Because niobium minerals are easily soluble in alkaline cyanide solutions, niobium minerals can seriously affect the cyanide leaching of gold . There are several common methods for separating gold and antimony minerals:
1.8 to 10% sodium sulfide solution is a good solvent for stibnite and some cerium oxide minerals. Usually, at 80 to 90 ° C, when the slurry concentration is not less than 33%, the gold and strontium in the ore can be separated by leaching with the above solution for 1 to 2 hours. After the residue was washed with water, gold was recovered by cyanidation.
2. The gold-bismuth concentrate can be calcined by evaporating the antimony trioxide. Usually, the calcination is carried out in two stages, the first stage is calcined at 500 to 600 ° C for 1 hour, and the second stage is calcined at 1000 ° C for 2 to 3 hours. The antimony trioxide is recovered by a dust collector, and after the calcination is leached with dilute sulfuric acid, the gold is recovered by cyanidation.
3. The hot leaching in the medium of oxygen and ammonia solution can recover gold from the gold-bismuth concentrate. When the concentration of ammonia hydroxide in the solution is 33 to 35%, the temperature is 170 to 175 ° C, and the oxygen pressure is 15 to 16 atm, the leaching time is 24 to 30 hours, and 99% of gold can be recovered in the gold-rich concentrate.
4. Gold is leached from the gold-rhenium concentrate using an acidic thiourea [CS(NH 2 ) 2 ] solution with an oxidizing agent. When the concentration of thiourea in the solution is 0.1 to 1%, the concentration of sulfuric acid is 0.1 to 0.5%, and the concentration of oxidizing agent is 0.001 to 0.1%, the leaching rate of gold can reach 60 to 70%.
ThyssenKrupp Elevator Spare Parts, ThyssenKrupp Elevator Parts, ThyssenKrupp Lift Spare Parts, ThyssenKrupp Lift Parts
ThyssenKrupp Elevator AG
The Elevator Technology business area brings together the ThyssenKrupp Group's global activities in passenger transportation systems. With sales of 7.2 billion euros in fiscal 2013/2014 and customers in 150 countries, ThyssenKrupp Elevator is one of the world's leading elevator companies. With about 50,000 skilled employees, the company offers innovative and energy-efficient products designed to meet customers` individual requirements.
The portfolio includes passenger and freight elevators, escalators and moving walks, passenger boarding bridges, stair and platform lifts as well as tailored service solutions for all products. 900 locations around the world provide an extensive sales and service network to guarantee closeness to customers.
The business is organized in five operating units, four of which concentrate on the regional elevator business (Central/Eastern/ Northern Europe, Southern Europe/Africa/Middle East, Americas and Asia/Pacific). The other one, which operates globally, is: Access solutions (passenger boarding bridges/chair, service and platform lifts, as well as home elevators).
ThyssenKrupp Elevator Asia Pacific
ThyssenKrupp Elevator Asia Pacific is active in the Asia Pacific market with a dense network of branches and offices offering new installation, modernization and service business for the complete product range.
Our manufacturing factories are located in the following areas:
- Songjiang Elevator Plant in Shanghai, China
- Zhongshan Elevator Plant in Guangdong, China
- Cheonan Elevator Plant, Korea
- Zhongshan Escalator and Passenger Boarding Bridge Plant in Guangdong, China
- Access Plant in Shanghai, China
ThyssenKrupp Elevator (China)
ThyssenKrupp Elevator entered China market in 1995. As the fast development of business and production, we have about 10,000 staffs and four factories over the country. We provide elevators, escalators, moving walks, passenger boarding bridges, and accessibility lifts.
ThyssenKrupp Elevator (China) offer installation, modernization and service to all product series, depending on branches, office network, local factories and International Technical Services (ITS). Our goal is to be an efficient elevator solution provider to fit different uses and demands. Anywhere, anytime. More...
ThyssenKrupp AG in brief
ThyssenKrupp has 155,000 employees in around 80 countries work with passion and expertise to develop solutions for sustainable progress. Their skills and commitment are the basis of our success. In fiscal year 2013/2014 ThyssenKrupp generated sales of €43 billion.
Innovations and technical progress are key factors in managing global growth and using finite resources in a sustainable way. With our engineering expertise in the areas of "Material", "Mechanical" and "Plant", we enable our customers to gain an edge in the global market and manufacture innovative products in a cost and resource efficient way.
ThyssenKrupp Elevator Spare Parts
ThyssenKrupp Elevator Spare Parts, ThyssenKrupp Elevator Parts, ThyssenKrupp Lift Spare Parts, ThyssenKrupp Lift Parts
CEP Elevator Products ( China ) Co., Ltd. , https://www.elevatorcomponent.nl