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A method for improving the transparency of acid production from secondary roasting flue gas of cyanidation tailings

A technology for producing acid from cyanide tailings and flue gas is applied in chemical instruments and methods, improvement of process efficiency, nitrogen oxides/oxygen acids, etc., to achieve the effects of high utilization rate of raw materials, simple operation steps, and improved transparency.

Active Publication Date: 2017-07-11
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there will be a phenomenon that the red sulfuric acid sample becomes colorless and transparent after being placed for a period of time and forms a colorless precipitate

Method used

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  • A method for improving the transparency of acid production from secondary roasting flue gas of cyanidation tailings
  • A method for improving the transparency of acid production from secondary roasting flue gas of cyanidation tailings

Examples

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Effect test

Embodiment 1

[0025] A method for improving the transparency of acid production from secondary roasting flue gas of cyanidation tailings, comprising the steps of:

[0026] 1) Decyanation of cyanide tailings: put the cyanide tailings produced by the second-stage roasting cyanation process containing 380mg / t of cyanide in an oven at 40°C for 1 hour to reduce cyanide and moisture, and the cyanide root is initially reduced to 310mg / t , the moisture content is reduced to 19wt%, and it is pressed into pellets with a diameter of 5mm by using a hydraulic pellet machine, and placed in a rotary kiln at 260°C for 5 hours to remove cyanide, and the cyanide content of the cyanide tailings after roasting is further reduced to 0.5 mg / t, the moisture content is 8wt%, and the water vapor containing cyanide is collected in the dilute acid reaction tank;

[0027] 2) Desulfurization by ore blending: after decyanation, the pellets and high-sulfur ore with a sulfur content of 38wt% are blended according to a mas...

Embodiment 2

[0035] A method for improving the transparency of acid production from secondary roasting flue gas of cyanidation tailings, comprising the steps of:

[0036] 1) Decyanation of cyanide tailings: The cyanide tailings produced by the second-stage roasting cyanation process containing cyanide 406mg / t were placed in the air at 30°C for 3 hours to reduce cyanide and moisture, and the cyanide was initially reduced to 345mg / t t, moisture content is reduced to 21wt%, utilizes the hydraulic pressure ball machine to press into the pellet that diameter is 8mm, puts in the rotary kiln of 280 ℃ and roasts 3 hours decyanation, the cyanide radical content of the cyanide tailings after roasting is further reduced to 1.0mg / t, moisture content 9.5wt%, the water vapor containing cyanide is collected in dilute acid reaction pool;

[0037] 2) Desulfurization by ore blending: after decyanation, the pellets and high-sulfur ore with a sulfur content of 44wt% are blended according to a mass ratio of 1:...

Embodiment 3

[0045] A method for improving the transparency of acid production from secondary roasting flue gas of cyanidation tailings, comprising the steps of:

[0046] 1) Decyanation of cyanide tailings: The cyanide tailings produced by the second-stage roasting cyanation process and containing 430mg / t of cyanide are placed in the air at 20°C for 8 hours to reduce cyanide and moisture, and the cyanide is initially reduced to 380mg / t t, moisture content is reduced to 23wt%, utilizes the hydraulic pressure ball machine to press into the pellet that diameter is 10mm, puts in the rotary kiln of 300 ℃ and roasts 2 hours decyanation, the cyanide radical content of the cyanide tailings after roasting is further reduced to 1.5mg / t, moisture content 11wt%, the water vapor containing cyanide is collected in dilute acid reaction pool;

[0047] 2) Desulfurization by ore blending: after decyanation, the pellets and high-sulfur ore with a sulfur content of 49wt% are blended according to the mass rati...

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Abstract

The present invention relates to a method for improving the transparency of an acid prepared from secondary baking flue gas of cyanidation tailings. The method comprises the steps of cyanidation tailing decyanation, ore blending desulphurization, flue gas oxidation dissolution, initial sulfuric acid production, oxidative decomposition of residual nitrogen oxide and the like. The method provided by the present invention has the beneficial effects that 1) the cyanide content is reduced by sunshine exposure, baking, or roasting, and NOx is selectively oxidized by selecting a suitable oxidizing agent, reaction temperature, and reaction time to separate NOx from SO2, so that the transparency of a sulfuric acid product is ultimately improved while the operation steps are simple and easy to implement; and 2) the utilization rate of raw materials is high, almost no waste is discharged, the method is green and environmentally friendly; and the method is not harmful to the environment.

Description

technical field [0001] The invention relates to a method for improving the transparency of acid production from flue gas of secondary roasting of cyanidation tailings, and belongs to the technical fields of gold smelting and sulfuric acid chemical industry. Background technique [0002] In order to improve the value of the comprehensive recycling of cyanide tailings, the usual method is to remix the cyanide tailings into sulfur-containing gold concentrate and then roast them. Because the cyanide tailings contain a certain amount of cyanide, during the roasting process After being decomposed, SO 2 When mixed into the acid system, nitrogen oxides will be formed, which will cause the sulfuric acid to turn red and affect the transparency index of sulfuric acid. The transparency index value is usually 40-45mm, which will reduce the quality of sulfuric acid. At the same time, when sulfuric acid contains nitrogen oxides, sulfuric acid reacts with iron to form ferrous sulfate nitra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/76C01B21/40C22B11/08
CPCY02P10/20
Inventor 康雯诚孔令强
Owner SHANDONG GUODA GOLD
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