专利检索_ .从明矾石制备硫酸钾专利检索_ .从明矾石制备硫酸钾专利检索查询

序号	专利名	申请号	申请日	公开（公告）号	公开（公告）日	发明人
1	明矾石初级产品——粗钾盐的提纯方法	CN89106241.6	1989-07-24	CN1045378A	1990-09-19	张美鸽; 尹龙华; 陈国荣; 林兰生
本发明涉及到一种明矾石中的初级产品——粗钾盐的提纯方法，利用氢氧化钾与粗钾盐进行复分解置换反应，经过n次逆流置换后，硫酸钾含量从原来粗钾盐含65％左右提高到93％以上，用以提纯的KOH基本上全部变为K2SO4产品，副产物即置换反应后的母液可全部返回浸取明矾石熟料，置换反应在室温条件下进行。采用本发明加工后，钾肥的使用价值大大提高，与以往的方法比较，本工艺成本低，能耗少，可大幅度减少明矾石加工大系统的碱耗。
2	一种促进明矾石热分解提取硫酸钾的方法	CN201710194789.2	2017-03-28	CN106830015A	2017-06-13	钟怡玮; 郭占成; 高金涛; 孟龙
本发明涉及一种促进明矾石热分解提取硫酸钾的方法，涉及环保领域，属于固体废弃物处理技术和节能减排技术。该方法首先将明矾石与添加剂按配比配料后粉碎，研磨。粉料充分混合后压块或造球。然后进行焙烧，焙烧后将焙烧产物粉碎、研磨，并与水制成浆料，进行混合搅拌浸出、过滤。滤液进行蒸发浓缩结晶制取钾盐。本发明可显著降低明矾石的热分解温度和提高硫酸钾的提取率，从而提高原料利用率、降低能耗。并且可根据不同明矾石的反应性，调节添加剂的种类和加入量，以实现最佳的原料利用率和最小的尾渣排放量。
3	一种硫酸钾的提纯方法	CN89106241.6	1989-07-24	CN1015162B	1991-12-25	张美鸽; 尹龙华; 陈国荣; 林兰生
本发明涉及到一种硫酸钾盐的提纯方法，利用氢氧化钾与粗钾盐进行复分解反应，经过n次逆流反应后，硫酸钾含量从原来粗钾盐含65%左右提高到93%以上，用以提纯的KOH基本上全部变为K2SO4产品，副产物即复分解反应后的母液可全部返回浸取明矾石熟料，复分解反应在室温条件下进行。采用本发明加工后，钾肥的使用价值大大提高，与以往的方法比较，本工艺成本低，能耗少，可大幅度减少明矾石加工大系统的碱耗。
4	Method of producing alumina and potassium sulphate form alunite	US607498	1975-08-25	US3983211A	1976-09-28	Gakif Zakirovich Nasyrov; Nikolai Andreevich Kaluzhsky; Vladimir Nikolaevich Kostin
The specific feature of the present method is that in the process solution resulting in the processing of alunite with the object of producing alumina and potassium sulphate therefrom, an excess amount of sodium ions is maintained with respect to the potassium ions.The method is advantageous in that it ensures a higher yield of potassium sulphate and a lower contamination of the final products with respect to sodium and potassium ions.
5	Process of producing potassium sulphate, ammonia sulphate, and alumina from alunite	US32995029	1929-01-02	US1850038A	1932-03-15	HIROMU TANAKA

6	Method of producing potassium sulfate and aluminum oxid from alunite or similar material	US34190419	1919-12-02	US1386031A	1921-08-02	SILSBEE JOSEPH L

