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Resource utilization method of waste hydrochloric acid containing heavy metal lead and iron

A waste hydrochloric acid and heavy metal technology, applied in chemical instruments and methods, separation methods, water/sludge/sewage treatment, etc., can solve the problems of large amount of concentrated sulfuric acid and high energy consumption, and achieve excellent purification performance

Inactive Publication Date: 2015-12-30
刘阳生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this technology is that the amount of concentrated sulfuric acid is large. The mass concentration of sulfuric acid in the mother liquor after ferric sulfate crystallization is only about 50%. It needs to be further evaporated and concentrated before being reused in the replacement process of dilute hydrochloric acid, which consumes a lot of energy.

Method used

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  • Resource utilization method of waste hydrochloric acid containing heavy metal lead and iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 , put 2000L waste hydrochloric acid (the mass concentration of hydrochloric acid is 15%, the mass concentration of lead ion is 1500ppm, and the mass concentration of iron ion is 8.9%) into lead removal reaction tank 3, and gradually add 250L of sodium sulfide solution with a mass concentration of 18% 1 and 18L mass concentration is 5% sodium phosphate solution 2, continue to stir and react for 30 minutes after the dropwise addition is completed, discharge to the static precipitation tank 4, stand for 1.5 hours, then pump the supernatant into the ferric chloride solution for storage The tank 5 and the sedimentation tank bottom mud 6 are filtered through the plate and frame filter press 7 to obtain the lead sulfide mud cake 8, and the plate and frame filtrate 9 is pumped into the settling tank 4.

[0024] (1) Preparation of polymerized ferric chloride flocculant: pass the ferric chloride solution through the bag filter 10 to remove fine suspended matter, ente...

Embodiment 2

[0027] see figure 1 , 2000L waste hydrochloric acid (the mass concentration of hydrochloric acid is 3%, the mass concentration of lead ion is 300ppm, the mass concentration of iron ion is 9.5%) is added in the deleading reaction tank 3, and 250L mass concentration is 10% vulcanization Potassium solution 1 and 10L mass concentration are 5% potassium dihydrogen phosphate solution 2, after dropwise addition, continue to stir and react for 50 minutes, discharge to static precipitation tank 4, stand for 3 hours, then pump the supernatant into chlorine The iron solution storage tank 5 and the bottom sludge 6 of the sedimentation tank are filtered by a plate and frame filter press 7 to obtain a lead sulfide mud cake 8, and the plate and frame filtrate 9 is pumped into the static sedimentation tank 4.

[0028] (1) Preparation of polymerized ferric chloride flocculant: pass the ferric chloride solution through the bag filter 10 to remove fine suspended matter, enter the flocculant reac...

Embodiment 3

[0030] Example 3: Example of use

[0031] The polyferric chloride flocculant prepared in Example 1 was used for domestic sewage treatment. at 1m 3 Add 1.8kg polymerized ferric chloride flocculant to the domestic sewage, stir for 10 minutes, let it settle for 60 minutes, and take samples to test the treatment effect of domestic sewage. Before treatment, domestic sewage turbidity 266NTU, COD Cr 560.8mg / L, ammonia nitrogen 31.9mg / L, total phosphorus 3.2mg / L, after treatment with polyferric chloride flocculant, turbidity decreased by 95.8%, COD Cr , ammonia nitrogen and total phosphorus removal rates were 79.5%, 81.9% and 82.9%.

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Abstract

The invention discloses a resource utilization method of waste hydrochloric acid containing heavy metal lead and iron. The method comprises the following steps: removing the lead from a sulfide solution, preparing a polymeric ferric chloride flocculating agent and purifying hydrogen sulfide gas. According to the method disclosed by the invention, lead ions in the waste hydrochloric acid are removed by a sulfide precipitation method to obtain the polymeric ferric chloride flocculating agent; after the produced hydrogen sulfide gas is subjected to falling film absorption, packed tower absorption and active carbon absorption, the hydrogen sulfide gas meets the requirements of national foul pollutant emission standards; meanwhile, sulfides are recycled and cyclic utilization of a sulfur element in a whole process is realized; in a whole purification process, the hydrogen sulfide gas is in countercurrent contact with an alkaline solution, so that the hydrogen sulfide gas can be sufficiently absorbed and the high-concentration sulfide solution is obtained. According to the method, the recycling rate of the iron in the waste hydrochloric acid is more than 90% and the removing rate of the lead is more than 99%; the purity of produced lead sulfide is equivalent to that of industrial lead sulfide, and the produced lead sulfide can be used as an industrial raw material. With the adoption of the resource utilization method disclosed by the invention, harmless treatment and resource utilization of the waste hydrochloric acid are realized.

Description

technical field [0001] The invention belongs to the field of harmless treatment of chemical waste liquid, and relates to a resource utilization method of waste hydrochloric acid containing heavy metal lead and iron. Background technique [0002] In the process of removing metal oxides on the surface of metal materials, hydrochloric acid washing is generally used to produce a large amount of low-concentration waste acid containing heavy metals (the mass concentration of hydrochloric acid is 3-12%), especially waste acid containing lead. very difficult. At present, domestic processing methods can basically be divided into two categories. [0003] The first category is treated as wastewater. After neutralization with alkaline materials such as lime, sodium carbonate or sodium hydroxide, the wastewater is treated. This method will produce a large amount of waste residue containing heavy metal lead, which is hazardous waste and needs to be solidified and stabilized before bein...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01D53/78B01D53/52C02F101/20
Inventor 刘阳生施荣标
Owner 刘阳生
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