2.2.1 Characteristics of British English floor floor mining ore block is a project Wengfu phosphate ore opencast mining first section, is gently inclined thick ore body, the type of top-down into its natural form a dense phosphate rock, Agglomerate and gravel-like phosphorite. The dense phosphorus rock has high grade and low impurity content, and is a high-quality export mine without beneficiation . The sales price is high; the mass of the agglomerate and gravel-like phosphorite is low, and the impurity content is high, which needs to be used for phosphate production. If the three-layer mine is mixed, the processing cost is high and the best is not achieved, so there is a problem of mining and distribution. In the production activities of Yingping Mine in the past 10 years, according to the market demand, the dense ore is divided and transported, directly exported, and the agglomerated and gravel-like ore is mixed and used for sorting phosphorus concentrate. Therefore, whether the ore mining and distribution can be realized and the ore loss index is optimized is the key to the success of Yingping Mine.
2.2.2 Resource recovery in mining methods:
The height of the step is 10 meters, and the slope angle of the working step is 65-70O.
The loading and unloading work: the backwashing of the residual waste rock is carried out by using the backhoe, and then the ripper of the high-power bulldozer is used to layer and loosen the pile. Near the stratification, the backhoe is used for further mining to ensure the maximum utilization of high-quality mineral resources.
When the dense ore is collected, the bulldozer and gravel-like ore are piled up and mixed by bulldozer.
Ore Loss and Depletion Management - The main cause of depletion of moderately thick and medium-thick ore bodies: the blasting causes the mixing of the top dolomite and the floor siliceous rocks, and the residual of the ore body in the bottom plate.
Therefore, Yingping Mine uses the on-site quality manager to control the surface of the ore body with the on-site rig --avoiding ultra-deep, and the bottom plate can not penetrate into the siliceous rock in the bottom plate.
Finally, the residual ore body of the bottom plate is cleaned. According to the residual condition of the ore body, the hydraulic drilling rig is perforated, and the blasting is performed separately.
2.3 Expanding the scope of mineral processing and applying the existing technology to the siliceous calcium phosphate rock According to the overall planning of the Gaoping and Baiyan mining areas of the Lianyungang Design and Research Institute of the Ministry of Chemical Industry and the preliminary design of the Yongfu Phosphorus Mine, the first mining area is Gaoping Mining Area. Yingping Mine Section. Therefore, the Xinlongba Concentrator, which was built, mainly deals with the b-layer mine. I mine ore and minerals are two quite different composition, type of ore mining Gaoping mass of calcium magnesium phosphate rock (ore said layer b) based, the major mineral component P 5 O 2 average of 27%, MgO 6%, SiO 2 4-6%; and 50% of the Baiyan mining area is silicon-calcium phosphate rock (called a layer of ore), the main component of the ore is P 2 O 2 average 25%, MgO 4%, SiO 2 10-16%, due to The composition of the ore is different. Different mineral processing methods or comprehensive mineralization should be considered in the development and utilization.
According to the overall planning and requirements of the enterprise's mineral fertilizer development, combined with the current situation of the mine's current production, in order to achieve balanced mining of the mine and make full use of the limited mineral resources, the mine has carried out the ore dressing test research work after the mine is put into production. .
It is known from a small experiment that the a and b layers of the Baiyan mining area are mixed and selected, and the existing reverse flotation process and ore dressing agent are utilized, when a:b≤1:1. It can obtain the beneficiation index of P 5 O 2 >31%, MgO<1.0%, SiO 2 <13% and recovery more than 90%; the grade of phosphorus concentrate increases with the increase of b layer mineral, SiO 2 , R 2 The percentage of O 3 decreases as the amount of b-layer minerals increases. When a:b≤1:2.5, the percentage of P 5 O 2 , MgO, R 2 O 3 in the phosphate concentrate can meet the requirements of the wet process for acid production.
