| The use and distribution of phosphate rock resources and process and a brief overview of the pharmacy of phosphorite flotation are introduced in this thesis. A collector applied to flotation at room temperature with a low grade phosphate rock collector is developed successfully during a series of complex experiments and the mechanism of the collector acting on phosphorite is researched in a certain extent.The non-ionics surface-active AMS and ams ion surface-active MS-1,AES,TAS,SDS,SDBS are selected to compound with cottonseed oil soap with different proportions during the experiment.The best recovery ratio of AMS and cottonseed oil soap is 5%, and the effect of flotation is best when the collector is WTS-1 in the volume of 1.8Kg/t; The best recovery ratio of AES and cottonseed oil soap is 10%, and the effect of flotation is best when the collector is WES-3 in the volume of 1.8Kg/t; The best recovery ratio of TAS and cottonseed oil soap is 2.5%, and the effect of flotation is best when the collector is WAS-0 in the volume of 1.8Kg/t; The best recovery ratio of SDS and cottonseed oil soap is 5%, and the effect of flotation is best when the collector is WDS-1 in the volume of 2.0Kg/t; The best recovery ratio of SDBS and cottonseed oil soap is 5%, and the effect of flotation is best when the collector is WBS-1 in the volume of 1.8Kg/t;By compare the five pharmaceutical systems is to detemine the effece of flotation is best whe the agent is WTS-1 in the volume of 1.8Kg/t.The AMS+MS-1 are selected as surfactant which is compound with cottonseed oil soap from other accessory surfactants during the experiment. And the two surfactants and cottonseed oil soap are mixed together at low recovery ratio as collector which is used to explore the best technological process of flotation of low grade phosphate of Dayukou at room temperature. The flotation process is confirmed as one rough and cleaning separation and two reverse roughing separation and two reverse sweep election for the fine through the experimental study. At the -0.074mm 96.70% of the grinding fineness and the 24℃of the temperature, the total usage of chemical agents is Na2CO37.0kg/t,Na2SiO3 2.5kg/t,WTS-1 2.0 kg/t in roughing and H2SO4 18kg/t,H3PO43.0kg/t,WTS-1 0.5kg/t in anti-flotation roughing and H2SO4 9kg/t in the first sweptin ofanti-flotation and H2SO46kg/t in the second scavenging of anti-flotation, The grade of concentrates exceeds 30.69% and the recovery of concentrates preponderates 79.37%, The conclusion is that the collector can be carried out at room temperature in phosphate rock flotation and achieved better flotation indicators.The study of surface tension and blistering sexualcontact, the relative angle,ζ-potential testing and the IR testing testified that collector of the fatty acids adsorption on the phosphorite occurs when pH=10～11, and increase flotation performance of the phosphate rock and coexistence of the minerals such as the silicate minerals, sodium carbonate mineral salt.The purpose of this study is determine the appropriate medicines which can be carried out at room temperature in phosphate rock flotation and medicines system through research, development and the filter, and float in the system takes.On the other hand, this medicine will be arrested the tests for other low tastes a phosphate flotation, and verify it's flotation performance.
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