阅读说明：本技术 一种非氰环保浸金剂 (Non-cyanogen environment-friendly gold leaching agent ) 是由 柯柏友 于 2021-06-23 设计创作，主要内容包括：本发明涉及一种非氰环保浸金剂,是一种有机氯溴化合物,化学名称：氯溴异氰尿酸,分子式：C-3HO-3N-3ClBr,为白色至微红色粉末,易溶于水,化学性质稳定,是一种高效、广谱杀菌剂,广泛应用于游泳池、鱼池、禽畜舍体外消毒及工业循环水杀菌除藻消毒。氯溴异氰尿酸溶解在水溶液中会释放出Cl和Br,形成次氯酸(HCIO)和次溴酸(HBrO)分子。次氯酸和次溴酸是强氧化剂,都有很好的浸溶金效果。通过在浸出液中添加氯盐,与浸出的金离子形成氯金络离子,从而减少氯溴异氰尿酸的使用量。生产实践证明,氯溴异氰尿酸有溶金速度快,浸出率高,对环保友好,安全高效的特点。(The invention relates to a non-cyanide environment-friendly gold leaching agent, which is an organic chlorine bromine compound with the chemical name: chlorobromoisocyanuric acid, molecular formula: c 3 HO 3 N 3 ClBr is white to reddish powder, is easy to dissolve in water, has stable chemical properties, is a high-efficiency and broad-spectrum bactericide, and is widely applied to in-vitro disinfection of swimming pools, fish ponds and livestock houses and sterilization, algae removal and disinfection of industrial circulating water. Chlorobromoisocyanuric acid, when dissolved in aqueous solution, releases Cl and Br, forming molecules of hypochlorous acid (hcoo) and hypobromous acid (HBrO). Hypochlorous acid and hypobromous acid are strong oxidants and have good gold leaching effect. By adding chloride salt into the leaching solution, chlorine-gold complex ions are formed with leached gold ions, so that the use amount of chlorobromoisocyanuric acid is reduced. Production practices prove that the chlorobromoisocyanuric acid has the characteristics of high gold dissolving speed, high leaching rate, environmental friendliness, safety and high efficiency.)

1. A non-cyanide environment-friendly gold leaching agent is characterized in that: is an organic chlorine bromine compound, the chemical name is chlorobromoisocyanuric acid, and the molecular formula is as follows: c₃HO₃N₃ClBr is white to reddish powder, is easy to dissolve in water, has stable chemical properties, is a high-efficiency and broad-spectrum bactericide, and is widely applied to in-vitro disinfection of swimming pools, fish ponds and livestock houses and sterilization, algae removal and disinfection of industrial circulating water. Chlorobromoisocyanuric acid, when dissolved in aqueous solution, releases Cl and Br, forming molecules of hypochlorous acid (hcoo) and hypobromous acid (HBrO). Hypochlorous and hypobromous acids are strong oxidizers,has good gold leaching effect. By adding chloride salt into the leaching solution, chlorine gold complex ions and silver complex ions are formed with leached gold ions and silver ions, so that the dosage of chlorobromoisocyanuric acid is reduced, and the leaching rate is improved. Practice proves that the chlorobromoisocyanuric acid has the characteristics of high gold leaching speed, high leaching rate, environmental friendliness, safety and high efficiency. Can overcome the problems of high toxicity, environmental pollution and diffuse leaching speed of sodium cyanide in the gold production by a cyanidation method.

2. The non-cyanide environment-friendly gold leaching agent as claimed in claim 1, wherein: the use concentration of the chlorobromoisocyanuric acid leaching agent is 0.05-5% (W/W).

3. The non-cyanide environment-friendly gold leaching agent as claimed in claim 1, wherein: the use environment of the chlorobromoisocyanuric acid leaching agent is between pH 1 and pH 7.

Technical Field

The invention relates to the field of wet metallurgy, in particular to a non-cyanide environment-friendly gold leaching agent.

