Now, how lithium batteries can enter the light electric vehicle market can be considered in the following aspects. First, give full play to the characteristics of lithium batteries and design lighter electric vehicles with higher performance. For example, a battery of the same quality can be installed to increase the capacity of the vehicle (rechargeable mileage, gradeability, and load capacity). Second, we designed light electric vehicles with 1, 2, 3, and 4 people respectively. Third, study to improve the quality of cars and reduce prices. Fourth, strengthen sales measures to make it enter the countryside and go abroad. Fifth, let lithium-ion battery electric vehicles enter the market early and withstand the market's exercise. From 1998 to 2005, the number of electric bicycles in China was used in the field of batteries, which also supported and promoted the development of electronic devices. Nowadays, light electric vehicles have been widely accepted, and lead-acid batteries play a large role. In the past seven years, the production and sales volume has increased by nearly doubling every year. Lead-acid batteries have occupied the position of light-duty electric vehicles at this stage with their mature technologies and low prices. During this period, the research work of lithium-ion batteries must be continuously strengthened. In addition to improving the performance of lithium manganate and reducing its price, new battery materials must be studied to find new materials with larger capacity, longer life, and lower cost. The coprecipitation method is the best preparation method. The catalyst prepared by the combination of sodium hydroxide and urea has high activity and thermal stability. The use of NHO to filter out the copper component of the catalyst has shown that there is an optimum copper content in the catalyst and that Cu plays an important role in forming the active site of the catalyst.
The equipment is new complete equipment used in gold trade to recover gold from the gold-carrying carbon. It is suitable for desorption and electrolysis of gold-carrying carbon with different grades. The desorption is an intermixture of 1~2% sodium cyanide and 1~4% sodium hydroxide. The desorption solution is pumped to the heater by circulating pump and heated to the desired temperature. Then the solution flows downward to the bottom of desorption column, through the gold-carrying carbon in the column and upward to the top of it. During flowing, the solution strip gold from the carbon (at this stage the solution containing gold is called as pregnant solution). The pregnant solution runs out from the top of the column and into the electrolytic cell. In cell, the gold in the solution is electrically deposited in the steel wool of the cathode frame, and the rest (called as lean solution) flows back to desorption solution cell and recycled.
The gold mud containing rich gold and silver is taken out of desorption cell and transported to the separation section.
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