China's phosphorus resources are depleting, and it is increasingly restricting the production and development of phosphate fertilizer and phosphorus chemical industry in China. It is imperative to develop and utilize low-grade phosphorus resources in the north. Most iron ore north magnetic metal phosphate (titaniferous magnetite) - apatite (block) rock type ores, characterized by high grade magnetite, ilmenite symbiotic low grade and low grade phosphate rock, a small amount of sulfur-containing cobalt mine. Phosphorus and ilmenite are easy to be selected, but the cost of beneficiation is high. Most of the concentrators only magnetically select and recover magnetite, but the magnetic separation tailings are discarded, and the waste of resources is serious.
Since the 1980s, our institute has carried out mineral processing experiments on low-grade phosphate rock in the north and achieved good results. The ore type of Zhaobingou iron-phosphorus ore in Fengning County, Hebei Province is relatively simple, mainly composed of titanium magnet apatite ore. The ore structure is fine-grain-medium grain crystal structure and fine-grain-medium grain granitic crystal structure. it is good. The main minerals are magnetite, ilmenite, apatite, which contains a small amount of sulphur-cobalt ore. Phosphorus grade is low. In 2003, our institute conducted a comprehensive ore dressing test on phosphorus, ilmenite and sulphur-cobalt resources in Zhaobingou iron phosphate rock, and developed AW-10 new high-efficiency phosphate rock collector suitable for the ore's ore properties; The flotation process recovers phosphorus minerals, the heavy-magnetic separation process recovers ilmenite minerals, and the flotation process recovers the sulphur-cobalt minerals. The mineral processing index of the phosphorus mineral laboratory closed-circuit process test is: grinding fineness - 200 mesh content 47%, flotation temperature 20 ° C, original ore grade P2O5 3.34 %, concentrate yield 9.75%, grade P2O5 33.18 %, recovery rate 96.77 %. The sinter iron ore mineral re-election test is marked as: ore grade TiO2 4.50%～6.64%, TFe10.13%～12.51%, concentrate yield 4.59%～8.39%, grade TiO2 42.53%～42.98%, TFe39.46%～ 39.87 %, TiO2 recovery rate 43.38% ~ 54.33%. The re-selected titanium concentrate was magnetically selected by medium-strong magnetic field, and the final ilmenite concentrate grade was TiO245.50%. The sulphur-cobalt laboratory process test ore selection index is: original ore grade Co 0.0114%, S effective 1.07%, concentrate yield 1.52%, concentrate grade Co 0.4117%, S effective 44.76%, Co recovery rate 53.49%, S effective recovery The rate is 63.31%. From 2005 to 2008, our institute successfully used this product for industrial production of 200,000 t/a and 300 t/a concentrator, and achieved good mineral processing technical indicators, achieving low grade phosphorus, ilmenite, sulphur and cobalt. Industrialization of comprehensive recycling of minerals. The production process of 200,000 t/a flotation workshop is as follows: grinding fineness - 200 mesh 47%, flotation temperature is 25 ° C, raw ore grade P2O5 3.84%, phosphorus concentrate yield 9.68%, grade P2O537.88% The recovery rate is 95.49%. The production process of the 300t/a concentrator flotation workshop is as follows: grinding fineness - 200 mesh 31.90%, flotation temperature 14 ° C, original ore grade P2O5 3.02%, phosphorus concentrate yield 5.71%, grade P2O538.19% The recovery rate is 72.21%. Titanium industrial production commissioning process inspection indicators are: selected ore grade TiO27.02%, grinding fineness -200 mesh, content 39.65%, high grade concentrate yield 2.94%, grade TiO243.41%, recovery rate 18.18%; low grade The concentrate yield was 9.97%, the grade TiO223.61%, and the recovery rate was 33.53%. The sulfur and cobalt industrial production process test indicators are: original ore grade Co 0.0073%, S effective 0.20%, concentrate grade Co 0.3691%, S effective 39.31%, tailings grade Co 0.0051%, S effective 0.053%; concentrate yield by Co Calculated 0.60%, calculated according to S effective 0.37%; Co recovery rate of 30.34%, S effective recovery rate of 72.72%. Comprehensive recovery of phosphorus, ilmenite, sulphur-cobalt minerals, can also reduce the magnetite input grade from TFe12% to TFe9% to 10%, and expand resource reserves; the concentrator reduces the tailings emissions by more than 10% per year, equivalent to solids The tailings are more than 800,000 t/a, which reduces the tailings pollution in the mining area and reduces the safety hazards of the tailings dam. The zn128 collector used in the flotation of the Zhaobingou phosphate rock is non-toxic and non-polluting, and has good biodegradability and is beneficial to environmental protection. The result solves the problem that the flotation pulp needs to add a large amount of sodium carbonate to adjust the pH value of the slurry; the flotation temperature is lowered, and the normal temperature flotation is achieved, leading the international level. The research on the comprehensive beneficiation processing and utilization of low-grade phosphorus, ilmenite and sulphur-cobalt in Zhaobingou iron-phosphorus mine not only makes the enterprise have economic benefits, but also reduces environmental pollution, solves the employment problem, and has good environmental and social benefits. Played an exemplary role in the industry. This research has far-reaching significance for the comprehensive utilization and sustainable development of iron and phosphate mines in northern China.
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