Lead-zinc polymetallic sulfide ore recovery

With the development of non-ferrous metals is a demand for increased science and technology in recent years at home and abroad for associated polymetallic ores comprehensive recovery of metal minerals more and more attention, comprehensive recovery widen the road, and comprehensive recovery process effect The economic benefits are also becoming more and more significant.
1. increase the recovery rate of precious metals comprehensive recovery of precious metals, is an important way of lead zinc polymetallic sulphide ore beneficiation plant to increase economic efficiency.
According to statistics, 45% of the world's annual silver production is from mineral processing products produced from lead-zinc ore. China's current production of about two-thirds of silver from lead-zinc ore, gold and copper mineral relationship more closely, and recovered from the lead-zinc ore gold was relatively low. In recent years, due to the country's emphasis on precious metal recycling, many research institutes have begun to investigate the recovery of gold and silver in domestic lead-zinc multi-metal plants. Many factories have begun to pay attention to the research of precious metal recycling and have achieved Some gratifying progress.
Bajiazi processing plant is selected from copper, silver-lead-zinc complex sulphide ores, ore content of 150 to 220 g / t silver-containing mainly black mineral ore and a sulfur silver tin part of the natural silver. Originally using sodium cyanide process, the silver recovery rate is only about 30%. In May 1978, the copper-lead mixed-mix was replaced by the sulfite method, and the copper-lead separation was qualified by the sulfite-heating flotation process. Copper concentrate, and the silver recovery rate increased by 15. In March 1980, the ore section of a grinding (65 ~ 68% -200 mesh) was changed to two sections of continuous grinding (75 ~ 80% - 200 mesh). In August of the same year, copper and lead were mixed with butylamine black medicine to replace black and yellow medicines, and sulfurous acid was eliminated, which increased the recovery rate of silver in copper-lead concentrate by 7.23%. In the second quarter of 1982, an independent flotation tank was set up before the rough selection of copper and lead, and some of the butylamine black medicine was replaced by black medicine No. 31 to float the mixed concentrate containing silver and lead at the initial stage, so that it was not regrind and Multiple selection cycles. Due to the adoption of this process, the silver recovery rate reached 69.26% (including silver in zinc concentrate), which was 3.37% higher than the original process.
Qixiashan processing plant preferably selected using lead, zinc and sulfur separation process is selected from mixed lead flotation agent is nigrosine collector, zinc sulfate and sodium sulfite inhibition sphalerite, pyrite. The silver recovery rate is only 38.5%. In 1982, Jiangsu Metallurgical Research Institute and Beijing Metallurgical Design and Research Institute respectively replaced lime with sodium sulfite. The collector was made of butylamine black or butyl ammonium black and aniline black (6:1 ratio). In the test, good flotation results were obtained. The recovery rate of silver in lead concentrates is over 60%.
Lead-zinc polymetallic ore generally contains less gold, but some ore (Xiaotieshan, Shuikoushan, Zhanggongling, etc.) have higher gold content in the ore treated. Fine-grained gold is generally enriched in the corresponding copper-lead concentrate, and coarse-grained gold is generally recovered by re-election. The Shuikoushan Concentrator adopts the re-election method to treat the lead-floating ore, and the gold recovery rate is increased by 4.98%.
Although many factories have made some progress in the comprehensive recycling of precious metals, there are still some factories that do not pay enough attention to the recovery of precious metals. In order to improve the recovery rate of precious metals in lead-zinc polymetallic ore beneficiation in China, it is necessary to carefully study the occurrence state of gold and silver in each ore, the characteristics of dyeing and the behavior in the flotation, and select the most suitable process. Mineral fineness and chemical system to improve the comprehensive recovery of precious metals in Pb and Zn polymetallic ore in China to a new level.
2. Recycling of associated low-grade metals The comprehensive recovery of associated low-grade metals can expand mineral resources and improve the economic benefits of enterprises.
The scale of Zhejiang Zhuji Lead-Zinc Mine is 100 tons/day. The ore is mainly composed of zinc, with only a small amount of lead, copper and sulfur (see table below). In the case of a large difference between the main mineral metal grade and the associated mineral metal grade, a mixed flotation process of copper, lead and sulfur; a cumulative intermittent separation method and a cyanide-free flotation reagent system are used to realize the associated low-grade metal minerals. Comprehensive recycling. From a zinc concentrate product to four qualified concentrate products of lead, sulfur and copper. Seven elemental metals such as P, Zn, Cu, S, Au, Ag, and Cd were recovered. The process effect is better. Such a small selection plant, only Pb, S, Cu, Au, Ag and other metal comprehensive recycling annual profit of 21.21 million yuan, accounting for 35.35% of the company's total annual profit, its economic benefits are very significant.