In order to further verify the experimental results, and at the same time provide experimental evaluation of phosphorus concentrate for wet acid production, further examination of the consumption index and production of the dense system, from October 28 to November 4, 2002, the concentrator conducted industrial tests. From industrial trial production, it is technically feasible to use the existing equipment and facilities of the concentrator, the production process, and the use of mixed beneficiation to treat the a-layer or a+b layer. Fully capable of wet acid production.
From the production practice of one year, the cost of treating mixed ore and grinding b-layer mine separately is basically the same. In the production process, the chemical consumption is: WF-01=0.243Kg/t ore, H 2 SO 4 =12.37 Kg/t ore, only slightly lower than the chemical consumption of b layer mine WF-01=0.233Kg/t ore, H 2 SO 4 =12.33 Kg/t ore, so it is feasible to use mixed ore dressing economically. of.
3 Economic benefits achieved
3.1 Mining The Yanfu Phosphorus Mine adopts the new flotation collector WF-01 instead of PA-31, and has achieved a good beneficiation index, which ensures the delivery of high grade ore in Yingping Mine and the digestion of floor ore. If calculated according to the selected grade (30±1)% of the original design value, after the high-quality mine is exported, the medium and low grade ore will be retained in the stope. Before 1999, the estimated stay in the stope was over 400,000 tons.
By the end of December 2004, Yingping Mine had produced a total of 12.68 million tons of ore, of which 70,000 tons were recovered from the bottom plate, of which 3.63 million tons were for foreign trade. The average mined grade is 31.46%, the foreign trade grade is P 2 O 5 ≥ 34.5%, the Yingping mine mining range is 1.909.21 million tons, and the average geological grade is 31.98%.
The actual depletion rate and loss rate index of mining is far superior to the design index. After calculation, the actual mining depletion rate is 1.63%, the mining loss rate is 3.08% (design depletion rate Ï=4.77%, design loss rate Sk=3.75). %).
In addition, due to the export of rich ore, the selected ore grade P 2 O 5 is reduced by 3 percentage points compared to the design. The average grade of ore currently selected is about 26% per month, and the concentrate after sorting can meet the demand for wet-process phosphoric acid production.
According to statistics, Yingping Mine has produced a total of 3.633 million tons of high grade ore (P 2 O 5 ≥ 34.5%), accounting for 28.63% of the mined ore. Obtain significant economic benefits. Only the recovery amount of the bottom plate can realize the output value of 24.65 million yuan (the price of ore according to P 2 O 5 = 25% is 35 yuan / t).
3.2 Mineral processing
2.2.2 Resource recovery in mining methods:
The height of the step is 10 meters, and the slope angle of the working step is 65-70O.
The loading and unloading work: the backwashing of the residual waste rock is carried out by using the backhoe, and then the ripper of the high-power bulldozer is used to layer and loosen the pile. Near the stratification, the backhoe is used for further mining to ensure the maximum utilization of high-quality mineral resources.
When the dense ore is collected, the bulldozer and gravel-like ore are piled up and mixed by bulldozer.
Ore Loss and Depletion Management - The main cause of depletion of moderately thick and medium-thick ore bodies: the blasting causes the mixing of the top dolomite and the floor siliceous rocks, and the residual of the ore body in the bottom plate.
Therefore, Yingping Mine uses the on-site quality manager to control the surface of the ore body with the on-site rig --avoiding ultra-deep, and the bottom plate can not penetrate into the siliceous rock in the bottom plate.
Finally, the residual ore body of the bottom plate is cleaned. According to the residual condition of the ore body, the hydraulic drilling rig is perforated, and the blasting is performed separately.
