40results about "Double sulfate preparation" patented technology

The present invention provides process of preparing potassium sulfate with potassium containing subtype magnesium sulfate bittern. The process includes naturally evaporating potassium containing subtype magnesium sulfate bittern from salt lake to crystallize and separate out potassium containing sulfate and sulfate radical containing carnallite successively; grinding the potassium containing sulfate, decomposing to convert and floating to obtain picromerite; decomposing sulfate radical containing carnallite to convert and floating to obtain coarse potassium chloride; mixing picromerite, coarse potassium chloride and potassium sulfate mother liquid to obtain slurry, washing, filtering, decomposing to convert and filtering separation to obtain potassium sulfate. The present invention has low production cost, high yield and high product quality.

Methods of processing an aqueous solution comprising potassium sulfate and magnesium sulfate include crystallizing K2SO4, crystallizing recycle crystals, and mixing at least a portion of the recycle crystals with the aqueous solution. Systems for processing potassium sulfate and magnesium sulfate include a first crystallizer and a second crystallizer in fluid communication with the second mix tank. The second crystallizer is structured and adapted to precipitate recycle crystals from the concentrated liquor to form a potassium-depleted recycle brine. The recycle crystals precipitated in the second crystallizer have a composition suitable to be recycled to the first crystallizer to increase the production of SOP.

The invention provides a method for producing potassium sulfate by using sulfate-type salt lake brine resources. The method comprises the following steps: drying the sulfate-type salt lake brine in a salt field to obtain sodium chloride, soft potassium and magnesium Sulfate mixed salt ore of vanadium, magnesium sulfate and potassium chloride and potassium salt mixed salt ore mainly containing sodium chloride, potassium chloride, magnesium sulfate and carnallite; after mixing these two kinds of ores, they are mixed with The water is converted to produce coarse langbeinite mixed ore. The mixed ore is selected through the flotation process to select the langbeinite mixed salt concentrate, and then add water to the high-grade langbeinite mixed salt concentrate to decompose directly. Potassium sulfate product can be obtained; its tailings can be used as industrial salt after being washed with water; compared with the existing similar process, the present invention removes the grinding process with large power consumption, and the whole process does not add potassium chloride, saving Energy saving, cost reduction, simple process, normal temperature and pressure operation, strong adaptability to different grades of raw material ores, and good product purity and whiteness.

A method is disclosed for production of a sulfate-containing chlorine free salt and anhydrous gaseous HCl from a metal chloride (MClx), oleum and water. MClx and oleum are mixed together with a water-containing liquid, forming gaseous HCl and a solution of a sulfate-containing salt. The salt is precipitated from the solution, and in a preferred embodiment, the supernatant liquid from the precipitation is recycled to the reaction mixture as the water-containing liquid in subsequent reaction cycles. The exothermicity of the reaction between the water-containing liquid and the oleum is sufficient to remove chlorine in the form of substantially pure useful HCl and enables the process to proceed without additional heating of the reaction mixture. When the metal is potassium, this method produces high-purity novel sulfate salts with high potassium content K3(NH4)(SO4)2, 3K2SO4.MgSO4 and 3K2SO4.CanMg1-nSO4.

The invention relates to picromerite feed and a preparation method thereof. The preparation method includes the steps of S1, preparing materials, to be specific, collecting solarized carnallite from asalt lake and tail salt discharged to a tailings dam during production to provide materials for preparation of picromerite; S2, converting, to be specific, mixing the carnallite and tail salt in a mass ratio of 1.86, and converting under the water addition of 49.8% and the temperature of 25 DEG C for 90 min to obtain a solid phase converted from the mixture, wherein the solid phase mainly includes sodium chloride and picromerite. Carnallite of a salt lake and tail salt from production process are used to prepare picromerite herein; picromerite with the potassium yield of 54.9% can be attained; the picromerite prepared with the carnallite of the salt lake and the tail salt from the production process can be applied to feeds, thereby preventing fed animals from lacking potassium and experiencing muscular weakness, heart failure and respiratory failure; the problem is solved that picromerite prepared in the prior art has poor quality and causes insufficient potassium content to feeds, and therefore, normal growth of animals is affected.