Background

Cyanidation gold leaching has been developed for over 100 years and has long dominated the gold industry. The cyanidation method has simple gold extraction process, good adaptability, low production cost and high gold recovery rate, and is the main reason for the long-term adoption of the method by people. However, the gold leaching speed is slow, the period is long, and the leaching process is easily interfered by harmful impurities; the sodium cyanide is extremely toxic, seriously endangers the life of people and livestock, pollutes the ecological environment and has high environmental protection cost for mines. Since the 70 s in the 20 th century, many researches and researches on non-cyanide gold extraction methods have been made at home and abroad, and various gold extraction methods such as thiourea method, lime-sulfur method, thiosulfate method, thiocyanate method, chlorination method, hydrochlorination method, liquid chlorine method, bromination method, iodination method and the like have been developed. The methods have the advantages of no toxicity or low toxicity compared with cyanide, high leaching speed, strong adaptability to impurities and the like, but the methods have certain limitations to different degrees, such as the defects of high medicament consumption, difficult control in production, high production cost and the like, are still to be further perfected, and particularly need to enhance industrial experimental research, so that the methods cannot be popularized and applied in a large scale by actually replacing a cyanidation method in the gold industrial production.

With the stricter environmental requirements, enterprises are forced to accelerate the research of green environmental protection production technology while controlling the environmental pollution caused by gold production, and the gold production industry is promoted to develop towards the development and application of pollution-free or less-pollution gold extraction technology. Therefore, the development of the research of the gold leaching agent with more environmental protection and high efficiency has great economic significance and environmental ecological significance.

Disclosure of Invention

In order to overcome the limitations and the defects of the existing gold leaching agent, the invention provides a non-cyanide environment-friendly gold leaching agent, which is an organic chlorine bromine compound with the chemical name: chlorobromoisocyanuric acid, molecular formula: c₃HO₃N₃ClBr is white to reddish powder, is easy to dissolve in water, has stable chemical properties, and chlorobromoisocyanuric acid is a high-efficiency and broad-spectrum bactericide and is widely applied to in-vitro disinfection of swimming pools, fish ponds and livestock houses and sterilization and algae removal disinfection of industrial circulating water. The mechanism of action is that chlorobromoisocyanuric acid is dissolved in an aqueous solution to release Cl and Br, and hypochlorous acid (HCIO) and hypobromous acid (HBrO) molecules are formed. Hypochlorous acid and hypobromous acid are strong oxidants and have good gold leaching effect. By adding chloride salt into the leaching solution, chlorine-gold complex ions are formed with the leached gold ions, so that the use amount of chlorobromoisocyanuric acid is reduced, and the leaching rate is improved. Practice proves that the chlorobromoisocyanuric acid has the characteristics of high gold leaching speed, high leaching rate, environmental protection, safety and high efficiency. Can overcome the problems of high toxicity, environmental pollution and diffuse leaching speed of sodium cyanide in the gold production by a cyanidation method.

The usage concentration of the non-cyanide environment-friendly gold leaching agent chlorobromoisocyanuric acid is 0.05-5% (W/W), and the preferable usage concentration is 0.1-3%.

The environment for using the non-cyanide environment-friendly gold leaching agent chlorobromoisocyanuric acid is between pH 1 and 7, and the preferable environment for using the non-cyanide environment-friendly gold leaching agent is between pH 2 and 5.

It is known that bromine and chlorine are halogen elements, have relatively similar chemical properties, react with most elements in aqueous solution, have higher affinity for metals with higher density than for metals with lower density, are both oxidizing agents and complexing agents for gold and silver, have high gold dissolving capacity, and can economically and effectively leach gold from refractory ores (or concentrates). Can be used in weakly acidic to neutral solution. The dilute solution is nontoxic, has the function of biodegradation and decomposition, and is a good substitute of the traditional sodium cyanide gold leaching agent. Can reach a fast leaching speed, and the leaching rate of 90 percent can be reached when most ores are leached by the leaching agent for 6 hours. And the chlorobromoisocyanuric acid is used as a gold leaching agent, has better gold leaching effect than a single chlorine or bromine compound, has the effect that 1+1 is more than 2, and is more ideal.

