41results about How to "Lower magnesium levels" patented technology

The invention provides a method to produce a low-magnesium battery grade lithium carbonate from lithium sulfate solution. The method comprises the steps that: (1) purification treatment of lithium sulfate solution as following: lithium sulfate solution is co-precipitated to lower the impurities ions Fe3+, Mg2+, Al3+ and Ca2+, and condensed and filtered to further eliminate impurities, and obtain purification residues and a pure finish solution of lithium sulfate; (2) soda is dissolved and added with purification residues obtained from the purified lithium sulfate solution, and used for a filtering media to filter calcium and magnesium and obtain purified soda solution; (3) the purified soda solution is added with complexant EDTA, and stirred for complexation reaction, and slowly added with condensed and impurities eliminated pure finish solution of lithium sulfate, and a crude lithium carbonate is prepared; (4) the crude lithium carbonate is stirred, cleaned, dried and smashed, thus obtaining the low-magnesium battery grade lithium carbonate. The method of the invention has the advantages of simple production technique, stable product quality and low cost, and expertly employs the waste residues in the process, not only solves the difficulty of impurities elimination for soda, but also enhances the recycling ratio of lithium, which is suitable for the production application of the positive pole material of Li-ion battery.

The invention relates to an integrated nitrogen and phosphorus recovery device with low energy consumption, which comprises a vertical tank body; the bottom of the vertical tank body is provided with a water inlet ejector; a dosage adding device and a water inlet pipe are connected with the water inlet ejector; one end of a clear water outlet pipe is communicated with the top of the vertical tank body; and the integrated nitrogen and phosphorus recovery device is characterized in that: a fluidization area is arranged on the middle and lower part in the vertical tank body; struvite seed crystal particles are arranged in the fluidization area; the center of the fluidization area is provided with a guide mixer; a space of the tank body under the guide mixer is a water distribution area which is communicated with the water inlet ejector; the top of the vertical tank body is provided with a lifting device; and the guide mixer is arranged on the output shaft of the lifting device. The integrated nitrogen and phosphorus recovery device has the advantages that the integrated nitrogen and phosphorus recovery device quickens the mass transfer process of a system, greatly reduces running cost and operation difficulty, improves interception efficiency and recovery effect of nitrogen and phosphorus, has simple and convenient engineering design and short installation period of construction, does not need external reflux, and has low energy consumption of internal reflux, frequency conversion and speed regulation, easy control of magnesium source externally added, and low content of magnesium in the outlet water.

Nickel sulfide in low-grade ores is mainly recycled by a flotation method, but the defect is that the content of MgO in concentrate is high. As magnesium-containing minerals are high in smelting point and poor in mobility, when the content of MgO in concentrate is higher than 6.5%, adverse effects such as furnace body nodulation and furnace body corrosion are brought to a follow-up novel flash smelting process of nickel. In order to solve a problem that the content of magnesium in concentrate is high during separating of magnesium-nickel containing minerals, the invention provides a method for lowering the content of magnesium in pentlandite concentrate. The method comprises the following steps: adding surface conditioning agents such as sodium hexametaphosphate into the pentlandite concentrate, and uniformly dispersing ore pulp by stirring; then, adding magnetic seeds and a surfactant, and stirring to ensure that the magnetic seeds and the pentlandite concentrate generate adhesion agglomeration; and performing magnetic separation, thereby obtaining the pentlandite concentrate with the content of magnesium being lower than 6.5% (in terms of MgO). The method disclosed by the invention has the advantages of being good in pentlandite separation selectivity, environmentally friendly, low in energy consumption, easy to operate, high in efficiency, and the like, and solves a problem that the content of magnesium in nickel concentrate is high.

The invention discloses a precipitated calcium carbonate production technology for reducing magnesium and increasing calcium. The technology comprises the steps as follows: 1) a desulfurizing tower is serially connected with a washing tower in kiln gas purification, and a desulfurizer is added to a liquid phase of the desulfurizing tower, so that the purification effect of a kiln gas is improved, and meanwhile, the dosage of circulating water is reduced; 2) a raw slurry pre-ageing process and a dynamic ageing process are adopted, the "back-mixing" phenomenon is avoided, and the ageing time of the raw slurry is ensured; 3) a carbonation reaction kettle adopts a stirring apparatus with three layers of paddles, so that the carbonation reaction time is shortened, and the utilization rate of the kiln gas is increased; 4) magnesium is separated out from mother liquor from which calcium carbonate is separated out by adopting a steam pyrolysis method, filtrate is returned to a digestive process, and cyclic utilization of water is achieved. The precipitated calcium carbonate product obtained by the technology is small in grain size (D50 is approximate to 4mu), high in whiteness (greater than or equal to 94), low in magnesium content (MgO is smaller than or equal to 0.5%), and low in alkalinity (pH is smaller than or equal to 9), and is more applicable to the industries of plastic steel and the like with special demands on the magnesium content, the whiteness, the alkalinity and the like besides of meeting the industries such as rubber, plastic, papermaking and coatings.

