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：The phosphate is low silicon carbonate collophane, gangue mainly dolomite. Apply to the reverse flotation technology, determine one-stage roughing and one-stage scavenging reverse flotation test process,Collector with paraffin soap oxidated,Inhibitor use sulfuric acid. By the reverse flotation process contain. When the ore grade is 20.11%,under the flow sheet can research qualified phosphate product with content of 33.95% in concentration and recovery of 62.06%.

The collophane is in oolitic structure, and associates with the gangue intricately; and hence a good concentrate in performance is hardly produced only by rinsing, in order to achieve a full liberation, fine-grinding is needed for the cellophane. Based on the results of both direct and reverse flotation tests, it shows that reverse flotation is effective in the benefication of the apatite to a certain extent. When reverse flotation is used to dress the run-of-mine which contains 26.95%P2O5, a concentrate containing 32.69% P2O5 can be obtained at a recovery of 84.99%.

Apatite is a valuable component of the collophane taken from Yunnan, as it is in the shape of oolith and contains a lot of carbon, and hence an effective benefication of the apatite is difficult to be occurred by means of concentration. Based on the results of both direct and reverse flotation tests, it shows that reverse flotation is effective in the benefication of the apatite to a certain extent. When reverse flotation is employed to treat the run-of-mine at a grade of 18.77%, the concentrate containing P2O5 24.04% at a recovery of 62.58% can be produced.

As one of major environmental endocrine disruptors (EEDs), bisphenol A (BPA) has been drawn increasingly lots of people in the world, which is also widely identified as an indispensable raw chemical in plastics production, food cans and dental composites. With increasing demand and production capacity of BPA, moreBPAwill enter into and contaminate the environment. So it has become a challenge that excess BPA jeopardizes the health of human being. Considering a pretty low dose of BPA existing in the environment, some advanced analysis techniques have been carried out to analysis BPA, such as HLPC, GC-MS, LC-MS. Compared with other physical and chemical treatment technology, biological treatment technology has the advantage of low cost and high efficiency.

Electric Vehicles (EVs) have been the important tendency of future vehicle development. This paper discusses the performance and features of EVs with AC drive system, and analyzes two dominating control schemes of AC motor dynamic model, i.e., Vector Control (VC) and Direct Torque Control (DTC). Principles, advantages, disadvantages, research hot spots and developing directions of the two control schemes were carefully presented. Moreover, the paper points out that the two difficulties of AC drive system are improving low-speed performance and dynamic performance.

Analysis of the surrounding rock stress distribution of neighborhood tunnel by using numerical simulation. Based on Cullen-Moore Theory, build a mathematical model of 1st principal stress σ1, 2nd principal stress σ2, internal friction angle φ, and cohesion c, then, make a expression of tunnel spacing safety factor A. Analysis a real tunnel project and evaluate its surrounding rock stability with safety factor A as the index. Propose an analysis method of judging the rationality of tunnel spacing.

Bus route accounting system with basic accounting methods and financial accounting principles of double-entry bookkeeping, the use of passenger daily, real-time billing, supplies, human resources systems to provide real-time data to a single line of commercial vehicles and accounting unit of revenue, costs , costs of collection, and ultimately accurate reflection of Busroutes, the fleet of the company's production operations financial condition.

The phosphate is low silicon carbonate collophane, gangue mainly dolomite. determine one-stage roughing and one-stage scavenging reverse flotation test process,the grinding fineness of 92.86% -200 mesh.Collector with paraffin soap oxidated,Three acid of sulfuric acid, hydrochloric acid, nitric acid as an inhibitor for contrast test,With concentration of 10% sulfuric acid 10000 g/t can research qualified phosphate product with content of 33.95% in concentration and recovery of 62.06%.