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Treatment method of waste acid, oil shale ash and white mud

A technology for oil shale ash and treatment method, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of huge equipment investment, serious energy consumption, and difficulty in meeting the requirements of continuous production, etc. problems, to achieve continuous and stable production and reduce the effect of generation

Inactive Publication Date: 2018-01-12
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The original process needs to add 40-100% NaCl of oil shale ash mass for activation, so a large amount of NaCl is needed. Although from the perspective of material balance, the original process can realize the reuse of NaCl without adding additional NaCl, but in the actual production process due to A huge amount of solid NaCl is required, and there are the following problems: relying on the method of natural sun drying, it is difficult to meet the requirements of actual continuous production; using distillation, the investment in equipment is huge, and the energy consumption is serious
[0020] It is undeniable that in the prior art, oil shale is used as a raw material, and the trivalent aluminum ions and ferric ions are not purified and separated to prepare hydrotalcite-like. The production process is simple, but the product is insufficient in the process of preparing magnetic materials show up

Method used

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  • Treatment method of waste acid, oil shale ash and white mud
  • Treatment method of waste acid, oil shale ash and white mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] step 1:

[0068] The white clay is calcined at 940°C for 0.5-6 hours under the condition of flowing air, and after cooling to room temperature, the calcined white clay A is obtained; the ratio of calcium atoms to aluminum atoms is 2:1-3:1 , mixing lime mud and oil shale ash, and calcining the mixture for 3-6 hours at 1260-1270° C. under the condition of flowing air, and cooling to room temperature to obtain mixture B;

[0069] Step 2:

[0070] Under the condition of rapid stirring, add the calcined white mud A to the waste acid with a volume of 5V, until the calcium ion concentration in the acid solution is 0.4 mol / L, distill until the volume is V, and after the distillation gas is condensed, the acid solution is obtained Q1; for the first time, add waste acid with a volume of 3V, continue to distill to 3V, add waste acid with a volume of 2V for the second time, continue to distill to a volume of 4V, and obtain distillation mother liquor Q3; merge the two additional pr...

Embodiment 2

[0088] This embodiment is basically the same as Example 1, the difference is that the ratio of the amount of calcium atoms and aluminum atoms described in step 1 is 2:1-3:1, mixing white mud and oil shale ash , the mixture is calcined for 3-6 hours at 1260-1270° C. under the condition of passing air, preferably: mixing white mud and oil shale ash according to the ratio of the amount of calcium atoms and aluminum atoms to 2.2:1, The mixture was calcined at 1260-1270°C for 6 hours under the condition of flowing air.

[0089] Example 2 Description : For calcium aluminum hydrotalcite, the ratio of the amount of calcium atoms to aluminum atoms is 2:1-3:1 is the preferred condition for the preparation of hydrotalcites, 2:1 is the first choice, because the extraction process may cause the corresponding ion ratio Small fluctuations, so it is more reasonable to choose a ratio of 2.2. At the same time, the relatively low calcium-aluminum ratio can reduce the amount of lime mud that n...

Embodiment 3

[0091] This example is basically the same as Example 1, the difference is that in step 3, add the calcined lime mud A to the distillation mother liquor Q3 until the pH value of the solution is 1-2, preferably add Calcined lime mud A until the pH value of the solution is 1.8.

[0092] Example 3 illustrates: the pH value of the solution is preferably 1.8, which can ensure that the iron ions are fully dissolved and participate in the reaction, and can also increase the processing capacity of the lime mud. If the processing ability for lime mud is further enhanced and the pH value of the solution is further increased, ferric hydroxide precipitation will be produced, which will be mixed with divalent iron, which will lead to incomplete oxidation of divalent iron.

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Abstract

The invention provides a treatment method of waste acid, oil shale ash and white mud, relates to a treatment method of industrial wastes and in particular relates to the technical field of comprehensive utilization of industrial wastes including the oil shale ash, the white mud and the waste acid and preparation of a heavy metal sewage and waste liquid treatment material. The white mud is added and is used as an additive so that the waste acid recycling effect is improved; the recycled acid is extracted through a gradient extraction method to separate a mixture of the oil shale ash and the white mud; metal ions in an extracting solution are combined to prepare magnetic hydrotalcite and hydrated calcium silicate. According to the treatment method provided by the invention, the industrial wastes are used as raw materials to prepare a high-performance adsorbent and an adsorption material can be recycled.

Description

technical field [0001] The invention relates to a treatment method for industrial waste, in particular to the technical field of comprehensive utilization of industrial waste such as oil shale ash, white mud, waste acid and preparation of sewage and waste liquid treatment materials. Background technique [0002] Three kinds of industrial waste components and their hazards [0003] 1.1 Composition and hazards of oil shale ash [0004] Oil shale has huge reserves and is generally considered to be an important alternative energy source for oil and natural gas. Due to the high ash content of oil shale, oil shale ash is the most important by-product in the process of processing and utilization. Stacking ash not only takes up a lot of land, but also causes serious environmental pollution. The main components of oil shale ash are quartz, feldspar and calcite, of which the content of quartz and feldspar is relatively high. The following table shows the chemical composition of oil...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/28B01J20/30
Inventor 张宏森宋志伟战友周思栋潘宇刘宁杜伟刘丽来李佳芮吴迪
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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