The mine production process is as shown below. The zinc concentrate grade is 53-54% Zn, the recovery rate is 94-96%; the lead concentrate grade is 55-60% Pb, the recovery rate is 41-45%; the sulfur concentrate contains about 40% sulfur. [next]

The advantages of this process:
(1) Low-grade copper, lead and sulfur minerals are mixed and floated in a slurry with a slightly acidic pH value. No adjustment agent is needed. Because the three minerals are similar in floatability, they can float at the same time. The mineral density of the three minerals in the pulp can reach the formation of mineralized foam, creating conditions for process operation. Since zinc is a cyanide-free zinc sulphate and sodium hydrogen sulfite (only zinc sulphate is not used in the case of copper), it is beneficial for gold and silver to float together with galena and to be enriched in mixed concentrate. Due to the low yield of mixed concentrate of partially mixed flotation, it is XJK-0.23 flotation machine. If continuous production, it is difficult to form mineralized foam. In the actual production, the cumulative discontinuous sorting method is used to obtain satisfactory results. . [next]
(2) The process can effectively separate the associated metal minerals and sphalerite. The sphalerite can be floated separately, and some of the easy-floating gangue minerals (such as graphite ) are selected in the partial mixing operation to make the main product. The quality of zinc concentrate has been improved and the recovery rate has been guaranteed.
(3) The process takes into account the floatability of each mineral and has the advantages of preferentially floating lead, sulfur and copper. Low-grade lead and copper minerals are avoided. To improve the quality and recovery rate of concentrate.
3. Recycling other valuable minerals
Lead-zinc polymetallic ores are often associated with valuable industrial minerals such as fluorite and barite . Panjiachong Lead-Zinc Mine (hereinafter referred to as “Pan Mine”), after flotation of lead and zinc, produces acid grade fluorolithic acid by flotation, which is not only sold domestically but also exported to Japan and Europe and the United States.
The mine production process (recycling fluorite part) is shown below.

Years of production practice has proved that a single water glass inhibition scheme is very difficult for the calcium carbonate containing calcium carbonate to be close to 2% or more, especially for the ore containing higher mud. .
The experimental study found that the inhibition scheme of aluminum sulfate plus water glass and baking glue has the best effect on fluorite.

Silicone Phone Holder

About Silicone phone holder:
Silicone phone hold can be divided into silicone cell phone holder,silicone bike holder,silicone car holder and so on.Phone holder also call Phone stand,It is built with silicone, silicone material to make it more flexible, durable, longer lasting and good toughness.You can use it as phone mount at home,at the office,at kitchen for fashion and youth feel.Silicone phone holder can protect your phone from scratches and sliding.
Silicone Electronic Products introduction:
1.Product name:Silicone phone holder,foldable phone stand holder,silicone mobile phone holder,silicone Phone Case holder,cell phone stand,silicone car phone holder
2.Place of origin:Guangdong China
3.Color:any pantone color
4.Logo:Printing,debossed,embossed
5.MOQ:500pcs.
6.Package:1 pcs/opp,customized design is available.
7.Design:Customized/stock

8.Certification:FDA,LFGB,SGS,ROHS,etc.

9.Usage:Use for phone.
10.Silicone phone holder photoes for reference.

Silicone Phone Holder,Foldable Phone Stand Holder,Silicone Mobile Phone Holder,Silicone Phone Case Holder,Cell Phone Stand

Dongguan OK Silicone Gift Co., Ltd. , https://www.dgsiliconekitchenware.com