11 results about "Sylvite" patented technology

The invention discloses a process for comprehensively utilizing sintering machine head ash, which comprises the following steps of: preparing the sintering machine head ash, oxidizing and leaching, carrying out filter pressing, and washing chlorine and dehydrating a filter cake to obtain fine iron powder; the method comprises the following steps: preparing metal cesium by replacing and recovering valuable metal from filtrate, performing primary heavy metal removal, performing secondary impurity removal, performing evaporative crystallization, crystallizing potassium chloride and sodium chloride, extracting cesium, concentrating and crystallizing a cesium chloride solution, preparing metal cesium, extracting rubidium from cesium extraction raffinate, and concentrating and crystallizing a rubidium chloride solution, thereby preparing metal rubidium; after the metal replacement powder is dissolved by a certain concentration of acid, copper, zinc, gold, silver and bismuth in the metal replacement powder are recovered step by step, and toxic and harmful elements such as thallium, chromium and cadmium are concentrated from a system. The method can comprehensively and efficiently recover sylvite, sodium salt and valuable metal in the sintering machine head dedusting ash, solves the problem that the normal production of a blast furnace is influenced by overhigh alkali metal content accumulation, and solves the environmental pollution caused by machine head ash stacking and burning.

The application discloses a method for preparing potash magnesium fertilizer by using potassium salt sylvite, and comprises the following steps: (1) adding raw materials; (2) stirring and converting by heating; (3) separating mother liquor by belt vacuum filtration and keeping warm; (4) cooling and crystallizing the mother liquor by heating; (5) ore flotation; (6) product washing and drying; and (7) tailing treatment. + , Mg 2+ , SO4 2‑ resources to a tailing pond, resulting in resource loss; or the fine crystals of bloedite are precipitated by cooling in the flotation process of the mother liquor by heating, the flotation environment is deteriorated, the concentrate quality is reduced, and filtration is difficult, so that fine treatment of resources is realized; the method is simple, the problem of difficult conversion of the potassium salt sylvite is avoided, the product quality is good, the production efficiency is high, the resource utilization rate is high, and the economic benefit is good.

The invention discloses a method and a system for producing potassium chloride from sylvite ore. The method comprises the following steps: S1, crushing the sylvite ore into ore particles with the particle size of less than or equal to 5mm and greater than or equal to 1mm; s2, conveying the ore particles into a decomposition and crystallization unit, and performing decomposition and crystallization to obtain crystallization underflow slurry and crystallization overflow; s3, the crystallizer underflow slurry is screened and classified, screen underflow and the crystallization overflow are conveyed to a thickening unit to be subjected to thickening treatment, and thick underflow is obtained; and S4, the dense underflow is conveyed into a reverse flotation unit for reverse flotation. According to the method, explosion nucleation of carnallite is avoided in the mineral decomposition process, fine grain loss is reduced, and the growth yield of potassium chloride is increased; meanwhile, a reverse flotation process is adopted, KCl crystal particles grow for a long time in a flotation device and can continuously grow in a supersaturated solution, and the yield and the taste of products are improved.

A method of manufacturing a fertilizer comprising biomass, consists in that the biomass comprising, in dry matter, simple and complex proteins in an amount from 8 to 30% by weight and phosphorus compounds in an amount from 1 to 3% by weight P2O5, is mixed with at least one carbonaceous raw material selected from the group comprising lignite, bark, sawdust, humus, compost, peat and straw in an amount of 5 to 20% by weight in relation to the biomass, is ground to a particle size of less than 5 mm to produce a pulp with a dry matter content from 10 to 70%, then the resulting pulp is mixed with at least one evaporite mineral selected from the group comprising polyhalite, calcite, dolomite, gypsum, anhydrite, carnallite, sylvite, barite, after which the whole is dehydrated to a dry matter content from 40 to 85%, then mixed with alkaline raw materials in an amount sufficient to control the temperature of the mixture in the range from 60 to 140ºC and obtain a moisture content of less than 30%, preferably 10 to 15%, and then the product obtained is granulated to obtain granules with sizes from 1 to 5 mm, and alkaline raw materials forming inorganic coatings are applied to the surface of the granules, after which a substance forming an outer coating is sprayed.

The invention relates to the technical field of carbon footprint optimization, in particular to a carbon footprint optimization device for cement kiln bypass dechlorination and sylvite extraction. An analysis and judgment module; the optimization analysis module is used for supplementing the training data based on the characteristic parameter difference degree, judging whether the data supplement mode comprises return analysis supplement or not according to the particle return deviation, and determining whether the data supplement mode comprises aggregation trend analysis supplement or not according to the crusting thickness of the preheater; the return analysis module is used for determining supplement training data based on return similarity or sylvite extraction similarity according to the return efficiency difference degree; and the gathering trend analysis module is used for supplementing training data according to the wind taking difference degree, and judging whether the risk difference degree or the smoke composition difference degree is determined according to the gathering risk mean value for supplementing or not according to the gathering risk fluctuation degree of the supplemented data. According to the invention, the accuracy of carbon emission prediction can be improved.

