Continued on the table 
2. Multi-stage grinding multi-stage sorting process In recent years, the selection of multi-stage grinding multi-stage sorting process has gradually increased, accounting for 40% of the selected plants, and many of them are smaller plants. Some processing plant (Huangshaping, silver mountain, river three Huangyan, Qingshuitang) currently used for some grinding process useful minerals monomer dissociation degree is not enough, to be appropriate grinding fineness further study, and intends to carry out multi-stage processes belong Re-grinding is used in the selected circuit (crude concentrate regrind, medium mine regrind). The selection plant (original Xiuyan plant) using the stage grinding stage flotation is less. [next]
Some of the plants have improved their indicators due to the increased fineness of grinding. Fankou plant originally used a section of grinding (70%-200 mesh) and medium mine re-grinding, soda- zinc sulfate separation process, since April 1980 changed to two sections of continuous grinding (82%-200 mesh), Crude concentrate regrind (95%-200 mesh) and lead circuit "high alkalinity process". After adopting the process and process, the lead concentrate grade was increased from 43.79% to 52.67%, the recovery rate was increased from 75.79 to 79.1%, and the zinc concentrate grade and recovery rate were also slightly improved. SKS ore dressing plant using the regrinding jobs, improve the level of useful mineral qualified grain yield, eliminate the loop coarse pyrite buoyant problems, improved lead concentrate grade of 0.78%, 1.57% recovery; refined zinc The grade of mineral is 7.59% and the recovery rate is 0.36% (see table below).
Comparison table of lead, zinc and sulfur indicators (from May to December of 81) | |||||||||
index | Original ore grade % | Concentrate grade % | Recovery rate% | ||||||
Process | Pb | Zn | S | Pb | Zn | S | Pb | Zn | S |
Medium mine regrind | 2.78 | 4.5 | 12.88 | 63.48 | 52.71 | 24.34 | 86.67 | 91.27 | 65.08 |
Mine is not ground | 2.52 | 4.37 | 12.91 | 62.7 | 51.12 | 41.6 | 85.1 | 90.91 | 66.52 |
Middling regrinding and also enhance the recovery of gold and silver enrichment. If the gold and silver in the ore are lower than when the mine is not milled, the recovery rates of gold and silver increase by 6.25% and 5.40%, respectively (see table below).
Comparison table of gold and silver enrichment indicators (from May to December of 81) | ||||||
index | Raw ore grade (g / ton) | Enrichment in lead concentrate (g/ton) | Recovery rate (g / ton) | |||
Process | Au | Ag | Au | Ag | Au | Ag |
Medium mine regrind | 1.05 | 63 | 9.08 | 1321 | 41.23 | 78.86 |
Mine is not ground | 1.06 | 65 | 9 | 1460 | 35.05 | 75.46 |
The experimental research shows that the grain size of silver minerals in lead-zinc ore is generally fine, and the fineness of grinding for lead-zinc minerals does not necessarily meet the requirements of silver mineral monomer dissociation. In order to effectively enrich silver in copper- lead concentrates, for many plants, increasing the fineness of grinding and adopting a multi-stage grinding process is an effective measure to increase the recovery rate of silver.
Sorting and fine grinding of lead and zinc ore beneficiation plant in recent years, the main trend change process multi-stage multi-stage grinding.
3. Branch speed separation flotation process
The branch-by-speed flotation process is still a novel process in the multi-metal flotation process at home and abroad. It can improve the ore grade for mines with poor ore grades. The refractory and fine-grained parts of the pulp can be The coarse-grained easy-floating product (foam) with a fast floating speed is used as a carrier to be floated back; the remaining amount of the drug can be reduced by the remaining agent in the previous foam product, and all the rough-selected foam products can be concentrated in The latter's selection of treatments or split speeds, etc., are considered to be good conditions for improving the indicators. In the technical transformation of the third beneficiation process of the Yinshan Mine Concentrator in 1982, the branch speed separation flotation process and the excellent lead-zinc-sulfur mixed-zinc-sulfur sorting process can be combined to carry out technical transformation. good effect.
The mine is a polymetallic sulfide ore deposit with medium-temperature hydrothermal fissure filling. The main ore body is surrounding rock sericite phyllite, followed by pyroclastic rocks. The main metal minerals are galena, sphalerite, pyrite, chalcopyrite, silver ore and silver-bearing minerals, followed by beryllium copper, magnetite and siderite. The gangue minerals are quartz , sericite, calcite , dolomite, chlorite, kaolin , feldspar, etc.
Conveyor Belt Stripper,Rubber Strip Cutting Machine,Rubber Belt Stripper,Belt Stripping Machine
SUZHOU ARPHU INDUSTRIAL CO., LTD , https://www.arphuind.com