7results 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 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.

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 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 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.