[Reading] A mining method in which a leachate is used to selectively leach a useful component from a heterogeneous ore under natural burial conditions and extract a reaction-producing compound is referred to as in-situ leaching mining, referred to as in-situ leaching. The advantages are: because there are no expensive and heavy wells or stripping projects, and there are no processes such as rock blasting, ore transportation and crushing, so the capital investment is small, the construction period is short, and the production cost is low... First, the basic concept A mining method in which a leachate is used to selectively leach a useful component from a heterogeneous ore under natural burial conditions and extract a reaction-producing compound is referred to as in-situ leaching mining, referred to as in-situ leaching. The term "in situ" and "naturally buried" as used herein means that the ore has not undergone any displacement. A layer of a useful component in the ore is referred to as a leachate by injecting a layer of minerals through an infusion process. The leaching solution is contacted with a useful component in the ore to carry out a chemical reaction. The soluble compounds formed by the reaction enter the solution stream permeating along the ore layer under diffusion and liquid action. The solution containing the ingredients is moved in a certain direction under the hydraulic drive caused by the artificial action, and is pumped to the surface through the liquid collection process. The solution containing the ingredients that is drawn to the surface is called an extract or leachate. The useful component in the extract liquid reaches a certain level and is a product of the in-situ leaching process, which is called a product solution (precious liquid or rich liquid). The liquid-filling process of immersing the immersion solution in the ore layer and the collecting process of pumping the solution containing the component from the mineral layer to the surface can be a drilling, a well or a surface trench, or a liquid-filled drilling and collecting well Coordinated joint engineering, as shown in Figures 1a, b, c, d. Figure 1 Collection engineering section A-injection hole and liquid suction hole profile; b-injection hole, liquid injection groove and liquid collection groove profile; C-injection hole and collecting roadway section; d-injection and liquid collection engineering section 1-aqueous layer; 2-injection hole; 3-suction hole; 4-hydraulic line; 5-aquifer; 6-mine body; 7-filter tube; 8-injection hole and liquid injection ditch; 9-collector ditch; 10--collecting roadway and pumping wellbore; 11, 12 - Horizontal injection holes and collection holes for interchangeable use; 13 - ore body boundary Second, the scope of application and advantages and disadvantages Situ leaching, has been used in uranium mining ore and copper, and is vigorously studied, tried to be applied to the mining of gold, manganese, nickel, selenium, molybdenum, rare earth, oolitic limonite ore and other minerals apatite. In-situ leaching technology is not suitable for any deposit. It is only suitable for ore deposits with loose or broken or fractured pores and pores. The geological and hydrogeological conditions of the deposit related to the in-situ leaching process and its results are mainly as follows: 1. The ratio of the permeability coefficient, effective porosity and fracture rate of the ore and surrounding rock in the ore layer, the permeability coefficient of the ore and the permeability coefficient of the surrounding rock. 2, the top and bottom seam permeability coefficient slate layers and their ratio. 3. The water depth and head value of the groundwater in the ore layer, the chemical composition, salinity and water temperature of the groundwater in the ore layer. 4. The thickness of the ore and ore body, the ratio of the thickness of the ore body to the thickness of the ore layer. 5. Ore grade. 6. The depth, size, occurrence and shape of the ore body, and the reserves of the deposit. 7. The ore and surrounding rock in the ore layer, as well as the material composition, chemical composition and grain size composition of the rock at the top and bottom of the ore layer. 8. Petrophysical and mechanical properties related to drilling construction. Among the above conditions, it is generally considered that ore permeability is a decisive condition for whether or not the earth immersion is technically feasible. The ore grade and material composition, the ore body thickness and the burial depth are important conditions for whether the leaching is economically reasonable. The main advantages of in-situ leaching compared to conventional mining methods: 1. Since there are no expensive and heavy wells or stripping projects, and there are no processes such as rock blasting, ore transportation and crushing, the capital investment is small, the construction period is short, and the production cost is low. 2. Good environmental protection, basically does not damage farmland and forests, and does not pollute the environment. 3. Fundamentally improved the labor and health care conditions of production personnel. 4. “Chemicalizationâ€, “factoryization†and full automation of heavy and poor mining operations. 5, can make full use of resources, such as some of the poor ore, buried ore bodies, scattered small ore bodies and hydrogeological engineering conditions complex deposits, mining by conventional methods are often inexperienced, even technically not feasible, and land Immersion is often quick and easy. The main disadvantages of in-situ leaching mining methods: 1. It is only suitable for deposits with certain conditions, and the scope of application is limited. 2. If the mineralization is uneven, the ore cementation degree and permeability of each part of the ore layer are not uniform; or some useful components in the ore are difficult to leaching, the total recovery rate of the resources is relatively low. 3. If ammonium carbonate and ammonium bicarbonate are used, or cyanide is used, the purification of groundwater in the ore layer is difficult. Atmospheric Dyeing Machine,Atmospheric Yarn Dyeing Machine,Atmospheric Fabric Dyeing Machine,Atmospheric Garment Dyeing Machine HESHAN CITY HONGFA COMPLETE SOLUTIONS MACHINE LTD. , https://www.hshongfamachine.com