Limestone lithium hydroxide workshop design

Limestone LITHIUM HYDROXIDE plant design (design of lithium hydrate shop by calcite process) or spodumene lepidolite concentrates as raw limestone to produce single method for Lithium hydroxide monohydrate smelter car asked design. The process consists of fine grinding, baking, leaching, evaporation, crystallization, refining, drying, packaging and mother liquor processing. The process flow is shown in the figure.

Generally, the spodumene concentrate contains Li2O≥6%; the lithium mica concentrate contains Li2O4.3%~4.8%; the auxiliary material limestone contains CaO≥54% and SiO2≤1%. The concentrate is wet-milled by the ingredients to prepare a slurry with a fineness of less than 0.074 mm and a water content of 34% to 36%. After being formulated in the slurry tank, a qualified raw slurry containing 40% to 42% of CaO is obtained, and the raw slurry is 1150. The mature material is calcined by the rotary kiln at a temperature of ~1250 ° C, and the clinker is wet-ground to a thickness of less than 0.074 mm by a liquid-solid ratio of 3:1 and a leaching at a temperature of 95 ° C for 3 hours. The leaching slurry filter slag is washed by water in the reverse direction at 95 ° C for three times and then sent to the slag yard for storage. The leaching solution is precipitated, concentrated by evaporation to LiOH containing 130 g/L and filtered, and then cooled at 40 ° C for crystallization. The crude lithium hydroxide monohydrate obtained is separated, re-dissolved with pure water and concentrated, crystallized or washed with lithium hydroxide saturated solution to remove potassium and sodium impurities, and the separated lithium hydroxide monohydrate is vacuum dried at 130-140 temperature. For the product. Extracting lithium as a paper mill for the final mother liquor with caustic soda; lepidolite to a final mother liquor as a raw material may further recovery of lithium, potassium, rubidium and cesium compounds and other elements.

Equipment selection The main equipment includes ball mill , batching tank, rotary kiln, filter, evaporator, crystallization tank and dryer. Calcined using a rotary kiln, feeding the wet, heavy oil or directly heated by coal powder, unit capacity: by clinker is 10 ~ 12kg / (m2 • h ) or 32 ~ 38kg / (m3 • h ), can also be used the empirical Formula calculation. G=0.552D2.88 where G is the kiln capacity, t/h; D is the kiln inner diameter, m. The evaporator for concentrating the leachate is heated by natural circulation, two-effect or three-effect, and its production capacity is 15-20 kg/(m2•h) according to the amount of evaporated water.

According to the characteristics of the process, the fire separation method (raw material to calcined mature material) and wet method (cure slurry to product) should be divided into two parts. In order to reduce energy consumption, facilitate operation and reduce mechanical losses, the rotary kiln kiln and product processes are placed on the upper floors.

Technical features Concentrate machines and rotary kiln must be operated continuously in production, requiring reliable power supply and water supply. The vacuum evaporation process has a large amount of steam condensation. The cooling water is generally recycled; the lithium slag produced per ton of product is contained. The amount of alkaline water is 7 to 13 tons. When stacking, it is necessary to prevent the alkali solution in the slag from contaminating the soil and water.

The main technical and economic indicators for the production of lithium hydroxide monolithic lithium hydroxide production specifications are: Product quality LiOH not less than /% 56.5 CO2 is not greater than /%0.35 Cl - not greater than /% 0.003 SO4–– no greater than /%0.01 Na Not more than /%0.002 CaO Not more than /% 0.02 Acid insoluble matter (in HCl) Not more than /% 0.002 Total recovery of spodumene concentrate as raw material /% 78～80 Unit consumption (1t product) Spodumene Concentrate (Li2O 6%) /t 6.85～7.12 Limestone (CaO54%)/t 19～21 Water/t 200～300 Electricity/kW•h 6000～6500 Steam/t 70～80 Lithium mica concentrate Total recovery rate/% 62～65 Unit consumption (1t product) Lithium mica concentrate (Li2O4.5%)/t 12.6～12 Limestone (CaO54%)/t 36～38 Water/t 300～350 Electricity/kW •h 8000～8500 steam/t110～120

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