The invention has the advantages that: in industrial gold production, the gold leaching agent chlorobromoisocyanuric acid and sodium cyanide are consumed in a small amount, the usage amount is small, the sodium chloride with large addition amount is cheap, and the gold leaching agent is recycled through circulating water and only needs to be supplemented in a small amount. Therefore, the production cost of the chlorobromoisocyanuric acid gold leaching method is not much different from that of the cyanidation method, the leaching rate can be equal to or even higher than that of the cyanidation method, and the chlorobromoisocyanuric acid gold leaching method has the advantages of no toxicity, no environmental pollution, high gold leaching speed and the like. The method overcomes the defects of the prior noble metal extracting and selecting agent technology such as high toxicity, environmental pollution and the like in the gold sodium cyanide production by a cyanidation method, so the advancement of the method is clear at a glance.

Detailed Description

The leaching method of non-cyanide environment-protecting gold-leaching agent is characterized by that according to the components and properties of mineral the concentrations of chlorobromoisocyanuric acid and sodium chloride required for leaching are set, according to the required ore-grinding fineness and solid-liquid ratio the raw material is placed in a leaching container, the sodium chloride solution is added, a stirrer is started, the acid is used to regulate set pH value, according to the set dosage concentration of chemical agent the chlorobromoisocyanuric acid reagent is directly added into the ore pulp, and the action of leaching gold and silver can be implemented immediately. After leaching, solid-liquid separation is carried out, and the leaching solution is absorbed and recovered by gold and silver absorbing resin.

The invention is illustrated by the following specific examples.

Example 1

The property of a gold mine is gold oxide ore, and valuable metal components: au3.5g/t, Ag105 g/t; setting leaching conditions: 0.1% (W/W) of chlorobromoisocyanuric acid, 10% (W/W) of NaCI, 5 of PH value and 1: 5 of solid-to-liquid ratio S: L; grinding the ore until the ore accounts for 90 percent in a range of-200 meshes, adding sodium chloride into the ore pulp according to the setting to ensure that the concentration of the sodium chloride is 10 percent, adjusting the solid-to-liquid ratio to be 1: 5, adding sulfuric acid to adjust the pH value to be about 5, adding chlorobromoisocyanuric acid powder according to the concentration of 0.1 percent, stirring and leaching for 6 hours, after the leaching is finished, carrying out solid-liquid separation by a filter press, adsorbing and recovering gold and silver in the leaching solution by using gold-adsorbing resin, and testing tailings to ensure that the leaching rate is Au93.8 percent and Ag82.3 percent.

Example 2

The property of a certain gold mine mineral is low-grade oxidized gold mine, and the valuable metal components are as follows: au0.91g/t; setting leaching conditions: 0.1% (W/W) of chlorobromoisocyanuric acid, 5% (W/W) of NaCI, 6 of PH value and 1: 5 of solid-to-liquid ratio; grinding ore until the ore accounts for 85% in a range of-200 meshes, adding sodium chloride into the ore pulp according to the setting to ensure that the concentration of the sodium chloride is 5%, adjusting the solid-to-liquid ratio to be 1: 5, adding sulfuric acid to adjust the pH value to be about 6, adding chlorobromoisocyanuric acid powder according to the concentration of 0.1%, stirring and leaching for 4 hours, after the leaching is finished, performing solid-liquid separation by using a filter press, adsorbing and recovering gold in the leaching solution by using gold-adsorbing resin, and inspecting tailings to ensure that the leaching rate is Au75.7%.

Example 4

The oxidation roasting sand of the gold-copper flotation concentrate of a certain gold smelting plant has valuable metal components: au53.7g/t, Ag95g/t, Cu9.6%; setting leaching conditions: 0.5% (W/W) of chlorobromoisocyanuric acid, 10% (W/W) of NaCI, 4 of PH value and 1: 6 of solid-to-liquid ratio S: L; grinding the ore again by a vertical mill until the ore accounts for 90 percent in a size of-300 meshes, adding sodium chloride into the ore pulp according to the setting to ensure that the concentration of the sodium chloride is 10 percent, adjusting the solid-to-liquid ratio to be 1: 6, adding sulfuric acid to adjust the pH value to be about 3, adding chlorobromoisocyanuric acid powder according to the concentration of 0.5 percent, stirring and leaching for 6 hours, after the solid-liquid separation by a filter press is finished, adsorbing gold and silver in the leaching solution by gold-adsorbing resin, replacing copper by reduced iron powder, and testing the leaching rate of tailings to be: au93.3%, Ag91.5% and Cu93.2%.

