Treatment method of mineral separation volatile gas

Abstract

The invention belongs to the field of smelting, and particularly relates to a treatment method of mineral separation volatile gas, which comprises the following steps: collecting gas volatilized from a mineral separation tank, incinerating, and conveying the incinerated gas to an existing flue gas acid-making system for treatment. According to the scheme, volatile gas generated by reagent reaction during mineral separation is collected and then subjected to high-temperature incineration treatment, and sulfur dioxide and carbon dioxide are produced after carbon disulfide is subjected to high-temperature combustion; hydrogen sulfide is decomposed into water and sulfur dioxide after high-temperature combustion, and sulfur dioxide is an atmospheric pollutant and can be treated by an existing flue gas acid making system. According to the scheme, the peculiar smell of the volatile gas can be eliminated in the most efficient and clean manner by utilizing the existing equipment and facilities, and the gas treatment pressure is not increased for enterprises.

Description

Technical Field

[0001] The invention belongs to the field of smelting, and in particular relates to a method for treating volatile gas in mineral processing. Background Art

[0002] Mineral processing agents are used in the mineral processing of smelting enterprises, mainly xanthate and pine oil. A large amount of volatile gases with pungent odors will be generated during the preparation and addition of the agents. The main components are carbon disulfide and a small amount of hydrogen sulfide. If these volatile gases are not collected and treated, and allowed to dissipate in an unorganized manner, the following effects will be brought about: ① Cause complaints from surrounding residents. Since there are many residents around the company, the escaped odorous gases are likely to cause complaints from residents. ② Affect the surrounding air quality and occupational working environment. Xanthate gas has an unpleasant smell of rotten radish. Unorganized emissions are likely to affect the air quality around the factory area and the working environment of employees in the grinding and flotation plant. However, there is no effective way to solve the above problems in the prior art. Summary of the invention

[0003] The purpose of the present invention is to provide a method for treating volatile gases in mineral processing, so as to collect and treat the irritating gases volatilized from flotation reagents to avoid environmental pollution.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a method for treating volatile gases in ore dressing, collecting and incinerating the gases volatilized in the ore dressing tank, and conveying the incinerated gases to the existing flue gas acid-making system for treatment.

[0005] The preferred solution is to directly transport the collected volatile gas to a smelting furnace that is carrying out pyrometallurgy, and introduce air or oxygen. The smelting furnace is at least one of a flash furnace, a converter, a shaft furnace, and an anode furnace. The air intake of the volatile gas into the smelting furnace is: 8000-10000m3 for a flash furnace; 3 / h, or converter 2000~6000m 3 / h, or anode furnace 2000~5000m 3 / h, or vertical furnace 1500~6500m 3 / h.

[0006] The above scheme uses the volatile gas (CS 2 and H 2 S) is collected and incinerated at high temperature to obtain carbon disulfide (CS 2 ) produces sulfur dioxide (SO 2 ) and carbon dioxide (CO 2 );Hydrogen sulfide (H 2 S) decomposes into water (H 2 O) and sulfur dioxide (SO 2), sulfur dioxide is an air pollutant that can be treated using the existing flue gas acid system. This solution can use existing equipment and facilities to eliminate volatile gas odors in the most efficient and clean way without adding gas treatment pressure to the enterprise. DETAILED DESCRIPTION

[0007] The technical solution of the present invention is further described below.

[0008] Example

[0009] The smelting slag enters the slag beneficiation stage. Some reagents (xanthate and pine oil) are added during the grinding process, and some are added in the flotation tank. However, since the grinding equipment is closed, the volatile gases with pungent odor are mainly collected in the flotation tank.

[0010] The odorous gas collected by negative pressure is transported to the converter of pyrometallurgy through the air duct, with an air intake of 3000m 3 / h. Since most of the collected gas is air, it already contains enough oxygen, so there is no need to introduce oxygen into the furnace. If you want to ensure the combustion effect, you can also introduce oxygen appropriately. The temperature in the converter is 1250℃. After the volatile gas is introduced into the converter, it will burn naturally at high temperature without providing other conditions. The reactions that occur are:

[0011] CS 2 +3O 2 =CO 2 +2SO 2

[0012] 2H 2 S+3O 2 =2SO 2 +2H 2 O

[0013] The flue gas generated after combustion enters the flue gas acid-making system. Since the flue gas generated by the converter also contains sulfur dioxide, it needs to enter the flue gas acid-making system. Therefore, the flue gas such as sulfur dioxide generated after the high-temperature incineration of volatile gases is also processed for acid-making. In addition, the processing pressure of the flue gas acid-making system is not increased while controlling the amount of volatile gases entering the converter. The flue gas treatment process after combustion does not bring additional processing steps and does not increase the work pressure of the operators.

[0014] Replace the smelting furnace that processes volatile gases with an anode furnace, flash furnace, vertical furnace, etc. The gas volume is controlled according to the type of smelting furnace:

[0015] ①Flash furnace: 8000-10000m 3 / h;

[0016] ②Converter: 2000-6000m3 / h;

[0017] ③Anode furnace: 2000-5000m 3 / h;

[0018] ④ Vertical furnace: 1500-6500m 3 / h.

[0019] Since the smelting temperature of the above-mentioned smelting furnace is relatively high, it meets the incineration conditions of volatile gases, and the flue gas produced by the above-mentioned smelting furnace itself also needs to be introduced into the flue gas acid-making system for treatment. No additional work is added after the introduction of the volatile gas. Therefore, except for the collection step, it can be said that the technical solution of the present invention realizes the cost-free treatment of volatile gases in mineral processing.

Claims

1. A method for treating volatile gases from mineral processing, characterized in that: The volatilized gas in the beneficiation tank is collected and incinerated, and the incinerated gas is transported to the existing flue gas acid system for treatment.

2. The method for treating volatile gas from mineral processing according to claim 1, characterized in that: The collected volatile gases are directly transported to the smelting furnace where pyrometallurgy is being carried out, and air or oxygen is introduced at the same time.

3. The method for treating volatile gas from mineral processing according to claim 2, characterized in that: The smelting furnace is at least one of a flash furnace, a converter, a shaft furnace and an anode furnace.

4. The method for treating volatile gas from mineral processing according to claim 3, characterized in that: The intake volume of the volatile gas into the smelting furnace is: 8000~10000m 3 / h, or converter 2000~6000m 3 / h, or anode furnace 2000~5000m 3 / h, or vertical furnace 1500~6500m 3 / h.