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Design of primary ore selection plant for strontium iron ore-ironite ore
Yichun Ta-Nb ore beneficiation plant
Yichun Ta-Nb ore located in Yichun, a system of albite - Large deposits lepidolite granite containing tantalum and niobium, lithium, rubidium, cesium, more noble metals - greisenization. The ore contained (TaNb) 2 O 5 0.03% (Ta: Nb = 1.8: 1), Li 2 O 0.861%, Rb 2 O 0.284%, and Cs 2 O 0.07%. Tantalum and niobium rich minerals iron manganese niobium tantalum ore, microlite, tantalum-containing cassiterite. Lepidolite mainly lithium, beryllium mainly beryl, beryllium, sodium phosphate rock. Most of them are found in lithium mica. The gangue is mainly feldspar and quartz . Minor amounts of other minerals are topaz, magnetite, hematite, titanium, iron, manganese mineral apatite and the like. Mineral grain crystal: manganese-rich coltan and strontium-containing samarium, generally 0.3-0.1 mm, fine-grain is generally 0.2-0.08 mm. The mine is an important raw material base for the bismuth, lithium and glass and ceramic industries in China.
The size of the ore dressing plant is 1,500 tons/day. The dressing process is shown in Figure 1. It is divided into washing and crushing section, grinding re-election section, primary fine mud section, secondary fine mud section, lithium mica flotation workshop and feldspar powder recycling workshop. The ore (-800 mm) is washed by the ore washing machine by vibration. The material on the sieve (>130 mm) is coarsely crushed by a jaw crusher, crushed in a standard cone crusher, and crushed by a short-head cone crusher. The final crushing size is -25 mm. The undersize material (<130 mm) is fed into a vibrating screen and a spiral classifier. The spiral classifier overflow (<0.2 mm) is sent to the original slime section, which is concentrated, de-sludged, graded, and sorted by a shaker. The spiral classifier grit (>0.2 mm) is fed into the rod mill together with the finely divided product. The grinding size is -0.5 mm, which is closed with the ZS linear screen. Less than 0.5 mm of material is fed into the magnetic separator to select iron minerals and iron filings. The non-magnetic material is fed to the spiral classifier, and the spiral grit is selected through a spiral chute-shaker to select a part of the antimony concentrate. The tailings are fed into a ball mill , ground to 0.2 mm, combined with a spiral overflow (-0.2 mm), classified by magnetic separation, de-sludge and hydraulic classifier, and centrifuged with secondary mud (primary slime and primary slime). The concentrator is rough-selected, the belt chute is selected, and the belt chute tailings are swept by a shaker. Grade 1 to 4 grade materials are sorted by spiral chute-shaker to select niobium concentrate. The tailings are fed into the φ250 mm cyclone to remove the fine mud, and the cyclone bottom stream is mixed with the amine as a collector to select the lithium mica concentrate. Flotation tailings, ie feldspar powder, are high-quality raw materials for glass ceramics.
Production index: 钽铌 concentrate grade 44.91% (TaNb) 2 O 5 , recovery rate 45.6%; lithium mica concentrate grade 4% ~ 4.5% Li 2 O, operation recovery rate of about 60%, does not recycle feldspar powder.
Chestnut Mine New Wood Tin-钽铌-Tungsten Concentrator
Limu Mine is located in the Guangxi Zhuang Autonomous Region. It is a tin, tantalum and tungsten granite polymetallic deposit. The ore contained Sn 0.1377%, (TaNb) 2 O 5 0.0229% (Ta: Nb = 1:1), and WO 3 0.0257%. The tin minerals are mainly cassiterite, and the small amount is bismuth tin or colloidal tin. The strontium minerals are mainly strontium manganese ore, manganese strontium ore, coltan, and fine spar. The tungsten mineral is mainly black tungsten ore. The gangue is mainly composed of quartz and feldspar. Mineral grains: cassiterite is generally below 0.2 mm, and strontium minerals and scheelite are generally between 0.1 and 0.05 mm. Production of fine tin, potassium fluoroantimonate, cerium oxide, cerium oxide, cerium hydroxide, cerium oxide, ammonium tungstate, tungsten oxide and other products. The whole process consists of three parts: roughing plant, selected plant (including tin fire smelting section) and water smelting plant. It is China's first joint mining-selection-smelting joint venture.
