Hardness reduction treatment method for lead-zinc smelting industrial wastewater subjected to up-to-standard treatment

A technology for industrial wastewater and treatment methods, applied in filtration treatment, sedimentation treatment, water softening, etc., can solve the problems of increasing the salt content of wastewater, increasing the investment cost and operating cost of zero discharge of wastewater, etc., to reduce production load, reduce Initial investment and operating costs, the effect of convenient operation

Inactive Publication Date: 2020-08-18
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing wastewater hardness reduction treatment technology is basically sodium carbonate + sodium hydroxide hardness reduction treatment process, but this process needs to add a large amount of sodium carbonate to efficiently reduce the total hardness of raw water in the range of 800-1800mg / l to below 200mg / l, which is The unit consumption index of sodium carbonate is 3.0-4.0kg / m 3 water, which significantly increases the salt content of wastewater in the process of reclaimed water hardening treatment, which greatly increases the investment cost and operating cost of zero discharge of wastewater

Method used

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  • Hardness reduction treatment method for lead-zinc smelting industrial wastewater subjected to up-to-standard treatment
  • Hardness reduction treatment method for lead-zinc smelting industrial wastewater subjected to up-to-standard treatment

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Effect test

Embodiment 1

[0022] A treatment method for reducing the hardness of the lead-zinc smelting industrial wastewater after the standard treatment, the specific steps are:

[0023] 1) Store liquid carbon dioxide in a storage tank, convert it into gaseous carbon dioxide through an air-temperature vaporizer, and transport it to a dissolved gas reactor;

[0024] 2) Pump high-hardness reclaimed water with a total hardness of 1691mg / l and a pH of 9.33 to the dissolved air reactor to react with gaseous carbon dioxide, and consume 0.3-0.5m of gaseous carbon dioxide per cubic meter of water 3 ;

[0025] 3) After the liquid in step 2) is added to the sodium hydroxide solution, it enters the 1# reaction pool, 2# reaction pool, 3# reaction pool, and 4# reaction pool for reaction, and the single consumption of sodium hydroxide per cubic meter of water is 0.5-0.8kg , the reaction temperature is normal temperature, the reaction time is 1h, and the control reaction pH is 10.85;

[0026] 4) The liquid after ...

Embodiment 2

[0028] A treatment method for reducing the hardness of the lead-zinc smelting industrial wastewater after the standard treatment, the specific steps are:

[0029] 1) Store liquid carbon dioxide in a storage tank, convert it into gaseous carbon dioxide through an air-temperature vaporizer, and transport it to a dissolved gas reactor;

[0030] 2) Pump high-hardness reclaimed water with a total hardness of 1691mg / l and a pH of 9.33 to the dissolved air reactor to react with gaseous carbon dioxide, and consume 0.3-0.5m of gaseous carbon dioxide per cubic meter of water 3 ;

[0031] 3) After the liquid in step 2) is added to the sodium hydroxide solution, it enters the 1# reaction pool, 2# reaction pool, 3# reaction pool, and 4# reaction pool for reaction, and the single consumption of sodium hydroxide per cubic meter of water is 0.5-0.8kg , the reaction temperature is normal temperature, the reaction time is 2h, and the control reaction pH is 11.14;

[0032] 4) The liquid after ...

Embodiment 3

[0034] A treatment method for reducing the hardness of the lead-zinc smelting industrial wastewater after the standard treatment, the specific steps are:

[0035] 1) Store liquid carbon dioxide in a storage tank, convert it into gaseous carbon dioxide through an air-temperature vaporizer, and transport it to a dissolved gas reactor;

[0036] 2) Pump high-hardness reclaimed water with a total hardness of 1050mg / l and a pH of 9.26 to the dissolved air reactor to react with gaseous carbon dioxide, and consume 0.3-0.5m of gaseous carbon dioxide per cubic meter of water 3 ;

[0037] 3) After the liquid in step 2) is added to the sodium hydroxide solution, it enters the 1# reaction pool, 2# reaction pool, 3# reaction pool, and 4# reaction pool for reaction, and the single consumption of sodium hydroxide per cubic meter of water is 0.5-0.8kg , the reaction temperature is normal temperature, the reaction time is 3h, and the control reaction pH is 11.42;

[0038] 4) The liquid after ...

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Abstract

The invention relates to a hardness reduction treatment method for lead-zinc smelting industrial wastewater subjected to up-to-standard treatment, and belongs to the technical field of lead-zinc smelting industrial wastewater treatment and zero discharge. The treatment method comprises the specific steps: storing liquid carbon dioxide in a storage tank, converting the liquid carbon dioxide into gaseous carbon dioxide through an air temperature vaporizer, and conveying the gaseous carbon dioxide to a dissolved gas reactor; pumping the high-hardness reclaimed water subjected to up-to-standard treatment into the dissolved gas reactor, and carrying out a reaction with the gaseous carbon dioxide; adding a sodium hydroxide solution into the reacted liquid, and enabling the liquid to sequentiallyenter a 1# reaction tank, a 2# reaction tank, a 3# reaction tank and a 4# reaction tank for reaction; enabling the liquid after the reaction is finished to enter an inclined plate sedimentation tankfor solid-liquid separation, and filtering slag water by a filter. According to the method, a carbon dioxide and sodium hydroxide hardness reduction process is utilized, so that the hardness of raw water is continuously, stably and efficiently reduced, the salt content of the raw water is not greatly increased, the production load of subsequent high-power concentration and evaporation salting-outis reduced, and the initial investment and the operation cost of zero-emission treatment of the reclaimed water reaching the standard are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of lead-zinc smelting industrial wastewater treatment and zero discharge, and in particular relates to a treatment method for reducing hardness of lead-zinc smelting industrial wastewater after reaching the standard. Background technique [0002] The environmental protection of the lead-zinc smelting industry and the comprehensive utilization of the three wastes are the hotspots that the environmental protection departments at all levels and the society are paying close attention to. To improve the pollution control level of the lead-zinc smelting industrial wastewater and fundamentally realize zero discharge of wastewater has been achieved. Become the current focus of the government and enterprises. [0003] The polluted acid and acid wastewater produced in the lead-zinc smelting process are pre-treated to obtain high-hardness wastewater. In order to achieve zero discharge and comprehensive recycling of sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F9/00C02F2103/16C02F1/001C02F2001/007C02F5/02
Inventor 徐文凯侯郊张春徐强马云川孙举灵于龙罗小兵贺锦强谭运才刘春丽熊梓豪朱金泽寸永明杨汝刚黄宇飞殷守信周涛王军祝正龙冯丽吴兴耀
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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