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Waste acid purifying method

A pickling and dilute acid technology, applied in chemical instruments and methods, metallurgical wastewater treatment, photography technology, etc., to achieve the effect of saving water resources, stable water output, and low cost

Inactive Publication Date: 2020-02-21
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems existing in the treatment of the above-mentioned existing smelting waste acid, and provides a waste acid purification method

Method used

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Experimental program
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Embodiment 1

[0015] A method for recycling waste acid, comprising the following steps:

[0016] 1) Waste acid output: The roasting acid production process is to use the secondary raffinate produced in step 5) to adjust the slurry of polymetallic gold concentrates containing arsenic, carbon, copper, and zinc, and control the concentration of the slurry to 65%. After 600°C Roasting, the flue gas containing arsenic trioxide, sulfur dioxide, and mine dust produced during the roasting process is produced by gravity dust removal, electric dust removal, wet quenching to remove arsenic, pickling purification, electric fog removal, and secondary conversion and secondary absorption processes. Sulfuric acid products, the concentration of sulfuric acid produced in the pickling and purification process is 1%, and the arsenic-containing dilute acid containing 1000mg / l arsenic; It is an acid leaching solution, and the arsenic content in the acid leaching solution reaches 1000mg / l. The arsenic-containing ...

Embodiment 2

[0025] A method for recycling waste acid, comprising the following steps:

[0026] 1) Output of waste acid: The roasting acid production process is to use the secondary raffinate produced in step 5) to adjust the slurry of polymetallic gold concentrates containing arsenic, carbon, copper, and zinc, and control the concentration of the slurry to 68%. After 700°C Roasting, the flue gas containing arsenic trioxide, sulfur dioxide, and mine dust produced during the roasting process is produced by gravity dust removal, electric dust removal, wet quenching to remove arsenic, pickling purification, electric fog removal, and secondary conversion and secondary absorption processes. Sulfuric acid products, sulfuric acid produced in the pickling purification process with a sulfuric acid concentration of 5% and arsenic-containing dilute acid containing 2000 mg / l of arsenic; the acidic liquid produced by roasting the calcined sand through the acid leaching section and the filtering and wash...

Embodiment 3

[0035] A method for recycling waste acid, comprising the following steps:

[0036] 1) Waste acid output: The roasting acid production process is to use the secondary raffinate produced in step 5) to adjust the slurry of polymetallic gold concentrates containing arsenic, carbon, copper, and zinc, and control the concentration of the slurry to 70%. After 800 ° C Roasting, the flue gas containing arsenic trioxide, sulfur dioxide, and mine dust produced during the roasting process is produced by gravity dust removal, electric dust removal, wet quenching to remove arsenic, pickling purification, electric fog removal, and secondary conversion and secondary absorption processes. Sulfuric acid products, the output of sulfuric acid concentration in the pickling purification process is 10%, and the arsenic-containing dilute acid containing 3000mg / l of arsenic; the acidic liquid produced by the calcined sand after roasting through the acid leaching section and the filtering and washing se...

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PUM

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Abstract

The invention discloses a waste acid purifying method. The waste acid purifying method includes the steps of 1) waste acid production, wherein size mixing is carried out on raffinate for gold concentrates; 2) activated carbon powder adsorption, wherein the waste acid obtained in the step 1) is transferred to an activated carbon adsorption device, 3) arsenic removal through sulfide precipitation, wherein liquid obtained after absorption in the step 2) is guided into a plurality of agitator baths in series for vulcanization treatment; 4) mvr evaporation and concentration, wherein liquid obtainedafter arsenic removal through vulcanization in the step 3) is sent into an mvr evaporator for evaporation; and 5) extraction electrolysis, wherein partially-loaded organic phases are used for conducting first-stage extraction and second-stage extraction on a concentrated solution obtained in the step 4). The waste acid purifying method has the beneficial effects of comprehensive recovery of valuable metals, efficient arsenic removal, stable water outgoing, clean and efficient treatment of waste acid, cyclic utilization and zero discharge. The waste acid purifying method treats acidic wastewater produced by multi-metal sulfide mineral roasting acid production, and the removal rate of As, Cu, and Fe is much higher than that of the traditional process. The method is low in cost and can savewater resources.

Description

technical field [0001] The invention relates to the treatment of smelting wastewater, in particular to a method for purifying waste acid. Background technique [0002] Sulfur is often associated with metal-containing ores, and the smelting flue gas generated during the metal smelting process is mostly converted and absorbed into sulfuric acid. In the process of making acid from smelting flue gas, the purification process is essential. A large amount of acidic waste water will be produced during the purification process of smelting flue gas, and the acid leaching solution produced by the traditional roasting and acid leaching process will be extracted, and a large amount of acidic copper extraction residue will be obtained after copper recovery by electrowinning process. Most of these waste water contain metal ions and As, Cl, F and other non-metal ions. Traditional acid wastewater treatment methods mainly include neutralization method, microbial method, ion exchange method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B15/00C22B30/04C25C1/12C02F9/10C02F101/20C02F101/10C02F103/16
CPCC02F1/001C02F1/041C02F1/26C02F1/283C02F1/58C02F9/00C02F2101/103C02F2101/20C02F2101/203C02F2103/16C22B1/02C22B7/006C22B15/0071C22B15/0084C22B30/04C25C1/12Y02P10/20
Inventor 王建政孙德茂张玉欧海涛王敏杰刘俊伟孙学平辛朋朋王力焦磊郭建东
Owner SHANDONG GUODA GOLD
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