The invention discloses a preparation method of anhydrous magnesium chloride, which comprises the following steps: reacting anhydrous magnesium formate powder with anhydrous hydrogen chloride gas in an anhydrous organic solvent to generate anhydrous magnesium chloride and formic acid, and removing the anhydrous organic solvent and formic acid to obtain anhydrous magnesium chloride, wherein the anhydrous magnesium formate powder is suspended in the anhydrous organic solvent, and the anhydrous hydrogen chloride gas is dissolved in the anhydrous organic solvent. The anhydrous magnesium chloride with extremely high quality can be obtained by the method disclosed by the invention.

The invention relates to a recovery and treatment method of waste sulfuric acid, comprising S1: performing defluorination pretreatment on waste sulfuric acid; S2: transferring waste sulfuric acid to a reaction kettle, adding magnesium oxide for reaction; S3: performing pressure filtration on the reaction solution, and transferring the waste residue to Waste residue storage tank, the filtrate is transferred to activated carbon filtration equipment; S4: The mother liquor of magnesium sulfate is separated from the first crystallization tank to detect the content of potassium bisulfate. According to whether the content of potassium bisulfate in the mother liquor reaches the predetermined threshold, it is decided whether the mother liquor should continue to circulate or recover sulfuric acid Potassium hydrogen is recycled. The method and device of the present invention can realize the recovery of potassium hydrogensulfate in waste sulfuric acid, and through the circular purification of the mother liquor, when the concentration of potassium hydrogensulfate in the mother liquor does not reach the threshold value, the mother liquor is returned to the reactor to continue to increase the potassium hydrogensulfate of the mother liquor Concentration, when the concentration of potassium bisulfate in the mother liquor reaches the threshold, the mother liquor is transferred to the crystallization tank, magnesium oxide is added to generate potassium magnesium sulfate and the material is separated and discharged, realizing the low-cost recovery of potassium bisulfate in waste sulfuric acid.

According to some embodiments there is provided a process for the recovery of SOP from Sulphate bearing mineral and Carnallite or Sylvenite, comprising: Dissolving Carnallite in water to obtain Sylvenite and high Magnesium Chloride brine; Adding Sodium Sulphate to said Carnallite to produce mixture of Kainte\Leonite, KCl and NaCl precipitant and brine containing Mg Cl2, KCl, NaCl; Separating the NaCl from the mixture; Obtaining a precipitant mixture of Leonite with KCl; Filtering said Leonite and washing with water to yield pure mixture of Leonite with KCl; Adding KCl to the Leonite with the KCl; and Decompose said Leonite with the KCl to SOP.

The invention relates to a method for preparing a large-particle picromerite from picromerite crude product. The method comprises the following steps: taking picromerite crude product gained through flotation as raw materials, and through a crystal transformation step of reducing the temperature from 50-70 DEG C to 20-30 DEG C, enabling compound leonite with four crystal water (or langbeinite without crystal water) to be changed into compound picromerite with six crystal water. The particle diameter of the prepared large particle picromerite can reach 620.5 micrometers to the maximal extent, the problem that fine particle picromerite is not easy to separate and dry and easy to agglomerate is solved, and meanwhile the potassium ion recovery ratio in the technology can reach above 80 %.

A method is disclosed for production of a sulfate-containing salt and anhydrous gaseous HCl from a metal chloride (MClx) and oleum. MClx and oleum are mixed together with a water-containing liquid, forming gaseous HCl and a solution of a sulfate-containing salt or double salt. The salt is precipitated from the solution, and in a preferred embodiment, the supernatant liquid from the precipitation is recycled to the reaction mixture as the water-containing liquid in subsequent reaction cycles. In a preferred embodiment, HCl discharged from the reaction mixture is scrubbed to remove dust, water vapor and traces of H2SO4, yielding anhydrous HCl of >90% purity. The exothermicity of the reaction between the water-containing liquid and the oleum is sufficient that, unlike methods known in the prior art, the process proceeds quickly and efficiently without any necessity for additional heating of the reaction mixture. This method provides high-purity, low-chlorine sulfates, including the novel potassium sulfate double salts K3(NH4)(SO4)2, 3K2SO4.MgSO4 and 3K2SO4.CanMg1-nSO4.

