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Method for cascade disposal of arsenic-containing waste acid through copper slags

A technology of arsenic acid and copper slag, applied in chemical instruments and methods, multi-stage treatment of water/sewage, water pollutants, etc., can solve the problems of low utilization rate of copper slag, occupying land, polluting the environment, etc. Benefit and economic benefits, significant arsenic removal effect, simple operation process

Inactive Publication Date: 2019-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization rate of copper slag is very low. Only a small part is used for cement production auxiliary materials, road subgrade aggregate and anti-corrosion rust remover, etc. Most of them are piled up in the slag yard, which not only occupies land but pollutes the environment, and also causes a huge waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic, which is produced after the sulfuric acid workshop of a copper smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 1;

[0023] Table 1 Concentration of various components of polluted acid

[0024] element As Zn Sb Fe Cu Mg Pb Cr Content (mg / L) 9000.0 13.2 11.5 13.5 21.6 12.4 5.5 0.3

[0025] A method for cascade disposal of arsenic-containing polluted acid using copper slag, the specific steps are as follows:

[0026] (1) Copper slag, dirty acid and H 2 o 2 The solution was uniformly mixed, and the arsenic precipitation reaction was carried out at a temperature of 70°C and a stirring rate of 180r / min for 3 hours to obtain a solid-liquid mixture A, and the solid-liquid separation obtained arsenic-containing solid A and filtrate A (see Table 2); the copper s...

Embodiment 2

[0036] Example 2: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic, which is produced after the sulfuric acid workshop of a zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 5;

[0037] Table 5 Concentration of various components of polluted acid

[0038] element As Zn Sb Fe Cu Mg Pb Cr Content (mg / L) 10230.0 24.2 9.7 11.5 5.9 9.4 6.5 0.7

[0039] A method for cascade disposal of arsenic-containing polluted acid using copper slag, the specific steps are as follows:

[0040] (1) Copper slag, dirty acid and H 2 o 2 The solution was uniformly mixed, and the arsenic precipitation reaction was carried out at a temperature of 80°C and a stirring rate of 190r / min for 4 hours to obtain a solid-liquid mixture A, and the solid-liquid separation obtained arsenic-containing solid A and filtrate A (see Table 6); among them, copp...

Embodiment 3

[0050] Embodiment 3: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of a copper smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 9;

[0051] Table 9 Concentration of each component of polluted acid

[0052] element As Zn Sb Fe Cu Mg Pb Cr Content (mg / L) 13000.0 15.3 12.2 17.5 25.9 11.5 7.7 0.9

[0053] A method for cascade disposal of arsenic-containing polluted acid using copper slag, the specific steps are as follows:

[0054] (1) Copper slag, dirty acid and H 2 o 2 The solution was uniformly mixed, and the arsenic precipitation reaction was carried out at a temperature of 90°C and a stirring rate of 200r / min for 5 hours to obtain a solid-liquid mixture A, and the solid-liquid separation obtained arsenic-containing solid A and filtrate A (see Table 10); among them, copper sl...

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Abstract

The invention relates to a method for cascade disposal of arsenic-containing waste acid through copper slags, and belongs to the technical field of heavy metal arsenic pollution disposal and industrial solid waste comprehensive utilization. According to the method, the copper slags, the waste acid and an H2O2 solution are uniformly mixed, an arsenic precipitating reaction is carried out for 3-5 hours under a stirring condition of 70-90 DEG C to obtain a solid-liquid mixture A, and through solid-liquid separation, an arsenic-containing solid substance A and a filtrate A are obtained; the wasteacid is added into the filtrate A, air is continuously introduced under a stirring condition of 85 DEG C or above for 12-16 hours of an arsenic precipitating reaction to obtain a solid-liquid mixtureB, and solid-liquid separation is conducted to obtain an arsenic-containing solid substance B and a filtrate B; an alkaline substance is added into the filtrate B, the pH of the solution is adjusted to 7-8, and purification treatment is conducted to obtain industrial standard-reaching water. According to the method, the technological process is simple, the arsenic removal effect is significant, and the arsenic-containing solid substances are stable; the solid waste of a nonferrous metallurgy plant is comprehensively utilized for waste liquid disposal, and an efficient and low-cost method is provided for disposal of the heavy and nonferrous metallurgy smelting waste liquid.

Description

technical field [0001] The invention relates to a method for stepwise disposal of arsenic-containing polluted acid by using copper slag, and belongs to the technical field of heavy metal arsenic pollution control and industrial solid waste comprehensive utilization. Background technique [0002] In the heavy non-ferrous smelting process, when the smelting flue gas is washed before acid production, the heavy metal ions and insoluble impurities in the flue gas are enriched in the washing liquid to form dirty acid. Sewage acid has a large output, high acidity, and complex composition. It contains metal ions such as arsenic, copper, lead, zinc, cadmium, and bismuth. [0003] At present, the sewage acid treatment methods are mainly lime-iron salt method and sulfuration method. The lime-iron salt method has a simple process flow and good arsenic removal effect, but the amount of precipitant and slag is large, and the calcium and arsenic slag formed is unstable and highly toxic, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/5245C02F1/5236C02F1/00C02F2301/08C02F2101/103
Inventor 祁先进李永奎祝星王华李孔斋魏永刚胡建杭郝峰焱
Owner KUNMING UNIV OF SCI & TECH
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