Example 5

The flotation gold concentrate oxidizing roasting sand of a certain smelting plant comprises the following valuable metal components: au51.3g/t, Ag395g/t, Cu3.61%, Pb3.54%, Zu2.81%; setting leaching conditions: 1% (W/W) of chlorobromoisocyanuric acid, 25% (W/W) of NaCI, 2.5 of PH value and 1: 6 of solid-liquid ratio S: L; grinding the ore again by a vertical mill until the ore accounts for 90 percent in a size of-300 meshes, adding sodium chloride into the ore pulp according to the setting to ensure that the concentration of the sodium chloride is 25 percent, adjusting the solid-to-liquid ratio to be 1: 6, adding sulfuric acid to adjust the pH value to be about 3, adding chlorobromoisocyanuric acid powder according to the concentration of 1 percent, stirring and leaching for 8 hours, after the solid-liquid separation by a filter press is finished, adsorbing gold and silver in the leaching solution by gold-absorbing resin, replacing copper by reduced iron powder, and testing the leaching rate of tailings to be: au92.7%, Ag90.3%, Cu92.8%, Pb89.5%, and Zu92.1%. The test data show that the reagent can comprehensively leach and recover valuable metals.

Example 6

Comparison test of non-cyanide environment-friendly gold leaching agent and sodium cyanide gold leaching agent

The test material is from flotation concentrate of gold ore in Shandong. The gold ore is in a fine-vein dip-dyed yellow iron sericite cracked rock type, a fine-vein or net-vein yellow iron sericite cracked granite cracked rock type, a fine-vein yellow iron sericite cracked granite spangle type and the like. The main chemical components of the raw materials are shown in table 1, and the main mineral compositions are shown in table 2.

TABLE 1 main chemical composition of test gold mine

Note: the unit of a is g/t.

TABLE 2 main mineral composition of test gold ores

The test method comprises the following steps:

1. the non-cyanide environment-friendly gold leaching agent leaching method comprises the following steps: ore pulp of the gold concentrate is adjusted according to the solid-liquid ratio of 1: 5; adding a reagent according to the dosage of 0.5% (W/W) of chlorobromoisocyanuric acid and 10% (W/W) of NaCI, adjusting the pH value to 3 by using sulfuric acid, stirring and leaching for 8h, after the leaching is finished, carrying out solid-liquid separation by using a filter press, adsorbing and recovering gold and silver in the leaching solution by using gold-adsorbing resin, and replacing copper by reduced iron. And (3) test results: au93.9%, Ag91.5% and Cu93.7%.

2. Cyanidation: ore pulp of the gold concentrate is adjusted according to the solid-liquid ratio of 1: 4; adjusting the pH value of ore pulp to 10-11 by using hydrated lime, adding sodium cyanide according to the dosage of 0.9%, adding 300g/t of self-prepared auxiliary leaching agent CFZ-S auxiliary agent according to the same proportion, stirring and leaching for 24h, after the leaching is finished, carrying out solid-liquid separation by using a filter press, adsorbing and recovering gold and silver in the leaching solution by using gold-adsorbing resin, and replacing copper by using reduced iron. And (3) test results: au92.1%, Ag89.0% and Cu71.2%.

The test results show that the gold leaching effect of the non-cyanide environment-friendly gold leaching agent is superior to that of sodium cyanide. And the method has the advantages of low toxicity, environmental protection, no harm to human and livestock, no need of harmless treatment on tailings and tail liquid, and production cost saving. With the further enhancement of the consciousness of our country on the environmental protection, the gold industry also adheres to the development of the policy of combining with the environmental protection, puts economic benefits, social benefits and ecological benefits at the same important position, and is urgent to research and develop the non-cyanogen environmental-friendly gold leaching agent with high performance and high market prospect. The excellent performance of the non-cyanide environment-friendly gold leaching agent inevitably brings better economic and social benefits for the country and the society.

In summary, the preferred embodiments of the present invention are described above, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and equivalents and modifications of the technical solutions and concepts of the present invention should be included in the scope of the present invention.