Method for recycling high-purity nickel sulfate from nickel-bearing waste batteries

A waste battery and nickel sulfate technology, which is applied in the preparation of nickel sulfate, magnesium carbonate, and nickel compounds, can solve problems such as corrosion, poor filtration performance of magnesium fluoride precipitation, and incomplete removal of magnesium ions, and achieve the effect of reducing interference

Inactive Publication Date: 2017-09-15
中矿(赣州)国际钴业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: (1) the solubility of sodium fluoride is small, the reaction time is long, heating is required, the reaction energy consumption is large, and the precipitation and filtration performance of the generated magnesium fluoride is poor; (2) sodium ions are introduced into nickel sulfate during the magnesium removal process solution, affecting the quality of nickel sulfate crystallization; (3) residual fluorine in the nickel sulfate solution has a corrosive effect on the enamel concentration kettle in the subsequent concentration process, affecting the life of the equipment; (4) fluorine in the wastewater causes wastewater treatment difficulties
Although this method can separate magnesium from nickel sulfate solution and remove the step of chemically removing magnesium, the method still has the incomplete removal of magnesium ions in nickel sulfate solution, especially for magnesium ions in high magnesium and low nickel solutions. The removal of magnesium ions is not ideal, and the magnesium ions in the nickel sulfate solution are difficult to reduce to below 50mg / L

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for reclaiming high-purity nickel sulfate from nickel-containing waste batteries of the present embodiment, its steps are:

[0027] S1: Dismantling and crushing waste nickel-containing batteries to obtain battery powder, adding carbon powder to the battery powder and roasting at a high temperature of 1000°C to remove organic matter.

[0028] S2: Using concentrated sulfuric acid to dissolve the battery powder after high-temperature roasting, adding sodium sulfate after the battery powder is completely dissolved, the rare earth elements form a precipitate, and filtering to obtain a first filtrate.

[0029] S3: Pass hydrogen peroxide into the first filtrate to oxidize ferrous iron into ferric iron, and at the same time adjust the pH of the first filtrate to 4.8-5.0 through sodium hydroxide solution, and oxidize the ferrous ions in the first filtrate into ferric ions, and then react with sodium hydroxide to form a precipitate. After filtration, the second filtra...

Embodiment 2

[0035] The difference between this embodiment and embodiment 1 is the difference in the following steps:

[0036] S2: the alkali metal sulfate is potassium sulfate;

[0037] S3: Mg in the magnesium nickel feed solution 2+ / Ni 2+ = 2, pH = 2.4, Mg 2+ The concentration is 10g / L;

[0038] S4: D402 chelating resin is used, and the number of ion exchange columns is 10;

[0039] S5: Use 0.5mol / L dilute sulfuric acid to desorb nickel ions in the ion exchange resin to obtain a nickel sulfate solution, control the flow rate of dilute sulfuric acid to 2BV / h, desorb for 60min, and use a pump to clean the exchange column with tap water at a flow rate of 10BV / h until End cleaning when the pH value of the outlet liquid is 5.0;

[0040] Except the difference in the above-mentioned steps, the operation in other each step is all identical with embodiment 1, and the recovery rate of the nickel that finally obtains is 99.0%, and product nickel sulfate content is 99.5%, and the content of im...

Embodiment 3

[0042] The difference between this embodiment and embodiment 1 is the difference in the following steps:

[0043] S2: the alkali metal sulfate is lithium sulfate;

[0044] S3: Mg in the magnesium nickel feed solution 2+ / Ni 2+ =1, pH=2.5, Mg 2+ The concentration is 5g / L;

[0045]S4: D421 chelating resin is used, and the number of ion exchange columns is 2;

[0046] S5: Use 6mol / L dilute sulfuric acid to desorb nickel ions in the ion exchange resin to obtain a nickel sulfate solution, control the flow rate of dilute sulfuric acid to 8BV / h, desorb for 10min, and use tap water to clean the exchange column at a flow rate of 15BV / h to the outlet End cleaning when the pH value of the solution is 5.0;

[0047] Except the difference in the above-mentioned steps, the operation in other each step is all identical with embodiment 1, and the recovery rate of the nickel that finally obtains is 99.2%, and product nickel sulfate content is 99.7%, and the content of impurity Mg is 0.003%...

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Abstract

The invention relates to the field of recycling of solid waste and particularly discloses a method for recycling high-purity nickel sulfate from nickel-bearing waste batteries; the method comprises the steps of disassembling the nickel-bearing waste batteries into battery powder; dissolving the battery powder with an acid to obtain dissolved solution, and adding alkali metal sulfate; removing iron by an oxidative precipitation process, and removing impurities from the dissolved solution with iron removed via an extraction process to obtain magnesium-bearing nickel liquid; passing the magnesium-bearing nickel liquid through chelate resin exchange columns, with nickel ions adsorbed by chelate resin, and magnesium-rich solution flowing out for treatment; desorbing the nickel ions to obtain nickel sulfate solution; evaporating the nickel sulfate solution, cooling, crystallizing, filtering, and drying to obtain finished nickel sulfate. By using the method, it is effectively guaranteed that the recycled finished nickel sulfate is a high-purity product having a content up to 99.5% and above, the impurity Mg content is less than 0.005% and below, and the product fully meets the standard for nickel sulfate products in HG/T2824-1997.

Description

technical field [0001] The invention belongs to the field of solid waste recovery and treatment, in particular to a method for separating and recovering nickel from nickel-containing waste batteries. Background technique [0002] Nickel is one of the important raw materials for national economic construction. With the development of national economy, the demand for nickel continues to increase. Nickel sulfate, xNiSO 4 ·6H 2 O·yNiSO 4 ·7H 2 O is often used as an important raw material in the electroplating industry for pre-nickel plating, nickel plating, nickel-iron alloy plating, nickel-cobalt alloy plating, nickel-zinc alloy plating, and in chemical nickel plating solutions; Manufacture of nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, catalysts for hardening oil or paint, mordants for vat dyes, metal colorants, etc., and are also used to prepare nickel catalysts and other nickel salts. Nickel sulfate quality requirements (industrial n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10C01F5/24
CPCC01F5/24C01G53/003C01G53/10C01P2006/80
Inventor 司马忠志
Owner 中矿(赣州)国际钴业有限公司
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