There are two common types of lithium mica mills, namely LM vertical mill and MTW European mill, which are often used in the lithium mica milling industry, so how much capacity can the lithium mica mill reach per hour is a problem that customers pay more attention to.
The methods of lithium extraction from ore mainly include sulfuric acid method, sulfate method, lime sintering method, chlorination roasting method, etc. These ore lithium extraction processes have spodumene milling links. Henan Liming Heavy Industry is a lithium ore mill manufacturer, today I will sort out and introduce you to the process summary of ore lithium extraction.
Sulfuric acid method to extract lithium carbonate from spodumene is the current more mature ore lithium extraction process, this method first the natural spodumene at 950-1100 °C roasting, so that it from monoclinic crystal system of α-spodumene into tetragonal crystal system of β-spodumene, due to the crystal form transformation, the physical and chemical properties of minerals also change significantly with the change of crystal structure, chemical activity increases, can react with acids and alkalis. The procedure is as follows:
Roasting: weigh a certain quality of spodumene and roast it at 1000-1100 °C for 30 minutes; Spodumene milling: it is finely ground to less than 200 mesh by a lithium ore mill; Acidified roasting, sulfuric acid (93%-98%) dosage is 140% of the theoretical dosage, roasting temperature 250 °C, roasting time is 30 minutes; Water immersion, the acidified clinker is stirred and leached with deionized water for separation, and CaCO is added after the end of leaching to quickly neutralize to about pH, so that part of the iron and aluminum enters the slag, and the leachate is filtered to obtain the leachate; The leachate is purified and can be used for the extraction of lithium carbonate.
The sulfate method is to use potassium sulfate and natural spodumene sintering to convert the lithium in the ore into lithium sulfate, and the lithium can enter the solution from the ore through clinker dissolution. The specific operation steps are as follows:
The optimization conditions of roasting, roasting stage are: temperature 940 °C, time 120 minutes, ratio of lithium mica: KSO: NaSO: CaO=20:24:24; Leaching, the first step: water immersion. The roasting product was dissolved in water according to the liquid-solid ratio of 3:1, stirred for half an hour, and then allowed to stand and filter. Tertiary leaching of the filter residue to combine the filtrate; Step 2: Acid leaching. Since water leaching makes 80% Li, 80% Na, 30% potassium into the solution, further acid leaching is required to improve the leaching rate of Li, the leaching operation is the same as above, using tertiary acid leaching, the liquid-solid ratio is 3:l; In addition to impurities, in the process of adjusting the pH of the leaching solution, it was found that when the pH was > 6, white flocculent Al(OH) precipitation began to appear, and when the pH > 8, the white precipitate no longer increased, indicating that Al(OH)3 was basically completely precipitated. Continue to add alkali to increase the pH, and when the pH > 10, reddish-brown Fe(OH)3 begins to appear. Precipitation, when the pH > 13, the reddish-brown precipitate no longer increases, indicating that Fe(OH)3 is basically complete precipitation. Filtration to obtain purification liquid; Precipitate lithium, heat the solution to about 95 °C, and add Na2CO3. solution, white powder precipitate is produced in the solution, a filter cake about 1cm thick is formed on the filter paper after filtration, washed with hot water 3 times, the filter cake is put in a 200 °C oven for drying for 3 h, weighed, and dissolved into 60mL of dilute sulfuric acid solution for detection. The filtrate is collected and left for testing.
The lime sintering method is to sinter lime or limestone with lithium-containing ore, and then dissolve the sintered block to prepare lithium carbonate.
The process includes several main processes such as raw meal preparation, roasting, leaching, washing, leaching liquid concentration, purification and crystallization. After the limestone is finely polished, it is batched according to the mass ratio of lithium minerals and limestone, and a certain calcium oxide is prepared into a qualified raw meal, which is put into a rotary kiln for reaction at a certain temperature, so that the lithium in the mineral is converted into a water-soluble compound. The insoluble impurities are removed by the leaching process, and the leaching solution based on lithium compounds can be obtained by filtration and separation, and CO2 gas, waste furnace gas or sodium carbonate are introduced into the leaching solution to precipitate lithium in the form of poorly soluble carbonate. After washing and drying, lithium carbonate products are obtained.
The chlorination method is the use of chlorinating agents to convert lithium and other valuable metals in ore into chloride, and then extract metals and their compounds. The process steps for lithium extraction by chlorination roasting are as follows:
Ingredients, according to the ratio of lithium mica: NaCl: CaCl = 1:1, enter the lithium ore mill to grind finely, evenly mix, obtain qualified raw meal, and make pellets; Roasting, the temperature is controlled at 900-950 °C during the roasting process; The flow ratio of water leaching, leachate and clinker is , temperature and room temperature; In addition to calcium, according to the content of calcium ions in the leachate, calculated according to the reaction CaCl + Na2CO3 = CaCO3 + 2NaCl, an excess of 2 % was added to solid Na2CO3 powder or returned lithium mother liquor, and reacted at 90 ~ 95 °C; Evaporation precipitates NaCl, cooling precipitates, precipitates lithium.
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