The composition of arsenic-bearing refractory gold mine is complex，in which gold is usually encapsulated by arsenopyrite and arsenian pyrite.Arsenic is a poisonous element，which is harmful to human health and has adverse effects on the ecological environment.At the same time，the arsenic-bearing ores can lead to excessive consumption of cyanide and affect cyanide leaching of gold.Therefore，the arsenic-bearing refractory gold ores need to be pre-oxidized before cyanide leaching.The transforming pathway and final form of arsenic have an important effects on the pre-oxidation treatment of arsenic-containing refractory gold ore.At present，there are three pre-oxidation methods for refractory gold ores，namely roasting process，pressure oxidation and bio-oxidation method.Roasting is a proven technology，which can comprehensively recover copper and arsenic，but it is difficult to avoid the release of arsenic in this process.The pressure oxidation is an environment-friendly process that can achieve high gold recovery，but the expensive pressure reactor used in this process will lead to a high capital cost.Bio-oxidation method can obtain a recovery rate close to that of the pressure oxidation method，and the equipment investment cost is much lower than that of the pressure oxidation method.However，the bio-oxidation reaction is slow and a longer residence time is needed.The long residence time and the low efficiency of bio-oxidation treatment，especially the slow oxidation and decomposition rate of low-arsenic minerals，restricts its further development.It may face competition from pressure oxidation in the future.However，if it can be combined with roasting process，it is possible to improve the roasting process with its own environmental advantages in arsenic treatment to form a gold ore treatment technology with both advantages of clean production and efficient treatment.The advantages and existing problems of these pre-oxidation methods for refractory gold ores were reviewed in this paper with emphasis on the conversion of arsenic.Considered the development status of Chinese gold industry and the requirements of environmental protection，the basic development direction of pre-oxidation for refractory gold ores in the future was prospected.With the wide application of arsenic-containing refractory gold ores，the decomposition of arsenic-containing ores by pre-oxidation has become a common process for gold extraction.The pre-oxidation process should consider not only the gold extraction efficiency，but also the safe disposal of arsenic-containing waste.With the increasing of environmental concerns，the requirements of cleaner production even exceed the requirements of production efficiency.The common development of clean production and efficient production is the main trend of current development.

In order to realize the comprehensive recovery of valuable metals in the cyanide circulating liquid，the comparative test and analysis of acidification and SART processes（Vulcanization-Acidification-Recycling-Concentration Process） was conducted，and the application of SART process was finally determined.Then the circulating liquid generated in the cyanide gold extraction process of the domestic gold industry was purified for the first time，and the step-by-step recovery and separation and precipitation of zinc and copper in the liquid phase of the cyanidation cycle were realized.47.45% zinc mud and 54.38% copper sludge were produced respectively，and recovered with high-grade precipitate products.And the weakly complexed cyanide is converted into free sodium cyanide and then returned to the production system for recycling，thereby reducing the cost of the cyanidation process.The application of SART process not only realizes the recovery of valuable metals，reduces the cost，but also solves the employment problem，reduces the pressure of subsequent smelting and environmental protection，and achieves good economic，environmental and social benefits.

In recent years，with the continuous depletion of shallow mineral resources，there are many theoretical and practical studies on the recovery and utilization of sulfide ores in cyanide tailings.However，the existence of floatable gangue will hinder the recovery of sulfide ore in cyanide tailings.Therefore，it is very important to find out the adsorption mechanism of CN^- on the surface of gangue minerals and the change of surface wettability to identify the cause of low flotation recovery of cyanide tailings.In this paper，three typical gangue minerals，quartz，feldspar and calcite，were used as adsorbent，and NaCN was used as adsorbent.The influence of adsorption time and amount of adsorbent on the adsorption effect of CN^- were investigated.At the same time，the wettability difference before and after the adsorption of CN^- on the surface of gangue minerals was analyzed by using the contact angle detection method of solid droplet，and the adsorption kinetic model was fitted for the adsorption results.The results show that quartz，feldspar and calcite exhibit different degrees of adsorption and selectivity for CN^-.When the mineral dosage was 5 g and the contact time was 12 h，the adsorption rate of CN^- tend to be stable.At this time，the adsorption rates of quartz，feldspar and calcite for CN^- are 43.9%，58.0% and 43.6%，respectively.Through kinetic study，it is found that the adsorption of CN^- by quartz and feldspar is mainly physical adsorption.There is binding adsorption between CN^- and calcite.Finally，according to the contact angle detection，the adsorption of CN^- resulted in the enhancement of the surface hydrophilicity of gangue minerals，and the surface contact angles of quartz，feldspar and calcite decreased from 38.5°，15.6° and 35.4° to 18.6°，14.4° and 20.6°.After the action of SBX flotation reagent，the surface contact angle of gangue minerals increase，but still showes hydrophilic properties.It shows that cyanidation will not cause the following flotation of non-target minerals when recovering sulfide ores from cyanide tailings flotation，which provides theoretical guidance for achieving efficient separation and flotation of metal sulfide ores in cyanide tailings.

The leaching agent cyanide has been on the verge of elimination due to its great harm to the environment and human health.The non-cyanide agent thiocyanate as an efficient and environmentally friendly gold leaching agent has become the object of research by scholars both domestic and foreign.However，the recovery methods from thiocyanate leachate are less studied，and there are problems with low efficiency and high cost of gold recovery.Therefore，it is urgent to find a highly productive，low-cost，and simple method to recover gold from leaching solution efficiently.On the basis of the above problems，ammonium thiocyanate was used for the leaching test of bio-oxidized slag from a difficult gold concentrate，and recovered gold from the leaching solution by electrodeposition.The single factor method was used to study the influence of various factors on the gold deposition rate.The results show that the self-made electrode with a large surface area，good corrosion resistance，and high metal deposition efficiency is an excellent cathode.The graphite rods with good conductivity，not involved in the reaction process，reused，is a good choice for anode materials.Stainless steel rods are not suitable as electrode materials due to their susceptibility to corrosion.Under the conditions of electrode spacing of 10 mm，cell voltage of 4 V，solution pH value of 12，and solution temperature of 35 ℃，using a graphite rod as an anode and a self-made electrode as a cathode，the gold deposition rate can reach 98.95%.The interaction between tank voltage，solution pH value，and solution temperature and the effect on gold deposition rate were investigated by response surface methodology，and the electrodeposition gold response surface regression model was established.The P value and mismatch value of the model are within a reasonable range，and the predicted value and actual value of the gold deposition rate basically fell in a straight line，shows that the model fits well and is highly reliable.The correlation between the test factors and the gold deposition rate can be described.The final results show that the degree of each factor on the gold deposition rate is cell voltage>solution pH value>solution temperature，among them，the interaction between cell voltage and solution pH value is the most significant，and the interaction between solution pH value and solution temperature is the least significant.Under the optimal conditions of cell voltage 4.10 volts，solution pH value of 12.40，and solution temperature of 39.58 ℃，the predicted value of the model is 99.06%，and the experimental average value is 99.04%.The two results are remarkably close，which proves that the model can accurately analyze and predict the gold deposition rate.This study further improves the theoretical system of thiocyanate gold extraction process.