a use i 2 How to refine gold with nai
A technology of gold and gold powder, which is applied in the field of metal smelting, can solve the problems of high processing cost, high concentration of HCl, and high processing difficulty, and achieve the effect of low safety risk, high product quality and technical feasibility
Active Publication Date: 2017-08-25
龙岩环美新材料科技有限公司
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Problems solved by technology
Among them, the aqua regia method and the extraction method have similar disadvantages: the amount of waste gas is large, and the treatment is difficult; the amount of waste water is large, the concentration of HCl is high, and the treatment cost is high; when the chlorination method is used, the amount of waste gas and waste water is large, and the treatment cost is high. The investment is large, and the raw materials contain chlorine gas, so there are great safety hazards; the amount of waste water and waste gas produced by the electrolysis method is small, and the treatment cost is low, but there is a large backlog of gold, the refining cycle is long, and the production cost is high
[0007] It can be seen from the above table that these four gold refining methods have certain limitations, which hinder their further application in industry. Therefore, there is an urgent need to develop a new gold refining method
Method used
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Embodiment 1
[0032] (1) Atomized pulverization: adopt JTSWH-30 high-pressure water atomized pulverization equipment to melt the coarse gold, and use high-pressure water flow to atomize and solidify it for 40-60 minutes to obtain gold powder with a particle size of ≤60 mesh .
[0033] (2) Dissolving: the gold powder that step (1) obtains is added in the reactor that iodine simple substance and NaI are housed, adds ion-exchanged water, stirs and leaches, makes gold powder dissolve completely, obtains NaAuI 4 solution; the reaction formula is: 2Au+3I 2 +2NaI=2NaAuI 4 ; Among them, the ratio of the amount of gold powder, iodine element, NaI and ion-exchanged water is 1kg: 2kg: 3.1kg: (6-10L); the reaction temperature is 40-55°C, the stirring speed is 120r / min, and the leaching time is 80 -120min.
[0034] (3) Filtration: use 1.0×10 -2 The sodium hydroxide solution of M adjusts the pH value of the solution to 8.5-9.0, removes insoluble AgI and other metal impurities by filtration, and the f...
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Abstract
The invention belongs to the technical field of metal smelting and particularly relates to a method for refining gold through I2 and NaI. The method comprises the steps of powder atomization, dissolution, filtration, reduction and electrolysis. By means of the method, waste gas and waste water are avoided, the refining period is only 3-5 hours, only electric energy is needed, safety risks are low, and the purity of obtained gold can reach 99.995%; the purposes of being environmental friendly, economical, reasonable, feasible in technology, safe in operation and high in product quality are really achieved, and the method is the best choice of non-pollution gold metallurgy.
Description
technical field [0001] The invention belongs to the technical field of metal smelting, in particular to a method using I 2 A method of refining gold with NaI. Background technique [0002] For most gold production enterprises, the purity of gold products produced by traditional smelting processes can no longer meet the requirements. In order to adapt to market changes as soon as possible and create more economic benefits, the company is actively planning to update the technology of smelting process, adopt advanced gold refining technology, and promote the product upgrade of the company. Therefore, the research, development and application of gold refining technology are increasingly valued by gold production enterprises. [0003] At present, the methods used for gold refining mainly include four methods: aqua regia method, chlorination method (Boliden process), extraction method, and electrolysis method. Among them, the aqua regia method and the extraction method have sim...
Claims
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IPC IPC(8): C22B11/00C25C1/20
CPCC22B11/04C25C1/20
Inventor 许良秋马晓红庄光军林文辉
Owner 龙岩环美新材料科技有限公司