The invention discloses a method for preparing refined industrial salt low in calcium and magnesium by utilizing an underground denitration process. The method disclosed by the invention comprises the following steps: (1), injecting alkali production calcium liquid in a well and extracting brine; (2), underground removing sulfate radicals and magnesium; (3), surfacely removing calcium; (4), producing salt in vacuum; and (5), returning salt production mother liquid in the well and denitrating. The content of calcium and magnesium in industrial salt produced by the method disclosed by the invention is less than or equal to 0.05%, and therefore, the content of calcium and magnesium is far less than that in industrial salt produced by the traditional methods.

The invention relates to the technical field of phosphorite quality improvement, particularly a sodium fluosilicate production-phosphorite demagging combined treatment method. Sodium sulfate and wastewater generated in the wet-process phosphoric acid sodium fluosilicate coproduction process are utilized and returned to the phosphorite demagging treatment technique so as to utilize the residual sulfuric acid and fluosilicic acid and remove the magnesium element in the phosphorite, thereby enhancing the phosphorite grade. In the treatment process, since the content of sulfuric acid in the wastewater in the fluosilicic acid coproduction process is lower and the fluosilicic acid content is lower, the raw materials added into the reaction kettle for phosphorite treatment have low corrosiveness to the equipment, thereby lowering the cost for the phosphorite grade enhancement treatment. The sulfur element and fluorine element in the sodium fluosilicate sewage can not be abundantly discharged into the environment, thereby providing a new way for sodium fluosilicate sewage treatment, relieving the sodium fluosilicate wastewater treatment load and lowering the environmental pollution.

The invention provides cement produced by utilizing industrial solid wastes. The cement is prepared from the following raw materials: 77.00-82.50% of clinker, 0.30-7.90% of blaster furnace slag, 1.60-5.55% of desulfurization gypsum, 2.90-7.60% of waste rocks, 0-1.00% of high-silicon sandstone, 0.70-6.70% of fly ash, 0-12.00% of high magnesium waste rock, 0-2.40% of phosphogypsum and 0-0.80% of titanium gypsum, wherein the clinker is prepared from the following raw materials: common limestone, marble sawdust, marble leftover material, high magnesium waste rock, sandstone, red clay and wet-discharged fly-ash. According to the cement, the cement raw material is prepared by using the marble sawdust and leftover material, the waste residue utilization rate is high, and lots of natural resources and energy can be saved. Meanwhile, the high magnesium waste rock is used for preparing the raw material and serves as a mixed material of the cement to be simultaneously used, and the utilization rate of the high magnesium waste rock is greatly improved.

The invention provides a method for purifying manganese sulfate in a magnesium-rich manganese sulfate solution. The purification method comprises the following steps: S1, performing primary high-temperature crystallization on a magnesium-rich manganese sulfate solution to obtain primary crystallized crystals; and S2, carrying out secondary high-temperature crystallization on the primary crystallized crystal to obtain a secondary crystallized crystal. The smaller the mass ratio of manganese to magnesium in the manganese sulfate solution is, the more difficult the manganese and the magnesium areseparated, and when the temperature is higher than 100 DEG C, the solubility of manganese sulfate is negatively related to the temperature. Most magnesium in the manganese sulfate solution with the mass ratio of manganese to magnesium being lower than 5 is removed through a high-temperature crystallization method, so that the method for purification of the magnesium-rich manganese sulfate solution is simple in process and low in production cost.

The invention relates to a method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impactand maximum lithium recovery. The method is characterised in that it comprises the steps of: a) constructing ponds for fractional crystallisation based on solar evaporation; b) filling the ponds withnatural brine; c) initially pre-concentrating the natural brine until the maximum possible lithium concentration in the liquid phase is obtained, without lithium-containing salts being precipitated; d) cooling the pre-concentrated brine obtained in step (c), ensuring the maximum precipitation of salts containing sulphate anion; e) chemically pre-treating the liquid phase of the brine separated from the salts precipitated by means of cooling in order to minimise sulphate anions in the liquid phase after cooling; f) finally pre-concentrating the pre-treated liquid phase until the maximum possible lithium concentration in the liquid phase is obtained, without lithium-containing salts being precipitated; g) chemically treating the liquid phase of the brine separated from the salts precipitatedin step (f) in order to minimise the concentration of magnesium, calcium, boron and sulphate in the liquid phase; and h) concentrating the liquid phase obtained in step (g).