The invention relates to a method for recycling waste sulfuric acid. The method comprises the following steps: S1, carrying out defluorination pretreatment on waste sulfuric acid; S2, transferring thewaste sulfuric acid into a reaction kettle, and adding magnesium oxide for reaction; S3, carrying out filter pressing on a reaction liquid, transferring waste residues to a waste residue storage tank, and transferring filtrate to activated carbon filtering equipment; and S4, separating a magnesium sulfate mother liquor through a first crystallization kettle, detecting the content of potassium hydrogen sulfate, and determining whether the mother liquor is continuously circulated or recycled after potassium hydrogen sulfate is recycled according to whether the content of potassium hydrogen sulfate in the mother liquor reaches a preset threshold value or not. According to the method and the device, the recovery of potassium hydrogen sulfate in the waste sulfuric acid can be realized; the mother liquor is circularly purified, when the concentration of potassium hydrogen sulfate in the mother liquor does not reach a threshold value, the mother liquor flows back to the reaction kettle to continue to increase the concentration of potassium hydrogen sulfate in the mother liquor, and when the concentration of potassium hydrogen sulfate in the mother liquor reaches the threshold value, themother liquor is transferred to the crystallization kettle, the magnesium oxide is added, potassium magnesium sulfate is generated, separated and discharged, and the low-cost recovery of potassium hydrogen sulfate in the waste sulfuric acid is achieved.

The invention relates to a preparation method of large-particle potassium magnesium sulfate crystals and small-particle potassium magnesium sulfate crystals. The preparation method includes followingsteps: 1), preparing a hot potassium hydrogen sulfate solution of 25-65wt% in concentration; 2), slowly adding the potassium hydrogen sulfate solution in the step 1) into magnesia or magnesium hydroxide for neutralizing, and holding temperature to obtain hot mixed liquid, wherein the end point of neutralizing is when pH is 6-8; 3), performing solid-liquid separation on the mixed liquid to obtain small-particle potassium sulfate crystals and primary filtrate; 4), performing cooling crystallization and solid-liquid separation on the primary filtrate to obtain large-particle potassium magnesium sulfate crystals and secondary filtrate. Preparation of the large-particle potassium magnesium sulfate crystals is realized by controlling concentration of raw materials and determination of the end point of neutralizing, high-quality potassium magnesium sulfate with granularity reaching 2-4.75mm can be obtained directly, and cost for granulation is reduced.

The invention provides a method for preparing picromerite from a mixed salt. According to the method for preparing the picromerite from the mixed salt, by using the mixed salt as a raw material and using appropriate ion composition in the mixed salt, the picromerite is prepared through transformation and screening processes; problems that the energy consumption is high, the floor space is large, the production efficiency is low, a flotation agent is easily mixed in a product and so on in the prior art are solved; and meanwhile, the potassium ion recovery rate of the process can reach 68% or above; and the production of each ton of picromerite only consumes 2.5-3.5 tons of mixed salts. The mixed salt comprises the components of 9.38-10.38% of K<+>, 7.62-8.62% of Mg<2+>, 6.16-7.16% of Na<+>,29.02-30.02% of SO4<2->, 21.00-31.00% of Cl<-> and 23.83-24.83% of H2O according to the weight percentage.

The invention relates to a method for treating a salt solution (1) using a treatment system (100). The treatment system (100) has an evaporation device (10) to which the salt solution (1) produced ina preliminary process is supplied. A crystallizate suspension (11) having kainite, halite, and sylvite is obtained from the evaporation device (10), and the kainite is then separated from the crystallizate suspension (11). The method for separating the kainite from the crystallizate suspension (11) has at least the following steps: - supplying the crystallizate suspension (11) to a pre-grading device (12) in which kainite is partly separated from the crystallizate suspension (11) by means of a pre-separation process based on the particle size of the kainite, thereby obtaining a kainite-reducedfraction (13), and transferring the kainite-reduced fraction (13) to a flotation device (14) in which the remaining content of kainite is separated from the kainite-reduced fraction (13).

A method for producing a double sulfate of potassium and magnesium by dry mechanical attrition of potassium sulfate and magnesium sulfate hexahydrate, comprising obtaining potassium sulfate by sulfatation of potash to bisulfate of potassium and disproportionation of the bisulfate of potassium to potassium sulfate in a water-methanol solution, and obtaining magnesium sulfate hexahydrate by sonic-assisted partial sulfatation of calcined serpentinic silicate.