15results about "Double sulfate preparation" patented technology

The invention belongs to the technical field of chemical fertilizer production and livestock feed, and particularly relates to a combined preparation method of water-soluble potassium sulfate and feed-grade potash magnesium sulphate fertilizer. According to the method, the picromerite concentrate wet material is taken as an initial raw material, the picromerite concentrate wet material with relatively low potassium and magnesium content is purified into high-grade potassium sulfate and the potash magnesium sulphate fertilizer by utilizing hot melt mother liquor at different mother liquor points through multi-stage hot melt and multi-stage vacuum evaporative crystallization, so that efficient distribution and conversion of potassium and magnesium elements in the raw material are realized, resource waste is avoided, and the production cost is reduced. The comprehensive utilization rate of raw materials is greatly improved. Two high-added-value products, namely the water-soluble potassium sulfate and the feed-grade potassium-magnesium fertilizer, are prepared at the same time, and the blank of combined preparation of raw materials required by agriculture and animal husbandry is filled.

The present disclosure relates to a method of carbon dioxide mineralisation, the method comprising: treating a material, such as a mineral, with carbon dioxide and a base, wherein the treatment occurs in solution phase, the material comprising: a first cation that is Ca or Mg; a second cation which is not Ca and or Mg; and one or more anions which are not carbonate; such that a product solution comprising an acid or a salt of the base and one of the one or more anions and a salt of the second cation and one of the one or more anions is formed, and a carbonate salt of the first cation is caused to precipitate.

The present invention discloses a method for producing magnesium sulfate monohydrate and potassium magnesium sulfate fertilizer by producing bittern from seawater. The present invention is directed to the bittern component of seawater and combines Na + , K + Mg 2+ 、Cl ‑ 、SO4 2‑ The invention realizes the comprehensive utilization of seawater salt brine and the simultaneous preparation of magnesium sulfate monohydrate and potassium magnesium sulfate fertilizer. In addition, K in seawater salt brine is used to produce magnesium sulfate monohydrate and potassium magnesium sulfate fertilizer. + Mg 2+ and SO4 2‑ The recovery rates were all above 80%.

A method for preparing potassium magnesium alum by using underground primary sulfur-rich potassium-containing minerals in a high-temperature state comprises the following steps: S1, performing multi-stage crushing on raw ores to obtain the sulfur-rich potassium-containing minerals; s2, sulfur-rich potassium-containing minerals and seawater are mixed and then stirred, the stirring time is 40-150 min, the conversion temperature is controlled to be 35-50 DEG C, and solid-liquid mixed ore pulp is obtained; s3, the solid-liquid mixed ore pulp is subjected to pulp mixing with a potassium magnesium alum flotation mother solution to control the flotation concentration, flotation is conducted after a flotation reagent is added and mixed to be uniform, the dosage of the flotation reagent is 250-500 g / ton raw ore, and the flotation reagent is an organic sodium salt aqueous solution generated after heavy oil is subjected to chlorination, sulfonation and saponification; and S4, flotation froth obtained in flotation is filtered and separated, solids are potassium magnesium alum concentrates, after tailings are concentrated, obtained high-concentration tailings are discharged, and flotation mother liquor generated through flotation filtration or concentration is partially returned to the step S3 to be used for size mixing. The method is simple in process and good in product quality.

The invention provides refined magnesium sodium sulfate prepared by roasting serpentine tailings mixed with an auxiliary agent and a preparation method, and the preparation method comprises the following steps: proportioning serpentine tailings powder and a reaction auxiliary agent, and then putting the mixture into a high-temperature roasting furnace for roasting treatment to obtain a roasted product; the roasted product is placed in a reactor containing a leaching solution to be subjected to leaching treatment, and turbid liquid containing magnesium sodium sulfate is obtained; filtering the turbid liquid to obtain a refined magnesium sulfate sodium solution; and carrying out evaporative crystallization on the refined magnesium sodium sulfate solution to obtain refined magnesium sodium sulfate. The purity of the refined magnesium sulfate sodium ranges from 98.889% to 99.995%. According to the preparation method, the magnesium ion leaching rate reaches 70.0%-90.0%, the iron ion leaching rate is controlled to be 0.1%-1.5%, the purpose of treating waste with waste is achieved, the problems of land occupation and pollution caused by open-air accumulation of the two kinds of waste residues are solved from the source, the solid waste stockpiling environmental risk is reduced, and the concept of circular economy and green development is met.