The present application relates to a potassium salt hot solution crystallization system, comprising a hot solution device (1) for dissolving potassium salt by high-temperature dissolving solution, a thickener (7) communicated with the hot solution device, a crystallization device (2) comprising a first-stage crystallizer (21), a second-stage crystallizer (22), a third-stage crystallizer (23) and a centrifuge (8) communicated in sequence, the first-stage crystallizer being communicated with the thickener. A low-temperature mother liquor tank (31) is communicated with the third-stage crystallizer, the centrifuge and the second-stage crystallizer cooler respectively. A second-stage hot well (32) is communicated with the second-stage crystallizer cooler and the first-stage crystallizer cooler respectively. A first-stage hot well (33) is communicated with the first-stage crystallizer cooler. A mother liquor heat exchanger (34) is communicated with the first-stage hot well and the hot solution device respectively. A cooling water device (4) is communicated with the third-stage crystallizer cooler. A steam device (5) is communicated with the mother liquor heat exchanger and the hot solution device respectively. The present application can improve the heat exchange efficiency of the system, reduce the heat energy loss and reduce the steam consumption.

The invention provides a novel solid-liquid alkali fusion synthesis kettle which comprises a kettle body, a motor, a stirring shaft and stirring blades, and further comprises at least one guide cutting plate and a plurality of tangential baffles, the tangential baffles are obliquely arranged on the inner wall of the kettle body at intervals; the guide cutting plate is fixed on the stirring shaft and faces the inner wall of the kettle body, and a local reaction area is formed between the guide cutting plate and the tangential baffle when the guide cutting plate rotates along with the stirring shaft. The reaction kettle has an efficient local reaction area, materials are continuously centrifugally thrown out, cut and mixed, the limitation of traditional frame type stirring is broken through, the contact area of solid-phase, liquid-phase and gas-phase materials is increased, and the reaction speed and the mixing uniformity are improved; the method is suitable for exothermic reaction between bulky solids such as sylvite and gas, has obvious advantages in indigo blue production, can be popularized to other similar solid-liquid-gas multiphase reaction processes, and has wide application prospects.

The invention relates to a process for preparing potassium chloride by using potassium mixed salt. The process comprises the following steps: (1) crushing and screening; (2) ore grinding and grading; (3) concentrating the slurry; (4) decomposing and crystallizing; (5) size mixing before flotation; (6) flotation; (7) filtering crude potassium; (8) washing crude potassium; (9) filtering refined potassium; and (10) drying the wet product to obtain a final potassium chloride finished product. By the adoption of the method, the defect that when the sylvinite content in the raw materials is high, due to the fact that sylvinite dissociation is insufficient, the one-time potassium recovery rate of the simple cold decomposition-flotation-washing process is low can be remarkably improved, and the overall potassium yield of the production process is effectively increased; and meanwhile, raw material over-grinding can be effectively reduced, flotation reagent consumption can be reduced, energy consumption for ore grinding and drying can be reduced, the treatment efficiency of solid-liquid separation equipment and other equipment can be improved, the product granularity can be effectively improved, and high application and popularization value is achieved.

The application provides a carnallite and a production method thereof. The production method comprises the following steps: S1, mixing E halite and F halite to obtain a carnallite slurry; S2, performing first concentration on the carnallite slurry to obtain a semi-finished carnallite slurry; S3, performing dehydration on the semi-finished carnallite slurry to obtain a crude carnallite and a semi-finished mother liquor; S4, performing second concentration on the semi-finished mother liquor to obtain a semi-finished concentrated mother liquor, and recycling the semi-finished concentrated mother liquor to continue mixing with the E halite and the F halite, and repeating the steps S1 to S3 at least once; and simultaneously, performing decomposition crystallization on the crude carnallite to obtain the carnallite. The application can promote the growth of fine-crystal carnallite in the semi-finished concentrated mother liquor, increase the particle size of the fine-crystal carnallite, thereby avoiding the problem that the fine-crystal carnallite is completely melted by fresh water due to small particle size when meeting fresh water for washing in a crystallizer, and further improving the recovery rate of the carnallite.

A pretreatment method for mixed mined potassium salt raw ore, comprising the following steps: after crushing and screening the raw ore, feeding it into a heavy medium separation device for gravity separation. The upper light product obtained by gravity separation is a slurry mainly composed of carnallite, which can enter the carnallite decomposition and crystallization operation; the bottom heavy product obtained by gravity separation is the mixed salt of sylvite / halite. The separation medium of the heavy medium separation device is an autogenous medium, which is a suspension slurry composed of mother liquor and fine particle raw ore. A low-cost gravity separation method based on density difference is used to separate carnallite from the mixed salt, so that carnallite and sylvite are preliminarily separated and then separately processed, solving the problems of low decomposition and crystallization efficiency and low overall potassium recovery rate when using the "cold decomposition crystallization - positive flotation process" to prepare potassium chloride with mixed mined potassium salt raw ore as the raw material and a high content of sylvite. This process has obvious technical advantages and application and promotion value in potassium salt mines where carnallite and sylvite are mixed mined.

The invention discloses an automatic accurate feeding and pretreatment system and method for high-activity sylvite for fluorine-containing monomer synthesis. The system comprises a pretreatment module, a feeding control module, an adaptive adjustment module and a quality feedback module. The method comprises the following steps: determining drying temperature and time through drying parameter calculation during pretreatment, and determining particle size and grinding time through grinding particle size calculation; based on reaction requirements, the total adding amount is determined through dynamic adding amount calculation, and the rate is determined through adding rate calculation; the adding opportunity is determined through reaction adaptation coefficient calculation, and the adding amount is adjusted through activity compensation calculation; the reaction state is detected in real time, and parameters are optimized through feedback correction calculation and multi-parameter coordinated adjustment calculation. After implementation, the dosage error is within + / -0.5%, the activity retention rate of the sylvite is over 97%, the product purity is stable, the waste of the sylvite is reduced, and the yield is improved.