2Au十3Br2 +2Br--- > 2AuBra
人类有目的地采用生物技术从矿物中直接或间接提取有用金属。根据生物作用于目的矿物的过程与结果的不同，生物对矿物的氧化过程可以分为两类:生物浸出(Bio eching)和生物氧化CBio oidtin).生物浸出是指利用细菌对含有目的元素的矿物进行氧化,被氧化后的目的元素以离子状态进入溶液中，然后对浸出的溶液近一步进行处理， 从中提取有用元素，浸渣被玉弃。如细菌对铜、锌、铀、镍、钻等硫化矿物的氧化,即属于生物浸出。生物氧化是指利用细菌对包裹目的矿物(或元素)的非目的矿物进行氧化，被氧化后的非目的矿物以离子状态进入溶液中，溶液被丢弃处理，而目的可物(成元素)或被解离，或呈裸露状态仍留存于氧化 渣浆泵
What is the liquid chlorine leaching method for the overflow part of slurry pump?
安徽快3开奖结果Liquid chlorination, also known as water solution chlorination or water chlorination. In the initial stage of this method, gold was successfully leached from the solution with cyanogen water or sulfuric acid plus bleaching powder, and gold was precipitated from the leached solution with ferrous sulfate. Generally speaking, all the substances soluble in aqua regia in raw materials can also be dissolved by liquid cyanidation. The leaching rate of gold is higher and the price of chlorine is lower than that of cyanide.
Chlorine is a strong oxidant and can react with most elements. For gold, it is both a water oxidizer and a complexing agent. Gold is oxidized by chlorination and complexed with chlorine, so it is called water chlorination leaching gold. Its chemical reaction is
The reaction was carried out rapidly under the condition of low pH, when the concentration of chlorine in the solution increased obviously.
The main leachables used in liquid oxidation are (wet) chlorine and chloride salts. Because of the activity of chlorine
Very high, there is no passivation problem on the surface of gold particles. Therefore, under the given conditions, the leaching rate of gold is very fast, generally only 1 ~ 2H. This method is more suitable for the treatment of carbonaceous gold ore, acid washed gold bearing ore, antimony slag, arsenic bearing concentrate or ore.
What is electrochlorination leaching?
In aqueous solution, gold can be combined with chlorination to form soluble gold chloride, thus a chlorination leaching method of gold ore is proposed. Chlorine is the leaching agent of gold ore. The further development of chloride leaching is the leaching of gold from ores by chlorine obtained from electrolytic sodium chloride solution. This electrochemical leaching method is also called electrochlorination leaching method, which leaches gold from ore and leaches gold from solution.
When electrolyzing sodium chloride solution in the membrane electrolyzer, H + discharges gaseous hydrogen on the cathode, and CI - discharges gaseous gas on the anode。 Oh - may also release O2 on the anode。
The atomic chlorine or molecular chlorine produced in the process has strong oxidation effect on gold. Chlorine dissolves in the salt solution to form hypochlorite. When the solution is alkaline, it will form hypochlorite which is easy to decompose.
In the process of electrochemical leaching of gold ores, the gaseous chlorine and oxygen consumed in the process are continuously supplemented due to the salt spot decomposition, which promotes the leaching reaction to proceed rapidly. The dissolution process of gold is also a diffusion process. The leaching rate of gold is affected by stirring intensity and temperature. Generally, the increase of temperature is favorable for gold leaching, but when the temperature is higher than 40C, the gold leaching rate will be significantly reduced. If the stirring intensity is too high, chlorine will permeate the cathode liquid, alkali will permeate the anode liquid, or a large amount of molecular chlorine will volatilize, resulting in excessive oxygen in the solution and passivation of gold in the ore.
What is bromination leaching?
Bromine and chlorine are both halogens. They have similar chemical properties. Bromination
安徽快3开奖结果The extraction method is similar to the chlorination leaching method, but there are some important differences between them. Bromine in its elemental form is a dense, smoky red liquid, while chlorine in its elemental form is a gas and requires a large number of equipment to transport, store and convert it into a liquid. A great advantage of bromine can be attributed to its fast leaching speed, innocuity, strong adaptability to pH change and low cost of environmental protection facilities.
The dissolution of gold in bromine bromide solution is an electrochemical process
2au x 3Br2 + 2Br --- > 2aubra
At room temperature, the best gold dissolving region is pH 4 ~ 6, potential 0。7 ~ ~ 0。9V。
What is the leaching of gold by propionitrile?
Cnch2cn, also known as Cyanomethane, is colorless, crystalline, toxic, soluble in water, alcohol, ether and benzene, and can form anions in alkaline solutions
This complex is larger than that of gold cyanogen complex, which often exceeds the internal pores of carbonaceous particles and reduces the adsorption rate of carbon. Therefore, the leaching rate of gold from carbonaceous ores by malondionitrile can be higher.
What is bioleaching and biooxidation?
Human beings purposefully use biotechnology to extract useful metals directly or indirectly from minerals。 According to the different processes and results of biological action on the target minerals, the biological oxidation processes of minerals can be divided into two categories: bioleaching and biooxidation CBIO oidin。 Bioleaching refers to the use of bacteria to oxidize the minerals containing the target elements, the target elements after being oxygenated enter the solution in the form of ions, and then the leached solution is treated in the next step The useful elements are extracted from it and the dregs are discarded by jade。 For example, the oxidation of sulfide minerals such as copper, zinc, uranium, nickel and diamond by bacteria belongs to bioleaching。 Biological oxidation refers to the use of bacteria to oxidize the non-target minerals (or elements) that surround the target minerals。 After being oxidized, the non-target minerals enter the solution in an ionic state, and the solution is discarded for treatment, while the target minerals (as elements) are dissociated, or remain in the exposed state in the oxidation slag slurry pump