (2) acid leaching: add the sulfuric acid solution of mass concentration 30wt% to powder with the ratio of mass ratio 4: 1, react at 95 ℃ for 3 hours, filter and separate and collect filtrate and filter cake after reaction finishes, use filter cake Wash with water until neutral to obtain filter cake I, and combine the washing liquid and filtrate to obtain filtrate I. The filtrate I collection enters the next step, and the filter cake I collection can be used to prepare silicon series products.

[0044] (3) step-by-step precipitation: drip ammonia water to adjust the pH value of the system to 3.5 in the filtrate I obtained in step 2, react for 4 hours at 70°C, filter and separate the filter cake and filtrate after the reaction, and wash the filter cake with clear water until Neutral to obtain filter ca...

Embodiment 2

[0051] (1) Pretreatment: Crushing and grinding the serpentine and its tailings, after treatment, the particle size of the ore is not greater than 106 μm to obtain powder.

[0052] (2) acid leaching: add the sulfuric acid solution of mass concentration 48wt% to powder with the ratio of mass ratio 2.5: 1, react 4 hours at 80 ℃, after reaction finishes, filter and separate and collect filtrate and filter cake, use filter cake Wash with water until neutral to obtain filter cake I, and combine the washing liquid and filtrate to obtain filtrate I. The filtrate I collection enters the next step, and the filter cake I collection can be used to prepare silicon series products.

[0053] (3) step-by-step precipitation: in the filtrate I obtained in step 2, drip ammonia water to adjust the pH value of the system to 3.0, react at 90° C. for 3 hours, filter and separate the filter cake and filtrate after the reaction, and wash the filter cake with clear water until The filter cake II is ne...

Embodiment 3

[0060] (1) Pretreatment: Crushing and grinding the serpentine and its tailings, after treatment, the particle size of the ore is not greater than 150 μm to obtain powder.

[0061] (2) acid leaching: add the sulfuric acid solution of mass concentration 12wt% to powder with the ratio of mass ratio 10: 1, react at 60 ℃ for 5 hours, filter and separate and collect filtrate and filter cake after reaction finishes, use filter cake Wash with water until neutral to obtain filter cake I, and combine the washing liquid and filtrate to obtain filtrate I. The filtrate I collection enters the next step, and the filter cake I collection can be used to prepare silicon series products.

[0062] (3) step-by-step precipitation: drip ammonia water to adjust the pH value of the system to 4.0 in the filtrate I obtained in step 2, react at 50°C for 5 hours, filter and separate the filter cake and the filtrate after the reaction, and wash the filter cake with clear water until Neutral to obtain fil...

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Abstract

The invention discloses a method for extracting and preparing nickel carbonate, nickel sulfate and red ferric oxide from serpentine and tailings thereof. The serpentine and tailings thereof are used as raw materials. The method comprises the following unit processes of: pre-treating; performing acid leaching; performing fractional precipitation; performing ammonia leaching; acidifying; preparing nickel carbonate; preparing nickel sulfate; and calcining. According to the method, useful components such as nickel and iron in the serpentine can be fully and effectively utilized, products such as nickel carbonate, nickel sulfate and red ferric oxide with tight market demand can be produced, and higher nickel and iron recovery rate can be obtained. The purity of the nickel carbonate is 47.93 percent in terms of nickel and the yield is 90.10 percent; the purity of the nickel sulfate is 22.12 percent in terms of nickel and the yield is 85.73 percent; and the purity of the red ferric oxide is 92.40 percent in terms of Fe2O3 and the yield is 92.94 percent.

Description

1. Technical field [0001] The invention relates to a method for extracting nickel and iron from serpentine, in particular to a method for extracting and preparing nickel carbonate, nickel sulfate and iron oxide red from serpentine and its tailings. 2. Technical background [0002] Serpentine (chemical formula Mg 3 [Si 2 o 3 ](OH) 4 ) is a natural magnesium-containing silicate mineral that is abundantly stored in my country, and its main components are MgO and SiO 2 , also contains a small amount of NiO, Fe 2 o 3 Wait. A large amount of tailings will be produced during the mining and processing of serpentine ore. If not utilized, it will cause serious environmental pollution and waste of resources. The analysis results show that the chemical composition of the serpentine tailings is similar to that of the original ore. For a long time, people have focused on the research on the utilization of silicon and magnesium in serpentine and its tailings, such as the use of sil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/06C01G53/10C01G49/06
Inventor 于少明王刚曹星辰
Owner HEFEI UNIV OF TECH
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