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New technology using potash feldspar ore for production of potash, sodium carbonate and alumina

A technology of potassium feldspar and potassium carbonate, applied in the field of non-ferrous metal metallurgy, can solve the problems of high equipment material requirements, harsh dissolution conditions, large material flow, etc., and achieve the effects of low raw material cost, reduced waste water volume, and reduced discharge.

Active Publication Date: 2014-12-17
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

[0027] The present invention aims at the deficiencies in the above technologies, and aims at the problems of high energy consumption, large amount of slag and environmental pollution in the blast furnace smelting method and sintering method, and the low-temperature decomposition method and acid method have harsh dissolution conditions, large material flow rate, and serious impact on equipment materials. Requires high-level disadvantages, proposes an environmentally friendly new green process for the economical and rational utilization of potassium feldspar mines, reduces energy consumption and waste residues, enriches the product form of silicon, and reduces silicon-calcium slag while comprehensively recycling aluminum, potassium and sodium Quantity and by-production of construction materials such as cement

Method used

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  • New technology using potash feldspar ore for production of potash, sodium carbonate and alumina

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Potassium feldspar ore is crushed, double-rolled, and ball-milled until the particle size is below 200 mesh, accounting for 90%. Pressurize for pre-desilication, control the linear velocity of leaching and stirring to 1.7m / s, temperature at 170°C, liquid-solid ratio 3:1, time 3h, total alkali R 2 O concentration 250g / l, where Na 2 O concentration 200g / l, K 2 O concentration 50g / l. After filtering, wash with the washing water after washing the active calcium silicate. At this time, the removal rate of silicon in the slag is 42.5%. The desiliconization slag is sintered at a controlled temperature of 1300°C and a time of 0.5h at an alkali ratio of 1 and a calcium ratio of 2. Grind the clinker to less than 60 mesh, liquid-solid ratio 2:1, temperature 70°C, time 20min, carry out clinker dissolution, filter, dissolve slag slurry and wash, dry and send samples. At this time, the dissolution rate of aluminum was 86.5%, and the dissolution rate of potassium and sodium was 92...

Embodiment 2

[0061] Potassium feldspar ore is crushed, double-rolled, and ball-milled until the particle size is below 200 mesh, accounting for 95%. Desiliconization test was carried out under pressure, the leaching stirring line speed was controlled to 1.6m / s, the temperature was 180°C, the liquid-solid ratio was 4:1, the time was 3h, the total alkali R 2 O concentration 220g / l, where Na 2 O concentration 200g / l, K 2 O concentration 20g / l. After filtering, wash with the washing water after washing the active calcium silicate. At this time, the removal rate of silicon in slag is 38.6%. The desiliconization slag is sintered according to the alkali ratio of 1.05, calcium ratio of 1.95, controlled temperature of 1250°C and time of 0.5h. Grind the clinker to less than 60 meshes, dissolve the clinker at a liquid-to-solid ratio of 3:1, temperature 80°C, and time 40 minutes, filter, dissolve the slag into pulp and wash, dry and send samples. At this time, the dissolution rate of aluminum was ...

Embodiment 3

[0065] Potassium feldspar ore is crushed, double-rolled, and ball-milled until the particle size is below 200 mesh, accounting for 85%. Desiliconization test was carried out under pressure, the leaching stirring line speed was controlled to 1.6m / s, the temperature was 190°C, the liquid-solid ratio was 2:1, the time was 4h, the total alkali R 2 O concentration 240g / l, where Na 2 O concentration 200g / l, K 2 O concentration 40g / l. After filtering, wash with the washing water after washing the active calcium silicate. At this time, the removal rate of silicon in the slag is 46.6%. The desiliconization slag is sintered according to the alkali ratio of 0.95, calcium ratio of 1.9, controlled temperature of 1230°C and time of 0.5h. Grind the clinker to less than 60 meshes, dissolve the clinker at a liquid-solid ratio of 3:1, temperature 80°C, and time 40 minutes, filter, and slurry the dissolved residue, then dry and send samples. At this time, the dissolution rate of aluminum was...

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Abstract

The invention discloses a new technology using potash feldspar ore for production of potash, sodium carbonate and alumina, and a method comprising pre-desiliconization, soda-lime sintering dissolution, aluminum extraction by carbon and evaporation crystallization for separation of potassium and sodium is used for comprehensive recovery of aluminum, potassium and sodium resources. The new technology has the following advantages: the technical scheme of the new technology is reasonable, and active calcium silicate, white carbon black, sodium carbonate potassium carbonate and alumina can be produced. In carbonation decomposition process of the new technology, CO2 gas produced by sintering is used, the raw material cost is very low, and the greenhouse gas emissions can be reduced. During the sintering, the amount of a pre-desiliconization raw material is reduced by about 35%, the amount of silicon calcium slag is reduced by about 30%; desilicification slag needs no addition of sodium carbonate for raw material proportioning; washing water for washing active calcium silicate can be used for desiliconization slag washing, the amount of process water and waste water can be reduced, the silica product form can be enriched, the white carbon black and activated calcium silicate with the high added value can be outputted; by causticization regeneration of the sodium carbonate, alkali self-sufficiency and equilibrium cycle of the whole process can be realized.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a new process for producing potassium carbonate, sodium carbonate and alumina by using potassium feldspar ore. Background technique [0002] my country's water-soluble potassium resources are extremely scarce, and the main producing area is Qinghai. There are many non-water-soluble potassium resources in my country, especially the extremely rich reserves of potassium feldspar, which are mainly distributed in Yunnan, Guizhou, Sichuan, Hunan, Hubei, Henan, Anhui, Jiangxi, Shandong and Xinjiang, Heilongjiang, Shanxi, Shaanxi, Guangdong, In 19 provinces including Zhejiang, Hebei, and Inner Mongolia, the total amount is nearly 10 billion tons. At present, more than 40 sources of potassium feldspar with mining value have been explored. Among them, 19 have reserves reported, and their total reserves are more than 7.866 billion tons. Calculated based on the average gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00C01F7/14
Inventor 范艳青蒋训雄汪胜东张登高刘巍蒋伟冯林永李贺蒋飞
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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