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Method of recovering sodium sulfate from lead-bearing desulfurized waste liquid

A desulfurization waste liquid, sodium sulfate technology, applied in the direction of alkali metal sulfite/sulfate purification, etc., can solve problems such as limitation and neglect of recovery of sodium sulfate

Active Publication Date: 2014-05-07
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the above-mentioned technologies mainly consider the current increasingly urgent lead recovery, but ignore how to efficiently recover sodium sulfate in the desulfurization waste liquid, resulting in the accumulation of sodium sulfate
In addition, because the existing desulfurization process does not consider the removal and recovery of sodium sulfate in depth, the sodium sulfate produced in the above process is often mixed with a small amount of lead oxide and NaOH, which greatly limits its use in many non-lead industries, especially food and medicine. Therefore, how to efficiently remove lead ions in desulfurization waste liquid, so as to recover high-purity lead-free sodium sulfate has become an increasingly urgent problem

Method used

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  • Method of recovering sodium sulfate from lead-bearing desulfurized waste liquid

Examples

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Effect test

Embodiment 1

[0031] Take 10 liters of 2.20 mol / L NaOH solution to desulfurize the waste lead plaster of blue sky electric vehicle and recover the desulfurization waste liquid. Through conventional chemical titration analysis, the desulfurization waste liquid mainly contains 1.02 mol / L sodium sulfate and 0.15 mol / L sodium hydroxide, and contains 0.002 mol / L lead ions. This waste liquid reclaims sodium sulfate, lead carbonate, and the process of realizing NaOH solution regeneration is as follows:

[0032] (1) Add 0.065 mol / L sodium acetate as lead oxide complexing agent to the desulfurization waste liquid, then add 0.0195 mol sodium bicarbonate to the solution for carbonation, so that the lead ions in the solution form lead carbonate precipitation;

[0033] (2) Carry out solid-liquid separation subsequently, obtain sodium sulfate filtrate and lead carbonate precipitation;

[0034] (3) Add 280 g of anhydrous sodium sulfate and 2.4 L of NaOH solution with a concentration of 12 mol / L to the so...

Embodiment 2

[0038] Take 10 liters of 2.50 mol / L NaOH solution to desulfurize the waste lead plaster of Fengfan lead-acid battery and recover the desulfurization waste liquid. Through conventional chemical titration analysis, the desulfurization waste liquid mainly contains 1.13 mol / L sodium sulfate and 0.21 mol / L of NaOH, while containing 0.004 mol / L of lead ions. This waste liquid reclaims sodium sulfate, lead carbonate, and the process of realizing NaOH solution regeneration is as follows:

[0039] (1) After adding 0.025 mol / L nitrilotriacetic acid as a lead oxide complexing agent to the desulfurization waste liquid, 0.039 mol carbon dioxide is introduced into the solution for carbonation, so that the lead ions in the solution form lead carbonate precipitates;

[0040] (2) Carry out solid-liquid separation subsequently, obtain sodium sulfate filtrate and lead carbonate precipitation;

[0041] (3) add 426g anhydrous sodium sulfate and 2.3 L concentration in the sodium sulfate filtrate af...

Embodiment 3

[0045] Take 5 liters of 3.0 mol / L NaOH solution to desulfurize the lead-containing flue ash obtained from ordinary lead-acid battery smelting and recover the desulfurization waste liquid. According to conventional chemical titration analysis, the desulfurization waste liquid mainly contains 1.33 mol / L sodium sulfate and 0.12 mol / L NaOH, and also contains 0.002 mol / L lead ion and 0.001 mol / L lead sulfate suspended. This waste liquid reclaims sodium sulfate, lead carbonate, and the process of realizing NaOH solution regeneration is as follows:

[0046] (1) Add 0.06 mol / L ethanolamine to the desulfurization waste liquid as a lead complexing agent, and then add 0.0145 mol sodium bicarbonate to the solution for carbonation, so that the lead ions and lead sulfate in the solution are converted into more insoluble lead carbonate precipitation;

[0047] (2) Carry out solid-liquid separation subsequently, obtain sodium sulfate filtrate and lead carbonate precipitation;

[0048] (3) Af...

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Abstract

The invention discloses a method of recovering sodium sulfate from a lead-bearing desulfurized waste liquid. The method is characterized by comprising the following steps: after adding a complexing agent into the lead plaster-bearing desulfurized waste liquid, forming a lead carbonate precipitate of lead complex ions in the liquor by adopting carbon dioxide or sodium hydrogen carbonate, and then carrying out solid-liquid separation to obtain a sodium sulfate filtrate and the lead carbonate precipitate; adding anhydrous sodium sulfate and sodium hydroxide into the sodium sulfate filtrate obtained by separating lead carbonate, and cooling at low temperature to separate out sodium sulfate crystals; and returning the filtrate without the sodium sulfate crystals again for desulfurization of lead oxide-bearing wastes.

Description

technical field [0001] The invention belongs to the field of effective utilization of resources, and is a method for comprehensively treating waste liquid containing sodium sulfate and lead oxide after desulfurization of waste lead plaster, recovering sodium sulfate, and producing lead carbonate by-product. Background technique [0002] Since the invention of lead-acid battery by Plant in 1859, lead-acid battery has occupied a major position in the car battery and electric bicycle market due to its reliable performance and low price. According to statistics from the Battery and Nonferrous Metals Association, the consumption of refined lead in the field of lead-acid batteries in my country in 2012 was 3.3 million tons, accounting for about 71% of the total lead consumption. Due to the rapid development of my country's social economy and the gradual popularization of automobile consumption, it can be predicted that the consumption of lead-acid batteries will continue to grow f...

Claims

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Application Information

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IPC IPC(8): C01D5/16
Inventor 潘军青吴艳艳孙艳芝张超
Owner BEIJING UNIV OF CHEM TECH
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