Pretreatment method for refractory gold ore with antimony and arsenic

Abstract

The invention relates to the technical field of metallurgy, in particular to a pretreatment method for refractory gold ore with antimony and arsenic. The method comprises the steps that 1, the refractory gold ore with antimony and arsenic is broke and subjected to ball milling to form powder; 2, the powder obtained in the step 1 is added into a hermetic vertical pipe type heating furnace, neutral protective gas is introduced in, roasted ore is obtained after roasting and cooling are carried out, produced tail gas enters a tail gas collection device, collected smoke dust is leached through a mixed solution of Na2S with the concentration of 50-200 g/L and NaOH with the concentration of 20-100 g/L, solid-liquid separation is carried out, a filter residue with arsenic and a leaching solution with antimony are obtained, and the leaching solution is electrodeposited to produce metal antimony, wherein leaching time is 30-180 min, and leaching temperature is 20-95 DEG C. The pretreatment method has the advantages that the technological process is simple, operation is flexible, roasting time is short, energy consumption is low, antimony and arsenic can be synchronously removed, smoke gas is low in toxicity and small in amount, and economic and social benefits are good.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a pretreatment method for refractory gold ores containing antimony and arsenic. Background technique [0002] As an important part of my country's gold resources, antimony and arsenic-containing gold ores are distributed in Hunan, Jiangxi, Gansu, Qinghai, Xinjiang, Guangxi, Sichuan, Tibet and other places, especially in the west of my country. ore deposit. [0003] The remarkable feature of antimony and arsenic gold ores is that antimony mainly exists in the form of stibnite, and is often associated with arsenopyrite and pyrite. Gold is in the microscopic and submicroscopic natural gold free state in antimony ores, or embedded In stibnite, arsenopyrite and pyrite. Due to the encapsulation of minerals and the formation of secondary antimony salt films on the surface of gold grains to hinder the leaching of gold during the process of cyanide leaching of stibnite, it is difficul...

AI Technical Summary

Problems solved by technology

The disadvantages are: ① release a large amount of SO 2 、As 2 0 3 and other toxic and harmful gases; ②The furnace gas dust collection and purification device is complicated, the operating cost is high, and the environment is seriously polluted; ③The process operation requirements are strict, and it is easy to cause "under-burning" or "over-burning", which affects the recovery rate of gold; ④ Antimony removal low rate

Disadvantages are: ① High requirements on equipment, high temperature and high pressure, and potential safety hazards; ② High maintenance costs; ③ Strict process control conditions, the elemental sulfur solution produced by the reaction wraps gold again, affecting gold recovery; ④ It is not suitable for containing robbing gold charcoal ore; ⑤The amount of waste water is large, the waste water treatment is difficult, and the production cost is high

The disadvantages are: ①The pretreatment time is long; ②The adaptability to raw materials is not strong, and it is not suitable for processing ores with high arsenic content and gold and carbon; ③A large amount of tail liquid containing arsenic needs to be treated harmlessly, and the environmental protection cost is high ; ④ large investment

The disadvantages are: ①The amount of waste water is large and the treatment is difficult; ②The adaptability to raw materials is not strong, and it is not suitable for processing materials containing gold, carbon, arsenic and sulfur; ③Reagent consumption is large; ④Arsenic, sulfur and other bases Difficulty recycling metals

Disadvantages: ①High power consumption; ②Due to the limited electrode area, the unit processing capacity of equipment is low; ③There is no large-scale industrial application yet

[0013] To sum up, if antimony-containing and arsenic-containing refractory gold ores adopt the existing roasting oxidation technology, antimony tends to form non-volatile antimony salts, which cannot be completely removed, antimony cannot be economically utilized, and a large amount of As is produced in the flue gas 2 o 3 , SO 2 , Sb 2 o 3 Toxic and harmful gases, such as toxic and harmful gases, are likely to cause environmental pollution; other wet treatment methods have problems such as high equipment requirements, high production costs, low production capacity, and difficult wastewater treatment.

Images