A method for removing alkaline earth metals from a filtrate comprises a first crystallization step and a second crystallization step wherein the first crystallization step is a forced circulation crystallizer and wherein the second crystallization step is a draft tube crystallizer. Also included is a method for reducing magnesium in a chemical liquid, comprising crystallizing magnesium into magnesium sulfate hydrate in a first crystallization step, and precipitating magnesium by adding a caustic material in a chemical precipitation step.

The present invention relates to a method for chemical demagnesing of phosphate rock, and belongs to the field of phosphorus chemical technology. The technical problem solved by the present invention is to provide a new method for chemical demagnesing of phosphate rock. The method comprises the following steps: adding an acid solution to the phosphate rock slurry, and then separating the solid and liquid. After the liquid is mixed with a removal agent such as an ion exchange resin or an extractant for reaction, the removal agent is regenerated by a specific method and a by-product is obtained. The method of the present invention is applicable to phosphate rock of any grade and has a wide range of applications. The magnesium element in magnesium-containing phosphate rock is removed by a chemical method, and the removal rate is high, the energy consumption is low, and the process flow is simple. The magnesium ions can be subjected to high-value treatment to obtain products such as ammonium magnesium sulfate, sodium magnesium sulfate, potassium magnesium sulfate or magnesium hydroxide. The product has high purity, the ion exchange resin used has little loss, and can be recycled. The generated demagnesing waste liquid and acid / alkaline regeneration filtrate can be recycled, which not only saves water resources, but also avoids the pollution to the environment caused by sewage discharge, and meets the development concept of green development.

Described herein is a process for the production of potassium sulfate and ammonium sulfate from syngenite. Specifically, the syngenite is produced from waste liquors and low value minerals and is used to produce valuable secondary products. Specifically, instead of performing the decomposition reaction in one step at high temperature, this process performs the reaction in 2 steps at temperatures lower than the decomposition temperature of ammonium bicarbonate: a first step to reach the equilibrium and produce saturated potassium sulfate brine, and a second step to complete the syngenite decomposition reaction.

The invention discloses a method for preparing picromerite-containing mixed salt from sulfate type salt lake polyhalite, which comprises the following steps: step 1, dissolving NaCl + MgSO4 mixed salt obtained in a salt pan evaporation process of sulfate type salt lake brine in water to obtain a leaching agent; step 2, crushing and crushing the sulfate type salt lake shallow polyhalite ore; 3, the crushed polyhalite ore and a leaching agent are stirred and leached, and slurry is obtained; step 4, filtering the infiltrated slurry to obtain an infiltrating solution; and 5, the leaching solution obtained in the step 4 is naturally evaporated, the leaching solution is subjected to three evaporative crystallization stages of NaCl + CaSO4, NaCl and picromerite-containing mixed salt, the picromerite-containing mixed salt is finally obtained, the picromerite-containing mixed salt comprises NaCl and picromerite, the content of the picromerite is 25.0-40.0 wt%, and the content of the NaCl is 50.0-65.0 wt%. According to the method, potassium and magnesium resources in the polyhalite ore are fully utilized, sources of raw materials of the leaching agent are increased, and the yield of potassium and magnesium valuable elements in the polyhalite ore is increased.

The invention belongs to the technical field of livestock feeds, and particularly relates to a preparation method of a feed-grade potash magnesium sulphate fertilizer. According to the preparation method, picromerite concentrate is used as a preparation raw material, and meanwhile flotation tail liquid and / or crystallization mother liquid are / is used as a size mixing solution; the feed-grade potash magnesium sulphate fertilizer is obtained through size mixing, hot melting, heat preservation sedimentation, three-stage vacuum crystallization, solid-liquid separation and drying in sequence. The preparation method provided by the invention has the advantages of stable product quality and high purity, and meanwhile, the picromerite concentrate, the crystallization mother liquor and the flotation tail liquid are combined for use, so that the feed-grade potash magnesium sulphate fertilizer product is obtained, and the requirement of the market on the high-quality feed-grade potash magnesium sulphate fertilizer can be met.

