(1) Mineral processing method Re-election is the most common method used in lapis lazuli dressing. The most common structural process is the process of jigging-shaker. Jigging is used to process coarse materials and shakers are used to process fine grade materials. This process structure is adopted in the celestite re-election of the Xiangyang Aijingshan antimony ore plant in Jiangsu, China. Figure 3.21.7 Flow chart of the principle of ore dressing test in Aijingshan Mine The principle course of the ore dressing test of the mine is shown in Figure 3.21.7. After the ore is crushed and crushed to less than 12mm, the granules of each group larger than 1mm are separately jigging, and each fine fraction of less than 1mm is separately selected by shaker. . The comprehensive index of re-election is: concentrate yield is 45.38%, concentrate grade (SrSo4) is 86.12%, and recovery rate is 83.31%. The middle mines of the jigging and shaker can be recovered by three methods such as magnetic separation, re-election and flotation after crushing and grinding, but the index of the flotation scheme is the best. Note that in the flotation sludge and dispersion suppressing limonite ore with Na2CO3 and Na2SiO3 after slurried, pH is preferably controlled at between 8 to 9.5, when using oleic acid as collector, the slurry temperature greater than 25 ° C. In addition, the structure of the flotation process has a greater impact on product quality. When the flotation feed is taken as 100%, the yield of flotation concentrate is 44.50%, and the concentrate grade (SrSO4) is 86.04%. 95.68%. (2) Processing technology In the processing of antimony ore, the lapis lazuli concentrate is actually processed into various strontium salts such as SrCo3, Sr(No3)2, SrCl2, and SrTiO3. However, among the many strontium salts, the most important one is SrCo3, which is not only the most widely used, but also the most widely used, and can be converted into other forms of strontium salts. The production methods of SrCo3 mainly include reduction method and metathesis method, but the former is mostly. However, the technical requirements for strontium carbonate products at home and abroad are slightly different. The reduction method is also called black ash method, that is, after high temperature roasting, SrSo4 is converted into SrCo3. The main chemical reactions are: SrSo4+2C 1300°C SrS+2CO2↑(1) SrS+NaCo3 Na2S+SrCo3↓ (2) Or: SrS+Co2 SrCo3↓+So2↑(3) The metathesis method mainly uses a soda ash or ammonium hydrogencarbonate to undergo a metathesis reaction with diatomite after calcium removal to form crude cesium carbonate. Acid-soluble, refined and then reacted with soda ash or ammonium bicarbonate to form SrCo3. Both the double decomposition method and the reduction method have their own strengths. In terms of product quality, the difference between the two is small; but in terms of cost, because the meta-decomposition process is long and requires a lot of chemical raw materials, the cost is more than 40% higher than the reduction method. This is perhaps one of the main reasons why most manufacturers choose the reduction method. The biggest advantage of the double decomposition method is that the waste liquid is easy to handle, which is not comparable to the reduction method. The pollution of sulfur-containing waste liquid in the production of reduction has attracted the attention of countries all over the world. In the past few years, the Lishui Chemical Plant in Jiangsu Province has tried to treat the ammonium sulphate waste liquid by gas stripping method, and has received good results. The foreign country replaces Na2Co3 with Co2 to carbonate the SrS refining liquid, thus avoiding the generation of sulfur-containing waste liquid. At present, there are still a number of new processes and new equipment being tested. Reducing pollution is one of the main directions in the development of the reduction method. A new method currently being tested in China is to directly convert SrSo4 into SrCo3 by means of leaching, which is extremely attractive for reducing costs and reducing pollution. The specific method is to directly leach the lapis lazuli concentrate by using a sodium carbonate solution as a leaching agent. The ore used in the test is a natural high-grade lapis lazuli ore. The ore is crushed, ground, and sieved into several grades of -65+100, -100+150, -150+200, -200+250, -250+325 mesh for testing. The content of (Ba+Ca) impurities in the sample was <1%. The leaching test was carried out in a 0.25 L flask. The leaching agent Na2Co3 concentration was 0.2 mol, the leaching time was 300 min, the temperature was 328 K, and the pH was 8-12. The results showed that the leached products were all SrCo3. This method is currently in the experimental phase. Atx Series Power Supply,Single Output Power Supply,Atx Computer Power Supply,Computer Case Atx Power Supply Dongguan O-Ray Power Supply Technology Co., Ltd , https://www.oraytek.com
Celestite: Beneficiation and processing of antimony ore
Celestite production is not aimed at obtaining high grade concentrates. Most of the world's lapis lazuli resource-owning countries have integrated the production of primary products (raw ore) with strontium- containing compounds (salt salts such as SrCo3). This determines the production of lapis lazuli and its strontium salt, including the two parts of mineral processing and strontium salt production and processing technology.