Barite processing method

1. Processing of high whiteness fine powder and ultrafine powder
The high whiteness finely pulverized barite powder is obtained by crushing, washing and whitening the barite ore. Holding the crystal structure of the mineral powder, widely used in coatings, rubber, plastics, paper, ceramics, etc., with a number of large and medium-coating plant which produce a variety of white powder paints instead of titanium, it is an excellent filler.
The process of developing and applying barite fine powder in the industrialization production of Suizhou barite company by Wuhan Institute of Management Cadre of China University of Geosciences and the Institute of Coatings Industry of the Ministry of Chemical Industry is shown in the figure below.

The Suizhou barite deposit is a sedimentary layered deposit. The results of mineral chemical analysis are: BaSO 4 94.78%, acid soluble 2.1%, Si 0.72%, organic carbon 0.56%, Ca 0.43%, Fe 0.12%, Al 0.10%. , Mg 0.17%.
After a few crushed ore to obtain a fine micron-sized raw material, the fired roaster 2.5h, clinker becomes removed alkalis, acid washed beating, sulfuric acid was added in the reaction vessel was washed with water, the aluminum powder (acid-soluble, Bleaching, stirring reaction at boiling temperature for 2.5 h, to obtain a bleaching material, washing off the soluble salts with water, pressing and drying (170 ° C) to become a finished product. The technical performance of the product meets the quality specifications of IS03262 barite b grade.
The chemical reaction process of acid reduction in the reactor is as follows:
Acid solution: dissolves impurities and colored elements with sulfuric acid.
[Fe 2 O 3 ]+3H 2 SO 4 =Fe 2 (SO 4 ) 3 +3H 2 O
[MnO]+H 2 SO 4 =MnSO 4 +H 2 O
[NiO]+H 2 SO 4 =NiSO 4 +H 2 O
Bleaching: Adding aluminum powder, generating hydrogen, reducing Fe 2+ for bleaching.
2Al+3H 2 SO 4 =Al 2 (SO 4 ) 3 +3H 2
Fe 2 (SO 4 ) 3 +H 2 =2FeSO 4 +H 2 SO 4
Among the above physical and chemical processing methods, bleaching treatment and ultrafine grinding are two key technologies. The bleaching treatment is carried out by calcination (removing carbon) and pickling (removing impurities and colored elements). Therefore, it is necessary to know the calcination temperature and time, the acid concentration, the rinsing time, the amount of the reducing agent added, and the number of times of addition and release, etc., which should be reasonably selected. Ultra-fine grinding should use high-efficiency grinding machine and reasonable selection of relevant parameters.
The Southeastern Geological Brigade of Sichuan Province applied superfine barite powder technology to process high quality barite from a certain area in Sichuan, and produced BaSO 4 ≥98%, Fe 2 O 3 ≤0.05%, ZBD whiteness ≥90%, fineness 98%. The above ultra-fine powder of ≤ 2μm, and applied in the production of paper, rubber, paint and plastic, can completely replace the precipitated barium sulfate, and the basic performance of the product is better, and the industrial application prospect is more extensive.
2. Production of strontium salt products The production of strontium salt products using barite as raw material is mainly strontium carbonate, barium chloride, barium hydroxide, barium nitrate, barium sulfate, barium titanate, in addition to lithopone ( zinc- white). Bismuth molybdate and some fine chemicals.
(1) Liede powder (zinc bismuth white) Liede powder is white powder with an average particle size of 0.3-0.5 μm. It is insoluble in water, and does not work with hydrogen sulfide and lye. It decomposes in acid solution to release hydrogen sulfide. It will change color after long-term sun exposure, but it can still restore the original color when placed in a dark place. In addition to the production of raw materials lithopone barite, there are zinc oxide, sulfate, powder coal, which is the main chemical reaction:
ZnO+H 2 SO 4 =ZnSO 4 +H 2 O
BaSO 4 +2C=BaS+2CO 2
ZnSO 4 +BaS=ZnS•BaSO 4
(2) Barium carbonate The main raw materials are barite, limestone and coal. The process flow is: barite, pulverized coal → pulverization → roasting → heating steam leaching → clarification → carbonization → adding soda ash, steam desulfurization washing → filtration → drying → packaging.
(3) Barium chloride Barium chloride is a white, shiny monoclinic crystal which loses water when heated to 113 ° C and becomes a white powder. Soluble in water, solubility increases with increasing temperature. The aqueous solution has a bitter and salty taste and is toxic to humans, animals and insects.
The main raw materials are barite, coal, hydrochloric acid or chlorine gas, calcium chloride and the like. The preparation method includes a hydrochloric acid method, a calcium chloride method, and a chlorination method. The hydrochloric acid method is obtained by reacting barite with pulverized coal after calcination and reacting with hydrochloric acid. The calcium chloride method is also firstly reduced and calcined, and then obtained by leaching, desulfurization and the like. The chlorination method is a method in which a ruthenium sulfide solution is reacted with chlorine gas to obtain a ruthenium chloride solution, which is then treated.
(4) Barium hydroxide Barium hydroxide is a white tetragonal system, soluble in hot water, and the solution is strongly alkaline. Anhydrous cesium hydroxide is a glossy white amorphous powder that is toxic.
In industrial production, the caustic soda method is mainly used, that is, it is obtained by reacting caustic soda with barium chloride solution, and evaporating, crystallizing and separating. Main chemical reactions:
BaCl 2 +2NaOH→Ba(OH) 2 +2NaCl
(5) Neodymium nitrate Cerium nitrate is a colorless or white cubic crystal, soluble in water and concentrated sulfuric acid. It decomposes at high temperature and decomposes into oxide when burned to emit green light and is toxic. It is mainly made of concentrated nitric acid and barium carbonate. It is also made of nitric acid (50%) and barium sulfide (such as Hengnan Chemical Pesticide Factory). The first grade product contains lanthanum nitrate ≥99.0%, and the second grade product ≥98.5%.
(6) Precipitated barium sulfate (barium sulfate) Barium sulfate is a white crystalline powder which is hardly soluble in water and is melted in fuming sulfuric acid and molten alkali. Easily made with mixed crystal of potassium permanganate, calcium carbonate or an alkali metal nitrate. Co-heating with carbon can be reduced to strontium sulfide.
The production method includes barite refining method and Glauber's salt- sulfurization method. The former is calcined with barite and coal powder, and then reacted with Na 2 SO 4 , and the latter is reacted with barium sulfide and thenardite. , dry, and separated.

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