The Microcrystalline Processing Of Ore And Its Application In Reducing Agricultural Pollution

This thesis based on the basic principle of mechanical force chemistry, destroyed thecrystal lattice structure of natural mineral(include middle-low phosphate rock, potassium ore,Bentonite, zeolite, medical stone, etc.)by physical processing, which improve the physicalactivity of mineral slag. The selection of the excellent performance grinding agent, which candelay the arrival of the grinding equilibrium, make phosphate rock processing finenessfiner,and increase the specific surface area.Because of the destruction of the lattice structure, phosphorus of citrate acid soluble rateincreased from4.03%to44.3%, which makes the direct use of middle-low phosphate rockpossible.Replace the traditional fertilizer with microcrystalline processing phosphate rockpowder, obtain rainfall from farmland runoff and measure nitrogen, phosphorus andpotassium content, in surface runoff liquid, then compared with traditional fertilizationwater samples.Compared with the traditional fertilizer treatment,the two times phosphorusmineral powder treatment group, can reduce the phosphorus loss at the account of about60%,and after three months the phosphorus element can still release sustainable. At the same timetraditional phosphate phosphorus have been released off. The application of microcrystallinephosphate rock powder can also help sustained nitrogen release effect. Experimental resultsshow that the application of crystallites instead of chemical fertilizers, can reduce nitrogenloss by about20%.in the fist three months.In the agriculture evaluation,the two times theamount of phosphorus of phosphate rock processing tomatoes’ plant strains are on averageincrease the height of about6%, the yield increased by10%or so. But the effect ofphosphorus treatment is not as good as the traditional fertilization. In the experiment, treatment which added potassium microcrystalline powder, soluble solids content increasedsignificantly.Because phosphate rock has the adsorption function to potassium ion, when thepotassium content in the soil is reduced, then the potassium can dissolved into the soil.Therefore, the peach which adding phosphate rock, its soluble solids content is higher thanthat of traditional treament. The adding microcrystalline mineral potassium peaches averageweight increased by about7%compared traditional treatments.The soil column leaching experiment showed that, the combination of medical stone andbentonite had inhibitory effects on nitrogen,phosphorus and potassium loss.But theirinhibition is relatively small.The the zeolite inhibition of nitrogen and potassium loss duringthe experiment was obvious, but the inhibition decreased gradually with the experiment.Zeolite had no inhibitory effect on phosphorus loss, but the use phosphorus slag and zeolitetogether, can significantly extend the phosphorus release. The combination of zeolite andmedical stone have obvious effect on the reduction of nitrogen and phosphorus, andovercomes the shortcoming of short time effect of zeolite.. The combination of zeolite andmedical stone had nothing to do with potassium loss, the later effect was gradually obvious.The zeolite and bentonite combination’s effect on phosphorus and potassium loss was notobvious..The adsorption of zeolite on copper is good, but it has little adsorption to zinc ion.the adsorption of medical stone and bentonite on copper and zinc were better,but when theheavy metals in the environment reduced,it’s prone to desorption.