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Nonferrous metallurgy arsenic-containing impure acid harmless disposal method

A disposal method and technology of arsenic polluted acid, applied in chemical instruments and methods, water/sewage treatment, neutralized water/sewage treatment, etc., to achieve the effect of low cost of treating polluted acid

Inactive Publication Date: 2020-02-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems and deficiencies in the above-mentioned existing technology, the present invention provides a method for harmless disposal of arsenic-containing sewage acid in non-ferrous smelting. the purpose of

Method used

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  • Nonferrous metallurgy arsenic-containing impure acid harmless disposal method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The harmless disposal method of the non-ferrous smelting arsenic-containing sewage acid is as follows:

[0022] (1) The laterite nickel ore (composition shown in Table 1) is subjected to dry ball milling and magnetic separation (the speed of the ball mill is 740r / min, the grinding time is 11min, and the magnetic separation intensity of the magnetic separator is 700mT) to obtain iron-rich nickel ore and other impurities, and other impurities are piled up for treatment;

[0023] Table 1

[0024]

[0025] (2) According to the ratio of iron:arsenic molar ratio of 2.5:1, according to H 2 o 2 : The molar ratio of arsenic is 1:1, and the iron-rich nickel ore, polluted acid and H 2 o 2 The solution was uniformly mixed, and the arsenic precipitation reaction was carried out at 70°C and 180r / min stirring conditions for 10 hours to obtain a solid-liquid mixture A, which was separated to obtain arsenic-containing solid A and filtrate A; the dirty acid came from...

Embodiment 2

[0032] Embodiment 2: The harmless disposal method of the non-ferrous smelting arsenic-containing sewage acid is as follows:

[0033] (1) The laterite nickel ore (composition shown in Table 4) is subjected to dry ball milling and magnetic separation (the speed of the ball mill is 860r / min, the grinding time is 9min, and the magnetic separation intensity of the magnetic separator is 900mT) to obtain iron-rich nickel ore and other impurities, and other impurities are piled up for treatment;

[0034] Table 4

[0035]

[0036] (2) According to the ratio of iron:arsenic molar ratio of 3:1, according to H 2 o 2 : The molar ratio of arsenic is 1.2:1, and the iron-rich nickel ore, polluted acid and H 2 o 2 The solution was uniformly mixed, and the arsenic precipitation reaction was carried out under the condition of 80°C and 200r / min stirring for 11 hours to obtain a solid-liquid mixture A, and the solid-liquid separation obtained arsenic-containing solid A and filtrate A; the p...

Embodiment 3

[0043] Embodiment 3: The harmless disposal method of the non-ferrous smelting arsenic-containing sewage acid is as follows:

[0044] (1) Dry the laterite nickel ore (the composition is shown in Table 7) to dry ball mill magnetic separation (the speed of the ball mill is 900r / min, the grinding time is 7min, and the magnetic separation intensity of the magnetic separator is 1000mT) to obtain iron-rich nickel ore and other impurities, and other impurities are piled up for treatment;

[0045] Table 7

[0046]

[0047] (2) According to the ratio of iron:arsenic molar ratio of 3.5:1, according to H 2 o 2 : The molar ratio of arsenic is 1.6:1, and the iron-rich nickel ore, polluted acid and H 2 o 2 The solution was uniformly mixed, and the arsenic precipitation reaction was carried out under the condition of 80°C and 220r / min stirring for 12 hours to obtain a solid-liquid mixture A, and the solid-liquid separation obtained arsenic-containing solid A and filtrate A; the pollute...

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Abstract

The invention discloses a nonferrous metallurgy arsenic-containing impure acid harmless disposal method, and belongs to the field of heavy metal wastewater treatment. Laterite nickel ore is subjectedto drying, ball milling, and magnetic separation to obtain an iron-rich nickel ore and other impurities; the iron-rich nickel ore, the impure acid, and a H2O2 solution are mixed uniformly, an arsenicprecipitation reaction is performed at a temperature of 70 DEG C to 90 DEG C under the stirring condition for 10 to 12 h to obtain a solid-liquid mixture A, and solid-liquid separation is performed toobtain an arsenic-containing solid substance A and a filtrate A; arsenic-containing solid substance A is subjected to drying and magnetic separation to obtain an arsenic-containing solid B and a fresh iron-rich nickel ore C; then the fresh iron-rich nickel ore C is mixed with the filtrate A and subjected to a stirring reaction at atmospheric pressure for 3 to 4 h, and an alkaline oxidant is addedto adjust the pH of the solution to 9 to 11, and purification treatment is conducted to obtain industrial-standard water. The method has simple process flow, the arsenic removal effect is obvious, and the arsenic-containing solid is stable; and the cheap laterite nickel ore is utilized to remove arsenic, and the efficient and low-cost method is provided for the heavy nonferrous metallurgy impureacid treatment.

Description

technical field [0001] The invention relates to a method for harmless disposal of arsenic-containing sewage acid from non-ferrous smelting, belonging to the field of heavy metal sewage treatment. [0002] technical background [0003] During the smelting process of heavy non-ferrous metals, most of the arsenic in the arsenic-containing sulfide concentrate enters into the flue gas of sulfur dioxide in the pyrometallurgy process. The flue gas washing and cleaning process before the acid is removed and enriched in the washing acid waste water, which is commonly referred to as dirty acid. Sewage acid contains harmful impurities such as arsenic, fluorine, and chlorine, as well as various heavy metal elements. It has the characteristics of complex composition, strong toxicity, large discharge volume, and difficult disposal. It is an important source of pollution in heavy non-ferrous smelting. [0004] At present, the sewage acid treatment processes are mainly lime-iron salt method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/20C02F103/18
CPCC02F9/00C02F1/722C02F1/66C02F1/281C02F2101/103C02F2101/20C02F2103/18
Inventor 祁先进李永奎祝星郝峰焱李雪竹卢治旭王华李孔斋魏永刚胡建杭
Owner KUNMING UNIV OF SCI & TECH
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