The invention relates to a picromerite surface topography regulation and control method and application of the picromerite surface topography regulation and control method in picromerite flotation. The picromerite particles are added into a solution for ultrasonic pretreatment, so that a large number of cracks and pits are generated on the surfaces of the picromerite particles, and the specific surface area and adsorption sites of the picromerite particles are increased; and then mixing the picromerite particles subjected to ultrasonic pretreatment with a saturated picromerite solution and a collecting agent for flotation, filtering flotation concentrate, and fully drying to obtain picromerite with higher purity. According to the method, the recovery rate of picromerite can be remarkably increased under the conditions that original flotation equipment is not changed and the variety and number of collecting agents are not increased, and therefore the method has important significance in the aspects of comprehensive utilization of sylvite resources, green flotation process popularization, improvement of the self-sufficiency rate of potash fertilizer in China and the like.

The invention discloses a method and a device for producing a full-water-soluble potash magnesium sulphate fertilizer by using a potassium chloride byproduct. The method and the device provided by the invention realize three breakthroughs of solid waste recycling, environment-friendly zero emission and high-quality synergism. Solid wastes such as potassium chloride by-products, potassium sulfate mother liquor and the like are used as raw materials, the utilization rate reaches 90% after precise blending and multi-stage treatment, and the problems of solid waste accumulation and permeation pollution are thoroughly solved. Cooling mother liquor is subjected to raw material blending after 85-95% of reheating solution and 5-15% of dechlorination, 5-10% of fresh water is added for impurity control, and no waste water is discharged in the whole process; scavenged tailings are treated in a standard reaching manner, and secondary pollution is avoided. The product Cl is less than or equal to 0.5%, the water insoluble substance is less than or equal to 0.1%, the water solubility is more than or equal to 99%, and the product is suitable for high- Microwave hot melting replaces steam heating, so that energy consumption is reduced; and mother liquor circulation reduces fresh water consumption, and the cost is reduced by sectional low-dosage addition of the collecting agent. Various waste salt mother liquor can be treated, complex pretreatment is not needed, residual potassium-sulfur mixed salt is recycled in a scavenging and agent-free mode, tailings K is smaller than or equal to 0.2%, and the total potassium yield is larger than or equal to 90%. In conclusion, environmental protection, quality and benefit are improved, and the industrialization prospect is remarkable.

A process for the complete material utilization of polymineralic hard salts with a high clay content by hot leaching of the chloride minerals, including sodium chloride, and the soluble sulfate minerals with water for several hours. This yields a KCl-MgSO4-NaCl solution and, by solid-liquid separation, a solvent residue consisting of sulfate and clay minerals. After drying and calcination, the solvent residue produces a clay-containing, chloride-free K-Mg-Ca-SO4 fertilizer granulate with soil-improving properties. Magnesium chloride solution is generated as a byproduct and can be used as a raw material for magnesium as well as for magnesium compounds such as MgCl2·6H2O and Mg(OH)2, which can be produced using known methods.

The invention discloses a natural evaporation process method for adsorbing lithium extraction tail liquid by using magnesium sulfate subtype brine, which comprises the following steps: 1) adsorbing and extracting lithium by using the magnesium sulfate subtype brine to generate the lithium extraction tail liquid; (2) evaporating and dehydrating the lithium extraction tail liquid, and extracting potassium mixed salt from the dehydrated lithium extraction tail liquid when the epsomite is saturated, so as to separate out potassium mixed salt ore; and 3) continuously evaporating and dehydrating the brine from which the potassium mixed salt is extracted so as to separate out carnallite. The natural evaporation process method disclosed by the invention is simple in process control and low in production cost, is suitable for large-scale evaporation mineralization operation of the sodium-brine-removal adsorption lithium-extraction tail liquid in the salt pan, and is particularly suitable for salt pan production of magnesium sulfate subtype salt lake brine.

The present invention provides carbonation methods for treating industrial byproduct streams comprising sodium sulfate with one or more carbonation reagents, including but not limited to (i) potassium bicarbonate and / or potassium carbonate; or (ii) carbon dioxide (CO2) and a potassium salt, thereby producing (i) a solid phase comprising one or more potassium sulfate salts and (ii) a liquid phase comprising carbonic acid salts in solution. The one or more potassium sulfate salts comprise potassium sulfate (K2SO4), glaserite, or other sodium potassium sulfate salts. The carbonic acid salts comprise sodium carbonate (Na2CO3) and / or sodium bicarbonate (NaHCO3). The present invention also provides processes for isolating the aforementioned salts from industrial byproduct streams. The present invention also provides cyclical processes for recovering and recycling reagents for producing the aforementioned salts from the industrial byproduct streams and from product streams containing the aforementioned salts.