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Lead removal method for nickel chloride solution

A nickel chloride and solution technology, applied in the field of lead removal, can solve the problems of high cost, insufficient lead removal depth, low efficiency, etc., and achieve the effects of low cost, high lead removal efficiency, and short process flow

Pending Publication Date: 2022-03-01
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is: in order to solve the problem that the lead of nickel chloride solution in the prior art has long process, low efficiency, high cost, and insufficient depth of lead removal, the present invention provides a method for removing lead from nickel chloride solution, through In the lead removal step, the nickel chloride solution is reacted to obtain the lead-removed solution and lead-containing slag, and the lead-containing slag is washed through the lead-removal slag washing step to obtain lead sulfate. The process of this method is shorter, the cost is lower, and the lead-removal efficiency is higher. High, the lead content in the solution after lead removal is less than 0.00005g / L, which meets the production needs of Ni9999 high-quality electric nickel, and the output lead slag is lead sulfate, which can be opened from the system and sold as a commodity. Further remove trace impurities such as cobalt, copper, iron and manganese contained in the solution after pre-purification

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  • Lead removal method for nickel chloride solution
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Embodiment 1

[0022] Such as figure 1 As shown, this embodiment provides a method for removing lead from a nickel chloride solution. Take 800 mL of lead-containing nickel chloride solution in a four-necked flask, the initial pH of the solution is 4.5, and the initial oxidation-reduction potential is 750 mV. Heating and stirring, when the temperature rises to 65°C and is maintained, introduce chlorine gas, control the flow rate of chlorine gas, and keep the solution potential to rise steadily to 1050mV. At this time, the pH of the solution drops to about 2.5, slowly add nickel carbonate slurry solution, and adjust the pH to 3.9 At this time, the potential correspondingly drops to about 900mV. By adjusting the flow rate of chlorine gas and the amount of nickel carbonate added, the pH of the solution is kept at 3.85-3.9, and the redox potential is 1020-1050mV. React for 4 hours. After the reaction is completed, filter and take a sample for analysis. Table 2. The chlorine gas escaped from the ...

Embodiment 2

[0027] Such as figure 1 As shown, this embodiment provides a method for removing lead from nickel chloride solution. Take 800 mL of lead-containing nickel chloride solution in a four-necked flask, the initial pH of the solution is 4.5, and the initial potential is 750 mV. Heating and stirring, when the temperature rises to 60°C and is maintained, introduce chlorine gas, control the flow rate of chlorine gas, and keep the potential of the solution rising steadily to 1020mV. At this time, the pH of the solution drops to about 2.5, slowly add nickel carbonate slurry solution, and adjust the pH to 4.0 At this time, the potential correspondingly drops to about 900mV. By adjusting the flow rate of chlorine gas and the amount of nickel carbonate added, the pH of the solution is kept at 3.9-4.0, the potential is 990-1020mV, and the reaction is performed for 3 hours. After the reaction is completed, filter and take samples for analysis. . The chlorine gas escaped from the reaction is ...

Embodiment 3

[0032] Such as figure 1As shown, this embodiment provides a method for removing lead from nickel chloride solution. Take 800 mL of lead-containing nickel chloride solution in a four-necked flask, the initial pH of the solution is 4.5, and the initial potential is 750 mV. Heating and stirring, when the temperature rises to 70°C and is maintained, introduce chlorine gas, control the flow rate of chlorine gas, and keep the solution potential to rise steadily to 1070mV. At this time, the pH of the solution drops to about 2.5, slowly add nickel carbonate slurry solution, and adjust the pH to 3.9 At this time, the potential drops to about 1000mV accordingly. By adjusting the flow rate of chlorine gas and the amount of nickel carbonate added, the pH of the solution is kept at 3.8-3.9, the potential is 1050-1070mV, and the reaction is 2.5h. After the reaction is completed, filter, sample and analyze. 4. The chlorine gas escaped from the reaction is absorbed by liquid caustic soda. S...

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Abstract

The invention discloses a lead removal method for a nickel chloride solution, relates to the technical field of lead removal, and aims to solve the problems of long flow, low efficiency, high cost and insufficient lead removal depth in the process of removing lead in the nickel chloride solution in the prior art. The nickel chloride solution is subjected to oxidation-reduction potential increasing and neutralized with nickel carbonate, the pH value of the neutralized solution is stabilized, and after the reaction is finished, a lead-removed solution and lead-containing slag are obtained after liquid-solid separation; and a lead slag removing and washing step: washing the lead-containing slag with sulfuric acid-containing water, filtering after washing, enabling the washing liquid to enter a nickel production system, and converting the washing slag into lead sulfate. According to the method, the technological process is shorter, the cost is lower, the lead removal efficiency is higher, the lead content of the solution obtained after lead removal is smaller than 0.00005 g / L, the Ni9999 high-quality electric nickel production requirement is met, and the produced lead slag is lead sulfate to be sold as a commodity.

Description

technical field [0001] The invention relates to the technical field of lead removal, and more particularly to the technical field of a method for removing lead from a nickel chloride solution. Background technique [0002] The electrolytic nickel production process of the chloride system has no industrial application in China at present. The process is to leach nickel concentrate with chlorine gas. For GB / T6516-2010Ni9999 electrolytic nickel products, it is required that the new electrolytic solution should contain no more than 0.00007g / L of lead. In the electrolytic nickel production process of the mixed acid system (including sulfuric acid and hydrochloric acid), the main methods for solution purification and removal of lead are co-precipitation and ionization. exchange method. [0003] The so-called co-precipitation method is that during the purification process of nickel electrolysis anolyte, a small part of lead is adsorbed and precipitated by iron slag and copper remo...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/44C01G21/20
CPCC22B23/0461C22B13/04C01G21/20
Inventor 张军贺景洲辛怀达陈胜利周通卢建波吉永亮郭胜旭吕海波
Owner JINCHUAN GROUP LIMITED
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