Figure 1 Yichun Yankuang Concentrator Process
The roughing plant uses a two-stage crushing, two-stage grinding jigging-spiral-shaker flow chart 2. The ore (300 mm) is sieved through a 70 mm rod sieve, and the ore larger than 70 mm is fed to a 400 x 600 mm jaw crusher . In the coarsely crushed product, the material larger than 25 mm is crushed to -25 mm by the φ900 mm standard cone crusher, and sieved through a double-layer vibrating sieve. The material larger than 3 mm is fed into a 2100×3000 mm rod mill with a grinding size of 0.3 mm. The rod mill and the curved screen and the spiral classifier form a closed circuit. Less than 0.3 mm material is fed into the trapezoidal jig, and the jigging concentrate is used to select part of the coarse concentrate from the spiral chute-shaker. The tailings are fed into the ball mill and ground to 0.15 mm. The graded bucket is graded, and the graded bucket overflow (-0.15 mm) is a graded shaker. Grading bucket sand (+0.15 mm) first select some concentrates with a shaker, discard some of the tailings, and then return the mine in the shaker back to the grinding circuit, thus achieving “early harvest early†and avoiding over-grinding broken. The jigging tailings are classified and de-sludged by φ500 mm, φ300 mm, φ125 mm and φ75 mm cyclones, and the cyclone grit is sorted by a shaker. The cyclone overflow is selected by centrifugal concentrator and the belt chute is selected. The obtained tin-bismuth-tungsten total coarse concentrate contains Sn12.54%, (TaNb) 2 O 5 1.641%, WO 3 31.139%, coarse selection recovery: Sn 52% to 53%, (TaNb) 2 O 5 41% to 42%, WO 3 64% to 65%, sent to the selection plant for further processing. Tailings are glass and ceramic raw materials.
Figure 2 Chestnut mine new wood rough selection plant process
The selected plant (including the tin smelting section) adopts the joint process of smelting and smelting (see Figure 3). The tin-bismuth-tungsten mixed coarse concentrate from the roughing plant is firstly stirred and washed with 7% hydrochloric acid at a temperature of 80 ° C, then classified by a hydraulic classifier, dewatered by a hydrocyclone, and sorted by a shaker. operation. The shaker is selected to remove the iron minerals by a weak magnetic field magnetic separator, and then the magnetic and non-magnetic minerals are sorted by a dry magnetic separator. The magnetic mineral group is treated by the smelting and smelting plant of coltan-tungsten ore (ie strontium-tungsten mixed concentrate). The non-magnetic mineral group is cassiterite-sulfurized mineral, and then the sulphide ore is removed by flotation re-election, and the obtained tin concentrate is sent to the smelting section to be refined into tin. The tin slag still contains (TaNb) 2 O 5 10%~12%, which is sent to the water and metallurgical plant for treatment. The fine mud produced in the process is concentrated into the sedimentation tank, and then classified by a φ300 mm and φ125 mm cyclone, and the underflow of the cyclone is sorted by a spring shaker. The cyclone overflow is sorted by a circular slot. The selected fine mud concentrate is calcined and leached by soda, and the leaching slag is sent to the fire smelting plant for treatment to obtain refined tin and strontium slag. The leached tungsten solution is purified and synthesized to synthesize white tungsten , which is sent to the water and metallurgical plant together with the strontium-containing slag. Selected indicators: refined tin containing Sn99.8%, recovery rate of 76% ~ 85%; tin slag containing (TaNb) 2 O 5 10% ~ 12%. The cerium-black tungsten mixed concentrate contains: (TaNb) 2 O 5 17%, WO 3 37%, Sn 6%, recovery: (TaNb) 2 O 5 87%, WO 3 90%.
Figure 3 Chestnut Mine Selection Plant Process
Water metallurgical plant
Sodium carbonate roasting, hydrofluoric acid decomposition, and secondary octanol extraction are used (Fig. 4). The whole process consists of three parts: enrichment section, helium extraction separation section and tungsten-tin comprehensive recovery section. First, the bismuth-black tungsten mixed concentrate and the strontium-containing slag are sent to the enrichment section for batching (concentrate: soda ash: carbon powder = 1:0.4:0.06; tin slag: soda ash: carbon powder = 1:0.25: 0.05) Grinding [(-0.15 mm) > 95%], roasting (800 ~ 900 ° C), grinding, boiling, leaching, filtration and other processes. The tungsten-containing solution is sent to the tungsten-tin comprehensive recovery section to remove phosphorus, arsenic and silicon by magnesium salt purification method, and then calcium chloride (CaCl 2 ) is added to synthesize scheelite, and then hydrochloric acid is decomposed and ammonia is purified to produce industrial grade tungsten oxide. The filter residue is subjected to a process such as desiliconization with dilute acid, boiled hydrochloric acid, filtration, etc., and the filtrate is reduced by iron filings and electrowinned to produce an electropositive tin containing 75% to 85% of Sn at the cathode. The slag is the artificial bismuth concentrate, the extraction separation section is decomposed with hydrofluoric acid, the octanol is extracted, the hydrazine enters the organic phase, the ruthenium 2NH 2 SO 4 is added back-extracted hydrazine solution, and the ruthenium extract is extracted with pure water.钽 solution. The cerium solution is subjected to ammonia precipitation and calcination to obtain cerium oxide (containing Nb 2 O 5 98.72%) product; the cerium solution is subjected to ammonia precipitation and calcination to obtain cerium oxide (Ta 2 O 5 99.84%) and potassium fluoroantimonate product. Water and metallurgical index: yttrium oxide grade 99.84% Ta 2 O 5 , yttrium oxide grade 98.72% Nb 2 O 5 , hydrazine smelting recovery rate 85.97%; tungsten oxide grade 99.8% WO 3 , tungsten smelting recovery rate 81%.
Figure 4 Process of Limu Mine Water and Metallurgical Plant