The invention discloses a method for comprehensively recovering copper and cobalt from copper cobalt oxide ore. The method comprises the steps of size mixing, leaching, concentration thickening and washing, copper recovery, cobalt recovery from low-copper raffinate and the like. According to the method, under the conditions that the ore pulp concentration is high and the temperature of the ore pulp is increased to 60-85 DEG C through heat release of concentrated sulfuric acid, sulfide minerals and the copper sulfide slag obtained by treating the copper-containing solution through a sulfide precipitation method are adopted, and smelting soot obtained after the sulfide minerals are not completely oxidized replaces sodium pyrosulfite or sodium sulfite to serve as a cobalt leaching reducing agent; on one hand, the cost of the reducing agent is greatly reduced, and on the other hand, environmental unfriendliness caused by SO2 generated when sodium pyrosulfite or sodium sulfite is adopted as the cobalt leaching reducing agent in an acid environment is avoided. More importantly, under the conditions of high ore pulp concentration and high-temperature leaching, the leaching rate of copper and cobalt is increased, the leaching rate of harmful impurity silicon is greatly reduced, and the adverse effects of generation of silica gel on the subsequent procedures of sedimentation, extraction and the like are reduced.

The invention discloses a low-magnesium barium-containing spheroidized cored wire, and belongs to the technical field of ferrous metal materials. The core powder comprises the components of, in percentage by mass, 8%-12% of Mg, 45%-60% of Si, 1.5%-2.5% of RE, 5%-10% of Ba, 1.5%-3% of Ca, 0.5%-1.5% of MgO, 1.0%-1.5% of Al and the balance Fe. According to the low-magnesium barium-containing spheroidized cored wire, the spheroidizing function and the inoculation function are integrated, inoculation of cored wires is not needed any more, thus the magnesium content is reduced, the wire feeding timeof a small ladle with the weight being 500 kg or below is stably controlled to be 24-32 s, and the problem that due to the fact that the wire feeding time is too short, magnesium absorption is unstable in the small ladle spheroidizing process is solved; and the nodulizing cored wire is used for wire feeding and nodulizing, the content of residual Mg in molten iron is more stable than that of an in-ladle pouring method, and nodulizing of ductile iron is poor and pore waste is lower.

The invention belongs to the technical field of solution purification and separation, and discloses a process for enriching lithium in salt lake brine. After being pretreated, salt lake brine respectively passes through an adsorption device, an ultrafiltration device, a primary nanofiltration device, a reverse osmosis device I, a secondary nanofiltration device and an electrodialysis device to obtain a solution which can be directly used for preparing high-purity lithium. In order to reduce the pressure difference of the two sides of a reverse osmosis membrane and improve the recovery rate of lithium ions, electrodialysis produced water is conveyed to a reverse osmosis device I and mixed with reverse osmosis produced water I to serve as rear-end effluent of the reverse osmosis device I; an independent reverse osmosis device II is arranged to concentrate outlet water at the rear end of the reverse osmosis device I, and reverse osmosis concentrated water II and secondary nanofiltration produced water are mixed and then enter an electrodialysis device. The enrichment process provided by the invention is low in energy consumption and high in lithium recovery rate.

The invention relates to the technical field of aluminum alloy preparation, in particular to a high-performance aluminum alloy ingot for an electric vehicle and a preparation method. By adjusting an existing aluminum alloy ingot formula, the magnesium content is greatly reduced, the silicon content is improved, the original performance can be met, the performance is higher than the original performance, and the performance index is improved; in the aspect of cost saving, the cost per ton can be saved by more than 200 yuan, the tensile strength is improved to 220 MPa from original 180 MPa and is improved by 22% through the adjustment of the new formula, the ductility is improved to 3% from original 2% and is improved by 50% through the adjustment of the new formula, and the hardness is improved to more than 65 from original 50 HB and is improved by 30% through the adjustment of the new formula; and the problems that the reject ratio of an existing aluminum alloy die-casting product is up to 25% or above, the follow-up remelting loss is large due to the high magnesium content proportion, the requirement for the die-casting technology after remelting is strict, and the yield is low are solved.

The invention provides potassium magnesium sulphate composite crystal slow-release salt for improving the milk yield of dairy cows, and belongs to the technical field of livestock feed. The potassiummagnesium sulphate composite crystal slow-release salt comprises the following main components in percentage by weight of 50-60% of potassium magnesium sulphate crystal salt, 5-40% of a carrier and 5-40% of plant extract. The specific preparation method comprises the following steps of stirring and mixing the potassium magnesium sulphate crystal salt and the carrier, then adding the carrier, performing stirring and mixing uniformly, adding the plant extract, performing stirring and mixing for 5-10 hours, and finally performing drying to obtain the potassium magnesium sulphate composite crystalslow-release salt product. As a supplement of potassium and magnesium for ruminants, the the potassium magnesium sulphate composite crystal slow-release salt is consistent with body requirements, hasthe characteristics of no heavy metal residues, stable performance, uniform granularity, good fluidity, good palatability and the like, and can significantly improve the milk yield of the dairy cows.