46 results about "Nitratine" patented technology

The invention provides a method for using nitratine to produce sodium nitrate, which is characterized in that the method comprises the steps of: crushing a piece of nitratine raw ore, and sieving the raw ore to obtain nitratine ore and nitratine ore powder; adding water into the nitratine ore powder, and agitating and leaching the powder and then gaining a clear liquid by sedimentation and clarification; positioning the nitratine ore in a leaching pond, feeding a mother liquor for cold separation and / or a washing liquid, starting up a circulating pump to circulate the leaching solution, and leaching the ore under normal temperature; inputting the leaching solution to a solar pond after the leaching; heating the leaching solution to a temperature between 30 DEG C and 80 DEG C by utilizing the stored energy in the solar pond, and extracting high-temperature concentrated solution from the bottom of the solar pond after evaporation concentration; and separating out NaNO3 through crystallization by cooling. The method is applied to low grade nitratine resources, and locations of resources are areas short of water seriously and rich in solar energy resources, and the method has advantages of energy and water saving and easy realization.

The invention relates to a process for producing sodium nitrate by using nitratine reverse-flow circulation extraction, which comprises steps as follows: (1) breaking ores into the grains smaller notlarger than 5cm, (2) reverse-flow circulation leaching: after 2-6 stages of reverse-flow circulation immerge, the sodium nitrate content of extraction solution is increased from 300-380g / l to 390-500g / l, (3) separating, washing and drying at low temperature that exchanges heat between the extraction solution and low-temperature separation mother liquid, to reduce temperature, mixing and reducing temperature to -10-20DEG C, and keeping temperature for 100-140min, separating solid and liquid, filtering and washing via a saturated sodium nitrate, according to the mass ratio between product and sodium nitrate solution as 6 / 1-5 / 1, then drying to obtain sodium nitrate product, and feeding the separated mother liquid into the step (2), to process next circulation. The invention can save water more than 40%, and save energy more than 25%, while the single-process collecting rate is more than 25% and the total collecting rate of sodium nitrate in ore is more than 95.0%. The product obtained bylow-temperature separation contains sodium nitrate more than 92%, and the washed product contains sodium nitrate more than 98%. The invention can use low-grade nitratine mine to produce sodium nitrate.

The invention discloses a method of determining silver content in rock minerals. The method comprises the following steps: preparing a silver standard storage solution; preparing a silver standard solution; determining absorbance of the silver standard storage solution by using an atomic absorption spectrometer and a silver hollow cathode lamp and drawing a working curve; taking a sample; adding nitric acid, hydrochloric acid, hydrogen peroxide, an ammonium fluoride solution and a sodium chlorate solution, carrying out microwave digestion, heating and drying an obtained mixed solution with steam, adding hydrochloric acid and nitric acid, dissolving solids, transferring an obtained solution to a volumetric flask, diluting the solution with distilled water until the liquid level of the solution reaches a scale mark, shaking up the solution, determining absorbance of silver in the obtained sample solution by using the atomic absorption spectrometer and the silver hollow cathode lamp, carrying out blank tests on associated samples, and calculating the concentration of silver in the sample according to a formula. The invention has the advantages of convenience, fastness, a small usage amount of reagents, low cost for determination and no discharge of a great amount of acid gas, is favorable for protecting environment and health of operational personnel, avoids loss of the sample inthe sample solution, enables precision of analysis to be enhanced, labor intensity to be reduced, time to be saved and work efficiency to be improved, and has a wide application scope.

The invention discloses a method for detecting nitrite based on silver-coated gold nanoparticles, comprising the following steps: adding appropriate amount of HCl, AA and AgNO to the gold nanoparticles 3 , to prepare silver-coated gold nanoparticles; the glass slides were sequentially soaked in MPTMS solution, silver-coated gold nanoparticles solution, and saturated solution of naphthaleneethylenediamine hydrochloride; The solutions are mixed to form a mixed solution A; the modified glass slide is immersed in the mixed solution A, after the reaction is completed, the glass slide is washed with ultrapure water and dried, and then the light intensity of the silver-coated gold nanoparticles is observed through a dark field microscope Changes detected in nitrite levels. The method for detecting nitrite provided by the silver-coated gold nanoparticles provided by the invention has the advantages of convenience, quickness, low detection limit, high sensitivity, good selectivity, and spatial resolution ability for detection.

The invention discloses a method for preparing a rare earth vanadate film by replacement reaction, which comprises the following steps: dissolving a rare earth nitrate compound in deionized water to prepare a rare earth ion solution; placing it in a water bath at a certain temperature to obtain a spare electrode A deposition solution; a three-electrode system is formed; the three-electrode system is inserted into a spare electrodeposition solution, and a layer of electrodeposition film is deposited on the working electrode; the electrodeposition film is rinsed with deionized water and absolute ethanol respectively, and then dried to prepare The rare earth layered hydroxide film is obtained; the sodium vanadate solution is prepared, and the pH of the solution is adjusted; the sodium vanadate solution and the electrodeposited rare earth layered hydroxide film are put into a hydrothermal reaction kettle for replacement reaction; cooled to room temperature, washed , dried to obtain rare earth vanadate LnVO 4 film. The rare earth vanadate film prepared by the invention has good regularity, high adhesion, good dispersion and excellent crystallinity.

A cerium and terbium co-doped activated aluminosilicate luminescent phosphor powder and its preparation method belong to the technical field of rare earth luminescent materials, and its chemical formula representing the composition and molar composition is Ca 19.96‑ 2x al 26 Mg 3 Si 3 o 68 :0.2Ce 3+ ,xTb 3+ ,(0.2+x)A + , where A + is a charge compensator, which is Li, Na or K; x represents the number of moles doped with terbium ions, 0≤x≤0.4. The present invention synthesizes a series of fluorescent powders by a high-temperature solid-phase method, and uses corresponding oxides, hydroxides, nitrates, carbonates, etc. as raw materials when synthesizing the above products. 2 、H 2 Calcining at 1350°C-1400°C for 2-3 hours in a reducing atmosphere of a mixed gas, cooling and treating to obtain cerium and terbium co-doped activated aluminosilicate luminescent phosphors. The phosphor powder prepared by the invention has wide absorption range, high emission intensity and strong thermal stability, can be combined with ultraviolet LED chips to prepare white light LEDs with high luminous performance, and has good application prospects.

The embodiment of this specification relates to the technical field of nitrite detection, in particular to a chemiluminescent enhancer, its preparation method and its use in the detection of nitrite. Wherein, the chemiluminescence enhancer includes nano-sized rare earth fluoride, the rare earth fluoride is doped with cerium element, and the valence state of the cerium element is positive trivalent; wherein, the cerium element and the rare earth fluoride in the rare earth fluoride The rare earth elements are different elements, and the molar ratio of the cerium element to the rare earth element in the rare earth fluoride is (1:10)-(3:10). The chemiluminescence enhancer can enhance the chemiluminescence in the process of nitrite detection, thereby improving the detection effect of nitrite by chemiluminescence.