Lithium carbonate is an important raw material in the production of anodes in the lithium battery industry. It is mainly used to manufacture electrode materials such as lithium cobaltate, lithium nickelate, and lithium manganate. It is also used as a non-aqueous electrolyte in rechargeable lithium batteries. It has good electrochemical properties. Performance and application fields are still expanding.
The main content of industrial-grade lithium carbonate (Li2CO3) is ω/% on a dry basis, the qualified product of industrial-grade lithium carbonate is ≥99%, and the superior product is ≥99.3%, which is higher than GB/T 11075-2013 "Lithium Carbonate" and GB/T 23853- The index in "Lithium Carbonate in Brine" in 2009; battery grade lithium carbonate ≥ 99.5% is consistent with the main content in YS/T 582-2013 "Battery Grade Lithium Carbonate" standard.
In addition to adding calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), iron (Fe), silicon (Si), (Cu), lead ( In addition to the detection limits of elements such as Pb), nickel (Ni), manganese (Mn), zinc (Zn), aluminum (Al), the detection limits of boron (B) and chromium (Cr) have been added. At the same time, the limits of various trace elements in the indicators are higher than or equal to the relevant domestic lithium carbonate standards, especially elements such as iron (Fe), lead (Pb) and silicon (Si).
Tulsimer®CH-93 has great performance advantages in the removal of impurities in lithium salt solution. It can reduce calcium, magnesium and other divalent cations under the premise of ensuring the concentration of lithium ions. Tulsimer®CH-99 can selectively remove The boron element in the solution, Tulsimer®CH-90Na and Tulsimer®RCX-5143 can effectively remove metal thallium in the wastewater of lithium battery industry, and the effluent index can be as low as 0.1μg/l.
Tulsimer ®CH-93
New energy mother liquor removal of impurities, removal of calcium and magnesium chelating resin
Tulsimer® CH-93 is a macroporous resin of polystyrene copolymer loaded with aminomethylphosphonic acid functional groups, which can remove more than divalent metal ions, such as calcium and magnesium, in high saline environment.
CH-93 is commonly used in the field of new energy to remove impurities in lithium salt solutions, such as lithium bicarbonate, lithium sulfate and other solutions to purify and remove calcium and magnesium ions, and the concentration of calcium and magnesium ions can be reduced by 0.01mg/l. In addition, its superior physical and chemical properties can not only ensure the effective removal of calcium and magnesium ions, but also will not cause loss of lithium salt concentration in the mother liquor, which has very large economic benefits.
CH-93 Resin Parameters
Applications
For a new energy company's calcium and magnesium removal project, the content of calcium and magnesium in the water is 100mg/l. The project requirement is to achieve calcium and magnesium less than 5mg/l. Kehaisi combines the performance advantages of CH-93 resin and adopts series operation according to the specific conditions of the project. The process removes calcium and magnesium ions in a high-salt environment through phosphonic acid functional groups.
The lithium bicarbonate solution after preliminary impurity removal and filtration enters the resin column, and the calcium and magnesium ions in the solution are selectively adsorbed by the chelating group on the resin. After the resin is selectively adsorbed, the product water flows out is a qualified solution of lithium bicarbonate. At the same time, as more and more calcium and magnesium are adsorbed on the resin and finally reach saturation, stop feeding and start to regenerate the resin, use hydrochloric acid to elute the saturated calcium and magnesium ions, and then use sodium hydroxide to transform the resin. In this way, the resin returns to its original state and periodically adsorbs calcium and magnesium ions.
Project acceptance, calcium and magnesium content from 100mg/l into the water to below 1mg/l, and the effluent is stable.
Tulsimer® CH-90Na
Cobalt, nickel, thallium chelating resin
Tulsimer® CH-90Na is a macroporous selective chelation ion exchange resin with iminodiacetic acid functional groups, especially suitable for the adsorption of heavy metal ions, such as copper, cobalt, nickel, thallium, etc. Its macroporous resin structure ensures superior ion diffusion, giving higher removal rates and regeneration performance. CH-90Na resin can remove metal ions from low pH solutions and is a cost-effective method.
CH-90Na resin parameters
Applications
The cobalt removal project of a new material company in Gansu, the cobalt content is about 2mg/l, and the treated water volume is 25m³/h. Combining the advantages of CH-90Na resin with specific selectivity to cobalt, etc., Kehaisi adopts precipitation system + filtration system + The chelating resin system process, through the chelating resin to withstand high salt water, selectively adsorbs cobalt, and the cobalt content in the effluent is below 0.05mg/l.
Tulsimer® RCX-5143
Macroporous weakly basic anion resin
Tulsimer® RCX-5143 is a very durable, macroporous weak base anion exchange resin with a complex amine group character, belonging to a styrene-divinylbenzene copolymer matrix, in the free base form.
RCX-5143 resin is suitable for removing heavy metals, such as molybdenum and rhenium, from acidic treatment solutions, and can also effectively remove metal thallium in wastewater from the lithium battery industry, and the effluent index can be as low as 0.1μg/l. At the same time, RCX-5143 has very stable operation performance in the process of sodium hydroxide regeneration.
RCX-5143 resin parameters
case application
A non-ferrous metal company's sewage acid system thallium removal project has a thallium content of 10-20mg/L in the water, and the treated water volume is 2-3 tons/hour. Combining the performance advantages of RCX-5143 resin, Kehaisi adopted the filtration + oxidation + resin process , the monovalent thallium ion becomes a trivalent form after the oxidation process, and then complexes with the chloride ion to form a tetrachloride thallium anion complexing group. After the macroporous weak base resin RCX-5143 is saturated, the reducing agent sodium sulfite Re-transform trivalent thallium ions into monovalent cations and peel them off from the resin to achieve regeneration. The single-stage operation of the project has achieved 0.01mg/L of effluent.
Tulsimer ®CH-99
boron selective adsorption resin
Tulsimer CH-99 boron selective adsorption resin is a selective ion exchange resin for the removal of boron and its salts in aqueous solution. In some chemical industries and agricultural water, trace amounts of boron or boron salts may be very serious problems. CH-99 resin can effectively remove boron and boron salts in a larger pH range and even in solutions with other ions, and has a higher order of magnitude.
CH-99 Resin Parameters
case application
The boron content of the boron removal project of an environmental protection technology company is 23mg/l in the water, and the treated water volume is 1t/h. Combining the performance advantages of CH-99 boron removal resin, Kehaisi adopts single-stage operation, and the effluent reaches 1mg/l.
The principle is that the chemical structure of CH-99 resin can generate complex anions between the polyhydroxyl part and boron in the functional group, and the amine part serves as an anion exchange group to capture the generated complex anions, thereby selectively adsorbing boron ions, and CH-99 resin is not affected by a large amount of coexisting salts, and its reaction is very sensitive to pH value. Complex ions can only be generated in neutral or alkaline solutions, and complex ions are decomposed in acidic solutions.