2.3 Expanding the scope of mineral processing and applying the existing technology to the siliceous calcium phosphate rock According to the overall planning of the Gaoping and Baiyan mining areas of the Lianyungang Design and Research Institute of the Ministry of Chemical Industry and the preliminary design of the Yongfu Phosphorus Mine, the first mining area is Gaoping Mining Area. Yingping Mine Section. Therefore, the Xinlongba Concentrator, which was built, mainly deals with the b-layer mine. I mine ore and minerals are two quite different composition, type of ore mining Gaoping mass of calcium magnesium phosphate rock (ore said layer b) based, the major mineral component P 5 O 2 average of 27%, MgO 6%, SiO 2 4-6%; and 50% of the Baiyan mining area is silicon-calcium phosphate rock (called a layer of ore), the main component of the ore is P 2 O 2 average 25%, MgO 4%, SiO 2 10-16%, due to The composition of the ore is different. Different mineral processing methods or comprehensive mineralization should be considered in the development and utilization.
According to the overall planning and requirements of the enterprise's mineral fertilizer development, combined with the current situation of the mine's current production, in order to achieve balanced mining of the mine and make full use of the limited mineral resources, the mine has carried out the ore dressing test research work after the mine is put into production. .
It is known from a small experiment that the a and b layers of the Baiyan mining area are mixed and selected, and the existing reverse flotation process and ore dressing agent are utilized, when a:b≤1:1. It can obtain the beneficiation index of P 5 O 2 >31%, MgO<1.0%, SiO 2 <13% and recovery more than 90%; the grade of phosphorus concentrate increases with the increase of b layer mineral, SiO 2 , R 2 The percentage of O 3 decreases as the amount of b-layer minerals increases. When a:b≤1:2.5, the percentage of P 5 O 2 , MgO, R 2 O 3 in the phosphate concentrate can meet the requirements of the wet process for acid production.
In order to further verify the experimental results, and at the same time provide experimental evaluation of phosphorus concentrate for wet acid production, further examination of the consumption index and production of the dense system, from October 28 to November 4, 2002, the concentrator conducted industrial tests. From industrial trial production, it is technically feasible to use the existing equipment and facilities of the concentrator, the production process, and the use of mixed beneficiation to treat the a-layer or a+b layer. Fully capable of wet acid production.
From the production practice of one year, the cost of treating mixed ore and grinding b-layer mine separately is basically the same. In the production process, the chemical consumption is: WF-01=0.243Kg/t ore, H 2 SO 4 =12.37 Kg/t ore, only slightly lower than the chemical consumption of b layer mine WF-01=0.233Kg/t ore, H 2 SO 4 =12.33 Kg/t ore, so it is feasible to use mixed ore dressing economically. of.
3 Economic benefits achieved
3.1 Mining The Yanfu Phosphorus Mine adopts the new flotation collector WF-01 instead of PA-31, and has achieved a good beneficiation index, which ensures the delivery of high grade ore in Yingping Mine and the digestion of floor ore. If calculated according to the selected grade (30±1)% of the original design value, after the high-quality mine is exported, the medium and low grade ore will be retained in the stope. Before 1999, the estimated stay in the stope was over 400,000 tons.
By the end of December 2004, Yingping Mine had produced a total of 12.68 million tons of ore, of which 70,000 tons were recovered from the bottom plate, of which 3.63 million tons were for foreign trade. The average mined grade is 31.46%, the foreign trade grade is P 2 O 5 ≥ 34.5%, the Yingping mine mining range is 1.909.21 million tons, and the average geological grade is 31.98%.
The actual depletion rate and loss rate index of mining is far superior to the design index. After calculation, the actual mining depletion rate is 1.63%, the mining loss rate is 3.08% (design depletion rate Ï=4.77%, design loss rate Sk=3.75). %).
In addition, due to the export of rich ore, the selected ore grade P 2 O 5 is reduced by 3 percentage points compared to the design. The average grade of ore currently selected is about 26% per month, and the concentrate after sorting can meet the demand for wet-process phosphoric acid production.
According to statistics, Yingping Mine has produced a total of 3.633 million tons of high grade ore (P 2 O 5 ≥ 34.5%), accounting for 28.63% of the mined ore. Obtain significant economic benefits. Only the recovery amount of the bottom plate can realize the output value of 24.65 million yuan (the price of ore according to P 2 O 5 = 25% is 35 yuan / t).
3.2 Mineral processing
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