7	Recovery of alumina values from alunite ore	US641020	1984-08-15	US4618480A	1986-10-21	Wayne W. Hazen; David L. Thompson; James E. Reynolds; Nicholas J. Lombardo; Paul B. Queneau; John P. Hager
A novel process for the recovery of alumina and potassium sulfate from alunite is provided comprising leaching the alunite with potassium hydroxide to which no sodium materials have been added, said leach solution being saturated with potassium sulfate. Aluminum values are solubilized into the leachate, and potassium and sulfur values are rendered soluble, but remain in the residue. The leachate is desilicated if necessary, preferably with lime, and aluminum trihydroxide is precipitated therefrom, followed by calcining to alumina product. The residue is leached to solubilize potassium sulfate in a secondary leach and the potassium sulfate product crystallized therefrom. Potassium hydroxide is regenerated from a portion of the potassium sulfate secondary leachate by several methods.Novel procedures for regenerating alkali metal hydroxides from the corresponding sulfates are also provided including routes involving formates and carbonates as intermediates and pyrohydrolysis.
8	Process for reduction of alunite ore in aluminum recovery process	US801054	1977-05-27	US4093700A	1978-06-06	Kent W. Loest; George H. Kesler
The invention is an improvement in the method for recovering aluminum values from alunite ore by roasting the ore to remove water, reducing the ore by roasting it in a reducing atmosphere to remove sulfate, optionally roasting the reduced ore in an oxidizing atmosphere to convert any sulfides formed in the second roast to oxides, leaching the calcined ore with water as a solvent to remove compounds of sulfur and alkali metals, recovering aluminum values as soluble aluminates from the residue from the leaching step by digesting it with at least one alkali metal hydroxide, removing contaminate silica from the resulting leach solution, and precipitating aluminum hydroxide from the solution, the improvement being the use of a two stage reduction of the dehydrated alunite ore, in which the ore is reduced by sulfur in the first stage, followed by a second stage reduction with another reducing agent such as hydrogen.
9	Process for recovering aluminum from alunite ore	US728215	1976-09-30	US4064217A	1977-12-20	George J. Hartman; Michael G. Darland
An improvement in the process for recovering aluminum from alunite ore disclosed in U.S. Pat. Nos. 3,890,425 and 3,890,426, the improvement being in the recovery of potassium sulfate by crystallization from the leaching solution resulting from potassium hydroxide leaching of the roasted ore, the improvement consisting of adding potassium hydroxide to the concentrated leach liquor prior to crystallization to increase the concentration of the potassium ion so that increased recoveries of potassium sulfate are obtained at a given temperature over those obtained when this procedure is not used. By this procedure a yield is obtained at a temperature below that which is required to obtain the same yield when potassium hydroxide is not used so that the high temperatures formerly necessary to hold enough potassium sulfate in solution for an economic crystallization are avoided. The improvement is particularly adapted to the process of the patents using potassium hydroxide as the leaching agent and in which the mother liquor is recycled to the leach as potassium hydroxide in an amount up to that required for the leaching step can be added in the crystallization step so that the potassium hydroxide serves both as a crystallization aid and as a leachant.
10	Method of producing pure alumina from alunite	US87775	1979-10-24	US4331636A	1982-05-25	Jason Svoronos
Pure alumina (Al.sub.2 O.sub.3) is recovered from alunite (Al.sub.2 (SO.sub.4).sub.3.K.sub.2 SO.sub.4.4 Al (OH).sub.3) which is found mixed with various impurities by first calcinating the alunite in the presence of a chloride to produce impure Al.sub.2 O.sub.3 and other biproducts, and the impure Al.sub.2 O.sub.3 is then contacted with concentrated HCl to produce, after concentration and crystallization, crystals of AlCl.sub.3.6H.sub.2 O. These crystals are then calcinated to yield highly concentrated HCl and pure alumina.
11	Recovery of aluminum from alunite ore using acid leach to purify the residue for bayer leach	US669621	1976-03-24	US4031182A	1977-06-21	Kent W. Loest
A process for recovering aluminum from alunite ore directed to providing a residue for the Bayer leach step substantially free of impurities so that a high A/C ratio Bayer leach liquor is produced, which comprises roasting the ore in particulate form to drive off water and sulfur as SO.sub.2 and to convert aluminum sulfate to alumina, leaching the residue containing aluminum values with water and filtering to remove potassium sulfate and other soluble sulfates, hot leaching the residue with sulfuric acid to convert the alumina therein to soluble aluminum sulfate followed by filtering to remove silicon dioxide and other solid impurities, crystallizing the aluminum sulfate to further remove impurities, heating the residue to convert the aluminum sulfate to alumina and drive off any remaining sulfur as SO.sub.2, and digesting the alumina calcine with sodium hydroxide under standard Bayer conditions at a high A/C ratio to provide a high A/C ratio solution from which a "sandy" aluminum hydroxide is precipitated.
12	Process for recovering aluminum from alunite	US582806	1975-06-02	US3996334A	1976-12-07	George J. Hartman; Vernon R. Ewing
An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a final leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing therein an ion exchange procedure in which potassium hydroxide for the first leaching step is produced through ion exchange by use of potassium sulfate and sodium hydroxide, a further improvement being the use of the desilication product as the ion exchange agent.
13	Method for dehydrating ores	US608557	1975-08-28	US3996333A	1976-12-07	Philip M. Rooke; Harry B. Scott; Peter A. Angevine; Stanley A. Bunk
A method for dehydrating alunite ore prior to further processing to recover metals therefrom, comprising exposing the ore in particulate form to burning coal as the heat supply in a fluidized bed fluidized with an oxygen containing gas. The invention is illustrated by the removal of water from alunite ore prior to further processing the ore to recover aluminum.
14	Process for alum cracking and the so obtained products	US3679361D	1970-01-21	US3679361A	1972-07-25	BONELLI GIOVANNI
A MOLTEN ALUM, IS SUBJECTED TO DEHYDRATION AT A TEMPERATURE OF 95-300C.-WHICH CAN POSSIBLY BE GRADUATED IN DIFFERENT PERCENTAGES-AND CALCINATION, EITHER IN THE SAME APPARATUS OR IN TWO DIFFERENT APPARATURSES, THAT IS IN A DEHYDRATING AND CALCINATING APPARATUS RESPECTIVELY; CARRYING OUT THE OPERATIONS PREFERABLY IN A FLUIDIZED BED FURNACE AND AT A CALCINATION TEMPERATURE IN A RANGE OF 575C.-1200*C. SULPHUR DIOXIDE-FROM WHICH SULPHURIC ACID IS SUCCESSIVELY PREPARED-ALUMINA AND ALKALI SULPHATES ARE OBTAINED THROUGH THE ALUM CRACKING THUS EFFECTED.

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